Re: [PATCH 01/20] drm/amdgpu: Introduce GEM object functions

[Thomas Zimmermann <tzimmermann@suse.de>]

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Hi

Am 13.08.20 um 12:22 schrieb Christian König:
> Am 13.08.20 um 10:36 schrieb Thomas Zimmermann:
>> GEM object functions deprecate several similar callback interfaces in
>> struct drm_driver. This patch replaces the per-driver callbacks with
>> per-instance callbacks in amdgpu. The only exception is gem_prime_mmap,
>> which is non-trivial to convert.
>>
>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    |  6 ------
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 12 ++++++++++++
>>   2 files changed, 12 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> index 81a79760ca61..51525b8774c9 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> @@ -1468,19 +1468,13 @@ static struct drm_driver kms_driver = {
>>       .lastclose = amdgpu_driver_lastclose_kms,
>>       .irq_handler = amdgpu_irq_handler,
>>       .ioctls = amdgpu_ioctls_kms,
>> -    .gem_free_object_unlocked = amdgpu_gem_object_free,
>> -    .gem_open_object = amdgpu_gem_object_open,
>> -    .gem_close_object = amdgpu_gem_object_close,
>>       .dumb_create = amdgpu_mode_dumb_create,
>>       .dumb_map_offset = amdgpu_mode_dumb_mmap,
>>       .fops = &amdgpu_driver_kms_fops,
>>         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
>>       .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
>> -    .gem_prime_export = amdgpu_gem_prime_export,
>>       .gem_prime_import = amdgpu_gem_prime_import,
>> -    .gem_prime_vmap = amdgpu_gem_prime_vmap,
>> -    .gem_prime_vunmap = amdgpu_gem_prime_vunmap,
>>       .gem_prime_mmap = amdgpu_gem_prime_mmap,
>>         .name = DRIVER_NAME,
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>> index 43f4966331dd..ca2b79f94e99 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>> @@ -36,6 +36,7 @@
>>   #include <drm/amdgpu_drm.h>
>>   #include <drm/drm_cache.h>
>>   #include "amdgpu.h"
>> +#include "amdgpu_dma_buf.h"
>>   #include "amdgpu_trace.h"
>>   #include "amdgpu_amdkfd.h"
>>   @@ -510,6 +511,15 @@ bool amdgpu_bo_support_uswc(u64 bo_flags)
>>   #endif
>>   }
>>   +static const struct drm_gem_object_funcs amdgpu_gem_object_funcs = {
>> +    .free = amdgpu_gem_object_free,
>> +    .open = amdgpu_gem_object_open,
>> +    .close = amdgpu_gem_object_close,
>> +    .export = amdgpu_gem_prime_export,
>> +    .vmap = amdgpu_gem_prime_vmap,
>> +    .vunmap = amdgpu_gem_prime_vunmap,
>> +};
>> +
> 
> Wrong file, this belongs into amdgpu_gem.c
> 
>>   static int amdgpu_bo_do_create(struct amdgpu_device *adev,
>>                      struct amdgpu_bo_param *bp,
>>                      struct amdgpu_bo **bo_ptr)
>> @@ -552,6 +562,8 @@ static int amdgpu_bo_do_create(struct
>> amdgpu_device *adev,
>>       bo = kzalloc(sizeof(struct amdgpu_bo), GFP_KERNEL);
>>       if (bo == NULL)
>>           return -ENOMEM;
>> +
>> +    bo->tbo.base.funcs = &amdgpu_gem_object_funcs;
> 
> And this should probably go into amdgpu_gem_object_create().

I'm trying to understand what amdgpu does.  What about all the places
where amdgpu calls amdgpu_bo_create() internally? Wouldn't these miss
the free callback for the GEM object?

Best regards
Thomas

> 
> Apart from that looks like a good idea to me.
> 
> Christian.
> 
>>       drm_gem_private_object_init(adev->ddev, &bo->tbo.base, size);
>>       INIT_LIST_HEAD(&bo->shadow_list);
>>       bo->vm_bo = NULL;
> 

-- 
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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