1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * LoongArch specific sysrq operations. |
4 | * |
5 | * Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
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/tlb.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 | { |
24 | unsigned long flags; |
25 | |
26 | spin_lock_irqsave(&show_lock, flags); |
27 | |
28 | pr_info("CPU%d:\n" , smp_processor_id()); |
29 | dump_tlb_regs(); |
30 | pr_info("\n" ); |
31 | dump_tlb_all(); |
32 | pr_info("\n" ); |
33 | |
34 | spin_unlock_irqrestore(lock: &show_lock, flags); |
35 | } |
36 | |
37 | #ifdef CONFIG_SMP |
38 | static void sysrq_tlbdump_othercpus(struct work_struct *dummy) |
39 | { |
40 | smp_call_function(func: sysrq_tlbdump_single, NULL, wait: 0); |
41 | } |
42 | |
43 | static DECLARE_WORK(sysrq_tlbdump, sysrq_tlbdump_othercpus); |
44 | #endif |
45 | |
46 | static void sysrq_handle_tlbdump(u8 key) |
47 | { |
48 | sysrq_tlbdump_single(NULL); |
49 | #ifdef CONFIG_SMP |
50 | schedule_work(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 loongarch_sysrq_init(void) |
62 | { |
63 | return register_sysrq_key(key: 'x', op: &sysrq_tlbdump_op); |
64 | } |
65 | arch_initcall(loongarch_sysrq_init); |
66 | |