[PATCH v4 3/4] drm/vc4: Check for the binner bo before handling OOM interrupt
Eric Anholt
eric at anholt.net
Wed Apr 3 18:58:01 UTC 2019
Paul Kocialkowski <paul.kocialkowski at bootlin.com> writes:
> Since the OOM interrupt directly deals with the binner bo, it doesn't
> make sense to try and handle it without a binner buffer registered.
> The interrupt will kick again in due time, so we can safely ignore it
> without a binner bo allocated.
>
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski at bootlin.com>
> ---
> drivers/gpu/drm/vc4/vc4_irq.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_irq.c b/drivers/gpu/drm/vc4/vc4_irq.c
> index ffd0a4388752..723dc86b4511 100644
> --- a/drivers/gpu/drm/vc4/vc4_irq.c
> +++ b/drivers/gpu/drm/vc4/vc4_irq.c
> @@ -64,6 +64,9 @@ vc4_overflow_mem_work(struct work_struct *work)
> struct vc4_exec_info *exec;
> unsigned long irqflags;
Since OOM handling is tricky, could we add a comment to help the next
person try to understand it:
/* The OOM IRQ is level-triggered, so we'll see one at power-on before
* any jobs are submitted. The OOM IRQ is masked when this work is
* scheduled, so we can safely return if there's no binner memory
* (because no client is currently using 3D). When a bin job is
* later submitted, its tile memory allocation will end up bringing us
* back to a non-OOM state so the OOM can be triggered again.
*/
But, actually, I don't see how the OOM IRQ will ever get re-enabled.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 832 bytes
Desc: not available
URL: <https://lists.freedesktop.org/archives/dri-devel/attachments/20190403/aed3c0ae/attachment.sig>
More information about the dri-devel
mailing list