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05279a2863
The expected_testcase_failures variable in the NMI selftest has never
been set since its introduction. Remove this unused variable along with
the related checks to simplify the code.
While at it, replace printk() with the corresponding pr_{cont,info}()
calls. Also, get rid of the superfluous testname wrapper and the
redundant file path comment.
Signed-off-by: Sohil Mehta <sohil.mehta@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
Link: https://lore.kernel.org/r/20250327234629.3953536-9-sohil.mehta@intel.com
165 lines
3.7 KiB
C
165 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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 <linux/init.h>
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#include <linux/percpu.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 __initdata 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) __initdata;
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static int __initdata testcase_total;
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static int __initdata testcase_successes;
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static int __initdata unexpected_testcase_failures;
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static int __initdata unexpected_testcase_unknowns;
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static int __init 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 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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__initdata);
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}
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static void __init 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 __init 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 __init 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", __initdata)) {
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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 __init 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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if (!cpumask_empty(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 __init 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 __init reset_nmi(void)
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{
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nmi_fail = 0;
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}
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static void __init 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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pr_cont("FAILED |");
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else if (nmi_fail == TIMEOUT)
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pr_cont("TIMEOUT|");
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else
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pr_cont("ERROR |");
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dump_stack();
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} else {
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testcase_successes++;
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pr_cont(" ok |");
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}
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pr_cont("\n");
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testcase_total++;
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reset_nmi();
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}
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void __init 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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pr_info("----------------\n");
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pr_info("| NMI testsuite:\n");
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pr_info("--------------------\n");
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pr_info("%12s:", "remote IPI");
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dotest(remote_ipi, SUCCESS);
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pr_info("%12s:", "local IPI");
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dotest(local_ipi, SUCCESS);
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cleanup_nmi_testsuite();
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pr_info("--------------------\n");
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if (unexpected_testcase_failures) {
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pr_info("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
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unexpected_testcase_failures, testcase_total);
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} else {
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pr_info("Good, all %3d testcases passed! |\n",
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testcase_successes);
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}
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pr_info("-----------------------------------------------------------------\n");
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}
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