On 23.05.2014 18:48, Borislav Petkov wrote:
On Fri, May 23, 2014 at 02:06:47PM +0200, Tomasz Nowicki wrote:
I had that thoughts too. Looking at simple MCE calls, yes, it does
make sense to create corresponding arch-specific version and provide
logic as needed. I think that NMI is much more complicated....
How about this ontop of your patches. It builds here but it is not
trivial for me to try it on !X86. Maybe you can test it quicker than me
finding some other arch box first... :)
Now I do follow :) Nicely done, I have applied your patch and indeed
there are more arch dependencies for !X86. I created another patch (it
can be applied on top of last patch set). Does it look reasonable?
diff --git a/arch/x86/include/asm/nmi.h b/arch/x86/include/asm/nmi.h
index 86f9301..0f03ab6 100644
--- a/arch/x86/include/asm/nmi.h
+++ b/arch/x86/include/asm/nmi.h
@@ -54,7 +54,18 @@ struct nmiaction {
int __register_nmi_handler(unsigned int, struct nmiaction *);
-void unregister_nmi_handler(unsigned int, const char *);
+void unregister_nmi_handler(unsigned int type, const char *name);
+
+static inline int arch_apei_register_nmi(nmi_handler_t fn,
+ const char *name)
+{
+ return register_nmi_handler(NMI_LOCAL, fn, 0, name);
+}
+
+static inline void arch_apei_unregister_nmi(const char *name)
+{
+ unregister_nmi_handler(NMI_LOCAL, name);
+}
void stop_nmi(void);
void restart_nmi(void);
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 35a44d9..84c79af 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -47,13 +47,11 @@
#include <linux/genalloc.h>
#include <linux/pci.h>
#include <linux/aer.h>
+#include <linux/nmi.h>
#include <acpi/ghes.h>
#include <asm/apei.h>
#include <asm/tlbflush.h>
-#ifdef CONFIG_ACPI_APEI_NMI
-#include <asm/nmi.h>
-#endif
#include "apei-internal.h"
@@ -718,7 +716,6 @@ static int ghes_notify_sci(struct notifier_block *this,
return ret;
}
-#ifdef CONFIG_ACPI_APEI_NMI
/*
* printk is not safe in NMI context. So in NMI handler, we allocate
* required memory from lock-less memory allocator
@@ -817,7 +814,7 @@ static int ghes_notify_nmi(unsigned int cmd, struct
pt_regs *regs)
{
struct ghes *ghes, *ghes_global = NULL;
int sev, sev_global = -1;
- int ret = NMI_DONE;
+ int ret = APEI_NMI_DONE;
BUG_ON(!IS_ENABLED(CONFIG_ACPI_APEI_NMI));
@@ -832,14 +829,14 @@ static int ghes_notify_nmi(unsigned int cmd,
struct pt_regs *regs)
sev_global = sev;
ghes_global = ghes;
}
- ret = NMI_HANDLED;
+ ret = APEI_NMI_HANDLED;
}
- if (ret == NMI_DONE)
+ if (ret == APEI_NMI_DONE)
goto out;
if (sev_global >= GHES_SEV_PANIC) {
- oops_begin();
+ arch_apei_nmi_oops_begin();
ghes_print_queued_estatus();
__ghes_print_estatus(KERN_EMERG, ghes_global->generic,
ghes_global->estatus);
@@ -914,7 +911,7 @@ static int ghes_notify_init_nmi(struct ghes *ghes)
ghes_estatus_pool_expand(len);
mutex_lock(&ghes_list_mutex);
if (list_empty(&ghes_nmi))
- status = register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0, "ghes");
+ status = arch_apei_register_nmi(ghes_notify_nmi, "ghes");
list_add_rcu(&ghes->list, &ghes_nmi);
mutex_unlock(&ghes_list_mutex);
@@ -928,7 +925,7 @@ static void ghes_notify_remove_nmi(struct ghes *ghes)
mutex_lock(&ghes_list_mutex);
list_del_rcu(&ghes->list);
if (list_empty(&ghes_nmi))
- unregister_nmi_handler(NMI_LOCAL, "ghes");
+ arch_apei_unregister_nmi("ghes");
mutex_unlock(&ghes_list_mutex);
/*
* To synchronize with NMI handler, ghes can only be
@@ -941,17 +938,14 @@ static void ghes_notify_remove_nmi(struct ghes *ghes)
static void ghes_init_nmi(void)
{
+ if (!IS_ENABLED(CONFIG_ACPI_APEI_NMI))
+ return;
+
init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
ghes_notify_tab[ACPI_HEST_NOTIFY_NMI].init_call = ghes_notify_init_nmi;
ghes_notify_tab[ACPI_HEST_NOTIFY_NMI].remove_call =
ghes_notify_remove_nmi;
}
-#else
-static inline void ghes_init_nmi(void)
-{
-
-}
-#endif
static int ghes_notify_init_polled(struct ghes *ghes)
{
diff --git a/include/linux/nmi.h b/include/linux/nmi.h
index 084b4c5..1aa351c 100644
--- a/include/linux/nmi.h
+++ b/include/linux/nmi.h
@@ -56,4 +56,19 @@ extern int proc_dowatchdog(struct ctl_table *, int ,
void __user *, size_t *, loff_t *);
#endif
+#define APEI_NMI_DONE 0
+#define APEI_NMI_HANDLED 1
+
+#ifdef CONFIG_ACPI_APEI_NMI
+#include <asm/nmi.h>
+#define arch_apei_nmi_oops_begin() oops_begin()
+#else
+#define arch_apei_register_nmi(fn, n) ({ \
+ void __attribute__((unused)) *dummy = fn; \
+ (-ENOSYS); \
+});
+#define arch_apei_unregister_nmi(n)
+#define arch_apei_nmi_oops_begin()
+#endif /* CONFIG_ACPI_APEI_NMI */
+
#endif
Regards,
Tomasz
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