[RFC PATCH 0/2] drm/i915: Fix panic if nothing to promote after preempt on reset

[RFC PATCH 0/2] drm/i915: Fix panic if nothing to promote after preempt on reset

[Janusz Krzysztofik]

The issue can be reproduced by interrupting "default-bomb" subtest of
"gem_ringfill" IGT, at least on simulation environment which is slow.

Janusz Krzysztofik (2):
  drm/i915: Fix NULL pointer dereference in execlists' trace_ports()
  drm/i915: Fix panic if nothing to promote after preempt on reset

 drivers/gpu/drm/i915/gt/intel_lrc.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

-- 
2.21.0

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[RFC PATCH 1/2] drm/i915: Fix NULL pointer dereference in execlists' trace_ports()

[Janusz Krzysztofik]

If it ever happens trace_port() helper is called with NULL port 0,
kernel panic occurs.  Fix it.

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_lrc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index d9061d9348cb..aa138aaf8743 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -656,10 +656,10 @@ trace_ports(const struct intel_engine_execlists *execlists,
 
 	GEM_TRACE("%s: %s { %llx:%lld%s, %llx:%lld }\n",
 		  engine->name, msg,
-		  ports[0]->fence.context,
-		  ports[0]->fence.seqno,
-		  i915_request_completed(ports[0]) ? "!" :
-		  i915_request_started(ports[0]) ? "*" :
+		  ports[0] ? ports[0]->fence.context : 0,
+		  ports[0] ? ports[0]->fence.seqno : 0,
+		  ports[0] && i915_request_completed(ports[0]) ? "!" :
+		  ports[0] && i915_request_started(ports[0]) ? "*" :
 		  "",
 		  ports[1] ? ports[1]->fence.context : 0,
 		  ports[1] ? ports[1]->fence.seqno : 0);
-- 
2.21.0

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[RFC PATCH 2/2] drm/i915: Fix panic if nothing to promote after preempt on reset

[Janusz Krzysztofik]

Execlists state machine always falls through from PREEMPT to PROMOTE,
expecting pending to be valid.  Apparently it not always happens to be
the case, at least during reset.  Assuming this unexpected behavior
depends on hardware, fix the issue by introducing a conditional break.

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_lrc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index aa138aaf8743..1bba13ee1023 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -1408,6 +1408,9 @@ static void process_csb(struct intel_engine_cs *engine)
 			while (*execlists->active)
 				execlists_schedule_out(*execlists->active++);
 
+			if (reset_in_progress(execlists) &&
+			    !assert_pending_valid(execlists, "reset"))
+				break;
 			/* fallthrough */
 		case CSB_PROMOTE: /* switch pending to inflight */
 			GEM_BUG_ON(*execlists->active);
-- 
2.21.0

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Re: [RFC PATCH 2/2] drm/i915: Fix panic if nothing to promote after preempt on reset

[Chris Wilson]

Quoting Janusz Krzysztofik (2019-08-06 13:24:58)
> Execlists state machine always falls through from PREEMPT to PROMOTE,
> expecting pending to be valid.  Apparently it not always happens to be
> the case, at least during reset.  Assuming this unexpected behavior
> depends on hardware, fix the issue by introducing a conditional break.

Nak. Find the reason why the HW is not behaving as is specified.
-Chris
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✓ Fi.CI.BAT: success for drm/i915: Fix panic if nothing to promote after preempt on reset

[Patchwork]

== Series Details ==

Series: drm/i915: Fix panic if nothing to promote after preempt on reset
URL   : https://patchwork.freedesktop.org/series/64769/
State : success

== Summary ==

CI Bug Log - changes from CI_DRM_6639 -> Patchwork_13887
====================================================

Summary
-------

  **SUCCESS**

  No regressions found.

  External URL: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/

Known issues
------------

  Here are the changes found in Patchwork_13887 that come from known issues:

### IGT changes ###

#### Issues hit ####

  * igt@i915_selftest@live_sanitycheck:
    - fi-icl-u3:          [PASS][1] -> [DMESG-WARN][2] ([fdo#107724])
   [1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/fi-icl-u3/igt@i915_selftest@live_sanitycheck.html
   [2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/fi-icl-u3/igt@i915_selftest@live_sanitycheck.html

  
#### Possible fixes ####

  * igt@gem_exec_suspend@basic-s4-devices:
    - fi-blb-e6850:       [INCOMPLETE][3] ([fdo#107718]) -> [PASS][4]
   [3]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/fi-blb-e6850/igt@gem_exec_suspend@basic-s4-devices.html
   [4]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/fi-blb-e6850/igt@gem_exec_suspend@basic-s4-devices.html

  * igt@kms_busy@basic-flip-c:
    - fi-kbl-7500u:       [SKIP][5] ([fdo#109271] / [fdo#109278]) -> [PASS][6] +2 similar issues
   [5]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/fi-kbl-7500u/igt@kms_busy@basic-flip-c.html
   [6]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/fi-kbl-7500u/igt@kms_busy@basic-flip-c.html

  * igt@prime_vgem@basic-fence-flip:
    - fi-kbl-7500u:       [SKIP][7] ([fdo#109271]) -> [PASS][8] +23 similar issues
   [7]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/fi-kbl-7500u/igt@prime_vgem@basic-fence-flip.html
   [8]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/fi-kbl-7500u/igt@prime_vgem@basic-fence-flip.html

  * igt@vgem_basic@sysfs:
    - fi-icl-u3:          [DMESG-WARN][9] ([fdo#107724]) -> [PASS][10] +1 similar issue
   [9]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/fi-icl-u3/igt@vgem_basic@sysfs.html
   [10]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/fi-icl-u3/igt@vgem_basic@sysfs.html

  
  {name}: This element is suppressed. This means it is ignored when computing
          the status of the difference (SUCCESS, WARNING, or FAILURE).

  [fdo#107713]: https://bugs.freedesktop.org/show_bug.cgi?id=107713
  [fdo#107718]: https://bugs.freedesktop.org/show_bug.cgi?id=107718
  [fdo#107724]: https://bugs.freedesktop.org/show_bug.cgi?id=107724
  [fdo#109100]: https://bugs.freedesktop.org/show_bug.cgi?id=109100
  [fdo#109271]: https://bugs.freedesktop.org/show_bug.cgi?id=109271
  [fdo#109278]: https://bugs.freedesktop.org/show_bug.cgi?id=109278


Participating hosts (54 -> 45)
------------------------------

  Missing    (9): fi-kbl-soraka fi-ilk-m540 fi-byt-squawks fi-bsw-cyan fi-cfl-guc fi-pnv-d510 fi-icl-y fi-byt-clapper fi-bdw-samus 


Build changes
-------------

  * CI: CI-20190529 -> None
  * Linux: CI_DRM_6639 -> Patchwork_13887

  CI-20190529: 20190529
  CI_DRM_6639: 474a7391a134134b2ddba7c7e89fb3bfa7b5a068 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_5121: 242cb6f2149cb9699ba9b316e5f60b756260e829 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_13887: a4ba2a0d0b55ac84594122dd4ef8b1cdc3eb3626 @ git://anongit.freedesktop.org/gfx-ci/linux


== Linux commits ==

a4ba2a0d0b55 drm/i915: Fix panic if nothing to promote after preempt on reset
497a2b846aaa drm/i915: Fix NULL pointer dereference in execlists' trace_ports()

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/
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✗ Fi.CI.IGT: failure for drm/i915: Fix panic if nothing to promote after preempt on reset

[Patchwork]

== Series Details ==

Series: drm/i915: Fix panic if nothing to promote after preempt on reset
URL   : https://patchwork.freedesktop.org/series/64769/
State : failure

== Summary ==

CI Bug Log - changes from CI_DRM_6639_full -> Patchwork_13887_full
====================================================

Summary
-------

  **FAILURE**

  Serious unknown changes coming with Patchwork_13887_full absolutely need to be
  verified manually.
  
  If you think the reported changes have nothing to do with the changes
  introduced in Patchwork_13887_full, please notify your bug team to allow them
  to document this new failure mode, which will reduce false positives in CI.

  

Possible new issues
-------------------

  Here are the unknown changes that may have been introduced in Patchwork_13887_full:

### IGT changes ###

#### Possible regressions ####

  * igt@perf_pmu@busy-idle-no-semaphores-vcs0:
    - shard-kbl:          [PASS][1] -> [DMESG-WARN][2]
   [1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-kbl6/igt@perf_pmu@busy-idle-no-semaphores-vcs0.html
   [2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-kbl2/igt@perf_pmu@busy-idle-no-semaphores-vcs0.html

  * igt@runner@aborted:
    - shard-kbl:          NOTRUN -> [FAIL][3]
   [3]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-kbl2/igt@runner@aborted.html

  
Known issues
------------

  Here are the changes found in Patchwork_13887_full that come from known issues:

### IGT changes ###

#### Issues hit ####

  * igt@gem_tiled_swapping@non-threaded:
    - shard-glk:          [PASS][4] -> [DMESG-WARN][5] ([fdo#108686])
   [4]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-glk3/igt@gem_tiled_swapping@non-threaded.html
   [5]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-glk8/igt@gem_tiled_swapping@non-threaded.html

  * igt@i915_suspend@fence-restore-tiled2untiled:
    - shard-apl:          [PASS][6] -> [DMESG-WARN][7] ([fdo#108566]) +2 similar issues
   [6]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-apl8/igt@i915_suspend@fence-restore-tiled2untiled.html
   [7]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-apl3/igt@i915_suspend@fence-restore-tiled2untiled.html

  * igt@kms_flip@dpms-vs-vblank-race:
    - shard-glk:          [PASS][8] -> [FAIL][9] ([fdo#103060])
   [8]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-glk3/igt@kms_flip@dpms-vs-vblank-race.html
   [9]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-glk8/igt@kms_flip@dpms-vs-vblank-race.html

  * igt@kms_frontbuffer_tracking@fbc-suspend:
    - shard-kbl:          [PASS][10] -> [DMESG-WARN][11] ([fdo#108566]) +6 similar issues
   [10]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-kbl7/igt@kms_frontbuffer_tracking@fbc-suspend.html
   [11]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-kbl3/igt@kms_frontbuffer_tracking@fbc-suspend.html

  * igt@kms_frontbuffer_tracking@fbcpsr-1p-primscrn-shrfb-plflip-blt:
    - shard-iclb:         [PASS][12] -> [FAIL][13] ([fdo#103167]) +4 similar issues
   [12]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-iclb2/igt@kms_frontbuffer_tracking@fbcpsr-1p-primscrn-shrfb-plflip-blt.html
   [13]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-iclb7/igt@kms_frontbuffer_tracking@fbcpsr-1p-primscrn-shrfb-plflip-blt.html

  * igt@kms_plane@pixel-format-pipe-c-planes-source-clamping:
    - shard-iclb:         [PASS][14] -> [INCOMPLETE][15] ([fdo#107713] / [fdo#110036 ])
   [14]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-iclb1/igt@kms_plane@pixel-format-pipe-c-planes-source-clamping.html
   [15]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-iclb7/igt@kms_plane@pixel-format-pipe-c-planes-source-clamping.html

  * igt@kms_plane_multiple@atomic-pipe-c-tiling-y:
    - shard-skl:          [PASS][16] -> [DMESG-WARN][17] ([fdo#106885])
   [16]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-skl5/igt@kms_plane_multiple@atomic-pipe-c-tiling-y.html
   [17]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-skl7/igt@kms_plane_multiple@atomic-pipe-c-tiling-y.html

  * igt@kms_psr@psr2_sprite_plane_onoff:
    - shard-iclb:         [PASS][18] -> [SKIP][19] ([fdo#109441])
   [18]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-iclb2/igt@kms_psr@psr2_sprite_plane_onoff.html
   [19]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-iclb7/igt@kms_psr@psr2_sprite_plane_onoff.html

  * igt@kms_setmode@basic:
    - shard-apl:          [PASS][20] -> [FAIL][21] ([fdo#99912])
   [20]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-apl4/igt@kms_setmode@basic.html
   [21]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-apl7/igt@kms_setmode@basic.html

  
#### Possible fixes ####

  * igt@gem_exec_balancer@smoke:
    - shard-iclb:         [SKIP][22] ([fdo#110854]) -> [PASS][23]
   [22]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-iclb7/igt@gem_exec_balancer@smoke.html
   [23]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-iclb4/igt@gem_exec_balancer@smoke.html

  * igt@i915_suspend@sysfs-reader:
    - shard-apl:          [DMESG-WARN][24] ([fdo#108566]) -> [PASS][25] +4 similar issues
   [24]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-apl4/igt@i915_suspend@sysfs-reader.html
   [25]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-apl7/igt@i915_suspend@sysfs-reader.html

  * igt@kms_flip@flip-vs-dpms-off-vs-modeset:
    - shard-hsw:          [INCOMPLETE][26] ([fdo#103540]) -> [PASS][27]
   [26]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-hsw8/igt@kms_flip@flip-vs-dpms-off-vs-modeset.html
   [27]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-hsw4/igt@kms_flip@flip-vs-dpms-off-vs-modeset.html

  * igt@kms_flip@flip-vs-expired-vblank-interruptible:
    - shard-skl:          [FAIL][28] ([fdo#105363]) -> [PASS][29]
   [28]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-skl6/igt@kms_flip@flip-vs-expired-vblank-interruptible.html
   [29]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-skl4/igt@kms_flip@flip-vs-expired-vblank-interruptible.html

  * igt@kms_frontbuffer_tracking@fbc-1p-primscrn-indfb-msflip-blt:
    - shard-iclb:         [FAIL][30] ([fdo#103167]) -> [PASS][31] +1 similar issue
   [30]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-iclb2/igt@kms_frontbuffer_tracking@fbc-1p-primscrn-indfb-msflip-blt.html
   [31]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-iclb2/igt@kms_frontbuffer_tracking@fbc-1p-primscrn-indfb-msflip-blt.html

  * igt@kms_frontbuffer_tracking@psr-1p-primscrn-indfb-pgflip-blt:
    - shard-iclb:         [INCOMPLETE][32] ([fdo#106978] / [fdo#107713]) -> [PASS][33]
   [32]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-iclb7/igt@kms_frontbuffer_tracking@psr-1p-primscrn-indfb-pgflip-blt.html
   [33]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-iclb8/igt@kms_frontbuffer_tracking@psr-1p-primscrn-indfb-pgflip-blt.html

  * igt@kms_pipe_crc_basic@suspend-read-crc-pipe-b:
    - shard-kbl:          [INCOMPLETE][34] ([fdo#103665]) -> [PASS][35]
   [34]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-kbl3/igt@kms_pipe_crc_basic@suspend-read-crc-pipe-b.html
   [35]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-kbl7/igt@kms_pipe_crc_basic@suspend-read-crc-pipe-b.html

  * igt@kms_plane_lowres@pipe-a-tiling-y:
    - shard-iclb:         [FAIL][36] ([fdo#103166]) -> [PASS][37]
   [36]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-iclb1/igt@kms_plane_lowres@pipe-a-tiling-y.html
   [37]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-iclb8/igt@kms_plane_lowres@pipe-a-tiling-y.html

  * igt@kms_psr2_su@frontbuffer:
    - shard-iclb:         [SKIP][38] ([fdo#109642] / [fdo#111068]) -> [PASS][39]
   [38]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-iclb4/igt@kms_psr2_su@frontbuffer.html
   [39]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-iclb2/igt@kms_psr2_su@frontbuffer.html

  * igt@tools_test@tools_test:
    - shard-skl:          [SKIP][40] ([fdo#109271]) -> [PASS][41]
   [40]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6639/shard-skl2/igt@tools_test@tools_test.html
   [41]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/shard-skl5/igt@tools_test@tools_test.html

  
  [fdo#103060]: https://bugs.freedesktop.org/show_bug.cgi?id=103060
  [fdo#103166]: https://bugs.freedesktop.org/show_bug.cgi?id=103166
  [fdo#103167]: https://bugs.freedesktop.org/show_bug.cgi?id=103167
  [fdo#103540]: https://bugs.freedesktop.org/show_bug.cgi?id=103540
  [fdo#103665]: https://bugs.freedesktop.org/show_bug.cgi?id=103665
  [fdo#105363]: https://bugs.freedesktop.org/show_bug.cgi?id=105363
  [fdo#106885]: https://bugs.freedesktop.org/show_bug.cgi?id=106885
  [fdo#106978]: https://bugs.freedesktop.org/show_bug.cgi?id=106978
  [fdo#107713]: https://bugs.freedesktop.org/show_bug.cgi?id=107713
  [fdo#108566]: https://bugs.freedesktop.org/show_bug.cgi?id=108566
  [fdo#108686]: https://bugs.freedesktop.org/show_bug.cgi?id=108686
  [fdo#109271]: https://bugs.freedesktop.org/show_bug.cgi?id=109271
  [fdo#109441]: https://bugs.freedesktop.org/show_bug.cgi?id=109441
  [fdo#109642]: https://bugs.freedesktop.org/show_bug.cgi?id=109642
  [fdo#110036 ]: https://bugs.freedesktop.org/show_bug.cgi?id=110036 
  [fdo#110854]: https://bugs.freedesktop.org/show_bug.cgi?id=110854
  [fdo#111068]: https://bugs.freedesktop.org/show_bug.cgi?id=111068
  [fdo#99912]: https://bugs.freedesktop.org/show_bug.cgi?id=99912


Participating hosts (10 -> 10)
------------------------------

  No changes in participating hosts


Build changes
-------------

  * CI: CI-20190529 -> None
  * Linux: CI_DRM_6639 -> Patchwork_13887

  CI-20190529: 20190529
  CI_DRM_6639: 474a7391a134134b2ddba7c7e89fb3bfa7b5a068 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_5121: 242cb6f2149cb9699ba9b316e5f60b756260e829 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_13887: a4ba2a0d0b55ac84594122dd4ef8b1cdc3eb3626 @ git://anongit.freedesktop.org/gfx-ci/linux
  piglit_4509: fdc5a4ca11124ab8413c7988896eec4c97336694 @ git://anongit.freedesktop.org/piglit

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13887/
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