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| author | Christoph Hellwig <hch@lst.de> | 2020-04-14 09:42:24 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-04-22 10:47:35 -0600 |
| commit | cc97923a5bccc776851c242b61015faf288d5c22 (patch) | |
| tree | d6510d4f326674e96bdf70c4f07472f492537db8 /include/scsi/scsi_host.h | |
| parent | 0475bd6c65976c390e3805a1e5f10fc30ca8def2 (diff) | |
| download | linux-cc97923a5bccc776851c242b61015faf288d5c22.tar.gz linux-cc97923a5bccc776851c242b61015faf288d5c22.tar.bz2 linux-cc97923a5bccc776851c242b61015faf288d5c22.zip | |
block: move dma drain handling to scsi
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>
Diffstat (limited to 'include/scsi/scsi_host.h')
| -rw-r--r-- | include/scsi/scsi_host.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 822e8cda8d9b..46ef8cccc982 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -271,6 +271,13 @@ 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 * the host adapter. Parameters: |