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a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D This change introduces a new taint flag, bit 20 ('H'), to indicate when the kernel has identified recoverable hardware failures during runtime. The flag is documented in tainted-kernels.rst, defined in panic.h, added to the taint_flags array in panic.c, and supported in the kernel-chktaint debugging tool. Marking kernels that have encountered recoverable hardware errors helps correlate future issues with hardware events, improving diagnostics and support for affected systems Signed-off-by: Breno Leitao --- Documentation/admin-guide/tainted-kernels.rst | 7 ++++++- include/linux/panic.h | 3 ++- kernel/panic.c | 1 + tools/debugging/kernel-chktaint | 8 ++++++++ 4 files changed, 17 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/tainted-kernels.rst b/Documentation/= admin-guide/tainted-kernels.rst index a0cc017e44246..28185e9c0e039 100644 --- a/Documentation/admin-guide/tainted-kernels.rst +++ b/Documentation/admin-guide/tainted-kernels.rst @@ -102,7 +102,8 @@ Bit Log Number Reason that got the kernel tainted 17 _/T 131072 kernel was built with the struct randomization plugin 18 _/N 262144 an in-kernel test has been run 19 _/J 524288 userspace used a mutating debug operation in fwctl -=3D=3D=3D =3D=3D=3D =3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + 20 _/H 1048576 hardware recoverable failures identified +=3D=3D=3D =3D=3D=3D =3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =20 Note: The character ``_`` is representing a blank in this table to make re= ading easier. @@ -189,3 +190,7 @@ More detailed explanation for tainting 19) ``J`` if userpace opened /dev/fwctl/* and performed a FWTCL_RPC_DEBUG= _WRITE to use the devices debugging features. Device debugging features could cause the device to malfunction in undefined ways. + + 20) ``H`` if the kernel identified any recoverable hardware failure earli= er + during its operation. This helps to correlate possible future issues = to + the fact that the hardware got a recoverable error. diff --git a/include/linux/panic.h b/include/linux/panic.h index 4adc657669354..d8241a052d69a 100644 --- a/include/linux/panic.h +++ b/include/linux/panic.h @@ -73,7 +73,8 @@ static inline void set_arch_panic_timeout(int timeout, in= t arch_default_timeout) #define TAINT_RANDSTRUCT 17 #define TAINT_TEST 18 #define TAINT_FWCTL 19 -#define TAINT_FLAGS_COUNT 20 +#define TAINT_HW_ERROR_RECOVERED 20 +#define TAINT_FLAGS_COUNT 21 #define TAINT_FLAGS_MAX ((1UL << TAINT_FLAGS_COUNT) - 1) =20 struct taint_flag { diff --git a/kernel/panic.c b/kernel/panic.c index b0b9a8bf4560d..fd13baf5d94bc 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -540,6 +540,7 @@ const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = =3D { TAINT_FLAG(RANDSTRUCT, 'T', ' ', true), TAINT_FLAG(TEST, 'N', ' ', true), TAINT_FLAG(FWCTL, 'J', ' ', true), + TAINT_FLAG(HW_ERROR_RECOVERED, 'H', ' ', false), }; =20 #undef TAINT_FLAG diff --git a/tools/debugging/kernel-chktaint b/tools/debugging/kernel-chkta= int index e7da0909d0970..b2099155a820c 100755 --- a/tools/debugging/kernel-chktaint +++ b/tools/debugging/kernel-chktaint @@ -212,6 +212,14 @@ else echo " * fwctl's mutating debug interface was used (#19)" fi =20 +T=3D`expr $T / 2` +if [ `expr $T % 2` -eq 0 ]; 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a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D Update the GHES error processing logic to taint the kernel when a recoverable or corrected hardware error is detected. If the error severity is GHES_SEV_RECOVERABLE or GHES_SEV_CORRECTED, the TAINT_HW_ERROR_RECOVERED flag is set. This allows users and support tools to identify systems that have experienced hardware issues that were recovered at runtime, improving traceability and diagnostics. Signed-off-by: Breno Leitao --- drivers/acpi/apei/ghes.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index 3d44f926afe8e..f323cefe234b9 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -1102,13 +1102,16 @@ static int ghes_proc(struct ghes *ghes) { struct acpi_hest_generic_status *estatus =3D ghes->estatus; u64 buf_paddr; - int rc; + int rc, sev; =20 rc =3D ghes_read_estatus(ghes, estatus, &buf_paddr, FIX_APEI_GHES_IRQ); if (rc) goto out; =20 - if (ghes_severity(estatus->error_severity) >=3D GHES_SEV_PANIC) + sev =3D ghes_severity(estatus->error_severity); + if (sev =3D=3D GHES_SEV_RECOVERABLE || sev =3D=3D GHES_SEV_CORRECTED) + add_taint(TAINT_HW_ERROR_RECOVERED, LOCKDEP_STILL_OK); + else if (sev >=3D GHES_SEV_PANIC) __ghes_panic(ghes, estatus, buf_paddr, FIX_APEI_GHES_IRQ); =20 if (!ghes_estatus_cached(estatus)) { --=20 2.47.1