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