summaryrefslogtreecommitdiffstats
path: root/arch/tile/kernel/process.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/tile/kernel/process.c')
-rw-r--r--arch/tile/kernel/process.c659
1 files changed, 0 insertions, 659 deletions
diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
deleted file mode 100644
index f0a0e18e4dfb..000000000000
--- a/arch/tile/kernel/process.c
+++ /dev/null
@@ -1,659 +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/sched/task.h>
-#include <linux/sched/task_stack.h>
-#include <linux/preempt.h>
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/kprobes.h>
-#include <linux/elfcore.h>
-#include <linux/tick.h>
-#include <linux/init.h>
-#include <linux/mm.h>
-#include <linux/compat.h>
-#include <linux/nmi.h>
-#include <linux/syscalls.h>
-#include <linux/kernel.h>
-#include <linux/tracehook.h>
-#include <linux/signal.h>
-#include <linux/delay.h>
-#include <linux/context_tracking.h>
-#include <asm/stack.h>
-#include <asm/switch_to.h>
-#include <asm/homecache.h>
-#include <asm/syscalls.h>
-#include <asm/traps.h>
-#include <asm/setup.h>
-#include <linux/uaccess.h>
-#ifdef CONFIG_HARDWALL
-#include <asm/hardwall.h>
-#endif
-#include <arch/chip.h>
-#include <arch/abi.h>
-#include <arch/sim_def.h>
-
-/*
- * Use the (x86) "idle=poll" option to prefer low latency when leaving the
- * idle loop over low power while in the idle loop, e.g. if we have
- * one thread per core and we want to get threads out of futex waits fast.
- */
-static int __init idle_setup(char *str)
-{
- if (!str)
- return -EINVAL;
-
- if (!strcmp(str, "poll")) {
- pr_info("using polling idle threads\n");
- cpu_idle_poll_ctrl(true);
- return 0;
- } else if (!strcmp(str, "halt")) {
- return 0;
- }
- return -1;
-}
-early_param("idle", idle_setup);
-
-void arch_cpu_idle(void)
-{
- __this_cpu_write(irq_stat.idle_timestamp, jiffies);
- _cpu_idle();
-}
-
-/*
- * Release a thread_info structure
- */
-void arch_release_thread_stack(unsigned long *stack)
-{
- struct thread_info *info = (void *)stack;
- struct single_step_state *step_state = info->step_state;
-
- if (step_state) {
-
- /*
- * FIXME: we don't munmap step_state->buffer
- * because the mm_struct for this process (info->task->mm)
- * has already been zeroed in exit_mm(). Keeping a
- * reference to it here seems like a bad move, so this
- * means we can't munmap() the buffer, and therefore if we
- * ptrace multiple threads in a process, we will slowly
- * leak user memory. (Note that as soon as the last
- * thread in a process dies, we will reclaim all user
- * memory including single-step buffers in the usual way.)
- * We should either assign a kernel VA to this buffer
- * somehow, or we should associate the buffer(s) with the
- * mm itself so we can clean them up that way.
- */
- kfree(step_state);
- }
-}
-
-static void save_arch_state(struct thread_struct *t);
-
-int copy_thread(unsigned long clone_flags, unsigned long sp,
- unsigned long arg, struct task_struct *p)
-{
- struct pt_regs *childregs = task_pt_regs(p);
- unsigned long ksp;
- unsigned long *callee_regs;
-
- /*
- * Set up the stack and stack pointer appropriately for the
- * new child to find itself woken up in __switch_to().
- * The callee-saved registers must be on the stack to be read;
- * the new task will then jump to assembly support to handle
- * calling schedule_tail(), etc., and (for userspace tasks)
- * returning to the context set up in the pt_regs.
- */
- ksp = (unsigned long) childregs;
- ksp -= C_ABI_SAVE_AREA_SIZE; /* interrupt-entry save area */
- ((long *)ksp)[0] = ((long *)ksp)[1] = 0;
- ksp -= CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long);
- callee_regs = (unsigned long *)ksp;
- ksp -= C_ABI_SAVE_AREA_SIZE; /* __switch_to() save area */
- ((long *)ksp)[0] = ((long *)ksp)[1] = 0;
- p->thread.ksp = ksp;
-
- /* Record the pid of the task that created this one. */
- p->thread.creator_pid = current->pid;
-
- if (unlikely(p->flags & PF_KTHREAD)) {
- /* kernel thread */
- memset(childregs, 0, sizeof(struct pt_regs));
- memset(&callee_regs[2], 0,
- (CALLEE_SAVED_REGS_COUNT - 2) * sizeof(unsigned long));
- callee_regs[0] = sp; /* r30 = function */
- callee_regs[1] = arg; /* r31 = arg */
- p->thread.pc = (unsigned long) ret_from_kernel_thread;
- return 0;
- }
-
- /*
- * Start new thread in ret_from_fork so it schedules properly
- * and then return from interrupt like the parent.
- */
- p->thread.pc = (unsigned long) ret_from_fork;
-
- /*
- * Do not clone step state from the parent; each thread
- * must make its own lazily.
- */
- task_thread_info(p)->step_state = NULL;
-
-#ifdef __tilegx__
- /*
- * Do not clone unalign jit fixup from the parent; each thread
- * must allocate its own on demand.
- */
- task_thread_info(p)->unalign_jit_base = NULL;
-#endif
-
- /*
- * Copy the registers onto the kernel stack so the
- * return-from-interrupt code will reload it into registers.
- */
- *childregs = *current_pt_regs();
- childregs->regs[0] = 0; /* return value is zero */
- if (sp)
- childregs->sp = sp; /* override with new user stack pointer */
- memcpy(callee_regs, &childregs->regs[CALLEE_SAVED_FIRST_REG],
- CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long));
-
- /* Save user stack top pointer so we can ID the stack vm area later. */
- p->thread.usp0 = childregs->sp;
-
- /*
- * If CLONE_SETTLS is set, set "tp" in the new task to "r4",
- * which is passed in as arg #5 to sys_clone().
- */
- if (clone_flags & CLONE_SETTLS)
- childregs->tp = childregs->regs[4];
-
-
-#if CHIP_HAS_TILE_DMA()
- /*
- * No DMA in the new thread. We model this on the fact that
- * fork() clears the pending signals, alarms, and aio for the child.
- */
- memset(&p->thread.tile_dma_state, 0, sizeof(struct tile_dma_state));
- memset(&p->thread.dma_async_tlb, 0, sizeof(struct async_tlb));
-#endif
-
- /* New thread has its miscellaneous processor state bits clear. */
- p->thread.proc_status = 0;
-
-#ifdef CONFIG_HARDWALL
- /* New thread does not own any networks. */
- memset(&p->thread.hardwall[0], 0,
- sizeof(struct hardwall_task) * HARDWALL_TYPES);
-#endif
-
-
- /*
- * Start the new thread with the current architecture state
- * (user interrupt masks, etc.).
- */
- save_arch_state(&p->thread);
-
- return 0;
-}
-
-int set_unalign_ctl(struct task_struct *tsk, unsigned int val)
-{
- task_thread_info(tsk)->align_ctl = val;
- return 0;
-}
-
-int get_unalign_ctl(struct task_struct *tsk, unsigned long adr)
-{
- return put_user(task_thread_info(tsk)->align_ctl,
- (unsigned int __user *)adr);
-}
-
-static struct task_struct corrupt_current = { .comm = "<corrupt>" };
-
-/*
- * Return "current" if it looks plausible, or else a pointer to a dummy.
- * This can be helpful if we are just trying to emit a clean panic.
- */
-struct task_struct *validate_current(void)
-{
- struct task_struct *tsk = current;
- if (unlikely((unsigned long)tsk < PAGE_OFFSET ||
- (high_memory && (void *)tsk > high_memory) ||
- ((unsigned long)tsk & (__alignof__(*tsk) - 1)) != 0)) {
- pr_err("Corrupt 'current' %p (sp %#lx)\n", tsk, stack_pointer);
- tsk = &corrupt_current;
- }
- return tsk;
-}
-
-/* Take and return the pointer to the previous task, for schedule_tail(). */
-struct task_struct *sim_notify_fork(struct task_struct *prev)
-{
- struct task_struct *tsk = current;
- __insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_FORK_PARENT |
- (tsk->thread.creator_pid << _SIM_CONTROL_OPERATOR_BITS));
- __insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_FORK |
- (tsk->pid << _SIM_CONTROL_OPERATOR_BITS));
- return prev;
-}
-
-int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
-{
- struct pt_regs *ptregs = task_pt_regs(tsk);
- elf_core_copy_regs(regs, ptregs);
- return 1;
-}
-
-#if CHIP_HAS_TILE_DMA()
-
-/* Allow user processes to access the DMA SPRs */
-void grant_dma_mpls(void)
-{
-#if CONFIG_KERNEL_PL == 2
- __insn_mtspr(SPR_MPL_DMA_CPL_SET_1, 1);
- __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_1, 1);
-#else
- __insn_mtspr(SPR_MPL_DMA_CPL_SET_0, 1);
- __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_0, 1);
-#endif
-}
-
-/* Forbid user processes from accessing the DMA SPRs */
-void restrict_dma_mpls(void)
-{
-#if CONFIG_KERNEL_PL == 2
- __insn_mtspr(SPR_MPL_DMA_CPL_SET_2, 1);
- __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_2, 1);
-#else
- __insn_mtspr(SPR_MPL_DMA_CPL_SET_1, 1);
- __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_1, 1);
-#endif
-}
-
-/* Pause the DMA engine, then save off its state registers. */
-static void save_tile_dma_state(struct tile_dma_state *dma)
-{
- unsigned long state = __insn_mfspr(SPR_DMA_USER_STATUS);
- unsigned long post_suspend_state;
-
- /* If we're running, suspend the engine. */
- if ((state & DMA_STATUS_MASK) == SPR_DMA_STATUS__RUNNING_MASK)
- __insn_mtspr(SPR_DMA_CTR, SPR_DMA_CTR__SUSPEND_MASK);
-
- /*
- * Wait for the engine to idle, then save regs. Note that we
- * want to record the "running" bit from before suspension,
- * and the "done" bit from after, so that we can properly
- * distinguish a case where the user suspended the engine from
- * the case where the kernel suspended as part of the context
- * swap.
- */
- do {
- post_suspend_state = __insn_mfspr(SPR_DMA_USER_STATUS);
- } while (post_suspend_state & SPR_DMA_STATUS__BUSY_MASK);
-
- dma->src = __insn_mfspr(SPR_DMA_SRC_ADDR);
- dma->src_chunk = __insn_mfspr(SPR_DMA_SRC_CHUNK_ADDR);
- dma->dest = __insn_mfspr(SPR_DMA_DST_ADDR);
- dma->dest_chunk = __insn_mfspr(SPR_DMA_DST_CHUNK_ADDR);
- dma->strides = __insn_mfspr(SPR_DMA_STRIDE);
- dma->chunk_size = __insn_mfspr(SPR_DMA_CHUNK_SIZE);
- dma->byte = __insn_mfspr(SPR_DMA_BYTE);
- dma->status = (state & SPR_DMA_STATUS__RUNNING_MASK) |
- (post_suspend_state & SPR_DMA_STATUS__DONE_MASK);
-}
-
-/* Restart a DMA that was running before we were context-switched out. */
-static void restore_tile_dma_state(struct thread_struct *t)
-{
- const struct tile_dma_state *dma = &t->tile_dma_state;
-
- /*
- * The only way to restore the done bit is to run a zero
- * length transaction.
- */
- if ((dma->status & SPR_DMA_STATUS__DONE_MASK) &&
- !(__insn_mfspr(SPR_DMA_USER_STATUS) & SPR_DMA_STATUS__DONE_MASK)) {
- __insn_mtspr(SPR_DMA_BYTE, 0);
- __insn_mtspr(SPR_DMA_CTR, SPR_DMA_CTR__REQUEST_MASK);
- while (__insn_mfspr(SPR_DMA_USER_STATUS) &
- SPR_DMA_STATUS__BUSY_MASK)
- ;
- }
-
- __insn_mtspr(SPR_DMA_SRC_ADDR, dma->src);
- __insn_mtspr(SPR_DMA_SRC_CHUNK_ADDR, dma->src_chunk);
- __insn_mtspr(SPR_DMA_DST_ADDR, dma->dest);
- __insn_mtspr(SPR_DMA_DST_CHUNK_ADDR, dma->dest_chunk);
- __insn_mtspr(SPR_DMA_STRIDE, dma->strides);
- __insn_mtspr(SPR_DMA_CHUNK_SIZE, dma->chunk_size);
- __insn_mtspr(SPR_DMA_BYTE, dma->byte);
-
- /*
- * Restart the engine if we were running and not done.
- * Clear a pending async DMA fault that we were waiting on return
- * to user space to execute, since we expect the DMA engine
- * to regenerate those faults for us now. Note that we don't
- * try to clear the TIF_ASYNC_TLB flag, since it's relatively
- * harmless if set, and it covers both DMA and the SN processor.
- */
- if ((dma->status & DMA_STATUS_MASK) == SPR_DMA_STATUS__RUNNING_MASK) {
- t->dma_async_tlb.fault_num = 0;
- __insn_mtspr(SPR_DMA_CTR, SPR_DMA_CTR__REQUEST_MASK);
- }
-}
-
-#endif
-
-static void save_arch_state(struct thread_struct *t)
-{
-#if CHIP_HAS_SPLIT_INTR_MASK()
- t->interrupt_mask = __insn_mfspr(SPR_INTERRUPT_MASK_0_0) |
- ((u64)__insn_mfspr(SPR_INTERRUPT_MASK_0_1) << 32);
-#else
- t->interrupt_mask = __insn_mfspr(SPR_INTERRUPT_MASK_0);
-#endif
- t->ex_context[0] = __insn_mfspr(SPR_EX_CONTEXT_0_0);
- t->ex_context[1] = __insn_mfspr(SPR_EX_CONTEXT_0_1);
- t->system_save[0] = __insn_mfspr(SPR_SYSTEM_SAVE_0_0);
- t->system_save[1] = __insn_mfspr(SPR_SYSTEM_SAVE_0_1);
- t->system_save[2] = __insn_mfspr(SPR_SYSTEM_SAVE_0_2);
- t->system_save[3] = __insn_mfspr(SPR_SYSTEM_SAVE_0_3);
- t->intctrl_0 = __insn_mfspr(SPR_INTCTRL_0_STATUS);
- t->proc_status = __insn_mfspr(SPR_PROC_STATUS);
-#if !CHIP_HAS_FIXED_INTVEC_BASE()
- t->interrupt_vector_base = __insn_mfspr(SPR_INTERRUPT_VECTOR_BASE_0);
-#endif
- t->tile_rtf_hwm = __insn_mfspr(SPR_TILE_RTF_HWM);
-#if CHIP_HAS_DSTREAM_PF()
- t->dstream_pf = __insn_mfspr(SPR_DSTREAM_PF);
-#endif
-}
-
-static void restore_arch_state(const struct thread_struct *t)
-{
-#if CHIP_HAS_SPLIT_INTR_MASK()
- __insn_mtspr(SPR_INTERRUPT_MASK_0_0, (u32) t->interrupt_mask);
- __insn_mtspr(SPR_INTERRUPT_MASK_0_1, t->interrupt_mask >> 32);
-#else
- __insn_mtspr(SPR_INTERRUPT_MASK_0, t->interrupt_mask);
-#endif
- __insn_mtspr(SPR_EX_CONTEXT_0_0, t->ex_context[0]);
- __insn_mtspr(SPR_EX_CONTEXT_0_1, t->ex_context[1]);
- __insn_mtspr(SPR_SYSTEM_SAVE_0_0, t->system_save[0]);
- __insn_mtspr(SPR_SYSTEM_SAVE_0_1, t->system_save[1]);
- __insn_mtspr(SPR_SYSTEM_SAVE_0_2, t->system_save[2]);
- __insn_mtspr(SPR_SYSTEM_SAVE_0_3, t->system_save[3]);
- __insn_mtspr(SPR_INTCTRL_0_STATUS, t->intctrl_0);
- __insn_mtspr(SPR_PROC_STATUS, t->proc_status);
-#if !CHIP_HAS_FIXED_INTVEC_BASE()
- __insn_mtspr(SPR_INTERRUPT_VECTOR_BASE_0, t->interrupt_vector_base);
-#endif
- __insn_mtspr(SPR_TILE_RTF_HWM, t->tile_rtf_hwm);
-#if CHIP_HAS_DSTREAM_PF()
- __insn_mtspr(SPR_DSTREAM_PF, t->dstream_pf);
-#endif
-}
-
-
-void _prepare_arch_switch(struct task_struct *next)
-{
-#if CHIP_HAS_TILE_DMA()
- struct tile_dma_state *dma = &current->thread.tile_dma_state;
- if (dma->enabled)
- save_tile_dma_state(dma);
-#endif
-}
-
-
-struct task_struct *__sched _switch_to(struct task_struct *prev,
- struct task_struct *next)
-{
- /* DMA state is already saved; save off other arch state. */
- save_arch_state(&prev->thread);
-
-#if CHIP_HAS_TILE_DMA()
- /*
- * Restore DMA in new task if desired.
- * Note that it is only safe to restart here since interrupts
- * are disabled, so we can't take any DMATLB miss or access
- * interrupts before we have finished switching stacks.
- */
- if (next->thread.tile_dma_state.enabled) {
- restore_tile_dma_state(&next->thread);
- grant_dma_mpls();
- } else {
- restrict_dma_mpls();
- }
-#endif
-
- /* Restore other arch state. */
- restore_arch_state(&next->thread);
-
-#ifdef CONFIG_HARDWALL
- /* Enable or disable access to the network registers appropriately. */
- hardwall_switch_tasks(prev, next);
-#endif
-
- /* Notify the simulator of task exit. */
- if (unlikely(prev->state == TASK_DEAD))
- __insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_EXIT |
- (prev->pid << _SIM_CONTROL_OPERATOR_BITS));
-
- /*
- * Switch kernel SP, PC, and callee-saved registers.
- * In the context of the new task, return the old task pointer
- * (i.e. the task that actually called __switch_to).
- * Pass the value to use for SYSTEM_SAVE_K_0 when we reset our sp.
- */
- return __switch_to(prev, next, next_current_ksp0(next));
-}
-
-/*
- * This routine is called on return from interrupt if any of the
- * TIF_ALLWORK_MASK flags are set in thread_info->flags. It is
- * entered with interrupts disabled so we don't miss an event that
- * modified the thread_info flags. We loop until all the tested flags
- * are clear. Note that the function is called on certain conditions
- * that are not listed in the loop condition here (e.g. SINGLESTEP)
- * which guarantees we will do those things once, and redo them if any
- * of the other work items is re-done, but won't continue looping if
- * all the other work is done.
- */
-void prepare_exit_to_usermode(struct pt_regs *regs, u32 thread_info_flags)
-{
- if (WARN_ON(!user_mode(regs)))
- return;
-
- do {
- local_irq_enable();
-
- if (thread_info_flags & _TIF_NEED_RESCHED)
- schedule();
-
-#if CHIP_HAS_TILE_DMA()
- if (thread_info_flags & _TIF_ASYNC_TLB)
- do_async_page_fault(regs);
-#endif
-
- if (thread_info_flags & _TIF_SIGPENDING)
- do_signal(regs);
-
- if (thread_info_flags & _TIF_NOTIFY_RESUME) {
- clear_thread_flag(TIF_NOTIFY_RESUME);
- tracehook_notify_resume(regs);
- }
-
- local_irq_disable();
- thread_info_flags = READ_ONCE(current_thread_info()->flags);
-
- } while (thread_info_flags & _TIF_WORK_MASK);
-
- if (thread_info_flags & _TIF_SINGLESTEP) {
- single_step_once(regs);
-#ifndef __tilegx__
- /*
- * FIXME: on tilepro, since we enable interrupts in
- * this routine, it's possible that we miss a signal
- * or other asynchronous event.
- */
- local_irq_disable();
-#endif
- }
-
- user_enter();
-}
-
-unsigned long get_wchan(struct task_struct *p)
-{
- struct KBacktraceIterator kbt;
-
- if (!p || p == current || p->state == TASK_RUNNING)
- return 0;
-
- for (KBacktraceIterator_init(&kbt, p, NULL);
- !KBacktraceIterator_end(&kbt);
- KBacktraceIterator_next(&kbt)) {
- if (!in_sched_functions(kbt.it.pc))
- return kbt.it.pc;
- }
-
- return 0;
-}
-
-/* Flush thread state. */
-void flush_thread(void)
-{
- /* Nothing */
-}
-
-/*
- * Free current thread data structures etc..
- */
-void exit_thread(struct task_struct *tsk)
-{
-#ifdef CONFIG_HARDWALL
- /*
- * Remove the task from the list of tasks that are associated
- * with any live hardwalls. (If the task that is exiting held
- * the last reference to a hardwall fd, it would already have
- * been released and deactivated at this point.)
- */
- hardwall_deactivate_all(tsk);
-#endif
-}
-
-void tile_show_regs(struct pt_regs *regs)
-{
- int i;
-#ifdef __tilegx__
- for (i = 0; i < 17; i++)
- pr_err(" r%-2d: "REGFMT" r%-2d: "REGFMT" r%-2d: "REGFMT"\n",
- i, regs->regs[i], i+18, regs->regs[i+18],
- i+36, regs->regs[i+36]);
- pr_err(" r17: "REGFMT" r35: "REGFMT" tp : "REGFMT"\n",
- regs->regs[17], regs->regs[35], regs->tp);
- pr_err(" sp : "REGFMT" lr : "REGFMT"\n", regs->sp, regs->lr);
-#else
- for (i = 0; i < 13; i++)
- pr_err(" r%-2d: "REGFMT" r%-2d: "REGFMT
- " r%-2d: "REGFMT" r%-2d: "REGFMT"\n",
- i, regs->regs[i], i+14, regs->regs[i+14],
- i+27, regs->regs[i+27], i+40, regs->regs[i+40]);
- pr_err(" r13: "REGFMT" tp : "REGFMT" sp : "REGFMT" lr : "REGFMT"\n",
- regs->regs[13], regs->tp, regs->sp, regs->lr);
-#endif
- pr_err(" pc : "REGFMT" ex1: %ld faultnum: %ld flags:%s%s%s%s\n",
- regs->pc, regs->ex1, regs->faultnum,
- is_compat_task() ? " compat" : "",
- (regs->flags & PT_FLAGS_DISABLE_IRQ) ? " noirq" : "",
- !(regs->flags & PT_FLAGS_CALLER_SAVES) ? " nocallersave" : "",
- (regs->flags & PT_FLAGS_RESTORE_REGS) ? " restoreregs" : "");
-}
-
-void show_regs(struct pt_regs *regs)
-{
- struct KBacktraceIterator kbt;
-
- show_regs_print_info(KERN_DEFAULT);
- tile_show_regs(regs);
-
- KBacktraceIterator_init(&kbt, NULL, regs);
- tile_show_stack(&kbt);
-}
-
-#ifdef __tilegx__
-void nmi_raise_cpu_backtrace(struct cpumask *in_mask)
-{
- struct cpumask mask;
- HV_Coord tile;
- unsigned int timeout;
- int cpu;
- HV_NMI_Info info[NR_CPUS];
-
- /* Tentatively dump stack on remote tiles via NMI. */
- timeout = 100;
- cpumask_copy(&mask, in_mask);
- while (!cpumask_empty(&mask) && timeout) {
- for_each_cpu(cpu, &mask) {
- tile.x = cpu_x(cpu);
- tile.y = cpu_y(cpu);
- info[cpu] = hv_send_nmi(tile, TILE_NMI_DUMP_STACK, 0);
- if (info[cpu].result == HV_NMI_RESULT_OK)
- cpumask_clear_cpu(cpu, &mask);
- }
-
- mdelay(10);
- touch_softlockup_watchdog();
- timeout--;
- }
-
- /* Warn about cpus stuck in ICS. */
- if (!cpumask_empty(&mask)) {
- for_each_cpu(cpu, &mask) {
-
- /* Clear the bit as if nmi_cpu_backtrace() ran. */
- cpumask_clear_cpu(cpu, in_mask);
-
- switch (info[cpu].result) {
- case HV_NMI_RESULT_FAIL_ICS:
- pr_warn("Skipping stack dump of cpu %d in ICS at pc %#llx\n",
- cpu, info[cpu].pc);
- break;
- case HV_NMI_RESULT_FAIL_HV:
- pr_warn("Skipping stack dump of cpu %d in hypervisor\n",
- cpu);
- break;
- case HV_ENOSYS:
- WARN_ONCE(1, "Hypervisor too old to allow remote stack dumps.\n");
- break;
- default: /* should not happen */
- pr_warn("Skipping stack dump of cpu %d [%d,%#llx]\n",
- cpu, info[cpu].result, info[cpu].pc);
- break;
- }
- }
- }
-}
-
-void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
-{
- nmi_trigger_cpumask_backtrace(mask, exclude_self,
- nmi_raise_cpu_backtrace);
-}
-#endif /* __tilegx_ */