x86, NMI: Add NMI IPI selftest
The previous patch modified the stop cpus path to use NMI instead of IRQ as the way to communicate to the other cpus to shutdown. There were some concerns that various machines may have problems with using an NMI IPI. This patch creates a selftest to check if NMI is working at boot. The idea is to help catch any issues before the machine panics and we learn the hard way. Loosely based on the locking-selftest.c file, this separate file runs a couple of simple tests and reports the results. The output looks like: ... Brought up 4 CPUs ---------------- | NMI testsuite: -------------------- remote IPI: ok | local IPI: ok | -------------------- Good, all 2 testcases passed! | --------------------------------- Total of 4 processors activated (21330.61 BogoMIPS). ... Signed-off-by: Don Zickus <dzickus@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Robert Richter <robert.richter@amd.com> Cc: seiji.aguchi@hds.com Cc: vgoyal@redhat.com Cc: mjg@redhat.com Cc: tony.luck@intel.com Cc: gong.chen@intel.com Cc: satoru.moriya@hds.com Cc: avi@redhat.com Cc: Andi Kleen <andi@firstfloor.org> Link: http://lkml.kernel.org/r/1318533267-18880-3-git-send-email-dzickus@redhat.com Signed-off-by: Ingo Molnar <mingo@elte.hu>hifive-unleashed-5.1
Don Zickus
Ingo Molnar
parent
3603a2512f
commit
99e8b9ca90
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@ -287,4 +287,16 @@ config DEBUG_STRICT_USER_COPY_CHECKS
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If unsure, or if you run an older (pre 4.4) gcc, say N.
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config DEBUG_NMI_SELFTEST
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bool "NMI Selftest"
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depends on DEBUG_KERNEL
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---help---
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Enabling this option turns on a quick NMI selftest to verify
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that the NMI behaves correctly.
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This might help diagnose strange hangs that rely on NMI to
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function properly.
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If unsure, say N.
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endmenu
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@ -225,5 +225,11 @@ extern int hard_smp_processor_id(void);
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#endif /* CONFIG_X86_LOCAL_APIC */
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#ifdef CONFIG_DEBUG_NMI_SELFTEST
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extern void nmi_selftest(void);
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#else
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#define nmi_selftest() do { } while (0)
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_X86_SMP_H */
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@ -80,6 +80,7 @@ obj-$(CONFIG_APB_TIMER) += apb_timer.o
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obj-$(CONFIG_AMD_NB) += amd_nb.o
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obj-$(CONFIG_DEBUG_RODATA_TEST) += test_rodata.o
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obj-$(CONFIG_DEBUG_NX_TEST) += test_nx.o
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obj-$(CONFIG_DEBUG_NMI_SELFTEST) += nmi_selftest.o
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obj-$(CONFIG_KVM_GUEST) += kvm.o
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obj-$(CONFIG_KVM_CLOCK) += kvmclock.o
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@ -0,0 +1,179 @@
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/*
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* arch/x86/kernel/nmi-selftest.c
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*
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* Testsuite for NMI: IPIs
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*
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* Started by Don Zickus:
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* (using lib/locking-selftest.c as a guide)
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*
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* Copyright (C) 2011 Red Hat, Inc., Don Zickus <dzickus@redhat.com>
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*/
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#include <linux/smp.h>
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#include <linux/cpumask.h>
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#include <linux/delay.h>
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#include <asm/apic.h>
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#include <asm/nmi.h>
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#define SUCCESS 0
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#define FAILURE 1
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#define TIMEOUT 2
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static int nmi_fail;
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/* check to see if NMI IPIs work on this machine */
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static DECLARE_BITMAP(nmi_ipi_mask, NR_CPUS) __read_mostly;
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static int testcase_total;
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static int testcase_successes;
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static int expected_testcase_failures;
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static int unexpected_testcase_failures;
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static int unexpected_testcase_unknowns;
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static int nmi_unk_cb(unsigned int val, struct pt_regs *regs)
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{
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unexpected_testcase_unknowns++;
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return NMI_HANDLED;
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}
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static void init_nmi_testsuite(void)
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{
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/* trap all the unknown NMIs we may generate */
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register_nmi_handler(NMI_UNKNOWN, nmi_unk_cb, 0, "nmi_selftest_unk");
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}
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static void cleanup_nmi_testsuite(void)
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{
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unregister_nmi_handler(NMI_UNKNOWN, "nmi_selftest_unk");
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}
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static int test_nmi_ipi_callback(unsigned int val, struct pt_regs *regs)
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{
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int cpu = raw_smp_processor_id();
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if (cpumask_test_and_clear_cpu(cpu, to_cpumask(nmi_ipi_mask)))
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return NMI_HANDLED;
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return NMI_DONE;
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}
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static void test_nmi_ipi(struct cpumask *mask)
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{
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unsigned long timeout;
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if (register_nmi_handler(NMI_LOCAL, test_nmi_ipi_callback,
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NMI_FLAG_FIRST, "nmi_selftest")) {
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nmi_fail = FAILURE;
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return;
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}
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/* sync above data before sending NMI */
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wmb();
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apic->send_IPI_mask(mask, NMI_VECTOR);
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/* Don't wait longer than a second */
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timeout = USEC_PER_SEC;
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while (!cpumask_empty(mask) && timeout--)
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udelay(1);
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/* What happens if we timeout, do we still unregister?? */
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unregister_nmi_handler(NMI_LOCAL, "nmi_selftest");
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if (!timeout)
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nmi_fail = TIMEOUT;
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return;
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}
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static void remote_ipi(void)
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{
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cpumask_copy(to_cpumask(nmi_ipi_mask), cpu_online_mask);
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cpumask_clear_cpu(smp_processor_id(), to_cpumask(nmi_ipi_mask));
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test_nmi_ipi(to_cpumask(nmi_ipi_mask));
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}
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static void local_ipi(void)
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{
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cpumask_clear(to_cpumask(nmi_ipi_mask));
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cpumask_set_cpu(smp_processor_id(), to_cpumask(nmi_ipi_mask));
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test_nmi_ipi(to_cpumask(nmi_ipi_mask));
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}
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static void reset_nmi(void)
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{
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nmi_fail = 0;
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}
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static void dotest(void (*testcase_fn)(void), int expected)
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{
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testcase_fn();
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/*
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* Filter out expected failures:
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*/
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if (nmi_fail != expected) {
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unexpected_testcase_failures++;
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if (nmi_fail == FAILURE)
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printk("FAILED |");
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else if (nmi_fail == TIMEOUT)
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printk("TIMEOUT|");
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else
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printk("ERROR |");
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dump_stack();
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} else {
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testcase_successes++;
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printk(" ok |");
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}
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testcase_total++;
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reset_nmi();
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}
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static inline void print_testname(const char *testname)
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{
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printk("%12s:", testname);
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}
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void nmi_selftest(void)
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{
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init_nmi_testsuite();
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/*
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* Run the testsuite:
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*/
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printk("----------------\n");
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printk("| NMI testsuite:\n");
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printk("--------------------\n");
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print_testname("remote IPI");
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dotest(remote_ipi, SUCCESS);
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printk("\n");
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print_testname("local IPI");
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dotest(local_ipi, SUCCESS);
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printk("\n");
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cleanup_nmi_testsuite();
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if (unexpected_testcase_failures) {
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printk("--------------------\n");
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printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
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unexpected_testcase_failures, testcase_total);
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printk("-----------------------------------------------------------------\n");
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} else if (expected_testcase_failures && testcase_successes) {
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printk("--------------------\n");
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printk("%3d out of %3d testcases failed, as expected. |\n",
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expected_testcase_failures, testcase_total);
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printk("----------------------------------------------------\n");
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} else if (expected_testcase_failures && !testcase_successes) {
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printk("--------------------\n");
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printk("All %3d testcases failed, as expected. |\n",
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expected_testcase_failures);
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printk("----------------------------------------\n");
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} else {
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printk("--------------------\n");
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printk("Good, all %3d testcases passed! |\n",
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testcase_successes);
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printk("---------------------------------\n");
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}
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}
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@ -1142,6 +1142,7 @@ void __init native_smp_cpus_done(unsigned int max_cpus)
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{
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pr_debug("Boot done.\n");
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nmi_selftest();
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impress_friends();
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#ifdef CONFIG_X86_IO_APIC
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setup_ioapic_dest();
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