From: Yazen Ghannam <[email protected]>
The Extended Error Code Bitmap (xec_bitmap) for a Scalable MCA bank type
was intended to be used by the kernel to filter out invalid error codes
on a system. However, this is unnecessary because the hardware will only
report valid error codes.
Remove the xec_bitmap field and all references to it.
Signed-off-by: Yazen Ghannam <[email protected]>
---
arch/x86/include/asm/mce.h | 1 -
arch/x86/kernel/cpu/mce/amd.c | 44 +++++++++++++++++------------------
drivers/edac/mce_amd.c | 4 +---
3 files changed, 23 insertions(+), 26 deletions(-)
diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 734ffe78a3d6..c18e87aeeccc 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -327,7 +327,6 @@ enum smca_bank_types {
struct smca_hwid {
unsigned int bank_type; /* Use with smca_bank_types for easy indexing. */
u32 hwid_mcatype; /* (hwid,mcatype) tuple */
- u32 xec_bitmap; /* Bitmap of valid ExtErrorCodes; current max is 21. */
u8 count; /* Number of instances. */
};
diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 327b85304cdd..a578df70768b 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -132,49 +132,49 @@ static enum smca_bank_types smca_get_bank_type(unsigned int bank)
}
static struct smca_hwid smca_hwid_mcatypes[] = {
- /* { bank_type, hwid_mcatype, xec_bitmap } */
+ /* { bank_type, hwid_mcatype } */
/* Reserved type */
- { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0), 0x0 },
+ { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0) },
/* ZN Core (HWID=0xB0) MCA types */
- { SMCA_LS, HWID_MCATYPE(0xB0, 0x0), 0x1FFFFF },
- { SMCA_LS_V2, HWID_MCATYPE(0xB0, 0x10), 0xFFFFFF },
- { SMCA_IF, HWID_MCATYPE(0xB0, 0x1), 0x3FFF },
- { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2), 0xF },
- { SMCA_DE, HWID_MCATYPE(0xB0, 0x3), 0x1FF },
+ { SMCA_LS, HWID_MCATYPE(0xB0, 0x0) },
+ { SMCA_LS_V2, HWID_MCATYPE(0xB0, 0x10) },
+ { SMCA_IF, HWID_MCATYPE(0xB0, 0x1) },
+ { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2) },
+ { SMCA_DE, HWID_MCATYPE(0xB0, 0x3) },
/* HWID 0xB0 MCATYPE 0x4 is Reserved */
- { SMCA_EX, HWID_MCATYPE(0xB0, 0x5), 0xFFF },
- { SMCA_FP, HWID_MCATYPE(0xB0, 0x6), 0x7F },
- { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7), 0xFF },
+ { SMCA_EX, HWID_MCATYPE(0xB0, 0x5) },
+ { SMCA_FP, HWID_MCATYPE(0xB0, 0x6) },
+ { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7) },
/* Data Fabric MCA types */
- { SMCA_CS, HWID_MCATYPE(0x2E, 0x0), 0x1FF },
- { SMCA_PIE, HWID_MCATYPE(0x2E, 0x1), 0x1F },
- { SMCA_CS_V2, HWID_MCATYPE(0x2E, 0x2), 0x3FFF },
+ { SMCA_CS, HWID_MCATYPE(0x2E, 0x0) },
+ { SMCA_PIE, HWID_MCATYPE(0x2E, 0x1) },
+ { SMCA_CS_V2, HWID_MCATYPE(0x2E, 0x2) },
/* Unified Memory Controller MCA type */
- { SMCA_UMC, HWID_MCATYPE(0x96, 0x0), 0xFF },
+ { SMCA_UMC, HWID_MCATYPE(0x96, 0x0) },
/* Parameter Block MCA type */
- { SMCA_PB, HWID_MCATYPE(0x05, 0x0), 0x1 },
+ { SMCA_PB, HWID_MCATYPE(0x05, 0x0) },
/* Platform Security Processor MCA type */
- { SMCA_PSP, HWID_MCATYPE(0xFF, 0x0), 0x1 },
- { SMCA_PSP_V2, HWID_MCATYPE(0xFF, 0x1), 0x3FFFF },
+ { SMCA_PSP, HWID_MCATYPE(0xFF, 0x0) },
+ { SMCA_PSP_V2, HWID_MCATYPE(0xFF, 0x1) },
/* System Management Unit MCA type */
- { SMCA_SMU, HWID_MCATYPE(0x01, 0x0), 0x1 },
- { SMCA_SMU_V2, HWID_MCATYPE(0x01, 0x1), 0x7FF },
+ { SMCA_SMU, HWID_MCATYPE(0x01, 0x0) },
+ { SMCA_SMU_V2, HWID_MCATYPE(0x01, 0x1) },
/* Microprocessor 5 Unit MCA type */
- { SMCA_MP5, HWID_MCATYPE(0x01, 0x2), 0x3FF },
+ { SMCA_MP5, HWID_MCATYPE(0x01, 0x2) },
/* Northbridge IO Unit MCA type */
- { SMCA_NBIO, HWID_MCATYPE(0x18, 0x0), 0x1F },
+ { SMCA_NBIO, HWID_MCATYPE(0x18, 0x0) },
/* PCI Express Unit MCA type */
- { SMCA_PCIE, HWID_MCATYPE(0x46, 0x0), 0x1F },
+ { SMCA_PCIE, HWID_MCATYPE(0x46, 0x0) },
};
struct smca_bank smca_banks[MAX_NR_BANKS];
diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c
index 4fd06a3dc6fe..7f28edb070bd 100644
--- a/drivers/edac/mce_amd.c
+++ b/drivers/edac/mce_amd.c
@@ -999,10 +999,8 @@ static void decode_smca_error(struct mce *m)
pr_emerg(HW_ERR "%s Ext. Error Code: %d", ip_name, xec);
/* Only print the decode of valid error codes */
- if (xec < smca_mce_descs[bank_type].num_descs &&
- (hwid->xec_bitmap & BIT_ULL(xec))) {
+ if (xec < smca_mce_descs[bank_type].num_descs)
pr_cont(", %s.\n", smca_mce_descs[bank_type].descs[xec]);
- }
if (bank_type == SMCA_UMC && xec == 0 && decode_dram_ecc)
decode_dram_ecc(cpu_to_node(m->extcpu), m);
--
2.25.1
On Mon, Jul 20, 2020 at 02:53:53PM +0000, Yazen Ghannam wrote:
> From: Yazen Ghannam <[email protected]>
>
> The Extended Error Code Bitmap (xec_bitmap) for a Scalable MCA bank type
> was intended to be used by the kernel to filter out invalid error codes
> on a system. However, this is unnecessary because the hardware will only
> report valid error codes.
That's a kinda bold statement. :)
Are you saying, you wanna trust verification and that check is totally
useless?
Or is there another reason for removing it?
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
On Mon, Aug 17, 2020 at 11:40:07AM +0200, Borislav Petkov wrote:
> On Mon, Jul 20, 2020 at 02:53:53PM +0000, Yazen Ghannam wrote:
> > From: Yazen Ghannam <[email protected]>
> >
> > The Extended Error Code Bitmap (xec_bitmap) for a Scalable MCA bank type
> > was intended to be used by the kernel to filter out invalid error codes
> > on a system. However, this is unnecessary because the hardware will only
> > report valid error codes.
>
> That's a kinda bold statement. :)
>
Yeah, I'm trying to keep "may" out of my vocabulary. :)
> Are you saying, you wanna trust verification and that check is totally
> useless?
>
I do. This check was added because I wasn't sure what to expect with
this new architecural extension. But after a few product releases, it
has been unnecessary. And I don't see a need for it with future systems.
Thanks,
Yazen
On Mon, Aug 17, 2020 at 10:18:21AM -0500, Yazen Ghannam wrote:
> Yeah, I'm trying to keep "may" out of my vocabulary. :)
Hahha, you never know with hardware :-)
> I do. This check was added because I wasn't sure what to expect with
> this new architecural extension. But after a few product releases, it
> has been unnecessary. And I don't see a need for it with future systems.
Ok, will add that to the commit message.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
The following commit has been merged into the ras/core branch of tip:
Commit-ID: 5f2c67bd0f8a470a12c38a8786c42c043e100014
Gitweb: https://git.kernel.org/tip/5f2c67bd0f8a470a12c38a8786c42c043e100014
Author: Yazen Ghannam <[email protected]>
AuthorDate: Mon, 20 Jul 2020 14:53:53
Committer: Borislav Petkov <[email protected]>
CommitterDate: Tue, 18 Aug 2020 12:15:43 +02:00
x86/MCE/AMD, EDAC/mce_amd: Remove struct smca_hwid.xec_bitmap
The Extended Error Code Bitmap (xec_bitmap) for a Scalable MCA bank type
was intended to be used by the kernel to filter out invalid error codes
on a system. However, this is unnecessary after a few product releases
because the hardware will only report valid error codes. Thus, there's
no need for it with future systems.
Remove the xec_bitmap field and all references to it.
Signed-off-by: Yazen Ghannam <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
---
arch/x86/include/asm/mce.h | 1 +-
arch/x86/kernel/cpu/mce/amd.c | 44 +++++++++++++++++-----------------
drivers/edac/mce_amd.c | 4 +---
3 files changed, 23 insertions(+), 26 deletions(-)
diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index cf50382..6adced6 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -328,7 +328,6 @@ enum smca_bank_types {
struct smca_hwid {
unsigned int bank_type; /* Use with smca_bank_types for easy indexing. */
u32 hwid_mcatype; /* (hwid,mcatype) tuple */
- u32 xec_bitmap; /* Bitmap of valid ExtErrorCodes; current max is 21. */
u8 count; /* Number of instances. */
};
diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 99be063..0c6b02d 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -132,49 +132,49 @@ static enum smca_bank_types smca_get_bank_type(unsigned int bank)
}
static struct smca_hwid smca_hwid_mcatypes[] = {
- /* { bank_type, hwid_mcatype, xec_bitmap } */
+ /* { bank_type, hwid_mcatype } */
/* Reserved type */
- { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0), 0x0 },
+ { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0) },
/* ZN Core (HWID=0xB0) MCA types */
- { SMCA_LS, HWID_MCATYPE(0xB0, 0x0), 0x1FFFFF },
- { SMCA_LS_V2, HWID_MCATYPE(0xB0, 0x10), 0xFFFFFF },
- { SMCA_IF, HWID_MCATYPE(0xB0, 0x1), 0x3FFF },
- { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2), 0xF },
- { SMCA_DE, HWID_MCATYPE(0xB0, 0x3), 0x1FF },
+ { SMCA_LS, HWID_MCATYPE(0xB0, 0x0) },
+ { SMCA_LS_V2, HWID_MCATYPE(0xB0, 0x10) },
+ { SMCA_IF, HWID_MCATYPE(0xB0, 0x1) },
+ { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2) },
+ { SMCA_DE, HWID_MCATYPE(0xB0, 0x3) },
/* HWID 0xB0 MCATYPE 0x4 is Reserved */
- { SMCA_EX, HWID_MCATYPE(0xB0, 0x5), 0xFFF },
- { SMCA_FP, HWID_MCATYPE(0xB0, 0x6), 0x7F },
- { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7), 0xFF },
+ { SMCA_EX, HWID_MCATYPE(0xB0, 0x5) },
+ { SMCA_FP, HWID_MCATYPE(0xB0, 0x6) },
+ { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7) },
/* Data Fabric MCA types */
- { SMCA_CS, HWID_MCATYPE(0x2E, 0x0), 0x1FF },
- { SMCA_PIE, HWID_MCATYPE(0x2E, 0x1), 0x1F },
- { SMCA_CS_V2, HWID_MCATYPE(0x2E, 0x2), 0x3FFF },
+ { SMCA_CS, HWID_MCATYPE(0x2E, 0x0) },
+ { SMCA_PIE, HWID_MCATYPE(0x2E, 0x1) },
+ { SMCA_CS_V2, HWID_MCATYPE(0x2E, 0x2) },
/* Unified Memory Controller MCA type */
- { SMCA_UMC, HWID_MCATYPE(0x96, 0x0), 0xFF },
+ { SMCA_UMC, HWID_MCATYPE(0x96, 0x0) },
/* Parameter Block MCA type */
- { SMCA_PB, HWID_MCATYPE(0x05, 0x0), 0x1 },
+ { SMCA_PB, HWID_MCATYPE(0x05, 0x0) },
/* Platform Security Processor MCA type */
- { SMCA_PSP, HWID_MCATYPE(0xFF, 0x0), 0x1 },
- { SMCA_PSP_V2, HWID_MCATYPE(0xFF, 0x1), 0x3FFFF },
+ { SMCA_PSP, HWID_MCATYPE(0xFF, 0x0) },
+ { SMCA_PSP_V2, HWID_MCATYPE(0xFF, 0x1) },
/* System Management Unit MCA type */
- { SMCA_SMU, HWID_MCATYPE(0x01, 0x0), 0x1 },
- { SMCA_SMU_V2, HWID_MCATYPE(0x01, 0x1), 0x7FF },
+ { SMCA_SMU, HWID_MCATYPE(0x01, 0x0) },
+ { SMCA_SMU_V2, HWID_MCATYPE(0x01, 0x1) },
/* Microprocessor 5 Unit MCA type */
- { SMCA_MP5, HWID_MCATYPE(0x01, 0x2), 0x3FF },
+ { SMCA_MP5, HWID_MCATYPE(0x01, 0x2) },
/* Northbridge IO Unit MCA type */
- { SMCA_NBIO, HWID_MCATYPE(0x18, 0x0), 0x1F },
+ { SMCA_NBIO, HWID_MCATYPE(0x18, 0x0) },
/* PCI Express Unit MCA type */
- { SMCA_PCIE, HWID_MCATYPE(0x46, 0x0), 0x1F },
+ { SMCA_PCIE, HWID_MCATYPE(0x46, 0x0) },
};
struct smca_bank smca_banks[MAX_NR_BANKS];
diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c
index 325aedf..d4168c4 100644
--- a/drivers/edac/mce_amd.c
+++ b/drivers/edac/mce_amd.c
@@ -990,10 +990,8 @@ static void decode_smca_error(struct mce *m)
pr_emerg(HW_ERR "%s Ext. Error Code: %d", ip_name, xec);
/* Only print the decode of valid error codes */
- if (xec < smca_mce_descs[bank_type].num_descs &&
- (hwid->xec_bitmap & BIT_ULL(xec))) {
+ if (xec < smca_mce_descs[bank_type].num_descs)
pr_cont(", %s.\n", smca_mce_descs[bank_type].descs[xec]);
- }
if (bank_type == SMCA_UMC && xec == 0 && decode_dram_ecc)
decode_dram_ecc(cpu_to_node(m->extcpu), m);
The following commit has been merged into the ras/core branch of tip:
Commit-ID: 368d1887200d68075c064a62a9aa191168cf1eed
Gitweb: https://git.kernel.org/tip/368d1887200d68075c064a62a9aa191168cf1eed
Author: Yazen Ghannam <[email protected]>
AuthorDate: Mon, 20 Jul 2020 14:53:53
Committer: Borislav Petkov <[email protected]>
CommitterDate: Thu, 20 Aug 2020 10:34:38 +02:00
x86/MCE/AMD, EDAC/mce_amd: Remove struct smca_hwid.xec_bitmap
The Extended Error Code Bitmap (xec_bitmap) for a Scalable MCA bank type
was intended to be used by the kernel to filter out invalid error codes
on a system. However, this is unnecessary after a few product releases
because the hardware will only report valid error codes. Thus, there's
no need for it with future systems.
Remove the xec_bitmap field and all references to it.
Signed-off-by: Yazen Ghannam <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
---
arch/x86/include/asm/mce.h | 1 +-
arch/x86/kernel/cpu/mce/amd.c | 44 +++++++++++++++++-----------------
drivers/edac/mce_amd.c | 4 +---
3 files changed, 23 insertions(+), 26 deletions(-)
diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index cf50382..6adced6 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -328,7 +328,6 @@ enum smca_bank_types {
struct smca_hwid {
unsigned int bank_type; /* Use with smca_bank_types for easy indexing. */
u32 hwid_mcatype; /* (hwid,mcatype) tuple */
- u32 xec_bitmap; /* Bitmap of valid ExtErrorCodes; current max is 21. */
u8 count; /* Number of instances. */
};
diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 99be063..0c6b02d 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -132,49 +132,49 @@ static enum smca_bank_types smca_get_bank_type(unsigned int bank)
}
static struct smca_hwid smca_hwid_mcatypes[] = {
- /* { bank_type, hwid_mcatype, xec_bitmap } */
+ /* { bank_type, hwid_mcatype } */
/* Reserved type */
- { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0), 0x0 },
+ { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0) },
/* ZN Core (HWID=0xB0) MCA types */
- { SMCA_LS, HWID_MCATYPE(0xB0, 0x0), 0x1FFFFF },
- { SMCA_LS_V2, HWID_MCATYPE(0xB0, 0x10), 0xFFFFFF },
- { SMCA_IF, HWID_MCATYPE(0xB0, 0x1), 0x3FFF },
- { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2), 0xF },
- { SMCA_DE, HWID_MCATYPE(0xB0, 0x3), 0x1FF },
+ { SMCA_LS, HWID_MCATYPE(0xB0, 0x0) },
+ { SMCA_LS_V2, HWID_MCATYPE(0xB0, 0x10) },
+ { SMCA_IF, HWID_MCATYPE(0xB0, 0x1) },
+ { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2) },
+ { SMCA_DE, HWID_MCATYPE(0xB0, 0x3) },
/* HWID 0xB0 MCATYPE 0x4 is Reserved */
- { SMCA_EX, HWID_MCATYPE(0xB0, 0x5), 0xFFF },
- { SMCA_FP, HWID_MCATYPE(0xB0, 0x6), 0x7F },
- { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7), 0xFF },
+ { SMCA_EX, HWID_MCATYPE(0xB0, 0x5) },
+ { SMCA_FP, HWID_MCATYPE(0xB0, 0x6) },
+ { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7) },
/* Data Fabric MCA types */
- { SMCA_CS, HWID_MCATYPE(0x2E, 0x0), 0x1FF },
- { SMCA_PIE, HWID_MCATYPE(0x2E, 0x1), 0x1F },
- { SMCA_CS_V2, HWID_MCATYPE(0x2E, 0x2), 0x3FFF },
+ { SMCA_CS, HWID_MCATYPE(0x2E, 0x0) },
+ { SMCA_PIE, HWID_MCATYPE(0x2E, 0x1) },
+ { SMCA_CS_V2, HWID_MCATYPE(0x2E, 0x2) },
/* Unified Memory Controller MCA type */
- { SMCA_UMC, HWID_MCATYPE(0x96, 0x0), 0xFF },
+ { SMCA_UMC, HWID_MCATYPE(0x96, 0x0) },
/* Parameter Block MCA type */
- { SMCA_PB, HWID_MCATYPE(0x05, 0x0), 0x1 },
+ { SMCA_PB, HWID_MCATYPE(0x05, 0x0) },
/* Platform Security Processor MCA type */
- { SMCA_PSP, HWID_MCATYPE(0xFF, 0x0), 0x1 },
- { SMCA_PSP_V2, HWID_MCATYPE(0xFF, 0x1), 0x3FFFF },
+ { SMCA_PSP, HWID_MCATYPE(0xFF, 0x0) },
+ { SMCA_PSP_V2, HWID_MCATYPE(0xFF, 0x1) },
/* System Management Unit MCA type */
- { SMCA_SMU, HWID_MCATYPE(0x01, 0x0), 0x1 },
- { SMCA_SMU_V2, HWID_MCATYPE(0x01, 0x1), 0x7FF },
+ { SMCA_SMU, HWID_MCATYPE(0x01, 0x0) },
+ { SMCA_SMU_V2, HWID_MCATYPE(0x01, 0x1) },
/* Microprocessor 5 Unit MCA type */
- { SMCA_MP5, HWID_MCATYPE(0x01, 0x2), 0x3FF },
+ { SMCA_MP5, HWID_MCATYPE(0x01, 0x2) },
/* Northbridge IO Unit MCA type */
- { SMCA_NBIO, HWID_MCATYPE(0x18, 0x0), 0x1F },
+ { SMCA_NBIO, HWID_MCATYPE(0x18, 0x0) },
/* PCI Express Unit MCA type */
- { SMCA_PCIE, HWID_MCATYPE(0x46, 0x0), 0x1F },
+ { SMCA_PCIE, HWID_MCATYPE(0x46, 0x0) },
};
struct smca_bank smca_banks[MAX_NR_BANKS];
diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c
index 325aedf..d4168c4 100644
--- a/drivers/edac/mce_amd.c
+++ b/drivers/edac/mce_amd.c
@@ -990,10 +990,8 @@ static void decode_smca_error(struct mce *m)
pr_emerg(HW_ERR "%s Ext. Error Code: %d", ip_name, xec);
/* Only print the decode of valid error codes */
- if (xec < smca_mce_descs[bank_type].num_descs &&
- (hwid->xec_bitmap & BIT_ULL(xec))) {
+ if (xec < smca_mce_descs[bank_type].num_descs)
pr_cont(", %s.\n", smca_mce_descs[bank_type].descs[xec]);
- }
if (bank_type == SMCA_UMC && xec == 0 && decode_dram_ecc)
decode_dram_ecc(cpu_to_node(m->extcpu), m);