Re: [PATCH 15/21] drm/rcar-du: Use GEM CMA object functions

[Thomas Zimmermann <tzimmermann@suse.de>]

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Hi

Am 25.05.20 um 17:38 schrieb Kieran Bingham:
> On 25/05/2020 13:49, Thomas Zimmermann wrote:
>> Hi
>>
>> Am 22.05.20 um 22:12 schrieb Laurent Pinchart:
>>> Hi Thomas,
>>>
>>> Thank you for the patch.
>>>
>>> On Fri, May 22, 2020 at 03:52:40PM +0200, Thomas Zimmermann wrote:
>>>> The rcar-du driver uses the default implementation for CMA functions;
>>>> except for the .dumb_create callback. The __DRM_GEM_CMA_DRIVER_OPS macro
>>>> now sets these defaults and .dumb_create in struct drm_driver. All
>>>> remaining operations are provided by CMA GEM object functions.
>>>>
>>>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
>>>> ---
>>>>  drivers/gpu/drm/rcar-du/rcar_du_drv.c | 11 +----------
>>>>  1 file changed, 1 insertion(+), 10 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
>>>> index 3e67cf70f0402..3728038cec1d1 100644
>>>> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
>>>> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
>>>> @@ -476,16 +476,7 @@ DEFINE_DRM_GEM_CMA_FOPS(rcar_du_fops);
>>>>  
>>>>  static struct drm_driver rcar_du_driver = {
>>>>  	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
>>>> -	.gem_free_object_unlocked = drm_gem_cma_free_object,
>>>> -	.gem_vm_ops		= &drm_gem_cma_vm_ops,
>>>> -	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
>>>> -	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
>>>> -	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
>>>> -	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
>>>> -	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
>>>> -	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
>>>> -	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
>>>> -	.dumb_create		= rcar_du_dumb_create,
>>>> +	__DRM_GEM_CMA_DRIVER_OPS(rcar_du_dumb_create),
>>>
>>> Your __DRM_GEM_CMA_DRIVER_OPS is defined as
>>>
>>> #define __DRM_GEM_CMA_DRIVER_OPS(__dumb_create) \
>>>         .gem_create_object      = drm_cma_gem_create_object_default_funcs, \
>>>         .dumb_create            = (__dumb_create), \
>>>         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd, \
>>>         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle, \
>>>         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table_vmap, \
>>>         .gem_prime_mmap         = drm_gem_prime_mmap
>>>
>>> The patch thus introduces several changes:
>>>
>>> - drm_gem_cma_prime_import_sg_table_vmap() is used instead of
>>>   drm_gem_cma_prime_import_sg_table() combined with .gem_prime_vmap()
>>>   and .gem_prime_vunmap(). I believe that's fine, but splitting that
>>>   change in a separate commit, or at the very least explaining it in
>>>   details in the commit message, would make review easier.
>>>
>>> - .gem_create_object() is now set. That seems to be OK, but I'm not sure
>>>   to grasp all the implications. This should also be explained in the
>>>   commit message, and ideally split to a separate patch.
>>
>> That's relevant during object creation and sets the object functions.
>> See one of my other replies for how this can go away after all CMA
>> drivers have been updated to GEM object functions.
>>
>>
>>>
>>> - drm_gem_cma_prime_mmap() is replaced with drm_gem_prime_mmap(). Same
>>>   comments :-)
>>
>> I relied on the aspeed driver to be correct. After Sam's comment on
>> that, I read the code once again several times. The original
>> implementation clears VM_PFNMAP. And I cannot find that code any longer.
>> Going back to the original function might be better.
>>
>>
>>>
>>> This patch hides way too many changes in what is documented as just
>>> innocent refactoring. It seems other drivers are affected too.
>>
>> Could you test the patchset? I don't have the HW.
> 
> Digging out the branch you provided elsewhere in this thread:
> 
>>>> Could you boot-test with the patchset applied?
>>>
>>> Yes, if you have a git branch I can just build and boot I can
>>> do it quickly!
>>
>> Fantastic! It's the cma-objfuncs branch of
>>
>> https://gitlab.freedesktop.org/tzimmermann/linux.git
> 
> I have successfully run our display tests with your patches here on an
> R-Car H3 Salvator-XS(-es2).
> 
> Tested-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

Thanks for testing.

> 
> 
> 
>> Best regards
>> Thomas
>>
>>>
>>>>  	.fops			= &rcar_du_fops,
>>>>  	.name			= "rcar-du",
>>>>  	.desc			= "Renesas R-Car Display Unit",
>>>
>>
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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