| Message ID | 20200903234531.162484-3-Smita.KoralahalliChannabasappa@amd.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Decode raw MSR values of MCA registers in BERT | expand |
On Thu, Sep 03, 2020 at 06:45:31PM -0500, Smita Koralahalli wrote: > The mcelog utility is not commonly used on AMD systems. Therefore, errors > logged only by the dev_mce_log() notifier will be missed. This may occur > if the EDAC modules are not loaded in which case it's preferable to print > the error record by the default notifier. > > However, the mce->kflags set by dev_mce_log() notifier makes the default > notifier to skip over the errors assuming they are processed by > dev_mce_log(). > > Do not update kflags in the dev_mce_log() notifier on AMD systems. > > Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com> > --- > Link: > https://lkml.kernel.org/r/20200828203332.11129-3-Smita.KoralahalliChannabasappa@amd.com > > v3: > No change > v2: > No change > --- > arch/x86/kernel/cpu/mce/dev-mcelog.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/kernel/cpu/mce/dev-mcelog.c b/arch/x86/kernel/cpu/mce/dev-mcelog.c > index 03e51053592a..100fbeebdc72 100644 > --- a/arch/x86/kernel/cpu/mce/dev-mcelog.c > +++ b/arch/x86/kernel/cpu/mce/dev-mcelog.c > @@ -67,7 +67,9 @@ static int dev_mce_log(struct notifier_block *nb, unsigned long val, > unlock: > mutex_unlock(&mce_chrdev_read_mutex); > > - mce->kflags |= MCE_HANDLED_MCELOG; > + if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) > + mce->kflags |= MCE_HANDLED_MCELOG; > + > return NOTIFY_OK; > } > > -- This one is not related to your 1/2 so it sounds to me like I should take this one now, independently?
On 9/14/20 10:34 AM, Borislav Petkov wrote: > On Thu, Sep 03, 2020 at 06:45:31PM -0500, Smita Koralahalli wrote: >> The mcelog utility is not commonly used on AMD systems. Therefore, errors >> logged only by the dev_mce_log() notifier will be missed. This may occur >> if the EDAC modules are not loaded in which case it's preferable to print >> the error record by the default notifier. >> >> However, the mce->kflags set by dev_mce_log() notifier makes the default >> notifier to skip over the errors assuming they are processed by >> dev_mce_log(). >> >> Do not update kflags in the dev_mce_log() notifier on AMD systems. >> >> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com> >> --- >> Link: >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.kernel.org%2Fr%2F20200828203332.11129-3-Smita.KoralahalliChannabasappa%40amd.com&data=02%7C01%7CSmita.KoralahalliChannabasappa%40amd.com%7Cc452e9f80fe9459839c708d858c3a763%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637356944652485754&sdata=%2FhYQbBBNld1GtNX8%2FI6PERD0icYfy0e1k5zukQYI%2Fa4%3D&reserved=0 >> >> v3: >> No change >> v2: >> No change >> --- >> arch/x86/kernel/cpu/mce/dev-mcelog.c | 4 +++- >> 1 file changed, 3 insertions(+), 1 deletion(-) >> >> diff --git a/arch/x86/kernel/cpu/mce/dev-mcelog.c b/arch/x86/kernel/cpu/mce/dev-mcelog.c >> index 03e51053592a..100fbeebdc72 100644 >> --- a/arch/x86/kernel/cpu/mce/dev-mcelog.c >> +++ b/arch/x86/kernel/cpu/mce/dev-mcelog.c >> @@ -67,7 +67,9 @@ static int dev_mce_log(struct notifier_block *nb, unsigned long val, >> unlock: >> mutex_unlock(&mce_chrdev_read_mutex); >> >> - mce->kflags |= MCE_HANDLED_MCELOG; >> + if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) >> + mce->kflags |= MCE_HANDLED_MCELOG; >> + >> return NOTIFY_OK; >> } >> >> -- > This one is not related to your 1/2 so it sounds to me like I should > take this one now, independently? Yes, this can be taken independently. I just tagged it along as I came across the issue of missing error logs while trying to print error records in the previous patch. Thanks, Smita
diff --git a/arch/x86/kernel/cpu/mce/dev-mcelog.c b/arch/x86/kernel/cpu/mce/dev-mcelog.c index 03e51053592a..100fbeebdc72 100644 --- a/arch/x86/kernel/cpu/mce/dev-mcelog.c +++ b/arch/x86/kernel/cpu/mce/dev-mcelog.c @@ -67,7 +67,9 @@ static int dev_mce_log(struct notifier_block *nb, unsigned long val, unlock: mutex_unlock(&mce_chrdev_read_mutex); - mce->kflags |= MCE_HANDLED_MCELOG; + if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) + mce->kflags |= MCE_HANDLED_MCELOG; + return NOTIFY_OK; }
The mcelog utility is not commonly used on AMD systems. Therefore, errors logged only by the dev_mce_log() notifier will be missed. This may occur if the EDAC modules are not loaded in which case it's preferable to print the error record by the default notifier. However, the mce->kflags set by dev_mce_log() notifier makes the default notifier to skip over the errors assuming they are processed by dev_mce_log(). Do not update kflags in the dev_mce_log() notifier on AMD systems. Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com> --- Link: https://lkml.kernel.org/r/20200828203332.11129-3-Smita.KoralahalliChannabasappa@amd.com v3: No change v2: No change --- arch/x86/kernel/cpu/mce/dev-mcelog.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)