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block: move dma drain handling to scsi

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Don't burden the common block code with with specifics of the libata DMA
draining mechanism.  Instead move most of the code to the scsi midlayer.

That also means the nr_phys_segments adjustments in the blk-mq fast path
can go away entirely, given that SCSI never looks at nr_phys_segments
after mapping the request to a scatterlist.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2020-04-14 09:42:24 +02:00
committed by Jens Axboe
parent 0475bd6c65
commit cc97923a5b
9 changed files with 56 additions and 92 deletions
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7
include/linux/blkdev.h
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@@ -288,7 +288,6 @@ struct blk_queue_ctx;
typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
struct bio_vec;
typedef int (dma_drain_needed_fn)(struct request *);
enum blk_eh_timer_return {
BLK_EH_DONE, /* drivers has completed the command */
@@ -397,7 +396,6 @@ struct request_queue {
struct rq_qos *rq_qos;
make_request_fn *make_request_fn;
dma_drain_needed_fn *dma_drain_needed;
const struct blk_mq_ops *mq_ops;
@@ -467,8 +465,6 @@ struct request_queue {
*/
unsigned long nr_requests; /* Max # of requests */
unsigned int dma_drain_size;
void *dma_drain_buffer;
unsigned int dma_pad_mask;
unsigned int dma_alignment;
@@ -1097,9 +1093,6 @@ extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
sector_t offset);
extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
extern int blk_queue_dma_drain(struct request_queue *q,
dma_drain_needed_fn *dma_drain_needed,
void *buf, unsigned int size);
extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
extern void blk_queue_dma_alignment(struct request_queue *, int);