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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/scsi/scsi_host.h
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@@ -270,6 +270,13 @@ struct scsi_host_template {
*/
int (* map_queues)(struct Scsi_Host *shost);
/*
* Check if scatterlists need to be padded for DMA draining.
*
* Status: OPTIONAL
*/
bool (* dma_need_drain)(struct request *rq);
/*
* This function determines the BIOS parameters for a given
* harddisk. These tend to be numbers that are made up by