<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - r600g (HD 6950 Cayman) fails piglit tests and hangs system" href="https://bugs.freedesktop.org/show_bug.cgi?id=62959#c13">Comment # 13</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - r600g (HD 6950 Cayman) fails piglit tests and hangs system" href="https://bugs.freedesktop.org/show_bug.cgi?id=62959">bug 62959</a> from <a class="email" href="mailto:maraeo@gmail.com" title="Marek Olšák <maraeo@gmail.com>"> Marek Olšák</a> <pre>This kernel patch fixes everything: diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c index 70d3824..748a933 100644 --- a/drivers/gpu/drm/radeon/radeon_cs.c +++ b/drivers/gpu/drm/radeon/radeon_cs.c @@ -459,6 +459,7 @@ static int radeon_cs_ib_vm_chunk(struct radeon_device *rdev, if (r) { goto out; } + radeon_fence_wait(vm->fence, false); radeon_cs_sync_rings(parser); radeon_ib_sync_to(&parser->ib, vm->fence); radeon_ib_sync_to(&parser->ib, radeon_vm_grab_id( It's merely a workaround and it kills performance, but it's now pretty clear there is a synchronization issue in the kernel affecting all NI chips with virtual memory, and it should now be easier to find the bug. I'm not really familiar with the kernel code. I had to do some code reading before I found the right place to put the wait call in.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>