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Jason Tian 22b5096abc RAS: Report all ARM processor CPER information to userspace [ Upstream commit `05954511b7` ] The ARM processor CPER record was added in UEFI v2.6 and remained unchanged up to v2.10. Yet, the original arm_event trace code added by `e9279e83ad` ("trace, ras: add ARM processor error trace event") is incomplete, as it only traces some fields of UAPI 2.6 table N.16, not exporting any information from tables N.17 to N.29 of the record. This is not enough for the user to be able to figure out what has exactly happened or to take appropriate action. According to the UEFI v2.9 specification chapter N2.4.4, the ARM processor error section includes: - several (ERR_INFO_NUM) ARM processor error information structures (Tables N.17 to N.20); - several (CONTEXT_INFO_NUM) ARM processor context information structures (Tables N.21 to N.29); - several vendor specific error information structures. The size is given by Section Length minus the size of the other fields. In addition, it also exports two fields that are parsed by the GHES driver when firmware reports it, e.g.: - error severity - CPU logical index Report all of these information to userspace via a the ARM tracepoint so that userspace can properly record the error and take decisions related to CPU core isolation according to error severity and other info. The updated ARM trace event now contains the following fields: ====================================== ============================= UEFI field on table N.16 ARM Processor trace fields ====================================== ============================= Validation handled when filling data for affinity MPIDR and running state. ERR_INFO_NUM pei_len CONTEXT_INFO_NUM ctx_len Section Length indirectly reported by pei_len, ctx_len and oem_len Error affinity level affinity MPIDR_EL1 mpidr MIDR_EL1 midr Running State running_state PSCI State psci_state Processor Error Information Structure pei_err - count at pei_len Processor Context ctx_err- count at ctx_len Vendor Specific Error Info oem - count at oem_len ====================================== ============================= It should be noted that decoding of tables N.17 to N.29, if needed, will be handled in userspace. That gives more flexibility, as there won't be any need to flood the kernel with micro-architecture specific error decoding. Also, decoding the other fields require a complex logic, and should be done for each of the several values inside the record field. So, let userspace daemons like rasdaemon decode them, parsing such tables and having vendor-specific micro-architecture-specific decoders. [mchehab: modified description, solved merge conflicts and fixed coding style] Signed-off-by: Jason Tian <jason@os.amperecomputing.com> Co-developed-by: Shengwei Luo <luoshengwei@huawei.com> Signed-off-by: Shengwei Luo <luoshengwei@huawei.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Daniel Ferguson <danielf@os.amperecomputing.com> # rebased Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Tested-by: Shiju Jose <shiju.jose@huawei.com> Acked-by: Borislav Petkov (AMD) <bp@alien8.de> Fixes: `e9279e83ad` ("trace, ras: add ARM processor error trace event") Link: https://uefi.org/specs/UEFI/2.10/Apx_N_Common_Platform_Error_Record.html#arm-processor-error-section Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-12-18 14:03:09 +01:00
arch	powerpc/64s/ptdump: Fix kernel_hash_pagetable dump for ISA v3.00 HPTE format	2025-12-18 14:03:04 +01:00
block	block/blk-throttle: Fix throttle slice time for SSDs	2025-12-18 14:03:03 +01:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id	2025-12-18 14:02:35 +01:00
Documentation	dt-bindings: PCI: amlogic: Fix the register name of the DBI region	2025-12-18 14:02:54 +01:00
drivers	RAS: Report all ARM processor CPER information to userspace	2025-12-18 14:03:09 +01:00
fs	fs/ntfs3: Prevent memory leaks in add sub record	2025-12-18 14:03:05 +01:00
include	RAS: Report all ARM processor CPER information to userspace	2025-12-18 14:03:09 +01:00
init	printk changes for 6.18	2025-10-04 11:13:11 -07:00
io_uring	io_uring/zcrx: call netdev_queue_get_dma_dev() under instance lock	2025-12-18 14:02:56 +01:00
ipc	namespace-6.18-rc1	2025-09-29 11:20:29 -07:00
kernel	cpuset: Treat cpusets in attaching as populated	2025-12-18 14:03:09 +01:00
lib	lib/vsprintf: Check pointer before dereferencing in time_and_date()	2025-12-18 14:02:58 +01:00
LICENSES	LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2	2025-07-24 11:15:39 +02:00
mm	8 hotfixes. 4 are cc:stable, 7 are against mm/.	2025-11-26 12:38:05 -08:00
net	wifi: mac80211: fix CMAC functions not handling errors	2025-12-18 14:03:06 +01:00
rust	rust: Add -fno-isolate-erroneous-paths-dereference to bindgen_skip_c_flags	2025-11-10 08:37:06 +08:00
samples	samples: work around glibc redefining some of our defines wrong	2025-11-21 09:29:02 -08:00
scripts	kbuild: don't enable CC_CAN_LINK if the dummy program generates warnings	2025-12-18 14:03:01 +01:00
security	ima: Attach CREDS_CHECK IMA hook to bprm_creds_from_file LSM hook	2025-12-18 14:02:27 +01:00
sound	ASoC: SDCA: Fix missing dash in HIDE DisCo property	2025-12-18 14:03:09 +01:00
tools	selftests/bpf: Use ASSERT_STRNEQ to factor in long slab cache names	2025-12-18 14:03:09 +01:00
usr	gen_init_cpio: Ignore fsync() returning EINVAL on pipes	2025-10-07 09:53:05 -07:00
virt	KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying	2025-11-04 09:16:53 -08:00
.clang-format	memblock: drop for_each_free_mem_pfn_range_in_zone_from()	2025-09-14 08:49:03 +03:00
.clippy.toml	rust: clean Rust 1.88.0's warning about `clippy::disallowed_macros` configuration	2025-05-07 00:11:47 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.editorconfig	.editorconfig: remove trim_trailing_whitespace option	2024-06-13 16:47:52 +02:00
.get_maintainer.ignore	MAINTAINERS: remove Alyssa Rosenzweig	2025-09-18 21:17:31 +02:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	.gitignore: ignore compile_commands.json globally	2025-08-12 15:53:55 -07:00
.mailmap	8 hotfixes. 4 are cc:stable, 7 are against mm/.	2025-11-26 12:38:05 -08:00
.pylintrc	tools: docs: parse-headers.py: move it from sphinx dir	2025-08-29 15:54:42 -06:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: mark ISDN subsystem as orphan	2025-10-27 17:49:45 -07:00
Kbuild	sched: Make migrate_{en,dis}able() inline	2025-09-25 09:57:16 +02:00
Kconfig	io_uring: Rename KConfig to Kconfig	2025-02-19 14:53:27 -07:00
MAINTAINERS	soc: fixes for 6.18, part 4	2025-11-28 09:57:31 -08:00
Makefile	Linux 6.18.1	2025-12-12 18:42:47 +01:00
README	README: Fix spelling	2024-03-18 03:36:32 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.