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d2ebfb33 RKAL |
1 | /* |
2 | * The contents of this file are private to DMA engine drivers, and is not | |
3 | * part of the API to be used by DMA engine users. | |
4 | */ | |
5 | #ifndef DMAENGINE_H | |
6 | #define DMAENGINE_H | |
7 | ||
f7fbce07 | 8 | #include <linux/bug.h> |
d2ebfb33 RKAL |
9 | #include <linux/dmaengine.h> |
10 | ||
884485e1 RKAL |
11 | /** |
12 | * dma_cookie_assign - assign a DMA engine cookie to the descriptor | |
13 | * @tx: descriptor needing cookie | |
14 | * | |
15 | * Assign a unique non-zero per-channel cookie to the descriptor. | |
16 | * Note: caller is expected to hold a lock to prevent concurrency. | |
17 | */ | |
18 | static inline dma_cookie_t dma_cookie_assign(struct dma_async_tx_descriptor *tx) | |
19 | { | |
20 | struct dma_chan *chan = tx->chan; | |
21 | dma_cookie_t cookie; | |
22 | ||
23 | cookie = chan->cookie + 1; | |
24 | if (cookie < DMA_MIN_COOKIE) | |
25 | cookie = DMA_MIN_COOKIE; | |
26 | tx->cookie = chan->cookie = cookie; | |
27 | ||
28 | return cookie; | |
29 | } | |
30 | ||
f7fbce07 RKAL |
31 | /** |
32 | * dma_cookie_complete - complete a descriptor | |
33 | * @tx: descriptor to complete | |
34 | * | |
35 | * Mark this descriptor complete by updating the channels completed | |
36 | * cookie marker. Zero the descriptors cookie to prevent accidental | |
37 | * repeated completions. | |
38 | * | |
39 | * Note: caller is expected to hold a lock to prevent concurrency. | |
40 | */ | |
41 | static inline void dma_cookie_complete(struct dma_async_tx_descriptor *tx) | |
42 | { | |
43 | BUG_ON(tx->cookie < DMA_MIN_COOKIE); | |
44 | tx->chan->completed_cookie = tx->cookie; | |
45 | tx->cookie = 0; | |
46 | } | |
47 | ||
d2ebfb33 | 48 | #endif |