[Bug 100712] ring 0 stalled after bytes_moved_threshold reached - Cap Verde - HD 7770

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=100712

--- Comment #4 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Julien Isorce from comment #0)
> In kernel radeon_object.c::radeon_bo_list_validate, once "bytes_moved >
> bytes_moved_threshold" is reached (this is the case for 850 bo in the same
> list_for_each_entry loop), I can see that radeon_ib_schedule emits a fence
> that it takes more than the radeon.lockup_timeout to be signaled.

radeon_ib_schedule is called for submitting the command stream from userspace,
not for any BO moves directly, right?

How did you determine that this hang is directly related to bytes_moved /
bytes_moved_threshold? Maybe it's only indirectly related, e.g. due to the
threshold preventing a BO from being moved to VRAM despite userspace's
preference.


> Also it seems the fence is signaled by swapper after more than 10 seconds
> but it is too late. I requires to reduce the "15" param above to 4 to see
> that.

How does "swapper" (what is that exactly?) signal the fence?


> Is it normal that radeon_bo_list_validate still tries to move the bo if
> bytes_moved_threshold is reached ?

There are circumstances where a BO has to be moved even though the threshold is
reached.


> Indeed ttm_bo_validate is always called

ttm_bo_validate must be called for every BO referenced by the command stream
from userspace for correct lifetime management of its memory.


> (it blits from vram to vram).

It might be worth looking into why this happens, though. If domain ==
current_domain == RADEON_GEM_DOMAIN_VRAM, I wouldn't expect ttm_bo_validate to
trigger a blit.

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