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gpu: nvgpu: add dup to os fence ops

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The os fences can currently be constructed from a file descriptor, from
a raw syncpt id/value pair, or a struct nvgpu_semaphore. Each os fence
object has exactly one owner for simplicity as the owner is a wrapper
for a refcounted object. This does not allow copying the fences, so
extend struct nvgpu_os_fence_ops with a member to increment the refcount
of the underlying fence. This can be used to "duplicate" the object. The
copy needs an eventual call to ops->drop_ref() to release the refcount.

This will be useful to decouple the features of struct nvgpu_fence_type
needed in the kernel and those needed for userspace.

Jira NVGPU-5248

Change-Id: Ie7b943f0851f62842e941a7283b389bac84ae9ae
Signed-off-by: Konsta Hölttä <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2359063
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Konsta Hölttä
2020-06-10 21:01:15 +03:00
committed by Alex Waterman
parent 9a93dc3c83
commit 8c224adb91
8 changed files with 30 additions and 0 deletions
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7
drivers/gpu/nvgpu/os/linux/os_fence_dma.c
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@@ -53,6 +53,13 @@ int nvgpu_os_fence_dma_install_fd(struct nvgpu_os_fence *s, int fd)
return 0;
}
void nvgpu_os_fence_dma_dup(struct nvgpu_os_fence *s)
{
struct dma_fence *fence = nvgpu_get_dma_fence(s);
dma_fence_get(fence);
}
int nvgpu_os_fence_fdget(struct nvgpu_os_fence *fence_out,
struct nvgpu_channel *c, int fd)
{