linux/arch/mips/kernel/sysrq.c
James Hogan 3c865dd9c1 MIPS: Refactor dumping of TLB registers for r3k/r4k
The TLB registers are dumped in a couble of places:
 - sysrq_tlbdump_single() - when dumping TLB state.
 - do_mcheck() - in response to a machine check error.

The main TLB registers also differ between r3k and r4k, but r4k appears
to be assumed.

Refactor this code into a dump_tlb_regs() function, implemented for both
r3k and r4k, and used by both of the above functions.

Fixes: d1e9a4f547 ("MIPS: Add SysRq operation to dump TLBs on all CPUs")
Suggested-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10721/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-09-03 12:07:45 +02:00

66 lines
1.3 KiB
C

/*
* 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)
{
unsigned long flags;
spin_lock_irqsave(&show_lock, flags);
pr_info("CPU%d:\n", smp_processor_id());
dump_tlb_regs();
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);