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LoongArch: Add SysRq-x (TLB Dump) support

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Add SysRq-x (TLB Dump) support for LoongArch, which is useful for
debugging.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2022-10-12 16:36:14 +08:00
parent b37042b2bb
commit dea2df3cc7
2 changed files with 67 additions and 0 deletions
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2
arch/loongarch/kernel/Makefile
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@ -23,6 +23,8 @@ obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_NUMA) += numa.o
obj-$(CONFIG_MAGIC_SYSRQ) += sysrq.o
obj-$(CONFIG_UNWINDER_GUESS) += unwind_guess.o
obj-$(CONFIG_UNWINDER_PROLOGUE) += unwind_prologue.o

65
arch/loongarch/kernel/sysrq.c Normal file
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@ -0,0 +1,65 @@
// SPDX-License-Identifier: GPL-2.0
/*
* LoongArch specific sysrq operations.
*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#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/tlb.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 loongarch_sysrq_init(void)
{
return register_sysrq_key('x', &sysrq_tlbdump_op);
}
arch_initcall(loongarch_sysrq_init);