Re: [PATCH 09/17] drm/i915: Don't use atomics for pg_dirty_rings

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

Daniel Vetter <daniel.vetter@ffwll.ch> writes:

> It's already protected by the bkl^Wdev->struct_mutex. While at it
> realign some related code.
>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

> ---
>  drivers/gpu/drm/i915/i915_gem_context.c    | 16 ++++++++--------
>  drivers/gpu/drm/i915/i915_gem_execbuffer.c |  5 ++---
>  2 files changed, 10 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
> index 6b0962db2cf7..5a47eb5e3c5d 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> @@ -578,11 +578,9 @@ static inline bool should_skip_switch(struct intel_engine_cs *ring,
>  	if (to->remap_slice)
>  		return false;
>  
> -	if (to->ppgtt) {
> -		if (from == to && !test_bit(ring->id,
> -				&to->ppgtt->pd_dirty_rings))
> -			return true;
> -	}
> +	if (to->ppgtt && from == to &&
> +	    !(intel_ring_flag(ring) & to->ppgtt->pd_dirty_rings))
> +		return true;
>  
>  	return false;
>  }
> @@ -668,7 +666,7 @@ static int do_switch(struct intel_engine_cs *ring,
>  			goto unpin_out;
>  
>  		/* Doing a PD load always reloads the page dirs */
> -		clear_bit(ring->id, &to->ppgtt->pd_dirty_rings);
> +		to->ppgtt->pd_dirty_rings &= ~intel_ring_flag(ring);
>  	}
>  
>  	if (ring != &dev_priv->ring[RCS]) {
> @@ -696,12 +694,14 @@ static int do_switch(struct intel_engine_cs *ring,
>  		 * space. This means we must enforce that a page table load
>  		 * occur when this occurs. */
>  	} else if (to->ppgtt &&
> -			test_and_clear_bit(ring->id, &to->ppgtt->pd_dirty_rings))
> +		   (intel_ring_flag(ring) & to->ppgtt->pd_dirty_rings)) {
>  		hw_flags |= MI_FORCE_RESTORE;
> +		to->ppgtt->pd_dirty_rings &= ~intel_ring_flag(ring);
> +	}
>  
>  	/* We should never emit switch_mm more than once */
>  	WARN_ON(needs_pd_load_pre(ring, to) &&
> -			needs_pd_load_post(ring, to, hw_flags));
> +		needs_pd_load_post(ring, to, hw_flags));
>  
>  	ret = mi_set_context(ring, to, hw_flags);
>  	if (ret)
> diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> index 1d5badf1b887..0b06c6de27de 100644
> --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> @@ -1247,9 +1247,8 @@ i915_gem_ringbuffer_submission(struct drm_device *dev, struct drm_file *file,
>  	if (ret)
>  		goto error;
>  
> -	if (ctx->ppgtt)
> -		WARN(ctx->ppgtt->pd_dirty_rings & (1<<ring->id),
> -			"%s didn't clear reload\n", ring->name);
> +	WARN(ctx->ppgtt && ctx->ppgtt->pd_dirty_rings & (1<<ring->id),
> +	     "%s didn't clear reload\n", ring->name);
>  
>  	instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK;
>  	instp_mask = I915_EXEC_CONSTANTS_MASK;
> -- 
> 2.1.0
>
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