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

["Christian König" <ckoenig.leichtzumerken-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Am 14.09.20 um 17:05 schrieb Thomas Zimmermann:
> 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-l3A5Bk7waGM@public.gmane.org>
>>> ---
>>>    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?

Those shouldn't have a GEM object in the first place.

Or otherwise we would have a reference counting issue.

Regards,
Christian.

>
> 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;
>
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