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 <james.hogan@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/10072/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
parent
37dd3818d1
commit
d1e9a4f547
|
@ -77,6 +77,7 @@ obj-$(CONFIG_MIPS32_O32) += binfmt_elfo32.o scall64-o32.o
|
|||
|
||||
obj-$(CONFIG_KGDB) += kgdb.o
|
||||
obj-$(CONFIG_PROC_FS) += proc.o
|
||||
obj-$(CONFIG_MAGIC_SYSRQ) += sysrq.o
|
||||
|
||||
obj-$(CONFIG_64BIT) += cpu-bugs64.o
|
||||
|
||||
|
|
77
arch/mips/kernel/sysrq.c
Normal file
77
arch/mips/kernel/sysrq.c
Normal file
|
@ -0,0 +1,77 @@
|
|||
/*
|
||||
* 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>
|
||||
|
||||
#include <asm/cpu-features.h>
|
||||
#include <asm/mipsregs.h>
|
||||
#include <asm/tlbdebug.h>
|
||||
|
||||
/*
|
||||
* Dump TLB entries on all CPUs.
|
||||
*/
|
||||
|
||||
static DEFINE_SPINLOCK(show_lock);
|
||||
|
||||
static void sysrq_tlbdump_single(void *dummy)
|
||||
{
|
||||
const int field = 2 * sizeof(unsigned long);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&show_lock, flags);
|
||||
|
||||
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");
|
||||
|
||||
spin_unlock_irqrestore(&show_lock, flags);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
static void sysrq_tlbdump_othercpus(struct work_struct *dummy)
|
||||
{
|
||||
smp_call_function(sysrq_tlbdump_single, NULL, 0);
|
||||
}
|
||||
|
||||
static DECLARE_WORK(sysrq_tlbdump, sysrq_tlbdump_othercpus);
|
||||
#endif
|
||||
|
||||
static void sysrq_handle_tlbdump(int key)
|
||||
{
|
||||
sysrq_tlbdump_single(NULL);
|
||||
#ifdef CONFIG_SMP
|
||||
schedule_work(&sysrq_tlbdump);
|
||||
#endif
|
||||
}
|
||||
|
||||
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,
|
||||
};
|
||||
|
||||
static int __init mips_sysrq_init(void)
|
||||
{
|
||||
return register_sysrq_key('x', &sysrq_tlbdump_op);
|
||||
}
|
||||
arch_initcall(mips_sysrq_init);
|
|
@ -463,6 +463,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
|
|||
/* v: May be registered for frame buffer console restore */
|
||||
NULL, /* v */
|
||||
&sysrq_showstate_blocked_op, /* w */
|
||||
/* x: May be registered on mips for TLB dump */
|
||||
/* x: May be registered on ppc/powerpc for xmon */
|
||||
/* x: May be registered on sparc64 for global PMU dump */
|
||||
NULL, /* x */
|
||||
|
|
Loading…
Reference in a new issue