Sagar Kamble ed16377983 gpu: nvgpu: allocate comptags and store metadata in REGISTER_BUFFER ioctl ...

To enable userspace query about comptags allocation status of a buffer,
comptags are to be allocated only during buffer registration done by
nvrm_gpu. Earlier, they were allocated during map.

nvrm_gpu will be sending metadata blob to be associated with the buffer.
This will have to be stored in the dmabuf privdata for all the buffers
registered by nvrm_gpu.

This patch moves the privdata allocation to buffer registration ioctl.

Remove g->mm.priv_lock as it is not needed now. This lock was added
to protect dmabuf private data setup. That private data is now
handled through dmabuf->ops and setup of dmabuf->ops is done
under dmabuf->lock.

To support legacy userspace, this patch still allocates comptags on
demand on map calls for unregistered buffers.

Bug 200586313

Change-Id: I88b2ca04c733dd02a84bcbf05060bddc00147790
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2480761
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>

2021-09-02 11:42:08 -07:00

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