[Intel-gfx] [PATCH] drm/i915: Move drm_framebuffer_unreference out of struct_mutex for takeover

[Jani Nikula]

On Tue, 14 Apr 2015, Ville Syrjälä <ville.syrjala at linux.intel.com> wrote:
> On Mon, Apr 13, 2015 at 04:03:03PM +0100, Tvrtko Ursulin wrote:
>> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>> 
>> intel_user_framebuffer_destroy() requires the struct_mutex for its
>> object bookkeeping, so this means that all calls to
>> drm_framebuffer_unreference must be held without that lock.
>> 
>> This is a simplified version of the identically named patch by Chris Wilson.
>> 
>>     Regression from commit ab8d66752a9c28cd6c94fa173feacdfc1554aa03
>>     Author: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>>     Date:   Mon Feb 2 15:44:15 2015 +0000
>> 
>>         drm/i915: Track old framebuffer instead of object
>> 
>> v2: Bikeshedding.
>> 
>> References: https://bugs.freedesktop.org/show_bug.cgi?id=89166
>> Cc: Chris Wilson <chris at chris-wilson.co.uk>
>> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
>> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
>> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>
> Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Pushed to drm-intel-next-fixes, thanks for the patch and review.

BR,
Jani.


>
>> ---
>>  drivers/gpu/drm/i915/intel_display.c | 14 ++++++++------
>>  1 file changed, 8 insertions(+), 6 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>> index 97922fb..5fb11bc 100644
>> --- a/drivers/gpu/drm/i915/intel_display.c
>> +++ b/drivers/gpu/drm/i915/intel_display.c
>> @@ -14739,6 +14739,7 @@ void intel_modeset_gem_init(struct drm_device *dev)
>>  	struct drm_i915_private *dev_priv = dev->dev_private;
>>  	struct drm_crtc *c;
>>  	struct drm_i915_gem_object *obj;
>> +	int ret;
>>  
>>  	mutex_lock(&dev->struct_mutex);
>>  	intel_init_gt_powersave(dev);
>> @@ -14763,16 +14764,18 @@ void intel_modeset_gem_init(struct drm_device *dev)
>>  	 * pinned & fenced.  When we do the allocation it's too early
>>  	 * for this.
>>  	 */
>> -	mutex_lock(&dev->struct_mutex);
>>  	for_each_crtc(dev, c) {
>>  		obj = intel_fb_obj(c->primary->fb);
>>  		if (obj == NULL)
>>  			continue;
>>  
>> -		if (intel_pin_and_fence_fb_obj(c->primary,
>> -					       c->primary->fb,
>> -					       c->primary->state,
>> -					       NULL)) {
>> +		mutex_lock(&dev->struct_mutex);
>> +		ret = intel_pin_and_fence_fb_obj(c->primary,
>> +						 c->primary->fb,
>> +						 c->primary->state,
>> +						 NULL);
>> +		mutex_unlock(&dev->struct_mutex);
>> +		if (ret) {
>>  			DRM_ERROR("failed to pin boot fb on pipe %d\n",
>>  				  to_intel_crtc(c)->pipe);
>>  			drm_framebuffer_unreference(c->primary->fb);
>> @@ -14780,7 +14783,6 @@ void intel_modeset_gem_init(struct drm_device *dev)
>>  			update_state_fb(c->primary);
>>  		}
>>  	}
>> -	mutex_unlock(&dev->struct_mutex);
>>  
>>  	intel_backlight_register(dev);
>>  }
>> -- 
>> 2.3.5
>
> -- 
> Ville Syrjälä
> Intel OTC
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-- 
Jani Nikula, Intel Open Source Technology Center