diff options
Diffstat (limited to 'arch/metag/kernel')
35 files changed, 0 insertions, 7495 deletions
diff --git a/arch/metag/kernel/.gitignore b/arch/metag/kernel/.gitignore deleted file mode 100644 index c5f676c3c224..000000000000 --- a/arch/metag/kernel/.gitignore +++ /dev/null @@ -1 +0,0 @@ -vmlinux.lds diff --git a/arch/metag/kernel/Makefile b/arch/metag/kernel/Makefile deleted file mode 100644 index 73441d8c0369..000000000000 --- a/arch/metag/kernel/Makefile +++ /dev/null @@ -1,40 +0,0 @@ -# SPDX-License-Identifier: GPL-2.0 -# -# Makefile for the Linux/Meta kernel. -# - -extra-y += head.o -extra-y += vmlinux.lds - -obj-y += cachepart.o -obj-y += clock.o -obj-y += core_reg.o -obj-y += devtree.o -obj-y += dma.o -obj-y += irq.o -obj-y += kick.o -obj-y += machines.o -obj-y += process.o -obj-y += ptrace.o -obj-y += setup.o -obj-y += signal.o -obj-y += stacktrace.o -obj-y += sys_metag.o -obj-y += tbiunexp.o -obj-y += time.o -obj-y += topology.o -obj-y += traps.o -obj-y += user_gateway.o - -obj-$(CONFIG_PERF_EVENTS) += perf/ - -obj-$(CONFIG_METAG_COREMEM) += coremem.o -obj-$(CONFIG_METAG_DA) += da.o -obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o -obj-$(CONFIG_FUNCTION_TRACER) += ftrace_stub.o -obj-$(CONFIG_MODULES) += metag_ksyms.o -obj-$(CONFIG_MODULES) += module.o -obj-$(CONFIG_PERF_EVENTS) += perf_callchain.o -obj-$(CONFIG_SMP) += smp.o -obj-$(CONFIG_METAG_SUSPEND_MEM) += suspend.o -obj-$(CONFIG_METAG_USER_TCM) += tcm.o diff --git a/arch/metag/kernel/asm-offsets.c b/arch/metag/kernel/asm-offsets.c deleted file mode 100644 index d9b348b99ff2..000000000000 --- a/arch/metag/kernel/asm-offsets.c +++ /dev/null @@ -1,15 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * This program is used to generate definitions needed by - * assembly language modules. - * - */ - -#include <linux/kbuild.h> -#include <linux/thread_info.h> - -int main(void) -{ - DEFINE(THREAD_INFO_SIZE, sizeof(struct thread_info)); - return 0; -} diff --git a/arch/metag/kernel/cachepart.c b/arch/metag/kernel/cachepart.c deleted file mode 100644 index 6e0f8a80cc96..000000000000 --- a/arch/metag/kernel/cachepart.c +++ /dev/null @@ -1,132 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Meta cache partition manipulation. - * - * Copyright 2010 Imagination Technologies Ltd. - */ - -#include <linux/kernel.h> -#include <linux/io.h> -#include <linux/errno.h> -#include <asm/processor.h> -#include <asm/cachepart.h> -#include <asm/metag_isa.h> -#include <asm/metag_mem.h> - -#define SYSC_DCPART(n) (SYSC_DCPART0 + SYSC_xCPARTn_STRIDE * (n)) -#define SYSC_ICPART(n) (SYSC_ICPART0 + SYSC_xCPARTn_STRIDE * (n)) - -#define CACHE_ASSOCIATIVITY 4 /* 4 way set-associative */ -#define ICACHE 0 -#define DCACHE 1 - -/* The CORE_CONFIG2 register is not available on Meta 1 */ -#ifdef CONFIG_METAG_META21 -unsigned int get_dcache_size(void) -{ - unsigned int config2 = metag_in32(METAC_CORE_CONFIG2); - unsigned int sz = 0x1000 << ((config2 & METAC_CORECFG2_DCSZ_BITS) - >> METAC_CORECFG2_DCSZ_S); - if (config2 & METAC_CORECFG2_DCSMALL_BIT) - sz >>= 6; - return sz; -} - -unsigned int get_icache_size(void) -{ - unsigned int config2 = metag_in32(METAC_CORE_CONFIG2); - unsigned int sz = 0x1000 << ((config2 & METAC_CORE_C2ICSZ_BITS) - >> METAC_CORE_C2ICSZ_S); - if (config2 & METAC_CORECFG2_ICSMALL_BIT) - sz >>= 6; - return sz; -} - -unsigned int get_global_dcache_size(void) -{ - unsigned int cpart = metag_in32(SYSC_DCPART(hard_processor_id())); - unsigned int temp = cpart & SYSC_xCPARTG_AND_BITS; - return (get_dcache_size() * ((temp >> SYSC_xCPARTG_AND_S) + 1)) >> 4; -} - -unsigned int get_global_icache_size(void) -{ - unsigned int cpart = metag_in32(SYSC_ICPART(hard_processor_id())); - unsigned int temp = cpart & SYSC_xCPARTG_AND_BITS; - return (get_icache_size() * ((temp >> SYSC_xCPARTG_AND_S) + 1)) >> 4; -} - -static int get_thread_cache_size(unsigned int cache, int thread_id) -{ - unsigned int cache_size; - unsigned int t_cache_part; - unsigned int isEnabled; - unsigned int offset = 0; - isEnabled = (cache == DCACHE ? metag_in32(MMCU_DCACHE_CTRL_ADDR) & 0x1 : - metag_in32(MMCU_ICACHE_CTRL_ADDR) & 0x1); - if (!isEnabled) - return 0; -#if PAGE_OFFSET >= LINGLOBAL_BASE - /* Checking for global cache */ - cache_size = (cache == DCACHE ? get_global_dcache_size() : - get_global_icache_size()); - offset = 8; -#else - cache_size = (cache == DCACHE ? get_dcache_size() : - get_icache_size()); -#endif - t_cache_part = (cache == DCACHE ? - (metag_in32(SYSC_DCPART(thread_id)) >> offset) & 0xF : - (metag_in32(SYSC_ICPART(thread_id)) >> offset) & 0xF); - switch (t_cache_part) { - case 0xF: - return cache_size; - case 0x7: - return cache_size / 2; - case 0x3: - return cache_size / 4; - case 0x1: - return cache_size / 8; - case 0: - return cache_size / 16; - } - return -1; -} - -void check_for_cache_aliasing(int thread_id) -{ - int thread_cache_size; - unsigned int cache_type; - for (cache_type = ICACHE; cache_type <= DCACHE; cache_type++) { - thread_cache_size = - get_thread_cache_size(cache_type, thread_id); - if (thread_cache_size < 0) - pr_emerg("Can't read %s cache size\n", - cache_type ? "DCACHE" : "ICACHE"); - else if (thread_cache_size == 0) - /* Cache is off. No need to check for aliasing */ - continue; - if (thread_cache_size / CACHE_ASSOCIATIVITY > PAGE_SIZE) { - pr_emerg("Potential cache aliasing detected in %s on Thread %d\n", - cache_type ? "DCACHE" : "ICACHE", thread_id); - pr_warn("Total %s size: %u bytes\n", - cache_type ? "DCACHE" : "ICACHE", - cache_type ? get_dcache_size() - : get_icache_size()); - pr_warn("Thread %s size: %d bytes\n", - cache_type ? "CACHE" : "ICACHE", - thread_cache_size); - pr_warn("Page Size: %lu bytes\n", PAGE_SIZE); - panic("Potential cache aliasing detected"); - } - } -} - -#else - -void check_for_cache_aliasing(int thread_id) -{ - return; -} - -#endif diff --git a/arch/metag/kernel/clock.c b/arch/metag/kernel/clock.c deleted file mode 100644 index 6339c9c6d0ab..000000000000 --- a/arch/metag/kernel/clock.c +++ /dev/null @@ -1,110 +0,0 @@ -/* - * arch/metag/kernel/clock.c - * - * Copyright (C) 2012 Imagination Technologies Ltd. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/clk.h> -#include <linux/delay.h> -#include <linux/io.h> -#include <linux/of.h> - -#include <asm/param.h> -#include <asm/clock.h> - -struct meta_clock_desc _meta_clock; - -/* Default machine get_core_freq callback. */ -static unsigned long get_core_freq_default(void) -{ -#ifdef CONFIG_METAG_META21 - /* - * Meta 2 cores divide down the core clock for the Meta timers, so we - * can estimate the core clock from the divider. - */ - return (metag_in32(EXPAND_TIMER_DIV) + 1) * 1000000; -#else - /* - * On Meta 1 we don't know the core clock, but assuming the Meta timer - * is correct it can be estimated based on loops_per_jiffy. - */ - return (loops_per_jiffy * HZ * 5) >> 1; -#endif -} - -static struct clk *clk_core; - -/* Clk based get_core_freq callback. */ -static unsigned long get_core_freq_clk(void) -{ - return clk_get_rate(clk_core); -} - -/** - * init_metag_core_clock() - Set up core clock from devicetree. - * - * Checks to see if a "core" clock is provided in the device tree, and overrides - * the get_core_freq callback to use it. - */ -static void __init init_metag_core_clock(void) -{ - /* - * See if a core clock is provided by the devicetree (and - * registered by the init callback above). - */ - struct device_node *node; - node = of_find_compatible_node(NULL, NULL, "img,meta"); - if (!node) { - pr_warn("%s: no compatible img,meta DT node found\n", - __func__); - return; - } - - clk_core = of_clk_get_by_name(node, "core"); - if (IS_ERR(clk_core)) { - pr_warn("%s: no core clock found in DT\n", - __func__); - return; - } - - /* - * Override the core frequency callback to use - * this clk. - */ - _meta_clock.get_core_freq = get_core_freq_clk; -} - -/** - * init_metag_clocks() - Set up clocks from devicetree. - * - * Set up important clocks from device tree. In particular any needed for clock - * sources. - */ -void __init init_metag_clocks(void) -{ - init_metag_core_clock(); - - pr_info("Core clock frequency: %lu Hz\n", get_coreclock()); -} - -/** - * setup_meta_clocks() - Early set up of the Meta clock. - * @desc: Clock descriptor usually provided by machine description - * - * Ensures all callbacks are valid. - */ -void __init setup_meta_clocks(struct meta_clock_desc *desc) -{ - /* copy callbacks */ - if (desc) - _meta_clock = *desc; - - /* set fallback functions */ - if (!_meta_clock.get_core_freq) - _meta_clock.get_core_freq = get_core_freq_default; -} - diff --git a/arch/metag/kernel/core_reg.c b/arch/metag/kernel/core_reg.c deleted file mode 100644 index df2833f2766f..000000000000 --- a/arch/metag/kernel/core_reg.c +++ /dev/null @@ -1,118 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Support for reading and writing Meta core internal registers. - * - * Copyright (C) 2011 Imagination Technologies Ltd. - * - */ - -#include <linux/delay.h> -#include <linux/export.h> - -#include <asm/core_reg.h> -#include <asm/global_lock.h> -#include <asm/hwthread.h> -#include <asm/io.h> -#include <asm/metag_mem.h> -#include <asm/metag_regs.h> - -#define UNIT_BIT_MASK TXUXXRXRQ_UXX_BITS -#define REG_BIT_MASK TXUXXRXRQ_RX_BITS -#define THREAD_BIT_MASK TXUXXRXRQ_TX_BITS - -#define UNIT_SHIFTS TXUXXRXRQ_UXX_S -#define REG_SHIFTS TXUXXRXRQ_RX_S -#define THREAD_SHIFTS TXUXXRXRQ_TX_S - -#define UNIT_VAL(x) (((x) << UNIT_SHIFTS) & UNIT_BIT_MASK) -#define REG_VAL(x) (((x) << REG_SHIFTS) & REG_BIT_MASK) -#define THREAD_VAL(x) (((x) << THREAD_SHIFTS) & THREAD_BIT_MASK) - -/* - * core_reg_write() - modify the content of a register in a core unit. - * @unit: The unit to be modified. - * @reg: Register number within the unit. - * @thread: The thread we want to access. - * @val: The new value to write. - * - * Check asm/metag_regs.h for a list/defines of supported units (ie: TXUPC_ID, - * TXUTR_ID, etc), and regnums within the units (ie: TXMASKI_REGNUM, - * TXPOLLI_REGNUM, etc). - */ -void core_reg_write(int unit, int reg, int thread, unsigned int val) -{ - unsigned long flags; - - /* TXUCT_ID has its own memory mapped registers */ - if (unit == TXUCT_ID) { - void __iomem *cu_reg = __CU_addr(thread, reg); - metag_out32(val, cu_reg); - return; - } - - __global_lock2(flags); - - /* wait for ready */ - while (!(metag_in32(TXUXXRXRQ) & TXUXXRXRQ_DREADY_BIT)) - udelay(10); - - /* set the value to write */ - metag_out32(val, TXUXXRXDT); - - /* set the register to write */ - val = UNIT_VAL(unit) | REG_VAL(reg) | THREAD_VAL(thread); - metag_out32(val, TXUXXRXRQ); - - /* wait for finish */ - while (!(metag_in32(TXUXXRXRQ) & TXUXXRXRQ_DREADY_BIT)) - udelay(10); - - __global_unlock2(flags); -} -EXPORT_SYMBOL(core_reg_write); - -/* - * core_reg_read() - read the content of a register in a core unit. - * @unit: The unit to be modified. - * @reg: Register number within the unit. - * @thread: The thread we want to access. - * - * Check asm/metag_regs.h for a list/defines of supported units (ie: TXUPC_ID, - * TXUTR_ID, etc), and regnums within the units (ie: TXMASKI_REGNUM, - * TXPOLLI_REGNUM, etc). - */ -unsigned int core_reg_read(int unit, int reg, int thread) -{ - unsigned long flags; - unsigned int val; - - /* TXUCT_ID has its own memory mapped registers */ - if (unit == TXUCT_ID) { - void __iomem *cu_reg = __CU_addr(thread, reg); - val = metag_in32(cu_reg); - return val; - } - - __global_lock2(flags); - - /* wait for ready */ - while (!(metag_in32(TXUXXRXRQ) & TXUXXRXRQ_DREADY_BIT)) - udelay(10); - - /* set the register to read */ - val = (UNIT_VAL(unit) | REG_VAL(reg) | THREAD_VAL(thread) | - TXUXXRXRQ_RDnWR_BIT); - metag_out32(val, TXUXXRXRQ); - - /* wait for finish */ - while (!(metag_in32(TXUXXRXRQ) & TXUXXRXRQ_DREADY_BIT)) - udelay(10); - - /* read the register value */ - val = metag_in32(TXUXXRXDT); - - __global_unlock2(flags); - - return val; -} -EXPORT_SYMBOL(core_reg_read); diff --git a/arch/metag/kernel/da.c b/arch/metag/kernel/da.c deleted file mode 100644 index a35dbed6fffa..000000000000 --- a/arch/metag/kernel/da.c +++ /dev/null @@ -1,25 +0,0 @@ -/* - * Meta DA JTAG debugger control. - * - * Copyright 2012 Imagination Technologies Ltd. - */ - - -#include <linux/export.h> -#include <linux/io.h> -#include <linux/kernel.h> -#include <asm/da.h> -#include <asm/metag_mem.h> - -bool _metag_da_present; -EXPORT_SYMBOL_GPL(_metag_da_present); - -int __init metag_da_probe(void) -{ - _metag_da_present = (metag_in32(T0VECINT_BHALT) == 1); - if (_metag_da_present) - pr_info("DA present\n"); - else - pr_info("DA not present\n"); - return 0; -} diff --git a/arch/metag/kernel/devtree.c b/arch/metag/kernel/devtree.c deleted file mode 100644 index 6af749a64438..000000000000 --- a/arch/metag/kernel/devtree.c +++ /dev/null @@ -1,57 +0,0 @@ -/* - * linux/arch/metag/kernel/devtree.c - * - * Copyright (C) 2012 Imagination Technologies Ltd. - * - * Based on ARM version: - * Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/init.h> -#include <linux/export.h> -#include <linux/types.h> -#include <linux/of_fdt.h> - -#include <asm/setup.h> -#include <asm/page.h> -#include <asm/mach/arch.h> - -static const void * __init arch_get_next_mach(const char *const **match) -{ - static const struct machine_desc *mdesc = __arch_info_begin; - const struct machine_desc *m = mdesc; - - if (m >= __arch_info_end) - return NULL; - - mdesc++; - *match = m->dt_compat; - return m; -} - -/** - * setup_machine_fdt - Machine setup when an dtb was passed to the kernel - * @dt: virtual address pointer to dt blob - * - * If a dtb was passed to the kernel, then use it to choose the correct - * machine_desc and to setup the system. - */ -const struct machine_desc * __init setup_machine_fdt(void *dt) -{ - const struct machine_desc *mdesc; - - /* check device tree validity */ - if (!early_init_dt_scan(dt)) - return NULL; - - mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach); - if (!mdesc) - dump_machine_table(); /* does not return */ - pr_info("Machine name: %s\n", mdesc->name); - - return mdesc; -} diff --git a/arch/metag/kernel/dma.c b/arch/metag/kernel/dma.c deleted file mode 100644 index f0ab3a498328..000000000000 --- a/arch/metag/kernel/dma.c +++ /dev/null @@ -1,588 +0,0 @@ -/* - * Meta version derived from arch/powerpc/lib/dma-noncoherent.c - * Copyright (C) 2008 Imagination Technologies Ltd. - * - * PowerPC version derived from arch/arm/mm/consistent.c - * Copyright (C) 2001 Dan Malek (dmalek@jlc.net) - * - * Copyright (C) 2000 Russell King - * - * Consistent memory allocators. Used for DMA devices that want to - * share uncached memory with the processor core. The function return - * is the virtual address and 'dma_handle' is the physical address. - * Mostly stolen from the ARM port, with some changes for PowerPC. - * -- Dan - * - * Reorganized to get rid of the arch-specific consistent_* functions - * and provide non-coherent implementations for the DMA API. -Matt - * - * Added in_interrupt() safe dma_alloc_coherent()/dma_free_coherent() - * implementation. This is pulled straight from ARM and barely - * modified. -Matt - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/export.h> -#include <linux/string.h> -#include <linux/types.h> -#include <linux/highmem.h> -#include <linux/dma-mapping.h> -#include <linux/slab.h> - -#include <asm/tlbflush.h> -#include <asm/mmu.h> - -#define CONSISTENT_OFFSET(x) (((unsigned long)(x) - CONSISTENT_START) \ - >> PAGE_SHIFT) - -static u64 get_coherent_dma_mask(struct device *dev) -{ - u64 mask = ~0ULL; - - if (dev) { - mask = dev->coherent_dma_mask; - - /* - * Sanity check the DMA mask - it must be non-zero, and - * must be able to be satisfied by a DMA allocation. - */ - if (mask == 0) { - dev_warn(dev, "coherent DMA mask is unset\n"); - return 0; - } - } - - return mask; -} -/* - * This is the page table (2MB) covering uncached, DMA consistent allocations - */ -static pte_t *consistent_pte; -static DEFINE_SPINLOCK(consistent_lock); - -/* - * VM region handling support. - * - * This should become something generic, handling VM region allocations for - * vmalloc and similar (ioremap, module space, etc). - * - * I envisage vmalloc()'s supporting vm_struct becoming: - * - * struct vm_struct { - * struct metag_vm_region region; - * unsigned long flags; - * struct page **pages; - * unsigned int nr_pages; - * unsigned long phys_addr; - * }; - * - * get_vm_area() would then call metag_vm_region_alloc with an appropriate - * struct metag_vm_region head (eg): - * - * struct metag_vm_region vmalloc_head = { - * .vm_list = LIST_HEAD_INIT(vmalloc_head.vm_list), - * .vm_start = VMALLOC_START, - * .vm_end = VMALLOC_END, - * }; - * - * However, vmalloc_head.vm_start is variable (typically, it is dependent on - * the amount of RAM found at boot time.) I would imagine that get_vm_area() - * would have to initialise this each time prior to calling - * metag_vm_region_alloc(). - */ -struct metag_vm_region { - struct list_head vm_list; - unsigned long vm_start; - unsigned long vm_end; - struct page *vm_pages; - int vm_active; -}; - -static struct metag_vm_region consistent_head = { - .vm_list = LIST_HEAD_INIT(consistent_head.vm_list), - .vm_start = CONSISTENT_START, - .vm_end = CONSISTENT_END, -}; - -static struct metag_vm_region *metag_vm_region_alloc(struct metag_vm_region - *head, size_t size, - gfp_t gfp) -{ - unsigned long addr = head->vm_start, end = head->vm_end - size; - unsigned long flags; - struct metag_vm_region *c, *new; - - new = kmalloc(sizeof(struct metag_vm_region), gfp); - if (!new) - goto out; - - spin_lock_irqsave(&consistent_lock, flags); - - list_for_each_entry(c, &head->vm_list, vm_list) { - if ((addr + size) < addr) - goto nospc; - if ((addr + size) <= c->vm_start) - goto found; - addr = c->vm_end; - if (addr > end) - goto nospc; - } - -found: - /* - * Insert this entry _before_ the one we found. - */ - list_add_tail(&new->vm_list, &c->vm_list); - new->vm_start = addr; - new->vm_end = addr + size; - new->vm_active = 1; - - spin_unlock_irqrestore(&consistent_lock, flags); - return new; - -nospc: - spin_unlock_irqrestore(&consistent_lock, flags); - kfree(new); -out: - return NULL; -} - -static struct metag_vm_region *metag_vm_region_find(struct metag_vm_region - *head, unsigned long addr) -{ - struct metag_vm_region *c; - - list_for_each_entry(c, &head->vm_list, vm_list) { - if (c->vm_active && c->vm_start == addr) - goto out; - } - c = NULL; -out: - return c; -} - -/* - * Allocate DMA-coherent memory space and return both the kernel remapped - * virtual and bus address for that space. - */ -static void *metag_dma_alloc(struct device *dev, size_t size, - dma_addr_t *handle, gfp_t gfp, unsigned long attrs) -{ - struct page *page; - struct metag_vm_region *c; - unsigned long order; - u64 mask = get_coherent_dma_mask(dev); - u64 limit; - - if (!consistent_pte) { - pr_err("%s: not initialised\n", __func__); - dump_stack(); - return NULL; - } - - if (!mask) - goto no_page; - size = PAGE_ALIGN(size); - limit = (mask + 1) & ~mask; - if ((limit && size >= limit) - || size >= (CONSISTENT_END - CONSISTENT_START)) { - pr_warn("coherent allocation too big (requested %#x mask %#Lx)\n", - size, mask); - return NULL; - } - - order = get_order(size); - - if (mask != 0xffffffff) - gfp |= GFP_DMA; - - page = alloc_pages(gfp, order); - if (!page) - goto no_page; - - /* - * Invalidate any data that might be lurking in the - * kernel direct-mapped region for device DMA. - */ - { - void *kaddr = page_address(page); - memset(kaddr, 0, size); - flush_dcache_region(kaddr, size); - } - - /* - * Allocate a virtual address in the consistent mapping region. - */ - c = metag_vm_region_alloc(&consistent_head, size, - gfp & ~(__GFP_DMA | __GFP_HIGHMEM)); - if (c) { - unsigned long vaddr = c->vm_start; - pte_t *pte = consistent_pte + CONSISTENT_OFFSET(vaddr); - struct page *end = page + (1 << order); - - c->vm_pages = page; - split_page(page, order); - - /* - * Set the "dma handle" - */ - *handle = page_to_bus(page); - - do { - BUG_ON(!pte_none(*pte)); - - SetPageReserved(page); - set_pte_at(&init_mm, vaddr, - pte, mk_pte(page, - pgprot_writecombine - (PAGE_KERNEL))); - page++; - pte++; - vaddr += PAGE_SIZE; - } while (size -= PAGE_SIZE); - - /* - * Free the otherwise unused pages. - */ - while (page < end) { - __free_page(page); - page++; - } - - return (void *)c->vm_start; - } - - if (page) - __free_pages(page, order); -no_page: - return NULL; -} - -/* - * free a page as defined by the above mapping. - */ -static void metag_dma_free(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle, unsigned long attrs) -{ - struct metag_vm_region *c; - unsigned long flags, addr; - pte_t *ptep; - - size = PAGE_ALIGN(size); - - spin_lock_irqsave(&consistent_lock, flags); - - c = metag_vm_region_find(&consistent_head, (unsigned long)vaddr); - if (!c) - goto no_area; - - c->vm_active = 0; - if ((c->vm_end - c->vm_start) != size) { - pr_err("%s: freeing wrong coherent size (%ld != %d)\n", - __func__, c->vm_end - c->vm_start, size); - dump_stack(); - size = c->vm_end - c->vm_start; - } - - ptep = consistent_pte + CONSISTENT_OFFSET(c->vm_start); - addr = c->vm_start; - do { - pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep); - unsigned long pfn; - - ptep++; - addr += PAGE_SIZE; - - if (!pte_none(pte) && pte_present(pte)) { - pfn = pte_pfn(pte); - - if (pfn_valid(pfn)) { - struct page *page = pfn_to_page(pfn); - __free_reserved_page(page); - continue; - } - } - - pr_crit("%s: bad page in kernel page table\n", - __func__); - } while (size -= PAGE_SIZE); - - flush_tlb_kernel_range(c->vm_start, c->vm_end); - - list_del(&c->vm_list); - - spin_unlock_irqrestore(&consistent_lock, flags); - - kfree(c); - return; - -no_area: - spin_unlock_irqrestore(&consistent_lock, flags); - pr_err("%s: trying to free invalid coherent area: %p\n", - __func__, vaddr); - dump_stack(); -} - -static int metag_dma_mmap(struct device *dev, struct vm_area_struct *vma, - void *cpu_addr, dma_addr_t dma_addr, size_t size, - unsigned long attrs) -{ - unsigned long flags, user_size, kern_size; - struct metag_vm_region *c; - int ret = -ENXIO; - - if (attrs & DMA_ATTR_WRITE_COMBINE) - vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); - else - vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); - - user_size = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; - - spin_lock_irqsave(&consistent_lock, flags); - c = metag_vm_region_find(&consistent_head, (unsigned long)cpu_addr); - spin_unlock_irqrestore(&consistent_lock, flags); - - if (c) { - unsigned long off = vma->vm_pgoff; - - kern_size = (c->vm_end - c->vm_start) >> PAGE_SHIFT; - - if (off < kern_size && - user_size <= (kern_size - off)) { - ret = remap_pfn_range(vma, vma->vm_start, - page_to_pfn(c->vm_pages) + off, - user_size << PAGE_SHIFT, - vma->vm_page_prot); - } - } - - - return ret; -} - -/* - * Initialise the consistent memory allocation. - */ -static int __init dma_alloc_init(void) -{ - pgd_t *pgd, *pgd_k; - pud_t *pud, *pud_k; - pmd_t *pmd, *pmd_k; - pte_t *pte; - int ret = 0; - - do { - int offset = pgd_index(CONSISTENT_START); - pgd = pgd_offset(&init_mm, CONSISTENT_START); - pud = pud_alloc(&init_mm, pgd, CONSISTENT_START); - pmd = pmd_alloc(&init_mm, pud, CONSISTENT_START); - WARN_ON(!pmd_none(*pmd)); - - pte = pte_alloc_kernel(pmd, CONSISTENT_START); - if (!pte) { - pr_err("%s: no pte tables\n", __func__); - ret = -ENOMEM; - break; - } - - pgd_k = ((pgd_t *) mmu_get_base()) + offset; - pud_k = pud_offset(pgd_k, CONSISTENT_START); - pmd_k = pmd_offset(pud_k, CONSISTENT_START); - set_pmd(pmd_k, *pmd); - - consistent_pte = pte; - } while (0); - - return ret; -} -early_initcall(dma_alloc_init); - -/* - * make an area consistent to devices. - */ -static void dma_sync_for_device(void *vaddr, size_t size, int dma_direction) -{ - /* - * Ensure any writes get through the write combiner. This is necessary - * even with DMA_FROM_DEVICE, or the write may dirty the cache after - * we've invalidated it and get written back during the DMA. - */ - - barrier(); - - switch (dma_direction) { - case DMA_BIDIRECTIONAL: - /* - * Writeback to ensure the device can see our latest changes and - * so that we have no dirty lines, and invalidate the cache - * lines too in preparation for receiving the buffer back - * (dma_sync_for_cpu) later. - */ - flush_dcache_region(vaddr, size); - break; - case DMA_TO_DEVICE: - /* - * Writeback to ensure the device can see our latest changes. - * There's no need to invalidate as the device shouldn't write - * to the buffer. - */ - writeback_dcache_region(vaddr, size); - break; - case DMA_FROM_DEVICE: - /* - * Invalidate to ensure we have no dirty lines that could get - * written back during the DMA. It's also safe to flush - * (writeback) here if necessary. - */ - invalidate_dcache_region(vaddr, size); - break; - case DMA_NONE: - BUG(); - } - - wmb(); -} - -/* - * make an area consistent to the core. - */ -static void dma_sync_for_cpu(void *vaddr, size_t size, int dma_direction) -{ - /* - * Hardware L2 cache prefetch doesn't occur across 4K physical - * boundaries, however according to Documentation/DMA-API-HOWTO.txt - * kmalloc'd memory is DMA'able, so accesses in nearby memory could - * trigger a cache fill in the DMA buffer. - * - * This should never cause dirty lines, so a flush or invalidate should - * be safe to allow us to see data from the device. - */ - if (_meta_l2c_pf_is_enabled()) { - switch (dma_direction) { - case DMA_BIDIRECTIONAL: - case DMA_FROM_DEVICE: - invalidate_dcache_region(vaddr, size); - break; - case DMA_TO_DEVICE: - /* The device shouldn't have written to the buffer */ - break; - case DMA_NONE: - BUG(); - } - } - - rmb(); -} - -static dma_addr_t metag_dma_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction direction, unsigned long attrs) -{ - if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - dma_sync_for_device((void *)(page_to_phys(page) + offset), - size, direction); - return page_to_phys(page) + offset; -} - -static void metag_dma_unmap_page(struct device *dev, dma_addr_t dma_address, - size_t size, enum dma_data_direction direction, - unsigned long attrs) -{ - if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - dma_sync_for_cpu(phys_to_virt(dma_address), size, direction); -} - -static int metag_dma_map_sg(struct device *dev, struct scatterlist *sglist, - int nents, enum dma_data_direction direction, - unsigned long attrs) -{ - struct scatterlist *sg; - int i; - - for_each_sg(sglist, sg, nents, i) { - BUG_ON(!sg_page(sg)); - - sg->dma_address = sg_phys(sg); - - if (attrs & DMA_ATTR_SKIP_CPU_SYNC) - continue; - - dma_sync_for_device(sg_virt(sg), sg->length, direction); - } - - return nents; -} - - -static void metag_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, - int nhwentries, enum dma_data_direction direction, - unsigned long attrs) -{ - struct scatterlist *sg; - int i; - - for_each_sg(sglist, sg, nhwentries, i) { - BUG_ON(!sg_page(sg)); - - sg->dma_address = sg_phys(sg); - - if (attrs & DMA_ATTR_SKIP_CPU_SYNC) - continue; - - dma_sync_for_cpu(sg_virt(sg), sg->length, direction); - } -} - -static void metag_dma_sync_single_for_cpu(struct device *dev, - dma_addr_t dma_handle, size_t size, - enum dma_data_direction direction) -{ - dma_sync_for_cpu(phys_to_virt(dma_handle), size, direction); -} - -static void metag_dma_sync_single_for_device(struct device *dev, - dma_addr_t dma_handle, size_t size, - enum dma_data_direction direction) -{ - dma_sync_for_device(phys_to_virt(dma_handle), size, direction); -} - -static void metag_dma_sync_sg_for_cpu(struct device *dev, - struct scatterlist *sglist, int nelems, - enum dma_data_direction direction) -{ - int i; - struct scatterlist *sg; - - for_each_sg(sglist, sg, nelems, i) - dma_sync_for_cpu(sg_virt(sg), sg->length, direction); -} - -static void metag_dma_sync_sg_for_device(struct device *dev, - struct scatterlist *sglist, int nelems, - enum dma_data_direction direction) -{ - int i; - struct scatterlist *sg; - - for_each_sg(sglist, sg, nelems, i) - dma_sync_for_device(sg_virt(sg), sg->length, direction); -} - -const struct dma_map_ops metag_dma_ops = { - .alloc = metag_dma_alloc, - .free = metag_dma_free, - .map_page = metag_dma_map_page, - .map_sg = metag_dma_map_sg, - .sync_single_for_device = metag_dma_sync_single_for_device, - .sync_single_for_cpu = metag_dma_sync_single_for_cpu, - .sync_sg_for_cpu = metag_dma_sync_sg_for_cpu, - .mmap = metag_dma_mmap, -}; -EXPORT_SYMBOL(metag_dma_ops); diff --git a/arch/metag/kernel/ftrace.c b/arch/metag/kernel/ftrace.c deleted file mode 100644 index f7b23d300881..000000000000 --- a/arch/metag/kernel/ftrace.c +++ /dev/null @@ -1,121 +0,0 @@ -/* - * Copyright (C) 2008 Imagination Technologies Ltd. - * Licensed under the GPL - * - * Dynamic ftrace support. - */ - -#include <linux/ftrace.h> -#include <linux/io.h> -#include <linux/uaccess.h> - -#include <asm/cacheflush.h> - -#define D04_MOVT_TEMPLATE 0x02200005 -#define D04_CALL_TEMPLATE 0xAC200005 -#define D1RTP_MOVT_TEMPLATE 0x03200005 -#define D1RTP_CALL_TEMPLATE 0xAC200006 - -static const unsigned long NOP[2] = {0xa0fffffe, 0xa0fffffe}; -static unsigned long movt_and_call_insn[2]; - -static unsigned char *ftrace_nop_replace(void) -{ - return (char *)&NOP[0]; -} - -static unsigned char *ftrace_call_replace(unsigned long pc, unsigned long addr) -{ - unsigned long hi16, low16; - - hi16 = (addr & 0xffff0000) >> 13; - low16 = (addr & 0x0000ffff) << 3; - - /* - * The compiler makes the call to mcount_wrapper() - * (Meta's wrapper around mcount()) through the register - * D0.4. So whenever we're patching one of those compiler-generated - * calls we also need to go through D0.4. Otherwise use D1RtP. - */ - if (pc == (unsigned long)&ftrace_call) { - writel(D1RTP_MOVT_TEMPLATE | hi16, &movt_and_call_insn[0]); - writel(D1RTP_CALL_TEMPLATE | low16, &movt_and_call_insn[1]); - } else { - writel(D04_MOVT_TEMPLATE | hi16, &movt_and_call_insn[0]); - writel(D04_CALL_TEMPLATE | low16, &movt_and_call_insn[1]); - } - - return (unsigned char *)&movt_and_call_insn[0]; -} - -static int ftrace_modify_code(unsigned long pc, unsigned char *old_code, - unsigned char *new_code) -{ - unsigned char replaced[MCOUNT_INSN_SIZE]; - - /* - * Note: - * We are paranoid about modifying text, as if a bug was to happen, it - * could cause us to read or write to someplace that could cause harm. - * Carefully read and modify the code with probe_kernel_*(), and make - * sure what we read is what we expected it to be before modifying it. - */ - - /* read the text we want to modify */ - if (probe_kernel_read(replaced, (void *)pc, MCOUNT_INSN_SIZE)) - return -EFAULT; - - /* Make sure it is what we expect it to be */ - if (memcmp(replaced, old_code, MCOUNT_INSN_SIZE) != 0) - return -EINVAL; - - /* replace the text with the new text */ - if (probe_kernel_write((void *)pc, new_code, MCOUNT_INSN_SIZE)) - return -EPERM; - - flush_icache_range(pc, pc + MCOUNT_INSN_SIZE); - - return 0; -} - -int ftrace_update_ftrace_func(ftrace_func_t func) -{ - int ret; - unsigned long pc; - unsigned char old[MCOUNT_INSN_SIZE], *new; - - pc = (unsigned long)&ftrace_call; - memcpy(old, &ftrace_call, MCOUNT_INSN_SIZE); - new = ftrace_call_replace(pc, (unsigned long)func); - ret = ftrace_modify_code(pc, old, new); - - return ret; -} - -int ftrace_make_nop(struct module *mod, - struct dyn_ftrace *rec, unsigned long addr) -{ - unsigned char *new, *old; - unsigned long ip = rec->ip; - - old = ftrace_call_replace(ip, addr); - new = ftrace_nop_replace(); - - return ftrace_modify_code(ip, old, new); -} - -int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr) -{ - unsigned char *new, *old; - unsigned long ip = rec->ip; - - old = ftrace_nop_replace(); - new = ftrace_call_replace(ip, addr); - - return ftrace_modify_code(ip, old, new); -} - -int __init ftrace_dyn_arch_init(void) -{ - return 0; -} diff --git a/arch/metag/kernel/ftrace_stub.S b/arch/metag/kernel/ftrace_stub.S deleted file mode 100644 index 3acc288217c0..000000000000 --- a/arch/metag/kernel/ftrace_stub.S +++ /dev/null @@ -1,62 +0,0 @@ -/* - * Copyright (C) 2008 Imagination Technologies Ltd. - * Licensed under the GPL - * - */ - -#include <asm/ftrace.h> - - .text -#ifdef CONFIG_DYNAMIC_FTRACE - .global _mcount_wrapper - .type _mcount_wrapper,function -_mcount_wrapper: - MOV PC,D0.4 - - .global _ftrace_caller - .type _ftrace_caller,function -_ftrace_caller: - MSETL [A0StP], D0Ar6, D0Ar4, D0Ar2, D0.4 - MOV D1Ar1, D0.4 - MOV D0Ar2, D1RtP - SUB D1Ar1,D1Ar1,#MCOUNT_INSN_SIZE - - .global _ftrace_call -_ftrace_call: - MOVT D1RtP,#HI(_ftrace_stub) - CALL D1RtP,#LO(_ftrace_stub) - GETL D0.4, D1RtP, [A0StP++#(-8)] - GETL D0Ar2, D1Ar1, [A0StP++#(-8)] - GETL D0Ar4, D1Ar3, [A0StP++#(-8)] - GETL D0Ar6, D1Ar5, [A0StP++#(-8)] - MOV PC, D0.4 -#else - - .global _mcount_wrapper - .type _mcount_wrapper,function -_mcount_wrapper: - MSETL [A0StP], D0Ar6, D0Ar4, D0Ar2, D0.4 - MOV D1Ar1, D0.4 - MOV D0Ar2, D1RtP - MOVT D0Re0,#HI(_ftrace_trace_function) - ADD D0Re0,D0Re0,#LO(_ftrace_trace_function) - GET D1Ar3,[D0Re0] - MOVT D1Re0,#HI(_ftrace_stub) - ADD D1Re0,D1Re0,#LO(_ftrace_stub) - CMP D1Ar3,D1Re0 - BEQ $Ltrace_exit - MOV D1RtP,D1Ar3 - SUB D1Ar1,D1Ar1,#MCOUNT_INSN_SIZE - SWAP PC,D1RtP -$Ltrace_exit: - GETL D0.4, D1RtP, [A0StP++#(-8)] - GETL D0Ar2, D1Ar1, [A0StP++#(-8)] - GETL D0Ar4, D1Ar3, [A0StP++#(-8)] - GETL D0Ar6, D1Ar5, [A0StP++#(-8)] - MOV PC, D0.4 - -#endif /* CONFIG_DYNAMIC_FTRACE */ - - .global _ftrace_stub -_ftrace_stub: - MOV PC,D1RtP diff --git a/arch/metag/kernel/head.S b/arch/metag/kernel/head.S deleted file mode 100644 index 3ed27813413e..000000000000 --- a/arch/metag/kernel/head.S +++ /dev/null @@ -1,66 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ - ! Copyright 2005,2006,2007,2009 Imagination Technologies - -#include <linux/init.h> -#include <asm/metag_mem.h> -#include <generated/asm-offsets.h> -#undef __exit - - __HEAD - ! Setup the stack and get going into _metag_start_kernel - .global __start - .type __start,function -__start: - ! D1Ar1 contains pTBI (ISTAT) - ! D0Ar2 contains pTBI - ! D1Ar3 contains __pTBISegs - ! D0Ar4 contains kernel arglist pointer - - MOVT D0Re0,#HI(___pTBIs) - ADD D0Re0,D0Re0,#LO(___pTBIs) - SETL [D0Re0],D0Ar2,D1Ar1 - MOVT D0Re0,#HI(___pTBISegs) - ADD D0Re0,D0Re0,#LO(___pTBISegs) - SETD [D0Re0],D1Ar3 - MOV A0FrP,#0 - MOV D0Re0,#0 - MOV D1Re0,#0 - MOV D1Ar3,#0 - MOV D1Ar1,D0Ar4 !Store kernel boot params - MOV D1Ar5,#0 - MOV D0Ar6,#0 -#ifdef CONFIG_METAG_DSP - MOV D0.8,#0 -#endif - MOVT A0StP,#HI(_init_thread_union) - ADD A0StP,A0StP,#LO(_init_thread_union) - ADD A0StP,A0StP,#THREAD_INFO_SIZE - MOVT D1RtP,#HI(_metag_start_kernel) - CALL D1RtP,#LO(_metag_start_kernel) - .size __start,.-__start - - !! Needed by TBX - .global __exit - .type __exit,function -__exit: - XOR TXENABLE,D0Re0,D0Re0 - .size __exit,.-__exit - -#ifdef CONFIG_SMP - .global _secondary_startup - .type _secondary_startup,function -_secondary_startup: -#if CONFIG_PAGE_OFFSET < LINGLOBAL_BASE - ! In case GCOn has just been turned on we need to fence any writes that - ! the boot thread might have performed prior to coherency taking effect. - MOVT D0Re0,#HI(LINSYSEVENT_WR_ATOMIC_UNLOCK) - MOV D1Re0,#0 - SETD [D0Re0], D1Re0 -#endif - MOVT A0StP,#HI(_secondary_data_stack) - ADD A0StP,A0StP,#LO(_secondary_data_stack) - GETD A0StP,[A0StP] - ADD A0StP,A0StP,#THREAD_INFO_SIZE - B _secondary_start_kernel - .size _secondary_startup,.-_secondary_startup -#endif diff --git a/arch/metag/kernel/irq.c b/arch/metag/kernel/irq.c deleted file mode 100644 index 704cf17f8370..000000000000 --- a/arch/metag/kernel/irq.c +++ /dev/null @@ -1,293 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Linux/Meta general interrupt handling code - * - */ - -#include <linux/kernel.h> -#include <linux/interrupt.h> -#include <linux/init.h> -#include <linux/irqchip/metag-ext.h> -#include <linux/irqchip/metag.h> -#include <linux/irqdomain.h> -#include <linux/ratelimit.h> - -#include <asm/core_reg.h> -#include <asm/mach/arch.h> -#include <linux/uaccess.h> - -#ifdef CONFIG_4KSTACKS -union irq_ctx { - struct thread_info tinfo; - u32 stack[THREAD_SIZE/sizeof(u32)]; -}; - -static union irq_ctx *hardirq_ctx[NR_CPUS] __read_mostly; -static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly; -#endif - -static struct irq_domain *root_domain; - -static unsigned int startup_meta_irq(struct irq_data *data) -{ - tbi_startup_interrupt(data->hwirq); - return 0; -} - -static void shutdown_meta_irq(struct irq_data *data) -{ - tbi_shutdown_interrupt(data->hwirq); -} - -void do_IRQ(int irq, struct pt_regs *regs) -{ - struct pt_regs *old_regs = set_irq_regs(regs); -#ifdef CONFIG_4KSTACKS - struct irq_desc *desc; - union irq_ctx *curctx, *irqctx; - u32 *isp; -#endif - - irq_enter(); - - irq = irq_linear_revmap(root_domain, irq); - -#ifdef CONFIG_DEBUG_STACKOVERFLOW - /* Debugging check for stack overflow: is there less than 1KB free? */ - { - unsigned long sp; - - sp = __core_reg_get(A0StP); - sp &= THREAD_SIZE - 1; - - if (unlikely(sp > (THREAD_SIZE - 1024))) - pr_err("Stack overflow in do_IRQ: %ld\n", sp); - } -#endif - - -#ifdef CONFIG_4KSTACKS - curctx = (union irq_ctx *) current_thread_info(); - irqctx = hardirq_ctx[smp_processor_id()]; - - /* - * this is where we switch to the IRQ stack. However, if we are - * already using the IRQ stack (because we interrupted a hardirq - * handler) we can't do that and just have to keep using the - * current stack (which is the irq stack already after all) - */ - if (curctx != irqctx) { - /* build the stack frame on the IRQ stack */ - isp = (u32 *) ((char *)irqctx + sizeof(struct thread_info)); - irqctx->tinfo.task = curctx->tinfo.task; - - /* - * Copy the softirq bits in preempt_count so that the - * softirq checks work in the hardirq context. - */ - irqctx->tinfo.preempt_count = - (irqctx->tinfo.preempt_count & ~SOFTIRQ_MASK) | - (curctx->tinfo.preempt_count & SOFTIRQ_MASK); - - desc = irq_to_desc(irq); - - asm volatile ( - "MOV D0.5,%0\n" - "MOV D1Ar1,%1\n" - "MOV D1RtP,%2\n" - "SWAP A0StP,D0.5\n" - "SWAP PC,D1RtP\n" - "MOV A0StP,D0.5\n" - : - : "r" (isp), "r" (desc), "r" (desc->handle_irq) - : "memory", "cc", "D1Ar1", "D0Ar2", "D1Ar3", "D0Ar4", - "D1Ar5", "D0Ar6", "D0Re0", "D1Re0", "D0.4", "D1RtP", - "D0.5" - ); - } else -#endif - generic_handle_irq(irq); - - irq_exit(); - - set_irq_regs(old_regs); -} - -#ifdef CONFIG_4KSTACKS - -static char softirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss; - -static char hardirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss; - -/* - * allocate per-cpu stacks for hardirq and for softirq processing - */ -void irq_ctx_init(int cpu) -{ - union irq_ctx *irqctx; - - if (hardirq_ctx[cpu]) - return; - - irqctx = (union irq_ctx *) &hardirq_stack[cpu * THREAD_SIZE]; - irqctx->tinfo.task = NULL; - irqctx->tinfo.cpu = cpu; - irqctx->tinfo.preempt_count = HARDIRQ_OFFSET; - irqctx->tinfo.addr_limit = MAKE_MM_SEG(0); - - hardirq_ctx[cpu] = irqctx; - - irqctx = (union irq_ctx *) &softirq_stack[cpu * THREAD_SIZE]; - irqctx->tinfo.task = NULL; - irqctx->tinfo.cpu = cpu; - irqctx->tinfo.preempt_count = 0; - irqctx->tinfo.addr_limit = MAKE_MM_SEG(0); - - softirq_ctx[cpu] = irqctx; - - pr_info("CPU %u irqstacks, hard=%p soft=%p\n", - cpu, hardirq_ctx[cpu], softirq_ctx[cpu]); -} - -void irq_ctx_exit(int cpu) -{ - hardirq_ctx[smp_processor_id()] = NULL; -} - -extern asmlinkage void __do_softirq(void); - -void do_softirq_own_stack(void) -{ - struct thread_info *curctx; - union irq_ctx *irqctx; - u32 *isp; - - curctx = current_thread_info(); - irqctx = softirq_ctx[smp_processor_id()]; - irqctx->tinfo.task = curctx->task; - - /* build the stack frame on the softirq stack */ - isp = (u32 *) ((char *)irqctx + sizeof(struct thread_info)); - - asm volatile ( - "MOV D0.5,%0\n" - "SWAP A0StP,D0.5\n" - "CALLR D1RtP,___do_softirq\n" - "MOV A0StP,D0.5\n" - : - : "r" (isp) - : "memory", "cc", "D1Ar1", "D0Ar2", "D1Ar3", "D0Ar4", - "D1Ar5", "D0Ar6", "D0Re0", "D1Re0", "D0.4", "D1RtP", - "D0.5" - ); -} -#endif - -static struct irq_chip meta_irq_type = { - .name = "META-IRQ", - .irq_startup = startup_meta_irq, - .irq_shutdown = shutdown_meta_irq, -}; - -/** - * tbisig_map() - Map a TBI signal number to a virtual IRQ number. - * @hw: Number of the TBI signal. Must be in range. - * - * Returns: The virtual IRQ number of the TBI signal number IRQ specified by - * @hw. - */ -int tbisig_map(unsigned int hw) -{ - return irq_create_mapping(root_domain, hw); -} - -/** - * metag_tbisig_map() - map a tbi signal to a Linux virtual IRQ number - * @d: root irq domain - * @irq: virtual irq number - * @hw: hardware irq number (TBI signal number) - * - * This sets up a virtual irq for a specified TBI signal number. - */ -static int metag_tbisig_map(struct irq_domain *d, unsigned int irq, - irq_hw_number_t hw) -{ -#ifdef CONFIG_SMP - irq_set_chip_and_handler(irq, &meta_irq_type, handle_percpu_irq); -#else - irq_set_chip_and_handler(irq, &meta_irq_type, handle_simple_irq); -#endif - return 0; -} - -static const struct irq_domain_ops metag_tbisig_domain_ops = { - .map = metag_tbisig_map, -}; - -/* - * void init_IRQ(void) - * - * Parameters: None - * - * Returns: Nothing - * - * This function should be called during kernel startup to initialize - * the IRQ handling routines. - */ -void __init init_IRQ(void) -{ - root_domain = irq_domain_add_linear(NULL, 32, - &metag_tbisig_domain_ops, NULL); - if (unlikely(!root_domain)) - panic("init_IRQ: cannot add root IRQ domain"); - - irq_ctx_init(smp_processor_id()); - - init_internal_IRQ(); - init_external_IRQ(); - - if (machine_desc->init_irq) - machine_desc->init_irq(); -} - -int __init arch_probe_nr_irqs(void) -{ - if (machine_desc->nr_irqs) - nr_irqs = machine_desc->nr_irqs; - return 0; -} - -#ifdef CONFIG_HOTPLUG_CPU -/* - * The CPU has been marked offline. Migrate IRQs off this CPU. If - * the affinity settings do not allow other CPUs, force them onto any - * available CPU. - */ -void migrate_irqs(void) -{ - unsigned int i, cpu = smp_processor_id(); - - for_each_active_irq(i) { - struct irq_data *data = irq_get_irq_data(i); - struct cpumask *mask; - unsigned int newcpu; - - if (irqd_is_per_cpu(data)) - continue; - - mask = irq_data_get_affinity_mask(data); - if (!cpumask_test_cpu(cpu, mask)) - continue; - - newcpu = cpumask_any_and(mask, cpu_online_mask); - - if (newcpu >= nr_cpu_ids) { - pr_info_ratelimited("IRQ%u no longer affine to CPU%u\n", - i, cpu); - - cpumask_setall(mask); - } - irq_set_affinity(i, mask); - } -} -#endif /* CONFIG_HOTPLUG_CPU */ diff --git a/arch/metag/kernel/kick.c b/arch/metag/kernel/kick.c deleted file mode 100644 index beb377621322..000000000000 --- a/arch/metag/kernel/kick.c +++ /dev/null @@ -1,110 +0,0 @@ -/* - * Copyright (C) 2009 Imagination Technologies - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file COPYING in the main directory of this archive - * for more details. - * - * The Meta KICK interrupt mechanism is generally a useful feature, so - * we provide an interface for registering multiple interrupt - * handlers. All the registered interrupt handlers are "chained". When - * a KICK interrupt is received the first function in the list is - * called. If that interrupt handler cannot handle the KICK the next - * one is called, then the next until someone handles it (or we run - * out of functions). As soon as one function handles the interrupt no - * other handlers are called. - * - * The only downside of chaining interrupt handlers is that each - * handler must be able to detect whether the KICK was intended for it - * or not. For example, when the IPI handler runs and it sees that - * there are no IPI messages it must not signal that the KICK was - * handled, thereby giving the other handlers a chance to run. - * - * The reason that we provide our own interface for calling KICK - * handlers instead of using the generic kernel infrastructure is that - * the KICK handlers require access to a CPU's pTBI structure. So we - * pass it as an argument. - */ -#include <linux/export.h> -#include <linux/hardirq.h> -#include <linux/irq.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/types.h> - -#include <asm/traps.h> - -/* - * All accesses/manipulations of kick_handlers_list should be - * performed while holding kick_handlers_lock. - */ -static DEFINE_SPINLOCK(kick_handlers_lock); -static LIST_HEAD(kick_handlers_list); - -void kick_register_func(struct kick_irq_handler *kh) -{ - unsigned long flags; - - spin_lock_irqsave(&kick_handlers_lock, flags); - - list_add_tail(&kh->list, &kick_handlers_list); - - spin_unlock_irqrestore(&kick_handlers_lock, flags); -} -EXPORT_SYMBOL(kick_register_func); - -void kick_unregister_func(struct kick_irq_handler *kh) -{ - unsigned long flags; - - spin_lock_irqsave(&kick_handlers_lock, flags); - - list_del(&kh->list); - - spin_unlock_irqrestore(&kick_handlers_lock, flags); -} -EXPORT_SYMBOL(kick_unregister_func); - -TBIRES -kick_handler(TBIRES State, int SigNum, int Triggers, int Inst, PTBI pTBI) -{ - struct pt_regs *old_regs; - struct kick_irq_handler *kh; - struct list_head *lh; - int handled = 0; - TBIRES ret; - - head_end(State, ~INTS_OFF_MASK); - - /* If we interrupted user code handle any critical sections. */ - if (State.Sig.SaveMask & TBICTX_PRIV_BIT) - restart_critical_section(State); - - trace_hardirqs_off(); - - old_regs = set_irq_regs((struct pt_regs *)State.Sig.pCtx); - irq_enter(); - - /* - * There is no need to disable interrupts here because we - * can't nest KICK interrupts in a KICK interrupt handler. - */ - spin_lock(&kick_handlers_lock); - - list_for_each(lh, &kick_handlers_list) { - kh = list_entry(lh, struct kick_irq_handler, list); - - ret = kh->func(State, SigNum, Triggers, Inst, pTBI, &handled); - if (handled) - break; - } - - spin_unlock(&kick_handlers_lock); - - WARN_ON(!handled); - - irq_exit(); - set_irq_regs(old_regs); - - return tail_end(ret); -} diff --git a/arch/metag/kernel/machines.c b/arch/metag/kernel/machines.c deleted file mode 100644 index e49790181051..000000000000 --- a/arch/metag/kernel/machines.c +++ /dev/null @@ -1,21 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * arch/metag/kernel/machines.c - * - * Copyright (C) 2012 Imagination Technologies Ltd. - * - * Generic Meta Boards. - */ - -#include <linux/init.h> -#include <asm/irq.h> -#include <asm/mach/arch.h> - -static const char *meta_boards_compat[] __initdata = { - "img,meta", - NULL, -}; - -MACHINE_START(META, "Generic Meta") - .dt_compat = meta_boards_compat, -MACHINE_END diff --git a/arch/metag/kernel/metag_ksyms.c b/arch/metag/kernel/metag_ksyms.c deleted file mode 100644 index e312386efb72..000000000000 --- a/arch/metag/kernel/metag_ksyms.c +++ /dev/null @@ -1,55 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -#include <linux/export.h> -#include <linux/types.h> - -#include <asm/checksum.h> -#include <asm/div64.h> -#include <asm/ftrace.h> -#include <asm/page.h> -#include <asm/string.h> -#include <asm/tbx.h> - -EXPORT_SYMBOL(clear_page); -EXPORT_SYMBOL(copy_page); - -#ifdef CONFIG_FLATMEM -/* needed for the pfn_valid macro */ -EXPORT_SYMBOL(max_pfn); -EXPORT_SYMBOL(min_low_pfn); -#endif - -/* Network checksum functions */ -EXPORT_SYMBOL(csum_partial); - -/* TBI symbols */ -EXPORT_SYMBOL(__TBI); -EXPORT_SYMBOL(__TBIFindSeg); -EXPORT_SYMBOL(__TBIPoll); -EXPORT_SYMBOL(__TBITimeStamp); - -#define DECLARE_EXPORT(name) extern void name(void); EXPORT_SYMBOL(name) - -/* libgcc functions */ -DECLARE_EXPORT(__ashldi3); -DECLARE_EXPORT(__ashrdi3); -DECLARE_EXPORT(__lshrdi3); -DECLARE_EXPORT(__udivsi3); -DECLARE_EXPORT(__divsi3); -DECLARE_EXPORT(__umodsi3); -DECLARE_EXPORT(__modsi3); -DECLARE_EXPORT(__muldi3); -DECLARE_EXPORT(__cmpdi2); -DECLARE_EXPORT(__ucmpdi2); - -/* Maths functions */ -EXPORT_SYMBOL(div_u64); -EXPORT_SYMBOL(div_s64); - -/* String functions */ -EXPORT_SYMBOL(memcpy); -EXPORT_SYMBOL(memset); -EXPORT_SYMBOL(memmove); - -#ifdef CONFIG_FUNCTION_TRACER -EXPORT_SYMBOL(mcount_wrapper); -#endif diff --git a/arch/metag/kernel/module.c b/arch/metag/kernel/module.c deleted file mode 100644 index bb8dfba9a763..000000000000 --- a/arch/metag/kernel/module.c +++ /dev/null @@ -1,284 +0,0 @@ -/* Kernel module help for Meta. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. -*/ -#include <linux/moduleloader.h> -#include <linux/elf.h> -#include <linux/vmalloc.h> -#include <linux/fs.h> -#include <linux/string.h> -#include <linux/kernel.h> -#include <linux/sort.h> - -#include <asm/unaligned.h> - -/* Count how many different relocations (different symbol, different - addend) */ -static unsigned int count_relocs(const Elf32_Rela *rela, unsigned int num) -{ - unsigned int i, r_info, r_addend, _count_relocs; - - _count_relocs = 0; - r_info = 0; - r_addend = 0; - for (i = 0; i < num; i++) - /* Only count relbranch relocs, others don't need stubs */ - if (ELF32_R_TYPE(rela[i].r_info) == R_METAG_RELBRANCH && - (r_info != ELF32_R_SYM(rela[i].r_info) || - r_addend != rela[i].r_addend)) { - _count_relocs++; - r_info = ELF32_R_SYM(rela[i].r_info); - r_addend = rela[i].r_addend; - } - - return _count_relocs; -} - -static int relacmp(const void *_x, const void *_y) -{ - const Elf32_Rela *x, *y; - - y = (Elf32_Rela *)_x; - x = (Elf32_Rela *)_y; - - /* Compare the entire r_info (as opposed to ELF32_R_SYM(r_info) only) to - * make the comparison cheaper/faster. It won't affect the sorting or - * the counting algorithms' performance - */ - if (x->r_info < y->r_info) - return -1; - else if (x->r_info > y->r_info) - return 1; - else if (x->r_addend < y->r_addend) - return -1; - else if (x->r_addend > y->r_addend) - return 1; - else - return 0; -} - -static void relaswap(void *_x, void *_y, int size) -{ - uint32_t *x, *y, tmp; - int i; - - y = (uint32_t *)_x; - x = (uint32_t *)_y; - - for (i = 0; i < sizeof(Elf32_Rela) / sizeof(uint32_t); i++) { - tmp = x[i]; - x[i] = y[i]; - y[i] = tmp; - } -} - -/* Get the potential trampolines size required of the init and - non-init sections */ -static unsigned long get_plt_size(const Elf32_Ehdr *hdr, - const Elf32_Shdr *sechdrs, - const char *secstrings, - int is_init) -{ - unsigned long ret = 0; - unsigned i; - - /* Everything marked ALLOC (this includes the exported - symbols) */ - for (i = 1; i < hdr->e_shnum; i++) { - /* If it's called *.init*, and we're not init, we're - not interested */ - if ((strstr(secstrings + sechdrs[i].sh_name, ".init") != NULL) - != is_init) - continue; - - /* We don't want to look at debug sections. */ - if (strstr(secstrings + sechdrs[i].sh_name, ".debug") != NULL) - continue; - - if (sechdrs[i].sh_type == SHT_RELA) { - pr_debug("Found relocations in section %u\n", i); - pr_debug("Ptr: %p. Number: %u\n", - (void *)hdr + sechdrs[i].sh_offset, - sechdrs[i].sh_size / sizeof(Elf32_Rela)); - - /* Sort the relocation information based on a symbol and - * addend key. This is a stable O(n*log n) complexity - * alogrithm but it will reduce the complexity of - * count_relocs() to linear complexity O(n) - */ - sort((void *)hdr + sechdrs[i].sh_offset, - sechdrs[i].sh_size / sizeof(Elf32_Rela), - sizeof(Elf32_Rela), relacmp, relaswap); - - ret += count_relocs((void *)hdr - + sechdrs[i].sh_offset, - sechdrs[i].sh_size - / sizeof(Elf32_Rela)) - * sizeof(struct metag_plt_entry); - } - } - - return ret; -} - -int module_frob_arch_sections(Elf32_Ehdr *hdr, - Elf32_Shdr *sechdrs, - char *secstrings, - struct module *me) -{ - unsigned int i; - - /* Find .plt and .init.plt sections */ - for (i = 0; i < hdr->e_shnum; i++) { - if (strcmp(secstrings + sechdrs[i].sh_name, ".init.plt") == 0) - me->arch.init_plt_section = i; - else if (strcmp(secstrings + sechdrs[i].sh_name, ".plt") == 0) - me->arch.core_plt_section = i; - } - if (!me->arch.core_plt_section || !me->arch.init_plt_section) { - pr_err("Module doesn't contain .plt or .init.plt sections.\n"); - return -ENOEXEC; - } - - /* Override their sizes */ - sechdrs[me->arch.core_plt_section].sh_size - = get_plt_size(hdr, sechdrs, secstrings, 0); - sechdrs[me->arch.core_plt_section].sh_type = SHT_NOBITS; - sechdrs[me->arch.init_plt_section].sh_size - = get_plt_size(hdr, sechdrs, secstrings, 1); - sechdrs[me->arch.init_plt_section].sh_type = SHT_NOBITS; - return 0; -} - -/* Set up a trampoline in the PLT to bounce us to the distant function */ -static uint32_t do_plt_call(void *location, Elf32_Addr val, - Elf32_Shdr *sechdrs, struct module *mod) -{ - struct metag_plt_entry *entry; - /* Instructions used to do the indirect jump. */ - uint32_t tramp[2]; - - /* We have to trash a register, so we assume that any control - transfer more than 21-bits away must be a function call - (so we can use a call-clobbered register). */ - - /* MOVT D0Re0,#HI(v) */ - tramp[0] = 0x02000005 | (((val & 0xffff0000) >> 16) << 3); - /* JUMP D0Re0,#LO(v) */ - tramp[1] = 0xac000001 | ((val & 0x0000ffff) << 3); - - /* Init, or core PLT? */ - if (location >= mod->core_layout.base - && location < mod->core_layout.base + mod->core_layout.size) - entry = (void *)sechdrs[mod->arch.core_plt_section].sh_addr; - else - entry = (void *)sechdrs[mod->arch.init_plt_section].sh_addr; - - /* Find this entry, or if that fails, the next avail. entry */ - while (entry->tramp[0]) - if (entry->tramp[0] == tramp[0] && entry->tramp[1] == tramp[1]) - return (uint32_t)entry; - else - entry++; - - entry->tramp[0] = tramp[0]; - entry->tramp[1] = tramp[1]; - - return (uint32_t)entry; -} - -int apply_relocate_add(Elf32_Shdr *sechdrs, - const char *strtab, - unsigned int symindex, - unsigned int relsec, - struct module *me) -{ - unsigned int i; - Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; - Elf32_Sym *sym; - Elf32_Addr relocation; - uint32_t *location; - int32_t value; - - pr_debug("Applying relocate section %u to %u\n", relsec, - sechdrs[relsec].sh_info); - for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { - /* This is where to make the change */ - location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr - + rel[i].r_offset; - /* This is the symbol it is referring to. Note that all - undefined symbols have been resolved. */ - sym = (Elf32_Sym *)sechdrs[symindex].sh_addr - + ELF32_R_SYM(rel[i].r_info); - relocation = sym->st_value + rel[i].r_addend; - - switch (ELF32_R_TYPE(rel[i].r_info)) { - case R_METAG_NONE: - break; - case R_METAG_HIADDR16: - relocation >>= 16; - case R_METAG_LOADDR16: - *location = (*location & 0xfff80007) | - ((relocation & 0xffff) << 3); - break; - case R_METAG_ADDR32: - /* - * Packed data structures may cause a misaligned - * R_METAG_ADDR32 to be emitted. - */ - put_unaligned(relocation, location); - break; - case R_METAG_GETSETOFF: - *location += ((relocation & 0xfff) << 7); - break; - case R_METAG_RELBRANCH: - if (*location & (0x7ffff << 5)) { - pr_err("bad relbranch relocation\n"); - break; - } - - /* This jump is too big for the offset slot. Build - * a PLT to jump through to get to where we want to go. - * NB: 21bit check - not scaled to 19bit yet - */ - if (((int32_t)(relocation - - (uint32_t)location) > 0xfffff) || - ((int32_t)(relocation - - (uint32_t)location) < -0xfffff)) { - relocation = do_plt_call(location, relocation, - sechdrs, me); - } - - value = relocation - (uint32_t)location; - - /* branch instruction aligned */ - value /= 4; - - if ((value > 0x7ffff) || (value < -0x7ffff)) { - /* - * this should have been caught by the code - * above! - */ - pr_err("overflow of relbranch reloc\n"); - } - - *location = (*location & (~(0x7ffff << 5))) | - ((value & 0x7ffff) << 5); - break; - - default: - pr_err("module %s: Unknown relocation: %u\n", - me->name, ELF32_R_TYPE(rel[i].r_info)); - return -ENOEXEC; - } - } - return 0; -} diff --git a/arch/metag/kernel/perf/Makefile b/arch/metag/kernel/perf/Makefile deleted file mode 100644 index b158cb27208d..000000000000 --- a/arch/metag/kernel/perf/Makefile +++ /dev/null @@ -1,3 +0,0 @@ -# Makefile for performance event core - -obj-y += perf_event.o diff --git a/arch/metag/kernel/perf/perf_event.c b/arch/metag/kernel/perf/perf_event.c deleted file mode 100644 index 7e793eb0c1fe..000000000000 --- a/arch/metag/kernel/perf/perf_event.c +++ /dev/null @@ -1,879 +0,0 @@ -/* - * Meta performance counter support. - * Copyright (C) 2012 Imagination Technologies Ltd - * - * This code is based on the sh pmu code: - * Copyright (C) 2009 Paul Mundt - * - * and on the arm pmu code: - * Copyright (C) 2009 picoChip Designs, Ltd., James Iles - * Copyright (C) 2010 ARM Ltd., Will Deacon <will.deacon@arm.com> - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - */ - -#include <linux/atomic.h> -#include <linux/export.h> -#include <linux/init.h> -#include <linux/irqchip/metag.h> -#include <linux/perf_event.h> -#include <linux/slab.h> - -#include <asm/core_reg.h> -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/processor.h> - -#include "perf_event.h" - -static int _hw_perf_event_init(struct perf_event *); -static void _hw_perf_event_destroy(struct perf_event *); - -/* Determines which core type we are */ -static struct metag_pmu *metag_pmu __read_mostly; - -/* Processor specific data */ -static DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events); - -/* PMU admin */ -const char *perf_pmu_name(void) -{ - if (!metag_pmu) - return NULL; - - return metag_pmu->name; -} -EXPORT_SYMBOL_GPL(perf_pmu_name); - -int perf_num_counters(void) -{ - if (metag_pmu) - return metag_pmu->max_events; - - return 0; -} -EXPORT_SYMBOL_GPL(perf_num_counters); - -static inline int metag_pmu_initialised(void) -{ - return !!metag_pmu; -} - -static void release_pmu_hardware(void) -{ - int irq; - unsigned int version = (metag_pmu->version & - (METAC_ID_MINOR_BITS | METAC_ID_REV_BITS)) >> - METAC_ID_REV_S; - - /* Early cores don't have overflow interrupts */ - if (version < 0x0104) - return; - - irq = internal_irq_map(17); - if (irq >= 0) - free_irq(irq, (void *)1); - - irq = internal_irq_map(16); - if (irq >= 0) - free_irq(irq, (void *)0); -} - -static int reserve_pmu_hardware(void) -{ - int err = 0, irq[2]; - unsigned int version = (metag_pmu->version & - (METAC_ID_MINOR_BITS | METAC_ID_REV_BITS)) >> - METAC_ID_REV_S; - - /* Early cores don't have overflow interrupts */ - if (version < 0x0104) - goto out; - - /* - * Bit 16 on HWSTATMETA is the interrupt for performance counter 0; - * similarly, 17 is the interrupt for performance counter 1. - * We can't (yet) interrupt on the cycle counter, because it's a - * register, however it holds a 32-bit value as opposed to 24-bit. - */ - irq[0] = internal_irq_map(16); - if (irq[0] < 0) { - pr_err("unable to map internal IRQ %d\n", 16); - goto out; - } - err = request_irq(irq[0], metag_pmu->handle_irq, IRQF_NOBALANCING, - "metagpmu0", (void *)0); - if (err) { - pr_err("unable to request IRQ%d for metag PMU counters\n", - irq[0]); - goto out; - } - - irq[1] = internal_irq_map(17); - if (irq[1] < 0) { - pr_err("unable to map internal IRQ %d\n", 17); - goto out_irq1; - } - err = request_irq(irq[1], metag_pmu->handle_irq, IRQF_NOBALANCING, - "metagpmu1", (void *)1); - if (err) { - pr_err("unable to request IRQ%d for metag PMU counters\n", - irq[1]); - goto out_irq1; - } - - return 0; - -out_irq1: - free_irq(irq[0], (void *)0); -out: - return err; -} - -/* PMU operations */ -static void metag_pmu_enable(struct pmu *pmu) -{ -} - -static void metag_pmu_disable(struct pmu *pmu) -{ -} - -static int metag_pmu_event_init(struct perf_event *event) -{ - int err = 0; - atomic_t *active_events = &metag_pmu->active_events; - - if (!metag_pmu_initialised()) { - err = -ENODEV; - goto out; - } - - if (has_branch_stack(event)) - return -EOPNOTSUPP; - - event->destroy = _hw_perf_event_destroy; - - if (!atomic_inc_not_zero(active_events)) { - mutex_lock(&metag_pmu->reserve_mutex); - if (atomic_read(active_events) == 0) - err = reserve_pmu_hardware(); - - if (!err) - atomic_inc(active_events); - - mutex_unlock(&metag_pmu->reserve_mutex); - } - - /* Hardware and caches counters */ - switch (event->attr.type) { - case PERF_TYPE_HARDWARE: - case PERF_TYPE_HW_CACHE: - case PERF_TYPE_RAW: - err = _hw_perf_event_init(event); - break; - - default: - return -ENOENT; - } - - if (err) - event->destroy(event); - -out: - return err; -} - -void metag_pmu_event_update(struct perf_event *event, - struct hw_perf_event *hwc, int idx) -{ - u64 prev_raw_count, new_raw_count; - s64 delta; - - /* - * If this counter is chained, it may be that the previous counter - * value has been changed beneath us. - * - * To get around this, we read and exchange the new raw count, then - * add the delta (new - prev) to the generic counter atomically. - * - * Without interrupts, this is the simplest approach. - */ -again: - prev_raw_count = local64_read(&hwc->prev_count); - new_raw_count = metag_pmu->read(idx); - - if (local64_cmpxchg(&hwc->prev_count, prev_raw_count, - new_raw_count) != prev_raw_count) - goto again; - - /* - * Calculate the delta and add it to the counter. - */ - delta = (new_raw_count - prev_raw_count) & MAX_PERIOD; - - local64_add(delta, &event->count); - local64_sub(delta, &hwc->period_left); -} - -int metag_pmu_event_set_period(struct perf_event *event, - struct hw_perf_event *hwc, int idx) -{ - s64 left = local64_read(&hwc->period_left); - s64 period = hwc->sample_period; - int ret = 0; - - /* The period may have been changed */ - if (unlikely(period != hwc->last_period)) - left += period - hwc->last_period; - - if (unlikely(left <= -period)) { - left = period; - local64_set(&hwc->period_left, left); - hwc->last_period = period; - ret = 1; - } - - if (unlikely(left <= 0)) { - left += period; - local64_set(&hwc->period_left, left); - hwc->last_period = period; - ret = 1; - } - - if (left > (s64)metag_pmu->max_period) - left = metag_pmu->max_period; - - if (metag_pmu->write) { - local64_set(&hwc->prev_count, -(s32)left); - metag_pmu->write(idx, -left & MAX_PERIOD); - } - - perf_event_update_userpage(event); - - return ret; -} - -static void metag_pmu_start(struct perf_event *event, int flags) -{ - struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); - struct hw_perf_event *hwc = &event->hw; - int idx = hwc->idx; - - if (WARN_ON_ONCE(idx == -1)) - return; - - /* - * We always have to reprogram the period, so ignore PERF_EF_RELOAD. - */ - if (flags & PERF_EF_RELOAD) - WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE)); - - hwc->state = 0; - - /* - * Reset the period. - * Some counters can't be stopped (i.e. are core global), so when the - * counter was 'stopped' we merely disabled the IRQ. If we don't reset - * the period, then we'll either: a) get an overflow too soon; - * or b) too late if the overflow happened since disabling. - * Obviously, this has little bearing on cores without the overflow - * interrupt, as the performance counter resets to zero on write - * anyway. - */ - if (metag_pmu->max_period) - metag_pmu_event_set_period(event, hwc, hwc->idx); - cpuc->events[idx] = event; - metag_pmu->enable(hwc, idx); -} - -static void metag_pmu_stop(struct perf_event *event, int flags) -{ - struct hw_perf_event *hwc = &event->hw; - - /* - * We should always update the counter on stop; see comment above - * why. - */ - if (!(hwc->state & PERF_HES_STOPPED)) { - metag_pmu_event_update(event, hwc, hwc->idx); - metag_pmu->disable(hwc, hwc->idx); - hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE; - } -} - -static int metag_pmu_add(struct perf_event *event, int flags) -{ - struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); - struct hw_perf_event *hwc = &event->hw; - int idx = 0, ret = 0; - - perf_pmu_disable(event->pmu); - - /* check whether we're counting instructions */ - if (hwc->config == 0x100) { - if (__test_and_set_bit(METAG_INST_COUNTER, - cpuc->used_mask)) { - ret = -EAGAIN; - goto out; - } - idx = METAG_INST_COUNTER; - } else { - /* Check whether we have a spare counter */ - idx = find_first_zero_bit(cpuc->used_mask, - atomic_read(&metag_pmu->active_events)); - if (idx >= METAG_INST_COUNTER) { - ret = -EAGAIN; - goto out; - } - - __set_bit(idx, cpuc->used_mask); - } - hwc->idx = idx; - - /* Make sure the counter is disabled */ - metag_pmu->disable(hwc, idx); - - hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE; - if (flags & PERF_EF_START) - metag_pmu_start(event, PERF_EF_RELOAD); - - perf_event_update_userpage(event); -out: - perf_pmu_enable(event->pmu); - return ret; -} - -static void metag_pmu_del(struct perf_event *event, int flags) -{ - struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); - struct hw_perf_event *hwc = &event->hw; - int idx = hwc->idx; - - WARN_ON(idx < 0); - metag_pmu_stop(event, PERF_EF_UPDATE); - cpuc->events[idx] = NULL; - __clear_bit(idx, cpuc->used_mask); - - perf_event_update_userpage(event); -} - -static void metag_pmu_read(struct perf_event *event) -{ - struct hw_perf_event *hwc = &event->hw; - - /* Don't read disabled counters! */ - if (hwc->idx < 0) - return; - - metag_pmu_event_update(event, hwc, hwc->idx); -} - -static struct pmu pmu = { - .pmu_enable = metag_pmu_enable, - .pmu_disable = metag_pmu_disable, - - .event_init = metag_pmu_event_init, - - .add = metag_pmu_add, - .del = metag_pmu_del, - .start = metag_pmu_start, - .stop = metag_pmu_stop, - .read = metag_pmu_read, -}; - -/* Core counter specific functions */ -static const int metag_general_events[] = { - [PERF_COUNT_HW_CPU_CYCLES] = 0x03, - [PERF_COUNT_HW_INSTRUCTIONS] = 0x100, - [PERF_COUNT_HW_CACHE_REFERENCES] = -1, - [PERF_COUNT_HW_CACHE_MISSES] = -1, - [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = -1, - [PERF_COUNT_HW_BRANCH_MISSES] = -1, - [PERF_COUNT_HW_BUS_CYCLES] = -1, - [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = -1, - [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = -1, - [PERF_COUNT_HW_REF_CPU_CYCLES] = -1, -}; - -static const int metag_pmu_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = { - [C(L1D)] = { - [C(OP_READ)] = { - [C(RESULT_ACCESS)] = 0x08, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - [C(OP_WRITE)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - [C(OP_PREFETCH)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - }, - [C(L1I)] = { - [C(OP_READ)] = { - [C(RESULT_ACCESS)] = 0x09, - [C(RESULT_MISS)] = 0x0a, - }, - [C(OP_WRITE)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - [C(OP_PREFETCH)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - }, - [C(LL)] = { - [C(OP_READ)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - [C(OP_WRITE)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - [C(OP_PREFETCH)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - }, - [C(DTLB)] = { - [C(OP_READ)] = { - [C(RESULT_ACCESS)] = 0xd0, - [C(RESULT_MISS)] = 0xd2, - }, - [C(OP_WRITE)] = { - [C(RESULT_ACCESS)] = 0xd4, - [C(RESULT_MISS)] = 0xd5, - }, - [C(OP_PREFETCH)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - }, - [C(ITLB)] = { - [C(OP_READ)] = { - [C(RESULT_ACCESS)] = 0xd1, - [C(RESULT_MISS)] = 0xd3, - }, - [C(OP_WRITE)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - [C(OP_PREFETCH)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - }, - [C(BPU)] = { - [C(OP_READ)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - [C(OP_WRITE)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - [C(OP_PREFETCH)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - }, - [C(NODE)] = { - [C(OP_READ)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - [C(OP_WRITE)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - [C(OP_PREFETCH)] = { - [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, - [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, - }, - }, -}; - - -static void _hw_perf_event_destroy(struct perf_event *event) -{ - atomic_t *active_events = &metag_pmu->active_events; - struct mutex *pmu_mutex = &metag_pmu->reserve_mutex; - - if (atomic_dec_and_mutex_lock(active_events, pmu_mutex)) { - release_pmu_hardware(); - mutex_unlock(pmu_mutex); - } -} - -static int _hw_perf_cache_event(int config, int *evp) -{ - unsigned long type, op, result; - int ev; - - if (!metag_pmu->cache_events) - return -EINVAL; - - /* Unpack config */ - type = config & 0xff; - op = (config >> 8) & 0xff; - result = (config >> 16) & 0xff; - - if (type >= PERF_COUNT_HW_CACHE_MAX || - op >= PERF_COUNT_HW_CACHE_OP_MAX || - result >= PERF_COUNT_HW_CACHE_RESULT_MAX) - return -EINVAL; - - ev = (*metag_pmu->cache_events)[type][op][result]; - if (ev == 0) - return -EOPNOTSUPP; - if (ev == -1) - return -EINVAL; - *evp = ev; - return 0; -} - -static int _hw_perf_event_init(struct perf_event *event) -{ - struct perf_event_attr *attr = &event->attr; - struct hw_perf_event *hwc = &event->hw; - int mapping = 0, err; - - switch (attr->type) { - case PERF_TYPE_HARDWARE: - if (attr->config >= PERF_COUNT_HW_MAX) - return -EINVAL; - - mapping = metag_pmu->event_map(attr->config); - break; - - case PERF_TYPE_HW_CACHE: - err = _hw_perf_cache_event(attr->config, &mapping); - if (err) - return err; - break; - - case PERF_TYPE_RAW: - mapping = attr->config; - break; - } - - /* Return early if the event is unsupported */ - if (mapping == -1) - return -EINVAL; - - /* - * Don't assign an index until the event is placed into the hardware. - * -1 signifies that we're still deciding where to put it. On SMP - * systems each core has its own set of counters, so we can't do any - * constraint checking yet. - */ - hwc->idx = -1; - - /* Store the event encoding */ - hwc->config |= (unsigned long)mapping; - - /* - * For non-sampling runs, limit the sample_period to half of the - * counter width. This way, the new counter value should be less - * likely to overtake the previous one (unless there are IRQ latency - * issues...) - */ - if (metag_pmu->max_period) { - if (!hwc->sample_period) { - hwc->sample_period = metag_pmu->max_period >> 1; - hwc->last_period = hwc->sample_period; - local64_set(&hwc->period_left, hwc->sample_period); - } - } - - return 0; -} - -static void metag_pmu_enable_counter(struct hw_perf_event *event, int idx) -{ - struct cpu_hw_events *events = this_cpu_ptr(&cpu_hw_events); - unsigned int config = event->config; - unsigned int tmp = config & 0xf0; - unsigned long flags; - - raw_spin_lock_irqsave(&events->pmu_lock, flags); - - /* - * Check if we're enabling the instruction counter (index of - * MAX_HWEVENTS - 1) - */ - if (METAG_INST_COUNTER == idx) { - WARN_ONCE((config != 0x100), - "invalid configuration (%d) for counter (%d)\n", - config, idx); - local64_set(&event->prev_count, __core_reg_get(TXTACTCYC)); - goto unlock; - } - - /* Check for a core internal or performance channel event. */ - if (tmp) { - /* PERF_ICORE/PERF_CHAN only exist since Meta2 */ -#ifdef METAC_2_1 - void *perf_addr; - - /* - * Anything other than a cycle count will write the low- - * nibble to the correct counter register. - */ - switch (tmp) { - case 0xd0: - perf_addr = (void *)PERF_ICORE(idx); - break; - - case 0xf0: - perf_addr = (void *)PERF_CHAN(idx); - break; - - default: - perf_addr = NULL; - break; - } - - if (perf_addr) - metag_out32((config & 0x0f), perf_addr); -#endif - - /* - * Now we use the high nibble as the performance event to - * to count. - */ - config = tmp >> 4; - } - - tmp = ((config & 0xf) << 28) | - ((1 << 24) << hard_processor_id()); - if (metag_pmu->max_period) - /* - * Cores supporting overflow interrupts may have had the counter - * set to a specific value that needs preserving. - */ - tmp |= metag_in32(PERF_COUNT(idx)) & 0x00ffffff; - else - /* - * Older cores reset the counter on write, so prev_count needs - * resetting too so we can calculate a correct delta. - */ - local64_set(&event->prev_count, 0); - - metag_out32(tmp, PERF_COUNT(idx)); -unlock: - raw_spin_unlock_irqrestore(&events->pmu_lock, flags); -} - -static void metag_pmu_disable_counter(struct hw_perf_event *event, int idx) -{ - struct cpu_hw_events *events = this_cpu_ptr(&cpu_hw_events); - unsigned int tmp = 0; - unsigned long flags; - - /* - * The cycle counter can't be disabled per se, as it's a hardware - * thread register which is always counting. We merely return if this - * is the counter we're attempting to disable. - */ - if (METAG_INST_COUNTER == idx) - return; - - /* - * The counter value _should_ have been read prior to disabling, - * as if we're running on an early core then the value gets reset to - * 0, and any read after that would be useless. On the newer cores, - * however, it's better to read-modify-update this for purposes of - * the overflow interrupt. - * Here we remove the thread id AND the event nibble (there are at - * least two events that count events that are core global and ignore - * the thread id mask). This only works because we don't mix thread - * performance counts, and event 0x00 requires a thread id mask! - */ - raw_spin_lock_irqsave(&events->pmu_lock, flags); - - tmp = metag_in32(PERF_COUNT(idx)); - tmp &= 0x00ffffff; - metag_out32(tmp, PERF_COUNT(idx)); - - raw_spin_unlock_irqrestore(&events->pmu_lock, flags); -} - -static u64 metag_pmu_read_counter(int idx) -{ - u32 tmp = 0; - - if (METAG_INST_COUNTER == idx) { - tmp = __core_reg_get(TXTACTCYC); - goto out; - } - - tmp = metag_in32(PERF_COUNT(idx)) & 0x00ffffff; -out: - return tmp; -} - -static void metag_pmu_write_counter(int idx, u32 val) -{ - struct cpu_hw_events *events = this_cpu_ptr(&cpu_hw_events); - u32 tmp = 0; - unsigned long flags; - - /* - * This _shouldn't_ happen, but if it does, then we can just - * ignore the write, as the register is read-only and clear-on-write. - */ - if (METAG_INST_COUNTER == idx) - return; - - /* - * We'll keep the thread mask and event id, and just update the - * counter itself. Also , we should bound the value to 24-bits. - */ - raw_spin_lock_irqsave(&events->pmu_lock, flags); - - val &= 0x00ffffff; - tmp = metag_in32(PERF_COUNT(idx)) & 0xff000000; - val |= tmp; - metag_out32(val, PERF_COUNT(idx)); - - raw_spin_unlock_irqrestore(&events->pmu_lock, flags); -} - -static int metag_pmu_event_map(int idx) -{ - return metag_general_events[idx]; -} - -static irqreturn_t metag_pmu_counter_overflow(int irq, void *dev) -{ - int idx = (int)dev; - struct cpu_hw_events *cpuhw = this_cpu_ptr(&cpu_hw_events); - struct perf_event *event = cpuhw->events[idx]; - struct hw_perf_event *hwc = &event->hw; - struct pt_regs *regs = get_irq_regs(); - struct perf_sample_data sampledata; - unsigned long flags; - u32 counter = 0; - - /* - * We need to stop the core temporarily from generating another - * interrupt while we disable this counter. However, we don't want - * to flag the counter as free - */ - __global_lock2(flags); - counter = metag_in32(PERF_COUNT(idx)); - metag_out32((counter & 0x00ffffff), PERF_COUNT(idx)); - __global_unlock2(flags); - - /* Update the counts and reset the sample period */ - metag_pmu_event_update(event, hwc, idx); - perf_sample_data_init(&sampledata, 0, hwc->last_period); - metag_pmu_event_set_period(event, hwc, idx); - - /* - * Enable the counter again once core overflow processing has - * completed. Note the counter value may have been modified while it was - * inactive to set it up ready for the next interrupt. - */ - if (!perf_event_overflow(event, &sampledata, regs)) { - __global_lock2(flags); - counter = (counter & 0xff000000) | - (metag_in32(PERF_COUNT(idx)) & 0x00ffffff); - metag_out32(counter, PERF_COUNT(idx)); - __global_unlock2(flags); - } - - return IRQ_HANDLED; -} - -static struct metag_pmu _metag_pmu = { - .handle_irq = metag_pmu_counter_overflow, - .enable = metag_pmu_enable_counter, - .disable = metag_pmu_disable_counter, - .read = metag_pmu_read_counter, - .write = metag_pmu_write_counter, - .event_map = metag_pmu_event_map, - .cache_events = &metag_pmu_cache_events, - .max_period = MAX_PERIOD, - .max_events = MAX_HWEVENTS, -}; - -/* PMU CPU hotplug notifier */ -static int metag_pmu_starting_cpu(unsigned int cpu) -{ - struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); - - memset(cpuc, 0, sizeof(struct cpu_hw_events)); - raw_spin_lock_init(&cpuc->pmu_lock); - - return 0; -} - -/* PMU Initialisation */ -static int __init init_hw_perf_events(void) -{ - int ret = 0, cpu; - u32 version = *(u32 *)METAC_ID; - int major = (version & METAC_ID_MAJOR_BITS) >> METAC_ID_MAJOR_S; - int min_rev = (version & (METAC_ID_MINOR_BITS | METAC_ID_REV_BITS)) - >> METAC_ID_REV_S; - - /* Not a Meta 2 core, then not supported */ - if (0x02 > major) { - pr_info("no hardware counter support available\n"); - goto out; - } else if (0x02 == major) { - metag_pmu = &_metag_pmu; - - if (min_rev < 0x0104) { - /* - * A core without overflow interrupts, and clear-on- - * write counters. - */ - metag_pmu->handle_irq = NULL; - metag_pmu->write = NULL; - metag_pmu->max_period = 0; - } - - metag_pmu->name = "meta2"; - metag_pmu->version = version; - metag_pmu->pmu = pmu; - } - - pr_info("enabled with %s PMU driver, %d counters available\n", - metag_pmu->name, metag_pmu->max_events); - - /* - * Early cores have "limited" counters - they have no overflow - * interrupts - and so are unable to do sampling without extra work - * and timer assistance. - */ - if (metag_pmu->max_period == 0) { - metag_pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT; - } - - /* Initialise the active events and reservation mutex */ - atomic_set(&metag_pmu->active_events, 0); - mutex_init(&metag_pmu->reserve_mutex); - - /* Clear the counters */ - metag_out32(0, PERF_COUNT(0)); - metag_out32(0, PERF_COUNT(1)); - - cpuhp_setup_state(CPUHP_AP_PERF_METAG_STARTING, - "perf/metag:starting", metag_pmu_starting_cpu, - NULL); - - ret = perf_pmu_register(&pmu, metag_pmu->name, PERF_TYPE_RAW); - if (ret) - cpuhp_remove_state_nocalls(CPUHP_AP_PERF_METAG_STARTING); - return ret; -} -early_initcall(init_hw_perf_events); diff --git a/arch/metag/kernel/perf/perf_event.h b/arch/metag/kernel/perf/perf_event.h deleted file mode 100644 index fd10a1345b67..000000000000 --- a/arch/metag/kernel/perf/perf_event.h +++ /dev/null @@ -1,106 +0,0 @@ -/* - * Meta performance counter support. - * Copyright (C) 2012 Imagination Technologies Ltd - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - */ - -#ifndef METAG_PERF_EVENT_H_ -#define METAG_PERF_EVENT_H_ - -#include <linux/kernel.h> -#include <linux/interrupt.h> -#include <linux/perf_event.h> - -/* For performance counter definitions */ -#include <asm/metag_mem.h> - -/* - * The Meta core has two performance counters, with 24-bit resolution. Newer - * cores generate an overflow interrupt on transition from 0xffffff to 0. - * - * Each counter consists of the counter id, hardware thread id, and the count - * itself; each counter can be assigned to multiple hardware threads at any - * one time, with the returned count being an aggregate of events. A small - * number of events are thread global, i.e. they count the aggregate of all - * threads' events, regardless of the thread selected. - * - * Newer cores can store an arbitrary 24-bit number in the counter, whereas - * older cores will clear the counter bits on write. - * - * We also have a pseudo-counter in the form of the thread active cycles - * counter (which, incidentally, is also bound to - */ - -#define MAX_HWEVENTS 3 -#define MAX_PERIOD ((1UL << 24) - 1) -#define METAG_INST_COUNTER (MAX_HWEVENTS - 1) - -/** - * struct cpu_hw_events - a processor core's performance events - * @events: an array of perf_events active for a given index. - * @used_mask: a bitmap of in-use counters. - * @pmu_lock: a perf counter lock - * - * This is a per-cpu/core structure that maintains a record of its - * performance counters' state. - */ -struct cpu_hw_events { - struct perf_event *events[MAX_HWEVENTS]; - unsigned long used_mask[BITS_TO_LONGS(MAX_HWEVENTS)]; - raw_spinlock_t pmu_lock; -}; - -/** - * struct metag_pmu - the Meta PMU structure - * @pmu: core pmu structure - * @name: pmu name - * @version: core version - * @handle_irq: overflow interrupt handler - * @enable: enable a counter - * @disable: disable a counter - * @read: read the value of a counter - * @write: write a value to a counter - * @event_map: kernel event to counter event id map - * @cache_events: kernel cache counter to core cache counter map - * @max_period: maximum value of the counter before overflow - * @max_events: maximum number of counters available at any one time - * @active_events: number of active counters - * @reserve_mutex: counter reservation mutex - * - * This describes the main functionality and data used by the performance - * event core. - */ -struct metag_pmu { - struct pmu pmu; - const char *name; - u32 version; - irqreturn_t (*handle_irq)(int irq_num, void *dev); - void (*enable)(struct hw_perf_event *evt, int idx); - void (*disable)(struct hw_perf_event *evt, int idx); - u64 (*read)(int idx); - void (*write)(int idx, u32 val); - int (*event_map)(int idx); - const int (*cache_events)[PERF_COUNT_HW_CACHE_MAX] - [PERF_COUNT_HW_CACHE_OP_MAX] - [PERF_COUNT_HW_CACHE_RESULT_MAX]; - u32 max_period; - int max_events; - atomic_t active_events; - struct mutex reserve_mutex; -}; - -/* Convenience macros for accessing the perf counters */ -/* Define some convenience accessors */ -#define PERF_COUNT(x) (PERF_COUNT0 + (sizeof(u64) * (x))) -#define PERF_ICORE(x) (PERF_ICORE0 + (sizeof(u64) * (x))) -#define PERF_CHAN(x) (PERF_CHAN0 + (sizeof(u64) * (x))) - -/* Cache index macros */ -#define C(x) PERF_COUNT_HW_CACHE_##x -#define CACHE_OP_UNSUPPORTED 0xfffe -#define CACHE_OP_NONSENSE 0xffff - -#endif diff --git a/arch/metag/kernel/perf_callchain.c b/arch/metag/kernel/perf_callchain.c deleted file mode 100644 index d325ba101de0..000000000000 --- a/arch/metag/kernel/perf_callchain.c +++ /dev/null @@ -1,97 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Perf callchain handling code. - * - * Based on the ARM perf implementation. - */ - -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/perf_event.h> -#include <linux/uaccess.h> -#include <asm/ptrace.h> -#include <asm/stacktrace.h> - -static bool is_valid_call(unsigned long calladdr) -{ - unsigned int callinsn; - - /* Check the possible return address is aligned. */ - if (!(calladdr & 0x3)) { - if (!get_user(callinsn, (unsigned int *)calladdr)) { - /* Check for CALLR or SWAP PC,D1RtP. */ - if ((callinsn & 0xff000000) == 0xab000000 || - callinsn == 0xa3200aa0) - return true; - } - } - return false; -} - -static struct metag_frame __user * -user_backtrace(struct metag_frame __user *user_frame, - struct perf_callchain_entry_ctx *entry) -{ - struct metag_frame frame; - unsigned long calladdr; - - /* We cannot rely on having frame pointers in user code. */ - while (1) { - /* Also check accessibility of one struct frame beyond */ - if (!access_ok(VERIFY_READ, user_frame, sizeof(frame))) - return 0; - if (__copy_from_user_inatomic(&frame, user_frame, - sizeof(frame))) - return 0; - - --user_frame; - - calladdr = frame.lr - 4; - if (is_valid_call(calladdr)) { - perf_callchain_store(entry, calladdr); - return user_frame; - } - } - - return 0; -} - -void -perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) -{ - unsigned long sp = regs->ctx.AX[0].U0; - struct metag_frame __user *frame; - - frame = (struct metag_frame __user *)sp; - - --frame; - - while ((entry->nr < entry->max_stack) && frame) - frame = user_backtrace(frame, entry); -} - -/* - * Gets called by walk_stackframe() for every stackframe. This will be called - * whist unwinding the stackframe and is like a subroutine return so we use - * the PC. - */ -static int -callchain_trace(struct stackframe *fr, - void *data) -{ - struct perf_callchain_entry_ctx *entry = data; - perf_callchain_store(entry, fr->pc); - return 0; -} - -void -perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) -{ - struct stackframe fr; - - fr.fp = regs->ctx.AX[1].U0; - fr.sp = regs->ctx.AX[0].U0; - fr.lr = regs->ctx.DX[4].U1; - fr.pc = regs->ctx.CurrPC; - walk_stackframe(&fr, callchain_trace, entry); -} diff --git a/arch/metag/kernel/process.c b/arch/metag/kernel/process.c deleted file mode 100644 index 0909834c83a7..000000000000 --- a/arch/metag/kernel/process.c +++ /dev/null @@ -1,448 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2005,2006,2007,2008,2009,2010,2011 Imagination Technologies - * - * This file contains the architecture-dependent parts of process handling. - * - */ - -#include <linux/errno.h> -#include <linux/export.h> -#include <linux/sched.h> -#include <linux/sched/debug.h> -#include <linux/sched/task.h> -#include <linux/sched/task_stack.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/unistd.h> -#include <linux/ptrace.h> -#include <linux/user.h> -#include <linux/reboot.h> -#include <linux/elfcore.h> -#include <linux/fs.h> -#include <linux/tick.h> -#include <linux/slab.h> -#include <linux/mman.h> -#include <linux/pm.h> -#include <linux/syscalls.h> -#include <linux/uaccess.h> -#include <linux/smp.h> -#include <asm/core_reg.h> -#include <asm/user_gateway.h> -#include <asm/tcm.h> -#include <asm/traps.h> -#include <asm/switch_to.h> - -/* - * Wait for the next interrupt and enable local interrupts - */ -void arch_cpu_idle(void) -{ - int tmp; - - /* - * Quickly jump straight into the interrupt entry point without actually - * triggering an interrupt. When TXSTATI gets read the processor will - * block until an interrupt is triggered. - */ - asm volatile (/* Switch into ISTAT mode */ - "RTH\n\t" - /* Enable local interrupts */ - "MOV TXMASKI, %1\n\t" - /* - * We can't directly "SWAP PC, PCX", so we swap via a - * temporary. Essentially we do: - * PCX_new = 1f (the place to continue execution) - * PC = PCX_old - */ - "ADD %0, CPC0, #(1f-.)\n\t" - "SWAP PCX, %0\n\t" - "MOV PC, %0\n" - /* Continue execution here with interrupts enabled */ - "1:" - : "=a" (tmp) - : "r" (get_trigger_mask())); -} - -#ifdef CONFIG_HOTPLUG_CPU -void arch_cpu_idle_dead(void) -{ - cpu_die(); -} -#endif - -void (*pm_power_off)(void); -EXPORT_SYMBOL(pm_power_off); - -void (*soc_restart)(char *cmd); -void (*soc_halt)(void); - -void machine_restart(char *cmd) -{ - if (soc_restart) - soc_restart(cmd); - hard_processor_halt(HALT_OK); -} - -void machine_halt(void) -{ - if (soc_halt) - soc_halt(); - smp_send_stop(); - hard_processor_halt(HALT_OK); -} - -void machine_power_off(void) -{ - if (pm_power_off) - pm_power_off(); - smp_send_stop(); - hard_processor_halt(HALT_OK); -} - -#define FLAG_Z 0x8 -#define FLAG_N 0x4 -#define FLAG_O 0x2 -#define FLAG_C 0x1 - -void show_regs(struct pt_regs *regs) -{ - int i; - const char *AX0_names[] = {"A0StP", "A0FrP"}; - const char *AX1_names[] = {"A1GbP", "A1LbP"}; - - const char *DX0_names[] = { - "D0Re0", - "D0Ar6", - "D0Ar4", - "D0Ar2", - "D0FrT", - "D0.5 ", - "D0.6 ", - "D0.7 " - }; - - const char *DX1_names[] = { - "D1Re0", - "D1Ar5", - "D1Ar3", - "D1Ar1", - "D1RtP", - "D1.5 ", - "D1.6 ", - "D1.7 " - }; - - show_regs_print_info(KERN_INFO); - - pr_info(" pt_regs @ %p\n", regs); - pr_info(" SaveMask = 0x%04hx\n", regs->ctx.SaveMask); - pr_info(" Flags = 0x%04hx (%c%c%c%c)\n", regs->ctx.Flags, - regs->ctx.Flags & FLAG_Z ? 'Z' : 'z', - regs->ctx.Flags & FLAG_N ? 'N' : 'n', - regs->ctx.Flags & FLAG_O ? 'O' : 'o', - regs->ctx.Flags & FLAG_C ? 'C' : 'c'); - pr_info(" TXRPT = 0x%08x\n", regs->ctx.CurrRPT); - pr_info(" PC = 0x%08x\n", regs->ctx.CurrPC); - - /* AX regs */ - for (i = 0; i < 2; i++) { - pr_info(" %s = 0x%08x ", - AX0_names[i], - regs->ctx.AX[i].U0); - printk(" %s = 0x%08x\n", - AX1_names[i], - regs->ctx.AX[i].U1); - } - - if (regs->ctx.SaveMask & TBICTX_XEXT_BIT) - pr_warn(" Extended state present - AX2.[01] will be WRONG\n"); - - /* Special place with AXx.2 */ - pr_info(" A0.2 = 0x%08x ", - regs->ctx.Ext.AX2.U0); - printk(" A1.2 = 0x%08x\n", - regs->ctx.Ext.AX2.U1); - - /* 'extended' AX regs (nominally, just AXx.3) */ - for (i = 0; i < (TBICTX_AX_REGS - 3); i++) { - pr_info(" A0.%d = 0x%08x ", i + 3, regs->ctx.AX3[i].U0); - printk(" A1.%d = 0x%08x\n", i + 3, regs->ctx.AX3[i].U1); - } - - for (i = 0; i < 8; i++) { - pr_info(" %s = 0x%08x ", DX0_names[i], regs->ctx.DX[i].U0); - printk(" %s = 0x%08x\n", DX1_names[i], regs->ctx.DX[i].U1); - } - - show_trace(NULL, (unsigned long *)regs->ctx.AX[0].U0, regs); -} - -/* - * Copy architecture-specific thread state - */ -int copy_thread(unsigned long clone_flags, unsigned long usp, - unsigned long kthread_arg, struct task_struct *tsk) -{ - struct pt_regs *childregs = task_pt_regs(tsk); - void *kernel_context = ((void *) childregs + - sizeof(struct pt_regs)); - unsigned long global_base; - - BUG_ON(((unsigned long)childregs) & 0x7); - BUG_ON(((unsigned long)kernel_context) & 0x7); - - memset(&tsk->thread.kernel_context, 0, - sizeof(tsk->thread.kernel_context)); - - tsk->thread.kernel_context = __TBISwitchInit(kernel_context, - ret_from_fork, - 0, 0); - - if (unlikely(tsk->flags & PF_KTHREAD)) { - /* - * Make sure we don't leak any kernel data to child's regs - * if kernel thread becomes a userspace thread in the future - */ - memset(childregs, 0 , sizeof(struct pt_regs)); - - global_base = __core_reg_get(A1GbP); - childregs->ctx.AX[0].U1 = (unsigned long) global_base; - childregs->ctx.AX[0].U0 = (unsigned long) kernel_context; - /* Set D1Ar1=kthread_arg and D1RtP=usp (fn) */ - childregs->ctx.DX[4].U1 = usp; - childregs->ctx.DX[3].U1 = kthread_arg; - tsk->thread.int_depth = 2; - return 0; - } - - /* - * Get a pointer to where the new child's register block should have - * been pushed. - * The Meta's stack grows upwards, and the context is the the first - * thing to be pushed by TBX (phew) - */ - *childregs = *current_pt_regs(); - /* Set the correct stack for the clone mode */ - if (usp) - childregs->ctx.AX[0].U0 = ALIGN(usp, 8); - tsk->thread.int_depth = 1; - - /* set return value for child process */ - childregs->ctx.DX[0].U0 = 0; - - /* The TLS pointer is passed as an argument to sys_clone. */ - if (clone_flags & CLONE_SETTLS) - tsk->thread.tls_ptr = - (__force void __user *)childregs->ctx.DX[1].U1; - -#ifdef CONFIG_METAG_FPU - if (tsk->thread.fpu_context) { - struct meta_fpu_context *ctx; - - ctx = kmemdup(tsk->thread.fpu_context, - sizeof(struct meta_fpu_context), GFP_ATOMIC); - tsk->thread.fpu_context = ctx; - } -#endif - -#ifdef CONFIG_METAG_DSP - if (tsk->thread.dsp_context) { - struct meta_ext_context *ctx; - int i; - - ctx = kmemdup(tsk->thread.dsp_context, - sizeof(struct meta_ext_context), GFP_ATOMIC); - for (i = 0; i < 2; i++) - ctx->ram[i] = kmemdup(ctx->ram[i], ctx->ram_sz[i], - GFP_ATOMIC); - tsk->thread.dsp_context = ctx; - } -#endif - - return 0; -} - -#ifdef CONFIG_METAG_FPU -static void alloc_fpu_context(struct thread_struct *thread) -{ - thread->fpu_context = kzalloc(sizeof(struct meta_fpu_context), - GFP_ATOMIC); -} - -static void clear_fpu(struct thread_struct *thread) -{ - thread->user_flags &= ~TBICTX_FPAC_BIT; - kfree(thread->fpu_context); - thread->fpu_context = NULL; -} -#else -static void clear_fpu(struct thread_struct *thread) -{ -} -#endif - -#ifdef CONFIG_METAG_DSP -static void clear_dsp(struct thread_struct *thread) -{ - if (thread->dsp_context) { - kfree(thread->dsp_context->ram[0]); - kfree(thread->dsp_context->ram[1]); - - kfree(thread->dsp_context); - - thread->dsp_context = NULL; - } - - __core_reg_set(D0.8, 0); -} -#else -static void clear_dsp(struct thread_struct *thread) -{ -} -#endif - -struct task_struct *__sched __switch_to(struct task_struct *prev, - struct task_struct *next) -{ - TBIRES to, from; - - to.Switch.pCtx = next->thread.kernel_context; - to.Switch.pPara = prev; - -#ifdef CONFIG_METAG_FPU - if (prev->thread.user_flags & TBICTX_FPAC_BIT) { - struct pt_regs *regs = task_pt_regs(prev); - TBIRES state; - - state.Sig.SaveMask = prev->thread.user_flags; - state.Sig.pCtx = ®s->ctx; - - if (!prev->thread.fpu_context) - alloc_fpu_context(&prev->thread); - if (prev->thread.fpu_context) - __TBICtxFPUSave(state, prev->thread.fpu_context); - } - /* - * Force a restore of the FPU context next time this process is - * scheduled. - */ - if (prev->thread.fpu_context) - prev->thread.fpu_context->needs_restore = true; -#endif - - - from = __TBISwitch(to, &prev->thread.kernel_context); - - /* Restore TLS pointer for this process. */ - set_gateway_tls(current->thread.tls_ptr); - - return (struct task_struct *) from.Switch.pPara; -} - -void flush_thread(void) -{ - clear_fpu(¤t->thread); - clear_dsp(¤t->thread); -} - -/* - * Free current thread data structures etc. - */ -void exit_thread(struct task_struct *tsk) -{ - clear_fpu(&tsk->thread); - clear_dsp(&tsk->thread); -} - -/* TODO: figure out how to unwind the kernel stack here to figure out - * where we went to sleep. */ -unsigned long get_wchan(struct task_struct *p) -{ - return 0; -} - -int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) -{ - /* Returning 0 indicates that the FPU state was not stored (as it was - * not in use) */ - return 0; -} - -#ifdef CONFIG_METAG_USER_TCM - -#define ELF_MIN_ALIGN PAGE_SIZE - -#define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1)) -#define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) -#define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) - -#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE) - -unsigned long __metag_elf_map(struct file *filep, unsigned long addr, - struct elf_phdr *eppnt, int prot, int type, - unsigned long total_size) -{ - unsigned long map_addr, size; - unsigned long page_off = ELF_PAGEOFFSET(eppnt->p_vaddr); - unsigned long raw_size = eppnt->p_filesz + page_off; - unsigned long off = eppnt->p_offset - page_off; - unsigned int tcm_tag; - addr = ELF_PAGESTART(addr); - size = ELF_PAGEALIGN(raw_size); - - /* mmap() will return -EINVAL if given a zero size, but a - * segment with zero filesize is perfectly valid */ - if (!size) - return addr; - - tcm_tag = tcm_lookup_tag(addr); - - if (tcm_tag != TCM_INVALID_TAG) - type &= ~MAP_FIXED; - - /* - * total_size is the size of the ELF (interpreter) image. - * The _first_ mmap needs to know the full size, otherwise - * randomization might put this image into an overlapping - * position with the ELF binary image. (since size < total_size) - * So we first map the 'big' image - and unmap the remainder at - * the end. (which unmap is needed for ELF images with holes.) - */ - if (total_size) { - total_size = ELF_PAGEALIGN(total_size); - map_addr = vm_mmap(filep, addr, total_size, prot, type, off); - if (!BAD_ADDR(map_addr)) - vm_munmap(map_addr+size, total_size-size); - } else - map_addr = vm_mmap(filep, addr, size, prot, type, off); - - if (!BAD_ADDR(map_addr) && tcm_tag != TCM_INVALID_TAG) { - struct tcm_allocation *tcm; - unsigned long tcm_addr; - - tcm = kmalloc(sizeof(*tcm), GFP_KERNEL); - if (!tcm) - return -ENOMEM; - - tcm_addr = tcm_alloc(tcm_tag, raw_size); - if (tcm_addr != addr) { - kfree(tcm); - return -ENOMEM; - } - - tcm->tag = tcm_tag; - tcm->addr = tcm_addr; - tcm->size = raw_size; - - list_add(&tcm->list, ¤t->mm->context.tcm); - - eppnt->p_vaddr = map_addr; - if (copy_from_user((void *) addr, (void __user *) map_addr, - raw_size)) - return -EFAULT; - } - - return map_addr; -} -#endif diff --git a/arch/metag/kernel/ptrace.c b/arch/metag/kernel/ptrace.c deleted file mode 100644 index e615603a4b0a..000000000000 --- a/arch/metag/kernel/ptrace.c +++ /dev/null @@ -1,427 +0,0 @@ -/* - * Copyright (C) 2005-2012 Imagination Technologies Ltd. - * - * This file is subject to the terms and conditions of the GNU General - * Public License. See the file COPYING in the main directory of - * this archive for more details. - */ - -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/errno.h> -#include <linux/ptrace.h> -#include <linux/user.h> -#include <linux/regset.h> -#include <linux/tracehook.h> -#include <linux/elf.h> -#include <linux/uaccess.h> -#include <linux/sched/task_stack.h> - -#include <trace/syscall.h> - -#define CREATE_TRACE_POINTS -#include <trace/events/syscalls.h> - -/* - * user_regset definitions. - */ - -static unsigned long user_txstatus(const struct pt_regs *regs) -{ - unsigned long data = (unsigned long)regs->ctx.Flags; - - if (regs->ctx.SaveMask & TBICTX_CBUF_BIT) - data |= USER_GP_REGS_STATUS_CATCH_BIT; - - return data; -} - -int metag_gp_regs_copyout(const struct pt_regs *regs, - unsigned int pos, unsigned int count, - void *kbuf, void __user *ubuf) -{ - const void *ptr; - unsigned long data; - int ret; - - /* D{0-1}.{0-7} */ - ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, - regs->ctx.DX, 0, 4*16); - if (ret) - goto out; - /* A{0-1}.{0-1} */ - ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, - regs->ctx.AX, 4*16, 4*20); - if (ret) - goto out; - /* A{0-1}.2 */ - if (regs->ctx.SaveMask & TBICTX_XEXT_BIT) - ptr = regs->ctx.Ext.Ctx.pExt; - else - ptr = ®s->ctx.Ext.AX2; - ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, - ptr, 4*20, 4*22); - if (ret) - goto out; - /* A{0-1}.3 */ - ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, - ®s->ctx.AX3, 4*22, 4*24); - if (ret) - goto out; - /* PC */ - ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, - ®s->ctx.CurrPC, 4*24, 4*25); - if (ret) - goto out; - /* TXSTATUS */ - data = user_txstatus(regs); - ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, - &data, 4*25, 4*26); - if (ret) - goto out; - /* TXRPT, TXBPOBITS, TXMODE */ - ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, - ®s->ctx.CurrRPT, 4*26, 4*29); - if (ret) - goto out; - /* Padding */ - ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, - 4*29, 4*30); -out: - return ret; -} - -int metag_gp_regs_copyin(struct pt_regs *regs, - unsigned int pos, unsigned int count, - const void *kbuf, const void __user *ubuf) -{ - void *ptr; - unsigned long data; - int ret; - - /* D{0-1}.{0-7} */ - ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, - regs->ctx.DX, 0, 4*16); - if (ret) - goto out; - /* A{0-1}.{0-1} */ - ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, - regs->ctx.AX, 4*16, 4*20); - if (ret) - goto out; - /* A{0-1}.2 */ - if (regs->ctx.SaveMask & TBICTX_XEXT_BIT) - ptr = regs->ctx.Ext.Ctx.pExt; - else - ptr = ®s->ctx.Ext.AX2; - ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, - ptr, 4*20, 4*22); - if (ret) - goto out; - /* A{0-1}.3 */ - ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, - ®s->ctx.AX3, 4*22, 4*24); - if (ret) - goto out; - /* PC */ - ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, - ®s->ctx.CurrPC, 4*24, 4*25); - if (ret) - goto out; - /* TXSTATUS */ - data = user_txstatus(regs); - ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, - &data, 4*25, 4*26); - if (ret) - goto out; - regs->ctx.Flags = data & 0xffff; - if (data & USER_GP_REGS_STATUS_CATCH_BIT) - regs->ctx.SaveMask |= TBICTX_XCBF_BIT | TBICTX_CBUF_BIT; - else - regs->ctx.SaveMask &= ~TBICTX_CBUF_BIT; - /* TXRPT, TXBPOBITS, TXMODE */ - ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, - ®s->ctx.CurrRPT, 4*26, 4*29); -out: - return ret; -} - -static int metag_gp_regs_get(struct task_struct *target, - const struct user_regset *regset, - unsigned int pos, unsigned int count, - void *kbuf, void __user *ubuf) -{ - const struct pt_regs *regs = task_pt_regs(target); - return metag_gp_regs_copyout(regs, pos, count, kbuf, ubuf); -} - -static int metag_gp_regs_set(struct task_struct *target, - const struct user_regset *regset, - unsigned int pos, unsigned int count, - const void *kbuf, const void __user *ubuf) -{ - struct pt_regs *regs = task_pt_regs(target); - return metag_gp_regs_copyin(regs, pos, count, kbuf, ubuf); -} - -int metag_cb_regs_copyout(const struct pt_regs *regs, - unsigned int pos, unsigned int count, - void *kbuf, void __user *ubuf) -{ - int ret; - - /* TXCATCH{0-3} */ - if (regs->ctx.SaveMask & TBICTX_XCBF_BIT) - ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, - regs->extcb0, 0, 4*4); - else - ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, - 0, 4*4); - return ret; -} - -int metag_cb_regs_copyin(struct pt_regs *regs, - unsigned int pos, unsigned int count, - const void *kbuf, const void __user *ubuf) -{ - int ret; - - /* TXCATCH{0-3} */ - ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, - regs->extcb0, 0, 4*4); - return ret; -} - -static int metag_cb_regs_get(struct task_struct *target, - const struct user_regset *regset, - unsigned int pos, unsigned int count, - void *kbuf, void __user *ubuf) -{ - const struct pt_regs *regs = task_pt_regs(target); - return metag_cb_regs_copyout(regs, pos, count, kbuf, ubuf); -} - -static int metag_cb_regs_set(struct task_struct *target, - const struct user_regset *regset, - unsigned int pos, unsigned int count, - const void *kbuf, const void __user *ubuf) -{ - struct pt_regs *regs = task_pt_regs(target); - return metag_cb_regs_copyin(regs, pos, count, kbuf, ubuf); -} - -int metag_rp_state_copyout(const struct pt_regs *regs, - unsigned int pos, unsigned int count, - void *kbuf, void __user *ubuf) -{ - unsigned long mask; - u64 *ptr; - int ret, i; - - /* Empty read pipeline */ - if (!(regs->ctx.SaveMask & TBICTX_CBRP_BIT)) { - ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, - 0, 4*13); - goto out; - } - - mask = (regs->ctx.CurrDIVTIME & TXDIVTIME_RPMASK_BITS) >> - TXDIVTIME_RPMASK_S; - - /* Read pipeline entries */ - ptr = (void *)®s->extcb0[1]; - for (i = 0; i < 6; ++i, ++ptr) { - if (mask & (1 << i)) - ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, - ptr, 8*i, 8*(i + 1)); - else - ret = user_regset_copyout_zero(&pos, &count, &kbuf, - &ubuf, 8*i, 8*(i + 1)); - if (ret) - goto out; - } - /* Mask of entries */ - ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, - &mask, 4*12, 4*13); -out: - return ret; -} - -int metag_rp_state_copyin(struct pt_regs *regs, - unsigned int pos, unsigned int count, - const void *kbuf, const void __user *ubuf) -{ - struct user_rp_state rp; - unsigned long long *ptr; - int ret, i; - - if (count < 4*13) - return -EINVAL; - /* Read the entire pipeline before making any changes */ - ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, - &rp, 0, 4*13); - if (ret) - goto out; - - /* Write pipeline entries */ - ptr = (void *)®s->extcb0[1]; - for (i = 0; i < 6; ++i, ++ptr) - if (rp.mask & (1 << i)) - *ptr = rp.entries[i]; - - /* Update RPMask in TXDIVTIME */ - regs->ctx.CurrDIVTIME &= ~TXDIVTIME_RPMASK_BITS; - regs->ctx.CurrDIVTIME |= (rp.mask << TXDIVTIME_RPMASK_S) - & TXDIVTIME_RPMASK_BITS; - - /* Set/clear flags to indicate catch/read pipeline state */ - if (rp.mask) - regs->ctx.SaveMask |= TBICTX_XCBF_BIT | TBICTX_CBRP_BIT; - else - regs->ctx.SaveMask &= ~TBICTX_CBRP_BIT; -out: - return ret; -} - -static int metag_rp_state_get(struct task_struct *target, - const struct user_regset *regset, - unsigned int pos, unsigned int count, - void *kbuf, void __user *ubuf) -{ - const struct pt_regs *regs = task_pt_regs(target); - return metag_rp_state_copyout(regs, pos, count, kbuf, ubuf); -} - -static int metag_rp_state_set(struct task_struct *target, - const struct user_regset *regset, - unsigned int pos, unsigned int count, - const void *kbuf, const void __user *ubuf) -{ - struct pt_regs *regs = task_pt_regs(target); - return metag_rp_state_copyin(regs, pos, count, kbuf, ubuf); -} - -static int metag_tls_get(struct task_struct *target, - const struct user_regset *regset, - unsigned int pos, unsigned int count, - void *kbuf, void __user *ubuf) -{ - void __user *tls = target->thread.tls_ptr; - return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &tls, 0, -1); -} - -static int metag_tls_set(struct task_struct *target, - const struct user_regset *regset, - unsigned int pos, unsigned int count, - const void *kbuf, const void __user *ubuf) -{ - int ret; - void __user *tls = target->thread.tls_ptr; - - ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1); - if (ret) - return ret; - - target->thread.tls_ptr = tls; - return ret; -} - -enum metag_regset { - REGSET_GENERAL, - REGSET_CBUF, - REGSET_READPIPE, - REGSET_TLS, -}; - -static const struct user_regset metag_regsets[] = { - [REGSET_GENERAL] = { - .core_note_type = NT_PRSTATUS, - .n = ELF_NGREG, - .size = sizeof(long), - .align = sizeof(long long), - .get = metag_gp_regs_get, - .set = metag_gp_regs_set, - }, - [REGSET_CBUF] = { - .core_note_type = NT_METAG_CBUF, - .n = sizeof(struct user_cb_regs) / sizeof(long), - .size = sizeof(long), - .align = sizeof(long long), - .get = metag_cb_regs_get, - .set = metag_cb_regs_set, - }, - [REGSET_READPIPE] = { - .core_note_type = NT_METAG_RPIPE, - .n = sizeof(struct user_rp_state) / sizeof(long), - .size = sizeof(long), - .align = sizeof(long long), - .get = metag_rp_state_get, - .set = metag_rp_state_set, - }, - [REGSET_TLS] = { - .core_note_type = NT_METAG_TLS, - .n = 1, - .size = sizeof(void *), - .align = sizeof(void *), - .get = metag_tls_get, - .set = metag_tls_set, - }, -}; - -static const struct user_regset_view user_metag_view = { - .name = "metag", - .e_machine = EM_METAG, - .regsets = metag_regsets, - .n = ARRAY_SIZE(metag_regsets) -}; - -const struct user_regset_view *task_user_regset_view(struct task_struct *task) -{ - return &user_metag_view; -} - -/* - * Called by kernel/ptrace.c when detaching.. - * - * Make sure single step bits etc are not set. - */ -void ptrace_disable(struct task_struct *child) -{ - /* nothing to do.. */ -} - -long arch_ptrace(struct task_struct *child, long request, unsigned long addr, - unsigned long data) -{ - int ret; - - switch (request) { - default: - ret = ptrace_request(child, request, addr, data); - break; - } - - return ret; -} - -int syscall_trace_enter(struct pt_regs *regs) -{ - int ret = 0; - - if (test_thread_flag(TIF_SYSCALL_TRACE)) - ret = tracehook_report_syscall_entry(regs); - - if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) - trace_sys_enter(regs, regs->ctx.DX[0].U1); - - return ret ? -1 : regs->ctx.DX[0].U1; -} - -void syscall_trace_leave(struct pt_regs *regs) -{ - if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) - trace_sys_exit(regs, regs->ctx.DX[0].U1); - - if (test_thread_flag(TIF_SYSCALL_TRACE)) - tracehook_report_syscall_exit(regs, 0); -} diff --git a/arch/metag/kernel/setup.c b/arch/metag/kernel/setup.c deleted file mode 100644 index 1166f1fbfd63..000000000000 --- a/arch/metag/kernel/setup.c +++ /dev/null @@ -1,622 +0,0 @@ -/* - * Copyright (C) 2005-2012 Imagination Technologies Ltd. - * - * This file contains the architecture-dependant parts of system setup. - * - */ - -#include <linux/export.h> -#include <linux/bootmem.h> -#include <linux/console.h> -#include <linux/cpu.h> -#include <linux/delay.h> -#include <linux/errno.h> -#include <linux/fs.h> -#include <linux/genhd.h> -#include <linux/init.h> -#include <linux/initrd.h> -#include <linux/interrupt.h> -#include <linux/kernel.h> -#include <linux/memblock.h> -#include <linux/mm.h> -#include <linux/of_fdt.h> -#include <linux/pfn.h> -#include <linux/root_dev.h> -#include <linux/sched.h> -#include <linux/seq_file.h> -#include <linux/start_kernel.h> -#include <linux/string.h> - -#include <asm/cachepart.h> -#include <asm/clock.h> -#include <asm/core_reg.h> -#include <asm/cpu.h> -#include <asm/da.h> -#include <asm/highmem.h> -#include <asm/hwthread.h> -#include <asm/l2cache.h> -#include <asm/mach/arch.h> -#include <asm/metag_mem.h> -#include <asm/metag_regs.h> -#include <asm/mmu.h> -#include <asm/mmzone.h> -#include <asm/processor.h> -#include <asm/sections.h> -#include <asm/setup.h> -#include <asm/traps.h> - -/* Priv protect as many registers as possible. */ -#define DEFAULT_PRIV (TXPRIVEXT_COPRO_BITS | \ - TXPRIVEXT_TXTRIGGER_BIT | \ - TXPRIVEXT_TXGBLCREG_BIT | \ - TXPRIVEXT_ILOCK_BIT | \ - TXPRIVEXT_TXITACCYC_BIT | \ - TXPRIVEXT_TXDIVTIME_BIT | \ - TXPRIVEXT_TXAMAREGX_BIT | \ - TXPRIVEXT_TXTIMERI_BIT | \ - TXPRIVEXT_TXSTATUS_BIT | \ - TXPRIVEXT_TXDISABLE_BIT) - -/* Meta2 specific bits. */ -#ifdef CONFIG_METAG_META12 -#define META2_PRIV 0 -#else -#define META2_PRIV (TXPRIVEXT_TXTIMER_BIT | \ - TXPRIVEXT_TRACE_BIT) -#endif - -/* Unaligned access checking bits. */ -#ifdef CONFIG_METAG_UNALIGNED -#define UNALIGNED_PRIV TXPRIVEXT_ALIGNREW_BIT -#else -#define UNALIGNED_PRIV 0 -#endif - -#define PRIV_BITS (DEFAULT_PRIV | \ - META2_PRIV | \ - UNALIGNED_PRIV) - -/* - * Protect access to: - * 0x06000000-0x07ffffff Direct mapped region - * 0x05000000-0x05ffffff MMU table region (Meta1) - * 0x04400000-0x047fffff Cache flush region - * 0x84000000-0x87ffffff Core cache memory region (Meta2) - * - * Allow access to: - * 0x80000000-0x81ffffff Core code memory region (Meta2) - */ -#ifdef CONFIG_METAG_META12 -#define PRIVSYSR_BITS TXPRIVSYSR_ALL_BITS -#else -#define PRIVSYSR_BITS (TXPRIVSYSR_ALL_BITS & ~TXPRIVSYSR_CORECODE_BIT) -#endif - -/* Protect all 0x02xxxxxx and 0x048xxxxx. */ -#define PIOREG_BITS 0xffffffff - -/* - * Protect all 0x04000xx0 (system events) - * except write combiner flush and write fence (system events 4 and 5). - */ -#define PSYREG_BITS 0xfffffffb - - -extern char _heap_start[]; - -#ifdef CONFIG_DA_CONSOLE -/* Our early channel based console driver */ -extern struct console dash_console; -#endif - -const struct machine_desc *machine_desc __initdata; - -/* - * Map a Linux CPU number to a hardware thread ID - * In SMP this will be setup with the correct mapping at startup; in UP this - * will map to the HW thread on which we are running. - */ -u8 cpu_2_hwthread_id[NR_CPUS] __read_mostly = { - [0 ... NR_CPUS-1] = BAD_HWTHREAD_ID -}; -EXPORT_SYMBOL_GPL(cpu_2_hwthread_id); - -/* - * Map a hardware thread ID to a Linux CPU number - * In SMP this will be fleshed out with the correct CPU ID for a particular - * hardware thread. In UP this will be initialised with the boot CPU ID. - */ -u8 hwthread_id_2_cpu[4] __read_mostly = { - [0 ... 3] = BAD_CPU_ID -}; - -/* The relative offset of the MMU mapped memory (from ldlk or bootloader) - * to the real physical memory. This is needed as we have to use the - * physical addresses in the MMU tables (pte entries), and not the virtual - * addresses. - * This variable is used in the __pa() and __va() macros, and should - * probably only be used via them. - */ -unsigned int meta_memoffset; -EXPORT_SYMBOL(meta_memoffset); - -static char __initdata *original_cmd_line; - -DEFINE_PER_CPU(PTBI, pTBI); - -/* - * Mapping are specified as "CPU_ID:HWTHREAD_ID", e.g. - * - * "hwthread_map=0:1,1:2,2:3,3:0" - * - * Linux CPU ID HWTHREAD_ID - * --------------------------- - * 0 1 - * 1 2 - * 2 3 - * 3 0 - */ -static int __init parse_hwthread_map(char *p) -{ - int cpu; - - while (*p) { - cpu = (*p++) - '0'; - if (cpu < 0 || cpu > 9) - goto err_cpu; - - p++; /* skip semi-colon */ - cpu_2_hwthread_id[cpu] = (*p++) - '0'; - if (cpu_2_hwthread_id[cpu] >= 4) - goto err_thread; - hwthread_id_2_cpu[cpu_2_hwthread_id[cpu]] = cpu; - - if (*p == ',') - p++; /* skip comma */ - } - - return 0; -err_cpu: - pr_err("%s: hwthread_map cpu argument out of range\n", __func__); - return -EINVAL; -err_thread: - pr_err("%s: hwthread_map thread argument out of range\n", __func__); - return -EINVAL; -} -early_param("hwthread_map", parse_hwthread_map); - -void __init dump_machine_table(void) -{ - struct machine_desc *p; - const char **compat; - - pr_info("Available machine support:\n\tNAME\t\tCOMPATIBLE LIST\n"); - for_each_machine_desc(p) { - pr_info("\t%s\t[", p->name); - for (compat = p->dt_compat; compat && *compat; ++compat) - printk(" '%s'", *compat); - printk(" ]\n"); - } - - pr_info("\nPlease check your kernel config and/or bootloader.\n"); - - hard_processor_halt(HALT_PANIC); -} - -#ifdef CONFIG_METAG_HALT_ON_PANIC -static int metag_panic_event(struct notifier_block *this, unsigned long event, - void *ptr) -{ - hard_processor_halt(HALT_PANIC); - return NOTIFY_DONE; -} - -static struct notifier_block metag_panic_block = { - metag_panic_event, - NULL, - 0 -}; -#endif - -void __init setup_arch(char **cmdline_p) -{ - unsigned long start_pfn; - unsigned long text_start = (unsigned long)(&_stext); - unsigned long cpu = smp_processor_id(); - unsigned long heap_start, heap_end; - unsigned long start_pte; - PTBI _pTBI; - PTBISEG p_heap; - int heap_id, i; - - metag_cache_probe(); - - metag_da_probe(); -#ifdef CONFIG_DA_CONSOLE - if (metag_da_enabled()) { - /* An early channel based console driver */ - register_console(&dash_console); - add_preferred_console("ttyDA", 1, NULL); - } -#endif - - /* try interpreting the argument as a device tree */ - machine_desc = setup_machine_fdt(original_cmd_line); - /* if it doesn't look like a device tree it must be a command line */ - if (!machine_desc) { -#ifdef CONFIG_METAG_BUILTIN_DTB - /* try the embedded device tree */ - machine_desc = setup_machine_fdt(__dtb_start); - if (!machine_desc) - panic("Invalid embedded device tree."); -#else - /* use the default machine description */ - machine_desc = default_machine_desc(); -#endif -#ifndef CONFIG_CMDLINE_FORCE - /* append the bootloader cmdline to any builtin fdt cmdline */ - if (boot_command_line[0] && original_cmd_line[0]) - strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); - strlcat(boot_command_line, original_cmd_line, - COMMAND_LINE_SIZE); -#endif - } - setup_meta_clocks(machine_desc->clocks); - - *cmdline_p = boot_command_line; - parse_early_param(); - - /* - * Make sure we don't alias in dcache or icache - */ - check_for_cache_aliasing(cpu); - - -#ifdef CONFIG_METAG_HALT_ON_PANIC - atomic_notifier_chain_register(&panic_notifier_list, - &metag_panic_block); -#endif - -#ifdef CONFIG_DUMMY_CONSOLE - conswitchp = &dummy_con; -#endif - - if (!(__core_reg_get(TXSTATUS) & TXSTATUS_PSTAT_BIT)) - panic("Privilege must be enabled for this thread."); - - _pTBI = __TBI(TBID_ISTAT_BIT); - - per_cpu(pTBI, cpu) = _pTBI; - - if (!per_cpu(pTBI, cpu)) - panic("No TBI found!"); - - /* - * Initialize all interrupt vectors to our copy of __TBIUnExpXXX, - * rather than the version from the bootloader. This makes call - * stacks easier to understand and may allow us to unmap the - * bootloader at some point. - */ - for (i = 0; i <= TBID_SIGNUM_MAX; i++) - _pTBI->fnSigs[i] = __TBIUnExpXXX; - - /* A Meta requirement is that the kernel is loaded (virtually) - * at the PAGE_OFFSET. - */ - if (PAGE_OFFSET != text_start) - panic("Kernel not loaded at PAGE_OFFSET (%#x) but at %#lx.", - PAGE_OFFSET, text_start); - - start_pte = mmu_read_second_level_page(text_start); - - /* - * Kernel pages should have the PRIV bit set by the bootloader. - */ - if (!(start_pte & _PAGE_KERNEL)) - panic("kernel pte does not have PRIV set"); - - /* - * See __pa and __va in include/asm/page.h. - * This value is negative when running in local space but the - * calculations work anyway. - */ - meta_memoffset = text_start - (start_pte & PAGE_MASK); - - /* Now lets look at the heap space */ - heap_id = (__TBIThreadId() & TBID_THREAD_BITS) - + TBID_SEG(0, TBID_SEGSCOPE_LOCAL, TBID_SEGTYPE_HEAP); - - p_heap = __TBIFindSeg(NULL, heap_id); - - if (!p_heap) - panic("Could not find heap from TBI!"); - - /* The heap begins at the first full page after the kernel data. */ - heap_start = (unsigned long) &_heap_start; - - /* The heap ends at the end of the heap segment specified with - * ldlk. - */ - if (is_global_space(text_start)) { - pr_debug("WARNING: running in global space!\n"); - heap_end = (unsigned long)p_heap->pGAddr + p_heap->Bytes; - } else { - heap_end = (unsigned long)p_heap->pLAddr + p_heap->Bytes; - } - - ROOT_DEV = Root_RAM0; - - /* init_mm is the mm struct used for the first task. It is then - * cloned for all other tasks spawned from that task. - * - * Note - we are using the virtual addresses here. - */ - init_mm.start_code = (unsigned long)(&_stext); - init_mm.end_code = (unsigned long)(&_etext); - init_mm.end_data = (unsigned long)(&_edata); - init_mm.brk = (unsigned long)heap_start; - - min_low_pfn = PFN_UP(__pa(text_start)); - max_low_pfn = PFN_DOWN(__pa(heap_end)); - - pfn_base = min_low_pfn; - - /* Round max_pfn up to a 4Mb boundary. The free_bootmem_node() - * call later makes sure to keep the rounded up pages marked reserved. - */ - max_pfn = max_low_pfn + ((1 << MAX_ORDER) - 1); - max_pfn &= ~((1 << MAX_ORDER) - 1); - - start_pfn = PFN_UP(__pa(heap_start)); - - if (min_low_pfn & ((1 << MAX_ORDER) - 1)) { - /* Theoretically, we could expand the space that the - * bootmem allocator covers - much as we do for the - * 'high' address, and then tell the bootmem system - * that the lowest chunk is 'not available'. Right - * now it is just much easier to constrain the - * user to always MAX_ORDER align their kernel space. - */ - - panic("Kernel must be %d byte aligned, currently at %#lx.", - 1 << (MAX_ORDER + PAGE_SHIFT), - min_low_pfn << PAGE_SHIFT); - } - -#ifdef CONFIG_HIGHMEM - highstart_pfn = highend_pfn = max_pfn; - high_memory = (void *) __va(PFN_PHYS(highstart_pfn)); -#else - high_memory = (void *)__va(PFN_PHYS(max_pfn)); -#endif - - paging_init(heap_end); - - setup_priv(); - - /* Setup the boot cpu's mapping. The rest will be setup below. */ - cpu_2_hwthread_id[smp_processor_id()] = hard_processor_id(); - hwthread_id_2_cpu[hard_processor_id()] = smp_processor_id(); - - unflatten_and_copy_device_tree(); - -#ifdef CONFIG_SMP - smp_init_cpus(); -#endif - - if (machine_desc->init_early) - machine_desc->init_early(); -} - -static int __init customize_machine(void) -{ - /* customizes platform devices, or adds new ones */ - if (machine_desc->init_machine) - machine_desc->init_machine(); - - return 0; -} -arch_initcall(customize_machine); - -static int __init init_machine_late(void) -{ - if (machine_desc->init_late) - machine_desc->init_late(); - return 0; -} -late_initcall(init_machine_late); - -#ifdef CONFIG_PROC_FS -/* - * Get CPU information for use by the procfs. - */ -static const char *get_cpu_capabilities(unsigned int txenable) -{ -#ifdef CONFIG_METAG_META21 - /* See CORE_ID in META HTP.GP TRM - Architecture Overview 2.1.238 */ - int coreid = metag_in32(METAC_CORE_ID); - unsigned int dsp_type = (coreid >> 3) & 7; - unsigned int fpu_type = (coreid >> 7) & 3; - - switch (dsp_type | fpu_type << 3) { - case (0x00): return "EDSP"; - case (0x01): return "DSP"; - case (0x08): return "EDSP+LFPU"; - case (0x09): return "DSP+LFPU"; - case (0x10): return "EDSP+FPU"; - case (0x11): return "DSP+FPU"; - } - return "UNKNOWN"; - -#else - if (!(txenable & TXENABLE_CLASS_BITS)) - return "DSP"; - else - return ""; -#endif -} - -static int show_cpuinfo(struct seq_file *m, void *v) -{ - const char *cpu; - unsigned int txenable, thread_id, major, minor; - unsigned long clockfreq = get_coreclock(); -#ifdef CONFIG_SMP - int i; - unsigned long lpj; -#endif - - cpu = "META"; - - txenable = __core_reg_get(TXENABLE); - major = (txenable & TXENABLE_MAJOR_REV_BITS) >> TXENABLE_MAJOR_REV_S; - minor = (txenable & TXENABLE_MINOR_REV_BITS) >> TXENABLE_MINOR_REV_S; - thread_id = (txenable >> 8) & 0x3; - -#ifdef CONFIG_SMP - for_each_online_cpu(i) { - lpj = per_cpu(cpu_data, i).loops_per_jiffy; - txenable = core_reg_read(TXUCT_ID, TXENABLE_REGNUM, - cpu_2_hwthread_id[i]); - - seq_printf(m, "CPU:\t\t%s %d.%d (thread %d)\n" - "Clocking:\t%lu.%1luMHz\n" - "BogoMips:\t%lu.%02lu\n" - "Calibration:\t%lu loops\n" - "Capabilities:\t%s\n\n", - cpu, major, minor, i, - clockfreq / 1000000, (clockfreq / 100000) % 10, - lpj / (500000 / HZ), (lpj / (5000 / HZ)) % 100, - lpj, - get_cpu_capabilities(txenable)); - } -#else - seq_printf(m, "CPU:\t\t%s %d.%d (thread %d)\n" - "Clocking:\t%lu.%1luMHz\n" - "BogoMips:\t%lu.%02lu\n" - "Calibration:\t%lu loops\n" - "Capabilities:\t%s\n", - cpu, major, minor, thread_id, - clockfreq / 1000000, (clockfreq / 100000) % 10, - loops_per_jiffy / (500000 / HZ), - (loops_per_jiffy / (5000 / HZ)) % 100, - loops_per_jiffy, - get_cpu_capabilities(txenable)); -#endif /* CONFIG_SMP */ - -#ifdef CONFIG_METAG_L2C - if (meta_l2c_is_present()) { - seq_printf(m, "L2 cache:\t%s\n" - "L2 cache size:\t%d KB\n", - meta_l2c_is_enabled() ? "enabled" : "disabled", - meta_l2c_size() >> 10); - } -#endif - return 0; -} - -static void *c_start(struct seq_file *m, loff_t *pos) -{ - return (void *)(*pos == 0); -} -static void *c_next(struct seq_file *m, void *v, loff_t *pos) -{ - return NULL; -} -static void c_stop(struct seq_file *m, void *v) -{ -} -const struct seq_operations cpuinfo_op = { - .start = c_start, - .next = c_next, - .stop = c_stop, - .show = show_cpuinfo, -}; -#endif /* CONFIG_PROC_FS */ - -void __init metag_start_kernel(char *args) -{ - /* Zero the timer register so timestamps are from the point at - * which the kernel started running. - */ - __core_reg_set(TXTIMER, 0); - - /* Clear the bss. */ - memset(__bss_start, 0, - (unsigned long)__bss_stop - (unsigned long)__bss_start); - - /* Remember where these are for use in setup_arch */ - original_cmd_line = args; - - current_thread_info()->cpu = hard_processor_id(); - - start_kernel(); -} - -/** - * setup_priv() - Set up privilege protection registers. - * - * Set up privilege protection registers such as TXPRIVEXT to prevent userland - * from touching our precious registers and sensitive memory areas. - */ -void setup_priv(void) -{ - unsigned int offset = hard_processor_id() << TXPRIVREG_STRIDE_S; - - __core_reg_set(TXPRIVEXT, PRIV_BITS); - - metag_out32(PRIVSYSR_BITS, T0PRIVSYSR + offset); - metag_out32(PIOREG_BITS, T0PIOREG + offset); - metag_out32(PSYREG_BITS, T0PSYREG + offset); -} - -PTBI pTBI_get(unsigned int cpu) -{ - return per_cpu(pTBI, cpu); -} -EXPORT_SYMBOL(pTBI_get); - -#if defined(CONFIG_METAG_DSP) && defined(CONFIG_METAG_FPU) -static char capabilities[] = "dsp fpu"; -#elif defined(CONFIG_METAG_DSP) -static char capabilities[] = "dsp"; -#elif defined(CONFIG_METAG_FPU) -static char capabilities[] = "fpu"; -#else -static char capabilities[] = ""; -#endif - -static struct ctl_table caps_kern_table[] = { - { - .procname = "capabilities", - .data = capabilities, - .maxlen = sizeof(capabilities), - .mode = 0444, - .proc_handler = proc_dostring, - }, - {} -}; - -static struct ctl_table caps_root_table[] = { - { - .procname = "kernel", - .mode = 0555, - .child = caps_kern_table, - }, - {} -}; - -static int __init capabilities_register_sysctl(void) -{ - struct ctl_table_header *caps_table_header; - - caps_table_header = register_sysctl_table(caps_root_table); - if (!caps_table_header) { - pr_err("Unable to register CAPABILITIES sysctl\n"); - return -ENOMEM; - } - - return 0; -} - -core_initcall(capabilities_register_sysctl); diff --git a/arch/metag/kernel/signal.c b/arch/metag/kernel/signal.c deleted file mode 100644 index e64e8b0a9363..000000000000 --- a/arch/metag/kernel/signal.c +++ /dev/null @@ -1,336 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 1991,1992 Linus Torvalds - * Copyright (C) 2005-2012 Imagination Technologies Ltd. - * - * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson - * - */ - -#include <linux/sched.h> -#include <linux/sched/task_stack.h> -#include <linux/mm.h> -#include <linux/smp.h> -#include <linux/kernel.h> -#include <linux/signal.h> -#include <linux/errno.h> -#include <linux/wait.h> -#include <linux/ptrace.h> -#include <linux/unistd.h> -#include <linux/stddef.h> -#include <linux/personality.h> -#include <linux/uaccess.h> -#include <linux/tracehook.h> - -#include <asm/ucontext.h> -#include <asm/cacheflush.h> -#include <asm/switch.h> -#include <asm/syscall.h> -#include <asm/syscalls.h> - -#define REG_FLAGS ctx.SaveMask -#define REG_RETVAL ctx.DX[0].U0 -#define REG_SYSCALL ctx.DX[0].U1 -#define REG_SP ctx.AX[0].U0 -#define REG_ARG1 ctx.DX[3].U1 -#define REG_ARG2 ctx.DX[3].U0 -#define REG_ARG3 ctx.DX[2].U1 -#define REG_PC ctx.CurrPC -#define REG_RTP ctx.DX[4].U1 - -struct rt_sigframe { - struct siginfo info; - struct ucontext uc; - unsigned long retcode[2]; -}; - -static int restore_sigcontext(struct pt_regs *regs, - struct sigcontext __user *sc) -{ - int err; - - /* Always make any pending restarted system calls return -EINTR */ - current->restart_block.fn = do_no_restart_syscall; - - err = metag_gp_regs_copyin(regs, 0, sizeof(struct user_gp_regs), NULL, - &sc->regs); - if (!err) - err = metag_cb_regs_copyin(regs, 0, - sizeof(struct user_cb_regs), NULL, - &sc->cb); - if (!err) - err = metag_rp_state_copyin(regs, 0, - sizeof(struct user_rp_state), NULL, - &sc->rp); - - /* This is a user-mode context. */ - regs->REG_FLAGS |= TBICTX_PRIV_BIT; - - return err; -} - -long sys_rt_sigreturn(void) -{ - /* NOTE - Meta stack goes UPWARDS - so we wind the stack back */ - struct pt_regs *regs = current_pt_regs(); - struct rt_sigframe __user *frame; - sigset_t set; - - frame = (__force struct rt_sigframe __user *)(regs->REG_SP - - sizeof(*frame)); - - if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) - goto badframe; - - if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) - goto badframe; - - set_current_blocked(&set); - - if (restore_sigcontext(regs, &frame->uc.uc_mcontext)) - goto badframe; - - if (restore_altstack(&frame->uc.uc_stack)) - goto badframe; - - return regs->REG_RETVAL; - -badframe: - force_sig(SIGSEGV, current); - - return 0; -} - -static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, - unsigned long mask) -{ - int err; - - err = metag_gp_regs_copyout(regs, 0, sizeof(struct user_gp_regs), NULL, - &sc->regs); - - if (!err) - err = metag_cb_regs_copyout(regs, 0, - sizeof(struct user_cb_regs), NULL, - &sc->cb); - if (!err) - err = metag_rp_state_copyout(regs, 0, - sizeof(struct user_rp_state), NULL, - &sc->rp); - - /* OK, clear that cbuf flag in the old context, or our stored - * catch buffer will be restored when we go to call the signal - * handler. Also clear out the CBRP RA/RD pipe bit incase - * that is pending as well! - * Note that as we have already stored this context, these - * flags will get restored on sigreturn to their original - * state. - */ - regs->REG_FLAGS &= ~(TBICTX_XCBF_BIT | TBICTX_CBUF_BIT | - TBICTX_CBRP_BIT); - - /* Clear out the LSM_STEP bits in case we are in the middle of - * and MSET/MGET. - */ - regs->ctx.Flags &= ~TXSTATUS_LSM_STEP_BITS; - - err |= __put_user(mask, &sc->oldmask); - - return err; -} - -/* - * Determine which stack to use.. - */ -static void __user *get_sigframe(struct ksignal *ksig, unsigned long sp) -{ - sp = sigsp(sp, ksig); - sp = (sp + 7) & ~7; /* 8byte align stack */ - - return (void __user *)sp; -} - -static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, - struct pt_regs *regs) -{ - struct rt_sigframe __user *frame; - int err; - unsigned long code; - - frame = get_sigframe(ksig, regs->REG_SP); - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - return -EFAULT; - - err = copy_siginfo_to_user(&frame->info, &ksig->info); - - /* Create the ucontext. */ - err |= __put_user(0, &frame->uc.uc_flags); - err |= __put_user(0, (unsigned long __user *)&frame->uc.uc_link); - err |= __save_altstack(&frame->uc.uc_stack, regs->REG_SP); - err |= setup_sigcontext(&frame->uc.uc_mcontext, - regs, set->sig[0]); - err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); - - if (err) - return -EFAULT; - - /* Set up to return from userspace. */ - - /* MOV D1Re0 (D1.0), #__NR_rt_sigreturn */ - code = 0x03000004 | (__NR_rt_sigreturn << 3); - err |= __put_user(code, (unsigned long __user *)(&frame->retcode[0])); - - /* SWITCH #__METAG_SW_SYS */ - code = __METAG_SW_ENCODING(SYS); - err |= __put_user(code, (unsigned long __user *)(&frame->retcode[1])); - - if (err) - return -EFAULT; - - /* Set up registers for signal handler */ - regs->REG_RTP = (unsigned long) frame->retcode; - regs->REG_SP = (unsigned long) frame + sizeof(*frame); - regs->REG_ARG1 = ksig->sig; - regs->REG_ARG2 = (unsigned long) &frame->info; - regs->REG_ARG3 = (unsigned long) &frame->uc; - regs->REG_PC = (unsigned long) ksig->ka.sa.sa_handler; - - pr_debug("SIG deliver (%s:%d): sp=%p pc=%08x pr=%08x\n", - current->comm, current->pid, frame, regs->REG_PC, - regs->REG_RTP); - - /* Now pass size of 'new code' into sigtramp so we can do a more - * effective cache flush - directed rather than 'full flush'. - */ - flush_cache_sigtramp(regs->REG_RTP, sizeof(frame->retcode)); - - return 0; -} - -static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) -{ - sigset_t *oldset = sigmask_to_save(); - int ret; - - /* Set up the stack frame */ - ret = setup_rt_frame(ksig, oldset, regs); - - signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP)); -} - - /* - * Notes for Meta. - * We have moved from the old 2.4.9 SH way of using syscall_nr (in the stored - * context) to passing in the syscall flag on the stack. - * This is because having syscall_nr in our context does not fit with TBX, and - * corrupted the stack. - */ -static int do_signal(struct pt_regs *regs, int syscall) -{ - unsigned int retval = 0, continue_addr = 0, restart_addr = 0; - int restart = 0; - struct ksignal ksig; - - /* - * By the end of rt_sigreturn the context describes the point that the - * signal was taken (which may happen to be just before a syscall if - * it's already been restarted). This should *never* be mistaken for a - * system call in need of restarting. - */ - if (syscall == __NR_rt_sigreturn) - syscall = -1; - - /* Did we come from a system call? */ - if (syscall >= 0) { - continue_addr = regs->REG_PC; - restart_addr = continue_addr - 4; - retval = regs->REG_RETVAL; - - /* - * Prepare for system call restart. We do this here so that a - * debugger will see the already changed PC. - */ - switch (retval) { - case -ERESTART_RESTARTBLOCK: - restart = -2; - case -ERESTARTNOHAND: - case -ERESTARTSYS: - case -ERESTARTNOINTR: - ++restart; - regs->REG_PC = restart_addr; - break; - } - } - - /* - * Get the signal to deliver. When running under ptrace, at this point - * the debugger may change all our registers ... - */ - get_signal(&ksig); - - /* - * Depending on the signal settings we may need to revert the decision - * to restart the system call. But skip this if a debugger has chosen to - * restart at a different PC. - */ - if (regs->REG_PC != restart_addr) - restart = 0; - if (ksig.sig > 0) { - if (unlikely(restart)) { - if (retval == -ERESTARTNOHAND - || retval == -ERESTART_RESTARTBLOCK - || (retval == -ERESTARTSYS - && !(ksig.ka.sa.sa_flags & SA_RESTART))) { - regs->REG_RETVAL = -EINTR; - regs->REG_PC = continue_addr; - } - } - - /* Whee! Actually deliver the signal. */ - handle_signal(&ksig, regs); - return 0; - } - - /* Handlerless -ERESTART_RESTARTBLOCK re-enters via restart_syscall */ - if (unlikely(restart < 0)) - regs->REG_SYSCALL = __NR_restart_syscall; - - /* - * If there's no signal to deliver, we just put the saved sigmask back. - */ - restore_saved_sigmask(); - - return restart; -} - -int do_work_pending(struct pt_regs *regs, unsigned int thread_flags, - int syscall) -{ - do { - if (likely(thread_flags & _TIF_NEED_RESCHED)) { - schedule(); - } else { - if (unlikely(!user_mode(regs))) - return 0; - local_irq_enable(); - if (thread_flags & _TIF_SIGPENDING) { - int restart = do_signal(regs, syscall); - if (unlikely(restart)) { - /* - * Restart without handlers. - * Deal with it without leaving - * the kernel space. - */ - return restart; - } - syscall = -1; - } else { - clear_thread_flag(TIF_NOTIFY_RESUME); - tracehook_notify_resume(regs); - } - } - local_irq_disable(); - thread_flags = current_thread_info()->flags; - } while (thread_flags & _TIF_WORK_MASK); - return 0; -} diff --git a/arch/metag/kernel/smp.c b/arch/metag/kernel/smp.c deleted file mode 100644 index 2dbbb7c66043..000000000000 --- a/arch/metag/kernel/smp.c +++ /dev/null @@ -1,668 +0,0 @@ -/* - * Copyright (C) 2009,2010,2011 Imagination Technologies Ltd. - * - * Copyright (C) 2002 ARM Limited, All Rights Reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#include <linux/atomic.h> -#include <linux/completion.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/sched/mm.h> -#include <linux/sched/hotplug.h> -#include <linux/sched/task_stack.h> -#include <linux/interrupt.h> -#include <linux/cache.h> -#include <linux/profile.h> -#include <linux/errno.h> -#include <linux/mm.h> -#include <linux/err.h> -#include <linux/cpu.h> -#include <linux/smp.h> -#include <linux/seq_file.h> -#include <linux/irq.h> -#include <linux/bootmem.h> - -#include <asm/cacheflush.h> -#include <asm/cachepart.h> -#include <asm/core_reg.h> -#include <asm/cpu.h> -#include <asm/global_lock.h> -#include <asm/metag_mem.h> -#include <asm/mmu_context.h> -#include <asm/pgtable.h> -#include <asm/pgalloc.h> -#include <asm/processor.h> -#include <asm/setup.h> -#include <asm/tlbflush.h> -#include <asm/hwthread.h> -#include <asm/traps.h> - -#define SYSC_DCPART(n) (SYSC_DCPART0 + SYSC_xCPARTn_STRIDE * (n)) -#define SYSC_ICPART(n) (SYSC_ICPART0 + SYSC_xCPARTn_STRIDE * (n)) - -DECLARE_PER_CPU(PTBI, pTBI); - -void *secondary_data_stack; - -/* - * structures for inter-processor calls - * - A collection of single bit ipi messages. - */ -struct ipi_data { - spinlock_t lock; - unsigned long ipi_count; - unsigned long bits; -}; - -static DEFINE_PER_CPU(struct ipi_data, ipi_data) = { - .lock = __SPIN_LOCK_UNLOCKED(ipi_data.lock), -}; - -static DEFINE_SPINLOCK(boot_lock); - -static DECLARE_COMPLETION(cpu_running); - -/* - * "thread" is assumed to be a valid Meta hardware thread ID. - */ -static int boot_secondary(unsigned int thread, struct task_struct *idle) -{ - u32 val; - - /* - * set synchronisation state between this boot processor - * and the secondary one - */ - spin_lock(&boot_lock); - - core_reg_write(TXUPC_ID, 0, thread, (unsigned int)secondary_startup); - core_reg_write(TXUPC_ID, 1, thread, 0); - - /* - * Give the thread privilege (PSTAT) and clear potentially problematic - * bits in the process (namely ISTAT, CBMarker, CBMarkerI, LSM_STEP). - */ - core_reg_write(TXUCT_ID, TXSTATUS_REGNUM, thread, TXSTATUS_PSTAT_BIT); - - /* Clear the minim enable bit. */ - val = core_reg_read(TXUCT_ID, TXPRIVEXT_REGNUM, thread); - core_reg_write(TXUCT_ID, TXPRIVEXT_REGNUM, thread, val & ~0x80); - - /* - * set the ThreadEnable bit (0x1) in the TXENABLE register - * for the specified thread - off it goes! - */ - val = core_reg_read(TXUCT_ID, TXENABLE_REGNUM, thread); - core_reg_write(TXUCT_ID, TXENABLE_REGNUM, thread, val | 0x1); - - /* - * now the secondary core is starting up let it run its - * calibrations, then wait for it to finish - */ - spin_unlock(&boot_lock); - - return 0; -} - -/** - * describe_cachepart_change: describe a change to cache partitions. - * @thread: Hardware thread number. - * @label: Label of cache type, e.g. "dcache" or "icache". - * @sz: Total size of the cache. - * @old: Old cache partition configuration (*CPART* register). - * @new: New cache partition configuration (*CPART* register). - * - * If the cache partition has changed, prints a message to the log describing - * those changes. - */ -static void describe_cachepart_change(unsigned int thread, const char *label, - unsigned int sz, unsigned int old, - unsigned int new) -{ - unsigned int lor1, land1, gor1, gand1; - unsigned int lor2, land2, gor2, gand2; - unsigned int diff = old ^ new; - - if (!diff) - return; - - pr_info("Thread %d: %s partition changed:", thread, label); - if (diff & (SYSC_xCPARTL_OR_BITS | SYSC_xCPARTL_AND_BITS)) { - lor1 = (old & SYSC_xCPARTL_OR_BITS) >> SYSC_xCPARTL_OR_S; - lor2 = (new & SYSC_xCPARTL_OR_BITS) >> SYSC_xCPARTL_OR_S; - land1 = (old & SYSC_xCPARTL_AND_BITS) >> SYSC_xCPARTL_AND_S; - land2 = (new & SYSC_xCPARTL_AND_BITS) >> SYSC_xCPARTL_AND_S; - pr_cont(" L:%#x+%#x->%#x+%#x", - (lor1 * sz) >> 4, - ((land1 + 1) * sz) >> 4, - (lor2 * sz) >> 4, - ((land2 + 1) * sz) >> 4); - } - if (diff & (SYSC_xCPARTG_OR_BITS | SYSC_xCPARTG_AND_BITS)) { - gor1 = (old & SYSC_xCPARTG_OR_BITS) >> SYSC_xCPARTG_OR_S; - gor2 = (new & SYSC_xCPARTG_OR_BITS) >> SYSC_xCPARTG_OR_S; - gand1 = (old & SYSC_xCPARTG_AND_BITS) >> SYSC_xCPARTG_AND_S; - gand2 = (new & SYSC_xCPARTG_AND_BITS) >> SYSC_xCPARTG_AND_S; - pr_cont(" G:%#x+%#x->%#x+%#x", - (gor1 * sz) >> 4, - ((gand1 + 1) * sz) >> 4, - (gor2 * sz) >> 4, - ((gand2 + 1) * sz) >> 4); - } - if (diff & SYSC_CWRMODE_BIT) - pr_cont(" %sWR", - (new & SYSC_CWRMODE_BIT) ? "+" : "-"); - if (diff & SYSC_DCPART_GCON_BIT) - pr_cont(" %sGCOn", - (new & SYSC_DCPART_GCON_BIT) ? "+" : "-"); - pr_cont("\n"); -} - -/** - * setup_smp_cache: ensure cache coherency for new SMP thread. - * @thread: New hardware thread number. - * - * Ensures that coherency is enabled and that the threads share the same cache - * partitions. - */ -static void setup_smp_cache(unsigned int thread) -{ - unsigned int this_thread, lflags; - unsigned int dcsz, dcpart_this, dcpart_old, dcpart_new; - unsigned int icsz, icpart_old, icpart_new; - - /* - * Copy over the current thread's cache partition configuration to the - * new thread so that they share cache partitions. - */ - __global_lock2(lflags); - this_thread = hard_processor_id(); - /* Share dcache partition */ - dcpart_this = metag_in32(SYSC_DCPART(this_thread)); - dcpart_old = metag_in32(SYSC_DCPART(thread)); - dcpart_new = dcpart_this; -#if PAGE_OFFSET < LINGLOBAL_BASE - /* - * For the local data cache to be coherent the threads must also have - * GCOn enabled. - */ - dcpart_new |= SYSC_DCPART_GCON_BIT; - metag_out32(dcpart_new, SYSC_DCPART(this_thread)); -#endif - metag_out32(dcpart_new, SYSC_DCPART(thread)); - /* Share icache partition too */ - icpart_new = metag_in32(SYSC_ICPART(this_thread)); - icpart_old = metag_in32(SYSC_ICPART(thread)); - metag_out32(icpart_new, SYSC_ICPART(thread)); - __global_unlock2(lflags); - - /* - * Log if the cache partitions were altered so the user is aware of any - * potential unintentional cache wastage. - */ - dcsz = get_dcache_size(); - icsz = get_dcache_size(); - describe_cachepart_change(this_thread, "dcache", dcsz, - dcpart_this, dcpart_new); - describe_cachepart_change(thread, "dcache", dcsz, - dcpart_old, dcpart_new); - describe_cachepart_change(thread, "icache", icsz, - icpart_old, icpart_new); -} - -int __cpu_up(unsigned int cpu, struct task_struct *idle) -{ - unsigned int thread = cpu_2_hwthread_id[cpu]; - int ret; - - load_pgd(swapper_pg_dir, thread); - - flush_tlb_all(); - - setup_smp_cache(thread); - - /* - * Tell the secondary CPU where to find its idle thread's stack. - */ - secondary_data_stack = task_stack_page(idle); - - wmb(); - - /* - * Now bring the CPU into our world. - */ - ret = boot_secondary(thread, idle); - if (ret == 0) { - /* - * CPU was successfully started, wait for it - * to come online or time out. - */ - wait_for_completion_timeout(&cpu_running, - msecs_to_jiffies(1000)); - - if (!cpu_online(cpu)) - ret = -EIO; - } - - secondary_data_stack = NULL; - - if (ret) { - pr_crit("CPU%u: processor failed to boot\n", cpu); - - /* - * FIXME: We need to clean up the new idle thread. --rmk - */ - } - - return ret; -} - -#ifdef CONFIG_HOTPLUG_CPU - -/* - * __cpu_disable runs on the processor to be shutdown. - */ -int __cpu_disable(void) -{ - unsigned int cpu = smp_processor_id(); - - /* - * Take this CPU offline. Once we clear this, we can't return, - * and we must not schedule until we're ready to give up the cpu. - */ - set_cpu_online(cpu, false); - - /* - * OK - migrate IRQs away from this CPU - */ - migrate_irqs(); - - /* - * Flush user cache and TLB mappings, and then remove this CPU - * from the vm mask set of all processes. - */ - flush_cache_all(); - local_flush_tlb_all(); - - clear_tasks_mm_cpumask(cpu); - - return 0; -} - -/* - * called on the thread which is asking for a CPU to be shutdown - - * waits until shutdown has completed, or it is timed out. - */ -void __cpu_die(unsigned int cpu) -{ - if (!cpu_wait_death(cpu, 1)) - pr_err("CPU%u: unable to kill\n", cpu); -} - -/* - * Called from the idle thread for the CPU which has been shutdown. - * - * Note that we do not return from this function. If this cpu is - * brought online again it will need to run secondary_startup(). - */ -void cpu_die(void) -{ - local_irq_disable(); - idle_task_exit(); - irq_ctx_exit(smp_processor_id()); - - (void)cpu_report_death(); - - asm ("XOR TXENABLE, D0Re0,D0Re0\n"); -} -#endif /* CONFIG_HOTPLUG_CPU */ - -/* - * Called by both boot and secondaries to move global data into - * per-processor storage. - */ -void smp_store_cpu_info(unsigned int cpuid) -{ - struct cpuinfo_metag *cpu_info = &per_cpu(cpu_data, cpuid); - - cpu_info->loops_per_jiffy = loops_per_jiffy; -} - -/* - * This is the secondary CPU boot entry. We're using this CPUs - * idle thread stack and the global page tables. - */ -asmlinkage void secondary_start_kernel(void) -{ - struct mm_struct *mm = &init_mm; - unsigned int cpu = smp_processor_id(); - - /* - * All kernel threads share the same mm context; grab a - * reference and switch to it. - */ - mmget(mm); - mmgrab(mm); - current->active_mm = mm; - cpumask_set_cpu(cpu, mm_cpumask(mm)); - enter_lazy_tlb(mm, current); - local_flush_tlb_all(); - - /* - * TODO: Some day it might be useful for each Linux CPU to - * have its own TBI structure. That would allow each Linux CPU - * to run different interrupt handlers for the same IRQ - * number. - * - * For now, simply copying the pointer to the boot CPU's TBI - * structure is sufficient because we always want to run the - * same interrupt handler whatever CPU takes the interrupt. - */ - per_cpu(pTBI, cpu) = __TBI(TBID_ISTAT_BIT); - - if (!per_cpu(pTBI, cpu)) - panic("No TBI found!"); - - per_cpu_trap_init(cpu); - irq_ctx_init(cpu); - - preempt_disable(); - - setup_priv(); - - notify_cpu_starting(cpu); - - pr_info("CPU%u (thread %u): Booted secondary processor\n", - cpu, cpu_2_hwthread_id[cpu]); - - calibrate_delay(); - smp_store_cpu_info(cpu); - - /* - * OK, now it's safe to let the boot CPU continue - */ - set_cpu_online(cpu, true); - complete(&cpu_running); - - /* - * Enable local interrupts. - */ - tbi_startup_interrupt(TBID_SIGNUM_TRT); - local_irq_enable(); - - /* - * OK, it's off to the idle thread for us - */ - cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); -} - -void __init smp_cpus_done(unsigned int max_cpus) -{ - int cpu; - unsigned long bogosum = 0; - - for_each_online_cpu(cpu) - bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy; - - pr_info("SMP: Total of %d processors activated (%lu.%02lu BogoMIPS).\n", - num_online_cpus(), - bogosum / (500000/HZ), - (bogosum / (5000/HZ)) % 100); -} - -void __init smp_prepare_cpus(unsigned int max_cpus) -{ - unsigned int cpu = smp_processor_id(); - - init_new_context(current, &init_mm); - current_thread_info()->cpu = cpu; - - smp_store_cpu_info(cpu); - init_cpu_present(cpu_possible_mask); -} - -void __init smp_prepare_boot_cpu(void) -{ - unsigned int cpu = smp_processor_id(); - - per_cpu(pTBI, cpu) = __TBI(TBID_ISTAT_BIT); - - if (!per_cpu(pTBI, cpu)) - panic("No TBI found!"); -} - -static void smp_cross_call(cpumask_t callmap, enum ipi_msg_type msg); - -static void send_ipi_message(const struct cpumask *mask, enum ipi_msg_type msg) -{ - unsigned long flags; - unsigned int cpu; - cpumask_t map; - - cpumask_clear(&map); - local_irq_save(flags); - - for_each_cpu(cpu, mask) { - struct ipi_data *ipi = &per_cpu(ipi_data, cpu); - - spin_lock(&ipi->lock); - - /* - * KICK interrupts are queued in hardware so we'll get - * multiple interrupts if we call smp_cross_call() - * multiple times for one msg. The problem is that we - * only have one bit for each message - we can't queue - * them in software. - * - * The first time through ipi_handler() we'll clear - * the msg bit, having done all the work. But when we - * return we'll get _another_ interrupt (and another, - * and another until we've handled all the queued - * KICKs). Running ipi_handler() when there's no work - * to do is bad because that's how kick handler - * chaining detects who the KICK was intended for. - * See arch/metag/kernel/kick.c for more details. - * - * So only add 'cpu' to 'map' if we haven't already - * queued a KICK interrupt for 'msg'. - */ - if (!(ipi->bits & (1 << msg))) { - ipi->bits |= 1 << msg; - cpumask_set_cpu(cpu, &map); - } - - spin_unlock(&ipi->lock); - } - - /* - * Call the platform specific cross-CPU call function. - */ - smp_cross_call(map, msg); - - local_irq_restore(flags); -} - -void arch_send_call_function_ipi_mask(const struct cpumask *mask) -{ - send_ipi_message(mask, IPI_CALL_FUNC); -} - -void arch_send_call_function_single_ipi(int cpu) -{ - send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC); -} - -void show_ipi_list(struct seq_file *p) -{ - unsigned int cpu; - - seq_puts(p, "IPI:"); - - for_each_present_cpu(cpu) - seq_printf(p, " %10lu", per_cpu(ipi_data, cpu).ipi_count); - - seq_putc(p, '\n'); -} - -static DEFINE_SPINLOCK(stop_lock); - -/* - * Main handler for inter-processor interrupts - * - * For Meta, the ipimask now only identifies a single - * category of IPI (Bit 1 IPIs have been replaced by a - * different mechanism): - * - * Bit 0 - Inter-processor function call - */ -static int do_IPI(void) -{ - unsigned int cpu = smp_processor_id(); - struct ipi_data *ipi = &per_cpu(ipi_data, cpu); - unsigned long msgs, nextmsg; - int handled = 0; - - ipi->ipi_count++; - - spin_lock(&ipi->lock); - msgs = ipi->bits; - nextmsg = msgs & -msgs; - ipi->bits &= ~nextmsg; - spin_unlock(&ipi->lock); - - if (nextmsg) { - handled = 1; - - nextmsg = ffz(~nextmsg); - switch (nextmsg) { - case IPI_RESCHEDULE: - scheduler_ipi(); - break; - - case IPI_CALL_FUNC: - generic_smp_call_function_interrupt(); - break; - - default: - pr_crit("CPU%u: Unknown IPI message 0x%lx\n", - cpu, nextmsg); - break; - } - } - - return handled; -} - -void smp_send_reschedule(int cpu) -{ - send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE); -} - -static void stop_this_cpu(void *data) -{ - unsigned int cpu = smp_processor_id(); - - if (system_state <= SYSTEM_RUNNING) { - spin_lock(&stop_lock); - pr_crit("CPU%u: stopping\n", cpu); - dump_stack(); - spin_unlock(&stop_lock); - } - - set_cpu_online(cpu, false); - - local_irq_disable(); - - hard_processor_halt(HALT_OK); -} - -void smp_send_stop(void) -{ - smp_call_function(stop_this_cpu, NULL, 0); -} - -/* - * not supported here - */ -int setup_profiling_timer(unsigned int multiplier) -{ - return -EINVAL; -} - -/* - * We use KICKs for inter-processor interrupts. - * - * For every CPU in "callmap" the IPI data must already have been - * stored in that CPU's "ipi_data" member prior to calling this - * function. - */ -static void kick_raise_softirq(cpumask_t callmap, unsigned int irq) -{ - int cpu; - - for_each_cpu(cpu, &callmap) { - unsigned int thread; - - thread = cpu_2_hwthread_id[cpu]; - - BUG_ON(thread == BAD_HWTHREAD_ID); - - metag_out32(1, T0KICKI + (thread * TnXKICK_STRIDE)); - } -} - -static TBIRES ipi_handler(TBIRES State, int SigNum, int Triggers, - int Inst, PTBI pTBI, int *handled) -{ - *handled = do_IPI(); - - return State; -} - -static struct kick_irq_handler ipi_irq = { - .func = ipi_handler, -}; - -static void smp_cross_call(cpumask_t callmap, enum ipi_msg_type msg) -{ - kick_raise_softirq(callmap, 1); -} - -static inline unsigned int get_core_count(void) -{ - int i; - unsigned int ret = 0; - - for (i = 0; i < CONFIG_NR_CPUS; i++) { - if (core_reg_read(TXUCT_ID, TXENABLE_REGNUM, i)) - ret++; - } - - return ret; -} - -/* - * Initialise the CPU possible map early - this describes the CPUs - * which may be present or become present in the system. - */ -void __init smp_init_cpus(void) -{ - unsigned int i, ncores = get_core_count(); - - /* If no hwthread_map early param was set use default mapping */ - for (i = 0; i < NR_CPUS; i++) - if (cpu_2_hwthread_id[i] == BAD_HWTHREAD_ID) { - cpu_2_hwthread_id[i] = i; - hwthread_id_2_cpu[i] = i; - } - - for (i = 0; i < ncores; i++) - set_cpu_possible(i, true); - - kick_register_func(&ipi_irq); -} diff --git a/arch/metag/kernel/stacktrace.c b/arch/metag/kernel/stacktrace.c deleted file mode 100644 index 09d67b7f51ca..000000000000 --- a/arch/metag/kernel/stacktrace.c +++ /dev/null @@ -1,187 +0,0 @@ -#include <linux/export.h> -#include <linux/sched.h> -#include <linux/sched/debug.h> -#include <linux/sched/task_stack.h> -#include <linux/stacktrace.h> - -#include <asm/stacktrace.h> - -#if defined(CONFIG_FRAME_POINTER) - -#ifdef CONFIG_KALLSYMS -#include <linux/kallsyms.h> -#include <linux/module.h> - -static unsigned long tbi_boing_addr; -static unsigned long tbi_boing_size; - -static void tbi_boing_init(void) -{ - /* We need to know where TBIBoingVec is and it's size */ - unsigned long size; - unsigned long offset; - char modname[MODULE_NAME_LEN]; - char name[KSYM_NAME_LEN]; - tbi_boing_addr = kallsyms_lookup_name("___TBIBoingVec"); - if (!tbi_boing_addr) - tbi_boing_addr = 1; - else if (!lookup_symbol_attrs(tbi_boing_addr, &size, - &offset, modname, name)) - tbi_boing_size = size; -} -#endif - -/* - * Unwind the current stack frame and store the new register values in the - * structure passed as argument. Unwinding is equivalent to a function return, - * hence the new PC value rather than LR should be used for backtrace. - */ -int notrace unwind_frame(struct stackframe *frame) -{ - struct metag_frame *fp = (struct metag_frame *)frame->fp; - unsigned long lr; - unsigned long fpnew; - - if (frame->fp & 0x7) - return -EINVAL; - - fpnew = fp->fp; - lr = fp->lr - 4; - -#ifdef CONFIG_KALLSYMS - /* If we've reached TBIBoingVec then we're at an interrupt - * entry point or a syscall entry point. The frame pointer - * points to a pt_regs which can be used to continue tracing on - * the other side of the boing. - */ - if (!tbi_boing_addr) - tbi_boing_init(); - if (tbi_boing_size && lr >= tbi_boing_addr && - lr < tbi_boing_addr + tbi_boing_size) { - struct pt_regs *regs = (struct pt_regs *)fpnew; - if (user_mode(regs)) - return -EINVAL; - fpnew = regs->ctx.AX[1].U0; - lr = regs->ctx.DX[4].U1; - } -#endif - - /* stack grows up, so frame pointers must decrease */ - if (fpnew < (ALIGN_DOWN((unsigned long)fp, THREAD_SIZE) + - sizeof(struct thread_info)) || fpnew >= (unsigned long)fp) - return -EINVAL; - - /* restore the registers from the stack frame */ - frame->fp = fpnew; - frame->pc = lr; - - return 0; -} -#else -int notrace unwind_frame(struct stackframe *frame) -{ - struct metag_frame *sp = (struct metag_frame *)frame->sp; - - if (frame->sp & 0x7) - return -EINVAL; - - while (!kstack_end(sp)) { - unsigned long addr = sp->lr - 4; - sp--; - - if (__kernel_text_address(addr)) { - frame->sp = (unsigned long)sp; - frame->pc = addr; - return 0; - } - } - return -EINVAL; -} -#endif - -void notrace walk_stackframe(struct stackframe *frame, - int (*fn)(struct stackframe *, void *), void *data) -{ - while (1) { - int ret; - - if (fn(frame, data)) - break; - ret = unwind_frame(frame); - if (ret < 0) - break; - } -} -EXPORT_SYMBOL(walk_stackframe); - -#ifdef CONFIG_STACKTRACE -struct stack_trace_data { - struct stack_trace *trace; - unsigned int no_sched_functions; - unsigned int skip; -}; - -static int save_trace(struct stackframe *frame, void *d) -{ - struct stack_trace_data *data = d; - struct stack_trace *trace = data->trace; - unsigned long addr = frame->pc; - - if (data->no_sched_functions && in_sched_functions(addr)) - return 0; - if (data->skip) { - data->skip--; - return 0; - } - - trace->entries[trace->nr_entries++] = addr; - - return trace->nr_entries >= trace->max_entries; -} - -void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) -{ - struct stack_trace_data data; - struct stackframe frame; - - data.trace = trace; - data.skip = trace->skip; - - if (tsk != current) { -#ifdef CONFIG_SMP - /* - * What guarantees do we have here that 'tsk' is not - * running on another CPU? For now, ignore it as we - * can't guarantee we won't explode. - */ - if (trace->nr_entries < trace->max_entries) - trace->entries[trace->nr_entries++] = ULONG_MAX; - return; -#else - data.no_sched_functions = 1; - frame.fp = thread_saved_fp(tsk); - frame.sp = thread_saved_sp(tsk); - frame.lr = 0; /* recovered from the stack */ - frame.pc = thread_saved_pc(tsk); -#endif - } else { - register unsigned long current_sp asm ("A0StP"); - - data.no_sched_functions = 0; - frame.fp = (unsigned long)__builtin_frame_address(0); - frame.sp = current_sp; - frame.lr = (unsigned long)__builtin_return_address(0); - frame.pc = (unsigned long)save_stack_trace_tsk; - } - - walk_stackframe(&frame, save_trace, &data); - if (trace->nr_entries < trace->max_entries) - trace->entries[trace->nr_entries++] = ULONG_MAX; -} - -void save_stack_trace(struct stack_trace *trace) -{ - save_stack_trace_tsk(current, trace); -} -EXPORT_SYMBOL_GPL(save_stack_trace); -#endif diff --git a/arch/metag/kernel/sys_metag.c b/arch/metag/kernel/sys_metag.c deleted file mode 100644 index 27d96499dd38..000000000000 --- a/arch/metag/kernel/sys_metag.c +++ /dev/null @@ -1,181 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * This file contains various random system calls that - * have a non-standard calling sequence on the Linux/Meta - * platform. - */ - -#include <linux/errno.h> -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/syscalls.h> -#include <linux/mman.h> -#include <linux/file.h> -#include <linux/fs.h> -#include <linux/uaccess.h> -#include <linux/unistd.h> -#include <asm/cacheflush.h> -#include <asm/core_reg.h> -#include <asm/global_lock.h> -#include <asm/switch.h> -#include <asm/syscall.h> -#include <asm/syscalls.h> -#include <asm/user_gateway.h> - -#define merge_64(hi, lo) ((((unsigned long long)(hi)) << 32) + \ - ((lo) & 0xffffffffUL)) - -int metag_mmap_check(unsigned long addr, unsigned long len, - unsigned long flags) -{ - /* We can't have people trying to write to the bottom of the - * memory map, there are mysterious unspecified things there that - * we don't want people trampling on. - */ - if ((flags & MAP_FIXED) && (addr < TASK_UNMAPPED_BASE)) - return -EINVAL; - - return 0; -} - -asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, - unsigned long prot, unsigned long flags, - unsigned long fd, unsigned long pgoff) -{ - /* The shift for mmap2 is constant, regardless of PAGE_SIZE setting. */ - if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1)) - return -EINVAL; - - pgoff >>= PAGE_SHIFT - 12; - - return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff); -} - -asmlinkage int sys_metag_setglobalbit(char __user *addr, int mask) -{ - char tmp; - int ret = 0; - unsigned int flags; - - if (!((__force unsigned int)addr >= LINCORE_BASE)) - return -EFAULT; - - __global_lock2(flags); - - metag_data_cache_flush((__force void *)addr, sizeof(mask)); - - ret = __get_user(tmp, addr); - if (ret) - goto out; - tmp |= mask; - ret = __put_user(tmp, addr); - - metag_data_cache_flush((__force void *)addr, sizeof(mask)); - -out: - __global_unlock2(flags); - - return ret; -} - -#define TXDEFR_FPU_MASK ((0x1f << 16) | 0x1f) - -asmlinkage void sys_metag_set_fpu_flags(unsigned int flags) -{ - unsigned int temp; - - flags &= TXDEFR_FPU_MASK; - - temp = __core_reg_get(TXDEFR); - temp &= ~TXDEFR_FPU_MASK; - temp |= flags; - __core_reg_set(TXDEFR, temp); -} - -asmlinkage int sys_metag_set_tls(void __user *ptr) -{ - current->thread.tls_ptr = ptr; - set_gateway_tls(ptr); - - return 0; -} - -asmlinkage void *sys_metag_get_tls(void) -{ - return (__force void *)current->thread.tls_ptr; -} - -asmlinkage long sys_truncate64_metag(const char __user *path, unsigned long lo, - unsigned long hi) -{ - return sys_truncate64(path, merge_64(hi, lo)); -} - -asmlinkage long sys_ftruncate64_metag(unsigned int fd, unsigned long lo, - unsigned long hi) -{ - return sys_ftruncate64(fd, merge_64(hi, lo)); -} - -asmlinkage long sys_fadvise64_64_metag(int fd, unsigned long offs_lo, - unsigned long offs_hi, - unsigned long len_lo, - unsigned long len_hi, int advice) -{ - return sys_fadvise64_64(fd, merge_64(offs_hi, offs_lo), - merge_64(len_hi, len_lo), advice); -} - -asmlinkage long sys_readahead_metag(int fd, unsigned long lo, unsigned long hi, - size_t count) -{ - return sys_readahead(fd, merge_64(hi, lo), count); -} - -asmlinkage ssize_t sys_pread64_metag(unsigned long fd, char __user *buf, - size_t count, unsigned long lo, - unsigned long hi) -{ - return sys_pread64(fd, buf, count, merge_64(hi, lo)); -} - -asmlinkage ssize_t sys_pwrite64_metag(unsigned long fd, char __user *buf, - size_t count, unsigned long lo, - unsigned long hi) -{ - return sys_pwrite64(fd, buf, count, merge_64(hi, lo)); -} - -asmlinkage long sys_sync_file_range_metag(int fd, unsigned long offs_lo, - unsigned long offs_hi, - unsigned long len_lo, - unsigned long len_hi, - unsigned int flags) -{ - return sys_sync_file_range(fd, merge_64(offs_hi, offs_lo), - merge_64(len_hi, len_lo), flags); -} - -/* Provide the actual syscall number to call mapping. */ -#undef __SYSCALL -#define __SYSCALL(nr, call) [nr] = (call), - -/* - * We need wrappers for anything with unaligned 64bit arguments - */ -#define sys_truncate64 sys_truncate64_metag -#define sys_ftruncate64 sys_ftruncate64_metag -#define sys_fadvise64_64 sys_fadvise64_64_metag -#define sys_readahead sys_readahead_metag -#define sys_pread64 sys_pread64_metag -#define sys_pwrite64 sys_pwrite64_metag -#define sys_sync_file_range sys_sync_file_range_metag - -/* - * Note that we can't include <linux/unistd.h> here since the header - * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well. - */ -const void *sys_call_table[__NR_syscalls] = { - [0 ... __NR_syscalls-1] = sys_ni_syscall, -#include <asm/unistd.h> -}; diff --git a/arch/metag/kernel/tbiunexp.S b/arch/metag/kernel/tbiunexp.S deleted file mode 100644 index 2664808086c7..000000000000 --- a/arch/metag/kernel/tbiunexp.S +++ /dev/null @@ -1,23 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* Pass a breakpoint through to Codescape */ - -#include <asm/tbx.h> - - .text - .global ___TBIUnExpXXX - .type ___TBIUnExpXXX,function -___TBIUnExpXXX: - TSTT D0Ar2,#TBICTX_CRIT_BIT ! Result of nestable int call? - BZ $LTBINormCase ! UnExpXXX at background level - MOV D0Re0,TXMASKI ! Read TXMASKI - XOR TXMASKI,D1Re0,D1Re0 ! Turn off BGNDHALT handling! - OR D0Ar2,D0Ar2,D0Re0 ! Preserve bits cleared -$LTBINormCase: - MSETL [A0StP],D0Ar6,D0Ar4,D0Ar2 ! Save args on stack - SETL [A0StP++],D0Ar2,D1Ar1 ! Init area for returned values - SWITCH #0xC20208 ! Total stack frame size 8 Dwords - ! write back size 2 Dwords - GETL D0Re0,D1Re0,[--A0StP] ! Get result - SUB A0StP,A0StP,#(8*3) ! Recover stack frame - MOV PC,D1RtP - .size ___TBIUnExpXXX,.-___TBIUnExpXXX diff --git a/arch/metag/kernel/tcm.c b/arch/metag/kernel/tcm.c deleted file mode 100644 index 1d7b4e33b114..000000000000 --- a/arch/metag/kernel/tcm.c +++ /dev/null @@ -1,152 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2010 Imagination Technologies Ltd. - */ - -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/spinlock.h> -#include <linux/stddef.h> -#include <linux/genalloc.h> -#include <linux/string.h> -#include <linux/list.h> -#include <linux/slab.h> -#include <asm/page.h> -#include <asm/tcm.h> - -struct tcm_pool { - struct list_head list; - unsigned int tag; - unsigned long start; - unsigned long end; - struct gen_pool *pool; -}; - -static LIST_HEAD(pool_list); - -static struct tcm_pool *find_pool(unsigned int tag) -{ - struct list_head *lh; - struct tcm_pool *pool; - - list_for_each(lh, &pool_list) { - pool = list_entry(lh, struct tcm_pool, list); - if (pool->tag == tag) - return pool; - } - - return NULL; -} - -/** - * tcm_alloc - allocate memory from a TCM pool - * @tag: tag of the pool to allocate memory from - * @len: number of bytes to be allocated - * - * Allocate the requested number of bytes from the pool matching - * the specified tag. Returns the address of the allocated memory - * or zero on failure. - */ -unsigned long tcm_alloc(unsigned int tag, size_t len) -{ - unsigned long vaddr; - struct tcm_pool *pool; - - pool = find_pool(tag); - if (!pool) - return 0; - - vaddr = gen_pool_alloc(pool->pool, len); - if (!vaddr) - return 0; - - return vaddr; -} - -/** - * tcm_free - free a block of memory to a TCM pool - * @tag: tag of the pool to free memory to - * @addr: address of the memory to be freed - * @len: number of bytes to be freed - * - * Free the requested number of bytes at a specific address to the - * pool matching the specified tag. - */ -void tcm_free(unsigned int tag, unsigned long addr, size_t len) -{ - struct tcm_pool *pool; - - pool = find_pool(tag); - if (!pool) - return; - gen_pool_free(pool->pool, addr, len); -} - -/** - * tcm_lookup_tag - find the tag matching an address - * @p: memory address to lookup the tag for - * - * Find the tag of the tcm memory region that contains the - * specified address. Returns %TCM_INVALID_TAG if no such - * memory region could be found. - */ -unsigned int tcm_lookup_tag(unsigned long p) -{ - struct list_head *lh; - struct tcm_pool *pool; - unsigned long addr = (unsigned long) p; - - list_for_each(lh, &pool_list) { - pool = list_entry(lh, struct tcm_pool, list); - if (addr >= pool->start && addr < pool->end) - return pool->tag; - } - - return TCM_INVALID_TAG; -} - -/** - * tcm_add_region - add a memory region to TCM pool list - * @reg: descriptor of region to be added - * - * Add a region of memory to the TCM pool list. Returns 0 on success. - */ -int __init tcm_add_region(struct tcm_region *reg) -{ - struct tcm_pool *pool; - - pool = kmalloc(sizeof(*pool), GFP_KERNEL); - if (!pool) { - pr_err("Failed to alloc memory for TCM pool!\n"); - return -ENOMEM; - } - - pool->tag = reg->tag; - pool->start = reg->res.start; - pool->end = reg->res.end; - - /* - * 2^3 = 8 bytes granularity to allow for 64bit access alignment. - * -1 = NUMA node specifier. - */ - pool->pool = gen_pool_create(3, -1); - - if (!pool->pool) { - pr_err("Failed to create TCM pool!\n"); - kfree(pool); - return -ENOMEM; - } - - if (gen_pool_add(pool->pool, reg->res.start, - reg->res.end - reg->res.start + 1, -1)) { - pr_err("Failed to add memory to TCM pool!\n"); - return -ENOMEM; - } - pr_info("Added %s TCM pool (%08x bytes @ %08x)\n", - reg->res.name, reg->res.end - reg->res.start + 1, - reg->res.start); - - list_add_tail(&pool->list, &pool_list); - - return 0; -} diff --git a/arch/metag/kernel/time.c b/arch/metag/kernel/time.c deleted file mode 100644 index 1e809e3b43d1..000000000000 --- a/arch/metag/kernel/time.c +++ /dev/null @@ -1,26 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2005-2013 Imagination Technologies Ltd. - * - * This file contains the Meta-specific time handling details. - * - */ - -#include <clocksource/metag_generic.h> -#include <linux/clk-provider.h> -#include <linux/init.h> -#include <asm/clock.h> - -void __init time_init(void) -{ -#ifdef CONFIG_COMMON_CLK - /* Init clocks from device tree */ - of_clk_init(NULL); -#endif - - /* Init meta clocks, particularly the core clock */ - init_metag_clocks(); - - /* Set up the timer clock sources */ - metag_generic_timer_init(); -} diff --git a/arch/metag/kernel/topology.c b/arch/metag/kernel/topology.c deleted file mode 100644 index 4ba595701f7d..000000000000 --- a/arch/metag/kernel/topology.c +++ /dev/null @@ -1,78 +0,0 @@ -/* - * Copyright (C) 2007 Paul Mundt - * Copyright (C) 2010 Imagination Technolohies Ltd. - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - */ -#include <linux/cpu.h> -#include <linux/cpumask.h> -#include <linux/init.h> -#include <linux/percpu.h> -#include <linux/node.h> -#include <linux/nodemask.h> -#include <linux/topology.h> - -#include <asm/cpu.h> - -DEFINE_PER_CPU(struct cpuinfo_metag, cpu_data); - -cpumask_t cpu_core_map[NR_CPUS]; -EXPORT_SYMBOL(cpu_core_map); - -static cpumask_t cpu_coregroup_map(unsigned int cpu) -{ - return *cpu_possible_mask; -} - -const struct cpumask *cpu_coregroup_mask(unsigned int cpu) -{ - return &cpu_core_map[cpu]; -} - -int arch_update_cpu_topology(void) -{ - unsigned int cpu; - - for_each_possible_cpu(cpu) - cpu_core_map[cpu] = cpu_coregroup_map(cpu); - - return 0; -} - -static int __init topology_init(void) -{ - int i, ret; - -#ifdef CONFIG_NEED_MULTIPLE_NODES - for_each_online_node(i) - register_one_node(i); -#endif - - for_each_present_cpu(i) { - struct cpuinfo_metag *cpuinfo = &per_cpu(cpu_data, i); -#ifdef CONFIG_HOTPLUG_CPU - cpuinfo->cpu.hotpluggable = 1; -#endif - ret = register_cpu(&cpuinfo->cpu, i); - if (unlikely(ret)) - pr_warn("%s: register_cpu %d failed (%d)\n", - __func__, i, ret); - } - -#if defined(CONFIG_NUMA) && !defined(CONFIG_SMP) - /* - * In the UP case, make sure the CPU association is still - * registered under each node. Without this, sysfs fails - * to make the connection between nodes other than node0 - * and cpu0. - */ - for_each_online_node(i) - if (i != numa_node_id()) - register_cpu_under_node(raw_smp_processor_id(), i); -#endif - - return 0; -} -subsys_initcall(topology_init); diff --git a/arch/metag/kernel/traps.c b/arch/metag/kernel/traps.c deleted file mode 100644 index 3b62b1b0c0b5..000000000000 --- a/arch/metag/kernel/traps.c +++ /dev/null @@ -1,992 +0,0 @@ -/* - * Meta exception handling. - * - * Copyright (C) 2005,2006,2007,2008,2009,2012 Imagination Technologies Ltd. - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file COPYING in the main directory of this archive - * for more details. - */ - -#include <linux/export.h> -#include <linux/sched.h> -#include <linux/sched/debug.h> -#include <linux/sched/task.h> -#include <linux/sched/task_stack.h> -#include <linux/signal.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/types.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/preempt.h> -#include <linux/ptrace.h> -#include <linux/module.h> -#include <linux/kallsyms.h> -#include <linux/kdebug.h> -#include <linux/kexec.h> -#include <linux/unistd.h> -#include <linux/smp.h> -#include <linux/slab.h> -#include <linux/syscalls.h> - -#include <asm/bug.h> -#include <asm/core_reg.h> -#include <asm/irqflags.h> -#include <asm/siginfo.h> -#include <asm/traps.h> -#include <asm/hwthread.h> -#include <asm/setup.h> -#include <asm/switch.h> -#include <asm/user_gateway.h> -#include <asm/syscall.h> -#include <asm/syscalls.h> - -/* Passing syscall arguments as long long is quicker. */ -typedef unsigned int (*LPSYSCALL) (unsigned long long, - unsigned long long, - unsigned long long); - -/* - * Users of LNKSET should compare the bus error bits obtained from DEFR - * against TXDEFR_LNKSET_SUCCESS only as the failure code will vary between - * different cores revisions. - */ -#define TXDEFR_LNKSET_SUCCESS 0x02000000 -#define TXDEFR_LNKSET_FAILURE 0x04000000 - -/* - * Our global TBI handle. Initialised from setup.c/setup_arch. - */ -DECLARE_PER_CPU(PTBI, pTBI); - -#ifdef CONFIG_SMP -static DEFINE_PER_CPU(unsigned int, trigger_mask); -#else -unsigned int global_trigger_mask; -EXPORT_SYMBOL(global_trigger_mask); -#endif - -unsigned long per_cpu__stack_save[NR_CPUS]; - -static const char * const trap_names[] = { - [TBIXXF_SIGNUM_IIF] = "Illegal instruction fault", - [TBIXXF_SIGNUM_PGF] = "Privilege violation", - [TBIXXF_SIGNUM_DHF] = "Unaligned data access fault", - [TBIXXF_SIGNUM_IGF] = "Code fetch general read failure", - [TBIXXF_SIGNUM_DGF] = "Data access general read/write fault", - [TBIXXF_SIGNUM_IPF] = "Code fetch page fault", - [TBIXXF_SIGNUM_DPF] = "Data access page fault", - [TBIXXF_SIGNUM_IHF] = "Instruction breakpoint", - [TBIXXF_SIGNUM_DWF] = "Read-only data access fault", -}; - -const char *trap_name(int trapno) -{ - if (trapno >= 0 && trapno < ARRAY_SIZE(trap_names) - && trap_names[trapno]) - return trap_names[trapno]; - return "Unknown fault"; -} - -static DEFINE_SPINLOCK(die_lock); - -void __noreturn die(const char *str, struct pt_regs *regs, - long err, unsigned long addr) -{ - static int die_counter; - - oops_enter(); - - spin_lock_irq(&die_lock); - console_verbose(); - bust_spinlocks(1); - pr_err("%s: err %04lx (%s) addr %08lx [#%d]\n", str, err & 0xffff, - trap_name(err & 0xffff), addr, ++die_counter); - - print_modules(); - show_regs(regs); - - pr_err("Process: %s (pid: %d, stack limit = %p)\n", current->comm, - task_pid_nr(current), task_stack_page(current) + THREAD_SIZE); - - bust_spinlocks(0); - add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); - if (kexec_should_crash(current)) - crash_kexec(regs); - - if (in_interrupt()) - panic("Fatal exception in interrupt"); - - if (panic_on_oops) - panic("Fatal exception"); - - spin_unlock_irq(&die_lock); - oops_exit(); - do_exit(SIGSEGV); -} - -#ifdef CONFIG_METAG_DSP -/* - * The ECH encoding specifies the size of a DSPRAM as, - * - * "slots" / 4 - * - * A "slot" is the size of two DSPRAM bank entries; an entry from - * DSPRAM bank A and an entry from DSPRAM bank B. One DSPRAM bank - * entry is 4 bytes. - */ -#define SLOT_SZ 8 -static inline unsigned int decode_dspram_size(unsigned int size) -{ - unsigned int _sz = size & 0x7f; - - return _sz * SLOT_SZ * 4; -} - -static void dspram_save(struct meta_ext_context *dsp_ctx, - unsigned int ramA_sz, unsigned int ramB_sz) -{ - unsigned int ram_sz[2]; - int i; - - ram_sz[0] = ramA_sz; - ram_sz[1] = ramB_sz; - - for (i = 0; i < 2; i++) { - if (ram_sz[i] != 0) { - unsigned int sz; - - if (i == 0) - sz = decode_dspram_size(ram_sz[i] >> 8); - else - sz = decode_dspram_size(ram_sz[i]); - - if (dsp_ctx->ram[i] == NULL) { - dsp_ctx->ram[i] = kmalloc(sz, GFP_KERNEL); - - if (dsp_ctx->ram[i] == NULL) - panic("couldn't save DSP context"); - } else { - if (ram_sz[i] > dsp_ctx->ram_sz[i]) { - kfree(dsp_ctx->ram[i]); - - dsp_ctx->ram[i] = kmalloc(sz, - GFP_KERNEL); - - if (dsp_ctx->ram[i] == NULL) - panic("couldn't save DSP context"); - } - } - - if (i == 0) - __TBIDspramSaveA(ram_sz[i], dsp_ctx->ram[i]); - else - __TBIDspramSaveB(ram_sz[i], dsp_ctx->ram[i]); - - dsp_ctx->ram_sz[i] = ram_sz[i]; - } - } -} -#endif /* CONFIG_METAG_DSP */ - -/* - * Allow interrupts to be nested and save any "extended" register - * context state, e.g. DSP regs and RAMs. - */ -static void nest_interrupts(TBIRES State, unsigned long mask) -{ -#ifdef CONFIG_METAG_DSP - struct meta_ext_context *dsp_ctx; - unsigned int D0_8; - - /* - * D0.8 may contain an ECH encoding. The upper 16 bits - * tell us what DSP resources the current process is - * using. OR the bits into the SaveMask so that - * __TBINestInts() knows what resources to save as - * part of this context. - * - * Don't save the context if we're nesting interrupts in the - * kernel because the kernel doesn't use DSP hardware. - */ - D0_8 = __core_reg_get(D0.8); - - if (D0_8 && (State.Sig.SaveMask & TBICTX_PRIV_BIT)) { - State.Sig.SaveMask |= (D0_8 >> 16); - - dsp_ctx = current->thread.dsp_context; - if (dsp_ctx == NULL) { - dsp_ctx = kzalloc(sizeof(*dsp_ctx), GFP_KERNEL); - if (dsp_ctx == NULL) - panic("couldn't save DSP context: ENOMEM"); - - current->thread.dsp_context = dsp_ctx; - } - - current->thread.user_flags |= (D0_8 & 0xffff0000); - __TBINestInts(State, &dsp_ctx->regs, mask); - dspram_save(dsp_ctx, D0_8 & 0x7f00, D0_8 & 0x007f); - } else - __TBINestInts(State, NULL, mask); -#else - __TBINestInts(State, NULL, mask); -#endif -} - -void head_end(TBIRES State, unsigned long mask) -{ - unsigned int savemask = (unsigned short)State.Sig.SaveMask; - unsigned int ctx_savemask = (unsigned short)State.Sig.pCtx->SaveMask; - - if (savemask & TBICTX_PRIV_BIT) { - ctx_savemask |= TBICTX_PRIV_BIT; - current->thread.user_flags = savemask; - } - - /* Always undo the sleep bit */ - ctx_savemask &= ~TBICTX_WAIT_BIT; - - /* Always save the catch buffer and RD pipe if they are dirty */ - savemask |= TBICTX_XCBF_BIT; - - /* Only save the catch and RD if we have not already done so. - * Note - the RD bits are in the pCtx only, and not in the - * State.SaveMask. - */ - if ((savemask & TBICTX_CBUF_BIT) || - (ctx_savemask & TBICTX_CBRP_BIT)) { - /* Have we already saved the buffers though? - * - See TestTrack 5071 */ - if (ctx_savemask & TBICTX_XCBF_BIT) { - /* Strip off the bits so the call to __TBINestInts - * won't save the buffers again. */ - savemask &= ~TBICTX_CBUF_BIT; - ctx_savemask &= ~TBICTX_CBRP_BIT; - } - } - -#ifdef CONFIG_METAG_META21 - { - unsigned int depth, txdefr; - - /* - * Save TXDEFR state. - * - * The process may have been interrupted after a LNKSET, but - * before it could read the DEFR state, so we mustn't lose that - * state or it could end up retrying an atomic operation that - * succeeded. - * - * All interrupts are disabled at this point so we - * don't need to perform any locking. We must do this - * dance before we use LNKGET or LNKSET. - */ - BUG_ON(current->thread.int_depth > HARDIRQ_BITS); - - depth = current->thread.int_depth++; - - txdefr = __core_reg_get(TXDEFR); - - txdefr &= TXDEFR_BUS_STATE_BITS; - if (txdefr & TXDEFR_LNKSET_SUCCESS) - current->thread.txdefr_failure &= ~(1 << depth); - else - current->thread.txdefr_failure |= (1 << depth); - } -#endif - - State.Sig.SaveMask = savemask; - State.Sig.pCtx->SaveMask = ctx_savemask; - - nest_interrupts(State, mask); - -#ifdef CONFIG_METAG_POISON_CATCH_BUFFERS - /* Poison the catch registers. This shows up any mistakes we have - * made in their handling MUCH quicker. - */ - __core_reg_set(TXCATCH0, 0x87650021); - __core_reg_set(TXCATCH1, 0x87654322); - __core_reg_set(TXCATCH2, 0x87654323); - __core_reg_set(TXCATCH3, 0x87654324); -#endif /* CONFIG_METAG_POISON_CATCH_BUFFERS */ -} - -TBIRES tail_end_sys(TBIRES State, int syscall, int *restart) -{ - struct pt_regs *regs = (struct pt_regs *)State.Sig.pCtx; - unsigned long flags; - - local_irq_disable(); - - if (user_mode(regs)) { - flags = current_thread_info()->flags; - if (flags & _TIF_WORK_MASK && - do_work_pending(regs, flags, syscall)) { - *restart = 1; - return State; - } - -#ifdef CONFIG_METAG_FPU - if (current->thread.fpu_context && - current->thread.fpu_context->needs_restore) { - __TBICtxFPURestore(State, current->thread.fpu_context); - /* - * Clearing this bit ensures the FP unit is not made - * active again unless it is used. - */ - State.Sig.SaveMask &= ~TBICTX_FPAC_BIT; - current->thread.fpu_context->needs_restore = false; - } - State.Sig.TrigMask |= TBI_TRIG_BIT(TBID_SIGNUM_DFR); -#endif - } - - /* TBI will turn interrupts back on at some point. */ - if (!irqs_disabled_flags((unsigned long)State.Sig.TrigMask)) - trace_hardirqs_on(); - -#ifdef CONFIG_METAG_DSP - /* - * If we previously saved an extended context then restore it - * now. Otherwise, clear D0.8 because this process is not - * using DSP hardware. - */ - if (State.Sig.pCtx->SaveMask & TBICTX_XEXT_BIT) { - unsigned int D0_8; - struct meta_ext_context *dsp_ctx = current->thread.dsp_context; - - /* Make sure we're going to return to userland. */ - BUG_ON(current->thread.int_depth != 1); - - if (dsp_ctx->ram_sz[0] > 0) - __TBIDspramRestoreA(dsp_ctx->ram_sz[0], - dsp_ctx->ram[0]); - if (dsp_ctx->ram_sz[1] > 0) - __TBIDspramRestoreB(dsp_ctx->ram_sz[1], - dsp_ctx->ram[1]); - - State.Sig.SaveMask |= State.Sig.pCtx->SaveMask; - __TBICtxRestore(State, current->thread.dsp_context); - D0_8 = __core_reg_get(D0.8); - D0_8 |= current->thread.user_flags & 0xffff0000; - D0_8 |= (dsp_ctx->ram_sz[1] | dsp_ctx->ram_sz[0]) & 0xffff; - __core_reg_set(D0.8, D0_8); - } else - __core_reg_set(D0.8, 0); -#endif /* CONFIG_METAG_DSP */ - -#ifdef CONFIG_METAG_META21 - { - unsigned int depth, txdefr; - - /* - * If there hasn't been a LNKSET since the last LNKGET then the - * link flag will be set, causing the next LNKSET to succeed if - * the addresses match. The two LNK operations may not be a pair - * (e.g. see atomic_read()), so the LNKSET should fail. - * We use a conditional-never LNKSET to clear the link flag - * without side effects. - */ - asm volatile("LNKSETDNV [D0Re0],D0Re0"); - - depth = --current->thread.int_depth; - - BUG_ON(user_mode(regs) && depth); - - txdefr = __core_reg_get(TXDEFR); - - txdefr &= ~TXDEFR_BUS_STATE_BITS; - - /* Do we need to restore a failure code into TXDEFR? */ - if (current->thread.txdefr_failure & (1 << depth)) - txdefr |= (TXDEFR_LNKSET_FAILURE | TXDEFR_BUS_TRIG_BIT); - else - txdefr |= (TXDEFR_LNKSET_SUCCESS | TXDEFR_BUS_TRIG_BIT); - - __core_reg_set(TXDEFR, txdefr); - } -#endif - return State; -} - -#ifdef CONFIG_SMP -/* - * If we took an interrupt in the middle of __kuser_get_tls then we need - * to rewind the PC to the start of the function in case the process - * gets migrated to another thread (SMP only) and it reads the wrong tls - * data. - */ -static inline void _restart_critical_section(TBIRES State) -{ - unsigned long get_tls_start; - unsigned long get_tls_end; - - get_tls_start = (unsigned long)__kuser_get_tls - - (unsigned long)&__user_gateway_start; - - get_tls_start += USER_GATEWAY_PAGE; - - get_tls_end = (unsigned long)__kuser_get_tls_end - - (unsigned long)&__user_gateway_start; - - get_tls_end += USER_GATEWAY_PAGE; - - if ((State.Sig.pCtx->CurrPC >= get_tls_start) && - (State.Sig.pCtx->CurrPC < get_tls_end)) - State.Sig.pCtx->CurrPC = get_tls_start; -} -#else -/* - * If we took an interrupt in the middle of - * __kuser_cmpxchg then we need to rewind the PC to the - * start of the function. - */ -static inline void _restart_critical_section(TBIRES State) -{ - unsigned long cmpxchg_start; - unsigned long cmpxchg_end; - - cmpxchg_start = (unsigned long)__kuser_cmpxchg - - (unsigned long)&__user_gateway_start; - - cmpxchg_start += USER_GATEWAY_PAGE; - - cmpxchg_end = (unsigned long)__kuser_cmpxchg_end - - (unsigned long)&__user_gateway_start; - - cmpxchg_end += USER_GATEWAY_PAGE; - - if ((State.Sig.pCtx->CurrPC >= cmpxchg_start) && - (State.Sig.pCtx->CurrPC < cmpxchg_end)) - State.Sig.pCtx->CurrPC = cmpxchg_start; -} -#endif - -/* Used by kick_handler() */ -void restart_critical_section(TBIRES State) -{ - _restart_critical_section(State); -} - -TBIRES trigger_handler(TBIRES State, int SigNum, int Triggers, int Inst, - PTBI pTBI) -{ - head_end(State, ~INTS_OFF_MASK); - - /* If we interrupted user code handle any critical sections. */ - if (State.Sig.SaveMask & TBICTX_PRIV_BIT) - _restart_critical_section(State); - - trace_hardirqs_off(); - - do_IRQ(SigNum, (struct pt_regs *)State.Sig.pCtx); - - return tail_end(State); -} - -static unsigned int load_fault(PTBICTXEXTCB0 pbuf) -{ - return pbuf->CBFlags & TXCATCH0_READ_BIT; -} - -static unsigned long fault_address(PTBICTXEXTCB0 pbuf) -{ - return pbuf->CBAddr; -} - -static void unhandled_fault(struct pt_regs *regs, unsigned long addr, - int signo, int code, int trapno) -{ - if (user_mode(regs)) { - siginfo_t info; - - if (show_unhandled_signals && unhandled_signal(current, signo) - && printk_ratelimit()) { - - pr_info("pid %d unhandled fault: pc 0x%08x, addr 0x%08lx, trap %d (%s)\n", - current->pid, regs->ctx.CurrPC, addr, - trapno, trap_name(trapno)); - print_vma_addr(" in ", regs->ctx.CurrPC); - print_vma_addr(" rtp in ", regs->ctx.DX[4].U1); - printk("\n"); - show_regs(regs); - } - - info.si_signo = signo; - info.si_errno = 0; - info.si_code = code; - info.si_addr = (__force void __user *)addr; - info.si_trapno = trapno; - force_sig_info(signo, &info, current); - } else { - die("Oops", regs, trapno, addr); - } -} - -static int handle_data_fault(PTBICTXEXTCB0 pcbuf, struct pt_regs *regs, - unsigned int data_address, int trapno) -{ - int ret; - - ret = do_page_fault(regs, data_address, !load_fault(pcbuf), trapno); - - return ret; -} - -static unsigned long get_inst_fault_address(struct pt_regs *regs) -{ - return regs->ctx.CurrPC; -} - -TBIRES fault_handler(TBIRES State, int SigNum, int Triggers, - int Inst, PTBI pTBI) -{ - struct pt_regs *regs = (struct pt_regs *)State.Sig.pCtx; - PTBICTXEXTCB0 pcbuf = (PTBICTXEXTCB0)®s->extcb0; - unsigned long data_address; - - head_end(State, ~INTS_OFF_MASK); - - /* Hardware breakpoint or data watch */ - if ((SigNum == TBIXXF_SIGNUM_IHF) || - ((SigNum == TBIXXF_SIGNUM_DHF) && - (pcbuf[0].CBFlags & (TXCATCH0_WATCH1_BIT | - TXCATCH0_WATCH0_BIT)))) { - State = __TBIUnExpXXX(State, SigNum, Triggers, Inst, - pTBI); - return tail_end(State); - } - - local_irq_enable(); - - data_address = fault_address(pcbuf); - - switch (SigNum) { - case TBIXXF_SIGNUM_IGF: - /* 1st-level entry invalid (instruction fetch) */ - case TBIXXF_SIGNUM_IPF: { - /* 2nd-level entry invalid (instruction fetch) */ - unsigned long addr = get_inst_fault_address(regs); - do_page_fault(regs, addr, 0, SigNum); - break; - } - - case TBIXXF_SIGNUM_DGF: - /* 1st-level entry invalid (data access) */ - case TBIXXF_SIGNUM_DPF: - /* 2nd-level entry invalid (data access) */ - case TBIXXF_SIGNUM_DWF: - /* Write to read only page */ - handle_data_fault(pcbuf, regs, data_address, SigNum); - break; - - case TBIXXF_SIGNUM_IIF: - /* Illegal instruction */ - unhandled_fault(regs, regs->ctx.CurrPC, SIGILL, ILL_ILLOPC, - SigNum); - break; - - case TBIXXF_SIGNUM_DHF: - /* Unaligned access */ - unhandled_fault(regs, data_address, SIGBUS, BUS_ADRALN, - SigNum); - break; - case TBIXXF_SIGNUM_PGF: - /* Privilege violation */ - unhandled_fault(regs, data_address, SIGSEGV, SEGV_ACCERR, - SigNum); - break; - default: - BUG(); - break; - } - - return tail_end(State); -} - -static bool switch_is_syscall(unsigned int inst) -{ - return inst == __METAG_SW_ENCODING(SYS); -} - -static bool switch_is_legacy_syscall(unsigned int inst) -{ - return inst == __METAG_SW_ENCODING(SYS_LEGACY); -} - -static inline void step_over_switch(struct pt_regs *regs, unsigned int inst) -{ - regs->ctx.CurrPC += 4; -} - -static inline int test_syscall_work(void) -{ - return current_thread_info()->flags & _TIF_WORK_SYSCALL_MASK; -} - -TBIRES switch1_handler(TBIRES State, int SigNum, int Triggers, - int Inst, PTBI pTBI) -{ - struct pt_regs *regs = (struct pt_regs *)State.Sig.pCtx; - unsigned int sysnumber; - unsigned long long a1_a2, a3_a4, a5_a6; - LPSYSCALL syscall_entry; - int restart; - - head_end(State, ~INTS_OFF_MASK); - - /* - * If this is not a syscall SWITCH it could be a breakpoint. - */ - if (!switch_is_syscall(Inst)) { - /* - * Alert the user if they're trying to use legacy system - * calls. This suggests they need to update their C - * library and build against up to date kernel headers. - */ - if (switch_is_legacy_syscall(Inst)) - pr_warn_once("WARNING: A legacy syscall was made. Your userland needs updating.\n"); - /* - * We don't know how to handle the SWITCH and cannot - * safely ignore it, so treat all unknown switches - * (including breakpoints) as traps. - */ - force_sig(SIGTRAP, current); - return tail_end(State); - } - - local_irq_enable(); - -restart_syscall: - restart = 0; - sysnumber = regs->ctx.DX[0].U1; - - if (test_syscall_work()) - sysnumber = syscall_trace_enter(regs); - - /* Skip over the SWITCH instruction - or you just get 'stuck' on it! */ - step_over_switch(regs, Inst); - - if (sysnumber >= __NR_syscalls) { - pr_debug("unknown syscall number: %d\n", sysnumber); - syscall_entry = (LPSYSCALL) sys_ni_syscall; - } else { - syscall_entry = (LPSYSCALL) sys_call_table[sysnumber]; - } - - /* Use 64bit loads for speed. */ - a5_a6 = *(unsigned long long *)®s->ctx.DX[1]; - a3_a4 = *(unsigned long long *)®s->ctx.DX[2]; - a1_a2 = *(unsigned long long *)®s->ctx.DX[3]; - - /* here is the actual call to the syscall handler functions */ - regs->ctx.DX[0].U0 = syscall_entry(a1_a2, a3_a4, a5_a6); - - if (test_syscall_work()) - syscall_trace_leave(regs); - - State = tail_end_sys(State, sysnumber, &restart); - /* Handlerless restarts shouldn't go via userland */ - if (restart) - goto restart_syscall; - return State; -} - -TBIRES switchx_handler(TBIRES State, int SigNum, int Triggers, - int Inst, PTBI pTBI) -{ - struct pt_regs *regs = (struct pt_regs *)State.Sig.pCtx; - - /* - * This can be caused by any user process simply executing an unusual - * SWITCH instruction. If there's no DA, __TBIUnExpXXX will cause the - * thread to stop, so signal a SIGTRAP instead. - */ - head_end(State, ~INTS_OFF_MASK); - if (user_mode(regs)) - force_sig(SIGTRAP, current); - else - State = __TBIUnExpXXX(State, SigNum, Triggers, Inst, pTBI); - return tail_end(State); -} - -#ifdef CONFIG_METAG_META21 -TBIRES fpe_handler(TBIRES State, int SigNum, int Triggers, int Inst, PTBI pTBI) -{ - struct pt_regs *regs = (struct pt_regs *)State.Sig.pCtx; - unsigned int error_state = Triggers; - siginfo_t info; - - head_end(State, ~INTS_OFF_MASK); - - local_irq_enable(); - - info.si_signo = SIGFPE; - - if (error_state & TXSTAT_FPE_INVALID_BIT) - info.si_code = FPE_FLTINV; - else if (error_state & TXSTAT_FPE_DIVBYZERO_BIT) - info.si_code = FPE_FLTDIV; - else if (error_state & TXSTAT_FPE_OVERFLOW_BIT) - info.si_code = FPE_FLTOVF; - else if (error_state & TXSTAT_FPE_UNDERFLOW_BIT) - info.si_code = FPE_FLTUND; - else if (error_state & TXSTAT_FPE_INEXACT_BIT) - info.si_code = FPE_FLTRES; - else - info.si_code = FPE_FIXME; - info.si_errno = 0; - info.si_addr = (__force void __user *)regs->ctx.CurrPC; - force_sig_info(SIGFPE, &info, current); - - return tail_end(State); -} -#endif - -#ifdef CONFIG_METAG_SUSPEND_MEM -struct traps_context { - PTBIAPIFN fnSigs[TBID_SIGNUM_MAX + 1]; -}; - -static struct traps_context *metag_traps_context; - -int traps_save_context(void) -{ - unsigned long cpu = smp_processor_id(); - PTBI _pTBI = per_cpu(pTBI, cpu); - struct traps_context *context; - - context = kzalloc(sizeof(*context), GFP_ATOMIC); - if (!context) - return -ENOMEM; - - memcpy(context->fnSigs, (void *)_pTBI->fnSigs, sizeof(context->fnSigs)); - - metag_traps_context = context; - return 0; -} - -int traps_restore_context(void) -{ - unsigned long cpu = smp_processor_id(); - PTBI _pTBI = per_cpu(pTBI, cpu); - struct traps_context *context = metag_traps_context; - - metag_traps_context = NULL; - - memcpy((void *)_pTBI->fnSigs, context->fnSigs, sizeof(context->fnSigs)); - - kfree(context); - return 0; -} -#endif - -#ifdef CONFIG_SMP -static inline unsigned int _get_trigger_mask(void) -{ - unsigned long cpu = smp_processor_id(); - return per_cpu(trigger_mask, cpu); -} - -unsigned int get_trigger_mask(void) -{ - return _get_trigger_mask(); -} -EXPORT_SYMBOL(get_trigger_mask); - -static void set_trigger_mask(unsigned int mask) -{ - unsigned long cpu = smp_processor_id(); - per_cpu(trigger_mask, cpu) = mask; -} - -void arch_local_irq_enable(void) -{ - preempt_disable(); - arch_local_irq_restore(_get_trigger_mask()); - preempt_enable_no_resched(); -} -EXPORT_SYMBOL(arch_local_irq_enable); -#else -static void set_trigger_mask(unsigned int mask) -{ - global_trigger_mask = mask; -} -#endif - -void per_cpu_trap_init(unsigned long cpu) -{ - TBIRES int_context; - unsigned int thread = cpu_2_hwthread_id[cpu]; - - set_trigger_mask(TBI_INTS_INIT(thread) | /* interrupts */ - TBI_TRIG_BIT(TBID_SIGNUM_LWK) | /* low level kick */ - TBI_TRIG_BIT(TBID_SIGNUM_SW1)); - - /* non-priv - use current stack */ - int_context.Sig.pCtx = NULL; - /* Start with interrupts off */ - int_context.Sig.TrigMask = INTS_OFF_MASK; - int_context.Sig.SaveMask = 0; - - /* And call __TBIASyncTrigger() */ - __TBIASyncTrigger(int_context); -} - -void __init trap_init(void) -{ - unsigned long cpu = smp_processor_id(); - PTBI _pTBI = per_cpu(pTBI, cpu); - - _pTBI->fnSigs[TBID_SIGNUM_XXF] = fault_handler; - _pTBI->fnSigs[TBID_SIGNUM_SW0] = switchx_handler; - _pTBI->fnSigs[TBID_SIGNUM_SW1] = switch1_handler; - _pTBI->fnSigs[TBID_SIGNUM_SW2] = switchx_handler; - _pTBI->fnSigs[TBID_SIGNUM_SW3] = switchx_handler; - _pTBI->fnSigs[TBID_SIGNUM_LWK] = kick_handler; - -#ifdef CONFIG_METAG_META21 - _pTBI->fnSigs[TBID_SIGNUM_DFR] = __TBIHandleDFR; - _pTBI->fnSigs[TBID_SIGNUM_FPE] = fpe_handler; -#endif - - per_cpu_trap_init(cpu); -} - -void tbi_startup_interrupt(int irq) -{ - unsigned long cpu = smp_processor_id(); - PTBI _pTBI = per_cpu(pTBI, cpu); - - BUG_ON(irq > TBID_SIGNUM_MAX); - - /* For TR1 and TR2, the thread id is encoded in the irq number */ - if (irq >= TBID_SIGNUM_T10 && irq < TBID_SIGNUM_TR3) - cpu = hwthread_id_2_cpu[(irq - TBID_SIGNUM_T10) % 4]; - - set_trigger_mask(get_trigger_mask() | TBI_TRIG_BIT(irq)); - - _pTBI->fnSigs[irq] = trigger_handler; -} - -void tbi_shutdown_interrupt(int irq) -{ - unsigned long cpu = smp_processor_id(); - PTBI _pTBI = per_cpu(pTBI, cpu); - - BUG_ON(irq > TBID_SIGNUM_MAX); - - set_trigger_mask(get_trigger_mask() & ~TBI_TRIG_BIT(irq)); - - _pTBI->fnSigs[irq] = __TBIUnExpXXX; -} - -int ret_from_fork(TBIRES arg) -{ - struct task_struct *prev = arg.Switch.pPara; - struct task_struct *tsk = current; - struct pt_regs *regs = task_pt_regs(tsk); - int (*fn)(void *); - TBIRES Next; - - schedule_tail(prev); - - if (tsk->flags & PF_KTHREAD) { - fn = (void *)regs->ctx.DX[4].U1; - BUG_ON(!fn); - - fn((void *)regs->ctx.DX[3].U1); - } - - if (test_syscall_work()) - syscall_trace_leave(regs); - - preempt_disable(); - - Next.Sig.TrigMask = get_trigger_mask(); - Next.Sig.SaveMask = 0; - Next.Sig.pCtx = ®s->ctx; - - set_gateway_tls(current->thread.tls_ptr); - - preempt_enable_no_resched(); - - /* And interrupts should come back on when we resume the real usermode - * code. Call __TBIASyncResume() - */ - __TBIASyncResume(tail_end(Next)); - /* ASyncResume should NEVER return */ - BUG(); - return 0; -} - -void show_trace(struct task_struct *tsk, unsigned long *sp, - struct pt_regs *regs) -{ - unsigned long addr; -#ifdef CONFIG_FRAME_POINTER - unsigned long fp, fpnew; - unsigned long stack; -#endif - - if (regs && user_mode(regs)) - return; - - printk("\nCall trace: "); -#ifdef CONFIG_KALLSYMS - printk("\n"); -#endif - - if (!tsk) - tsk = current; - -#ifdef CONFIG_FRAME_POINTER - if (regs) { - print_ip_sym(regs->ctx.CurrPC); - fp = regs->ctx.AX[1].U0; - } else { - fp = __core_reg_get(A0FrP); - } - - /* detect when the frame pointer has been used for other purposes and - * doesn't point to the stack (it may point completely elsewhere which - * kstack_end may not detect). - */ - stack = (unsigned long)task_stack_page(tsk); - while (fp >= stack && fp + 8 <= stack + THREAD_SIZE) { - addr = __raw_readl((unsigned long *)(fp + 4)) - 4; - if (kernel_text_address(addr)) - print_ip_sym(addr); - else - break; - /* stack grows up, so frame pointers must decrease */ - fpnew = __raw_readl((unsigned long *)(fp + 0)); - if (fpnew >= fp) - break; - fp = fpnew; - } -#else - while (!kstack_end(sp)) { - addr = (*sp--) - 4; - if (kernel_text_address(addr)) - print_ip_sym(addr); - } -#endif - - printk("\n"); - - debug_show_held_locks(tsk); -} - -void show_stack(struct task_struct *tsk, unsigned long *sp) -{ - if (!tsk) - tsk = current; - if (tsk == current) - sp = (unsigned long *)current_stack_pointer; - else - sp = (unsigned long *)tsk->thread.kernel_context->AX[0].U0; - - show_trace(tsk, sp, NULL); -} diff --git a/arch/metag/kernel/user_gateway.S b/arch/metag/kernel/user_gateway.S deleted file mode 100644 index 7833fb8f9ddd..000000000000 --- a/arch/metag/kernel/user_gateway.S +++ /dev/null @@ -1,98 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * Copyright (C) 2010 Imagination Technologies Ltd. - * - * This file contains code that can be accessed from userspace and can - * access certain kernel data structures without the overhead of a system - * call. - */ - -#include <asm/metag_regs.h> -#include <asm/user_gateway.h> - -/* - * User helpers. - * - * These are segment of kernel provided user code reachable from user space - * at a fixed address in kernel memory. This is used to provide user space - * with some operations which require kernel help because of unimplemented - * native feature and/or instructions in some Meta CPUs. The idea is for - * this code to be executed directly in user mode for best efficiency but - * which is too intimate with the kernel counter part to be left to user - * libraries. The kernel reserves the right to change this code as needed - * without warning. Only the entry points and their results are guaranteed - * to be stable. - * - * Each segment is 64-byte aligned. This mechanism should be used only for - * for things that are really small and justified, and not be abused freely. - */ - .text - .global ___user_gateway_start -___user_gateway_start: - - /* get_tls - * Offset: 0 - * Description: Get the TLS pointer for this process. - */ - .global ___kuser_get_tls - .type ___kuser_get_tls,function -___kuser_get_tls: - MOVT D1Ar1,#HI(USER_GATEWAY_PAGE + USER_GATEWAY_TLS) - ADD D1Ar1,D1Ar1,#LO(USER_GATEWAY_PAGE + USER_GATEWAY_TLS) - MOV D1Ar3,TXENABLE - AND D1Ar3,D1Ar3,#(TXENABLE_THREAD_BITS) - LSR D1Ar3,D1Ar3,#(TXENABLE_THREAD_S - 2) - GETD D0Re0,[D1Ar1+D1Ar3] -___kuser_get_tls_end: /* Beyond this point the read will complete */ - MOV PC,D1RtP - .size ___kuser_get_tls,.-___kuser_get_tls - .global ___kuser_get_tls_end - - /* cmpxchg - * Offset: 64 - * Description: Replace the value at 'ptr' with 'newval' if the current - * value is 'oldval'. Return zero if we succeeded, - * non-zero otherwise. - * - * Reference prototype: - * - * int __kuser_cmpxchg(int oldval, int newval, unsigned long *ptr) - * - */ - .balign 64 - .global ___kuser_cmpxchg - .type ___kuser_cmpxchg,function -___kuser_cmpxchg: -#ifdef CONFIG_SMP - /* - * We must use LNKGET/LNKSET with an SMP kernel because the other method - * does not provide atomicity across multiple CPUs. - */ -0: LNKGETD D0Re0,[D1Ar3] - CMP D0Re0,D1Ar1 - LNKSETDZ [D1Ar3],D0Ar2 - BNZ 1f - DEFR D0Re0,TXSTAT - ANDT D0Re0,D0Re0,#HI(0x3f000000) - CMPT D0Re0,#HI(0x02000000) - BNE 0b -#ifdef CONFIG_METAG_LNKGET_AROUND_CACHE - DCACHE [D1Ar3], D0Re0 -#endif -1: MOV D0Re0,#1 - XORZ D0Re0,D0Re0,D0Re0 - MOV PC,D1RtP -#else - GETD D0Re0,[D1Ar3] - CMP D0Re0,D1Ar1 - SETDZ [D1Ar3],D0Ar2 -___kuser_cmpxchg_end: /* Beyond this point the write will complete */ - MOV D0Re0,#1 - XORZ D0Re0,D0Re0,D0Re0 - MOV PC,D1RtP -#endif /* CONFIG_SMP */ - .size ___kuser_cmpxchg,.-___kuser_cmpxchg - .global ___kuser_cmpxchg_end - - .global ___user_gateway_end -___user_gateway_end: diff --git a/arch/metag/kernel/vmlinux.lds.S b/arch/metag/kernel/vmlinux.lds.S deleted file mode 100644 index 1efadae2ea8e..000000000000 --- a/arch/metag/kernel/vmlinux.lds.S +++ /dev/null @@ -1,74 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* ld script to make Meta Linux kernel */ - -#include <asm/thread_info.h> -#include <asm/page.h> -#include <asm/cache.h> - -#include <asm-generic/vmlinux.lds.h> - -OUTPUT_FORMAT("elf32-metag", "elf32-metag", "elf32-metag") -OUTPUT_ARCH(metag) -ENTRY(__start) - -_jiffies = _jiffies_64; -SECTIONS -{ - . = CONFIG_PAGE_OFFSET; - _text = .; - __text = .; - __stext = .; - HEAD_TEXT_SECTION - .text : { - TEXT_TEXT - SCHED_TEXT - CPUIDLE_TEXT - LOCK_TEXT - KPROBES_TEXT - IRQENTRY_TEXT - SOFTIRQENTRY_TEXT - *(.text.*) - *(.gnu.warning) - } - - __etext = .; /* End of text section */ - - __sdata = .; - RO_DATA_SECTION(PAGE_SIZE) - RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE) - __edata = .; /* End of data section */ - - EXCEPTION_TABLE(16) - NOTES - - . = ALIGN(PAGE_SIZE); /* Init code and data */ - ___init_begin = .; - INIT_TEXT_SECTION(PAGE_SIZE) - INIT_DATA_SECTION(16) - - .init.arch.info : { - ___arch_info_begin = .; - *(.arch.info.init) - ___arch_info_end = .; - } - - PERCPU_SECTION(L1_CACHE_BYTES) - - ___init_end = .; - - BSS_SECTION(0, PAGE_SIZE, 0) - - __end = .; - - . = ALIGN(PAGE_SIZE); - __heap_start = .; - - DWARF_DEBUG - - /* When something in the kernel is NOT compiled as a module, the - * module cleanup code and data are put into these segments. Both - * can then be thrown away, as cleanup code is never called unless - * it's a module. - */ - DISCARDS -} |