[Bug 66963] Rv6xx dpm problems

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66963

--- Comment #263 from Kajzer <kap3tan at gmail.com> ---
(In reply to Alex Deucher from comment #251)
> (In reply to Kajzer from comment #250)
> > With kernels 3.17 and 3.18 I have freezes when playing some games, those
> > freezes can happen somewhere between 10 minutes and 1 hour.
> > Freeze occur only in games.
> > With kernel 3.16 everything is normal and there are no freezes.
> > Latest patch (auto->high and radeon.dpm=1) is used in each of those kernels.
> > Everything else is exactly the same, just booting with different kernel
> > makes a difference.
> 
> Can you bisect?

Sorry for delay.
In the meantime I tried every revision of kernel and this bug happened in each.
Last known good kernel was 3.16.7.
Here's how I started bisect :

git bisect start -- drivers/gpu/drm/radeon
git bisect good v3.16
git bisect bad v3.17

Results :

$ git bisect log
git bisect start '--' 'drivers/gpu/drm/radeon/'
# bad: [bfe01a5ba2490f299e1d2d5508cbbbadd897bbe9] Linux 3.17
git bisect bad bfe01a5ba2490f299e1d2d5508cbbbadd897bbe9
# good: [19583ca584d6f574384e17fe7613dfaeadcdc4a6] Linux 3.16
git bisect good 19583ca584d6f574384e17fe7613dfaeadcdc4a6
# good: [03f62abd112d5150b6ce8957fa85d4f6e85e357f] drm/radeon: split PT setup
in more functions
git bisect good 03f62abd112d5150b6ce8957fa85d4f6e85e357f
# bad: [52da51f0f9ea9d213adfc99223630707b26d1d38] drm/radeon: fix active_cu
mask on SI and CIK after re-init (v3)
git bisect bad 52da51f0f9ea9d213adfc99223630707b26d1d38
# good: [6e909f74db2aa9c5b5606b81efcbe18f2749b008] drm/radeon: add bapm module
parameter
git bisect good 6e909f74db2aa9c5b5606b81efcbe18f2749b008
# good: [c8ad8b563c7e724e2fedc3aee5bcbd401668474c] drm/radeon: Remove duplicate
include from Makefile
git bisect good c8ad8b563c7e724e2fedc3aee5bcbd401668474c
# good: [73ef0e0d62de4a8d40d34a6f645faee2f6e1ac33] drm/radeon: fix display
handling in radeon_gpu_reset
git bisect good 73ef0e0d62de4a8d40d34a6f645faee2f6e1ac33
# good: [cd1c9c1a4b06d3bc264e774ad84c410ce02e124e] drm/radeon: re-enable
selective GPUVM flushing
git bisect good cd1c9c1a4b06d3bc264e774ad84c410ce02e124e
# bad: [6101b3ae94b4f266456308824e9ca4eab1235d1a] drm/radeon: fix active cu
count for SI and CIK
git bisect bad 6101b3ae94b4f266456308824e9ca4eab1235d1a
# first bad commit: [6101b3ae94b4f266456308824e9ca4eab1235d1a] drm/radeon: fix
active cu count for SI and CIK
# bad: [6101b3ae94b4f266456308824e9ca4eab1235d1a] drm/radeon: fix active cu
count for SI and CIK

git bisect visualize 
commit 6101b3ae94b4f266456308824e9ca4eab1235d1a
Author: Alex Deucher <alexander.deucher at amd.com>
Date:   Tue Aug 19 11:54:15 2014 -0400

    drm/radeon: fix active cu count for SI and CIK

    This fixes the CU count reported to userspace for
    OpenCL.

    bug:
    https://bugzilla.kernel.org/show_bug.cgi?id=82581

    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
    Reviewed-by: Michel Dänzer <michel.daenzer at amd.com>
    Cc: stable at vger.kernel.org

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