[Intel-gfx] [PATCH] drm/i915/gt: Immediately check for ACK after submission

[Intel-gfx] [PATCH] drm/i915/gt: Immediately check for ACK after submission

[Chris Wilson]

In an extreme case this may reduce the ACK latency by handling the
immediate HW response from a ready engine. That reduction in latency
should not actually impact any submission latency since on the direct
submit path we try and clear any pending interrupts first. On the
indirect reprioritisation or timeslicing paths, latency is not the
primary concern as the HW is still executing and will remain so until we
are able to preempt it (i.e. no reduction in effective pipeline stalls).

Still this may help mitigate the loss of softirq, which is a huge
concern.

References: https://gitlab.freedesktop.org/drm/intel/-/issues/1874
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_lrc.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index de5be57ed6d2..df77ed2a0a53 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -2528,7 +2528,7 @@ gen8_csb_parse(const struct intel_engine_execlists *execlists, const u32 *csb)
 	return *csb & (GEN8_CTX_STATUS_IDLE_ACTIVE | GEN8_CTX_STATUS_PREEMPTED);
 }
 
-static void process_csb(struct intel_engine_cs *engine)
+static bool process_csb(struct intel_engine_cs *engine)
 {
 	struct intel_engine_execlists * const execlists = &engine->execlists;
 	const u32 * const buf = execlists->csb_status;
@@ -2557,7 +2557,7 @@ static void process_csb(struct intel_engine_cs *engine)
 	head = execlists->csb_head;
 	tail = READ_ONCE(*execlists->csb_write);
 	if (unlikely(head == tail))
-		return;
+		return false;
 
 	/*
 	 * Hopefully paired with a wmb() in HW!
@@ -2692,6 +2692,7 @@ static void process_csb(struct intel_engine_cs *engine)
 	 * invalidation before.
 	 */
 	invalidate_csb_entries(&buf[0], &buf[num_entries - 1]);
+	return true;
 }
 
 static void __execlists_submission_tasklet(struct intel_engine_cs *const engine)
@@ -3116,9 +3117,11 @@ static void execlists_submission_tasklet(unsigned long data)
 	if (!READ_ONCE(engine->execlists.pending[0]) || timeout) {
 		unsigned long flags;
 
-		spin_lock_irqsave(&engine->active.lock, flags);
-		__execlists_submission_tasklet(engine);
-		spin_unlock_irqrestore(&engine->active.lock, flags);
+		do {
+			spin_lock_irqsave(&engine->active.lock, flags);
+			__execlists_submission_tasklet(engine);
+			spin_unlock_irqrestore(&engine->active.lock, flags);
+		} while (process_csb(engine));
 
 		/* Recheck after serialising with direct-submission */
 		if (unlikely(timeout && preempt_timeout(engine)))
-- 
2.20.1

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[Intel-gfx] ✓ Fi.CI.BAT: success for drm/i915/gt: Immediately check for ACK after submission

[Patchwork]

== Series Details ==

Series: drm/i915/gt: Immediately check for ACK after submission
URL   : https://patchwork.freedesktop.org/series/77509/
State : success

== Summary ==

CI Bug Log - changes from CI_DRM_8517 -> Patchwork_17749
====================================================

Summary
-------

  **SUCCESS**

  No regressions found.

  External URL: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/index.html

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

  Here are the changes found in Patchwork_17749 that come from known issues:

### IGT changes ###

#### Warnings ####

  * igt@i915_pm_rpm@module-reload:
    - fi-kbl-x1275:       [FAIL][1] ([i915#62]) -> [SKIP][2] ([fdo#109271])
   [1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/fi-kbl-x1275/igt@i915_pm_rpm@module-reload.html
   [2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/fi-kbl-x1275/igt@i915_pm_rpm@module-reload.html

  
  [fdo#109271]: https://bugs.freedesktop.org/show_bug.cgi?id=109271
  [i915#62]: https://gitlab.freedesktop.org/drm/intel/issues/62


Participating hosts (46 -> 42)
------------------------------

  Additional (1): fi-kbl-7560u 
  Missing    (5): fi-hsw-4200u fi-byt-squawks fi-bsw-cyan fi-byt-clapper fi-bdw-samus 


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

  * Linux: CI_DRM_8517 -> Patchwork_17749

  CI-20190529: 20190529
  CI_DRM_8517: 7c5c05e694bf83e9d4ef64172ef6c9d55aa334a5 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_5666: dfa3b1fdc9813a48314a43faaacb7dacc06112d6 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_17749: a1e1029490c0d0c2f3770cfd4725a4192c27135f @ git://anongit.freedesktop.org/gfx-ci/linux


== Linux commits ==

a1e1029490c0 drm/i915/gt: Immediately check for ACK after submission

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/index.html
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
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[Intel-gfx] ✓ Fi.CI.IGT: success for drm/i915/gt: Immediately check for ACK after submission

[Patchwork]

== Series Details ==

Series: drm/i915/gt: Immediately check for ACK after submission
URL   : https://patchwork.freedesktop.org/series/77509/
State : success

== Summary ==

CI Bug Log - changes from CI_DRM_8517_full -> Patchwork_17749_full
====================================================

Summary
-------

  **SUCCESS**

  No regressions found.

  

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

  Here are the changes found in Patchwork_17749_full that come from known issues:

### IGT changes ###

#### Issues hit ####

  * igt@gem_ctx_persistence@legacy-engines-mixed-process@blt:
    - shard-skl:          [PASS][1] -> [FAIL][2] ([i915#1528])
   [1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-skl9/igt@gem_ctx_persistence@legacy-engines-mixed-process@blt.html
   [2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-skl9/igt@gem_ctx_persistence@legacy-engines-mixed-process@blt.html

  * igt@gem_softpin@noreloc-s3:
    - shard-kbl:          [PASS][3] -> [DMESG-WARN][4] ([i915#165] / [i915#180])
   [3]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-kbl6/igt@gem_softpin@noreloc-s3.html
   [4]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-kbl2/igt@gem_softpin@noreloc-s3.html

  * igt@gen9_exec_parse@allowed-all:
    - shard-apl:          [PASS][5] -> [DMESG-WARN][6] ([i915#1436] / [i915#716])
   [5]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-apl8/igt@gen9_exec_parse@allowed-all.html
   [6]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-apl3/igt@gen9_exec_parse@allowed-all.html

  * igt@i915_pm_dc@dc6-psr:
    - shard-iclb:         [PASS][7] -> [FAIL][8] ([i915#454])
   [7]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-iclb6/igt@i915_pm_dc@dc6-psr.html
   [8]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-iclb6/igt@i915_pm_dc@dc6-psr.html

  * igt@i915_suspend@debugfs-reader:
    - shard-kbl:          [PASS][9] -> [DMESG-WARN][10] ([i915#180])
   [9]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-kbl7/igt@i915_suspend@debugfs-reader.html
   [10]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-kbl4/igt@i915_suspend@debugfs-reader.html

  * igt@i915_suspend@fence-restore-tiled2untiled:
    - shard-apl:          [PASS][11] -> [DMESG-WARN][12] ([i915#180]) +3 similar issues
   [11]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-apl8/igt@i915_suspend@fence-restore-tiled2untiled.html
   [12]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-apl3/igt@i915_suspend@fence-restore-tiled2untiled.html

  * igt@kms_cursor_legacy@flip-vs-cursor-atomic-transitions-varying-size:
    - shard-skl:          [PASS][13] -> [FAIL][14] ([IGT#5])
   [13]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-skl8/igt@kms_cursor_legacy@flip-vs-cursor-atomic-transitions-varying-size.html
   [14]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-skl2/igt@kms_cursor_legacy@flip-vs-cursor-atomic-transitions-varying-size.html

  * igt@kms_dp_dsc@basic-dsc-enable-edp:
    - shard-iclb:         [PASS][15] -> [SKIP][16] ([fdo#109349])
   [15]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-iclb2/igt@kms_dp_dsc@basic-dsc-enable-edp.html
   [16]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-iclb5/igt@kms_dp_dsc@basic-dsc-enable-edp.html

  * igt@kms_draw_crc@draw-method-xrgb8888-mmap-gtt-untiled:
    - shard-kbl:          [PASS][17] -> [FAIL][18] ([i915#177] / [i915#52] / [i915#54] / [i915#93] / [i915#95])
   [17]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-kbl4/igt@kms_draw_crc@draw-method-xrgb8888-mmap-gtt-untiled.html
   [18]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-kbl1/igt@kms_draw_crc@draw-method-xrgb8888-mmap-gtt-untiled.html

  * igt@kms_fbcon_fbt@fbc-suspend:
    - shard-glk:          [PASS][19] -> [FAIL][20] ([i915#64])
   [19]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-glk5/igt@kms_fbcon_fbt@fbc-suspend.html
   [20]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-glk2/igt@kms_fbcon_fbt@fbc-suspend.html

  * igt@kms_pipe_crc_basic@hang-read-crc-pipe-a:
    - shard-kbl:          [PASS][21] -> [FAIL][22] ([i915#53] / [i915#93] / [i915#95])
   [21]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-kbl2/igt@kms_pipe_crc_basic@hang-read-crc-pipe-a.html
   [22]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-kbl6/igt@kms_pipe_crc_basic@hang-read-crc-pipe-a.html
    - shard-apl:          [PASS][23] -> [FAIL][24] ([i915#53] / [i915#95])
   [23]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-apl1/igt@kms_pipe_crc_basic@hang-read-crc-pipe-a.html
   [24]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-apl2/igt@kms_pipe_crc_basic@hang-read-crc-pipe-a.html

  * igt@kms_plane_alpha_blend@pipe-b-coverage-7efc:
    - shard-skl:          [PASS][25] -> [FAIL][26] ([fdo#108145] / [i915#265]) +2 similar issues
   [25]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-skl9/igt@kms_plane_alpha_blend@pipe-b-coverage-7efc.html
   [26]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-skl9/igt@kms_plane_alpha_blend@pipe-b-coverage-7efc.html

  * igt@kms_psr2_su@frontbuffer:
    - shard-iclb:         [PASS][27] -> [SKIP][28] ([fdo#109642] / [fdo#111068])
   [27]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-iclb2/igt@kms_psr2_su@frontbuffer.html
   [28]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-iclb5/igt@kms_psr2_su@frontbuffer.html

  * igt@kms_psr@psr2_primary_page_flip:
    - shard-iclb:         [PASS][29] -> [SKIP][30] ([fdo#109441]) +1 similar issue
   [29]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-iclb2/igt@kms_psr@psr2_primary_page_flip.html
   [30]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-iclb8/igt@kms_psr@psr2_primary_page_flip.html

  * igt@kms_setmode@basic:
    - shard-skl:          [PASS][31] -> [FAIL][32] ([i915#31])
   [31]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-skl8/igt@kms_setmode@basic.html
   [32]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-skl8/igt@kms_setmode@basic.html

  
#### Possible fixes ####

  * igt@kms_cursor_crc@pipe-a-cursor-64x21-random:
    - shard-skl:          [FAIL][33] ([i915#54]) -> [PASS][34]
   [33]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-skl2/igt@kms_cursor_crc@pipe-a-cursor-64x21-random.html
   [34]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-skl10/igt@kms_cursor_crc@pipe-a-cursor-64x21-random.html

  * igt@kms_cursor_legacy@flip-vs-cursor-atomic:
    - shard-skl:          [FAIL][35] ([IGT#5]) -> [PASS][36]
   [35]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-skl2/igt@kms_cursor_legacy@flip-vs-cursor-atomic.html
   [36]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-skl10/igt@kms_cursor_legacy@flip-vs-cursor-atomic.html

  * igt@kms_hdr@bpc-switch-suspend:
    - shard-skl:          [FAIL][37] ([i915#1188]) -> [PASS][38] +1 similar issue
   [37]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-skl7/igt@kms_hdr@bpc-switch-suspend.html
   [38]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-skl8/igt@kms_hdr@bpc-switch-suspend.html

  * igt@kms_pipe_crc_basic@suspend-read-crc-pipe-a:
    - shard-kbl:          [DMESG-WARN][39] ([i915#180]) -> [PASS][40] +7 similar issues
   [39]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-kbl2/igt@kms_pipe_crc_basic@suspend-read-crc-pipe-a.html
   [40]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-kbl7/igt@kms_pipe_crc_basic@suspend-read-crc-pipe-a.html

  * igt@kms_plane_alpha_blend@pipe-c-constant-alpha-min:
    - shard-skl:          [FAIL][41] ([fdo#108145] / [i915#265]) -> [PASS][42] +1 similar issue
   [41]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-skl7/igt@kms_plane_alpha_blend@pipe-c-constant-alpha-min.html
   [42]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-skl8/igt@kms_plane_alpha_blend@pipe-c-constant-alpha-min.html

  * igt@kms_psr@no_drrs:
    - shard-iclb:         [FAIL][43] ([i915#173]) -> [PASS][44]
   [43]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-iclb1/igt@kms_psr@no_drrs.html
   [44]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-iclb2/igt@kms_psr@no_drrs.html

  * igt@kms_psr@psr2_sprite_plane_move:
    - shard-iclb:         [SKIP][45] ([fdo#109441]) -> [PASS][46] +2 similar issues
   [45]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-iclb8/igt@kms_psr@psr2_sprite_plane_move.html
   [46]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-iclb2/igt@kms_psr@psr2_sprite_plane_move.html

  * igt@kms_vblank@pipe-a-ts-continuation-suspend:
    - shard-apl:          [DMESG-WARN][47] ([i915#180]) -> [PASS][48] +6 similar issues
   [47]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-apl3/igt@kms_vblank@pipe-a-ts-continuation-suspend.html
   [48]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-apl7/igt@kms_vblank@pipe-a-ts-continuation-suspend.html

  
#### Warnings ####

  * igt@i915_pm_dc@dc3co-vpb-simulation:
    - shard-snb:          [SKIP][49] ([fdo#109271]) -> [INCOMPLETE][50] ([i915#82])
   [49]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-snb2/igt@i915_pm_dc@dc3co-vpb-simulation.html
   [50]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-snb1/igt@i915_pm_dc@dc3co-vpb-simulation.html

  * igt@i915_pm_dc@dc6-psr:
    - shard-tglb:         [FAIL][51] ([i915#454]) -> [SKIP][52] ([i915#468])
   [51]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-tglb1/igt@i915_pm_dc@dc6-psr.html
   [52]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-tglb2/igt@i915_pm_dc@dc6-psr.html

  * igt@kms_content_protection@lic:
    - shard-apl:          [TIMEOUT][53] ([i915#1319]) -> [FAIL][54] ([fdo#110321])
   [53]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-apl8/igt@kms_content_protection@lic.html
   [54]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-apl3/igt@kms_content_protection@lic.html

  * igt@kms_content_protection@srm:
    - shard-apl:          [TIMEOUT][55] ([i915#1319]) -> [FAIL][56] ([fdo#110321] / [i915#95])
   [55]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8517/shard-apl4/igt@kms_content_protection@srm.html
   [56]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17749/shard-apl4/igt@kms_content_protection@srm.html

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

  [IGT#5]: https://gitlab.freedesktop.org/drm/igt-gpu-tools/issues/5
  [fdo#108145]: https://bugs.freedesktop.org/show_bug.cgi?id=108145
  [fdo#109271]: https://bugs.freedesktop.org/show_bug.cgi?id=109271
  [fdo#109349]: https://bugs.freedesktop.org/show_bug.cgi?id=109349
  [fdo#109441]: https://bugs.freedesktop.org/show_bug.cgi?id=109441
  [fdo#109642]: https://bugs.freedesktop.org/show_bug.cgi?id=109642
  [fdo#110321]: https://bugs.freedesktop.org/show_bug.cgi?id=110321
  [fdo#111068]: https://bugs.freedesktop.org/show_bug.cgi?id=111068
  [i915#1188]: https://gitlab.freedesktop.org/drm/intel/issues/1188
  [i915#1319]: https://gitlab.freedesktop.org/drm/intel/issues/1319
  [i915#1436]: https://gitlab.freedesktop.org/drm/intel/issues/1436
  [i915#1528]: https://gitlab.freedesktop.org/drm/intel/issues/1528
  [i915#165]: https://gitlab.freedesktop.org/drm/intel/issues/165
  [i915#173]: https://gitlab.freedesktop.org/drm/intel/issues/173
  [i915#177]: https://gitlab.freedesktop.org/drm/intel/issues/177
  [i915#180]: https://gitlab.freedesktop.org/drm/intel/issues/180
  [i915#265]: https://gitlab.freedesktop.org/drm/intel/issues/265
  [i915#31]: https://gitlab.freedesktop.org/drm/intel/issues/31
  [i915#454]: https://gitlab.freedesktop.org/drm/intel/issues/454
  [i915#468]: https://gitlab.freedesktop.org/drm/intel/issues/468
  [i915#52]: https://gitlab.freedesktop.org/drm/intel/issues/52
  [i915#53]: https://gitlab.freedesktop.org/drm/intel/issues/53
  [i915#54]: https://gitlab.freedesktop.org/drm/intel/issues/54
  [i915#64]: https://gitlab.freedesktop.org/drm/intel/issues/64
  [i915#716]: https://gitlab.freedesktop.org/drm/intel/issues/716
  [i915#82]: https://gitlab.freedesktop.org/drm/intel/issues/82
  [i915#93]: https://gitlab.freedesktop.org/drm/intel/issues/93
  [i915#95]: https://gitlab.freedesktop.org/drm/intel/issues/95


Participating hosts (11 -> 11)
------------------------------

  No changes in participating hosts


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

  * Linux: CI_DRM_8517 -> Patchwork_17749

  CI-20190529: 20190529
  CI_DRM_8517: 7c5c05e694bf83e9d4ef64172ef6c9d55aa334a5 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_5666: dfa3b1fdc9813a48314a43faaacb7dacc06112d6 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_17749: a1e1029490c0d0c2f3770cfd4725a4192c27135f @ 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_17749/index.html
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
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