[PATCH 0/3] Deferr load of radeon/amdgpu until amdkfd is loaded

[Xinliang Liu]

On 15 February 2016 at 19:04, Oded Gabbay <oded.gabbay at gmail.com> wrote:
> On Sun, Feb 14, 2016 at 2:58 PM, Daniel Vetter <daniel at ffwll.ch> wrote:
>> On Sun, Feb 14, 2016 at 11:16:52AM +0200, Oded Gabbay wrote:
>>> Following Daniel's request, I spent some time removing the hard requirement
>>> that radeon and amdgpu will always appear _after_ amdkfd in the drm Makefile.
>>>
>>> This was done by modifing radeon/amdgpu to defer their loading if they detect
>>> that amdkfd is not loaded yet, in case the drivers are built inside the
>>> kernel image.
>>>
>>> See the patch's individiual commit messages for more explanation.
>>>
>>> This patch-set was tested on a KAVERI machine, with multiple configurations:
>>>
>>> 1. radeon + amdgpu (CIK disabled) + amdkfd as kernel modules
>>> 2. radeon + amdgpu (CIK disabled) + amdkfd inside the kernel image
>>> 3. amdgpu (CIK enabled) + amdkfd inside the kernel image (radeon not compiled)
>>> 4. amdgpu (CIK enabled) inside the kernel image (radeon + amdkfd not compiled)
>>> 5. radeon + amdgpu (CIK disabled) as kernel modules (amdkfd not compiled)
>>
>> Care to throw one patch on top (maybe on top of the patch floating around)
>> to reorder amdkfd to be alphabetical? Just to make sure this doesn't get
>> broken again accidentally. Or maybe just pick up the other patch and adapt
>> it so it's all in one series.
>>
>> Thanks, Daniel
>
> Hi Daniel,
>
> I thought about it and I think I prefer to leave the current order as
> it is, for the reason that I observed the boot-up process is a little
> bit faster when the deferred probing doesn't occur. This is probably
> because all the moves between pending drivers list and active driver
> list.
>
> Although this patch-set ensure that the kernel will boot successfully
> with no regard to the order of amdkfd/radeon/amdgpu in the drm
> makefile, I think that if the current order gives us a bit less boot
> time then it is better to keep things as they are.
>
> Thanks,
>
>       Oded
>
>>>
>>> Thanks,
>>>
>>>     Oded
>>>
>>> Oded Gabbay (3):
>>>   drm/amdkfd: Track when module's init is complete
>>>   drm/radeon: Return -EPROBE_DEFER when amdkfd not loaded
>>>   drm/amdgpu: Return -EPROBE_DEFER when amdkfd not loaded
>>>
>>>  drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c      | 57 +++++++++----------------
>>>  drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h      |  2 +-
>>>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c         | 10 ++++-
>>>  drivers/gpu/drm/amd/amdkfd/kfd_module.c         | 15 +++++--
>>>  drivers/gpu/drm/amd/include/kgd_kfd_interface.h |  2 +-
>>>  drivers/gpu/drm/radeon/radeon_drv.c             | 10 ++++-
>>>  drivers/gpu/drm/radeon/radeon_kfd.c             | 25 ++++++-----
>>>  drivers/gpu/drm/radeon/radeon_kfd.h             |  2 +-
>>>  8 files changed, 64 insertions(+), 59 deletions(-)
>>>
>>> --
>>> 2.5.0
>>>
>>
>> --
>> Daniel Vetter
>> Software Engineer, Intel Corporation
>> http://blog.ffwll.ch
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