Re: [PATCH] drm/i915: Skip fence installation for objects with rotated views

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

On 09/16/2015 06:36 PM, Vivek Kasireddy wrote:
> On Wed, 16 Sep 2015 09:03:33 +0100
> Chris Wilson <chris@chris-wilson.co.uk> wrote:
>
>> On Tue, Sep 15, 2015 at 07:05:12PM -0700, Vivek Kasireddy wrote:
>>> While pinning a fb object to the display plane, only install a fence
>>> if the object is using a normal view. This corresponds with the
>>> behavior found in i915_gem_object_do_pin() where the fencability
>>> criteria is determined only for objects with normal views.
>>>
>>> Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>>> Cc: Chris Wilson <chris@chris-wilson.co.uk>
>>> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>>> Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
>>> ---
>>>   drivers/gpu/drm/i915/intel_display.c | 3 ++-
>>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/gpu/drm/i915/intel_display.c
>>> b/drivers/gpu/drm/i915/intel_display.c index 52fb3f2..8b3e943 100644
>>> --- a/drivers/gpu/drm/i915/intel_display.c
>>> +++ b/drivers/gpu/drm/i915/intel_display.c
>>> @@ -2357,7 +2357,8 @@ intel_pin_and_fence_fb_obj(struct drm_plane
>>> *plane,
>>>   	 * framebuffer compression.  For simplicity, we always
>>> install
>>>   	 * a fence as the cost is not that onerous.
>>>   	 */
>>> -	ret = i915_gem_object_get_fence(obj);
>>> +	ret = view.type == I915_GGTT_VIEW_NORMAL ?
>>> +				i915_gem_object_get_fence(obj) : 0;
>>
>> ret = 0;
>> if (vma->map_and_fenceable)
>> 	ret = i915_gem_object_get_fence(obj);
>>
>> is how I wrote it in my patch. One day that will become
>> i915_vma_get_fence().
>> -Chris
> Hi Chris,
>
> Looks like your solution to this problem -- and potentially others --
> is better and more comprehensive. When do you plan on sending your
> patch out to the mailing list?

For a quick fix maybe just respin this patch to use 
obj->map_and_fenceable criteria as Chris suggested?

You should also add a test case for this into igt/kms_addfb_basic.

Regards,

Tvrtko
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