1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * MIPS specific sysrq operations. |
4 | * |
5 | * Copyright (C) 2015 Imagination Technologies Ltd. |
6 | */ |
7 | #include <linux/init.h> |
8 | #include <linux/smp.h> |
9 | #include <linux/spinlock.h> |
10 | #include <linux/sysrq.h> |
11 | #include <linux/workqueue.h> |
12 | |
13 | #include <asm/cpu-features.h> |
14 | #include <asm/mipsregs.h> |
15 | #include <asm/tlbdebug.h> |
16 | |
17 | /* |
18 | * Dump TLB entries on all CPUs. |
19 | */ |
20 | |
21 | static DEFINE_SPINLOCK(show_lock); |
22 | |
23 | static void sysrq_tlbdump_single(void *dummy) |
24 | { |
25 | unsigned long flags; |
26 | |
27 | spin_lock_irqsave(&show_lock, flags); |
28 | |
29 | pr_info("CPU%d:\n" , smp_processor_id()); |
30 | dump_tlb_regs(); |
31 | pr_info("\n" ); |
32 | dump_tlb_all(); |
33 | pr_info("\n" ); |
34 | |
35 | spin_unlock_irqrestore(lock: &show_lock, flags); |
36 | } |
37 | |
38 | #ifdef CONFIG_SMP |
39 | static void sysrq_tlbdump_othercpus(struct work_struct *dummy) |
40 | { |
41 | smp_call_function(func: sysrq_tlbdump_single, NULL, wait: 0); |
42 | } |
43 | |
44 | static DECLARE_WORK(sysrq_tlbdump, sysrq_tlbdump_othercpus); |
45 | #endif |
46 | |
47 | static void sysrq_handle_tlbdump(u8 key) |
48 | { |
49 | sysrq_tlbdump_single(NULL); |
50 | #ifdef CONFIG_SMP |
51 | schedule_work(work: &sysrq_tlbdump); |
52 | #endif |
53 | } |
54 | |
55 | static const struct sysrq_key_op sysrq_tlbdump_op = { |
56 | .handler = sysrq_handle_tlbdump, |
57 | .help_msg = "show-tlbs(x)" , |
58 | .action_msg = "Show TLB entries" , |
59 | .enable_mask = SYSRQ_ENABLE_DUMP, |
60 | }; |
61 | |
62 | static int __init mips_sysrq_init(void) |
63 | { |
64 | return register_sysrq_key(key: 'x', op: &sysrq_tlbdump_op); |
65 | } |
66 | arch_initcall(mips_sysrq_init); |
67 | |