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SubjectRe: [PATCH v2 4/7] x86/mce: Fix all mce notifiers to update the mce->kflags bitmask
On Fri, Feb 14, 2020 at 02:27:17PM -0800, Tony Luck wrote:
> If the handler took any action to log or deal with the error, set
> a bit int mce->kflags so that the default handler on the end of
> the machine check chain can see what has been done.
>
> Get rid of NOTIFY_STOP (well almost ... mce_amd.c is currently using
> it to filter out some GART TLB errors ... need to deal with that
> later).

Here's me dealing with it :-)

Btw, no need to resend with it - I'm already queueing it all locally
here along with more rework ontop and send it all once done.

Thx.

---
From 3eee69c7cf32578aafe050051d0406a1e6fbacbb Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Tue, 7 Apr 2020 09:55:10 +0200
Subject: [PATCH] x86/mce/amd, edac: Remove report_gart_errors

... because no one should be interested in spurious MCEs anyway. Make
the filtering unconditional and move it to amd_filter_mce().

Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/include/asm/mce.h | 3 ++-
arch/x86/kernel/cpu/mce/amd.c | 9 +++++++--
drivers/edac/amd64_edac.c | 8 --------
drivers/edac/mce_amd.c | 24 ------------------------
drivers/edac/mce_amd.h | 2 --
5 files changed, 9 insertions(+), 37 deletions(-)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index f9cea081c05b..83b6ddafa032 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -127,6 +127,8 @@
#define MSR_AMD64_SMCA_MCx_DEADDR(x) (MSR_AMD64_SMCA_MC0_DEADDR + 0x10*(x))
#define MSR_AMD64_SMCA_MCx_MISCy(x, y) ((MSR_AMD64_SMCA_MC0_MISC1 + y) + (0x10*(x)))

+#define XEC(x, mask) (((x) >> 16) & mask)
+
/*
* This structure contains all data related to the MCE log. Also
* carries a signature to make it easier to find from external
@@ -347,5 +349,4 @@ umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr) { return
#endif

static inline void mce_hygon_feature_init(struct cpuinfo_x86 *c) { return mce_amd_feature_init(c); }
-
#endif /* _ASM_X86_MCE_H */
diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 15c87b87b901..ea3cf714b7ad 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -577,14 +577,19 @@ bool amd_filter_mce(struct mce *m)
{
enum smca_bank_types bank_type = smca_get_bank_type(m->bank);
struct cpuinfo_x86 *c = &boot_cpu_data;
- u8 xec = (m->status >> 16) & 0x3F;

/* See Family 17h Models 10h-2Fh Erratum #1114. */
if (c->x86 == 0x17 &&
c->x86_model >= 0x10 && c->x86_model <= 0x2F &&
- bank_type == SMCA_IF && xec == 10)
+ bank_type == SMCA_IF && XEC(m->status, 0x3f) == 10)
return true;

+ /* NB GART TLB error reporting is disabled by default. */
+ if (c->x86 < 0x17) {
+ if (m->bank == 4 && XEC(m->status, 0x1f) == 0x5)
+ return true;
+ }
+
return false;
}

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index f91f3bc1e0b2..6bdc5bb8c8bc 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -4,9 +4,6 @@

static struct edac_pci_ctl_info *pci_ctl;

-static int report_gart_errors;
-module_param(report_gart_errors, int, 0644);
-
/*
* Set by command line parameter. If BIOS has enabled the ECC, this override is
* cleared to prevent re-enabling the hardware by this driver.
@@ -3681,9 +3678,6 @@ static int __init amd64_edac_init(void)
}

/* register stuff with EDAC MCE */
- if (report_gart_errors)
- amd_report_gart_errors(true);
-
if (boot_cpu_data.x86 >= 0x17)
amd_register_ecc_decoder(decode_umc_error);
else
@@ -3718,8 +3712,6 @@ static void __exit amd64_edac_exit(void)
edac_pci_release_generic_ctl(pci_ctl);

/* unregister from EDAC MCE */
- amd_report_gart_errors(false);
-
if (boot_cpu_data.x86 >= 0x17)
amd_unregister_ecc_decoder(decode_umc_error);
else
diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c
index 8874b7722b2f..e58644d9c92b 100644
--- a/drivers/edac/mce_amd.c
+++ b/drivers/edac/mce_amd.c
@@ -10,15 +10,8 @@ static struct amd_decoder_ops fam_ops;

static u8 xec_mask = 0xf;

-static bool report_gart_errors;
static void (*decode_dram_ecc)(int node_id, struct mce *m);

-void amd_report_gart_errors(bool v)
-{
- report_gart_errors = v;
-}
-EXPORT_SYMBOL_GPL(amd_report_gart_errors);
-
void amd_register_ecc_decoder(void (*f)(int, struct mce *))
{
decode_dram_ecc = f;
@@ -1030,20 +1023,6 @@ static inline void amd_decode_err_code(u16 ec)
pr_cont("\n");
}

-/*
- * Filter out unwanted MCE signatures here.
- */
-static bool ignore_mce(struct mce *m)
-{
- /*
- * NB GART TLB error reporting is disabled by default.
- */
- if (m->bank == 4 && XEC(m->status, 0x1f) == 0x5 && !report_gart_errors)
- return true;
-
- return false;
-}
-
static const char *decode_error_status(struct mce *m)
{
if (m->status & MCI_STATUS_UC) {
@@ -1067,9 +1046,6 @@ amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
unsigned int fam = x86_family(m->cpuid);
int ecc;

- if (ignore_mce(m))
- return NOTIFY_STOP;
-
pr_emerg(HW_ERR "%s\n", decode_error_status(m));

pr_emerg(HW_ERR "CPU:%d (%x:%x:%x) MC%d_STATUS[%s|%s|%s|%s|%s",
diff --git a/drivers/edac/mce_amd.h b/drivers/edac/mce_amd.h
index 4e9c5e596c6c..4811b18d9606 100644
--- a/drivers/edac/mce_amd.h
+++ b/drivers/edac/mce_amd.h
@@ -7,7 +7,6 @@
#include <asm/mce.h>

#define EC(x) ((x) & 0xffff)
-#define XEC(x, mask) (((x) >> 16) & mask)

#define LOW_SYNDROME(x) (((x) >> 15) & 0xff)
#define HIGH_SYNDROME(x) (((x) >> 24) & 0xff)
@@ -77,7 +76,6 @@ struct amd_decoder_ops {
bool (*mc2_mce)(u16, u8);
};

-void amd_report_gart_errors(bool);
void amd_register_ecc_decoder(void (*f)(int, struct mce *));
void amd_unregister_ecc_decoder(void (*f)(int, struct mce *));

--
2.21.0
--
Regards/Gruss,
Boris.

https://people.kernel.org/tglx/notes-about-netiquette

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