dma-buf: add new dma_fence_chain container v7

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Lockless container implementation similar to a dma_fence_array, but with
only two elements per node and automatic garbage collection.

v2: properly document dma_fence_chain_for_each, add dma_fence_chain_find_seqno,
    drop prev reference during garbage collection if it's not a chain fence.
v3: use head and iterator for dma_fence_chain_for_each
v4: fix reference count in dma_fence_chain_enable_signaling
v5: fix iteration when walking each chain node
v6: add __rcu for member 'prev' of struct chain node
v7: fix rcu warnings from kernel robot

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Link: https://patchwork.freedesktop.org/patch/295778/?series=58813&rev=1

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Christian König 2019-04-01 17:50:55 +08:00 • committed by Christian König

parent 64e1f830ea

commit 7bf60c52e0

3 changed files with 324 additions and 1 deletions

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3

drivers/dma-buf/Makefile

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241

drivers/dma-buf/dma-fence-chain.c

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81

include/linux/dma-fence-chain.h

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