Re: [PATCH v5 00/33] drm/xe: Add structured SIGID error logging infrastructure

On Fri, Aug 14, 2026 at 07:17:26PM +0200, Michal Wajdeczko wrote:
> Today the driver reports faults with ad-hoc drm_err()/xe_gt_err()
> strings that have no stable shape. That is readable for a human, but it
> gives fleet tooling nothing durable to match on: the wording changes
> between releases, lines can be rate-limited or dropped under an error
> storm, and there is no consistent way to ask "which recognised fault
> just happened?".
> 
> Introduce a signature identifier (SIGID): a small, stable integer that
> names one recognised Xe fault situation and serves as the primary handle
> for triage. A SIGID maps, through published end-user documentation, to a
> description and a recommended action; the driver only has to emit the
> right SIGID next to the usual human-readable text.
> 
> Design decisions:
> 
>  - Software-emitted signatures only. This header enumerates just the
>    situations the driver detects and reports itself. Signatures that
>    originate in firmware or hardware are identified by those layers (via
>    their own records/counters) and are logged as received -- minting a
>    driver-side id for them would duplicate an id the reporting layer
>    already owns.
> 
>  - Flat catalogue, chosen per report site. Each site emits the single
>    most specific situation for that site, so a multi-layer failure
>    produces a chain of reports rather than one ambiguous classification
>    (e.g. a failed GT reset reports GT_TDR and then WEDGED). A site that
>    matches no defined situation keeps using ordinary xe_err() /
>    xe_gt_err() rather than forcing a wrong id.
> 
>  - Stable numbering. A single flat list numbered sequentially from 1, in
>    introduction order. Values are only ever appended, never renumbered
>    or reused.
> 
>  - Severity is decoupled from the SIGID and chosen at the call site via
>    xe_ras_log_fatal() / _recoverable() / _info(); the same situation can
>    be reported at different severities depending on the instance.
> 
>  - dmesg stays close to a normal xe error line by reusing xe_err() /
>    xe_gt_err() (and their Tile/GT decoration); the only stable,
>    machine-matchable token added is SIGID=<n>. dmesg is not an ABI --
>    the durable machine record is the CPER carrying the same SIGID (a
>    planned follow-up, left as a TODO).
> 
> Wire up a representative site for each software signature so the set is
> exercised rather than merely declared.
> 
> Signed-off-by: Mallesh Koujalagi <[email protected]>
> Signed-off-by: Rodrigo Vivi <[email protected]>
> Signed-off-by: Michal Wajdeczko <[email protected]>
> Cc: Thomas Hellström <[email protected]>
> Cc: Matthew Brost <[email protected]>
> Cc: Aravind Iddamsetty <[email protected]>
> Cc: Riana Tauro <[email protected]>
> Cc: Raag Jadav <[email protected]>
> Cc: Badal Nilawar <[email protected]>
> 
> v1: https://patchwork.freedesktop.org/series/171022/#rev1
> v2: https://patchwork.freedesktop.org/series/171022/#rev2
>     component/location dmesg decorations moved away from macros
>     HW component identifiers related to RAS/FW enum values
>     CORRECTED severity rendered as an error
>     more support for const pointers
>     log 'probe blocked' as INFO
>     fix kunit device setup
>     more tests
> v3: https://patchwork.freedesktop.org/series/171022/#rev3
>     fix typos, args list and to_dev() corner case (Sashiko)
>     use assoc macros in xe_any (Jani)
>     add xe_any kunit test suite (Michal)
>     add more xe_log test cases (Michal)
> v4: https://patchwork.freedesktop.org/series/171022/#rev4
>     more patches with SIGID usage (Michal)
>     support for printk index (Jani)
>     more macros and other fixes (Mallesh)
>     no recovery buckets (all)
> v5: new helper xe_log_err_info (Michal)
>     survivability changes (Riana)
>     report fault-response as info (Rodrigo/Daniele)

Thank you so much!

series pushed to drm-xe-next.

> 
> Mallesh Koujalagi (1):
>   drm/xe/log: Add structured SIGID error logging infrastructure
> 
> Michal Wajdeczko (32):
>   drm/xe: Introduce xe_any helpers
>   drm/xe/log: Introduce structured component/location identifiers
>   drm/xe/log: Add component/location decorations to dmesg
>   drm/xe/log: Add SIGID log helpers for severity
>   drm/xe/log: Add SIGID log helpers for location
>   drm/xe/log: Add SIGID log helpers for location & severity
>   drm/xe/log: Add SIGID log helpers for components
>   drm/xe/log: Add SIGID log helpers for component & severity
>   drm/xe/log: Add SIGID log helpers for errno-only
>   drm/xe/log: Index all SIGID printk messages
>   drm/xe/log: Add hardware error signatures
>   drm/xe/log: Extend components list with hardware items
>   drm/xe/ras: Check RAS and LOG component definitions
>   drm/xe/kunit: Setup driver data in the test device
>   drm/xe/tests: Add Kunit tests for xe_log
>   drm/xe/tests: Add kunit tests for xe_any
>   drm/xe: Report 'probe blocked' status using SIGID
>   drm/xe: Report all probe errors using SIGID
>   drm/xe/survivability: Report 'boot status' using SIGID
>   drm/xe/survivability: Report sysfs failure in one place
>   drm/xe/survivability: Report 'boot status' on sysfs failure
>   drm/xe/survivability: Report 'Boot Mode enabled' status using SIGID
>   drm/xe/survivability: Report 'Runtime Mode enabled' status using SIGID
>   drm/xe: Report 'device wedged' errors using SIGID
>   drm/xe/pcode: Report 'Mailbox failed' error using SIGID
>   drm/xe/pcode: Report 'timeout, retrying' error using SIGID
>   drm/xe/pcode: Report 'initialization timedout' error using SIGID
>   drm/xe/guc: Report 'GuC mmio' errors using SIGID
>   drm/xe/gt: Report 'reset failed' errors using SIGID
>   drm/xe/gt: Report 'Fault response' pagefault error using SIGID
>   drm/xe/gt: Report 'Queue full' pagefault error using SIGID
>   drm/xe/pci: Report 'cannot re-enable' error using SIGID
> 
>  Documentation/gpu/xe/index.rst              |   1 +
>  Documentation/gpu/xe/xe_sigid.rst           |  14 +
>  drivers/gpu/drm/xe/Makefile                 |   1 +
>  drivers/gpu/drm/xe/abi/xe_log_abi.h         | 199 +++++++
>  drivers/gpu/drm/xe/abi/xe_sigid_abi.h       | 172 ++++++
>  drivers/gpu/drm/xe/tests/Makefile           |   1 +
>  drivers/gpu/drm/xe/tests/xe_any_kunit.c     | 213 ++++++++
>  drivers/gpu/drm/xe/tests/xe_kunit_helpers.c |   4 +
>  drivers/gpu/drm/xe/tests/xe_log_kunit.c     | 553 ++++++++++++++++++++
>  drivers/gpu/drm/xe/xe_any.h                 | 137 +++++
>  drivers/gpu/drm/xe/xe_device.c              |  16 +-
>  drivers/gpu/drm/xe/xe_gt.c                  |   7 +-
>  drivers/gpu/drm/xe/xe_guc.c                 |  18 +-
>  drivers/gpu/drm/xe/xe_log.c                 | 235 +++++++++
>  drivers/gpu/drm/xe/xe_log.h                 | 194 +++++++
>  drivers/gpu/drm/xe/xe_pagefault.c           |   8 +-
>  drivers/gpu/drm/xe/xe_pci.c                 |  32 +-
>  drivers/gpu/drm/xe/xe_pci_error.c           |   7 +-
>  drivers/gpu/drm/xe/xe_pcode.c               |  14 +-
>  drivers/gpu/drm/xe/xe_ras.c                 |  11 +
>  drivers/gpu/drm/xe/xe_survivability_mode.c  |  85 +--
>  21 files changed, 1854 insertions(+), 68 deletions(-)
>  create mode 100644 Documentation/gpu/xe/xe_sigid.rst
>  create mode 100644 drivers/gpu/drm/xe/abi/xe_log_abi.h
>  create mode 100644 drivers/gpu/drm/xe/abi/xe_sigid_abi.h
>  create mode 100644 drivers/gpu/drm/xe/tests/xe_any_kunit.c
>  create mode 100644 drivers/gpu/drm/xe/tests/xe_log_kunit.c
>  create mode 100644 drivers/gpu/drm/xe/xe_any.h
>  create mode 100644 drivers/gpu/drm/xe/xe_log.c
>  create mode 100644 drivers/gpu/drm/xe/xe_log.h
> 
> -- 
> 2.47.1
>