return &pt->pscsi_task;
}
-static inline void pscsi_blk_init_request(
- struct se_task *task,
- struct pscsi_plugin_task *pt,
- struct request *req,
- int bidi_read)
-{
- /*
- * Defined as "scsi command" in include/linux/blkdev.h.
- */
- req->cmd_type = REQ_TYPE_BLOCK_PC;
- /*
- * For the extra BIDI-COMMAND READ struct request we do not
- * need to setup the remaining structure members
- */
- if (bidi_read)
- return;
- /*
- * Setup the done function pointer for struct request,
- * also set the end_io_data pointer.to struct se_task.
- */
- req->end_io = pscsi_req_done;
- req->end_io_data = task;
- /*
- * Load the referenced struct se_task's SCSI CDB into
- * include/linux/blkdev.h:struct request->cmd
- */
- req->cmd_len = scsi_command_size(pt->pscsi_cdb);
- req->cmd = &pt->pscsi_cdb[0];
- /*
- * Setup pointer for outgoing sense data.
- */
- req->sense = &pt->pscsi_sense[0];
- req->sense_len = 0;
-}
-
-/*
- * Used for pSCSI data payloads for all *NON* SCF_SCSI_DATA_SG_IO_CDB
-*/
-static int pscsi_blk_get_request(struct se_task *task)
-{
- struct pscsi_plugin_task *pt = PSCSI_TASK(task);
- struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
-
- pt->pscsi_req = blk_get_request(pdv->pdv_sd->request_queue,
- (task->task_data_direction == DMA_TO_DEVICE),
- GFP_KERNEL);
- if (!pt->pscsi_req || IS_ERR(pt->pscsi_req)) {
- pr_err("PSCSI: blk_get_request() failed: %ld\n",
- IS_ERR(pt->pscsi_req));
- return PYX_TRANSPORT_LU_COMM_FAILURE;
- }
- /*
- * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
- * and setup rq callback, CDB and sense.
- */
- pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
- return 0;
-}
-
-/* pscsi_do_task(): (Part of se_subsystem_api_t template)
- *
- *
- */
-static int pscsi_do_task(struct se_task *task)
-{
- struct pscsi_plugin_task *pt = PSCSI_TASK(task);
- struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
- /*
- * Set the struct request->timeout value based on peripheral
- * device type from SCSI.
- */
- if (pdv->pdv_sd->type == TYPE_DISK)
- pt->pscsi_req->timeout = PS_TIMEOUT_DISK;
- else
- pt->pscsi_req->timeout = PS_TIMEOUT_OTHER;
-
- pt->pscsi_req->retries = PS_RETRY;
- /*
- * Queue the struct request into the struct scsi_device->request_queue.
- * Also check for HEAD_OF_QUEUE SAM TASK attr from received se_cmd
- * descriptor
- */
- blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, pt->pscsi_req,
- (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG),
- pscsi_req_done);
-
- return PYX_TRANSPORT_SENT_TO_TRANSPORT;
-}
-
static void pscsi_free_task(struct se_task *task)
{
struct pscsi_plugin_task *pt = PSCSI_TASK(task);
return bio;
}
-static int __pscsi_map_SG(
- struct se_task *task,
- struct scatterlist *task_sg,
- u32 task_sg_num,
- int bidi_read)
+static int pscsi_map_sg(struct se_task *task, struct scatterlist *task_sg,
+ struct bio **hbio)
{
- struct pscsi_plugin_task *pt = PSCSI_TASK(task);
struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
- struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
+ u32 task_sg_num = task->task_sg_nents;
+ struct bio *bio = NULL, *tbio = NULL;
struct page *page;
struct scatterlist *sg;
u32 data_len = task->task_size, i, len, bytes, off;
int nr_vecs = 0, rc, ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
int rw = (task->task_data_direction == DMA_TO_DEVICE);
- if (!task->task_size)
- return 0;
- /*
- * For SCF_SCSI_DATA_SG_IO_CDB, Use fs/bio.c:bio_add_page() to setup
- * the bio_vec maplist from task->task_sg ->
- * struct scatterlist memory. The struct se_task->task_sg[] currently needs
- * to be attached to struct bios for submission to Linux/SCSI using
- * struct request to struct scsi_device->request_queue.
- *
- * Note that this will be changing post v2.6.28 as Target_Core_Mod/pSCSI
- * is ported to upstream SCSI passthrough functionality that accepts
- * struct scatterlist->page_link or struct page as a paraemeter.
- */
+ *hbio = NULL;
+
pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
for_each_sg(task_sg, sg, task_sg_num, i) {
* bios need to be added to complete a given
* struct se_task
*/
- if (!hbio)
- hbio = tbio = bio;
+ if (!*hbio)
+ *hbio = tbio = bio;
else
tbio = tbio->bi_next = bio;
}
off = 0;
}
}
- /*
- * Setup the primary pt->pscsi_req used for non BIDI and BIDI-COMMAND
- * primary SCSI WRITE poayload mapped for struct se_task->task_sg[]
- */
- if (!bidi_read) {
- /*
- * Starting with v2.6.31, call blk_make_request() passing in *hbio to
- * allocate the pSCSI task a struct request.
- */
- pt->pscsi_req = blk_make_request(pdv->pdv_sd->request_queue,
- hbio, GFP_KERNEL);
- if (!pt->pscsi_req) {
- pr_err("pSCSI: blk_make_request() failed\n");
- goto fail;
- }
- /*
- * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
- * and setup rq callback, CDB and sense.
- */
- pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
-
- return task->task_sg_nents;
- }
- /*
- * Setup the secondary pt->pscsi_req->next_rq used for the extra BIDI-COMMAND
- * SCSI READ paylaod mapped for struct se_task->task_sg_bidi[]
- */
- pt->pscsi_req->next_rq = blk_make_request(pdv->pdv_sd->request_queue,
- hbio, GFP_KERNEL);
- if (!pt->pscsi_req->next_rq) {
- pr_err("pSCSI: blk_make_request() failed for BIDI\n");
- goto fail;
- }
- pscsi_blk_init_request(task, pt, pt->pscsi_req->next_rq, 1);
return task->task_sg_nents;
fail:
- while (hbio) {
- bio = hbio;
- hbio = hbio->bi_next;
+ while (*hbio) {
+ bio = *hbio;
+ *hbio = (*hbio)->bi_next;
bio->bi_next = NULL;
- bio_endio(bio, 0);
+ bio_endio(bio, 0); /* XXX: should be error */
}
return ret;
}
-/*
- * pSCSI maps both ->map_control_SG() and ->map_data_SG() to a single call.
- */
-static int pscsi_map_SG(struct se_task *task)
+static int pscsi_do_task(struct se_task *task)
{
+ struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
+ struct pscsi_plugin_task *pt = PSCSI_TASK(task);
+ struct request *req;
+ struct bio *hbio;
int ret;
- /*
- * Setup the main struct request for the task->task_sg[] payload
- */
+ if (task->task_se_cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
+ req = blk_get_request(pdv->pdv_sd->request_queue,
+ (task->task_data_direction == DMA_TO_DEVICE),
+ GFP_KERNEL);
+ if (!req || IS_ERR(req)) {
+ pr_err("PSCSI: blk_get_request() failed: %ld\n",
+ req ? IS_ERR(req) : -ENOMEM);
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+ }
+ } else {
+ BUG_ON(!task->task_size);
- ret = __pscsi_map_SG(task, task->task_sg, task->task_sg_nents, 0);
- if (ret >= 0 && task->task_sg_bidi) {
/*
- * If present, set up the extra BIDI-COMMAND SCSI READ
- * struct request and payload.
+ * Setup the main struct request for the task->task_sg[] payload
*/
- ret = __pscsi_map_SG(task, task->task_sg_bidi,
- task->task_sg_nents, 1);
+ ret = pscsi_map_sg(task, task->task_sg, &hbio);
+ if (ret < 0)
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+
+ req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
+ GFP_KERNEL);
+ if (!req) {
+ pr_err("pSCSI: blk_make_request() failed\n");
+ goto fail;
+ }
+
+ if (task->task_sg_bidi) {
+ /*
+ * If present, set up the extra BIDI-COMMAND SCSI READ
+ * struct request and payload.
+ */
+ ret = pscsi_map_sg(task, task->task_sg_bidi, &hbio);
+ if (ret < 0) {
+ /* XXX: free the main request? */
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+ }
+
+ /*
+ * Setup the secondary pt->pscsi_req->next_rq used for the extra
+ * BIDI READ payload.
+ */
+ req->next_rq = blk_make_request(pdv->pdv_sd->request_queue,
+ hbio, GFP_KERNEL);
+ if (!req) {
+ pr_err("pSCSI: blk_make_request() failed for BIDI\n");
+ /* XXX: free the main request? */
+ goto fail;
+ }
+
+ req->next_rq->cmd_type = REQ_TYPE_BLOCK_PC;
+ }
}
- if (ret < 0)
- return PYX_TRANSPORT_LU_COMM_FAILURE;
- return 0;
-}
+ req->cmd_type = REQ_TYPE_BLOCK_PC;
+ req->end_io = pscsi_req_done;
+ req->end_io_data = task;
+ req->cmd_len = scsi_command_size(pt->pscsi_cdb);
+ req->cmd = &pt->pscsi_cdb[0];
+ req->sense = &pt->pscsi_sense[0];
+ req->sense_len = 0;
+ if (pdv->pdv_sd->type == TYPE_DISK)
+ req->timeout = PS_TIMEOUT_DISK;
+ else
+ req->timeout = PS_TIMEOUT_OTHER;
+ req->retries = PS_RETRY;
-static int pscsi_CDB_none(struct se_task *task)
-{
- return pscsi_blk_get_request(task);
+ blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
+ (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG),
+ pscsi_req_done);
+
+ return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+
+fail:
+ while (hbio) {
+ struct bio *bio = hbio;
+ hbio = hbio->bi_next;
+ bio->bi_next = NULL;
+ bio_endio(bio, 0); /* XXX: should be error */
+ }
+ return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
}
+
/* pscsi_get_cdb():
*
*
__blk_put_request(req->q, req->next_rq);
__blk_put_request(req->q, req);
- pt->pscsi_req = NULL;
}
static struct se_subsystem_api pscsi_template = {
.name = "pscsi",
.owner = THIS_MODULE,
.transport_type = TRANSPORT_PLUGIN_PHBA_PDEV,
- .cdb_none = pscsi_CDB_none,
- .map_control_SG = pscsi_map_SG,
- .map_data_SG = pscsi_map_SG,
.attach_hba = pscsi_attach_hba,
.detach_hba = pscsi_detach_hba,
.pmode_enable_hba = pscsi_pmode_enable_hba,
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff