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MIPS: Add SysRq operation to dump TLBs on all CPUs
Add a MIPS specific SysRq operation to dump the TLB entries on all CPUs, using the 'x' trigger key. Signed-off-by: James Hogan <[email protected]> Cc: [email protected] Patchwork: https://patchwork.linux-mips.org/patch/10072/ Signed-off-by: Ralf Baechle <[email protected]>
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/* | ||
* MIPS specific sysrq operations. | ||
* | ||
* Copyright (C) 2015 Imagination Technologies Ltd. | ||
*/ | ||
#include <linux/init.h> | ||
#include <linux/smp.h> | ||
#include <linux/spinlock.h> | ||
#include <linux/sysrq.h> | ||
#include <linux/workqueue.h> | ||
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#include <asm/cpu-features.h> | ||
#include <asm/mipsregs.h> | ||
#include <asm/tlbdebug.h> | ||
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/* | ||
* Dump TLB entries on all CPUs. | ||
*/ | ||
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static DEFINE_SPINLOCK(show_lock); | ||
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static void sysrq_tlbdump_single(void *dummy) | ||
{ | ||
const int field = 2 * sizeof(unsigned long); | ||
unsigned long flags; | ||
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spin_lock_irqsave(&show_lock, flags); | ||
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pr_info("CPU%d:\n", smp_processor_id()); | ||
pr_info("Index : %0x\n", read_c0_index()); | ||
pr_info("Pagemask: %0x\n", read_c0_pagemask()); | ||
pr_info("EntryHi : %0*lx\n", field, read_c0_entryhi()); | ||
pr_info("EntryLo0: %0*lx\n", field, read_c0_entrylo0()); | ||
pr_info("EntryLo1: %0*lx\n", field, read_c0_entrylo1()); | ||
pr_info("Wired : %0x\n", read_c0_wired()); | ||
pr_info("Pagegrain: %0x\n", read_c0_pagegrain()); | ||
if (cpu_has_htw) { | ||
pr_info("PWField : %0*lx\n", field, read_c0_pwfield()); | ||
pr_info("PWSize : %0*lx\n", field, read_c0_pwsize()); | ||
pr_info("PWCtl : %0x\n", read_c0_pwctl()); | ||
} | ||
pr_info("\n"); | ||
dump_tlb_all(); | ||
pr_info("\n"); | ||
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spin_unlock_irqrestore(&show_lock, flags); | ||
} | ||
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#ifdef CONFIG_SMP | ||
static void sysrq_tlbdump_othercpus(struct work_struct *dummy) | ||
{ | ||
smp_call_function(sysrq_tlbdump_single, NULL, 0); | ||
} | ||
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static DECLARE_WORK(sysrq_tlbdump, sysrq_tlbdump_othercpus); | ||
#endif | ||
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static void sysrq_handle_tlbdump(int key) | ||
{ | ||
sysrq_tlbdump_single(NULL); | ||
#ifdef CONFIG_SMP | ||
schedule_work(&sysrq_tlbdump); | ||
#endif | ||
} | ||
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static struct sysrq_key_op sysrq_tlbdump_op = { | ||
.handler = sysrq_handle_tlbdump, | ||
.help_msg = "show-tlbs(x)", | ||
.action_msg = "Show TLB entries", | ||
.enable_mask = SYSRQ_ENABLE_DUMP, | ||
}; | ||
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static int __init mips_sysrq_init(void) | ||
{ | ||
return register_sysrq_key('x', &sysrq_tlbdump_op); | ||
} | ||
arch_initcall(mips_sysrq_init); |
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