[Bug 104694] [BAT] [SKL GUC only] igt@* - dmesg-warn: [drm:guc_read_update_log_buffer] *ERROR* no sub-buffer to capture logs | [drm:guc_check_log_buf_overflow] *ERROR* GuC log buffer overflow

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104694

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit bd724318b682587ad2f989ab8e0f7b3d4486ced5
Author: Michal Wajdeczko <michal.wajdeczko at intel.com>
Date:   Fri Jan 19 12:49:26 2018 +0000

    drm/i915/guc: Keep GuC log disabled by default

    It looks that GuC log functionality is not fully functional yet and
    causes issues when enabled by auto(-1) modparam on debug builds.
    For example, but not limited to:

    [   30.062893] ======================================================
    [   30.062894] WARNING: possible circular locking dependency detected
    [   30.062895] 4.15.0-rc8-CI-CI_DRM_3648+ #1 Tainted: G     U
    [   30.062896] ------------------------------------------------------
    [   30.062897] debugfs_test/1268 is trying to acquire lock:
    [   30.062898]  (&dev->struct_mutex){+.+.}, at: [<00000000e4213449>]
i915_mutex_lock_interruptible+0x47/0x130 [i915]
    [   30.062921]
                   but task is already holding lock:
    [   30.062921]  (&mm->mmap_sem){++++}, at: [<00000000dd7adc93>]
__do_page_fault+0x106/0x560
    [   30.062924]
                   which lock already depends on the new lock.

    References: 0ed87953532652 ("drm/i915/guc: Redefine guc_log_level modparam
values")
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104693
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104694
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104695
    Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
    Cc: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Jani Saarinen <jani.saarinen at intel.com>
    Cc: Tomi Sarvela <tomi.p.sarvela at intel.com>
    Cc: Marta Lofstedt <marta.lofstedt at intel.com>
    Cc: Michal Winiarski <michal.winiarski at intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20180119124926.29844-1-michal.wajdeczko@intel.com
    Reviewed-by: Michal Winiarski <michal.winiarski at intel.com>
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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