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authorDan Williams <dan.j.williams@intel.com>2010-05-01 15:22:54 -0700
committerDan Williams <dan.j.williams@intel.com>2010-05-01 15:22:54 -0700
commitabb12dfd50c7580d7dcbd581cf6265ba4d01ea7e (patch)
treed774315dd2620028f1801c8ec0ec31b0e78a536d /drivers/dma
parent0d0fb0f9c5fddef4a10242fe3337f00f528a3099 (diff)
ioat: convert to circ_buf
Use the common power-of-2 circular buffer macros. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/ioat/dma_v2.c2
-rw-r--r--drivers/dma/ioat/dma_v2.h18
2 files changed, 8 insertions, 12 deletions
diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c
index b5ae56c211e..b6699a35098 100644
--- a/drivers/dma/ioat/dma_v2.c
+++ b/drivers/dma/ioat/dma_v2.c
@@ -553,7 +553,7 @@ bool reshape_ring(struct ioat2_dma_chan *ioat, int order)
*/
struct ioat_chan_common *chan = &ioat->base;
struct dma_chan *c = &chan->common;
- const u16 curr_size = ioat2_ring_mask(ioat) + 1;
+ const u16 curr_size = ioat2_ring_size(ioat);
const u16 active = ioat2_ring_active(ioat);
const u16 new_size = 1 << order;
struct ioat_ring_ent **ring;
diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h
index ef2871fd786..d7b64f188f7 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)