[Intel-gfx] [PATCH 1/2] Revert "dma-buf: Report signaled links inside dma-fence-chain"

[Jani Nikula]

On Fri, 26 Jun 2020, Dave Airlie <airlied at gmail.com> wrote:
> WTUF?
>
> How did this ever land in my tree, there is no ACK on this from anyone
> in core dma-buf,
>
> Intel team, clean your house up here, I'm going to have to ask you to
> stop Chris merging stuff without oversight, if this sort of thing
> happens, this is totally unacceptable.

There's no argument, an ack is required.

In fairness to the i915 maintainers, though, this particular commit was
merged via drm-misc-next [1].

As a side note, there seem to be extra checks in place for acks when
applying non-i915 patches to drm-intel; there are no such checks for
drm-misc.


BR,
Jani.


[1] http://lore.kernel.org/r/20200414090738.GA16827@linux-uq9g

>
> Dave.
>
>
>  Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>     Tested-by: Venkata Sandeep Dhanalakota <venkata.s.dhanalakota at intel.com>
>     Reviewed-by: Venkata Sandeep Dhanalakota <venkata.s.dhanalakota at intel.com>
>
>
> On Thu, 25 Jun 2020 at 22:43, Christian König <christian.koenig at amd.com> wrote:
>>
>> Am 25.06.20 um 14:34 schrieb Lionel Landwerlin:
>> > This reverts commit 5de376bb434f80a13138f0ebedc8351ab73d8b0d.
>> >
>> > This change breaks synchronization of a timeline.
>> > dma_fence_chain_find_seqno() might be a bit of a confusing name but
>> > this function is not trying to find a particular seqno, is supposed to
>> > give a fence to wait on for a particular point in the timeline.
>> >
>> > In a timeline, a particular value is reached when all the points up to
>> > and including that value have signaled.
>> >
>> > Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
>>
>> Reviewed-by: Christian König <christian.koenig at amd.com>
>>
>> > ---
>> >   drivers/dma-buf/dma-fence-chain.c | 7 -------
>> >   1 file changed, 7 deletions(-)
>> >
>> > diff --git a/drivers/dma-buf/dma-fence-chain.c b/drivers/dma-buf/dma-fence-chain.c
>> > index c435bbba851c..3d123502ff12 100644
>> > --- a/drivers/dma-buf/dma-fence-chain.c
>> > +++ b/drivers/dma-buf/dma-fence-chain.c
>> > @@ -99,12 +99,6 @@ int dma_fence_chain_find_seqno(struct dma_fence **pfence, uint64_t seqno)
>> >               return -EINVAL;
>> >
>> >       dma_fence_chain_for_each(*pfence, &chain->base) {
>> > -             if ((*pfence)->seqno < seqno) { /* already signaled */
>> > -                     dma_fence_put(*pfence);
>> > -                     *pfence = NULL;
>> > -                     break;
>> > -             }
>> > -
>> >               if ((*pfence)->context != chain->base.context ||
>> >                   to_dma_fence_chain(*pfence)->prev_seqno < seqno)
>> >                       break;
>> > @@ -228,7 +222,6 @@ EXPORT_SYMBOL(dma_fence_chain_ops);
>> >    * @chain: the chain node to initialize
>> >    * @prev: the previous fence
>> >    * @fence: the current fence
>> > - * @seqno: the sequence number (syncpt) of the fence within the chain
>> >    *
>> >    * Initialize a new chain node and either start a new chain or add the node to
>> >    * the existing chain of the previous fence.
>>
>> _______________________________________________
>> Intel-gfx mailing list
>> Intel-gfx at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Jani Nikula, Intel Open Source Graphics Center