Release 4.16 block/bsg-lib.c
/*
* BSG helper library
*
* Copyright (C) 2008 James Smart, Emulex Corporation
* Copyright (C) 2011 Red Hat, Inc. All rights reserved.
* Copyright (C) 2011 Mike Christie
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/scatterlist.h>
#include <linux/bsg-lib.h>
#include <linux/export.h>
#include <scsi/scsi_cmnd.h>
/**
* bsg_teardown_job - routine to teardown a bsg job
* @kref: kref inside bsg_job that is to be torn down
*/
static void bsg_teardown_job(struct kref *kref)
{
struct bsg_job *job = container_of(kref, struct bsg_job, kref);
struct request *rq = job->req;
put_device(job->dev); /* release reference for the request */
kfree(job->request_payload.sg_list);
kfree(job->reply_payload.sg_list);
blk_end_request_all(rq, BLK_STS_OK);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Christie | 37 | 54.41% | 1 | 25.00% |
Johannes Thumshirn | 26 | 38.24% | 2 | 50.00% |
Benjamin Block | 5 | 7.35% | 1 | 25.00% |
Total | 68 | 100.00% | 4 | 100.00% |
void bsg_job_put(struct bsg_job *job)
{
kref_put(&job->kref, bsg_teardown_job);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Johannes Thumshirn | 19 | 95.00% | 1 | 50.00% |
Benjamin Block | 1 | 5.00% | 1 | 50.00% |
Total | 20 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(bsg_job_put);
int bsg_job_get(struct bsg_job *job)
{
return kref_get_unless_zero(&job->kref);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Johannes Thumshirn | 19 | 100.00% | 1 | 100.00% |
Total | 19 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(bsg_job_get);
/**
* bsg_job_done - completion routine for bsg requests
* @job: bsg_job that is complete
* @result: job reply result
* @reply_payload_rcv_len: length of payload recvd
*
* The LLD should call this when the bsg job has completed.
*/
void bsg_job_done(struct bsg_job *job, int result,
unsigned int reply_payload_rcv_len)
{
struct request *req = job->req;
struct request *rsp = req->next_rq;
struct scsi_request *rq = scsi_req(req);
int err;
err = scsi_req(job->req)->result = result;
if (err < 0)
/* we're only returning the result field in the reply */
rq->sense_len = sizeof(u32);
else
rq->sense_len = job->reply_len;
/* we assume all request payload was transferred, residual == 0 */
rq->resid_len = 0;
if (rsp) {
WARN_ON(reply_payload_rcv_len > scsi_req(rsp)->resid_len);
/* set reply (bidi) residual */
scsi_req(rsp)->resid_len -=
min(reply_payload_rcv_len, scsi_req(rsp)->resid_len);
}
blk_complete_request(req);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Christie | 110 | 80.88% | 1 | 33.33% |
Christoph Hellwig | 26 | 19.12% | 2 | 66.67% |
Total | 136 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL_GPL(bsg_job_done);
/**
* bsg_softirq_done - 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)
{
struct bsg_job *job = blk_mq_rq_to_pdu(rq);
bsg_job_put(job);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Christie | 22 | 84.62% | 1 | 33.33% |
Benjamin Block | 3 | 11.54% | 1 | 33.33% |
Johannes Thumshirn | 1 | 3.85% | 1 | 33.33% |
Total | 26 | 100.00% | 3 | 100.00% |
static int bsg_map_buffer(struct bsg_buffer *buf, struct request *req)
{
size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
BUG_ON(!req->nr_phys_segments);
buf->sg_list = kzalloc(sz, GFP_KERNEL);
if (!buf->sg_list)
return -ENOMEM;
sg_init_table(buf->sg_list, req->nr_phys_segments);
scsi_req(req)->resid_len = blk_rq_bytes(req);
buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
buf->payload_len = blk_rq_bytes(req);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Christie | 101 | 89.38% | 1 | 50.00% |
Christoph Hellwig | 12 | 10.62% | 1 | 50.00% |
Total | 113 | 100.00% | 2 | 100.00% |
/**
* bsg_prepare_job - create the bsg_job structure for the bsg request
* @dev: device that is being sent the bsg request
* @req: BSG request that needs a job structure
*/
static int bsg_prepare_job(struct device *dev, struct request *req)
{
struct request *rsp = req->next_rq;
struct scsi_request *rq = scsi_req(req);
struct bsg_job *job = blk_mq_rq_to_pdu(req);
int ret;
job->request = rq->cmd;
job->request_len = rq->cmd_len;
if (req->bio) {
ret = bsg_map_buffer(&job->request_payload, req);
if (ret)
goto failjob_rls_job;
}
if (rsp && rsp->bio) {
ret = bsg_map_buffer(&job->reply_payload, rsp);
if (ret)
goto failjob_rls_rqst_payload;
}
job->dev = dev;
/* take a reference for the request */
get_device(job->dev);
kref_init(&job->kref);
return 0;
failjob_rls_rqst_payload:
kfree(job->request_payload.sg_list);
failjob_rls_job:
return -ENOMEM;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Christie | 136 | 83.95% | 1 | 25.00% |
Christoph Hellwig | 12 | 7.41% | 1 | 25.00% |
Johannes Thumshirn | 8 | 4.94% | 1 | 25.00% |
Benjamin Block | 6 | 3.70% | 1 | 25.00% |
Total | 162 | 100.00% | 4 | 100.00% |
/**
* bsg_request_fn - generic handler for bsg requests
* @q: request queue to manage
*
* 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)
{
struct device *dev = q->queuedata;
struct request *req;
int ret;
if (!get_device(dev))
return;
while (1) {
req = blk_fetch_request(q);
if (!req)
break;
spin_unlock_irq(q->queue_lock);
ret = bsg_prepare_job(dev, req);
if (ret) {
scsi_req(req)->result = ret;
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;
}
spin_unlock_irq(q->queue_lock);
put_device(dev);
spin_lock_irq(q->queue_lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Christie | 134 | 85.35% | 1 | 16.67% |
Bart Van Assche | 12 | 7.64% | 1 | 16.67% |
Christoph Hellwig | 6 | 3.82% | 3 | 50.00% |
Benjamin Block | 5 | 3.18% | 1 | 16.67% |
Total | 157 | 100.00% | 6 | 100.00% |
static int bsg_init_rq(struct request_queue *q, struct request *req, gfp_t gfp)
{
struct bsg_job *job = blk_mq_rq_to_pdu(req);
struct scsi_request *sreq = &job->sreq;
/* called right after the request is allocated for the request_queue */
sreq->sense = kzalloc(SCSI_SENSE_BUFFERSIZE, gfp);
if (!sreq->sense)
return -ENOMEM;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Benjamin Block | 65 | 100.00% | 2 | 100.00% |
Total | 65 | 100.00% | 2 | 100.00% |
static void bsg_initialize_rq(struct request *req)
{
struct bsg_job *job = blk_mq_rq_to_pdu(req);
struct scsi_request *sreq = &job->sreq;
void *sense = sreq->sense;
/* called right before the request is given to the request_queue user */
memset(job, 0, sizeof(*job));
scsi_req_init(sreq);
sreq->sense = sense;
sreq->sense_len = SCSI_SENSE_BUFFERSIZE;
job->req = req;
job->reply = sense;
job->reply_len = sreq->sense_len;
job->dd_data = job + 1;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Benjamin Block | 98 | 100.00% | 2 | 100.00% |
Total | 98 | 100.00% | 2 | 100.00% |
static void bsg_exit_rq(struct request_queue *q, struct request *req)
{
struct bsg_job *job = blk_mq_rq_to_pdu(req);
struct scsi_request *sreq = &job->sreq;
kfree(sreq->sense);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Benjamin Block | 43 | 100.00% | 1 | 100.00% |
Total | 43 | 100.00% | 1 | 100.00% |
/**
* bsg_setup_queue - Create and add the bsg hooks so we can receive requests
* @dev: device to attach bsg device to
* @name: device to give bsg device
* @job_fn: bsg job handler
* @dd_job_size: size of LLD data needed for each job
* @release: @dev release function
*/
struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
bsg_job_fn *job_fn, int dd_job_size,
void (*release)(struct device *))
{
struct request_queue *q;
int ret;
q = blk_alloc_queue(GFP_KERNEL);
if (!q)
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;
q->queuedata = dev;
q->bsg_job_fn = job_fn;
queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
queue_flag_set_unlocked(QUEUE_FLAG_SCSI_PASSTHROUGH, q);
blk_queue_softirq_done(q, bsg_softirq_done);
blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
ret = bsg_register_queue(q, dev, name, release);
if (ret) {
printk(KERN_ERR "%s: bsg interface failed to "
"initialize - register queue\n", dev->kobj.name);
goto out_cleanup_queue;
}
return q;
out_cleanup_queue:
blk_cleanup_queue(q);
return ERR_PTR(ret);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Christie | 89 | 43.84% | 1 | 14.29% |
Christoph Hellwig | 86 | 42.36% | 3 | 42.86% |
Benjamin Block | 21 | 10.34% | 2 | 28.57% |
Bart Van Assche | 7 | 3.45% | 1 | 14.29% |
Total | 203 | 100.00% | 7 | 100.00% |
EXPORT_SYMBOL_GPL(bsg_setup_queue);
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Christie | 660 | 56.99% | 1 | 6.25% |
Benjamin Block | 248 | 21.42% | 2 | 12.50% |
Christoph Hellwig | 143 | 12.35% | 5 | 31.25% |
Johannes Thumshirn | 83 | 7.17% | 3 | 18.75% |
Bart Van Assche | 21 | 1.81% | 3 | 18.75% |
Jens Axboe | 2 | 0.17% | 1 | 6.25% |
Paul Gortmaker | 1 | 0.09% | 1 | 6.25% |
Total | 1158 | 100.00% | 16 | 100.00% |
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