Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 1 | /* |
| 2 | * arch/x86/kernel/nmi-selftest.c |
| 3 | * |
| 4 | * Testsuite for NMI: IPIs |
| 5 | * |
| 6 | * Started by Don Zickus: |
| 7 | * (using lib/locking-selftest.c as a guide) |
| 8 | * |
| 9 | * Copyright (C) 2011 Red Hat, Inc., Don Zickus <dzickus@redhat.com> |
| 10 | */ |
| 11 | |
| 12 | #include <linux/smp.h> |
| 13 | #include <linux/cpumask.h> |
| 14 | #include <linux/delay.h> |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 15 | #include <linux/init.h> |
Alex Shi | c6ae41e | 2012-05-11 15:35:27 +0800 | [diff] [blame] | 16 | #include <linux/percpu.h> |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 17 | |
| 18 | #include <asm/apic.h> |
| 19 | #include <asm/nmi.h> |
| 20 | |
| 21 | #define SUCCESS 0 |
| 22 | #define FAILURE 1 |
| 23 | #define TIMEOUT 2 |
| 24 | |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 25 | static int __initdata nmi_fail; |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 26 | |
| 27 | /* check to see if NMI IPIs work on this machine */ |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 28 | static DECLARE_BITMAP(nmi_ipi_mask, NR_CPUS) __initdata; |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 29 | |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 30 | static int __initdata testcase_total; |
| 31 | static int __initdata testcase_successes; |
| 32 | static int __initdata expected_testcase_failures; |
| 33 | static int __initdata unexpected_testcase_failures; |
| 34 | static int __initdata unexpected_testcase_unknowns; |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 35 | |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 36 | static int __init nmi_unk_cb(unsigned int val, struct pt_regs *regs) |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 37 | { |
| 38 | unexpected_testcase_unknowns++; |
| 39 | return NMI_HANDLED; |
| 40 | } |
| 41 | |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 42 | static void __init init_nmi_testsuite(void) |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 43 | { |
| 44 | /* trap all the unknown NMIs we may generate */ |
Li Zhong | 0718467 | 2012-06-18 15:56:33 -0400 | [diff] [blame] | 45 | register_nmi_handler(NMI_UNKNOWN, nmi_unk_cb, 0, "nmi_selftest_unk", |
| 46 | __initdata); |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 47 | } |
| 48 | |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 49 | static void __init cleanup_nmi_testsuite(void) |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 50 | { |
| 51 | unregister_nmi_handler(NMI_UNKNOWN, "nmi_selftest_unk"); |
| 52 | } |
| 53 | |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 54 | static int __init test_nmi_ipi_callback(unsigned int val, struct pt_regs *regs) |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 55 | { |
| 56 | int cpu = raw_smp_processor_id(); |
| 57 | |
| 58 | if (cpumask_test_and_clear_cpu(cpu, to_cpumask(nmi_ipi_mask))) |
| 59 | return NMI_HANDLED; |
| 60 | |
| 61 | return NMI_DONE; |
| 62 | } |
| 63 | |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 64 | static void __init test_nmi_ipi(struct cpumask *mask) |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 65 | { |
| 66 | unsigned long timeout; |
| 67 | |
Li Zhong | 0718467 | 2012-06-18 15:56:33 -0400 | [diff] [blame] | 68 | if (register_nmi_handler(NMI_LOCAL, test_nmi_ipi_callback, |
| 69 | NMI_FLAG_FIRST, "nmi_selftest", __initdata)) { |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 70 | nmi_fail = FAILURE; |
| 71 | return; |
| 72 | } |
| 73 | |
| 74 | /* sync above data before sending NMI */ |
| 75 | wmb(); |
| 76 | |
| 77 | apic->send_IPI_mask(mask, NMI_VECTOR); |
| 78 | |
| 79 | /* Don't wait longer than a second */ |
| 80 | timeout = USEC_PER_SEC; |
| 81 | while (!cpumask_empty(mask) && timeout--) |
| 82 | udelay(1); |
| 83 | |
| 84 | /* What happens if we timeout, do we still unregister?? */ |
| 85 | unregister_nmi_handler(NMI_LOCAL, "nmi_selftest"); |
| 86 | |
| 87 | if (!timeout) |
| 88 | nmi_fail = TIMEOUT; |
| 89 | return; |
| 90 | } |
| 91 | |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 92 | static void __init remote_ipi(void) |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 93 | { |
| 94 | cpumask_copy(to_cpumask(nmi_ipi_mask), cpu_online_mask); |
| 95 | cpumask_clear_cpu(smp_processor_id(), to_cpumask(nmi_ipi_mask)); |
Dan Carpenter | 3d6240b | 2011-12-07 14:06:12 +0300 | [diff] [blame] | 96 | if (!cpumask_empty(to_cpumask(nmi_ipi_mask))) |
Don Zickus | 565cbc3 | 2011-12-06 13:08:59 -0500 | [diff] [blame] | 97 | test_nmi_ipi(to_cpumask(nmi_ipi_mask)); |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 98 | } |
| 99 | |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 100 | static void __init local_ipi(void) |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 101 | { |
| 102 | cpumask_clear(to_cpumask(nmi_ipi_mask)); |
| 103 | cpumask_set_cpu(smp_processor_id(), to_cpumask(nmi_ipi_mask)); |
| 104 | test_nmi_ipi(to_cpumask(nmi_ipi_mask)); |
| 105 | } |
| 106 | |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 107 | static void __init reset_nmi(void) |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 108 | { |
| 109 | nmi_fail = 0; |
| 110 | } |
| 111 | |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 112 | static void __init dotest(void (*testcase_fn)(void), int expected) |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 113 | { |
| 114 | testcase_fn(); |
| 115 | /* |
| 116 | * Filter out expected failures: |
| 117 | */ |
| 118 | if (nmi_fail != expected) { |
| 119 | unexpected_testcase_failures++; |
| 120 | |
| 121 | if (nmi_fail == FAILURE) |
Sasha Levin | 29d679f | 2012-05-08 17:56:12 +0200 | [diff] [blame] | 122 | printk(KERN_CONT "FAILED |"); |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 123 | else if (nmi_fail == TIMEOUT) |
Sasha Levin | 29d679f | 2012-05-08 17:56:12 +0200 | [diff] [blame] | 124 | printk(KERN_CONT "TIMEOUT|"); |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 125 | else |
Sasha Levin | 29d679f | 2012-05-08 17:56:12 +0200 | [diff] [blame] | 126 | printk(KERN_CONT "ERROR |"); |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 127 | dump_stack(); |
| 128 | } else { |
| 129 | testcase_successes++; |
Sasha Levin | 29d679f | 2012-05-08 17:56:12 +0200 | [diff] [blame] | 130 | printk(KERN_CONT " ok |"); |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 131 | } |
| 132 | testcase_total++; |
| 133 | |
| 134 | reset_nmi(); |
| 135 | } |
| 136 | |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 137 | static inline void __init print_testname(const char *testname) |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 138 | { |
| 139 | printk("%12s:", testname); |
| 140 | } |
| 141 | |
Jan Beulich | f0ba662 | 2012-02-24 12:09:21 +0000 | [diff] [blame] | 142 | void __init nmi_selftest(void) |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 143 | { |
| 144 | init_nmi_testsuite(); |
| 145 | |
| 146 | /* |
| 147 | * Run the testsuite: |
| 148 | */ |
| 149 | printk("----------------\n"); |
| 150 | printk("| NMI testsuite:\n"); |
| 151 | printk("--------------------\n"); |
| 152 | |
| 153 | print_testname("remote IPI"); |
| 154 | dotest(remote_ipi, SUCCESS); |
Sasha Levin | 29d679f | 2012-05-08 17:56:12 +0200 | [diff] [blame] | 155 | printk(KERN_CONT "\n"); |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 156 | print_testname("local IPI"); |
| 157 | dotest(local_ipi, SUCCESS); |
Sasha Levin | 29d679f | 2012-05-08 17:56:12 +0200 | [diff] [blame] | 158 | printk(KERN_CONT "\n"); |
Don Zickus | 99e8b9c | 2011-10-13 15:14:26 -0400 | [diff] [blame] | 159 | |
| 160 | cleanup_nmi_testsuite(); |
| 161 | |
| 162 | if (unexpected_testcase_failures) { |
| 163 | printk("--------------------\n"); |
| 164 | printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n", |
| 165 | unexpected_testcase_failures, testcase_total); |
| 166 | printk("-----------------------------------------------------------------\n"); |
| 167 | } else if (expected_testcase_failures && testcase_successes) { |
| 168 | printk("--------------------\n"); |
| 169 | printk("%3d out of %3d testcases failed, as expected. |\n", |
| 170 | expected_testcase_failures, testcase_total); |
| 171 | printk("----------------------------------------------------\n"); |
| 172 | } else if (expected_testcase_failures && !testcase_successes) { |
| 173 | printk("--------------------\n"); |
| 174 | printk("All %3d testcases failed, as expected. |\n", |
| 175 | expected_testcase_failures); |
| 176 | printk("----------------------------------------\n"); |
| 177 | } else { |
| 178 | printk("--------------------\n"); |
| 179 | printk("Good, all %3d testcases passed! |\n", |
| 180 | testcase_successes); |
| 181 | printk("---------------------------------\n"); |
| 182 | } |
| 183 | } |