projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 |