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ioat: convert to circ_buf 

Use the common power-of-2 circular buffer macros.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2010-05-01 15:22:54 -07:00
parent 0d0fb0f9c5
commit abb12dfd50
2 changed files with 8 additions and 12 deletions
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2
drivers/dma/ioat/dma_v2.c
View File

@ -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;

18
drivers/dma/ioat/dma_v2.h
View File

@ -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)