From: "Christian König" <christian.koenig@amd.com>
To: Thomas Zimmermann <tzimmermann@suse.de>,
alexander.deucher@amd.com, airlied@linux.ie, daniel@ffwll.ch,
bskeggs@redhat.com, ray.huang@amd.com,
linux-graphics-maintainer@vmware.com, sroland@vmware.com,
zackr@vmware.com, shashank.sharma@amd.com, sam@ravnborg.org,
emil.velikov@collabora.com, Felix.Kuehling@amd.com,
nirmoy.das@amd.com
Cc: nouveau@lists.freedesktop.org, amd-gfx@lists.freedesktop.org,
dri-devel@lists.freedesktop.org
Subject: Re: [Nouveau] [PATCH 3/8] drm/amdgpu: Implement mmap as GEM object function
Date: Tue, 6 Apr 2021 15:04:00 +0200 [thread overview]
Message-ID: <4d859bdf-a0c8-34f6-2f84-c7b0f0a226b5@amd.com> (raw)
In-Reply-To: <878b7bd3-ea06-679a-4553-0eb3091b02a3@suse.de>
Am 06.04.21 um 14:52 schrieb Thomas Zimmermann:
> Hi
>
> Am 06.04.21 um 14:42 schrieb Christian König:
>> Hi Thomas,
>>
>> Am 06.04.21 um 13:55 schrieb Thomas Zimmermann:
>>> Hi
>>>
>>> Am 06.04.21 um 12:56 schrieb Christian König:
>>>>>
>>>>> In the end I went with the semantics I found in amdgpu_mmap() and
>>>>> handled KFD specially. Let me know if this requires to be changed.
>>>>
>>>> Well the question is where is the call to
>>>> drm_vma_node_verify_access() now? Cause that needs to be skipped
>>>> for KFD BOs.
>>>
>>> I see. It's now drm_vma_node_is_allowed(); called by drm_gem_mmap().
>>> [1] So drm_gem_mmap() cannot be used by amdgpu.
>>>
>>> If I understand the code at [2] correctly, KFD objects don't use the
>>> GEM ioctl interfaces, but they still use the internal GEM object
>>> that is part of the TTM BO. In this case, amdgpu could have its own
>>> version of drm_gem_mmap(), which calls drm_gem_mmap_obj(), [3] which
>>> in turn handles the mmap details via GEM object functions.
>>
>> Correct, well we could cleanup the KFD to use the GEM functions as well.
>
> The KFD code already calls amdgpu_gem_object_create(). It should have
> the object-functions pointer set for use with mmap. Not sure what the
> use of drm_vma_node_is_allowed() would involve.
The KFD allows BOs to be mmaped with different offsets than what's used
in the DRM node.
So drm_vma_node_is_allowed() would return false as far as I know.
Regards,
Christian.
>
> Best regards
> Thomas
>
>>
>> Felix what exactly was your objections to using this?
>>
>> Regards,
>> Christian.
>>
>>>
>>> drm_gem_prime_mmap() doesn't do any additional verification.
>>>
>>> Best regards
>>> Thomas
>>>
>>> [1]
>>> https://elixir.bootlin.com/linux/v5.11.11/source/drivers/gpu/drm/drm_gem.c#L1156
>>>
>>> [2]
>>> https://elixir.bootlin.com/linux/v5.11.11/source/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c#L1224
>>>
>>> [3]
>>> https://elixir.bootlin.com/linux/v5.12-rc6/source/drivers/gpu/drm/drm_gem.c#L1053
>>>
>>>
>>>
>>>>
>>>> Regards,
>>>> Christian.
>>>>
>>>>>
>>>>> Best regards
>>>>> Thomas
>>>>>
>>>>>>> -
>>>>>>> int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t
>>>>>>> src_offset,
>>>>>>> uint64_t dst_offset, uint32_t byte_count,
>>>>>>> struct dma_resv *resv,
>>>>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
>>>>>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
>>>>>>> index dec0db8b0b13..6e51faad7371 100644
>>>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
>>>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
>>>>>>> @@ -146,7 +146,6 @@ int amdgpu_fill_buffer(struct amdgpu_bo *bo,
>>>>>>> struct dma_resv *resv,
>>>>>>> struct dma_fence **fence);
>>>>>>> -int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma);
>>>>>>> int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo);
>>>>>>> int amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo);
>>>>>>> uint64_t amdgpu_ttm_domain_start(struct amdgpu_device *adev,
>>>>>>> uint32_t type);
>>>>>>
>>>>>> _______________________________________________
>>>>>> dri-devel mailing list
>>>>>> dri-devel@lists.freedesktop.org
>>>>>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>>>>>
>>>>
>>>> _______________________________________________
>>>> dri-devel mailing list
>>>> dri-devel@lists.freedesktop.org
>>>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>>>
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
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next prev parent reply other threads:[~2021-04-06 13:04 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-06 9:08 [Nouveau] [PATCH 0/8] drm: Clean up mmap for TTM-based GEM drivers Thomas Zimmermann
2021-04-06 9:08 ` [Nouveau] [PATCH 1/8] drm/ttm: Don't override vm_ops callbacks, if set Thomas Zimmermann
2021-04-06 9:08 ` [Nouveau] [PATCH 2/8] drm/amdgpu: Remove unused function amdgpu_bo_fbdev_mmap() Thomas Zimmermann
2021-04-06 9:43 ` Christian König
2021-04-06 10:21 ` Thomas Zimmermann
2021-04-06 9:08 ` [Nouveau] [PATCH 3/8] drm/amdgpu: Implement mmap as GEM object function Thomas Zimmermann
2021-04-06 9:35 ` Christian König
2021-04-06 10:38 ` Thomas Zimmermann
2021-04-06 10:56 ` Christian König
2021-04-06 11:55 ` Thomas Zimmermann
2021-04-06 12:42 ` Christian König
2021-04-06 12:52 ` Thomas Zimmermann
2021-04-06 13:04 ` Christian König [this message]
2021-04-06 15:22 ` Felix Kuehling
2021-04-06 15:27 ` Felix Kuehling
2021-04-07 11:25 ` Christian König
2021-04-07 19:34 ` Felix Kuehling
2021-04-07 19:49 ` Felix Kuehling
2021-04-08 4:45 ` Thomas Zimmermann
2021-04-14 7:44 ` Thomas Zimmermann
2021-04-14 8:37 ` Felix Kuehling
2021-04-06 9:08 ` [Nouveau] [PATCH 4/8] drm/radeon: " Thomas Zimmermann
2021-04-06 9:38 ` Christian König
2021-04-06 14:18 ` Alex Deucher
2021-04-06 9:09 ` [Nouveau] [PATCH 5/8] drm/nouveau: " Thomas Zimmermann
2021-04-06 9:09 ` [Nouveau] [PATCH 6/8] drm/vmwgfx: Inline ttm_bo_mmap() into vmwgfx driver Thomas Zimmermann
2021-04-07 16:52 ` Zack Rusin
2021-04-06 9:09 ` [Nouveau] [PATCH 7/8] drm/vmwgfx: Inline vmw_verify_access() Thomas Zimmermann
2021-04-07 16:52 ` Zack Rusin
2021-04-06 9:09 ` [Nouveau] [PATCH 8/8] drm/ttm: Remove ttm_bo_mmap() and friends Thomas Zimmermann
2021-04-06 9:40 ` Christian König
2021-04-08 11:19 ` [Nouveau] [PATCH 0/8] drm: Clean up mmap for TTM-based GEM drivers Daniel Vetter
2021-04-08 11:38 ` Thomas Zimmermann
2021-04-08 11:42 ` Daniel Vetter
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