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bsg: convert to use blk-mq
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Requires a few changes to the FC transport class as well.

Cc: [email protected]
Reviewed-by: Hannes Reinecke <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Tested-by: Benjamin Block <[email protected]>
Tested-by: Ming Lei <[email protected]>
Reviewed-by: Omar Sandoval <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
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@axboe
axboe committed Nov 7, 2018
1 parent 5e28b8d commit cd2f076
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Showing 2 changed files with 110 additions and 72 deletions.
123 changes: 75 additions & 48 deletions block/bsg-lib.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,7 @@
*
*/
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#include <linux/delay.h>
#include <linux/scatterlist.h>
#include <linux/bsg-lib.h>
Expand Down Expand Up @@ -129,7 +129,7 @@ static void bsg_teardown_job(struct kref *kref)
kfree(job->request_payload.sg_list);
kfree(job->reply_payload.sg_list);

blk_end_request_all(rq, BLK_STS_OK);
blk_mq_end_request(rq, BLK_STS_OK);
}

void bsg_job_put(struct bsg_job *job)
Expand Down Expand Up @@ -157,15 +157,15 @@ void bsg_job_done(struct bsg_job *job, int result,
{
job->result = result;
job->reply_payload_rcv_len = reply_payload_rcv_len;
blk_complete_request(blk_mq_rq_from_pdu(job));
blk_mq_complete_request(blk_mq_rq_from_pdu(job));
}
EXPORT_SYMBOL_GPL(bsg_job_done);

/**
* bsg_softirq_done - softirq done routine for destroying the bsg requests
* bsg_complete - softirq done routine for destroying the bsg requests
* @rq: BSG request that holds the job to be destroyed
*/
static void bsg_softirq_done(struct request *rq)
static void bsg_complete(struct request *rq)
{
struct bsg_job *job = blk_mq_rq_to_pdu(rq);

Expand Down Expand Up @@ -224,54 +224,46 @@ static bool bsg_prepare_job(struct device *dev, struct request *req)
}

/**
* bsg_request_fn - generic handler for bsg requests
* @q: request queue to manage
* bsg_queue_rq - generic handler for bsg requests
* @hctx: hardware queue
* @bd: queue data
*
* On error the create_bsg_job function should return a -Exyz error value
* that will be set to ->result.
*
* Drivers/subsys should pass this to the queue init function.
*/
static void bsg_request_fn(struct request_queue *q)
__releases(q->queue_lock)
__acquires(q->queue_lock)
static blk_status_t bsg_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
struct request_queue *q = hctx->queue;
struct device *dev = q->queuedata;
struct request *req;
struct request *req = bd->rq;
int ret;

blk_mq_start_request(req);

if (!get_device(dev))
return;

while (1) {
req = blk_fetch_request(q);
if (!req)
break;
spin_unlock_irq(q->queue_lock);

if (!bsg_prepare_job(dev, req)) {
blk_end_request_all(req, BLK_STS_OK);
spin_lock_irq(q->queue_lock);
continue;
}

ret = q->bsg_job_fn(blk_mq_rq_to_pdu(req));
spin_lock_irq(q->queue_lock);
if (ret)
break;
}
return BLK_STS_IOERR;

if (!bsg_prepare_job(dev, req))
return BLK_STS_IOERR;

ret = q->bsg_job_fn(blk_mq_rq_to_pdu(req));
if (ret)
return BLK_STS_IOERR;

spin_unlock_irq(q->queue_lock);
put_device(dev);
spin_lock_irq(q->queue_lock);
return BLK_STS_OK;
}

/* called right after the request is allocated for the request_queue */
static int bsg_init_rq(struct request_queue *q, struct request *req, gfp_t gfp)
static int bsg_init_rq(struct blk_mq_tag_set *set, struct request *req,
unsigned int hctx_idx, unsigned int numa_node)
{
struct bsg_job *job = blk_mq_rq_to_pdu(req);

job->reply = kzalloc(SCSI_SENSE_BUFFERSIZE, gfp);
job->reply = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
if (!job->reply)
return -ENOMEM;
return 0;
Expand All @@ -289,7 +281,8 @@ static void bsg_initialize_rq(struct request *req)
job->dd_data = job + 1;
}

static void bsg_exit_rq(struct request_queue *q, struct request *req)
static void bsg_exit_rq(struct blk_mq_tag_set *set, struct request *req,
unsigned int hctx_idx)
{
struct bsg_job *job = blk_mq_rq_to_pdu(req);

Expand All @@ -299,12 +292,36 @@ static void bsg_exit_rq(struct request_queue *q, struct request *req)
void bsg_remove_queue(struct request_queue *q)
{
if (q) {
struct blk_mq_tag_set *set = q->tag_set;

bsg_unregister_queue(q);
blk_cleanup_queue(q);
blk_mq_free_tag_set(set);
kfree(set);
}
}
EXPORT_SYMBOL_GPL(bsg_remove_queue);

static enum blk_eh_timer_return bsg_timeout(struct request *rq, bool reserved)
{
enum blk_eh_timer_return ret = BLK_EH_DONE;
struct request_queue *q = rq->q;

if (q->rq_timed_out_fn)
ret = q->rq_timed_out_fn(rq);

return ret;
}

static const struct blk_mq_ops bsg_mq_ops = {
.queue_rq = bsg_queue_rq,
.init_request = bsg_init_rq,
.exit_request = bsg_exit_rq,
.initialize_rq_fn = bsg_initialize_rq,
.complete = bsg_complete,
.timeout = bsg_timeout,
};

/**
* bsg_setup_queue - Create and add the bsg hooks so we can receive requests
* @dev: device to attach bsg device to
Expand All @@ -315,28 +332,34 @@ EXPORT_SYMBOL_GPL(bsg_remove_queue);
struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
bsg_job_fn *job_fn, rq_timed_out_fn *timeout, int dd_job_size)
{
struct blk_mq_tag_set *set;
struct request_queue *q;
int ret;
int ret = -ENOMEM;

q = blk_alloc_queue(GFP_KERNEL);
if (!q)
set = kzalloc(sizeof(*set), GFP_KERNEL);
if (!set)
return ERR_PTR(-ENOMEM);
q->cmd_size = sizeof(struct bsg_job) + dd_job_size;
q->init_rq_fn = bsg_init_rq;
q->exit_rq_fn = bsg_exit_rq;
q->initialize_rq_fn = bsg_initialize_rq;
q->request_fn = bsg_request_fn;

ret = blk_init_allocated_queue(q);
if (ret)
goto out_cleanup_queue;
set->ops = &bsg_mq_ops,
set->nr_hw_queues = 1;
set->queue_depth = 128;
set->numa_node = NUMA_NO_NODE;
set->cmd_size = sizeof(struct bsg_job) + dd_job_size;
set->flags = BLK_MQ_F_NO_SCHED | BLK_MQ_F_BLOCKING;
if (blk_mq_alloc_tag_set(set))
goto out_tag_set;

q = blk_mq_init_queue(set);
if (IS_ERR(q)) {
ret = PTR_ERR(q);
goto out_queue;
}

q->queuedata = dev;
q->bsg_job_fn = job_fn;
blk_queue_flag_set(QUEUE_FLAG_BIDI, q);
blk_queue_softirq_done(q, bsg_softirq_done);
blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
blk_queue_rq_timed_out(q, timeout);
q->rq_timed_out_fn = timeout;

ret = bsg_register_queue(q, dev, name, &bsg_transport_ops);
if (ret) {
Expand All @@ -348,6 +371,10 @@ struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
return q;
out_cleanup_queue:
blk_cleanup_queue(q);
out_queue:
blk_mq_free_tag_set(set);
out_tag_set:
kfree(set);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(bsg_setup_queue);
59 changes: 35 additions & 24 deletions drivers/scsi/scsi_transport_fc.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -3592,7 +3592,7 @@ fc_bsg_job_timeout(struct request *req)

/* the blk_end_sync_io() doesn't check the error */
if (inflight)
__blk_complete_request(req);
blk_mq_end_request(req, BLK_STS_IOERR);
return BLK_EH_DONE;
}

Expand Down Expand Up @@ -3684,14 +3684,9 @@ static void
fc_bsg_goose_queue(struct fc_rport *rport)
{
struct request_queue *q = rport->rqst_q;
unsigned long flags;

if (!q)
return;

spin_lock_irqsave(q->queue_lock, flags);
blk_run_queue_async(q);
spin_unlock_irqrestore(q->queue_lock, flags);
if (q)
blk_mq_run_hw_queues(q, true);
}

/**
Expand Down Expand Up @@ -3759,6 +3754,37 @@ static int fc_bsg_dispatch(struct bsg_job *job)
return fc_bsg_host_dispatch(shost, job);
}

static blk_status_t fc_bsg_rport_prep(struct fc_rport *rport)
{
if (rport->port_state == FC_PORTSTATE_BLOCKED &&
!(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
return BLK_STS_RESOURCE;

if (rport->port_state != FC_PORTSTATE_ONLINE)
return BLK_STS_IOERR;

return BLK_STS_OK;
}


static int fc_bsg_dispatch_prep(struct bsg_job *job)
{
struct fc_rport *rport = fc_bsg_to_rport(job);
blk_status_t ret;

ret = fc_bsg_rport_prep(rport);
switch (ret) {
case BLK_STS_OK:
break;
case BLK_STS_RESOURCE:
return -EAGAIN;
default:
return -EIO;
}

return fc_bsg_dispatch(job);
}

/**
* fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
* @shost: shost for fc_host
Expand Down Expand Up @@ -3794,20 +3820,6 @@ fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
return 0;
}

static int fc_bsg_rport_prep(struct request_queue *q, struct request *req)
{
struct fc_rport *rport = dev_to_rport(q->queuedata);

if (rport->port_state == FC_PORTSTATE_BLOCKED &&
!(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
return BLKPREP_DEFER;

if (rport->port_state != FC_PORTSTATE_ONLINE)
return BLKPREP_KILL;

return BLKPREP_OK;
}

/**
* fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
* @shost: shost that rport is attached to
Expand All @@ -3825,14 +3837,13 @@ fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
if (!i->f->bsg_request)
return -ENOTSUPP;

q = bsg_setup_queue(dev, dev_name(dev), fc_bsg_dispatch,
q = bsg_setup_queue(dev, dev_name(dev), fc_bsg_dispatch_prep,
fc_bsg_job_timeout, i->f->dd_bsg_size);
if (IS_ERR(q)) {
dev_err(dev, "failed to setup bsg queue\n");
return PTR_ERR(q);
}
__scsi_init_queue(shost, q);
blk_queue_prep_rq(q, fc_bsg_rport_prep);
blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
rport->rqst_q = q;
return 0;
Expand Down

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