[PATCH 2/2] drm/radeon: allow zero sized BOs for fences

[Christian König]

Am 07.08.2014 um 17:01 schrieb Jerome Glisse:
> On Thu, Aug 07, 2014 at 04:30:33PM +0200, Christian König wrote:
>> From: Christian König <christian.koenig at amd.com>
>
> Can we get proper change log with motivation for doing that, use case,
> why it can not be done any other ways ...
>
> Change log is invaluable information and empty change log is the worst
> thing ever.

Yeah, sorry. Actually wanted to send out only the first one to get an 
opinion on that before proceeding.

Going to add a proper commit message,
Christian.

>
>> Signed-off-by: Christian König <christian.koenig at amd.com>
>> ---
>>   drivers/gpu/drm/radeon/radeon_drv.c    | 3 ++-
>>   drivers/gpu/drm/radeon/radeon_object.c | 2 +-
>>   drivers/gpu/drm/radeon/radeon_vm.c     | 3 +++
>>   3 files changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
>> index a773830..f788170 100644
>> --- a/drivers/gpu/drm/radeon/radeon_drv.c
>> +++ b/drivers/gpu/drm/radeon/radeon_drv.c
>> @@ -84,9 +84,10 @@
>>    *   2.39.0 - Add INFO query for number of active CUs
>>    *   2.40.0 - Add RADEON_GEM_GTT_WC/UC, flush HDP cache before submitting
>>    *            CS to GPU
>> + *   2.41.0 - Allow zero sized BOs
>>    */
>>   #define KMS_DRIVER_MAJOR	2
>> -#define KMS_DRIVER_MINOR	40
>> +#define KMS_DRIVER_MINOR	41
>>   #define KMS_DRIVER_PATCHLEVEL	0
>>   int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags);
>>   int radeon_driver_unload_kms(struct drm_device *dev);
>> diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
>> index 480c87d..9dd670e 100644
>> --- a/drivers/gpu/drm/radeon/radeon_object.c
>> +++ b/drivers/gpu/drm/radeon/radeon_object.c
>> @@ -154,7 +154,7 @@ int radeon_bo_create(struct radeon_device *rdev,
>>   
>>   	size = ALIGN(size, PAGE_SIZE);
>>   
>> -	if (kernel) {
>> +	if (kernel || size == 0) {
>>   		type = ttm_bo_type_kernel;
>>   	} else if (sg) {
>>   		type = ttm_bo_type_sg;
>> diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c
>> index ccae4d9..a80f856 100644
>> --- a/drivers/gpu/drm/radeon/radeon_vm.c
>> +++ b/drivers/gpu/drm/radeon/radeon_vm.c
>> @@ -877,6 +877,9 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
>>   	uint32_t flags;
>>   	int r;
>>   
>> +	if (bo_va->bo && radeon_bo_size(bo_va->bo) == 0)
>> +		return 0;
>> +
>>   	if (!bo_va->it.start) {
>>   		dev_err(rdev->dev, "bo %p don't has a mapping in vm %p\n",
>>   			bo_va->bo, vm);
>> -- 
>> 1.9.1
>>
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