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Diffstat (limited to 'arch/tile/kernel/setup.c')
| -rw-r--r-- | arch/tile/kernel/setup.c | 1743 |
1 files changed, 0 insertions, 1743 deletions
diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c deleted file mode 100644 index eb4e198f6f93..000000000000 --- a/arch/tile/kernel/setup.c +++ /dev/null @@ -1,1743 +0,0 @@ -/* - * Copyright 2010 Tilera Corporation. 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 - * as published by the Free Software Foundation, version 2. - * - * 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, GOOD TITLE or - * NON INFRINGEMENT. See the GNU General Public License for - * more details. - */ - -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/mmzone.h> -#include <linux/bootmem.h> -#include <linux/module.h> -#include <linux/node.h> -#include <linux/cpu.h> -#include <linux/ioport.h> -#include <linux/irq.h> -#include <linux/kexec.h> -#include <linux/pci.h> -#include <linux/swiotlb.h> -#include <linux/initrd.h> -#include <linux/io.h> -#include <linux/highmem.h> -#include <linux/smp.h> -#include <linux/timex.h> -#include <linux/hugetlb.h> -#include <linux/start_kernel.h> -#include <linux/screen_info.h> -#include <linux/tick.h> -#include <asm/setup.h> -#include <asm/sections.h> -#include <asm/cacheflush.h> -#include <asm/pgalloc.h> -#include <asm/mmu_context.h> -#include <hv/hypervisor.h> -#include <arch/interrupts.h> - -/* <linux/smp.h> doesn't provide this definition. */ -#ifndef CONFIG_SMP -#define setup_max_cpus 1 -#endif - -static inline int ABS(int x) { return x >= 0 ? x : -x; } - -/* Chip information */ -char chip_model[64] __ro_after_init; - -#ifdef CONFIG_VT -struct screen_info screen_info; -#endif - -struct pglist_data node_data[MAX_NUMNODES] __read_mostly; -EXPORT_SYMBOL(node_data); - -/* Information on the NUMA nodes that we compute early */ -unsigned long node_start_pfn[MAX_NUMNODES]; -unsigned long node_end_pfn[MAX_NUMNODES]; -unsigned long __initdata node_memmap_pfn[MAX_NUMNODES]; -unsigned long __initdata node_percpu_pfn[MAX_NUMNODES]; -unsigned long __initdata node_free_pfn[MAX_NUMNODES]; - -static unsigned long __initdata node_percpu[MAX_NUMNODES]; - -/* - * per-CPU stack and boot info. - */ -DEFINE_PER_CPU(unsigned long, boot_sp) = - (unsigned long)init_stack + THREAD_SIZE - STACK_TOP_DELTA; - -#ifdef CONFIG_SMP -DEFINE_PER_CPU(unsigned long, boot_pc) = (unsigned long)start_kernel; -#else -/* - * The variable must be __initdata since it references __init code. - * With CONFIG_SMP it is per-cpu data, which is exempt from validation. - */ -unsigned long __initdata boot_pc = (unsigned long)start_kernel; -#endif - -#ifdef CONFIG_HIGHMEM -/* Page frame index of end of lowmem on each controller. */ -unsigned long node_lowmem_end_pfn[MAX_NUMNODES]; - -/* Number of pages that can be mapped into lowmem. */ -static unsigned long __initdata mappable_physpages; -#endif - -/* Data on which physical memory controller corresponds to which NUMA node */ -int node_controller[MAX_NUMNODES] = { [0 ... MAX_NUMNODES-1] = -1 }; - -#ifdef CONFIG_HIGHMEM -/* Map information from VAs to PAs */ -unsigned long pbase_map[1 << (32 - HPAGE_SHIFT)] - __ro_after_init __attribute__((aligned(L2_CACHE_BYTES))); -EXPORT_SYMBOL(pbase_map); - -/* Map information from PAs to VAs */ -void *vbase_map[NR_PA_HIGHBIT_VALUES] - __ro_after_init __attribute__((aligned(L2_CACHE_BYTES))); -EXPORT_SYMBOL(vbase_map); -#endif - -/* Node number as a function of the high PA bits */ -int highbits_to_node[NR_PA_HIGHBIT_VALUES] __ro_after_init; -EXPORT_SYMBOL(highbits_to_node); - -static unsigned int __initdata maxmem_pfn = -1U; -static unsigned int __initdata maxnodemem_pfn[MAX_NUMNODES] = { - [0 ... MAX_NUMNODES-1] = -1U -}; -static nodemask_t __initdata isolnodes; - -#if defined(CONFIG_PCI) && !defined(__tilegx__) -enum { DEFAULT_PCI_RESERVE_MB = 64 }; -static unsigned int __initdata pci_reserve_mb = DEFAULT_PCI_RESERVE_MB; -unsigned long __initdata pci_reserve_start_pfn = -1U; -unsigned long __initdata pci_reserve_end_pfn = -1U; -#endif - -static int __init setup_maxmem(char *str) -{ - unsigned long long maxmem; - if (str == NULL || (maxmem = memparse(str, NULL)) == 0) - return -EINVAL; - - maxmem_pfn = (maxmem >> HPAGE_SHIFT) << (HPAGE_SHIFT - PAGE_SHIFT); - pr_info("Forcing RAM used to no more than %dMB\n", - maxmem_pfn >> (20 - PAGE_SHIFT)); - return 0; -} -early_param("maxmem", setup_maxmem); - -static int __init setup_maxnodemem(char *str) -{ - char *endp; - unsigned long long maxnodemem; - unsigned long node; - - node = str ? simple_strtoul(str, &endp, 0) : INT_MAX; - if (node >= MAX_NUMNODES || *endp != ':') - return -EINVAL; - - maxnodemem = memparse(endp+1, NULL); - maxnodemem_pfn[node] = (maxnodemem >> HPAGE_SHIFT) << - (HPAGE_SHIFT - PAGE_SHIFT); - pr_info("Forcing RAM used on node %ld to no more than %dMB\n", - node, maxnodemem_pfn[node] >> (20 - PAGE_SHIFT)); - return 0; -} -early_param("maxnodemem", setup_maxnodemem); - -struct memmap_entry { - u64 addr; /* start of memory segment */ - u64 size; /* size of memory segment */ -}; -static struct memmap_entry memmap_map[64]; -static int memmap_nr; - -static void add_memmap_region(u64 addr, u64 size) -{ - if (memmap_nr >= ARRAY_SIZE(memmap_map)) { - pr_err("Ooops! Too many entries in the memory map!\n"); - return; - } - memmap_map[memmap_nr].addr = addr; - memmap_map[memmap_nr].size = size; - memmap_nr++; -} - -static int __init setup_memmap(char *p) -{ - char *oldp; - u64 start_at, mem_size; - - if (!p) - return -EINVAL; - - if (!strncmp(p, "exactmap", 8)) { - pr_err("\"memmap=exactmap\" not valid on tile\n"); - return 0; - } - - oldp = p; - mem_size = memparse(p, &p); - if (p == oldp) - return -EINVAL; - - if (*p == '@') { - pr_err("\"memmap=nn@ss\" (force RAM) invalid on tile\n"); - } else if (*p == '#') { - pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on tile\n"); - } else if (*p == '$') { - start_at = memparse(p+1, &p); - add_memmap_region(start_at, mem_size); - } else { - if (mem_size == 0) - return -EINVAL; - maxmem_pfn = (mem_size >> HPAGE_SHIFT) << - (HPAGE_SHIFT - PAGE_SHIFT); - } - return *p == '\0' ? 0 : -EINVAL; -} -early_param("memmap", setup_memmap); - -static int __init setup_mem(char *str) -{ - return setup_maxmem(str); -} -early_param("mem", setup_mem); /* compatibility with x86 */ - -static int __init setup_isolnodes(char *str) -{ - if (str == NULL || nodelist_parse(str, isolnodes) != 0) - return -EINVAL; - - pr_info("Set isolnodes value to '%*pbl'\n", - nodemask_pr_args(&isolnodes)); - return 0; -} -early_param("isolnodes", setup_isolnodes); - -#if defined(CONFIG_PCI) && !defined(__tilegx__) -static int __init setup_pci_reserve(char* str) -{ - if (str == NULL || kstrtouint(str, 0, &pci_reserve_mb) != 0 || - pci_reserve_mb > 3 * 1024) - return -EINVAL; - - pr_info("Reserving %dMB for PCIE root complex mappings\n", - pci_reserve_mb); - return 0; -} -early_param("pci_reserve", setup_pci_reserve); -#endif - -#ifndef __tilegx__ -/* - * vmalloc=size forces the vmalloc area to be exactly 'size' bytes. - * This can be used to increase (or decrease) the vmalloc area. - */ -static int __init parse_vmalloc(char *arg) -{ - if (!arg) - return -EINVAL; - - VMALLOC_RESERVE = (memparse(arg, &arg) + PGDIR_SIZE - 1) & PGDIR_MASK; - - /* See validate_va() for more on this test. */ - if ((long)_VMALLOC_START >= 0) - early_panic("\"vmalloc=%#lx\" value too large: maximum %#lx\n", - VMALLOC_RESERVE, _VMALLOC_END - 0x80000000UL); - - return 0; -} -early_param("vmalloc", parse_vmalloc); -#endif - -#ifdef CONFIG_HIGHMEM -/* - * Determine for each controller where its lowmem is mapped and how much of - * it is mapped there. On controller zero, the first few megabytes are - * already mapped in as code at MEM_SV_START, so in principle we could - * start our data mappings higher up, but for now we don't bother, to avoid - * additional confusion. - * - * One question is whether, on systems with more than 768 Mb and - * controllers of different sizes, to map in a proportionate amount of - * each one, or to try to map the same amount from each controller. - * (E.g. if we have three controllers with 256MB, 1GB, and 256MB - * respectively, do we map 256MB from each, or do we map 128 MB, 512 - * MB, and 128 MB respectively?) For now we use a proportionate - * solution like the latter. - * - * The VA/PA mapping demands that we align our decisions at 16 MB - * boundaries so that we can rapidly convert VA to PA. - */ -static void *__init setup_pa_va_mapping(void) -{ - unsigned long curr_pages = 0; - unsigned long vaddr = PAGE_OFFSET; - nodemask_t highonlynodes = isolnodes; - int i, j; - - memset(pbase_map, -1, sizeof(pbase_map)); - memset(vbase_map, -1, sizeof(vbase_map)); - - /* Node zero cannot be isolated for LOWMEM purposes. */ - node_clear(0, highonlynodes); - - /* Count up the number of pages on non-highonlynodes controllers. */ - mappable_physpages = 0; - for_each_online_node(i) { - if (!node_isset(i, highonlynodes)) - mappable_physpages += - node_end_pfn[i] - node_start_pfn[i]; - } - - for_each_online_node(i) { - unsigned long start = node_start_pfn[i]; - unsigned long end = node_end_pfn[i]; - unsigned long size = end - start; - unsigned long vaddr_end; - - if (node_isset(i, highonlynodes)) { - /* Mark this controller as having no lowmem. */ - node_lowmem_end_pfn[i] = start; - continue; - } - - curr_pages += size; - if (mappable_physpages > MAXMEM_PFN) { - vaddr_end = PAGE_OFFSET + - (((u64)curr_pages * MAXMEM_PFN / - mappable_physpages) - << PAGE_SHIFT); - } else { - vaddr_end = PAGE_OFFSET + (curr_pages << PAGE_SHIFT); - } - for (j = 0; vaddr < vaddr_end; vaddr += HPAGE_SIZE, ++j) { - unsigned long this_pfn = - start + (j << HUGETLB_PAGE_ORDER); - pbase_map[vaddr >> HPAGE_SHIFT] = this_pfn; - if (vbase_map[__pfn_to_highbits(this_pfn)] == - (void *)-1) - vbase_map[__pfn_to_highbits(this_pfn)] = - (void *)(vaddr & HPAGE_MASK); - } - node_lowmem_end_pfn[i] = start + (j << HUGETLB_PAGE_ORDER); - BUG_ON(node_lowmem_end_pfn[i] > end); - } - - /* Return highest address of any mapped memory. */ - return (void *)vaddr; -} -#endif /* CONFIG_HIGHMEM */ - -/* - * Register our most important memory mappings with the debug stub. - * - * This is up to 4 mappings for lowmem, one mapping per memory - * controller, plus one for our text segment. - */ -static void store_permanent_mappings(void) -{ - int i; - - for_each_online_node(i) { - HV_PhysAddr pa = ((HV_PhysAddr)node_start_pfn[i]) << PAGE_SHIFT; -#ifdef CONFIG_HIGHMEM - HV_PhysAddr high_mapped_pa = node_lowmem_end_pfn[i]; -#else - HV_PhysAddr high_mapped_pa = node_end_pfn[i]; -#endif - - unsigned long pages = high_mapped_pa - node_start_pfn[i]; - HV_VirtAddr addr = (HV_VirtAddr) __va(pa); - hv_store_mapping(addr, pages << PAGE_SHIFT, pa); - } - - hv_store_mapping((HV_VirtAddr)_text, - (uint32_t)(_einittext - _text), 0); -} - -/* - * Use hv_inquire_physical() to populate node_{start,end}_pfn[] - * and node_online_map, doing suitable sanity-checking. - * Also set min_low_pfn, max_low_pfn, and max_pfn. - */ -static void __init setup_memory(void) -{ - int i, j; - int highbits_seen[NR_PA_HIGHBIT_VALUES] = { 0 }; -#ifdef CONFIG_HIGHMEM - long highmem_pages; -#endif -#ifndef __tilegx__ - int cap; -#endif -#if defined(CONFIG_HIGHMEM) || defined(__tilegx__) - long lowmem_pages; -#endif - unsigned long physpages = 0; - - /* We are using a char to hold the cpu_2_node[] mapping */ - BUILD_BUG_ON(MAX_NUMNODES > 127); - - /* Discover the ranges of memory available to us */ - for (i = 0; ; ++i) { - unsigned long start, size, end, highbits; - HV_PhysAddrRange range = hv_inquire_physical(i); - if (range.size == 0) - break; -#ifdef CONFIG_FLATMEM - if (i > 0) { - pr_err("Can't use discontiguous PAs: %#llx..%#llx\n", - range.size, range.start + range.size); - continue; - } -#endif -#ifndef __tilegx__ - if ((unsigned long)range.start) { - pr_err("Range not at 4GB multiple: %#llx..%#llx\n", - range.start, range.start + range.size); - continue; - } -#endif - if ((range.start & (HPAGE_SIZE-1)) != 0 || - (range.size & (HPAGE_SIZE-1)) != 0) { - unsigned long long start_pa = range.start; - unsigned long long orig_size = range.size; - range.start = (start_pa + HPAGE_SIZE - 1) & HPAGE_MASK; - range.size -= (range.start - start_pa); - range.size &= HPAGE_MASK; - pr_err("Range not hugepage-aligned: %#llx..%#llx: now %#llx-%#llx\n", - start_pa, start_pa + orig_size, - range.start, range.start + range.size); - } - highbits = __pa_to_highbits(range.start); - if (highbits >= NR_PA_HIGHBIT_VALUES) { - pr_err("PA high bits too high: %#llx..%#llx\n", - range.start, range.start + range.size); - continue; - } - if (highbits_seen[highbits]) { - pr_err("Range overlaps in high bits: %#llx..%#llx\n", - range.start, range.start + range.size); - continue; - } - highbits_seen[highbits] = 1; - if (PFN_DOWN(range.size) > maxnodemem_pfn[i]) { - int max_size = maxnodemem_pfn[i]; - if (max_size > 0) { - pr_err("Maxnodemem reduced node %d to %d pages\n", - i, max_size); - range.size = PFN_PHYS(max_size); - } else { - pr_err("Maxnodemem disabled node %d\n", i); - continue; - } - } - if (physpages + PFN_DOWN(range.size) > maxmem_pfn) { - int max_size = maxmem_pfn - physpages; - if (max_size > 0) { - pr_err("Maxmem reduced node %d to %d pages\n", - i, max_size); - range.size = PFN_PHYS(max_size); - } else { - pr_err("Maxmem disabled node %d\n", i); - continue; - } - } - if (i >= MAX_NUMNODES) { - pr_err("Too many PA nodes (#%d): %#llx...%#llx\n", - i, range.size, range.size + range.start); - continue; - } - - start = range.start >> PAGE_SHIFT; - size = range.size >> PAGE_SHIFT; - end = start + size; - -#ifndef __tilegx__ - if (((HV_PhysAddr)end << PAGE_SHIFT) != - (range.start + range.size)) { - pr_err("PAs too high to represent: %#llx..%#llx\n", - range.start, range.start + range.size); - continue; - } -#endif -#if defined(CONFIG_PCI) && !defined(__tilegx__) - /* - * Blocks that overlap the pci reserved region must - * have enough space to hold the maximum percpu data - * region at the top of the range. If there isn't - * enough space above the reserved region, just - * truncate the node. - */ - if (start <= pci_reserve_start_pfn && - end > pci_reserve_start_pfn) { - unsigned int per_cpu_size = - __per_cpu_end - __per_cpu_start; - unsigned int percpu_pages = - NR_CPUS * (PFN_UP(per_cpu_size) >> PAGE_SHIFT); - if (end < pci_reserve_end_pfn + percpu_pages) { - end = pci_reserve_start_pfn; - pr_err("PCI mapping region reduced node %d to %ld pages\n", - i, end - start); - } - } -#endif - - for (j = __pfn_to_highbits(start); - j <= __pfn_to_highbits(end - 1); j++) - highbits_to_node[j] = i; - - node_start_pfn[i] = start; - node_end_pfn[i] = end; - node_controller[i] = range.controller; - physpages += size; - max_pfn = end; - - /* Mark node as online */ - node_set(i, node_online_map); - node_set(i, node_possible_map); - } - -#ifndef __tilegx__ - /* - * For 4KB pages, mem_map "struct page" data is 1% of the size - * of the physical memory, so can be quite big (640 MB for - * four 16G zones). These structures must be mapped in - * lowmem, and since we currently cap out at about 768 MB, - * it's impractical to try to use this much address space. - * For now, arbitrarily cap the amount of physical memory - * we're willing to use at 8 million pages (32GB of 4KB pages). - */ - cap = 8 * 1024 * 1024; /* 8 million pages */ - if (physpages > cap) { - int num_nodes = num_online_nodes(); - int cap_each = cap / num_nodes; - unsigned long dropped_pages = 0; - for (i = 0; i < num_nodes; ++i) { - int size = node_end_pfn[i] - node_start_pfn[i]; - if (size > cap_each) { - dropped_pages += (size - cap_each); - node_end_pfn[i] = node_start_pfn[i] + cap_each; - } - } - physpages -= dropped_pages; - pr_warn("Only using %ldMB memory - ignoring %ldMB\n", - physpages >> (20 - PAGE_SHIFT), - dropped_pages >> (20 - PAGE_SHIFT)); - pr_warn("Consider using a larger page size\n"); - } -#endif - - /* Heap starts just above the last loaded address. */ - min_low_pfn = PFN_UP((unsigned long)_end - PAGE_OFFSET); - -#ifdef CONFIG_HIGHMEM - /* Find where we map lowmem from each controller. */ - high_memory = setup_pa_va_mapping(); - - /* Set max_low_pfn based on what node 0 can directly address. */ - max_low_pfn = node_lowmem_end_pfn[0]; - - lowmem_pages = (mappable_physpages > MAXMEM_PFN) ? - MAXMEM_PFN : mappable_physpages; - highmem_pages = (long) (physpages - lowmem_pages); - - pr_notice("%ldMB HIGHMEM available\n", - pages_to_mb(highmem_pages > 0 ? highmem_pages : 0)); - pr_notice("%ldMB LOWMEM available\n", pages_to_mb(lowmem_pages)); -#else - /* Set max_low_pfn based on what node 0 can directly address. */ - max_low_pfn = node_end_pfn[0]; - -#ifndef __tilegx__ - if (node_end_pfn[0] > MAXMEM_PFN) { - pr_warn("Only using %ldMB LOWMEM\n", MAXMEM >> 20); - pr_warn("Use a HIGHMEM enabled kernel\n"); - max_low_pfn = MAXMEM_PFN; - max_pfn = MAXMEM_PFN; - node_end_pfn[0] = MAXMEM_PFN; - } else { - pr_notice("%ldMB memory available\n", - pages_to_mb(node_end_pfn[0])); - } - for (i = 1; i < MAX_NUMNODES; ++i) { - node_start_pfn[i] = 0; - node_end_pfn[i] = 0; - } - high_memory = __va(node_end_pfn[0]); -#else - lowmem_pages = 0; - for (i = 0; i < MAX_NUMNODES; ++i) { - int pages = node_end_pfn[i] - node_start_pfn[i]; - lowmem_pages += pages; - if (pages) - high_memory = pfn_to_kaddr(node_end_pfn[i]); - } - pr_notice("%ldMB memory available\n", pages_to_mb(lowmem_pages)); -#endif -#endif -} - -/* - * On 32-bit machines, we only put bootmem on the low controller, - * since PAs > 4GB can't be used in bootmem. In principle one could - * imagine, e.g., multiple 1 GB controllers all of which could support - * bootmem, but in practice using controllers this small isn't a - * particularly interesting scenario, so we just keep it simple and - * use only the first controller for bootmem on 32-bit machines. - */ -static inline int node_has_bootmem(int nid) -{ -#ifdef CONFIG_64BIT - return 1; -#else - return nid == 0; -#endif -} - -static inline unsigned long alloc_bootmem_pfn(int nid, - unsigned long size, - unsigned long goal) -{ - void *kva = __alloc_bootmem_node(NODE_DATA(nid), size, - PAGE_SIZE, goal); - unsigned long pfn = kaddr_to_pfn(kva); - BUG_ON(goal && PFN_PHYS(pfn) != goal); - return pfn; -} - -static void __init setup_bootmem_allocator_node(int i) -{ - unsigned long start, end, mapsize, mapstart; - - if (node_has_bootmem(i)) { - NODE_DATA(i)->bdata = &bootmem_node_data[i]; - } else { - /* Share controller zero's bdata for now. */ - NODE_DATA(i)->bdata = &bootmem_node_data[0]; - return; - } - - /* Skip up to after the bss in node 0. */ - start = (i == 0) ? min_low_pfn : node_start_pfn[i]; - - /* Only lowmem, if we're a HIGHMEM build. */ -#ifdef CONFIG_HIGHMEM - end = node_lowmem_end_pfn[i]; -#else - end = node_end_pfn[i]; -#endif - - /* No memory here. */ - if (end == start) - return; - - /* Figure out where the bootmem bitmap is located. */ - mapsize = bootmem_bootmap_pages(end - start); - if (i == 0) { - /* Use some space right before the heap on node 0. */ - mapstart = start; - start += mapsize; - } else { - /* Allocate bitmap on node 0 to avoid page table issues. */ - mapstart = alloc_bootmem_pfn(0, PFN_PHYS(mapsize), 0); - } - - /* Initialize a node. */ - init_bootmem_node(NODE_DATA(i), mapstart, start, end); - - /* Free all the space back into the allocator. */ - free_bootmem(PFN_PHYS(start), PFN_PHYS(end - start)); - -#if defined(CONFIG_PCI) && !defined(__tilegx__) - /* - * Throw away any memory aliased by the PCI region. - */ - if (pci_reserve_start_pfn < end && pci_reserve_end_pfn > start) { - start = max(pci_reserve_start_pfn, start); - end = min(pci_reserve_end_pfn, end); - reserve_bootmem(PFN_PHYS(start), PFN_PHYS(end - start), - BOOTMEM_EXCLUSIVE); - } -#endif -} - -static void __init setup_bootmem_allocator(void) -{ - int i; - for (i = 0; i < MAX_NUMNODES; ++i) - setup_bootmem_allocator_node(i); - - /* Reserve any memory excluded by "memmap" arguments. */ - for (i = 0; i < memmap_nr; ++i) { - struct memmap_entry *m = &memmap_map[i]; - reserve_bootmem(m->addr, m->size, BOOTMEM_DEFAULT); - } - -#ifdef CONFIG_BLK_DEV_INITRD - if (initrd_start) { - /* Make sure the initrd memory region is not modified. */ - if (reserve_bootmem(initrd_start, initrd_end - initrd_start, - BOOTMEM_EXCLUSIVE)) { - pr_crit("The initrd memory region has been polluted. Disabling it.\n"); - initrd_start = 0; - initrd_end = 0; - } else { - /* - * Translate initrd_start & initrd_end from PA to VA for - * future access. - */ - initrd_start += PAGE_OFFSET; - initrd_end += PAGE_OFFSET; - } - } -#endif - -#ifdef CONFIG_KEXEC - if (crashk_res.start != crashk_res.end) - reserve_bootmem(crashk_res.start, resource_size(&crashk_res), - BOOTMEM_DEFAULT); -#endif -} - -void *__init alloc_remap(int nid, unsigned long size) -{ - int pages = node_end_pfn[nid] - node_start_pfn[nid]; - void *map = pfn_to_kaddr(node_memmap_pfn[nid]); - BUG_ON(size != pages * sizeof(struct page)); - memset(map, 0, size); - return map; -} - -static int __init percpu_size(void) -{ - int size = __per_cpu_end - __per_cpu_start; - size += PERCPU_MODULE_RESERVE; - size += PERCPU_DYNAMIC_EARLY_SIZE; - if (size < PCPU_MIN_UNIT_SIZE) - size = PCPU_MIN_UNIT_SIZE; - size = roundup(size, PAGE_SIZE); - - /* In several places we assume the per-cpu data fits on a huge page. */ - BUG_ON(kdata_huge && size > HPAGE_SIZE); - return size; -} - -static void __init zone_sizes_init(void) -{ - unsigned long zones_size[MAX_NR_ZONES] = { 0 }; - int size = percpu_size(); - int num_cpus = smp_height * smp_width; - const unsigned long dma_end = (1UL << (32 - PAGE_SHIFT)); - - int i; - - for (i = 0; i < num_cpus; ++i) - node_percpu[cpu_to_node(i)] += size; - - for_each_online_node(i) { - unsigned long start = node_start_pfn[i]; - unsigned long end = node_end_pfn[i]; -#ifdef CONFIG_HIGHMEM - unsigned long lowmem_end = node_lowmem_end_pfn[i]; -#else - unsigned long lowmem_end = end; -#endif - int memmap_size = (end - start) * sizeof(struct page); - node_free_pfn[i] = start; - - /* - * Set aside pages for per-cpu data and the mem_map array. - * - * Since the per-cpu data requires special homecaching, - * if we are in kdata_huge mode, we put it at the end of - * the lowmem region. If we're not in kdata_huge mode, - * we take the per-cpu pages from the bottom of the - * controller, since that avoids fragmenting a huge page - * that users might want. We always take the memmap - * from the bottom of the controller, since with - * kdata_huge that lets it be under a huge TLB entry. - * - * If the user has requested isolnodes for a controller, - * though, there'll be no lowmem, so we just alloc_bootmem - * the memmap. There will be no percpu memory either. - */ - if (i != 0 && node_isset(i, isolnodes)) { - node_memmap_pfn[i] = - alloc_bootmem_pfn(0, memmap_size, 0); - BUG_ON(node_percpu[i] != 0); - } else if (node_has_bootmem(start)) { - unsigned long goal = 0; - node_memmap_pfn[i] = - alloc_bootmem_pfn(i, memmap_size, 0); - if (kdata_huge) - goal = PFN_PHYS(lowmem_end) - node_percpu[i]; - if (node_percpu[i]) - node_percpu_pfn[i] = - alloc_bootmem_pfn(i, node_percpu[i], - goal); - } else { - /* In non-bootmem zones, just reserve some pages. */ - node_memmap_pfn[i] = node_free_pfn[i]; - node_free_pfn[i] += PFN_UP(memmap_size); - if (!kdata_huge) { - node_percpu_pfn[i] = node_free_pfn[i]; - node_free_pfn[i] += PFN_UP(node_percpu[i]); - } else { - node_percpu_pfn[i] = - lowmem_end - PFN_UP(node_percpu[i]); - } - } - -#ifdef CONFIG_HIGHMEM - if (start > lowmem_end) { - zones_size[ZONE_NORMAL] = 0; - zones_size[ZONE_HIGHMEM] = end - start; - } else { - zones_size[ZONE_NORMAL] = lowmem_end - start; - zones_size[ZONE_HIGHMEM] = end - lowmem_end; - } -#else - zones_size[ZONE_NORMAL] = end - start; -#endif - - if (start < dma_end) { - zones_size[ZONE_DMA32] = min(zones_size[ZONE_NORMAL], - dma_end - start); - zones_size[ZONE_NORMAL] -= zones_size[ZONE_DMA32]; - } else { - zones_size[ZONE_DMA32] = 0; - } - - /* Take zone metadata from controller 0 if we're isolnode. */ - if (node_isset(i, isolnodes)) - NODE_DATA(i)->bdata = &bootmem_node_data[0]; - - free_area_init_node(i, zones_size, start, NULL); - printk(KERN_DEBUG " Normal zone: %ld per-cpu pages\n", - PFN_UP(node_percpu[i])); - - /* Track the type of memory on each node */ - if (zones_size[ZONE_NORMAL] || zones_size[ZONE_DMA32]) - node_set_state(i, N_NORMAL_MEMORY); -#ifdef CONFIG_HIGHMEM - if (end != start) - node_set_state(i, N_HIGH_MEMORY); -#endif - - node_set_online(i); - } -} - -#ifdef CONFIG_NUMA - -/* which logical CPUs are on which nodes */ -struct cpumask node_2_cpu_mask[MAX_NUMNODES] __ro_after_init; -EXPORT_SYMBOL(node_2_cpu_mask); - -/* which node each logical CPU is on */ -char cpu_2_node[NR_CPUS] __ro_after_init __attribute__((aligned(L2_CACHE_BYTES))); -EXPORT_SYMBOL(cpu_2_node); - -/* Return cpu_to_node() except for cpus not yet assigned, which return -1 */ -static int __init cpu_to_bound_node(int cpu, struct cpumask* unbound_cpus) -{ - if (!cpu_possible(cpu) || cpumask_test_cpu(cpu, unbound_cpus)) - return -1; - else - return cpu_to_node(cpu); -} - -/* Return number of immediately-adjacent tiles sharing the same NUMA node. */ -static int __init node_neighbors(int node, int cpu, - struct cpumask *unbound_cpus) -{ - int neighbors = 0; - int w = smp_width; - int h = smp_height; - int x = cpu % w; - int y = cpu / w; - if (x > 0 && cpu_to_bound_node(cpu-1, unbound_cpus) == node) - ++neighbors; - if (x < w-1 && cpu_to_bound_node(cpu+1, unbound_cpus) == node) - ++neighbors; - if (y > 0 && cpu_to_bound_node(cpu-w, unbound_cpus) == node) - ++neighbors; - if (y < h-1 && cpu_to_bound_node(cpu+w, unbound_cpus) == node) - ++neighbors; - return neighbors; -} - -static void __init setup_numa_mapping(void) -{ - u8 distance[MAX_NUMNODES][NR_CPUS]; - HV_Coord coord; - int cpu, node, cpus, i, x, y; - int num_nodes = num_online_nodes(); - struct cpumask unbound_cpus; - nodemask_t default_nodes; - - cpumask_clear(&unbound_cpus); - - /* Get set of nodes we will use for defaults */ - nodes_andnot(default_nodes, node_online_map, isolnodes); - if (nodes_empty(default_nodes)) { - BUG_ON(!node_isset(0, node_online_map)); - pr_err("Forcing NUMA node zero available as a default node\n"); - node_set(0, default_nodes); - } - - /* Populate the distance[] array */ - memset(distance, -1, sizeof(distance)); - cpu = 0; - for (coord.y = 0; coord.y < smp_height; ++coord.y) { - for (coord.x = 0; coord.x < smp_width; - ++coord.x, ++cpu) { - BUG_ON(cpu >= nr_cpu_ids); - if (!cpu_possible(cpu)) { - cpu_2_node[cpu] = -1; - continue; - } - for_each_node_mask(node, default_nodes) { - HV_MemoryControllerInfo info = - hv_inquire_memory_controller( - coord, node_controller[node]); - distance[node][cpu] = - ABS(info.coord.x) + ABS(info.coord.y); - } - cpumask_set_cpu(cpu, &unbound_cpus); - } - } - cpus = cpu; - - /* - * Round-robin through the NUMA nodes until all the cpus are - * assigned. We could be more clever here (e.g. create four - * sorted linked lists on the same set of cpu nodes, and pull - * off them in round-robin sequence, removing from all four - * lists each time) but given the relatively small numbers - * involved, O(n^2) seem OK for a one-time cost. - */ - node = first_node(default_nodes); - while (!cpumask_empty(&unbound_cpus)) { - int best_cpu = -1; - int best_distance = INT_MAX; - for (cpu = 0; cpu < cpus; ++cpu) { - if (cpumask_test_cpu(cpu, &unbound_cpus)) { - /* - * Compute metric, which is how much - * closer the cpu is to this memory - * controller than the others, shifted - * up, and then the number of - * neighbors already in the node as an - * epsilon adjustment to try to keep - * the nodes compact. - */ - int d = distance[node][cpu] * num_nodes; - for_each_node_mask(i, default_nodes) { - if (i != node) - d -= distance[i][cpu]; - } - d *= 8; /* allow space for epsilon */ - d -= node_neighbors(node, cpu, &unbound_cpus); - if (d < best_distance) { - best_cpu = cpu; - best_distance = d; - } - } - } - BUG_ON(best_cpu < 0); - cpumask_set_cpu(best_cpu, &node_2_cpu_mask[node]); - cpu_2_node[best_cpu] = node; - cpumask_clear_cpu(best_cpu, &unbound_cpus); - node = next_node_in(node, default_nodes); - } - - /* Print out node assignments and set defaults for disabled cpus */ - cpu = 0; - for (y = 0; y < smp_height; ++y) { - printk(KERN_DEBUG "NUMA cpu-to-node row %d:", y); - for (x = 0; x < smp_width; ++x, ++cpu) { - if (cpu_to_node(cpu) < 0) { - pr_cont(" -"); - cpu_2_node[cpu] = first_node(default_nodes); - } else { - pr_cont(" %d", cpu_to_node(cpu)); - } - } - pr_cont("\n"); - } -} - -static struct cpu cpu_devices[NR_CPUS]; - -static int __init topology_init(void) -{ - int i; - - for_each_online_node(i) - register_one_node(i); - - for (i = 0; i < smp_height * smp_width; ++i) - register_cpu(&cpu_devices[i], i); - - return 0; -} - -subsys_initcall(topology_init); - -#else /* !CONFIG_NUMA */ - -#define setup_numa_mapping() do { } while (0) - -#endif /* CONFIG_NUMA */ - -/* - * Initialize hugepage support on this cpu. We do this on all cores - * early in boot: before argument parsing for the boot cpu, and after - * argument parsing but before the init functions run on the secondaries. - * So the values we set up here in the hypervisor may be overridden on - * the boot cpu as arguments are parsed. - */ -static void init_super_pages(void) -{ -#ifdef CONFIG_HUGETLB_SUPER_PAGES - int i; - for (i = 0; i < HUGE_SHIFT_ENTRIES; ++i) - hv_set_pte_super_shift(i, huge_shift[i]); -#endif -} - -/** - * setup_cpu() - Do all necessary per-cpu, tile-specific initialization. - * @boot: Is this the boot cpu? - * - * Called from setup_arch() on the boot cpu, or online_secondary(). - */ -void setup_cpu(int boot) -{ - /* The boot cpu sets up its permanent mappings much earlier. */ - if (!boot) - store_permanent_mappings(); - - /* Allow asynchronous TLB interrupts. */ -#if CHIP_HAS_TILE_DMA() - arch_local_irq_unmask(INT_DMATLB_MISS); - arch_local_irq_unmask(INT_DMATLB_ACCESS); -#endif -#ifdef __tilegx__ - arch_local_irq_unmask(INT_SINGLE_STEP_K); -#endif - - /* - * Allow user access to many generic SPRs, like the cycle - * counter, PASS/FAIL/DONE, INTERRUPT_CRITICAL_SECTION, etc. - */ - __insn_mtspr(SPR_MPL_WORLD_ACCESS_SET_0, 1); - -#if CHIP_HAS_SN() - /* Static network is not restricted. */ - __insn_mtspr(SPR_MPL_SN_ACCESS_SET_0, 1); -#endif - - /* - * Set the MPL for interrupt control 0 & 1 to the corresponding - * values. This includes access to the SYSTEM_SAVE and EX_CONTEXT - * SPRs, as well as the interrupt mask. - */ - __insn_mtspr(SPR_MPL_INTCTRL_0_SET_0, 1); - __insn_mtspr(SPR_MPL_INTCTRL_1_SET_1, 1); - - /* Initialize IRQ support for this cpu. */ - setup_irq_regs(); - -#ifdef CONFIG_HARDWALL - /* Reset the network state on this cpu. */ - reset_network_state(); -#endif - - init_super_pages(); -} - -#ifdef CONFIG_BLK_DEV_INITRD - -static int __initdata set_initramfs_file; -static char __initdata initramfs_file[128] = "initramfs"; - -static int __init setup_initramfs_file(char *str) -{ - if (str == NULL) - return -EINVAL; - strncpy(initramfs_file, str, sizeof(initramfs_file) - 1); - set_initramfs_file = 1; - - return 0; -} -early_param("initramfs_file", setup_initramfs_file); - -/* - * We look for a file called "initramfs" in the hvfs. If there is one, we - * allocate some memory for it and it will be unpacked to the initramfs. - * If it's compressed, the initd code will uncompress it first. - */ -static void __init load_hv_initrd(void) -{ - HV_FS_StatInfo stat; - int fd, rc; - void *initrd; - - /* If initrd has already been set, skip initramfs file in hvfs. */ - if (initrd_start) - return; - - fd = hv_fs_findfile((HV_VirtAddr) initramfs_file); - if (fd == HV_ENOENT) { - if (set_initramfs_file) { - pr_warn("No such hvfs initramfs file '%s'\n", - initramfs_file); - return; - } else { - /* Try old backwards-compatible name. */ - fd = hv_fs_findfile((HV_VirtAddr)"initramfs.cpio.gz"); - if (fd == HV_ENOENT) - return; - } - } - BUG_ON(fd < 0); - stat = hv_fs_fstat(fd); - BUG_ON(stat.size < 0); - if (stat.flags & HV_FS_ISDIR) { - pr_warn("Ignoring hvfs file '%s': it's a directory\n", - initramfs_file); - return; - } - initrd = alloc_bootmem_pages(stat.size); - rc = hv_fs_pread(fd, (HV_VirtAddr) initrd, stat.size, 0); - if (rc != stat.size) { - pr_err("Error reading %d bytes from hvfs file '%s': %d\n", - stat.size, initramfs_file, rc); - free_initrd_mem((unsigned long) initrd, stat.size); - return; - } - initrd_start = (unsigned long) initrd; - initrd_end = initrd_start + stat.size; -} - -void __init free_initrd_mem(unsigned long begin, unsigned long end) -{ - free_bootmem_late(__pa(begin), end - begin); -} - -static int __init setup_initrd(char *str) -{ - char *endp; - unsigned long initrd_size; - - initrd_size = str ? simple_strtoul(str, &endp, 0) : 0; - if (initrd_size == 0 || *endp != '@') - return -EINVAL; - - initrd_start = simple_strtoul(endp+1, &endp, 0); - if (initrd_start == 0) - return -EINVAL; - - initrd_end = initrd_start + initrd_size; - - return 0; -} -early_param("initrd", setup_initrd); - -#else -static inline void load_hv_initrd(void) {} -#endif /* CONFIG_BLK_DEV_INITRD */ - -static void __init validate_hv(void) -{ - /* - * It may already be too late, but let's check our built-in - * configuration against what the hypervisor is providing. - */ - unsigned long glue_size = hv_sysconf(HV_SYSCONF_GLUE_SIZE); - int hv_page_size = hv_sysconf(HV_SYSCONF_PAGE_SIZE_SMALL); - int hv_hpage_size = hv_sysconf(HV_SYSCONF_PAGE_SIZE_LARGE); - HV_ASIDRange asid_range; - -#ifndef CONFIG_SMP - HV_Topology topology = hv_inquire_topology(); - BUG_ON(topology.coord.x != 0 || topology.coord.y != 0); - if (topology.width != 1 || topology.height != 1) { - pr_warn("Warning: booting UP kernel on %dx%d grid; will ignore all but first tile\n", - topology.width, topology.height); - } -#endif - - if (PAGE_OFFSET + HV_GLUE_START_CPA + glue_size > (unsigned long)_text) - early_panic("Hypervisor glue size %ld is too big!\n", - glue_size); - if (hv_page_size != PAGE_SIZE) - early_panic("Hypervisor page size %#x != our %#lx\n", - hv_page_size, PAGE_SIZE); - if (hv_hpage_size != HPAGE_SIZE) - early_panic("Hypervisor huge page size %#x != our %#lx\n", - hv_hpage_size, HPAGE_SIZE); - -#ifdef CONFIG_SMP - /* - * Some hypervisor APIs take a pointer to a bitmap array - * whose size is at least the number of cpus on the chip. - * We use a struct cpumask for this, so it must be big enough. - */ - if ((smp_height * smp_width) > nr_cpu_ids) - early_panic("Hypervisor %d x %d grid too big for Linux NR_CPUS %u\n", - smp_height, smp_width, nr_cpu_ids); -#endif - - /* - * Check that we're using allowed ASIDs, and initialize the - * various asid variables to their appropriate initial states. - */ - asid_range = hv_inquire_asid(0); - min_asid = asid_range.start; - __this_cpu_write(current_asid, min_asid); - max_asid = asid_range.start + asid_range.size - 1; - - if (hv_confstr(HV_CONFSTR_CHIP_MODEL, (HV_VirtAddr)chip_model, - sizeof(chip_model)) < 0) { - pr_err("Warning: HV_CONFSTR_CHIP_MODEL not available\n"); - strlcpy(chip_model, "unknown", sizeof(chip_model)); - } -} - -static void __init validate_va(void) -{ -#ifndef __tilegx__ /* FIXME: GX: probably some validation relevant here */ - /* - * Similarly, make sure we're only using allowed VAs. - * We assume we can contiguously use MEM_USER_INTRPT .. MEM_HV_START, - * and 0 .. KERNEL_HIGH_VADDR. - * In addition, make sure we CAN'T use the end of memory, since - * we use the last chunk of each pgd for the pgd_list. - */ - int i, user_kernel_ok = 0; - unsigned long max_va = 0; - unsigned long list_va = - ((PGD_LIST_OFFSET / sizeof(pgd_t)) << PGDIR_SHIFT); - - for (i = 0; ; ++i) { - HV_VirtAddrRange range = hv_inquire_virtual(i); - if (range.size == 0) - break; - if (range.start <= MEM_USER_INTRPT && - range.start + range.size >= MEM_HV_START) - user_kernel_ok = 1; - if (range.start == 0) - max_va = range.size; - BUG_ON(range.start + range.size > list_va); - } - if (!user_kernel_ok) - early_panic("Hypervisor not configured for user/kernel VAs\n"); - if (max_va == 0) - early_panic("Hypervisor not configured for low VAs\n"); - if (max_va < KERNEL_HIGH_VADDR) - early_panic("Hypervisor max VA %#lx smaller than %#lx\n", - max_va, KERNEL_HIGH_VADDR); - - /* Kernel PCs must have their high bit set; see intvec.S. */ - if ((long)VMALLOC_START >= 0) - early_panic("Linux VMALLOC region below the 2GB line (%#lx)!\n" - "Reconfigure the kernel with smaller VMALLOC_RESERVE\n", - VMALLOC_START); -#endif -} - -/* - * cpu_lotar_map lists all the cpus that are valid for the supervisor - * to cache data on at a page level, i.e. what cpus can be placed in - * the LOTAR field of a PTE. It is equivalent to the set of possible - * cpus plus any other cpus that are willing to share their cache. - * It is set by hv_inquire_tiles(HV_INQ_TILES_LOTAR). - */ -struct cpumask __ro_after_init cpu_lotar_map; -EXPORT_SYMBOL(cpu_lotar_map); - -/* - * hash_for_home_map lists all the tiles that hash-for-home data - * will be cached on. Note that this may includes tiles that are not - * valid for this supervisor to use otherwise (e.g. if a hypervisor - * device is being shared between multiple supervisors). - * It is set by hv_inquire_tiles(HV_INQ_TILES_HFH_CACHE). - */ -struct cpumask hash_for_home_map; -EXPORT_SYMBOL(hash_for_home_map); - -/* - * cpu_cacheable_map lists all the cpus whose caches the hypervisor can - * flush on our behalf. It is set to cpu_possible_mask OR'ed with - * hash_for_home_map, and it is what should be passed to - * hv_flush_remote() to flush all caches. Note that if there are - * dedicated hypervisor driver tiles that have authorized use of their - * cache, those tiles will only appear in cpu_lotar_map, NOT in - * cpu_cacheable_map, as they are a special case. - */ -struct cpumask __ro_after_init cpu_cacheable_map; -EXPORT_SYMBOL(cpu_cacheable_map); - -static __initdata struct cpumask disabled_map; - -static int __init disabled_cpus(char *str) -{ - int boot_cpu = smp_processor_id(); - - if (str == NULL || cpulist_parse_crop(str, &disabled_map) != 0) - return -EINVAL; - if (cpumask_test_cpu(boot_cpu, &disabled_map)) { - pr_err("disabled_cpus: can't disable boot cpu %d\n", boot_cpu); - cpumask_clear_cpu(boot_cpu, &disabled_map); - } - return 0; -} - -early_param("disabled_cpus", disabled_cpus); - -void __init print_disabled_cpus(void) -{ - if (!cpumask_empty(&disabled_map)) - pr_info("CPUs not available for Linux: %*pbl\n", - cpumask_pr_args(&disabled_map)); -} - -static void __init setup_cpu_maps(void) -{ - struct cpumask hv_disabled_map, cpu_possible_init; - int boot_cpu = smp_processor_id(); - int cpus, i, rc; - - /* Learn which cpus are allowed by the hypervisor. */ - rc = hv_inquire_tiles(HV_INQ_TILES_AVAIL, - (HV_VirtAddr) cpumask_bits(&cpu_possible_init), - sizeof(cpu_cacheable_map)); - if (rc < 0) - early_panic("hv_inquire_tiles(AVAIL) failed: rc %d\n", rc); - if (!cpumask_test_cpu(boot_cpu, &cpu_possible_init)) - early_panic("Boot CPU %d disabled by hypervisor!\n", boot_cpu); - - /* Compute the cpus disabled by the hvconfig file. */ - cpumask_complement(&hv_disabled_map, &cpu_possible_init); - - /* Include them with the cpus disabled by "disabled_cpus". */ - cpumask_or(&disabled_map, &disabled_map, &hv_disabled_map); - - /* - * Disable every cpu after "setup_max_cpus". But don't mark - * as disabled the cpus that are outside of our initial rectangle, - * since that turns out to be confusing. - */ - cpus = 1; /* this cpu */ - cpumask_set_cpu(boot_cpu, &disabled_map); /* ignore this cpu */ - for (i = 0; cpus < setup_max_cpus; ++i) - if (!cpumask_test_cpu(i, &disabled_map)) - ++cpus; - for (; i < smp_height * smp_width; ++i) - cpumask_set_cpu(i, &disabled_map); - cpumask_clear_cpu(boot_cpu, &disabled_map); /* reset this cpu */ - for (i = smp_height * smp_width; i < NR_CPUS; ++i) - cpumask_clear_cpu(i, &disabled_map); - - /* - * Setup cpu_possible map as every cpu allocated to us, minus - * the results of any "disabled_cpus" settings. - */ - cpumask_andnot(&cpu_possible_init, &cpu_possible_init, &disabled_map); - init_cpu_possible(&cpu_possible_init); - - /* Learn which cpus are valid for LOTAR caching. */ - rc = hv_inquire_tiles(HV_INQ_TILES_LOTAR, - (HV_VirtAddr) cpumask_bits(&cpu_lotar_map), - sizeof(cpu_lotar_map)); - if (rc < 0) { - pr_err("warning: no HV_INQ_TILES_LOTAR; using AVAIL\n"); - cpu_lotar_map = *cpu_possible_mask; - } - - /* Retrieve set of CPUs used for hash-for-home caching */ - rc = hv_inquire_tiles(HV_INQ_TILES_HFH_CACHE, - (HV_VirtAddr) hash_for_home_map.bits, - sizeof(hash_for_home_map)); - if (rc < 0) - early_panic("hv_inquire_tiles(HFH_CACHE) failed: rc %d\n", rc); - cpumask_or(&cpu_cacheable_map, cpu_possible_mask, &hash_for_home_map); -} - - -static int __init dataplane(char *str) -{ - pr_warn("WARNING: dataplane support disabled in this kernel\n"); - return 0; -} - -early_param("dataplane", dataplane); - -#ifdef CONFIG_NO_HZ_FULL -/* Warn if hypervisor shared cpus are marked as nohz_full. */ -static int __init check_nohz_full_cpus(void) -{ - struct cpumask shared; - int cpu; - - if (hv_inquire_tiles(HV_INQ_TILES_SHARED, - (HV_VirtAddr) shared.bits, sizeof(shared)) < 0) { - pr_warn("WARNING: No support for inquiring hv shared tiles\n"); - return 0; - } - for_each_cpu(cpu, &shared) { - if (tick_nohz_full_cpu(cpu)) - pr_warn("WARNING: nohz_full cpu %d receives hypervisor interrupts!\n", - cpu); - } - return 0; -} -arch_initcall(check_nohz_full_cpus); -#endif - -#ifdef CONFIG_CMDLINE_BOOL -static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; -#endif - -void __init setup_arch(char **cmdline_p) -{ - int len; - -#if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE) - len = hv_get_command_line((HV_VirtAddr) boot_command_line, - COMMAND_LINE_SIZE); - if (boot_command_line[0]) - pr_warn("WARNING: ignoring dynamic command line \"%s\"\n", - boot_command_line); - strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); -#else - char *hv_cmdline; -#if defined(CONFIG_CMDLINE_BOOL) - if (builtin_cmdline[0]) { - int builtin_len = strlcpy(boot_command_line, builtin_cmdline, - COMMAND_LINE_SIZE); - if (builtin_len < COMMAND_LINE_SIZE-1) - boot_command_line[builtin_len++] = ' '; - hv_cmdline = &boot_command_line[builtin_len]; - len = COMMAND_LINE_SIZE - builtin_len; - } else -#endif - { - hv_cmdline = boot_command_line; - len = COMMAND_LINE_SIZE; - } - len = hv_get_command_line((HV_VirtAddr) hv_cmdline, len); - if (len < 0 || len > COMMAND_LINE_SIZE) - early_panic("hv_get_command_line failed: %d\n", len); -#endif - - *cmdline_p = boot_command_line; - - /* Set disabled_map and setup_max_cpus very early */ - parse_early_param(); - - /* Make sure the kernel is compatible with the hypervisor. */ - validate_hv(); - validate_va(); - - setup_cpu_maps(); - - -#if defined(CONFIG_PCI) && !defined(__tilegx__) - /* - * Initialize the PCI structures. This is done before memory - * setup so that we know whether or not a pci_reserve region - * is necessary. - */ - if (tile_pci_init() == 0) - pci_reserve_mb = 0; - - /* PCI systems reserve a region just below 4GB for mapping iomem. */ - pci_reserve_end_pfn = (1 << (32 - PAGE_SHIFT)); - pci_reserve_start_pfn = pci_reserve_end_pfn - - (pci_reserve_mb << (20 - PAGE_SHIFT)); -#endif - - init_mm.start_code = (unsigned long) _text; - init_mm.end_code = (unsigned long) _etext; - init_mm.end_data = (unsigned long) _edata; - init_mm.brk = (unsigned long) _end; - - setup_memory(); - store_permanent_mappings(); - setup_bootmem_allocator(); - - /* - * NOTE: before this point _nobody_ is allowed to allocate - * any memory using the bootmem allocator. - */ - -#ifdef CONFIG_SWIOTLB - swiotlb_init(0); -#endif - - paging_init(); - setup_numa_mapping(); - zone_sizes_init(); - set_page_homes(); - setup_cpu(1); - setup_clock(); - load_hv_initrd(); -} - - -/* - * Set up per-cpu memory. - */ - -unsigned long __per_cpu_offset[NR_CPUS] __ro_after_init; -EXPORT_SYMBOL(__per_cpu_offset); - -static size_t __initdata pfn_offset[MAX_NUMNODES] = { 0 }; -static unsigned long __initdata percpu_pfn[NR_CPUS] = { 0 }; - -/* - * As the percpu code allocates pages, we return the pages from the - * end of the node for the specified cpu. - */ -static void *__init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align) -{ - int nid = cpu_to_node(cpu); - unsigned long pfn = node_percpu_pfn[nid] + pfn_offset[nid]; - - BUG_ON(size % PAGE_SIZE != 0); - pfn_offset[nid] += size / PAGE_SIZE; - BUG_ON(node_percpu[nid] < size); - node_percpu[nid] -= size; - if (percpu_pfn[cpu] == 0) - percpu_pfn[cpu] = pfn; - return pfn_to_kaddr(pfn); -} - -/* - * Pages reserved for percpu memory are not freeable, and in any case we are - * on a short path to panic() in setup_per_cpu_area() at this point anyway. - */ -static void __init pcpu_fc_free(void *ptr, size_t size) -{ -} - -/* - * Set up vmalloc page tables using bootmem for the percpu code. - */ -static void __init pcpu_fc_populate_pte(unsigned long addr) -{ - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - pte_t *pte; - - BUG_ON(pgd_addr_invalid(addr)); - if (addr < VMALLOC_START || addr >= VMALLOC_END) - panic("PCPU addr %#lx outside vmalloc range %#lx..%#lx; try increasing CONFIG_VMALLOC_RESERVE\n", - addr, VMALLOC_START, VMALLOC_END); - - pgd = swapper_pg_dir + pgd_index(addr); - pud = pud_offset(pgd, addr); - BUG_ON(!pud_present(*pud)); - pmd = pmd_offset(pud, addr); - if (pmd_present(*pmd)) { - BUG_ON(pmd_huge_page(*pmd)); - } else { - pte = __alloc_bootmem(L2_KERNEL_PGTABLE_SIZE, - HV_PAGE_TABLE_ALIGN, 0); - pmd_populate_kernel(&init_mm, pmd, pte); - } -} - -void __init setup_per_cpu_areas(void) -{ - struct page *pg; - unsigned long delta, pfn, lowmem_va; - unsigned long size = percpu_size(); - char *ptr; - int rc, cpu, i; - - rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, pcpu_fc_alloc, - pcpu_fc_free, pcpu_fc_populate_pte); - if (rc < 0) - panic("Cannot initialize percpu area (err=%d)", rc); - - delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; - for_each_possible_cpu(cpu) { - __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu]; - - /* finv the copy out of cache so we can change homecache */ - ptr = pcpu_base_addr + pcpu_unit_offsets[cpu]; - __finv_buffer(ptr, size); - pfn = percpu_pfn[cpu]; - - /* Rewrite the page tables to cache on that cpu */ - pg = pfn_to_page(pfn); - for (i = 0; i < size; i += PAGE_SIZE, ++pfn, ++pg) { - - /* Update the vmalloc mapping and page home. */ - unsigned long addr = (unsigned long)ptr + i; - pte_t *ptep = virt_to_kpte(addr); - pte_t pte = *ptep; - BUG_ON(pfn != pte_pfn(pte)); - pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_TILE_L3); - pte = set_remote_cache_cpu(pte, cpu); - set_pte_at(&init_mm, addr, ptep, pte); - - /* Update the lowmem mapping for consistency. */ - lowmem_va = (unsigned long)pfn_to_kaddr(pfn); - ptep = virt_to_kpte(lowmem_va); - if (pte_huge(*ptep)) { - printk(KERN_DEBUG "early shatter of huge page at %#lx\n", - lowmem_va); - shatter_pmd((pmd_t *)ptep); - ptep = virt_to_kpte(lowmem_va); - BUG_ON(pte_huge(*ptep)); - } - BUG_ON(pfn != pte_pfn(*ptep)); - set_pte_at(&init_mm, lowmem_va, ptep, pte); - } - } - - /* Set our thread pointer appropriately. */ - set_my_cpu_offset(__per_cpu_offset[smp_processor_id()]); - - /* Make sure the finv's have completed. */ - mb_incoherent(); - - /* Flush the TLB so we reference it properly from here on out. */ - local_flush_tlb_all(); -} - -static struct resource data_resource = { - .name = "Kernel data", - .start = 0, - .end = 0, - .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM -}; - -static struct resource code_resource = { - .name = "Kernel code", - .start = 0, - .end = 0, - .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM -}; - -/* - * On Pro, we reserve all resources above 4GB so that PCI won't try to put - * mappings above 4GB. - */ -#if defined(CONFIG_PCI) && !defined(__tilegx__) -static struct resource* __init -insert_non_bus_resource(void) -{ - struct resource *res = - kzalloc(sizeof(struct resource), GFP_ATOMIC); - if (!res) - return NULL; - res->name = "Non-Bus Physical Address Space"; - res->start = (1ULL << 32); - res->end = -1LL; - res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; - if (insert_resource(&iomem_resource, res)) { - kfree(res); - return NULL; - } - return res; -} -#endif - -static struct resource* __init -insert_ram_resource(u64 start_pfn, u64 end_pfn, bool reserved) -{ - struct resource *res = - kzalloc(sizeof(struct resource), GFP_ATOMIC); - if (!res) - return NULL; - res->start = start_pfn << PAGE_SHIFT; - res->end = (end_pfn << PAGE_SHIFT) - 1; - res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; - if (reserved) { - res->name = "Reserved"; - } else { - res->name = "System RAM"; - res->flags |= IORESOURCE_SYSRAM; - } - if (insert_resource(&iomem_resource, res)) { - kfree(res); - return NULL; - } - return res; -} - -/* - * Request address space for all standard resources - * - * If the system includes PCI root complex drivers, we need to create - * a window just below 4GB where PCI BARs can be mapped. - */ -static int __init request_standard_resources(void) -{ - int i; - enum { CODE_DELTA = MEM_SV_START - PAGE_OFFSET }; - -#if defined(CONFIG_PCI) && !defined(__tilegx__) - insert_non_bus_resource(); -#endif - - for_each_online_node(i) { - u64 start_pfn = node_start_pfn[i]; - u64 end_pfn = node_end_pfn[i]; - -#if defined(CONFIG_PCI) && !defined(__tilegx__) - if (start_pfn <= pci_reserve_start_pfn && - end_pfn > pci_reserve_start_pfn) { - if (end_pfn > pci_reserve_end_pfn) - insert_ram_resource(pci_reserve_end_pfn, - end_pfn, 0); - end_pfn = pci_reserve_start_pfn; - } -#endif - insert_ram_resource(start_pfn, end_pfn, 0); - } - - code_resource.start = __pa(_text - CODE_DELTA); - code_resource.end = __pa(_etext - CODE_DELTA)-1; - data_resource.start = __pa(_sdata); - data_resource.end = __pa(_end)-1; - - insert_resource(&iomem_resource, &code_resource); - insert_resource(&iomem_resource, &data_resource); - - /* Mark any "memmap" regions busy for the resource manager. */ - for (i = 0; i < memmap_nr; ++i) { - struct memmap_entry *m = &memmap_map[i]; - insert_ram_resource(PFN_DOWN(m->addr), - PFN_UP(m->addr + m->size - 1), 1); - } - -#ifdef CONFIG_KEXEC - insert_resource(&iomem_resource, &crashk_res); -#endif - - return 0; -} - -subsys_initcall(request_standard_resources); |