From: "Christian König" <ckoenig.leichtzumerken@gmail.com>
To: Stefan Fritsch <sf@sfritsch.de>, dmoulding@me.com, bskeggs@redhat.com
Cc: nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH] drm/nouveau: wait for the exclusive fence after the shared ones v2
Date: Tue, 14 Dec 2021 10:19:27 +0100 [thread overview]
Message-ID: <8aee128c-0699-5057-2655-4f7d91ac235b@gmail.com> (raw)
In-Reply-To: <b6acb31c-ec63-4242-32da-a35e950e5a67@sfritsch.de>
Am 11.12.21 um 10:59 schrieb Stefan Fritsch:
> On 09.12.21 11:23, Christian König wrote:
>> Always waiting for the exclusive fence resulted on some performance
>> regressions. So try to wait for the shared fences first, then the
>> exclusive fence should always be signaled already.
>>
>> v2: fix incorrectly placed "(", add some comment why we do this.
>>
>> Signed-off-by: Christian König <christian.koenig@amd.com>
>
> Tested-by: Stefan Fritsch <sf@sfritsch.de>
Thanks.
>
> Please also add a cc for linux-stable, so that this is fixed in 5.15.x
Sure, but I still need some acked-by or rb from one of the Nouveau guys.
So gentle ping on that.
Regards,
Christian.
>
> Cheers,
> Stefan
>
>> ---
>> drivers/gpu/drm/nouveau/nouveau_fence.c | 28 +++++++++++++------------
>> 1 file changed, 15 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c
>> b/drivers/gpu/drm/nouveau/nouveau_fence.c
>> index 05d0b3eb3690..0ae416aa76dc 100644
>> --- a/drivers/gpu/drm/nouveau/nouveau_fence.c
>> +++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
>> @@ -353,15 +353,22 @@ nouveau_fence_sync(struct nouveau_bo *nvbo,
>> struct nouveau_channel *chan, bool e
>> if (ret)
>> return ret;
>> - }
>> - fobj = dma_resv_shared_list(resv);
>> - fence = dma_resv_excl_fence(resv);
>> + fobj = NULL;
>> + } else {
>> + fobj = dma_resv_shared_list(resv);
>> + }
>> - if (fence) {
>> + /* Waiting for the exclusive fence first causes performance
>> regressions
>> + * under some circumstances. So manually wait for the shared
>> ones first.
>> + */
>> + for (i = 0; i < (fobj ? fobj->shared_count : 0) && !ret; ++i) {
>> struct nouveau_channel *prev = NULL;
>> bool must_wait = true;
>> + fence = rcu_dereference_protected(fobj->shared[i],
>> + dma_resv_held(resv));
>> +
>> f = nouveau_local_fence(fence, chan->drm);
>> if (f) {
>> rcu_read_lock();
>> @@ -373,20 +380,13 @@ nouveau_fence_sync(struct nouveau_bo *nvbo,
>> struct nouveau_channel *chan, bool e
>> if (must_wait)
>> ret = dma_fence_wait(fence, intr);
>> -
>> - return ret;
>> }
>> - if (!exclusive || !fobj)
>> - return ret;
>> -
>> - for (i = 0; i < fobj->shared_count && !ret; ++i) {
>> + fence = dma_resv_excl_fence(resv);
>> + if (fence) {
>> struct nouveau_channel *prev = NULL;
>> bool must_wait = true;
>> - fence = rcu_dereference_protected(fobj->shared[i],
>> - dma_resv_held(resv));
>> -
>> f = nouveau_local_fence(fence, chan->drm);
>> if (f) {
>> rcu_read_lock();
>> @@ -398,6 +398,8 @@ nouveau_fence_sync(struct nouveau_bo *nvbo,
>> struct nouveau_channel *chan, bool e
>> if (must_wait)
>> ret = dma_fence_wait(fence, intr);
>> +
>> + return ret;
>> }
>> return ret;
next prev parent reply other threads:[~2021-12-14 9:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-09 10:23 [PATCH] drm/nouveau: wait for the exclusive fence after the shared ones v2 Christian König
2021-12-10 9:06 ` [Nouveau] " Thorsten Leemhuis
2021-12-11 9:59 ` Stefan Fritsch
2021-12-14 9:19 ` Christian König [this message]
2021-12-15 22:32 ` [Nouveau] " Ben Skeggs
2021-12-21 10:11 ` Thorsten Leemhuis
2021-12-21 10:20 ` Christian König
2021-12-20 19:17 ` Dan Moulding
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