2 * Copyright 2014 Cisco Systems, Inc. All rights reserved.
4 * This program is free software; you may redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
18 #include <linux/errno.h>
19 #include <linux/mempool.h>
21 #include <scsi/scsi_tcq.h>
23 #include "snic_disc.h"
28 /* snic target types */
29 static const char * const snic_tgt_type_str[] = {
30 [SNIC_TGT_DAS] = "DAS",
31 [SNIC_TGT_SAN] = "SAN",
34 static inline const char *
35 snic_tgt_type_to_str(int typ)
37 return ((typ > SNIC_TGT_NONE && typ <= SNIC_TGT_SAN) ?
38 snic_tgt_type_str[typ] : "Unknown");
41 static const char * const snic_tgt_state_str[] = {
42 [SNIC_TGT_STAT_INIT] = "INIT",
43 [SNIC_TGT_STAT_ONLINE] = "ONLINE",
44 [SNIC_TGT_STAT_OFFLINE] = "OFFLINE",
45 [SNIC_TGT_STAT_DEL] = "DELETION IN PROGRESS",
49 snic_tgt_state_to_str(int state)
51 return ((state >= SNIC_TGT_STAT_INIT && state <= SNIC_TGT_STAT_DEL) ?
52 snic_tgt_state_str[state] : "UNKNOWN");
56 * Initiate report_tgt req desc
59 snic_report_tgt_init(struct snic_host_req *req, u32 hid, u8 *buf, u32 len,
60 dma_addr_t rsp_buf_pa, ulong ctx)
62 struct snic_sg_desc *sgd = NULL;
65 snic_io_hdr_enc(&req->hdr, SNIC_REQ_REPORT_TGTS, 0, SCSI_NO_TAG, hid,
68 req->u.rpt_tgts.sg_cnt = cpu_to_le16(1);
69 sgd = req_to_sgl(req);
70 sgd[0].addr = cpu_to_le64(rsp_buf_pa);
71 sgd[0].len = cpu_to_le32(len);
73 req->u.rpt_tgts.sg_addr = cpu_to_le64((ulong)sgd);
77 * snic_queue_report_tgt_req: Queues report target request.
80 snic_queue_report_tgt_req(struct snic *snic)
82 struct snic_req_info *rqi = NULL;
83 u32 ntgts, buf_len = 0;
88 rqi = snic_req_init(snic, 1);
94 if (snic->fwinfo.max_tgts)
95 ntgts = min_t(u32, snic->fwinfo.max_tgts, snic->shost->max_id);
97 ntgts = snic->shost->max_id;
99 /* Allocate Response Buffer */
100 SNIC_BUG_ON(ntgts == 0);
101 buf_len = ntgts * sizeof(struct snic_tgt_id) + SNIC_SG_DESC_ALIGN;
103 buf = kzalloc(buf_len, GFP_KERNEL|GFP_DMA);
105 snic_req_free(snic, rqi);
106 SNIC_HOST_ERR(snic->shost, "Resp Buf Alloc Failed.\n");
112 SNIC_BUG_ON((((unsigned long)buf) % SNIC_SG_DESC_ALIGN) != 0);
114 pa = pci_map_single(snic->pdev, buf, buf_len, PCI_DMA_FROMDEVICE);
115 if (pci_dma_mapping_error(snic->pdev, pa)) {
116 SNIC_HOST_ERR(snic->shost,
117 "Rpt-tgt rspbuf %p: PCI DMA Mapping Failed\n",
120 snic_req_free(snic, rqi);
127 SNIC_BUG_ON(pa == 0);
128 rqi->sge_va = (ulong) buf;
130 snic_report_tgt_init(rqi->req,
137 snic_handle_untagged_req(snic, rqi);
139 ret = snic_queue_wq_desc(snic, rqi->req, rqi->req_len);
141 pci_unmap_single(snic->pdev, pa, buf_len, PCI_DMA_FROMDEVICE);
144 snic_release_untagged_req(snic, rqi);
145 SNIC_HOST_ERR(snic->shost, "Queuing Report Tgts Failed.\n");
150 SNIC_DISC_DBG(snic->shost, "Report Targets Issued.\n");
155 SNIC_HOST_ERR(snic->shost,
156 "Queuing Report Targets Failed, err = %d\n",
159 } /* end of snic_queue_report_tgt_req */
163 snic_scsi_scan_tgt(struct work_struct *work)
165 struct snic_tgt *tgt = container_of(work, struct snic_tgt, scan_work);
166 struct Scsi_Host *shost = dev_to_shost(&tgt->dev);
169 SNIC_HOST_INFO(shost, "Scanning Target id 0x%x\n", tgt->id);
170 scsi_scan_target(&tgt->dev,
176 spin_lock_irqsave(shost->host_lock, flags);
177 tgt->flags &= ~SNIC_TGT_SCAN_PENDING;
178 spin_unlock_irqrestore(shost->host_lock, flags);
179 } /* end of snic_scsi_scan_tgt */
184 static struct snic_tgt *
185 snic_tgt_lookup(struct snic *snic, struct snic_tgt_id *tgtid)
187 struct list_head *cur, *nxt;
188 struct snic_tgt *tgt = NULL;
190 list_for_each_safe(cur, nxt, &snic->disc.tgt_list) {
191 tgt = list_entry(cur, struct snic_tgt, list);
192 if (tgt->id == le32_to_cpu(tgtid->tgt_id))
198 } /* end of snic_tgt_lookup */
201 * snic_tgt_dev_release : Called on dropping last ref for snic_tgt object
204 snic_tgt_dev_release(struct device *dev)
206 struct snic_tgt *tgt = dev_to_tgt(dev);
208 SNIC_HOST_INFO(snic_tgt_to_shost(tgt),
209 "Target Device ID %d (%s) Permanently Deleted.\n",
213 SNIC_BUG_ON(!list_empty(&tgt->list));
218 * snic_tgt_del : work function to delete snic_tgt
221 snic_tgt_del(struct work_struct *work)
223 struct snic_tgt *tgt = container_of(work, struct snic_tgt, del_work);
224 struct Scsi_Host *shost = snic_tgt_to_shost(tgt);
226 if (tgt->flags & SNIC_TGT_SCAN_PENDING)
227 scsi_flush_work(shost);
229 /* Block IOs on child devices, stops new IOs */
230 scsi_target_block(&tgt->dev);
233 snic_tgt_scsi_abort_io(tgt);
235 /* Unblock IOs now, to flush if there are any. */
236 scsi_target_unblock(&tgt->dev, SDEV_TRANSPORT_OFFLINE);
238 /* Delete SCSI Target and sdevs */
239 scsi_remove_target(&tgt->dev); /* ?? */
240 device_del(&tgt->dev);
241 put_device(&tgt->dev);
242 } /* end of snic_tgt_del */
244 /* snic_tgt_create: checks for existence of snic_tgt, if it doesn't
247 static struct snic_tgt *
248 snic_tgt_create(struct snic *snic, struct snic_tgt_id *tgtid)
250 struct snic_tgt *tgt = NULL;
254 tgt = snic_tgt_lookup(snic, tgtid);
256 /* update the information if required */
260 tgt = kzalloc(sizeof(*tgt), GFP_KERNEL);
262 SNIC_HOST_ERR(snic->shost, "Failure to allocate snic_tgt.\n");
268 INIT_LIST_HEAD(&tgt->list);
269 tgt->id = le32_to_cpu(tgtid->tgt_id);
272 SNIC_BUG_ON(le16_to_cpu(tgtid->tgt_type) > SNIC_TGT_SAN);
273 tgt->tdata.typ = le16_to_cpu(tgtid->tgt_type);
276 * Plugging into SML Device Tree
278 tgt->tdata.disc_id = 0;
279 tgt->state = SNIC_TGT_STAT_INIT;
280 device_initialize(&tgt->dev);
281 tgt->dev.parent = get_device(&snic->shost->shost_gendev);
282 tgt->dev.release = snic_tgt_dev_release;
283 INIT_WORK(&tgt->scan_work, snic_scsi_scan_tgt);
284 INIT_WORK(&tgt->del_work, snic_tgt_del);
285 switch (tgt->tdata.typ) {
287 dev_set_name(&tgt->dev, "snic_das_tgt:%d:%d-%d",
288 snic->shost->host_no, tgt->channel, tgt->id);
292 dev_set_name(&tgt->dev, "snic_san_tgt:%d:%d-%d",
293 snic->shost->host_no, tgt->channel, tgt->id);
297 SNIC_HOST_INFO(snic->shost, "Target type Unknown Detected.\n");
298 dev_set_name(&tgt->dev, "snic_das_tgt:%d:%d-%d",
299 snic->shost->host_no, tgt->channel, tgt->id);
303 spin_lock_irqsave(snic->shost->host_lock, flags);
304 list_add_tail(&tgt->list, &snic->disc.tgt_list);
305 tgt->scsi_tgt_id = snic->disc.nxt_tgt_id++;
306 tgt->state = SNIC_TGT_STAT_ONLINE;
307 spin_unlock_irqrestore(snic->shost->host_lock, flags);
309 SNIC_HOST_INFO(snic->shost,
310 "Tgt %d, type = %s detected. Adding..\n",
311 tgt->id, snic_tgt_type_to_str(tgt->tdata.typ));
313 ret = device_add(&tgt->dev);
315 SNIC_HOST_ERR(snic->shost,
316 "Snic Tgt: device_add, with err = %d\n",
319 put_device(&snic->shost->shost_gendev);
326 SNIC_HOST_INFO(snic->shost, "Scanning %s.\n", dev_name(&tgt->dev));
328 scsi_queue_work(snic->shost, &tgt->scan_work);
331 } /* end of snic_tgt_create */
333 /* Handler for discovery */
335 snic_handle_tgt_disc(struct work_struct *work)
337 struct snic *snic = container_of(work, struct snic, tgt_work);
338 struct snic_tgt_id *tgtid = NULL;
339 struct snic_tgt *tgt = NULL;
343 spin_lock_irqsave(&snic->snic_lock, flags);
344 if (snic->in_remove) {
345 spin_unlock_irqrestore(&snic->snic_lock, flags);
346 kfree(snic->disc.rtgt_info);
350 spin_unlock_irqrestore(&snic->snic_lock, flags);
352 mutex_lock(&snic->disc.mutex);
353 /* Discover triggered during disc in progress */
354 if (snic->disc.req_cnt) {
355 snic->disc.state = SNIC_DISC_DONE;
356 snic->disc.req_cnt = 0;
357 mutex_unlock(&snic->disc.mutex);
358 kfree(snic->disc.rtgt_info);
359 snic->disc.rtgt_info = NULL;
361 SNIC_HOST_INFO(snic->shost, "tgt_disc: Discovery restart.\n");
362 /* Start Discovery Again */
363 snic_disc_start(snic);
368 tgtid = (struct snic_tgt_id *)snic->disc.rtgt_info;
370 SNIC_BUG_ON(snic->disc.rtgt_cnt == 0 || tgtid == NULL);
372 for (i = 0; i < snic->disc.rtgt_cnt; i++) {
373 tgt = snic_tgt_create(snic, &tgtid[i]);
375 int buf_sz = snic->disc.rtgt_cnt * sizeof(*tgtid);
377 SNIC_HOST_ERR(snic->shost, "Failed to create tgt.\n");
378 snic_hex_dump("rpt_tgt_rsp", (char *)tgtid, buf_sz);
383 snic->disc.rtgt_info = NULL;
384 snic->disc.state = SNIC_DISC_DONE;
385 mutex_unlock(&snic->disc.mutex);
387 SNIC_HOST_INFO(snic->shost, "Discovery Completed.\n");
390 } /* end of snic_handle_tgt_disc */
394 snic_report_tgt_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
398 u32 cmnd_id, hid, tgt_cnt = 0;
400 struct snic_req_info *rqi = NULL;
401 struct snic_tgt_id *tgtid;
404 snic_io_hdr_dec(&fwreq->hdr, &typ, &cmpl_stat, &cmnd_id, &hid, &ctx);
405 rqi = (struct snic_req_info *) ctx;
406 tgtid = (struct snic_tgt_id *) rqi->sge_va;
408 tgt_cnt = le32_to_cpu(fwreq->u.rpt_tgts_cmpl.tgt_cnt);
410 SNIC_HOST_ERR(snic->shost, "No Targets Found on this host.\n");
416 /* printing list of targets here */
417 SNIC_HOST_INFO(snic->shost, "Target Count = %d\n", tgt_cnt);
419 SNIC_BUG_ON(tgt_cnt > snic->fwinfo.max_tgts);
421 for (i = 0; i < tgt_cnt; i++)
422 SNIC_HOST_INFO(snic->shost,
424 le32_to_cpu(tgtid[i].tgt_id));
427 * Queue work for further processing,
428 * Response Buffer Memory is freed after creating targets
430 snic->disc.rtgt_cnt = tgt_cnt;
431 snic->disc.rtgt_info = (u8 *) tgtid;
432 queue_work(snic_glob->event_q, &snic->tgt_work);
436 /* Unmap Response Buffer */
437 snic_pci_unmap_rsp_buf(snic, rqi);
442 snic_release_untagged_req(snic, rqi);
445 } /* end of snic_report_tgt_cmpl_handler */
447 /* Discovery init fn */
449 snic_disc_init(struct snic_disc *disc)
451 INIT_LIST_HEAD(&disc->tgt_list);
452 mutex_init(&disc->mutex);
454 disc->nxt_tgt_id = 0;
455 disc->state = SNIC_DISC_INIT;
458 disc->rtgt_info = NULL;
460 } /* end of snic_disc_init */
462 /* Discovery, uninit fn */
464 snic_disc_term(struct snic *snic)
466 struct snic_disc *disc = &snic->disc;
468 mutex_lock(&disc->mutex);
471 SNIC_SCSI_DBG(snic->shost, "Terminating Discovery.\n");
473 mutex_unlock(&disc->mutex);
477 * snic_disc_start: Discovery Start ...
480 snic_disc_start(struct snic *snic)
482 struct snic_disc *disc = &snic->disc;
486 SNIC_SCSI_DBG(snic->shost, "Discovery Start.\n");
488 spin_lock_irqsave(&snic->snic_lock, flags);
489 if (snic->in_remove) {
490 spin_unlock_irqrestore(&snic->snic_lock, flags);
491 SNIC_ERR("snic driver removal in progress ...\n");
496 spin_unlock_irqrestore(&snic->snic_lock, flags);
498 mutex_lock(&disc->mutex);
499 if (disc->state == SNIC_DISC_PENDING) {
501 mutex_unlock(&disc->mutex);
505 disc->state = SNIC_DISC_PENDING;
506 mutex_unlock(&disc->mutex);
508 ret = snic_queue_report_tgt_req(snic);
510 SNIC_HOST_INFO(snic->shost, "Discovery Failed, err=%d.\n", ret);
513 } /* end of snic_disc_start */
519 snic_handle_disc(struct work_struct *work)
521 struct snic *snic = container_of(work, struct snic, disc_work);
524 SNIC_HOST_INFO(snic->shost, "disc_work: Discovery\n");
526 ret = snic_disc_start(snic);
531 SNIC_HOST_ERR(snic->shost,
532 "disc_work: Discovery Failed w/ err = %d\n",
534 } /* end of snic_disc_work */
537 * snic_tgt_del_all : cleanup all snic targets
538 * Called on unbinding the interface
541 snic_tgt_del_all(struct snic *snic)
543 struct snic_tgt *tgt = NULL;
544 struct list_head *cur, *nxt;
547 scsi_flush_work(snic->shost);
549 mutex_lock(&snic->disc.mutex);
550 spin_lock_irqsave(snic->shost->host_lock, flags);
552 list_for_each_safe(cur, nxt, &snic->disc.tgt_list) {
553 tgt = list_entry(cur, struct snic_tgt, list);
554 tgt->state = SNIC_TGT_STAT_DEL;
555 list_del_init(&tgt->list);
556 SNIC_HOST_INFO(snic->shost, "Tgt %d q'ing for del\n", tgt->id);
557 queue_work(snic_glob->event_q, &tgt->del_work);
560 spin_unlock_irqrestore(snic->shost->host_lock, flags);
561 mutex_unlock(&snic->disc.mutex);
563 flush_workqueue(snic_glob->event_q);
564 } /* end of snic_tgt_del_all */