[Bug 65495] [GM45] bsd ring reset fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65495

--- Comment #13 from lu hua <huax.lu at intel.com> ---
(In reply to comment #12)
> Created attachment 81830 [details] [review]
> fix media reset on gm45
> 
> Can you please test the attached patch? Seems to work better on some light
> testing here at least ...

Test with this patch.
output:
gem_quiescent_gpu:155 failed, ret=-1, errno=5
./ZZ_hangman: line 30:  3291 Aborted                 (core dumped)
$SOURCE_DIR/gem_exec_big
gpu hang correctly dectected

dmesg:
[   79.660881] [drm:i915_ring_stop_set], Stopping rings 0x0000000f
[   79.688312] [drm:i915_driver_open],
[   79.688328] [drm:intel_crtc_cursor_set], cursor off
[   79.688331] [drm:intel_crtc_set_config], [CRTC:3] [FB:37] #connectors=1 (x
y) (0 0)
[   79.688337] [drm:intel_modeset_stage_output_state], [CONNECTOR:5:LVDS-1] to
[CRTC:3]
[   79.688340] [drm:intel_crtc_cursor_set], cursor off
[   79.688342] [drm:intel_crtc_set_config], [CRTC:4] [NOFB]
[   79.688344] [drm:intel_modeset_stage_output_state], [CONNECTOR:5:LVDS-1] to
[CRTC:3]
[   79.688350] [drm:i915_driver_open],
[   83.703210] [drm:i915_hangcheck_elapsed] *ERROR* stuck on render ring
[   83.703276] [drm] capturing error event; look for more information in
/sys/class/drm/card0/error
[   83.704560] [drm:i915_error_work_func], resetting chip
[   83.704603] [drm] Simulated gpu hang, resetting stop_rings
[   83.704640] [drm:i915_reset] *ERROR* Failed to reset chip.
[   83.704680] [drm:i9xx_update_plane], Writing base 00046000 00000000 0 0 5120
[   83.777870] [drm:intel_crtc_cursor_set], cursor off
[   83.777875] [drm:intel_crtc_set_config], [CRTC:3] [FB:37] #connectors=1 (x
y) (0 0)
[   83.777882] [drm:intel_modeset_stage_output_state], [CONNECTOR:5:LVDS-1] to
[CRTC:3]
[   83.777885] [drm:intel_crtc_cursor_set], cursor off
[   83.777886] [drm:intel_crtc_set_config], [CRTC:4] [NOFB]
[   83.777888] [drm:intel_modeset_stage_output_state], [CONNECTOR:5:LVDS-1] to
[CRTC:3]
[   84.143386] [drm:i915_error_state_write], Resetting error state

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