[Bug 97088] New: [APL] [BAT] GuC firmware goes missing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97088

            Bug ID: 97088
           Summary: [APL] [BAT] GuC firmware goes missing
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: david.s.gordon at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Split off from

Bug 96526 - [APL] [BAT execlists] Sporadic - gem_exec_suspend basic-s4 GPU hang
after resume

One of the logs attached to that bug
(https://bugs.freedesktop.org/attachment.cgi?id=124911) shows the GuC firmware
disappearing between reboots.

Early in the log we have

Jul  5 16:56:27 BXTP5 kernel: [    1.689144] [drm:intel_guc_setup] GuC fw
status: path i915/bxt_guc_ver8_7.bin, fetch SUCCESS, load NONE

but 5 minutes later, on the next reboot cycle:

Jul  5 17:01:44 BXTP5 kernel: [    1.711802] i915 0000:00:02.0: Direct firmware
load for i915/bxt_guc_ver8_7.bin failed with error -2

The kernel logs for each cycle look generally similar, but the order of some
operations is not identical. In particular, the appearance of the MMC devices
can come before OR after the attempt to load the GuC firmware.

So this is really a completely different issue, related to the way that devices
are initialised asynchronously w.r.t one another. Hence, this bug report has
been opened to track it separately.

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