On Sun, Apr 17, 2011 at 10:09 AM, Joerg Roedel <joro at 8bytes.org> wrote: > On Sat, Apr 16, 2011 at 02:54:04PM -0400, Jerome Glisse wrote: > >> If you want to go the printk way you can add printk before each test >> ring_test, ib_test in r600.c this 2 functions are the own that might >> trigger the first GPU gart activities. > > Okay, I found the place in source that triggers this. It happens in the > function r600_ib_test. The interesting thing is that not the ib-command > itself is responsible but the fence that is emitted afterwards (proved > by removing the fence command, where the problem went away). > I don't know enough about the command semantics to make a guess what > goes wrong there. But maybe you GPU folks have an idea? >
I can't think of anything off hand. It might be worth disabling the call to r600_ib_test() in r600_init() and then seeing if you get any errors when the fences are used later on when X starts or just at that point in the module load sequence. What's odd is that when you tested radeon.no_wb=1 you got the same behavior as that disables shadowing of fence writes to gpu gart mem, so it wouldn't be writing to memory in that case. Alex > ? ? ? ?Joerg > > _______________________________________________ > dri-devel mailing list > dri-devel at lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/dri-devel >
