Marco,
What makes you think that the crash after second modprobe is related to
the mappings pointers in DRM module? Can you actually establish the
correlation between these patches and the crash or you are just suspecting
because your other bug had something to do with module removal/insertion?
If it's the latter, then you may want to open another bug report here
https://bugs.freedesktop.org/ (use DRI for product and pick DRM/radeon for
component) and have this issue tracked and addressed separately.
The divide error that your log shows apparently happens at this line
inside r6xx_remap_render_backend:
pipe_rb_ratio = rendering_pipe_num / req_rb_num;
I would suspect that req_rb_num somehow evaluates to zero at the second
modprobe. That variable seems to be the derived of the last three
arguments to r6xx_remap_render_backend. If I look at the caller
(evergreen_gpu_init) the arguments that have the play here are all derived
from the GPU's hardware registers (or are the constant for a given GPU
device). So I suspect that the GPU driver leaves some state in GPU at
module removal that later bites you.
-- Ilija
On Tue, 2 Apr 2013, Marco Munderloh wrote:
Hi Ilija,
Thanks for testing. Other issues are probably unrelated, so I'll send the
last version of the patch to Dave.
I came across another problem which seems related. rmmod radeon works,
however, modprobe radeon afterwards results in a crash (divide error), see
attachment.
Best, Marco
On 02.04.2013 13:23, Ilija Hadzic wrote:
-- Ilija
On Tue, Apr 2, 2013 at 6:36 AM, Marco Munderloh
<munderl@xxxxxxxxxxxxxxxxxxx <mailto:munderl@xxxxxxxxxxxxxxxxxxx>> wrote:
Attached is a v2 of the patch, for reference. I would appreciate if
the original reporter or you tested it in lieu of your proposed patch and
let me know if it
fixes your
issue.
The patch works for me. echo 3 > /proc/sys/vm/drop_caches as well as
rmmod radeon do not end up in a crash anymore. However, I have still no
clue why one of these makes
drm_open to fail. On rmmod radeon I get the following log messages. If
don't know if the 'unpin not necessary' has anything to do with it.
[drm] radeon: finishing device.
radeon 0000:01:00.0: ffff88024e526c00 unpin not necessary
radeon 0000:01:00.0: ffff88024f2f6000 unpin not necessary
radeon 0000:01:00.0: ffff88024f2f6000 unpin not necessary
[TTM] Finalizing pool allocator
[TTM] Finalizing DMA pool allocator
[TTM] Zone kernel: Used memory at exit: 0 kiB
[TTM] Zone dma32: Used memory at exit: 0 kiB
[drm] radeon: ttm finalized
vga_switcheroo: disabled
[drm] Module unloaded
By the way, sometimes my r8169 ethernet controller does not survive
suspend/hibernation (does not detect link). rmmod/modprobe helps. I don't
know if this is related.
--
Dipl.-Ing. Marco Munderloh Mail: munderl@xxxxxxxxxxxxxxxxxxx
Institut für Informationsverarbeitung (TNT) Phone: +49 511 762-19587
Leibniz Universitaet Hannover, Appelstr. 9a Fax: +49 511 762- 5333
30167 Hannover, Germany Web: http://www.tnt.uni-hannover.de/~munderl
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