[Bug 91268] R6xx freezes with kernel 3.17 and up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91268

            Bug ID: 91268
           Summary: R6xx freezes with kernel 3.17 and up
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: kap3tan at gmail.com

Something was introduced in kernel 3.17 which makes my GPU to freeze while
playing games. When it happens screen freeze for a few seconds, then it goes
blank for a few seconds, then it comes back with strange artifacts on the
screen, system is basically unresponsive, the only thing you can do is a hard
reset.
With kernels below 3.17 this doesn't happen.
Mesa version also doesn't matter.
Basically same everything, just booting with different kernel makes a
difference.
3.16 is good and 3.17 is bad (also every other kernel above 3.17)
With kernel 3.16 I can play games for days/weeks and bug will not happen.
With 3.17 it can happen anywhere between 15 minutes and few hours.
I did a bisect and it produced this :

git bisect start '--' 'drivers/gpu/drm/radeon'
# good: [19583ca584d6f574384e17fe7613dfaeadcdc4a6] Linux 3.16
git bisect good 19583ca584d6f574384e17fe7613dfaeadcdc4a6
# bad: [bfe01a5ba2490f299e1d2d5508cbbbadd897bbe9] Linux 3.17
git bisect bad bfe01a5ba2490f299e1d2d5508cbbbadd897bbe9
# bad: [03f62abd112d5150b6ce8957fa85d4f6e85e357f] drm/radeon: split PT setup in
more functions
git bisect bad 03f62abd112d5150b6ce8957fa85d4f6e85e357f
# bad: [391bfec33cd4e103274f197924d41ef648b849de] drm/radeon: remove visible
vram size limit on bo allocation (v4)
git bisect bad 391bfec33cd4e103274f197924d41ef648b849de
# good: [da9976206c15178eeae1b4445c9266125bf35b0a] drm/radeon: enable display
scaling on all connectors (v2)
git bisect good da9976206c15178eeae1b4445c9266125bf35b0a
# good: [380670aebfca998bb67b9cf05fc7f28ebeac4b18] drm/radeon: Demote 'BO
allocation size too large' message to debug only
git bisect good 380670aebfca998bb67b9cf05fc7f28ebeac4b18
# bad: [02376d8282b88f07d0716da6155094c8760b1a13] drm/radeon: Allow
write-combined CPU mappings of BOs in GTT (v2)
git bisect bad 02376d8282b88f07d0716da6155094c8760b1a13
# good: [77497f2735ad6e29c55475e15e9790dbfa2c2ef8] drm/radeon: Pass GART page
flags to radeon_gart_set_page() explicitly
git bisect good 77497f2735ad6e29c55475e15e9790dbfa2c2ef8
# first bad commit: [02376d8282b88f07d0716da6155094c8760b1a13] drm/radeon:
Allow write-combined CPU mappings of BOs in GTT (v2)

commit 02376d8282b88f07d0716da6155094c8760b1a13
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Thu Jul 17 19:01:08 2014 +0900

    drm/radeon: Allow write-combined CPU mappings of BOs in GTT (v2)

    v2: fix rebase onto drm-fixes

    Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
    Reviewed-by: Christian König <christian.koenig at amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

Currently I'm running kernel with commit before the first bad one :
$ git reset --hard 77497f2735ad6e29c55475e15e9790dbfa2c2ef8
HEAD is now at 77497f2 drm/radeon: Pass GART page flags to
radeon_gart_set_page() explicitly

to test it more thoroughly and see if hang will occur.

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