[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/block/bsg-lib.c b/src/kernel/linux/v4.14/block/bsg-lib.c
new file mode 100644
index 0000000..15d25cc
--- /dev/null
+++ b/src/kernel/linux/v4.14/block/bsg-lib.c
@@ -0,0 +1,294 @@
+/*
+ * 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
+ * @job: 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);
+}
+
+void bsg_job_put(struct bsg_job *job)
+{
+ kref_put(&job->kref, bsg_teardown_job);
+}
+EXPORT_SYMBOL_GPL(bsg_job_put);
+
+int bsg_job_get(struct bsg_job *job)
+{
+ return kref_get_unless_zero(&job->kref);
+}
+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);
+}
+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);
+}
+
+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;
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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);
+}
+
+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;
+}
+
+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;
+}
+
+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);
+}
+
+/**
+ * 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
+ */
+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);
+}
+EXPORT_SYMBOL_GPL(bsg_setup_queue);