projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1802d0be | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 7bf60c52 CK |
2 | /* |
| 3 | * fence-chain: chain fences together in a timeline | |
| 4 | * | |
| 5 | * Copyright (C) 2018 Advanced Micro Devices, Inc. | |
| 6 | * Authors: | |
| 7 | * Christian König <christian.koenig@amd.com> | |
| 7bf60c52 CK |
8 | */ |
| 9 | ||
| 10 | #ifndef __LINUX_DMA_FENCE_CHAIN_H | |
| 11 | #define __LINUX_DMA_FENCE_CHAIN_H | |
| 12 | ||
| 13 | #include <linux/dma-fence.h> | |
| 14 | #include <linux/irq_work.h> | |
| 15 | ||
| 16 | /** | |
| 17 | * struct dma_fence_chain - fence to represent an node of a fence chain | |
| 18 | * @base: fence base class | |
| 19 | * @lock: spinlock for fence handling | |
| 20 | * @prev: previous fence of the chain | |
| 21 | * @prev_seqno: original previous seqno before garbage collection | |
| 22 | * @fence: encapsulated fence | |
| 23 | * @cb: callback structure for signaling | |
| 24 | * @work: irq work item for signaling | |
| 25 | */ | |
| 26 | struct dma_fence_chain { | |
| 27 | struct dma_fence base; | |
| 28 | spinlock_t lock; | |
| 29 | struct dma_fence __rcu *prev; | |
| 30 | u64 prev_seqno; | |
| 31 | struct dma_fence *fence; | |
| 32 | struct dma_fence_cb cb; | |
| 33 | struct irq_work work; | |
| 34 | }; | |
| 35 | ||
| 36 | extern const struct dma_fence_ops dma_fence_chain_ops; | |
| 37 | ||
| 38 | /** | |
| 39 | * to_dma_fence_chain - cast a fence to a dma_fence_chain | |
| 40 | * @fence: fence to cast to a dma_fence_array | |
| 41 | * | |
| 42 | * Returns NULL if the fence is not a dma_fence_chain, | |
| 43 | * or the dma_fence_chain otherwise. | |
| 44 | */ | |
| 45 | static inline struct dma_fence_chain * | |
| 46 | to_dma_fence_chain(struct dma_fence *fence) | |
| 47 | { | |
| 48 | if (!fence || fence->ops != &dma_fence_chain_ops) | |
| 49 | return NULL; | |
| 50 | ||
| 51 | return container_of(fence, struct dma_fence_chain, base); | |
| 52 | } | |
| 53 | ||
| 54 | /** | |
| 55 | * dma_fence_chain_for_each - iterate over all fences in chain | |
| 56 | * @iter: current fence | |
| 57 | * @head: starting point | |
| 58 | * | |
| 59 | * Iterate over all fences in the chain. We keep a reference to the current | |
| 60 | * fence while inside the loop which must be dropped when breaking out. | |
| 61 | */ | |
| 62 | #define dma_fence_chain_for_each(iter, head) \ | |
| 63 | for (iter = dma_fence_get(head); iter; \ | |
| 64 | iter = dma_fence_chain_walk(iter)) | |
| 65 | ||
| 66 | struct dma_fence *dma_fence_chain_walk(struct dma_fence *fence); | |
| 67 | int dma_fence_chain_find_seqno(struct dma_fence **pfence, uint64_t seqno); | |
| 68 | void dma_fence_chain_init(struct dma_fence_chain *chain, | |
| 69 | struct dma_fence *prev, | |
| 70 | struct dma_fence *fence, | |
| 71 | uint64_t seqno); | |
| 72 | ||
| 73 | #endif /* __LINUX_DMA_FENCE_CHAIN_H */ |