linux-kernel - [PATCH v4 0/3] Fix CPER issues related to UEFI 2.9A Errata

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Date: Thu, 20 Jun 2024 20:01:43 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: 
Cc: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Tony Luck <tony.luck@...el.com>,
	James Morse <james.morse@....com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Shiju Jose <shiju.jose@...wei.com>,
	linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-edac@...r.kernel.org,
	Ard Biesheuvel <ardb@...nel.org>,
	Len Brown <lenb@...nel.org>,
	linux-acpi@...r.kernel.org
Subject: [PATCH v4 0/3] Fix CPER issues related to UEFI 2.9A Errata

The UEFI 2.9A errata makes clear how ARM processor type encoding should
be done: it is meant to be equal to Generic processor, using a bitmask.

The current code assumes, for both generic and ARM processor types
that this is an integer, which is an incorrect assumption.

Fix it. While here, also fix a compilation issue when using W=1.

After the change, Kernel will properly decode receiving two errors at the same
message, as defined at UEFI spec:

[   75.282430] Memory failure: 0x5cdfd: recovery action for free buddy page: Recovered
[   94.973081] {2}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 1
[   94.973770] {2}[Hardware Error]: event severity: recoverable
[   94.974334] {2}[Hardware Error]:  Error 0, type: recoverable
[   94.974962] {2}[Hardware Error]:   section_type: ARM processor error
[   94.975586] {2}[Hardware Error]:   MIDR: 0x000000000000cd24
[   94.976202] {2}[Hardware Error]:   Multiprocessor Affinity Register (MPIDR): 0x000000000000ab12
[   94.977011] {2}[Hardware Error]:   error affinity level: 2
[   94.977593] {2}[Hardware Error]:   running state: 0x1
[   94.978135] {2}[Hardware Error]:   Power State Coordination Interface state: 4660
[   94.978884] {2}[Hardware Error]:   Error info structure 0:
[   94.979463] {2}[Hardware Error]:   num errors: 3
[   94.979971] {2}[Hardware Error]:    first error captured
[   94.980523] {2}[Hardware Error]:    propagated error captured
[   94.981110] {2}[Hardware Error]:    overflow occurred, error info is incomplete
[   94.981893] {2}[Hardware Error]:    error_type: 0x0006: cache error|TLB error
[   94.982606] {2}[Hardware Error]:    error_info: 0x000000000091000f
[   94.983249] {2}[Hardware Error]:     transaction type: Data Access
[   94.983891] {2}[Hardware Error]:     cache error, operation type: Data write
[   94.984559] {2}[Hardware Error]:     TLB error, operation type: Data write
[   94.985215] {2}[Hardware Error]:     cache level: 2
[   94.985749] {2}[Hardware Error]:     TLB level: 2
[   94.986277] {2}[Hardware Error]:     processor context not corrupted

And the error code is properly decoded according with table N.17 from UEFI 2.10
spec:

	[   94.981893] {2}[Hardware Error]:    error_type: 0x0006: cache error|TLB error

Mauro Carvalho Chehab (3):
  efi/cper: Adjust infopfx size to accept an extra space
  efi/cper: Add a new helper function to print bitmasks
  efi/cper: align ARM CPER type with UEFI 2.9A/2.10 specs

 drivers/acpi/apei/ghes.c        | 10 +++---
 drivers/firmware/efi/cper-arm.c | 48 ++++++++++++---------------
 drivers/firmware/efi/cper.c     | 59 +++++++++++++++++++++++++++++++++
 include/linux/cper.h            | 13 +++++---
 4 files changed, 94 insertions(+), 36 deletions(-)

-- 
2.45.2