diff options
Diffstat (limited to 'drivers/dma/ioat/dma_v2.h')
| -rw-r--r-- | drivers/dma/ioat/dma_v2.h | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h index ef2871fd7868..d7b64f188f78 100644 --- a/drivers/dma/ioat/dma_v2.h +++ b/drivers/dma/ioat/dma_v2.h @@ -22,6 +22,7 @@ #define IOATDMA_V2_H #include <linux/dmaengine.h> +#include <linux/circ_buf.h> #include "dma.h" #include "hw.h" @@ -71,31 +72,26 @@ static inline struct ioat2_dma_chan *to_ioat2_chan(struct dma_chan *c) return container_of(chan, struct ioat2_dma_chan, base); } -static inline u16 ioat2_ring_mask(struct ioat2_dma_chan *ioat) +static inline u16 ioat2_ring_size(struct ioat2_dma_chan *ioat) { - return (1 << ioat->alloc_order) - 1; + return 1 << ioat->alloc_order; } /* count of descriptors in flight with the engine */ static inline u16 ioat2_ring_active(struct ioat2_dma_chan *ioat) { - return (ioat->head - ioat->tail) & ioat2_ring_mask(ioat); + return CIRC_CNT(ioat->head, ioat->tail, ioat2_ring_size(ioat)); } /* count of descriptors pending submission to hardware */ static inline u16 ioat2_ring_pending(struct ioat2_dma_chan *ioat) { - return (ioat->head - ioat->issued) & ioat2_ring_mask(ioat); + return CIRC_CNT(ioat->head, ioat->issued, ioat2_ring_size(ioat)); } static inline u16 ioat2_ring_space(struct ioat2_dma_chan *ioat) { - u16 num_descs = ioat2_ring_mask(ioat) + 1; - u16 active = ioat2_ring_active(ioat); - - BUG_ON(active > num_descs); - - return num_descs - active; + return ioat2_ring_size(ioat) - ioat2_ring_active(ioat); } /* assumes caller already checked space */ @@ -151,7 +147,7 @@ struct ioat_ring_ent { static inline struct ioat_ring_ent * ioat2_get_ring_ent(struct ioat2_dma_chan *ioat, u16 idx) { - return ioat->ring[idx & ioat2_ring_mask(ioat)]; + return ioat->ring[idx & (ioat2_ring_size(ioat) - 1)]; } static inline void ioat2_set_chainaddr(struct ioat2_dma_chan *ioat, u64 addr) |
