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From: Andi Shyti <andi@etezian.org>
To: Chris Wilson <chris@chris-wilson.co.uk>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH 5/5] drm/i915/gt: Disable arbitration on no-preempt requests
Date: Fri, 8 Jan 2021 17:27:23 +0200
Message-ID: <X/h5279BCJbh0s+s@jack.zhora.eu> (raw)
In-Reply-To: <20210107221724.10036-5-chris@chris-wilson.co.uk>

Hi Chris,

On Thu, Jan 07, 2021 at 10:17:24PM +0000, Chris Wilson wrote:
> If a request is submitted and known to require no preemption, disable
> arbitration around the batch which prevents the HW from handling a
> preemption request during the payload.
> 
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
> Cc: Matthew Brost <matthew.brost@intel.com>
> Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
> ---
>  drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 6 +++---
>  drivers/gpu/drm/i915/gt/gen8_engine_cs.c       | 3 +++
>  2 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> index cf9a6b4eb913..b91b32195dcf 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> @@ -2534,6 +2534,9 @@ static int eb_submit(struct i915_execbuffer *eb, struct i915_vma *batch)
>  {
>  	int err;
>  
> +	if (intel_context_nopreempt(eb->context))
> +		__set_bit(I915_FENCE_FLAG_NOPREEMPT, &eb->request->fence.flags);
> +
>  	err = eb_move_to_gpu(eb);
>  	if (err)
>  		return err;
> @@ -2574,9 +2577,6 @@ static int eb_submit(struct i915_execbuffer *eb, struct i915_vma *batch)
>  			return err;
>  	}
>  
> -	if (intel_context_nopreempt(eb->context))
> -		__set_bit(I915_FENCE_FLAG_NOPREEMPT, &eb->request->fence.flags);
> -

makes sense to me...

Reviewed-by: Andi Shyti <andi.shyti@intel.com>

Thanks,
Andi
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  reply index

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-07 22:17 [Intel-gfx] [PATCH 1/5] drm/i915/selftests: Skip unstable timing measurements Chris Wilson
2021-01-07 22:17 ` [Intel-gfx] [PATCH 2/5] drm/i915/gt: Restore ce->signal flush before releasing virtual engine Chris Wilson
2021-01-08 15:18   ` Andi Shyti
2021-01-08 15:24     ` Chris Wilson
2021-01-08 15:54       ` Andi Shyti
2021-01-07 22:17 ` [Intel-gfx] [PATCH 3/5] drm/i915/gt: Only retire on the last breadcrumb if the last request Chris Wilson
2021-01-08 15:55   ` Andi Shyti
2021-01-07 22:17 ` [Intel-gfx] [PATCH 4/5] drm/i915/gt: Only disable preemption on gen8 render engines Chris Wilson
2021-01-08 15:24   ` Andi Shyti
2021-01-07 22:17 ` [Intel-gfx] [PATCH 5/5] drm/i915/gt: Disable arbitration on no-preempt requests Chris Wilson
2021-01-08 15:27   ` Andi Shyti [this message]
2021-01-07 23:07 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [1/5] drm/i915/selftests: Skip unstable timing measurements Patchwork
2021-01-07 23:09 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2021-01-07 23:38 ` [Intel-gfx] ✗ Fi.CI.BAT: failure " Patchwork
2021-01-08  0:16 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [1/5] drm/i915/selftests: Skip unstable timing measurements (rev2) Patchwork
2021-01-08  0:18 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2021-01-08  0:45 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-01-08  2:59 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
2021-01-08 12:26 ` [Intel-gfx] [PATCH 1/5] drm/i915/selftests: Skip unstable timing measurements Andi Shyti
2021-01-08 13:26   ` Chris Wilson
2021-01-08 13:51     ` Andi Shyti
2021-01-08 13:54       ` Chris Wilson
2021-01-08 15:04         ` Andi Shyti
2021-01-08 13:28 ` [Intel-gfx] [PATCH] " Chris Wilson
2021-01-08 15:14   ` Chris Wilson
2021-01-08 15:25     ` Andi Shyti
2021-01-08 18:14 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with drm/i915/selftests: Skip unstable timing measurements (rev4) Patchwork
2021-01-08 18:16 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2021-01-08 18:45 ` [Intel-gfx] ✗ Fi.CI.BAT: failure " Patchwork

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