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
sysrq_tlbdump_single(void * dummy)22 static void sysrq_tlbdump_single(void *dummy)
23 {
24 const int field = 2 * sizeof(unsigned long);
25 unsigned long flags;
26
27 spin_lock_irqsave(&show_lock, flags);
28
29 pr_info("CPU%d:\n", smp_processor_id());
30 pr_info("Index : %0x\n", read_c0_index());
31 pr_info("Pagemask: %0x\n", read_c0_pagemask());
32 pr_info("EntryHi : %0*lx\n", field, read_c0_entryhi());
33 pr_info("EntryLo0: %0*lx\n", field, read_c0_entrylo0());
34 pr_info("EntryLo1: %0*lx\n", field, read_c0_entrylo1());
35 pr_info("Wired : %0x\n", read_c0_wired());
36 pr_info("Pagegrain: %0x\n", read_c0_pagegrain());
37 if (cpu_has_htw) {
38 pr_info("PWField : %0*lx\n", field, read_c0_pwfield());
39 pr_info("PWSize : %0*lx\n", field, read_c0_pwsize());
40 pr_info("PWCtl : %0x\n", read_c0_pwctl());
41 }
42 pr_info("\n");
43 dump_tlb_all();
44 pr_info("\n");
45
46 spin_unlock_irqrestore(&show_lock, flags);
47 }
48
49 #ifdef CONFIG_SMP
sysrq_tlbdump_othercpus(struct work_struct * dummy)50 static void sysrq_tlbdump_othercpus(struct work_struct *dummy)
51 {
52 smp_call_function(sysrq_tlbdump_single, NULL, 0);
53 }
54
55 static DECLARE_WORK(sysrq_tlbdump, sysrq_tlbdump_othercpus);
56 #endif
57
sysrq_handle_tlbdump(int key)58 static void sysrq_handle_tlbdump(int key)
59 {
60 sysrq_tlbdump_single(NULL);
61 #ifdef CONFIG_SMP
62 schedule_work(&sysrq_tlbdump);
63 #endif
64 }
65
66 static struct sysrq_key_op sysrq_tlbdump_op = {
67 .handler = sysrq_handle_tlbdump,
68 .help_msg = "show-tlbs(x)",
69 .action_msg = "Show TLB entries",
70 .enable_mask = SYSRQ_ENABLE_DUMP,
71 };
72
mips_sysrq_init(void)73 static int __init mips_sysrq_init(void)
74 {
75 return register_sysrq_key('x', &sysrq_tlbdump_op);
76 }
77 arch_initcall(mips_sysrq_init);
78