[Intel-gfx] [PATCH] drm: Make drm_read() more robust against multithreaded races

[Daniel Vetter]

On Thu, Dec 04, 2014 at 06:19:54PM -0800, shuang.he at intel.com wrote:
> Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
> -------------------------------------Summary-------------------------------------
> Platform          Delta          drm-intel-nightly          Series Applied
> PNV                                  364/364              364/364
> ILK                                  366/366              366/366
> SNB                                  450/450              450/450
> IVB              +17                 481/498              498/498

Today there have been a lot of prts test results with +17 for ivb. Is
something wrong with the baseline results that there's always the same
regressions/improvements?

In general there's an awful lot of noise in prts results, and off-by-one
in comparing results would explain a lot ...
-Daniel

> BYT                                  289/289              289/289
> HSW                                  564/564              564/564
> BDW                                  417/417              417/417
> -------------------------------------Detailed-------------------------------------
> Platform  Test                                drm-intel-nightly          Series Applied
>  IVB  igt_kms_3d      DMESG_WARN(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_cursor_crc_cursor-128x128-onscreen      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_cursor_crc_cursor-128x128-random      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_cursor_crc_cursor-128x128-sliding      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_cursor_crc_cursor-256x256-offscreen      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_cursor_crc_cursor-256x256-onscreen      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_cursor_crc_cursor-256x256-sliding      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_cursor_crc_cursor-64x64-offscreen      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_cursor_crc_cursor-64x64-onscreen      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_cursor_crc_cursor-64x64-random      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_cursor_crc_cursor-64x64-sliding      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_cursor_crc_cursor-size-change      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_fence_pin_leak      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_mmio_vs_cs_flip_setcrtc_vs_cs_flip      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_mmio_vs_cs_flip_setplane_vs_cs_flip      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_rotation_crc_primary-rotation      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
>  IVB  igt_kms_rotation_crc_sprite-rotation      NSPT(1, M34)PASS(10, M4M34M21)      PASS(1, M34)
> Note: You need to pay more attention to line start with '*'
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch