![Linus Torvalds](/assets/img/avatar_default.png)
Pull x86/urgent branch from Ingo Molnar: "These are the fixes left over from the very end of the v3.4 stabilization cycle, plus one more fix." Ugh. Those KERN_CONT additions are just pointless. I think they came as a reaction to some of the early (broken) printk() work - but that was fixed before it was merged. * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, relocs: Build clean fix x86, printk: Add missing KERN_CONT to NMI selftest x86: Fix boot on Twinhead H12Y
183 lines
4.4 KiB
C
183 lines
4.4 KiB
C
/*
|
|
* 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 <linux/init.h>
|
|
#include <linux/percpu.h>
|
|
|
|
#include <asm/apic.h>
|
|
#include <asm/nmi.h>
|
|
|
|
#define SUCCESS 0
|
|
#define FAILURE 1
|
|
#define TIMEOUT 2
|
|
|
|
static int __initdata nmi_fail;
|
|
|
|
/* check to see if NMI IPIs work on this machine */
|
|
static DECLARE_BITMAP(nmi_ipi_mask, NR_CPUS) __initdata;
|
|
|
|
static int __initdata testcase_total;
|
|
static int __initdata testcase_successes;
|
|
static int __initdata expected_testcase_failures;
|
|
static int __initdata unexpected_testcase_failures;
|
|
static int __initdata unexpected_testcase_unknowns;
|
|
|
|
static int __init nmi_unk_cb(unsigned int val, struct pt_regs *regs)
|
|
{
|
|
unexpected_testcase_unknowns++;
|
|
return NMI_HANDLED;
|
|
}
|
|
|
|
static void __init 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 __init cleanup_nmi_testsuite(void)
|
|
{
|
|
unregister_nmi_handler(NMI_UNKNOWN, "nmi_selftest_unk");
|
|
}
|
|
|
|
static int __init 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 __init 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 __init 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 __init 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 __init reset_nmi(void)
|
|
{
|
|
nmi_fail = 0;
|
|
}
|
|
|
|
static void __init 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(KERN_CONT "FAILED |");
|
|
else if (nmi_fail == TIMEOUT)
|
|
printk(KERN_CONT "TIMEOUT|");
|
|
else
|
|
printk(KERN_CONT "ERROR |");
|
|
dump_stack();
|
|
} else {
|
|
testcase_successes++;
|
|
printk(KERN_CONT " ok |");
|
|
}
|
|
testcase_total++;
|
|
|
|
reset_nmi();
|
|
}
|
|
|
|
static inline void __init print_testname(const char *testname)
|
|
{
|
|
printk("%12s:", testname);
|
|
}
|
|
|
|
void __init 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(KERN_CONT "\n");
|
|
print_testname("local IPI");
|
|
dotest(local_ipi, SUCCESS);
|
|
printk(KERN_CONT "\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");
|
|
}
|
|
}
|