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d1e9a4f5 JH |
1 | /* |
2 | * MIPS specific sysrq operations. | |
3 | * | |
4 | * Copyright (C) 2015 Imagination Technologies Ltd. | |
5 | */ | |
6 | #include <linux/init.h> | |
7 | #include <linux/smp.h> | |
8 | #include <linux/spinlock.h> | |
9 | #include <linux/sysrq.h> | |
10 | #include <linux/workqueue.h> | |
11 | ||
12 | #include <asm/cpu-features.h> | |
13 | #include <asm/mipsregs.h> | |
14 | #include <asm/tlbdebug.h> | |
15 | ||
16 | /* | |
17 | * Dump TLB entries on all CPUs. | |
18 | */ | |
19 | ||
20 | static DEFINE_SPINLOCK(show_lock); | |
21 | ||
22 | static void sysrq_tlbdump_single(void *dummy) | |
23 | { | |
d1e9a4f5 JH |
24 | unsigned long flags; |
25 | ||
26 | spin_lock_irqsave(&show_lock, flags); | |
27 | ||
28 | pr_info("CPU%d:\n", smp_processor_id()); | |
3c865dd9 | 29 | dump_tlb_regs(); |
d1e9a4f5 JH |
30 | pr_info("\n"); |
31 | dump_tlb_all(); | |
32 | pr_info("\n"); | |
33 | ||
34 | spin_unlock_irqrestore(&show_lock, flags); | |
35 | } | |
36 | ||
37 | #ifdef CONFIG_SMP | |
38 | static void sysrq_tlbdump_othercpus(struct work_struct *dummy) | |
39 | { | |
40 | smp_call_function(sysrq_tlbdump_single, NULL, 0); | |
41 | } | |
42 | ||
43 | static DECLARE_WORK(sysrq_tlbdump, sysrq_tlbdump_othercpus); | |
44 | #endif | |
45 | ||
46 | static void sysrq_handle_tlbdump(int key) | |
47 | { | |
48 | sysrq_tlbdump_single(NULL); | |
49 | #ifdef CONFIG_SMP | |
50 | schedule_work(&sysrq_tlbdump); | |
51 | #endif | |
52 | } | |
53 | ||
54 | static struct sysrq_key_op sysrq_tlbdump_op = { | |
55 | .handler = sysrq_handle_tlbdump, | |
56 | .help_msg = "show-tlbs(x)", | |
57 | .action_msg = "Show TLB entries", | |
58 | .enable_mask = SYSRQ_ENABLE_DUMP, | |
59 | }; | |
60 | ||
61 | static int __init mips_sysrq_init(void) | |
62 | { | |
63 | return register_sysrq_key('x', &sysrq_tlbdump_op); | |
64 | } | |
65 | arch_initcall(mips_sysrq_init); |