Proposal for a new CS ioctl, kernel pseudo code:
lock(_lock);
serial = get_next_serial(dev);
add_wait_command(ring, serial - 1);
add_exec_cmdbuf(ring, user_cmdbuf);
add_signal_command(ring, serial);
*ring->doorbell = FIRE;
unlock(_lock);
See? Just like userspace submit, but in the kernel without
What about direct submit from the kernel where the process still has write
access to the GPU ring buffer but doesn't use it? I think that solves your
preemption example, but leaves a potential backdoor for a process to
overwrite the signal commands, which shouldn't be a problem since we are OK
On Mon, May 3, 2021 at 10:16 AM Bas Nieuwenhuizen
wrote:
>
> On Mon, May 3, 2021 at 5:00 PM Jason Ekstrand wrote:
> >
> > Sorry for the top-post but there's no good thing to reply to here...
> >
> > One of the things pointed out to me recently by Daniel Vetter that I
> > didn't fully understand
On Mon, May 3, 2021 at 5:00 PM Jason Ekstrand wrote:
>
> Sorry for the top-post but there's no good thing to reply to here...
>
> One of the things pointed out to me recently by Daniel Vetter that I
> didn't fully understand before is that dma_buf has a very subtle
> second requirement beyond
On Mon, May 3, 2021 at 10:03 AM Christian König
wrote:
>
> Am 03.05.21 um 16:59 schrieb Jason Ekstrand:
> > Sorry for the top-post but there's no good thing to reply to here...
> >
> > One of the things pointed out to me recently by Daniel Vetter that I
> > didn't fully understand before is that
Am 03.05.21 um 16:59 schrieb Jason Ekstrand:
Sorry for the top-post but there's no good thing to reply to here...
One of the things pointed out to me recently by Daniel Vetter that I
didn't fully understand before is that dma_buf has a very subtle
second requirement beyond finite time
Sorry for the top-post but there's no good thing to reply to here...
One of the things pointed out to me recently by Daniel Vetter that I
didn't fully understand before is that dma_buf has a very subtle
second requirement beyond finite time completion: Nothing required
for signaling a dma-fence
On Sat, May 1, 2021 at 6:27 PM Marek Olšák wrote:
>
> On Wed, Apr 28, 2021 at 5:07 AM Michel Dänzer wrote:
>>
>> On 2021-04-28 8:59 a.m., Christian König wrote:
>> > Hi Dave,
>> >
>> > Am 27.04.21 um 21:23 schrieb Marek Olšák:
>> >> Supporting interop with any device is always possible. It
