[Intel-gfx] [PATCH 3/5] drm/i915: Trim the command parser allocations

[John Harrison]

On 13/02/2015 13:23, Chris Wilson wrote:
> On Fri, Feb 13, 2015 at 01:08:59PM +0000, John Harrison wrote:
>>> @@ -1155,40 +1154,30 @@ i915_gem_execbuffer_parse(struct intel_engine_cs *ring,
>>>   			      batch_start_offset,
>>>   			      batch_len,
>>>   			      is_master);
>>> -	if (ret) {
>>> -		if (ret == -EACCES)
>>> -			return batch_obj;
>>> -	} else {
>>> -		struct i915_vma *vma;
>>> +	if (ret)
>>> +		goto err;
>>> -		memset(shadow_exec_entry, 0, sizeof(*shadow_exec_entry));
>>> +	ret = i915_gem_obj_ggtt_pin(shadow_batch_obj, 0, 0);
>> There is no explicit unpin for this. Does it happen automatically
>> due to adding the vma to the eb->vmas list?
> We set the exec_flag that tells us to unpin the obj when unwinding the
> execbuf.
>   
>> Also, does it matter that it will be pinned again (and explicitly
>> unpinned) if the SECURE flag is set?
> No, pin/unpin is just a counter, it just needs to be balanced. (Long
> answer, yes, the restrictions given to both pin requests much match or
> else we will attempt to repin the buffer and fail miserably as the
> object is already pinned.)
> -Chris
>

Reviewed-by: John Harrison <John.C.Harrison at Intel.com>