diff options
| author | Christian König <christian.koenig@amd.com> | 2021-11-09 11:08:18 +0100 |
|---|---|---|
| committer | Christian König <christian.koenig@amd.com> | 2022-04-07 12:53:54 +0200 |
| commit | 0cc848a75b742c3f9800e643cd2c03b9cfdc3d69 (patch) | |
| tree | a3b4d1437f08e2db853e0c4b415248631ddf3534 /include | |
| parent | 61e55c6f5ce11b15b1c21ba9211c09d2354dbe66 (diff) | |
| download | linux-0cc848a75b742c3f9800e643cd2c03b9cfdc3d69.tar.bz2 | |
dma-buf: add DMA_RESV_USAGE_BOOKKEEP v3
Add an usage for submissions independent of implicit sync but still
interesting for memory management.
v2: cleanup the kerneldoc a bit
v3: separate amdgpu changes from this
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220407085946.744568-10-christian.koenig@amd.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/dma-resv.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h index a749f229ae91..1db759eacc98 100644 --- a/include/linux/dma-resv.h +++ b/include/linux/dma-resv.h @@ -55,7 +55,7 @@ struct dma_resv_list; * This enum describes the different use cases for a dma_resv object and * controls which fences are returned when queried. * - * An important fact is that there is the order KERNEL<WRITE<READ and + * An important fact is that there is the order KERNEL<WRITE<READ<BOOKKEEP and * when the dma_resv object is asked for fences for one use case the fences * for the lower use case are returned as well. * @@ -93,6 +93,17 @@ enum dma_resv_usage { * an implicit read dependency. */ DMA_RESV_USAGE_READ, + + /** + * @DMA_RESV_USAGE_BOOKKEEP: No implicit sync. + * + * This should be used by submissions which don't want to participate in + * implicit synchronization. + * + * The most common case are preemption fences as well as page table + * updates and their TLB flushes. + */ + DMA_RESV_USAGE_BOOKKEEP }; /** |