mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-12-27 12:21:22 -05:00
Code Issues Packages Projects Releases Wiki Activity

dma-buf: rework stub fence initialisation v2

Browse Source 
Instead of doing this on the first call of the function just initialize
the stub fence during kernel load.

This has the clear advantage of lower overhead and also doesn't rely on
the ops to not be NULL any more.

v2: use correct signal function

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Link: https://lore.kernel.org/r/20251031134442.113648-3-christian.koenig@amd.com
This commit is contained in:
Christian König
2025-10-08 15:39:26 +02:00
parent 6126a7f27f
commit ad531f3d8b
1 changed files with 15 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/dma-buf/dma-fence.c
View File

@@ -121,29 +121,27 @@ static const struct dma_fence_ops dma_fence_stub_ops = {
.get_timeline_name = dma_fence_stub_get_name,
};
static int __init dma_fence_init_stub(void)
{
dma_fence_init(&dma_fence_stub, &dma_fence_stub_ops,
&dma_fence_stub_lock, 0, 0);
set_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
&dma_fence_stub.flags);
dma_fence_signal(&dma_fence_stub);
return 0;
}
subsys_initcall(dma_fence_init_stub);
/**
* dma_fence_get_stub - return a signaled fence
*
* Return a stub fence which is already signaled. The fence's
* timestamp corresponds to the first time after boot this
* function is called.
* Return a stub fence which is already signaled. The fence's timestamp
* corresponds to the initialisation time of the linux kernel.
*/
struct dma_fence *dma_fence_get_stub(void)
{
spin_lock(&dma_fence_stub_lock);
if (!dma_fence_stub.ops) {
dma_fence_init(&dma_fence_stub,
&dma_fence_stub_ops,
&dma_fence_stub_lock,
0, 0);
set_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
&dma_fence_stub.flags);
dma_fence_signal_locked(&dma_fence_stub);
}
spin_unlock(&dma_fence_stub_lock);
return dma_fence_get(&dma_fence_stub);
}
EXPORT_SYMBOL(dma_fence_get_stub);