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author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-12 14:30:53 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-12 14:30:53 -0800 |
commit | 8494bcf5b7c4b2416687e233dd34d4c6b6fe5653 (patch) | |
tree | cebb468e170e639ecfd61ddc5ebcba86c21105fa /drivers/ata/libata-scsi.c | |
parent | 3e12cefbe143b4947171ff92dd50024c4841e291 (diff) | |
parent | b042a3ca949053231950a1b15f31cccca9e305f3 (diff) | |
download | linux-8494bcf5b7c4b2416687e233dd34d4c6b6fe5653.tar.gz |
Merge branch 'for-3.20/drivers' of git://git.kernel.dk/linux-block
Pull block driver changes from Jens Axboe: "This contains: - The 4k/partition fixes for brd from Boaz/Matthew. - A few xen front/back block fixes from David Vrabel and Roger Pau Monne. - Floppy changes from Takashi, cleaning the device file creation. - Switching libata to use the new blk-mq tagging policy, removing code (and a suboptimal implementation) from libata. This will throw you a merge conflict, since a bug in the original libata tagging code was fixed since this code was branched. Trivial. From Shaohua. - Conversion of loop to blk-mq, from Ming Lei. - Cleanup of the io_schedule() handling in bsg from Peter Zijlstra. He claims it improves on unreadable code, which will cost him a beer. - Maintainer update or NDB, now handled by Markus Pargmann. - NVMe: - Optimization from me that avoids a kmalloc/kfree per IO for smaller (<= 8KB) IO. This cuts about 1% of high IOPS CPU overhead. - Removal of (now) dead RCU code, a relic from before NVMe was converted to blk-mq" * 'for-3.20/drivers' of git://git.kernel.dk/linux-block: xen-blkback: default to X86_32 ABI on x86 xen-blkfront: fix accounting of reqs when migrating xen-blkback,xen-blkfront: add myself as maintainer block: Simplify bsg complete all floppy: Avoid manual call of device_create_file() NVMe: avoid kmalloc/kfree for smaller IO MAINTAINERS: Update NBD maintainer libata: make sata_sil24 use fifo tag allocator libata: move sas ata tag allocation to libata-scsi.c libata: use blk taging NVMe: within nvme_free_queues(), delete RCU sychro/deferred free null_blk: suppress invalid partition info brd: Request from fdisk 4k alignment brd: Fix all partitions BUGs axonram: Fix bug in direct_access loop: add blk-mq.h include block: loop: don't handle REQ_FUA explicitly block: loop: introduce lo_discard() and lo_req_flush() block: loop: say goodby to bio block: loop: improve performance via blk-mq
Diffstat (limited to 'drivers/ata/libata-scsi.c')
-rw-r--r-- | drivers/ata/libata-scsi.c | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 280729325ebd..b061ba2c31d8 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -756,7 +756,7 @@ static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, { struct ata_queued_cmd *qc; - qc = ata_qc_new_init(dev); + qc = ata_qc_new_init(dev, cmd->request->tag); if (qc) { qc->scsicmd = cmd; qc->scsidone = cmd->scsi_done; @@ -3668,6 +3668,9 @@ int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) */ shost->max_host_blocked = 1; + if (scsi_init_shared_tag_map(shost, host->n_tags)) + goto err_add; + rc = scsi_add_host_with_dma(ap->scsi_host, &ap->tdev, ap->host->dev); if (rc) @@ -4230,3 +4233,31 @@ int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) return rc; } EXPORT_SYMBOL_GPL(ata_sas_queuecmd); + +int ata_sas_allocate_tag(struct ata_port *ap) +{ + unsigned int max_queue = ap->host->n_tags; + unsigned int i, tag; + + for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) { + if (ap->flags & ATA_FLAG_LOWTAG) + tag = 1; + else + tag = tag < max_queue ? tag : 0; + + /* the last tag is reserved for internal command. */ + if (tag == ATA_TAG_INTERNAL) + continue; + + if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) { + ap->sas_last_tag = tag; + return tag; + } + } + return -1; +} + +void ata_sas_free_tag(unsigned int tag, struct ata_port *ap) +{ + clear_bit(tag, &ap->sas_tag_allocated); +} |