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| author | John Garry <john.garry@huawei.com> | 2020-08-19 23:20:33 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-10-06 08:33:44 -0600 |
| commit | f7c4cdc712ab803f7cdd3d47025081831f457ecc (patch) | |
| tree | 6743cc4a2cbfb080b33c2463d4c9dff7ecd1afad /drivers/scsi | |
| parent | 8d98416a55ebfecbe57fd26981decf6fcdf37b11 (diff) | |
| download | linux-f7c4cdc712ab803f7cdd3d47025081831f457ecc.tar.bz2 | |
scsi: scsi_debug: Support host tagset
When host_max_queue is set (> 0), set the Scsi_Host.host_tagset such that
blk-mq will use a hostwide tagset over all SCSI host submission queues.
This means that we may expose all submission queues and always use the hwq
chosen by blk-mq.
And since if sdebug_host_max_queue is set, sdebug_max_queue is fixed to the
same value, we can simplify how sdebug_driver_template.can_queue is set.
Signed-off-by: John Garry <john.garry@huawei.com>
Tested-by: Douglas Gilbert <dgilbert@interlog.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/scsi_debug.c | 28 |
1 files changed, 10 insertions, 18 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 1ad7260d4758..a87e40aec11f 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -4696,19 +4696,14 @@ fini: static struct sdebug_queue *get_queue(struct scsi_cmnd *cmnd) { u16 hwq; + u32 tag = blk_mq_unique_tag(cmnd->request); - if (sdebug_host_max_queue) { - /* Provide a simple method to choose the hwq */ - hwq = smp_processor_id() % submit_queues; - } else { - u32 tag = blk_mq_unique_tag(cmnd->request); + hwq = blk_mq_unique_tag_to_hwq(tag); - hwq = blk_mq_unique_tag_to_hwq(tag); + pr_debug("tag=%#x, hwq=%d\n", tag, hwq); + if (WARN_ON_ONCE(hwq >= submit_queues)) + hwq = 0; - pr_debug("tag=%#x, hwq=%d\n", tag, hwq); - if (WARN_ON_ONCE(hwq >= submit_queues)) - hwq = 0; - } return sdebug_q_arr + hwq; } @@ -7347,10 +7342,7 @@ static int sdebug_driver_probe(struct device *dev) sdbg_host = to_sdebug_host(dev); - if (sdebug_host_max_queue) - sdebug_driver_template.can_queue = sdebug_host_max_queue; - else - sdebug_driver_template.can_queue = sdebug_max_queue; + sdebug_driver_template.can_queue = sdebug_max_queue; if (!sdebug_clustering) sdebug_driver_template.dma_boundary = PAGE_SIZE - 1; @@ -7367,11 +7359,11 @@ static int sdebug_driver_probe(struct device *dev) } /* * Decide whether to tell scsi subsystem that we want mq. The - * following should give the same answer for each host. If the host - * has a limit of hostwide max commands, then do not set. + * following should give the same answer for each host. */ - if (!sdebug_host_max_queue) - hpnt->nr_hw_queues = submit_queues; + hpnt->nr_hw_queues = submit_queues; + if (sdebug_host_max_queue) + hpnt->host_tagset = 1; sdbg_host->shost = hpnt; *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host; |