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Commit d1e9a4f5 authored by James Hogan's avatar James Hogan Committed by Ralf Baechle
Browse files

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: default avatarJames Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10072/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 37dd3818

arch/mips/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/mips/kernel/sysrq.c

0 → 100644
+77 −0
Original line number Diff line number Diff line 
/*

 * 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);

drivers/tty/sysrq.c

+1 −0
Original line number Diff line number Diff line
@@ -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 */