[Intel-xe] ✓ CI.checkpatch: success for drm/xe/guc: Use FAST_REQUEST for non-blocking H2G messages

[Patchwork]

== Series Details ==

Series: drm/xe/guc: Use FAST_REQUEST for non-blocking H2G messages
URL   : https://patchwork.freedesktop.org/series/126495/
State : success

== Summary ==

+ KERNEL=/kernel
+ git clone https://gitlab.freedesktop.org/drm/maintainer-tools mt
Cloning into 'mt'...
warning: redirecting to https://gitlab.freedesktop.org/drm/maintainer-tools.git/
+ git -C mt rev-list -n1 origin/master
63c2b6b160bca2df6efc7bc4cea6f442097d7854
+ cd /kernel
+ git config --global --add safe.directory /kernel
+ git log -n1
commit 0ec1bfefa7ff355ad708713e404c19da3d4fbe49
Author: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Date:   Wed Nov 15 15:40:43 2023 -0800

    drm/xe/guc: Use FAST_REQUEST for non-blocking H2G messages
    
    We're currently sending non-blocking H2G messages using the EVENT type,
    which suppresses all CTB protocol replies from the GuC, including the
    failure cases. This might cause errors to slip through and manifest as
    unexpected behavior (e.g. a context state might not be what the driver
    thinks it is because the state change command was silently rejected by
    the GuC). To avoid this kind of problems, we can use the FAST_REQUEST
    type instead, which suppresses the reply only on success; this way we
    still get the advantage of not having to wait for an ack from the GuC
    (i.e. the H2G is still non-blocking) while still detecting errors.
    Since we don't track the non-blocking messages, we don't exactly know
    which one of them failed and therefore can't attempt to recover and need
    to escalate to GT reset instead.
    
    Note that FAST_REQUEST failures are NOT expected and are usually a sign
    that the H2G was either malformed or requested an illegal operation.
    
    Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
    Cc: John Harrison <John.C.Harrison at Intel.com>
    Cc: Matthew Brost <matthew.brost at intel.com>
    Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
+ /mt/dim checkpatch eba8bfb1dc87535362e28de282addc8752204df4 drm-intel
0ec1bfefa drm/xe/guc: Use FAST_REQUEST for non-blocking H2G messages