(2011/05/22 19:00), Ingo Molnar wrote:
> * huang ying <huang.ying.caritas@xxxxxxxxx> wrote:
>> How to do hardware error recovering in your perf framework? IMHO, it can be
>> something as follow:
>>
>> - NMI handler run for the hardware error, where hardware error
>> information is collected and put into a ring buffer, an irq_work is
>> triggered for further work
>> - In irq_work handler, memory_failure_queue() is called to do the real
>> recovering work for recoverable memory error in ring buffer.
>>
>> What's your idea about hardware error recovering in perf?
>
> The first step, the whole irq_work and ring buffer already looks largely
> duplicated: you can collect into a perf event ring-buffer from NMI context like
> the regular perf events do.
>
> The generalization that *would* make sense is not at the irq_work level really,
> instead we could generalize a 'struct event' for kernel internal producers and
> consumers of events that have no explicit PMU connection.
>
> This new 'struct event' would be slimmer and would only contain the fields and
> features that generic event consumers and producers need. Tracing events could
> be updated to use these kinds of slimmer events.
>
> It would still plug nicely into existing event ABIs, would work with event
> filters, etc. so the tooling side would remain focused and unified.
>
> Something like that. It is rather clear by now that splitting out irq_work was
> a mistake. But mistakes can be fixed and some really nice code could come out
> of it! Would you be interested in looking into this?
Err...?
Then is it better to write some nice code and throw away the following patch?
Thanks,
H.Seto
=====
[PATCH] x86, mce: replace MCE_SELF_VECTOR by irq_work
Use provided generic mechanism.
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx>
---
arch/x86/include/asm/entry_arch.h | 4 ---
arch/x86/include/asm/hw_irq.h | 1 -
arch/x86/include/asm/irq_vectors.h | 5 ----
arch/x86/kernel/cpu/mcheck/mce.c | 47 ++++-------------------------------
arch/x86/kernel/entry_64.S | 5 ----
arch/x86/kernel/irqinit.c | 3 --
6 files changed, 6 insertions(+), 59 deletions(-)
diff --git a/arch/x86/include/asm/entry_arch.h b/arch/x86/include/asm/entry_arch.h
index 1cd6d26..0baa628 100644
--- a/arch/x86/include/asm/entry_arch.h
+++ b/arch/x86/include/asm/entry_arch.h
@@ -53,8 +53,4 @@ BUILD_INTERRUPT(thermal_interrupt,THERMAL_APIC_VECTOR)
BUILD_INTERRUPT(threshold_interrupt,THRESHOLD_APIC_VECTOR)
#endif
-#ifdef CONFIG_X86_MCE
-BUILD_INTERRUPT(mce_self_interrupt,MCE_SELF_VECTOR)
-#endif
-
#endif
diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index bb9efe8..13f5504 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -34,7 +34,6 @@ extern void irq_work_interrupt(void);
extern void spurious_interrupt(void);
extern void thermal_interrupt(void);
extern void reschedule_interrupt(void);
-extern void mce_self_interrupt(void);
extern void invalidate_interrupt(void);
extern void invalidate_interrupt0(void);
diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
index 6e976ee..6665026 100644
--- a/arch/x86/include/asm/irq_vectors.h
+++ b/arch/x86/include/asm/irq_vectors.h
@@ -109,11 +109,6 @@
#define UV_BAU_MESSAGE 0xf5
-/*
- * Self IPI vector for machine checks
- */
-#define MCE_SELF_VECTOR 0xf4
-
/* Xen vector callback to receive events in a HVM domain */
#define XEN_HVM_EVTCHN_CALLBACK 0xf3
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index ff1ae9b..e81d48b 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -10,7 +10,6 @@
#include <linux/thread_info.h>
#include <linux/capability.h>
#include <linux/miscdevice.h>
-#include <linux/interrupt.h>
#include <linux/ratelimit.h>
#include <linux/kallsyms.h>
#include <linux/rcupdate.h>
@@ -38,12 +37,9 @@
#include <linux/mm.h>
#include <linux/debugfs.h>
#include <linux/edac_mce.h>
+#include <linux/irq_work.h>
#include <asm/processor.h>
-#include <asm/hw_irq.h>
-#include <asm/apic.h>
-#include <asm/idle.h>
-#include <asm/ipi.h>
#include <asm/mce.h>
#include <asm/msr.h>
@@ -461,22 +457,13 @@ static inline void mce_get_rip(struct mce *m, struct pt_regs *regs)
m->ip = mce_rdmsrl(rip_msr);
}
-#ifdef CONFIG_X86_LOCAL_APIC
-/*
- * Called after interrupts have been reenabled again
- * when a MCE happened during an interrupts off region
- * in the kernel.
- */
-asmlinkage void smp_mce_self_interrupt(struct pt_regs *regs)
+DEFINE_PER_CPU(struct irq_work, mce_irq_work);
+
+static void mce_irq_work_cb(struct irq_work *entry)
{
- ack_APIC_irq();
- exit_idle();
- irq_enter();
mce_notify_irq();
mce_schedule_work();
- irq_exit();
}
-#endif
static void mce_report_event(struct pt_regs *regs)
{
@@ -492,29 +479,7 @@ static void mce_report_event(struct pt_regs *regs)
return;
}
-#ifdef CONFIG_X86_LOCAL_APIC
- /*
- * Without APIC do not notify. The event will be picked
- * up eventually.
- */
- if (!cpu_has_apic)
- return;
-
- /*
- * When interrupts are disabled we cannot use
- * kernel services safely. Trigger an self interrupt
- * through the APIC to instead do the notification
- * after interrupts are reenabled again.
- */
- apic->send_IPI_self(MCE_SELF_VECTOR);
-
- /*
- * Wait for idle afterwards again so that we don't leave the
- * APIC in a non idle state because the normal APIC writes
- * cannot exclude us.
- */
- apic_wait_icr_idle();
-#endif
+ irq_work_queue(&__get_cpu_var(mce_irq_work));
}
DEFINE_PER_CPU(unsigned, mce_poll_count);
@@ -1444,7 +1409,7 @@ void __cpuinit mcheck_cpu_init(struct cpuinfo_x86 *c)
__mcheck_cpu_init_vendor(c);
__mcheck_cpu_init_timer();
INIT_WORK(&__get_cpu_var(mce_work), mce_process_work);
-
+ init_irq_work(&__get_cpu_var(mce_irq_work), &mce_irq_work_cb);
}
/*
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 8a445a0..9fa6546 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -991,11 +991,6 @@ apicinterrupt THRESHOLD_APIC_VECTOR \
apicinterrupt THERMAL_APIC_VECTOR \
thermal_interrupt smp_thermal_interrupt
-#ifdef CONFIG_X86_MCE
-apicinterrupt MCE_SELF_VECTOR \
- mce_self_interrupt smp_mce_self_interrupt
-#endif
-
#ifdef CONFIG_SMP
apicinterrupt CALL_FUNCTION_SINGLE_VECTOR \
call_function_single_interrupt smp_call_function_single_interrupt
diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index f470e4e..f09d4bb 100644
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -272,9 +272,6 @@ static void __init apic_intr_init(void)
#ifdef CONFIG_X86_MCE_THRESHOLD
alloc_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
#endif
-#if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_LOCAL_APIC)
- alloc_intr_gate(MCE_SELF_VECTOR, mce_self_interrupt);
-#endif
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
/* self generated IPI for local APIC timer */
--
1.7.4.4
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