[Intel-gfx] [PATCH v9 28/70] drm/i915: Take obj lock around set_domain ioctl

[Daniel Vetter]

On Tue, Mar 23, 2021 at 04:50:17PM +0100, Maarten Lankhorst wrote:
> We need to lock the object to move it to the correct domain,
> add the missing lock.
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Reviewed-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>

This conflicted real bad with the in-flight -gt-next stuff that wasn't
reset yet, so I picked up the old version here:

https://lore.kernel.org/intel-gfx/20210128162612.927917-29-maarten.lankhorst@linux.intel.com/

That one looks a lot more reasonable.
-Daniel

> ---
>  drivers/gpu/drm/i915/gem/i915_gem_domain.c | 41 ++++++++++------------
>  1 file changed, 19 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_domain.c b/drivers/gpu/drm/i915/gem/i915_gem_domain.c
> index 41dae0d83dbb..e3537922183b 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_domain.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_domain.c
> @@ -456,13 +456,7 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
>  		 * userptr validity
>  		 */
>  		err = i915_gem_object_userptr_validate(obj);
> -		if (!err)
> -			err = i915_gem_object_wait(obj,
> -						   I915_WAIT_INTERRUPTIBLE |
> -						   I915_WAIT_PRIORITY |
> -						   (write_domain ? I915_WAIT_ALL : 0),
> -						   MAX_SCHEDULE_TIMEOUT);
> -		goto out;
> +		goto out_wait;
>  	}
>  
>  	/*
> @@ -476,6 +470,10 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
>  		goto out;
>  	}
>  
> +	err = i915_gem_object_lock_interruptible(obj, NULL);
> +	if (err)
> +		goto out;
> +
>  	/*
>  	 * Flush and acquire obj->pages so that we are coherent through
>  	 * direct access in memory with previous cached writes through
> @@ -487,7 +485,7 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
>  	 */
>  	err = i915_gem_object_pin_pages(obj);
>  	if (err)
> -		goto out;
> +		goto out_unlock;
>  
>  	/*
>  	 * Already in the desired write domain? Nothing for us to do!
> @@ -500,10 +498,6 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
>  	 * without having to further check the requested write_domain.
>  	 */
>  	if (READ_ONCE(obj->write_domain) == read_domains)
> -		goto out_wait;
> -
> -	err = i915_gem_object_lock_interruptible(obj, NULL);
> -	if (err)
>  		goto out_unpin;
>  
>  	if (read_domains & I915_GEM_DOMAIN_WC)
> @@ -513,19 +507,22 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
>  	else
>  		i915_gem_object_set_to_cpu_domain(obj, write_domain);
>  
> -	i915_gem_object_unlock(obj);
> +out_unpin:
> +	i915_gem_object_unpin_pages(obj);
>  
> +out_unlock:
> +	i915_gem_object_unlock(obj);
>  out_wait:
> -	err = i915_gem_object_wait(obj,
> -				   I915_WAIT_INTERRUPTIBLE |
> -				   I915_WAIT_PRIORITY |
> -				   (write_domain ? I915_WAIT_ALL : 0),
> -				   MAX_SCHEDULE_TIMEOUT);
> -	if (write_domain)
> -		i915_gem_object_invalidate_frontbuffer(obj, ORIGIN_CPU);
> +	if (!err) {
> +		err = i915_gem_object_wait(obj,
> +					  I915_WAIT_INTERRUPTIBLE |
> +					  I915_WAIT_PRIORITY |
> +					  (write_domain ? I915_WAIT_ALL : 0),
> +					  MAX_SCHEDULE_TIMEOUT);
> +		if (write_domain)
> +			i915_gem_object_invalidate_frontbuffer(obj, ORIGIN_CPU);
> +	}
>  
> -out_unpin:
> -	i915_gem_object_unpin_pages(obj);
>  out:
>  	i915_gem_object_put(obj);
>  	return err;
> -- 
> 2.31.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch