Merge tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

Pul removal of obsolete architecture ports from Arnd Bergmann:
 "This removes the entire architecture code for blackfin, cris, frv,
  m32r, metag, mn10300, score, and tile, including the associated device
  drivers.

  I have been working with the (former) maintainers for each one to
  ensure that my interpretation was right and the code is definitely
  unused in mainline kernels. Many had fond memories of working on the
  respective ports to start with and getting them included in upstream,
  but also saw no point in keeping the port alive without any users.

  In the end, it seems that while the eight architectures are extremely
  different, they all suffered the same fate: There was one company in
  charge of an SoC line, a CPU microarchitecture and a software
  ecosystem, which was more costly than licensing newer off-the-shelf
  CPU cores from a third party (typically ARM, MIPS, or RISC-V). It
  seems that all the SoC product lines are still around, but have not
  used the custom CPU architectures for several years at this point. In
  contrast, CPU instruction sets that remain popular and have actively
  maintained kernel ports tend to all be used across multiple licensees.

  [ See the new nds32 port merged in the previous commit for the next
    generation of "one company in charge of an SoC line, a CPU
    microarchitecture and a software ecosystem"   - Linus ]

  The removal came out of a discussion that is now documented at
  https://lwn.net/Articles/748074/. Unlike the original plans, I'm not
  marking any ports as deprecated but remove them all at once after I
  made sure that they are all unused. Some architectures (notably tile,
  mn10300, and blackfin) are still being shipped in products with old
  kernels, but those products will never be updated to newer kernel
  releases.

  After this series, we still have a few architectures without mainline
  gcc support:

   - unicore32 and hexagon both have very outdated gcc releases, but the
     maintainers promised to work on providing something newer. At least
     in case of hexagon, this will only be llvm, not gcc.

   - openrisc, risc-v and nds32 are still in the process of finishing
     their support or getting it added to mainline gcc in the first
     place. They all have patched gcc-7.3 ports that work to some
     degree, but complete upstream support won't happen before gcc-8.1.
     Csky posted their first kernel patch set last week, their situation
     will be similar

  [ Palmer Dabbelt points out that RISC-V support is in mainline gcc
    since gcc-7, although gcc-7.3.0 is the recommended minimum  - Linus ]"

This really says it all:

 2498 files changed, 95 insertions(+), 467668 deletions(-)

* tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (74 commits)
  MAINTAINERS: UNICORE32: Change email account
  staging: iio: remove iio-trig-bfin-timer driver
  tty: hvc: remove tile driver
  tty: remove bfin_jtag_comm and hvc_bfin_jtag drivers
  serial: remove tile uart driver
  serial: remove m32r_sio driver
  serial: remove blackfin drivers
  serial: remove cris/etrax uart drivers
  usb: Remove Blackfin references in USB support
  usb: isp1362: remove blackfin arch glue
  usb: musb: remove blackfin port
  usb: host: remove tilegx platform glue
  pwm: remove pwm-bfin driver
  i2c: remove bfin-twi driver
  spi: remove blackfin related host drivers
  watchdog: remove bfin_wdt driver
  can: remove bfin_can driver
  mmc: remove bfin_sdh driver
  input: misc: remove blackfin rotary driver
  input: keyboard: remove bf54x driver
  ...

1 files changed, 0 insertions, 421 deletions

diff --git a/arch/tile/kernel/traps.c b/arch/tile/kernel/traps.c
deleted file mode 100644
index 83a7186198d7..000000000000
--- a/arch/tile/kernel/traps.c
+++ /dev/null
@@ -1,421 +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/sched/debug.h>
-#include <linux/kernel.h>
-#include <linux/kprobes.h>
-#include <linux/kdebug.h>
-#include <linux/module.h>
-#include <linux/reboot.h>
-#include <linux/uaccess.h>
-#include <linux/ptrace.h>
-#include <linux/hardirq.h>
-#include <linux/nmi.h>
-#include <asm/stack.h>
-#include <asm/traps.h>
-#include <asm/setup.h>
-
-#include <arch/interrupts.h>
-#include <arch/spr_def.h>
-#include <arch/opcode.h>
-
-void __init trap_init(void)
-{
-	/* Nothing needed here since we link code at .intrpt */
-}
-
-int unaligned_fixup = 1;
-
-static int __init setup_unaligned_fixup(char *str)
-{
-	/*
-	 * Say "=-1" to completely disable it.  If you just do "=0", we
-	 * will still parse the instruction, then fire a SIGBUS with
-	 * the correct address from inside the single_step code.
-	 */
-	if (kstrtoint(str, 0, &unaligned_fixup) != 0)
-		return 0;
-
-	pr_info("Fixups for unaligned data accesses are %s\n",
-		unaligned_fixup >= 0 ?
-		(unaligned_fixup ? "enabled" : "disabled") :
-		"completely disabled");
-	return 1;
-}
-__setup("unaligned_fixup=", setup_unaligned_fixup);
-
-#if CHIP_HAS_TILE_DMA()
-
-static int dma_disabled;
-
-static int __init nodma(char *str)
-{
-	pr_info("User-space DMA is disabled\n");
-	dma_disabled = 1;
-	return 1;
-}
-__setup("nodma", nodma);
-
-/* How to decode SPR_GPV_REASON */
-#define IRET_ERROR (1U << 31)
-#define MT_ERROR   (1U << 30)
-#define MF_ERROR   (1U << 29)
-#define SPR_INDEX  ((1U << 15) - 1)
-#define SPR_MPL_SHIFT  9  /* starting bit position for MPL encoded in SPR */
-
-/*
- * See if this GPV is just to notify the kernel of SPR use and we can
- * retry the user instruction after adjusting some MPLs suitably.
- */
-static int retry_gpv(unsigned int gpv_reason)
-{
-	int mpl;
-
-	if (gpv_reason & IRET_ERROR)
-		return 0;
-
-	BUG_ON((gpv_reason & (MT_ERROR|MF_ERROR)) == 0);
-	mpl = (gpv_reason & SPR_INDEX) >> SPR_MPL_SHIFT;
-	if (mpl == INT_DMA_NOTIFY && !dma_disabled) {
-		/* User is turning on DMA. Allow it and retry. */
-		printk(KERN_DEBUG "Process %d/%s is now enabled for DMA\n",
-		       current->pid, current->comm);
-		BUG_ON(current->thread.tile_dma_state.enabled);
-		current->thread.tile_dma_state.enabled = 1;
-		grant_dma_mpls();
-		return 1;
-	}
-
-	return 0;
-}
-
-#endif /* CHIP_HAS_TILE_DMA() */
-
-extern tile_bundle_bits bpt_code;
-
-asm(".pushsection .rodata.bpt_code,\"a\";"
-    ".align 8;"
-    "bpt_code: bpt;"
-    ".size bpt_code,.-bpt_code;"
-    ".popsection");
-
-static int special_ill(tile_bundle_bits bundle, int *sigp, int *codep)
-{
-	int sig, code, maxcode;
-
-	if (bundle == bpt_code) {
-		*sigp = SIGTRAP;
-		*codep = TRAP_BRKPT;
-		return 1;
-	}
-
-	/* If it's a "raise" bundle, then "ill" must be in pipe X1. */
-#ifdef __tilegx__
-	if ((bundle & TILEGX_BUNDLE_MODE_MASK) != 0)
-		return 0;
-	if (get_Opcode_X1(bundle) != RRR_0_OPCODE_X1)
-		return 0;
-	if (get_RRROpcodeExtension_X1(bundle) != UNARY_RRR_0_OPCODE_X1)
-		return 0;
-	if (get_UnaryOpcodeExtension_X1(bundle) != ILL_UNARY_OPCODE_X1)
-		return 0;
-#else
-	if (bundle & TILEPRO_BUNDLE_Y_ENCODING_MASK)
-		return 0;
-	if (get_Opcode_X1(bundle) != SHUN_0_OPCODE_X1)
-		return 0;
-	if (get_UnShOpcodeExtension_X1(bundle) != UN_0_SHUN_0_OPCODE_X1)
-		return 0;
-	if (get_UnOpcodeExtension_X1(bundle) != ILL_UN_0_SHUN_0_OPCODE_X1)
-		return 0;
-#endif
-
-	/* Check that the magic distinguishers are set to mean "raise". */
-	if (get_Dest_X1(bundle) != 29 || get_SrcA_X1(bundle) != 37)
-		return 0;
-
-	/* There must be an "addli zero, zero, VAL" in X0. */
-	if (get_Opcode_X0(bundle) != ADDLI_OPCODE_X0)
-		return 0;
-	if (get_Dest_X0(bundle) != TREG_ZERO)
-		return 0;
-	if (get_SrcA_X0(bundle) != TREG_ZERO)
-		return 0;
-
-	/*
-	 * Validate the proposed signal number and si_code value.
-	 * Note that we embed these in the static instruction itself
-	 * so that we perturb the register state as little as possible
-	 * at the time of the actual fault; it's unlikely you'd ever
-	 * need to dynamically choose which kind of fault to raise
-	 * from user space.
-	 */
-	sig = get_Imm16_X0(bundle) & 0x3f;
-	switch (sig) {
-	case SIGILL:
-		maxcode = NSIGILL;
-		break;
-	case SIGFPE:
-		maxcode = NSIGFPE;
-		break;
-	case SIGSEGV:
-		maxcode = NSIGSEGV;
-		break;
-	case SIGBUS:
-		maxcode = NSIGBUS;
-		break;
-	case SIGTRAP:
-		maxcode = NSIGTRAP;
-		break;
-	default:
-		return 0;
-	}
-	code = (get_Imm16_X0(bundle) >> 6) & 0xf;
-	if (code <= 0 || code > maxcode)
-		return 0;
-
-	/* Make it the requested signal. */
-	*sigp = sig;
-	*codep = code;
-	return 1;
-}
-
-static const char *const int_name[] = {
-	[INT_MEM_ERROR] = "Memory error",
-	[INT_ILL] = "Illegal instruction",
-	[INT_GPV] = "General protection violation",
-	[INT_UDN_ACCESS] = "UDN access",
-	[INT_IDN_ACCESS] = "IDN access",
-#if CHIP_HAS_SN()
-	[INT_SN_ACCESS] = "SN access",
-#endif
-	[INT_SWINT_3] = "Software interrupt 3",
-	[INT_SWINT_2] = "Software interrupt 2",
-	[INT_SWINT_0] = "Software interrupt 0",
-	[INT_UNALIGN_DATA] = "Unaligned data",
-	[INT_DOUBLE_FAULT] = "Double fault",
-#ifdef __tilegx__
-	[INT_ILL_TRANS] = "Illegal virtual address",
-#endif
-};
-
-static int do_bpt(struct pt_regs *regs)
-{
-	unsigned long bundle, bcode, bpt;
-
-	bundle = *(unsigned long *)instruction_pointer(regs);
-
-	/*
-	 * bpt shoule be { bpt; nop }, which is 0x286a44ae51485000ULL.
-	 * we encode the unused least significant bits for other purpose.
-	 */
-	bpt = bundle & ~((1ULL << 12) - 1);
-	if (bpt != TILE_BPT_BUNDLE)
-		return 0;
-
-	bcode = bundle & ((1ULL << 12) - 1);
-	/*
-	 * notify the kprobe handlers, if instruction is likely to
-	 * pertain to them.
-	 */
-	switch (bcode) {
-	/* breakpoint_insn */
-	case 0:
-		notify_die(DIE_BREAK, "debug", regs, bundle,
-			INT_ILL, SIGTRAP);
-		break;
-	/* compiled_bpt */
-	case DIE_COMPILED_BPT:
-		notify_die(DIE_COMPILED_BPT, "debug", regs, bundle,
-			INT_ILL, SIGTRAP);
-		break;
-	/* breakpoint2_insn */
-	case DIE_SSTEPBP:
-		notify_die(DIE_SSTEPBP, "single_step", regs, bundle,
-			INT_ILL, SIGTRAP);
-		break;
-	default:
-		return 0;
-	}
-
-	return 1;
-}
-
-void __kprobes do_trap(struct pt_regs *regs, int fault_num,
-		       unsigned long reason)
-{
-	siginfo_t info;
-	int signo, code;
-	unsigned long address = 0;
-	tile_bundle_bits instr;
-	int is_kernel = !user_mode(regs);
-
-	clear_siginfo(&info);
-
-	/* Handle breakpoints, etc. */
-	if (is_kernel && fault_num == INT_ILL && do_bpt(regs))
-		return;
-
-	/* Re-enable interrupts, if they were previously enabled. */
-	if (!(regs->flags & PT_FLAGS_DISABLE_IRQ))
-		local_irq_enable();
-
-	/*
-	 * If it hits in kernel mode and we can't fix it up, just exit the
-	 * current process and hope for the best.
-	 */
-	if (is_kernel) {
-		const char *name;
-		char buf[100];
-		if (fixup_exception(regs))  /* ILL_TRANS or UNALIGN_DATA */
-			return;
-		if (fault_num >= 0 &&
-		    fault_num < ARRAY_SIZE(int_name) &&
-		    int_name[fault_num] != NULL)
-			name = int_name[fault_num];
-		else
-			name = "Unknown interrupt";
-		if (fault_num == INT_GPV)
-			snprintf(buf, sizeof(buf), "; GPV_REASON %#lx", reason);
-#ifdef __tilegx__
-		else if (fault_num == INT_ILL_TRANS)
-			snprintf(buf, sizeof(buf), "; address %#lx", reason);
-#endif
-		else
-			buf[0] = '\0';
-		pr_alert("Kernel took bad trap %d (%s) at PC %#lx%s\n",
-			 fault_num, name, regs->pc, buf);
-		show_regs(regs);
-		do_exit(SIGKILL);  /* FIXME: implement i386 die() */
-	}
-
-	switch (fault_num) {
-	case INT_MEM_ERROR:
-		signo = SIGBUS;
-		code = BUS_OBJERR;
-		break;
-	case INT_ILL:
-		if (copy_from_user(&instr, (void __user *)regs->pc,
-				   sizeof(instr))) {
-			pr_err("Unreadable instruction for INT_ILL: %#lx\n",
-			       regs->pc);
-			do_exit(SIGKILL);
-		}
-		if (!special_ill(instr, &signo, &code)) {
-			signo = SIGILL;
-			code = ILL_ILLOPC;
-		}
-		address = regs->pc;
-		break;
-	case INT_GPV:
-#if CHIP_HAS_TILE_DMA()
-		if (retry_gpv(reason))
-			return;
-#endif
-		/*FALLTHROUGH*/
-	case INT_UDN_ACCESS:
-	case INT_IDN_ACCESS:
-#if CHIP_HAS_SN()
-	case INT_SN_ACCESS:
-#endif
-		signo = SIGILL;
-		code = ILL_PRVREG;
-		address = regs->pc;
-		break;
-	case INT_SWINT_3:
-	case INT_SWINT_2:
-	case INT_SWINT_0:
-		signo = SIGILL;
-		code = ILL_ILLTRP;
-		address = regs->pc;
-		break;
-	case INT_UNALIGN_DATA:
-#ifndef __tilegx__  /* Emulated support for single step debugging */
-		if (unaligned_fixup >= 0) {
-			struct single_step_state *state =
-				current_thread_info()->step_state;
-			if (!state ||
-			    (void __user *)(regs->pc) != state->buffer) {
-				single_step_once(regs);
-				return;
-			}
-		}
-#endif
-		signo = SIGBUS;
-		code = BUS_ADRALN;
-		address = 0;
-		break;
-	case INT_DOUBLE_FAULT:
-		/*
-		 * For double fault, "reason" is actually passed as
-		 * SYSTEM_SAVE_K_2, the hypervisor's double-fault info, so
-		 * we can provide the original fault number rather than
-		 * the uninteresting "INT_DOUBLE_FAULT" so the user can
-		 * learn what actually struck while PL0 ICS was set.
-		 */
-		fault_num = reason;
-		signo = SIGILL;
-		code = ILL_DBLFLT;
-		address = regs->pc;
-		break;
-#ifdef __tilegx__
-	case INT_ILL_TRANS: {
-		/* Avoid a hardware erratum with the return address stack. */
-		fill_ra_stack();
-
-		signo = SIGSEGV;
-		address = reason;
-		code = SEGV_MAPERR;
-		break;
-	}
-#endif
-	default:
-		panic("Unexpected do_trap interrupt number %d", fault_num);
-	}
-
-	info.si_signo = signo;
-	info.si_code = code;
-	info.si_addr = (void __user *)address;
-	if (signo == SIGILL)
-		info.si_trapno = fault_num;
-	if (signo != SIGTRAP)
-		trace_unhandled_signal("trap", regs, address, signo);
-	force_sig_info(signo, &info, current);
-}
-
-void do_nmi(struct pt_regs *regs, int fault_num, unsigned long reason)
-{
-	nmi_enter();
-	switch (reason) {
-#ifdef arch_trigger_cpumask_backtrace
-	case TILE_NMI_DUMP_STACK:
-		nmi_cpu_backtrace(regs);
-		break;
-#endif
-	default:
-		panic("Unexpected do_nmi type %ld", reason);
-	}
-	nmi_exit();
-}
-
-/* Deprecated function currently only used here. */
-extern void _dump_stack(int dummy, ulong pc, ulong lr, ulong sp, ulong r52);
-
-void kernel_double_fault(int dummy, ulong pc, ulong lr, ulong sp, ulong r52)
-{
-	_dump_stack(dummy, pc, lr, sp, r52);
-	pr_emerg("Double fault: exiting\n");
-	machine_halt();
-}