✗ CI.checkpatch: warning for drm/xe: improve hibernation on igpu

[Patchwork]

== Series Details ==

Series: drm/xe: improve hibernation on igpu
URL   : https://patchwork.freedesktop.org/series/140823/
State : warning

== 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
30ab6715fc09baee6cc14cb3c89ad8858688d474
+ cd /kernel
+ git config --global --add safe.directory /kernel
+ git log -n1
commit 89f3ae76755e4add1970ef28e86a84f6b58c314e
Author: Matthew Auld <matthew.auld at intel.com>
Date:   Fri Nov 1 17:01:57 2024 +0000

    drm/xe: improve hibernation on igpu
    
    The GGTT looks to be stored inside stolen memory on igpu which is not
    treated as normal RAM.  The core kernel skips this memory range when
    creating the hibernation image, therefore when coming back from
    hibernation the GGTT programming is lost. This seems to cause issues
    with broken resume where GuC FW fails to load:
    
    [drm] *ERROR* GT0: load failed: status = 0x400000A0, time = 10ms, freq = 1250MHz (req 1300MHz), done = -1
    [drm] *ERROR* GT0: load failed: status: Reset = 0, BootROM = 0x50, UKernel = 0x00, MIA = 0x00, Auth = 0x01
    [drm] *ERROR* GT0: firmware signature verification failed
    [drm] *ERROR* CRITICAL: Xe has declared device 0000:00:02.0 as wedged.
    
    Current GGTT users are kernel internal and tracked as pinned, so it
    should be possible to hook into the existing save/restore logic that we
    use for dgpu, where the actual evict is skipped but on restore we
    importantly restore the GGTT programming.  This has been confirmed to
    fix hibernation on at least ADL and MTL, though likely all igpu
    platforms are affected.
    
    This also means we have a hole in our testing, where the existing s4
    tests only really test the driver hooks, and don't go as far as actually
    rebooting and restoring from the hibernation image and in turn powering
    down RAM (and therefore losing the contents of stolen).
    
    v2 (Brost)
     - Remove extra newline and drop unnecessary parentheses.
    
    Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
    Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/3275
    Signed-off-by: Matthew Auld <matthew.auld at intel.com>
    Cc: Matthew Brost <matthew.brost at intel.com>
    Cc: <stable at vger.kernel.org> # v6.8+
    Reviewed-by: Matthew Brost <matthew.brost at intel.com>
+ /mt/dim checkpatch 878bc9ca125cf19dee53e7dc7f7a6b6a0f14d06e drm-intel
89f3ae76755e drm/xe: improve hibernation on igpu
-:12: WARNING:COMMIT_LOG_LONG_LINE: Prefer a maximum 75 chars per line (possible unwrapped commit description?)
#12: 
[drm] *ERROR* GT0: load failed: status = 0x400000A0, time = 10ms, freq = 1250MHz (req 1300MHz), done = -1

total: 0 errors, 1 warnings, 0 checks, 92 lines checked