Re: Regression of v4.6-rc vs. v4.5 bisected: a98ee79317b4 "drm/i915/fbc: enable FBC by default on HSW and BDW"

[Stefan Richter]

On May 06 Daniel Vetter wrote:
> On Thu, May 05, 2016 at 10:45:31PM +0200, Stefan Richter wrote:
[...]
> > Subtest fbc-1p-primscrn-spr-indfb-fullscreen: FAIL (5.876s)  
> 
> This one failed in both runs. Can you please retest with just that using
> 
> # kms_frontbuffer_tracking --run-subtest fbc-1p-primscrn-spr-indfb-fullscreen
> 
> Also please boot with drm.debug=0xe and grab the full dmesg of just that
> single subtest. There's definitely something going wrong here.

I performed this test with
  - plain v4.6-rc6,
  - v4.6-rc6 patched with drm-intel-nightly (2016y-05m-06d-14h-29m-58s).

On v4.6-rc6, the test failed thus:

-------- 8< --------
Subtest fbc-1p-primscrn-spr-indfb-fullscreen failed.
**** DEBUG ****
(kms_frontbuffer_tracking:1914) DEBUG: Test requirement passed: fbc.can_test
(kms_frontbuffer_tracking:1914) drmtest-DEBUG: Test requirement passed: is_i915_device(fd) && has_known_intel_chipset(fd)
(kms_frontbuffer_tracking:1914) igt-fb-DEBUG: igt_create_fb_with_bo_size(width=2560, height=1440, format=0x34325258, tiling=0x100000000000001, size=14745600)
(kms_frontbuffer_tracking:1914) drmtest-DEBUG: Test requirement passed: is_i915_device(fd) && has_known_intel_chipset(fd)
(kms_frontbuffer_tracking:1914) drmtest-DEBUG: Test requirement passed: is_i915_device(fd) && has_known_intel_chipset(fd)
(kms_frontbuffer_tracking:1914) igt-fb-DEBUG: igt_create_fb_with_bo_size(handle=6, pitch=10240)
(kms_frontbuffer_tracking:1914) DEBUG: Blue CRC:   pipe:[2ca73d01 00000000 00000000 00000000 00000000] sink:[unsupported!]
(kms_frontbuffer_tracking:1914) drmtest-DEBUG: Test requirement passed: is_i915_device(fd) && has_known_intel_chipset(fd)
(kms_frontbuffer_tracking:1914) igt-fb-DEBUG: igt_create_fb_with_bo_size(width=2560, height=1440, format=0x34325258, tiling=0x100000000000001, size=14745600)
(kms_frontbuffer_tracking:1914) drmtest-DEBUG: Test requirement passed: is_i915_device(fd) && has_known_intel_chipset(fd)
(kms_frontbuffer_tracking:1914) drmtest-DEBUG: Test requirement passed: is_i915_device(fd) && has_known_intel_chipset(fd)
(kms_frontbuffer_tracking:1914) igt-fb-DEBUG: igt_create_fb_with_bo_size(handle=6, pitch=10240)
(kms_frontbuffer_tracking:1914) igt-draw-DEBUG: Test requirement passed: intel_gen(intel_get_drm_devid(fd)) >= 5
(kms_frontbuffer_tracking:1914) DEBUG: Rect 0 CRC: pipe:[febb8b20 00000000 00000000 00000000 00000000] sink:[unsupported!]
(kms_frontbuffer_tracking:1914) igt-draw-DEBUG: Test requirement passed: intel_gen(intel_get_drm_devid(fd)) >= 5
(kms_frontbuffer_tracking:1914) DEBUG: Calculated CRC: pipe:[2ca73d01 00000000 00000000 00000000 00000000] sink:[unsupported!]
(kms_frontbuffer_tracking:1914) DEBUG: Test requirement passed: !fbc_not_enough_stolen()
(kms_frontbuffer_tracking:1914) DEBUG: Calculated CRC: pipe:[2ca73d01 00000000 00000000 00000000 00000000] sink:[unsupported!]
(kms_frontbuffer_tracking:1914) igt-draw-DEBUG: Test requirement passed: intel_gen(intel_get_drm_devid(fd)) >= 5
(kms_frontbuffer_tracking:1914) DEBUG: Calculated CRC: pipe:[2ca73d01 00000000 00000000 00000000 00000000] sink:[unsupported!]
(kms_frontbuffer_tracking:1914) DEBUG: Test requirement passed: !fbc_not_enough_stolen()
(kms_frontbuffer_tracking:1914) DEBUG: Calculated CRC: pipe:[2ca73d01 00000000 00000000 00000000 00000000] sink:[unsupported!]
(kms_frontbuffer_tracking:1914) drmtest-DEBUG: Test requirement passed: is_i915_device(fd) && has_known_intel_chipset(fd)
(kms_frontbuffer_tracking:1914) igt-fb-DEBUG: igt_create_fb_with_bo_size(width=2560, height=1440, format=0x34325258, tiling=0x100000000000001, size=14745600)
(kms_frontbuffer_tracking:1914) drmtest-DEBUG: Test requirement passed: is_i915_device(fd) && has_known_intel_chipset(fd)
(kms_frontbuffer_tracking:1914) drmtest-DEBUG: Test requirement passed: is_i915_device(fd) && has_known_intel_chipset(fd)
(kms_frontbuffer_tracking:1914) igt-fb-DEBUG: igt_create_fb_with_bo_size(handle=6, pitch=10240)
(kms_frontbuffer_tracking:1914) DEBUG: Calculated CRC: pipe:[febb8b20 00000000 00000000 00000000 00000000] sink:[unsupported!]
(kms_frontbuffer_tracking:1914) DEBUG: Test requirement passed: !fbc_not_enough_stolen()
(kms_frontbuffer_tracking:1914) DEBUG: Calculated CRC: pipe:[febb8b20 00000000 00000000 00000000 00000000] sink:[unsupported!]
(kms_frontbuffer_tracking:1914) igt-core-INFO: Timed out: CRC reading
****  END  ****
IGT-Version: 1.14-gc03a8ae6bf2f (x86_64) (Linux: 4.6.0-rc6 x86_64)
Primary screen: DP 2560x1440, crtc 26
FBC last action not supported
Can't test PSR: no usable eDP screen.
Sink CRC not supported: primary screen is not eDP
Timed out: CRC reading
Subtest fbc-1p-primscrn-spr-indfb-fullscreen: FAIL (5.806s)
-------- >8 --------

On v4.6-rc6 plus drm-intel-nightly, the test apparently passed:

-------- 8< --------
IGT-Version: 1.14-gc03a8ae6bf2f (x86_64) (Linux: 4.6.0-rc6+intel-drm-nightly x86_64)
Primary screen: DP 2560x1440, crtc 26
FBC last action not supported
Can't test PSR: no usable eDP screen.
Sink CRC not supported: primary screen is not eDP
Subtest fbc-1p-primscrn-spr-indfb-fullscreen: SUCCESS (1.018s)
-------- >8 --------

I will send the kernel messages from each of these two tests in a reply to
intel-gfx@xxxxxxxxxxxxxxxxxxxxx only.
-- 
Stefan Richter
-======----- -=-= -=---
http://arcgraph.de/sr/