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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>
15#include <linux/init.h>
16#include <linux/percpu.h>
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
25static int __initdata nmi_fail;
26
27/* check to see if NMI IPIs work on this machine */
28static DECLARE_BITMAP(nmi_ipi_mask, NR_CPUS) __initdata;
29
30static int __initdata testcase_total;
31static int __initdata testcase_successes;
32static int __initdata expected_testcase_failures;
33static int __initdata unexpected_testcase_failures;
34static int __initdata unexpected_testcase_unknowns;
35
36static int __init nmi_unk_cb(unsigned int val, struct pt_regs *regs)
37{
38 unexpected_testcase_unknowns++;
39 return NMI_HANDLED;
40}
41
42static void __init init_nmi_testsuite(void)
43{
44 /* trap all the unknown NMIs we may generate */
45 register_nmi_handler_initonly(NMI_UNKNOWN, nmi_unk_cb, 0, "nmi_selftest_unk");
46}
47
48static void __init cleanup_nmi_testsuite(void)
49{
50 unregister_nmi_handler(NMI_UNKNOWN, "nmi_selftest_unk");
51}
52
53static int __init test_nmi_ipi_callback(unsigned int val, struct pt_regs *regs)
54{
55 int cpu = raw_smp_processor_id();
56
57 if (cpumask_test_and_clear_cpu(cpu, to_cpumask(nmi_ipi_mask)))
58 return NMI_HANDLED;
59
60 return NMI_DONE;
61}
62
63static void __init test_nmi_ipi(struct cpumask *mask)
64{
65 unsigned long timeout;
66
67 if (register_nmi_handler_initonly(NMI_LOCAL, test_nmi_ipi_callback,
68 NMI_FLAG_FIRST, "nmi_selftest")) {
69 nmi_fail = FAILURE;
70 return;
71 }
72
73 /* sync above data before sending NMI */
74 wmb();
75
76 apic->send_IPI_mask(mask, NMI_VECTOR);
77
78 /* Don't wait longer than a second */
79 timeout = USEC_PER_SEC;
80 while (!cpumask_empty(mask) && timeout--)
81 udelay(1);
82
83 /* What happens if we timeout, do we still unregister?? */
84 unregister_nmi_handler(NMI_LOCAL, "nmi_selftest");
85
86 if (!timeout)
87 nmi_fail = TIMEOUT;
88 return;
89}
90
91static void __init remote_ipi(void)
92{
93 cpumask_copy(to_cpumask(nmi_ipi_mask), cpu_online_mask);
94 cpumask_clear_cpu(smp_processor_id(), to_cpumask(nmi_ipi_mask));
95 if (!cpumask_empty(to_cpumask(nmi_ipi_mask)))
96 test_nmi_ipi(to_cpumask(nmi_ipi_mask));
97}
98
99static void __init local_ipi(void)
100{
101 cpumask_clear(to_cpumask(nmi_ipi_mask));
102 cpumask_set_cpu(smp_processor_id(), to_cpumask(nmi_ipi_mask));
103 test_nmi_ipi(to_cpumask(nmi_ipi_mask));
104}
105
106static void __init reset_nmi(void)
107{
108 nmi_fail = 0;
109}
110
111static void __init dotest(void (*testcase_fn)(void), int expected)
112{
113 testcase_fn();
114 /*
115 * Filter out expected failures:
116 */
117 if (nmi_fail != expected) {
118 unexpected_testcase_failures++;
119
120 if (nmi_fail == FAILURE)
121 printk(KERN_CONT "FAILED |");
122 else if (nmi_fail == TIMEOUT)
123 printk(KERN_CONT "TIMEOUT|");
124 else
125 printk(KERN_CONT "ERROR |");
126 dump_stack();
127 } else {
128 testcase_successes++;
129 printk(KERN_CONT " ok |");
130 }
131 testcase_total++;
132
133 reset_nmi();
134}
135
136static inline void __init print_testname(const char *testname)
137{
138 printk("%12s:", testname);
139}
140
141void __init nmi_selftest(void)
142{
143 init_nmi_testsuite();
144
145 /*
146 * Run the testsuite:
147 */
148 printk("----------------\n");
149 printk("| NMI testsuite:\n");
150 printk("--------------------\n");
151
152 print_testname("remote IPI");
153 dotest(remote_ipi, SUCCESS);
154 printk(KERN_CONT "\n");
155 print_testname("local IPI");
156 dotest(local_ipi, SUCCESS);
157 printk(KERN_CONT "\n");
158
159 cleanup_nmi_testsuite();
160
161 if (unexpected_testcase_failures) {
162 printk("--------------------\n");
163 printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
164 unexpected_testcase_failures, testcase_total);
165 printk("-----------------------------------------------------------------\n");
166 } else if (expected_testcase_failures && testcase_successes) {
167 printk("--------------------\n");
168 printk("%3d out of %3d testcases failed, as expected. |\n",
169 expected_testcase_failures, testcase_total);
170 printk("----------------------------------------------------\n");
171 } else if (expected_testcase_failures && !testcase_successes) {
172 printk("--------------------\n");
173 printk("All %3d testcases failed, as expected. |\n",
174 expected_testcase_failures);
175 printk("----------------------------------------\n");
176 } else {
177 printk("--------------------\n");
178 printk("Good, all %3d testcases passed! |\n",
179 testcase_successes);
180 printk("---------------------------------\n");
181 }
182}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * arch/x86/kernel/nmi-selftest.c
4 *
5 * Testsuite for NMI: IPIs
6 *
7 * Started by Don Zickus:
8 * (using lib/locking-selftest.c as a guide)
9 *
10 * Copyright (C) 2011 Red Hat, Inc., Don Zickus <dzickus@redhat.com>
11 */
12
13#include <linux/smp.h>
14#include <linux/cpumask.h>
15#include <linux/delay.h>
16#include <linux/init.h>
17#include <linux/percpu.h>
18
19#include <asm/apic.h>
20#include <asm/nmi.h>
21
22#define SUCCESS 0
23#define FAILURE 1
24#define TIMEOUT 2
25
26static int __initdata nmi_fail;
27
28/* check to see if NMI IPIs work on this machine */
29static DECLARE_BITMAP(nmi_ipi_mask, NR_CPUS) __initdata;
30
31static int __initdata testcase_total;
32static int __initdata testcase_successes;
33static int __initdata expected_testcase_failures;
34static int __initdata unexpected_testcase_failures;
35static int __initdata unexpected_testcase_unknowns;
36
37static int __init nmi_unk_cb(unsigned int val, struct pt_regs *regs)
38{
39 unexpected_testcase_unknowns++;
40 return NMI_HANDLED;
41}
42
43static void __init init_nmi_testsuite(void)
44{
45 /* trap all the unknown NMIs we may generate */
46 register_nmi_handler(NMI_UNKNOWN, nmi_unk_cb, 0, "nmi_selftest_unk",
47 __initdata);
48}
49
50static void __init cleanup_nmi_testsuite(void)
51{
52 unregister_nmi_handler(NMI_UNKNOWN, "nmi_selftest_unk");
53}
54
55static int __init test_nmi_ipi_callback(unsigned int val, struct pt_regs *regs)
56{
57 int cpu = raw_smp_processor_id();
58
59 if (cpumask_test_and_clear_cpu(cpu, to_cpumask(nmi_ipi_mask)))
60 return NMI_HANDLED;
61
62 return NMI_DONE;
63}
64
65static void __init test_nmi_ipi(struct cpumask *mask)
66{
67 unsigned long timeout;
68
69 if (register_nmi_handler(NMI_LOCAL, test_nmi_ipi_callback,
70 NMI_FLAG_FIRST, "nmi_selftest", __initdata)) {
71 nmi_fail = FAILURE;
72 return;
73 }
74
75 /* sync above data before sending NMI */
76 wmb();
77
78 __apic_send_IPI_mask(mask, NMI_VECTOR);
79
80 /* Don't wait longer than a second */
81 timeout = USEC_PER_SEC;
82 while (!cpumask_empty(mask) && --timeout)
83 udelay(1);
84
85 /* What happens if we timeout, do we still unregister?? */
86 unregister_nmi_handler(NMI_LOCAL, "nmi_selftest");
87
88 if (!timeout)
89 nmi_fail = TIMEOUT;
90 return;
91}
92
93static void __init remote_ipi(void)
94{
95 cpumask_copy(to_cpumask(nmi_ipi_mask), cpu_online_mask);
96 cpumask_clear_cpu(smp_processor_id(), to_cpumask(nmi_ipi_mask));
97 if (!cpumask_empty(to_cpumask(nmi_ipi_mask)))
98 test_nmi_ipi(to_cpumask(nmi_ipi_mask));
99}
100
101static void __init local_ipi(void)
102{
103 cpumask_clear(to_cpumask(nmi_ipi_mask));
104 cpumask_set_cpu(smp_processor_id(), to_cpumask(nmi_ipi_mask));
105 test_nmi_ipi(to_cpumask(nmi_ipi_mask));
106}
107
108static void __init reset_nmi(void)
109{
110 nmi_fail = 0;
111}
112
113static void __init dotest(void (*testcase_fn)(void), int expected)
114{
115 testcase_fn();
116 /*
117 * Filter out expected failures:
118 */
119 if (nmi_fail != expected) {
120 unexpected_testcase_failures++;
121
122 if (nmi_fail == FAILURE)
123 printk(KERN_CONT "FAILED |");
124 else if (nmi_fail == TIMEOUT)
125 printk(KERN_CONT "TIMEOUT|");
126 else
127 printk(KERN_CONT "ERROR |");
128 dump_stack();
129 } else {
130 testcase_successes++;
131 printk(KERN_CONT " ok |");
132 }
133 testcase_total++;
134
135 reset_nmi();
136}
137
138static inline void __init print_testname(const char *testname)
139{
140 printk("%12s:", testname);
141}
142
143void __init nmi_selftest(void)
144{
145 init_nmi_testsuite();
146
147 /*
148 * Run the testsuite:
149 */
150 printk("----------------\n");
151 printk("| NMI testsuite:\n");
152 printk("--------------------\n");
153
154 print_testname("remote IPI");
155 dotest(remote_ipi, SUCCESS);
156 printk(KERN_CONT "\n");
157 print_testname("local IPI");
158 dotest(local_ipi, SUCCESS);
159 printk(KERN_CONT "\n");
160
161 cleanup_nmi_testsuite();
162
163 if (unexpected_testcase_failures) {
164 printk("--------------------\n");
165 printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
166 unexpected_testcase_failures, testcase_total);
167 printk("-----------------------------------------------------------------\n");
168 } else if (expected_testcase_failures && testcase_successes) {
169 printk("--------------------\n");
170 printk("%3d out of %3d testcases failed, as expected. |\n",
171 expected_testcase_failures, testcase_total);
172 printk("----------------------------------------------------\n");
173 } else if (expected_testcase_failures && !testcase_successes) {
174 printk("--------------------\n");
175 printk("All %3d testcases failed, as expected. |\n",
176 expected_testcase_failures);
177 printk("----------------------------------------\n");
178 } else {
179 printk("--------------------\n");
180 printk("Good, all %3d testcases passed! |\n",
181 testcase_successes);
182 printk("---------------------------------\n");
183 }
184}