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Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/li…
…nux/kernel/git/tip/tip * 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, reboot: Fix typo in nmi reboot path x86, NMI: Add to_cpumask() to silence compile warning x86, NMI: NMI selftest depends on the local apic x86: Add stack top margin for stack overflow checking x86, NMI: NMI-selftest should handle the UP case properly x86: Fix the 32-bit stackoverflow-debug build x86, NMI: Add knob to disable using NMI IPIs to stop cpus x86, NMI: Add NMI IPI selftest x86, reboot: Use NMI instead of REBOOT_VECTOR to stop cpus x86: Clean up the range of stack overflow checking x86: Panic on detection of stack overflow x86: Check stack overflow in detail
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,180 @@ | ||
| /* | ||
| * arch/x86/kernel/nmi-selftest.c | ||
| * | ||
| * Testsuite for NMI: IPIs | ||
| * | ||
| * Started by Don Zickus: | ||
| * (using lib/locking-selftest.c as a guide) | ||
| * | ||
| * Copyright (C) 2011 Red Hat, Inc., Don Zickus <dzickus@redhat.com> | ||
| */ | ||
|
|
||
| #include <linux/smp.h> | ||
| #include <linux/cpumask.h> | ||
| #include <linux/delay.h> | ||
|
|
||
| #include <asm/apic.h> | ||
| #include <asm/nmi.h> | ||
|
|
||
| #define SUCCESS 0 | ||
| #define FAILURE 1 | ||
| #define TIMEOUT 2 | ||
|
|
||
| static int nmi_fail; | ||
|
|
||
| /* check to see if NMI IPIs work on this machine */ | ||
| static DECLARE_BITMAP(nmi_ipi_mask, NR_CPUS) __read_mostly; | ||
|
|
||
| static int testcase_total; | ||
| static int testcase_successes; | ||
| static int expected_testcase_failures; | ||
| static int unexpected_testcase_failures; | ||
| static int unexpected_testcase_unknowns; | ||
|
|
||
| static int nmi_unk_cb(unsigned int val, struct pt_regs *regs) | ||
| { | ||
| unexpected_testcase_unknowns++; | ||
| return NMI_HANDLED; | ||
| } | ||
|
|
||
| static void init_nmi_testsuite(void) | ||
| { | ||
| /* trap all the unknown NMIs we may generate */ | ||
| register_nmi_handler(NMI_UNKNOWN, nmi_unk_cb, 0, "nmi_selftest_unk"); | ||
| } | ||
|
|
||
| static void cleanup_nmi_testsuite(void) | ||
| { | ||
| unregister_nmi_handler(NMI_UNKNOWN, "nmi_selftest_unk"); | ||
| } | ||
|
|
||
| static int test_nmi_ipi_callback(unsigned int val, struct pt_regs *regs) | ||
| { | ||
| int cpu = raw_smp_processor_id(); | ||
|
|
||
| if (cpumask_test_and_clear_cpu(cpu, to_cpumask(nmi_ipi_mask))) | ||
| return NMI_HANDLED; | ||
|
|
||
| return NMI_DONE; | ||
| } | ||
|
|
||
| static void test_nmi_ipi(struct cpumask *mask) | ||
| { | ||
| unsigned long timeout; | ||
|
|
||
| if (register_nmi_handler(NMI_LOCAL, test_nmi_ipi_callback, | ||
| NMI_FLAG_FIRST, "nmi_selftest")) { | ||
| nmi_fail = FAILURE; | ||
| return; | ||
| } | ||
|
|
||
| /* sync above data before sending NMI */ | ||
| wmb(); | ||
|
|
||
| apic->send_IPI_mask(mask, NMI_VECTOR); | ||
|
|
||
| /* Don't wait longer than a second */ | ||
| timeout = USEC_PER_SEC; | ||
| while (!cpumask_empty(mask) && timeout--) | ||
| udelay(1); | ||
|
|
||
| /* What happens if we timeout, do we still unregister?? */ | ||
| unregister_nmi_handler(NMI_LOCAL, "nmi_selftest"); | ||
|
|
||
| if (!timeout) | ||
| nmi_fail = TIMEOUT; | ||
| return; | ||
| } | ||
|
|
||
| static void remote_ipi(void) | ||
| { | ||
| cpumask_copy(to_cpumask(nmi_ipi_mask), cpu_online_mask); | ||
| cpumask_clear_cpu(smp_processor_id(), to_cpumask(nmi_ipi_mask)); | ||
| if (!cpumask_empty(to_cpumask(nmi_ipi_mask))) | ||
| test_nmi_ipi(to_cpumask(nmi_ipi_mask)); | ||
| } | ||
|
|
||
| static void local_ipi(void) | ||
| { | ||
| cpumask_clear(to_cpumask(nmi_ipi_mask)); | ||
| cpumask_set_cpu(smp_processor_id(), to_cpumask(nmi_ipi_mask)); | ||
| test_nmi_ipi(to_cpumask(nmi_ipi_mask)); | ||
| } | ||
|
|
||
| static void reset_nmi(void) | ||
| { | ||
| nmi_fail = 0; | ||
| } | ||
|
|
||
| static void dotest(void (*testcase_fn)(void), int expected) | ||
| { | ||
| testcase_fn(); | ||
| /* | ||
| * Filter out expected failures: | ||
| */ | ||
| if (nmi_fail != expected) { | ||
| unexpected_testcase_failures++; | ||
|
|
||
| if (nmi_fail == FAILURE) | ||
| printk("FAILED |"); | ||
| else if (nmi_fail == TIMEOUT) | ||
| printk("TIMEOUT|"); | ||
| else | ||
| printk("ERROR |"); | ||
| dump_stack(); | ||
| } else { | ||
| testcase_successes++; | ||
| printk(" ok |"); | ||
| } | ||
| testcase_total++; | ||
|
|
||
| reset_nmi(); | ||
| } | ||
|
|
||
| static inline void print_testname(const char *testname) | ||
| { | ||
| printk("%12s:", testname); | ||
| } | ||
|
|
||
| void nmi_selftest(void) | ||
| { | ||
| init_nmi_testsuite(); | ||
|
|
||
| /* | ||
| * Run the testsuite: | ||
| */ | ||
| printk("----------------\n"); | ||
| printk("| NMI testsuite:\n"); | ||
| printk("--------------------\n"); | ||
|
|
||
| print_testname("remote IPI"); | ||
| dotest(remote_ipi, SUCCESS); | ||
| printk("\n"); | ||
| print_testname("local IPI"); | ||
| dotest(local_ipi, SUCCESS); | ||
| printk("\n"); | ||
|
|
||
| cleanup_nmi_testsuite(); | ||
|
|
||
| if (unexpected_testcase_failures) { | ||
| printk("--------------------\n"); | ||
| printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n", | ||
| unexpected_testcase_failures, testcase_total); | ||
| printk("-----------------------------------------------------------------\n"); | ||
| } else if (expected_testcase_failures && testcase_successes) { | ||
| printk("--------------------\n"); | ||
| printk("%3d out of %3d testcases failed, as expected. |\n", | ||
| expected_testcase_failures, testcase_total); | ||
| printk("----------------------------------------------------\n"); | ||
| } else if (expected_testcase_failures && !testcase_successes) { | ||
| printk("--------------------\n"); | ||
| printk("All %3d testcases failed, as expected. |\n", | ||
| expected_testcase_failures); | ||
| printk("----------------------------------------\n"); | ||
| } else { | ||
| printk("--------------------\n"); | ||
| printk("Good, all %3d testcases passed! |\n", | ||
| testcase_successes); | ||
| printk("---------------------------------\n"); | ||
| } | ||
| } |
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