summaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/cpu/mcheck/mce-inject.c
diff options
context:
space:
mode:
authorChen Gong <gong.chen@linux.intel.com>2011-12-07 18:21:37 +0100
committerTony Luck <tony.luck@intel.com>2011-12-16 20:20:02 +0100
commit2c29d9dd577b74b44e580f957ea44d1df73af23a (patch)
tree37b2db16d3ceae8dbdde67d33c8f0826e3dec499 /arch/x86/kernel/cpu/mcheck/mce-inject.c
parentLinux 3.2-rc5 (diff)
downloadlinux-2c29d9dd577b74b44e580f957ea44d1df73af23a.tar.xz
linux-2c29d9dd577b74b44e580f957ea44d1df73af23a.zip
x86: add IRQ context simulation in module mce-inject
mce-inject provides a mechanism to simulate errors so that test scripts can check for correct operation of the kernel without requiring any specialized hardware to create rare events. The existing code can simulate events in normal process context and also in NMI context - but not in IRQ context. This patch fills that gap. Link: https://lkml.org/lkml/2011/12/7/537 Signed-off-by: Chen Gong <gong.chen@linux.intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/x86/kernel/cpu/mcheck/mce-inject.c')
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce-inject.c34
1 files changed, 30 insertions, 4 deletions
diff --git a/arch/x86/kernel/cpu/mcheck/mce-inject.c b/arch/x86/kernel/cpu/mcheck/mce-inject.c
index 319882ef848d..fc4beb393577 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-inject.c
+++ b/arch/x86/kernel/cpu/mcheck/mce-inject.c
@@ -17,6 +17,7 @@
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/fs.h>
+#include <linux/preempt.h>
#include <linux/smp.h>
#include <linux/notifier.h>
#include <linux/kdebug.h>
@@ -92,6 +93,18 @@ static int mce_raise_notify(unsigned int cmd, struct pt_regs *regs)
return NMI_HANDLED;
}
+static void mce_irq_ipi(void *info)
+{
+ int cpu = smp_processor_id();
+ struct mce *m = &__get_cpu_var(injectm);
+
+ if (cpumask_test_cpu(cpu, mce_inject_cpumask) &&
+ m->inject_flags & MCJ_EXCEPTION) {
+ cpumask_clear_cpu(cpu, mce_inject_cpumask);
+ raise_exception(m, NULL);
+ }
+}
+
/* Inject mce on current CPU */
static int raise_local(void)
{
@@ -139,9 +152,10 @@ static void raise_mce(struct mce *m)
return;
#ifdef CONFIG_X86_LOCAL_APIC
- if (m->inject_flags & MCJ_NMI_BROADCAST) {
+ if (m->inject_flags & (MCJ_IRQ_BRAODCAST | MCJ_NMI_BROADCAST)) {
unsigned long start;
int cpu;
+
get_online_cpus();
cpumask_copy(mce_inject_cpumask, cpu_online_mask);
cpumask_clear_cpu(get_cpu(), mce_inject_cpumask);
@@ -151,13 +165,25 @@ static void raise_mce(struct mce *m)
MCJ_CTX(mcpu->inject_flags) != MCJ_CTX_RANDOM)
cpumask_clear_cpu(cpu, mce_inject_cpumask);
}
- if (!cpumask_empty(mce_inject_cpumask))
- apic->send_IPI_mask(mce_inject_cpumask, NMI_VECTOR);
+ if (!cpumask_empty(mce_inject_cpumask)) {
+ if (m->inject_flags & MCJ_IRQ_BRAODCAST) {
+ /*
+ * don't wait because mce_irq_ipi is necessary
+ * to be sync with following raise_local
+ */
+ preempt_disable();
+ smp_call_function_many(mce_inject_cpumask,
+ mce_irq_ipi, NULL, 0);
+ preempt_enable();
+ } else if (m->inject_flags & MCJ_NMI_BROADCAST)
+ apic->send_IPI_mask(mce_inject_cpumask,
+ NMI_VECTOR);
+ }
start = jiffies;
while (!cpumask_empty(mce_inject_cpumask)) {
if (!time_before(jiffies, start + 2*HZ)) {
printk(KERN_ERR
- "Timeout waiting for mce inject NMI %lx\n",
+ "Timeout waiting for mce inject %lx\n",
*cpumask_bits(mce_inject_cpumask));
break;
}