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aic94xx_task.c
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1 /*
2  * Aic94xx SAS/SATA Tasks
3  *
4  * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
5  * Copyright (C) 2005 Luben Tuikov <[email protected]>
6  *
7  * This file is licensed under GPLv2.
8  *
9  * This file is part of the aic94xx driver.
10  *
11  * The aic94xx driver is free software; you can redistribute it and/or
12  * modify it under the terms of the GNU General Public License as
13  * published by the Free Software Foundation; version 2 of the
14  * License.
15  *
16  * The aic94xx driver is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19  * General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with the aic94xx driver; if not, write to the Free Software
23  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24  *
25  */
26 
27 #include <linux/spinlock.h>
28 #include "aic94xx.h"
29 #include "aic94xx_sas.h"
30 #include "aic94xx_hwi.h"
31 
32 static void asd_unbuild_ata_ascb(struct asd_ascb *a);
33 static void asd_unbuild_smp_ascb(struct asd_ascb *a);
34 static void asd_unbuild_ssp_ascb(struct asd_ascb *a);
35 
36 static void asd_can_dequeue(struct asd_ha_struct *asd_ha, int num)
37 {
38  unsigned long flags;
39 
40  spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
41  asd_ha->seq.can_queue += num;
42  spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);
43 }
44 
45 /* PCI_DMA_... to our direction translation.
46  */
47 static const u8 data_dir_flags[] = {
48  [PCI_DMA_BIDIRECTIONAL] = DATA_DIR_BYRECIPIENT, /* UNSPECIFIED */
49  [PCI_DMA_TODEVICE] = DATA_DIR_OUT, /* OUTBOUND */
50  [PCI_DMA_FROMDEVICE] = DATA_DIR_IN, /* INBOUND */
51  [PCI_DMA_NONE] = DATA_DIR_NONE, /* NO TRANSFER */
52 };
53 
54 static int asd_map_scatterlist(struct sas_task *task,
55  struct sg_el *sg_arr,
56  gfp_t gfp_flags)
57 {
58  struct asd_ascb *ascb = task->lldd_task;
59  struct asd_ha_struct *asd_ha = ascb->ha;
60  struct scatterlist *sc;
61  int num_sg, res;
62 
63  if (task->data_dir == PCI_DMA_NONE)
64  return 0;
65 
66  if (task->num_scatter == 0) {
67  void *p = task->scatter;
68  dma_addr_t dma = pci_map_single(asd_ha->pcidev, p,
69  task->total_xfer_len,
70  task->data_dir);
71  sg_arr[0].bus_addr = cpu_to_le64((u64)dma);
72  sg_arr[0].size = cpu_to_le32(task->total_xfer_len);
73  sg_arr[0].flags |= ASD_SG_EL_LIST_EOL;
74  return 0;
75  }
76 
77  /* STP tasks come from libata which has already mapped
78  * the SG list */
79  if (sas_protocol_ata(task->task_proto))
80  num_sg = task->num_scatter;
81  else
82  num_sg = pci_map_sg(asd_ha->pcidev, task->scatter,
83  task->num_scatter, task->data_dir);
84  if (num_sg == 0)
85  return -ENOMEM;
86 
87  if (num_sg > 3) {
88  int i;
89 
90  ascb->sg_arr = asd_alloc_coherent(asd_ha,
91  num_sg*sizeof(struct sg_el),
92  gfp_flags);
93  if (!ascb->sg_arr) {
94  res = -ENOMEM;
95  goto err_unmap;
96  }
97  for_each_sg(task->scatter, sc, num_sg, i) {
98  struct sg_el *sg =
99  &((struct sg_el *)ascb->sg_arr->vaddr)[i];
100  sg->bus_addr = cpu_to_le64((u64)sg_dma_address(sc));
101  sg->size = cpu_to_le32((u32)sg_dma_len(sc));
102  if (i == num_sg-1)
103  sg->flags |= ASD_SG_EL_LIST_EOL;
104  }
105 
106  for_each_sg(task->scatter, sc, 2, i) {
107  sg_arr[i].bus_addr =
108  cpu_to_le64((u64)sg_dma_address(sc));
109  sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
110  }
111  sg_arr[1].next_sg_offs = 2 * sizeof(*sg_arr);
112  sg_arr[1].flags |= ASD_SG_EL_LIST_EOS;
113 
114  memset(&sg_arr[2], 0, sizeof(*sg_arr));
115  sg_arr[2].bus_addr=cpu_to_le64((u64)ascb->sg_arr->dma_handle);
116  } else {
117  int i;
118  for_each_sg(task->scatter, sc, num_sg, i) {
119  sg_arr[i].bus_addr =
120  cpu_to_le64((u64)sg_dma_address(sc));
121  sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
122  }
123  sg_arr[i-1].flags |= ASD_SG_EL_LIST_EOL;
124  }
125 
126  return 0;
127 err_unmap:
128  if (sas_protocol_ata(task->task_proto))
129  pci_unmap_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
130  task->data_dir);
131  return res;
132 }
133 
134 static void asd_unmap_scatterlist(struct asd_ascb *ascb)
135 {
136  struct asd_ha_struct *asd_ha = ascb->ha;
137  struct sas_task *task = ascb->uldd_task;
138 
139  if (task->data_dir == PCI_DMA_NONE)
140  return;
141 
142  if (task->num_scatter == 0) {
143  dma_addr_t dma = (dma_addr_t)
144  le64_to_cpu(ascb->scb->ssp_task.sg_element[0].bus_addr);
145  pci_unmap_single(ascb->ha->pcidev, dma, task->total_xfer_len,
146  task->data_dir);
147  return;
148  }
149 
150  asd_free_coherent(asd_ha, ascb->sg_arr);
151  if (task->task_proto != SAS_PROTOCOL_STP)
152  pci_unmap_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
153  task->data_dir);
154 }
155 
156 /* ---------- Task complete tasklet ---------- */
157 
158 static void asd_get_response_tasklet(struct asd_ascb *ascb,
159  struct done_list_struct *dl)
160 {
161  struct asd_ha_struct *asd_ha = ascb->ha;
162  struct sas_task *task = ascb->uldd_task;
163  struct task_status_struct *ts = &task->task_status;
164  unsigned long flags;
165  struct tc_resp_sb_struct {
166  __le16 index_escb;
167  u8 len_lsb;
168  u8 flags;
169  } __attribute__ ((packed)) *resp_sb = (void *) dl->status_block;
170 
171 /* int size = ((resp_sb->flags & 7) << 8) | resp_sb->len_lsb; */
172  int edb_id = ((resp_sb->flags & 0x70) >> 4)-1;
173  struct asd_ascb *escb;
174  struct asd_dma_tok *edb;
175  void *r;
176 
177  spin_lock_irqsave(&asd_ha->seq.tc_index_lock, flags);
178  escb = asd_tc_index_find(&asd_ha->seq,
179  (int)le16_to_cpu(resp_sb->index_escb));
180  spin_unlock_irqrestore(&asd_ha->seq.tc_index_lock, flags);
181 
182  if (!escb) {
183  ASD_DPRINTK("Uh-oh! No escb for this dl?!\n");
184  return;
185  }
186 
187  ts->buf_valid_size = 0;
188  edb = asd_ha->seq.edb_arr[edb_id + escb->edb_index];
189  r = edb->vaddr;
190  if (task->task_proto == SAS_PROTOCOL_SSP) {
191  struct ssp_response_iu *iu =
192  r + 16 + sizeof(struct ssp_frame_hdr);
193 
194  ts->residual = le32_to_cpu(*(__le32 *)r);
195 
196  sas_ssp_task_response(&asd_ha->pcidev->dev, task, iu);
197  } else {
198  struct ata_task_resp *resp = (void *) &ts->buf[0];
199 
200  ts->residual = le32_to_cpu(*(__le32 *)r);
201 
202  if (SAS_STATUS_BUF_SIZE >= sizeof(*resp)) {
203  resp->frame_len = le16_to_cpu(*(__le16 *)(r+6));
204  memcpy(&resp->ending_fis[0], r+16, ATA_RESP_FIS_SIZE);
205  ts->buf_valid_size = sizeof(*resp);
206  }
207  }
208 
209  asd_invalidate_edb(escb, edb_id);
210 }
211 
212 static void asd_task_tasklet_complete(struct asd_ascb *ascb,
213  struct done_list_struct *dl)
214 {
215  struct sas_task *task = ascb->uldd_task;
216  struct task_status_struct *ts = &task->task_status;
217  unsigned long flags;
218  u8 opcode = dl->opcode;
219 
220  asd_can_dequeue(ascb->ha, 1);
221 
222 Again:
223  switch (opcode) {
224  case TC_NO_ERROR:
225  ts->resp = SAS_TASK_COMPLETE;
226  ts->stat = SAM_STAT_GOOD;
227  break;
228  case TC_UNDERRUN:
229  ts->resp = SAS_TASK_COMPLETE;
230  ts->stat = SAS_DATA_UNDERRUN;
231  ts->residual = le32_to_cpu(*(__le32 *)dl->status_block);
232  break;
233  case TC_OVERRUN:
234  ts->resp = SAS_TASK_COMPLETE;
235  ts->stat = SAS_DATA_OVERRUN;
236  ts->residual = 0;
237  break;
238  case TC_SSP_RESP:
239  case TC_ATA_RESP:
240  ts->resp = SAS_TASK_COMPLETE;
241  ts->stat = SAS_PROTO_RESPONSE;
242  asd_get_response_tasklet(ascb, dl);
243  break;
244  case TF_OPEN_REJECT:
245  ts->resp = SAS_TASK_UNDELIVERED;
246  ts->stat = SAS_OPEN_REJECT;
247  if (dl->status_block[1] & 2)
248  ts->open_rej_reason = 1 + dl->status_block[2];
249  else if (dl->status_block[1] & 1)
250  ts->open_rej_reason = (dl->status_block[2] >> 4)+10;
251  else
252  ts->open_rej_reason = SAS_OREJ_UNKNOWN;
253  break;
254  case TF_OPEN_TO:
255  ts->resp = SAS_TASK_UNDELIVERED;
256  ts->stat = SAS_OPEN_TO;
257  break;
258  case TF_PHY_DOWN:
259  case TU_PHY_DOWN:
260  ts->resp = SAS_TASK_UNDELIVERED;
261  ts->stat = SAS_PHY_DOWN;
262  break;
263  case TI_PHY_DOWN:
264  ts->resp = SAS_TASK_COMPLETE;
265  ts->stat = SAS_PHY_DOWN;
266  break;
267  case TI_BREAK:
268  case TI_PROTO_ERR:
269  case TI_NAK:
270  case TI_ACK_NAK_TO:
271  case TF_SMP_XMIT_RCV_ERR:
272  case TC_ATA_R_ERR_RECV:
273  ts->resp = SAS_TASK_COMPLETE;
274  ts->stat = SAS_INTERRUPTED;
275  break;
276  case TF_BREAK:
277  case TU_BREAK:
278  case TU_ACK_NAK_TO:
279  case TF_SMPRSP_TO:
280  ts->resp = SAS_TASK_UNDELIVERED;
281  ts->stat = SAS_DEV_NO_RESPONSE;
282  break;
283  case TF_NAK_RECV:
284  ts->resp = SAS_TASK_COMPLETE;
285  ts->stat = SAS_NAK_R_ERR;
286  break;
287  case TA_I_T_NEXUS_LOSS:
288  opcode = dl->status_block[0];
289  goto Again;
290  break;
291  case TF_INV_CONN_HANDLE:
292  ts->resp = SAS_TASK_UNDELIVERED;
293  ts->stat = SAS_DEVICE_UNKNOWN;
294  break;
295  case TF_REQUESTED_N_PENDING:
296  ts->resp = SAS_TASK_UNDELIVERED;
297  ts->stat = SAS_PENDING;
298  break;
299  case TC_TASK_CLEARED:
300  case TA_ON_REQ:
301  ts->resp = SAS_TASK_COMPLETE;
302  ts->stat = SAS_ABORTED_TASK;
303  break;
304 
305  case TF_NO_SMP_CONN:
306  case TF_TMF_NO_CTX:
307  case TF_TMF_NO_TAG:
308  case TF_TMF_TAG_FREE:
309  case TF_TMF_TASK_DONE:
310  case TF_TMF_NO_CONN_HANDLE:
311  case TF_IRTT_TO:
312  case TF_IU_SHORT:
313  case TF_DATA_OFFS_ERR:
314  ts->resp = SAS_TASK_UNDELIVERED;
315  ts->stat = SAS_DEV_NO_RESPONSE;
316  break;
317 
318  case TC_LINK_ADM_RESP:
319  case TC_CONTROL_PHY:
320  case TC_RESUME:
321  case TC_PARTIAL_SG_LIST:
322  default:
323  ASD_DPRINTK("%s: dl opcode: 0x%x?\n", __func__, opcode);
324  break;
325  }
326 
327  switch (task->task_proto) {
328  case SAS_PROTOCOL_SATA:
329  case SAS_PROTOCOL_STP:
330  asd_unbuild_ata_ascb(ascb);
331  break;
332  case SAS_PROTOCOL_SMP:
333  asd_unbuild_smp_ascb(ascb);
334  break;
335  case SAS_PROTOCOL_SSP:
336  asd_unbuild_ssp_ascb(ascb);
337  default:
338  break;
339  }
340 
341  spin_lock_irqsave(&task->task_state_lock, flags);
342  task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
343  task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
344  task->task_state_flags |= SAS_TASK_STATE_DONE;
345  if (unlikely((task->task_state_flags & SAS_TASK_STATE_ABORTED))) {
346  struct completion *completion = ascb->completion;
347  spin_unlock_irqrestore(&task->task_state_lock, flags);
348  ASD_DPRINTK("task 0x%p done with opcode 0x%x resp 0x%x "
349  "stat 0x%x but aborted by upper layer!\n",
350  task, opcode, ts->resp, ts->stat);
351  if (completion)
352  complete(completion);
353  } else {
354  spin_unlock_irqrestore(&task->task_state_lock, flags);
355  task->lldd_task = NULL;
356  asd_ascb_free(ascb);
357  mb();
358  task->task_done(task);
359  }
360 }
361 
362 /* ---------- ATA ---------- */
363 
364 static int asd_build_ata_ascb(struct asd_ascb *ascb, struct sas_task *task,
365  gfp_t gfp_flags)
366 {
367  struct domain_device *dev = task->dev;
368  struct scb *scb;
369  u8 flags;
370  int res = 0;
371 
372  scb = ascb->scb;
373 
374  if (unlikely(task->ata_task.device_control_reg_update))
375  scb->header.opcode = CONTROL_ATA_DEV;
376  else if (dev->sata_dev.command_set == ATA_COMMAND_SET)
377  scb->header.opcode = INITIATE_ATA_TASK;
378  else
379  scb->header.opcode = INITIATE_ATAPI_TASK;
380 
381  scb->ata_task.proto_conn_rate = (1 << 5); /* STP */
382  if (dev->port->oob_mode == SAS_OOB_MODE)
383  scb->ata_task.proto_conn_rate |= dev->linkrate;
384 
385  scb->ata_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
386  scb->ata_task.fis = task->ata_task.fis;
387  if (likely(!task->ata_task.device_control_reg_update))
388  scb->ata_task.fis.flags |= 0x80; /* C=1: update ATA cmd reg */
389  scb->ata_task.fis.flags &= 0xF0; /* PM_PORT field shall be 0 */
390  if (dev->sata_dev.command_set == ATAPI_COMMAND_SET)
391  memcpy(scb->ata_task.atapi_packet, task->ata_task.atapi_packet,
392  16);
393  scb->ata_task.sister_scb = cpu_to_le16(0xFFFF);
394  scb->ata_task.conn_handle = cpu_to_le16(
395  (u16)(unsigned long)dev->lldd_dev);
396 
397  if (likely(!task->ata_task.device_control_reg_update)) {
398  flags = 0;
399  if (task->ata_task.dma_xfer)
400  flags |= DATA_XFER_MODE_DMA;
401  if (task->ata_task.use_ncq &&
402  dev->sata_dev.command_set != ATAPI_COMMAND_SET)
403  flags |= ATA_Q_TYPE_NCQ;
404  flags |= data_dir_flags[task->data_dir];
405  scb->ata_task.ata_flags = flags;
406 
407  scb->ata_task.retry_count = task->ata_task.retry_count;
408 
409  flags = 0;
410  if (task->ata_task.set_affil_pol)
411  flags |= SET_AFFIL_POLICY;
412  if (task->ata_task.stp_affil_pol)
413  flags |= STP_AFFIL_POLICY;
414  scb->ata_task.flags = flags;
415  }
416  ascb->tasklet_complete = asd_task_tasklet_complete;
417 
418  if (likely(!task->ata_task.device_control_reg_update))
419  res = asd_map_scatterlist(task, scb->ata_task.sg_element,
420  gfp_flags);
421 
422  return res;
423 }
424 
425 static void asd_unbuild_ata_ascb(struct asd_ascb *a)
426 {
427  asd_unmap_scatterlist(a);
428 }
429 
430 /* ---------- SMP ---------- */
431 
432 static int asd_build_smp_ascb(struct asd_ascb *ascb, struct sas_task *task,
433  gfp_t gfp_flags)
434 {
435  struct asd_ha_struct *asd_ha = ascb->ha;
436  struct domain_device *dev = task->dev;
437  struct scb *scb;
438 
439  pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_req, 1,
440  PCI_DMA_TODEVICE);
441  pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_resp, 1,
442  PCI_DMA_FROMDEVICE);
443 
444  scb = ascb->scb;
445 
446  scb->header.opcode = INITIATE_SMP_TASK;
447 
448  scb->smp_task.proto_conn_rate = dev->linkrate;
449 
450  scb->smp_task.smp_req.bus_addr =
451  cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_req));
452  scb->smp_task.smp_req.size =
453  cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_req)-4);
454 
455  scb->smp_task.smp_resp.bus_addr =
456  cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_resp));
457  scb->smp_task.smp_resp.size =
458  cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_resp)-4);
459 
460  scb->smp_task.sister_scb = cpu_to_le16(0xFFFF);
461  scb->smp_task.conn_handle = cpu_to_le16((u16)
462  (unsigned long)dev->lldd_dev);
463 
464  ascb->tasklet_complete = asd_task_tasklet_complete;
465 
466  return 0;
467 }
468 
469 static void asd_unbuild_smp_ascb(struct asd_ascb *a)
470 {
471  struct sas_task *task = a->uldd_task;
472 
473  BUG_ON(!task);
474  pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_req, 1,
475  PCI_DMA_TODEVICE);
476  pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_resp, 1,
477  PCI_DMA_FROMDEVICE);
478 }
479 
480 /* ---------- SSP ---------- */
481 
482 static int asd_build_ssp_ascb(struct asd_ascb *ascb, struct sas_task *task,
483  gfp_t gfp_flags)
484 {
485  struct domain_device *dev = task->dev;
486  struct scb *scb;
487  int res = 0;
488 
489  scb = ascb->scb;
490 
491  scb->header.opcode = INITIATE_SSP_TASK;
492 
493  scb->ssp_task.proto_conn_rate = (1 << 4); /* SSP */
494  scb->ssp_task.proto_conn_rate |= dev->linkrate;
495  scb->ssp_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
496  scb->ssp_task.ssp_frame.frame_type = SSP_DATA;
497  memcpy(scb->ssp_task.ssp_frame.hashed_dest_addr, dev->hashed_sas_addr,
498  HASHED_SAS_ADDR_SIZE);
499  memcpy(scb->ssp_task.ssp_frame.hashed_src_addr,
500  dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
501  scb->ssp_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);
502 
503  memcpy(scb->ssp_task.ssp_cmd.lun, task->ssp_task.LUN, 8);
504  if (task->ssp_task.enable_first_burst)
505  scb->ssp_task.ssp_cmd.efb_prio_attr |= EFB_MASK;
506  scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_prio << 3);
507  scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_attr & 7);
508  memcpy(scb->ssp_task.ssp_cmd.cdb, task->ssp_task.cdb, 16);
509 
510  scb->ssp_task.sister_scb = cpu_to_le16(0xFFFF);
511  scb->ssp_task.conn_handle = cpu_to_le16(
512  (u16)(unsigned long)dev->lldd_dev);
513  scb->ssp_task.data_dir = data_dir_flags[task->data_dir];
514  scb->ssp_task.retry_count = scb->ssp_task.retry_count;
515 
516  ascb->tasklet_complete = asd_task_tasklet_complete;
517 
518  res = asd_map_scatterlist(task, scb->ssp_task.sg_element, gfp_flags);
519 
520  return res;
521 }
522 
523 static void asd_unbuild_ssp_ascb(struct asd_ascb *a)
524 {
525  asd_unmap_scatterlist(a);
526 }
527 
528 /* ---------- Execute Task ---------- */
529 
530 static int asd_can_queue(struct asd_ha_struct *asd_ha, int num)
531 {
532  int res = 0;
533  unsigned long flags;
534 
535  spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
536  if ((asd_ha->seq.can_queue - num) < 0)
537  res = -SAS_QUEUE_FULL;
538  else
539  asd_ha->seq.can_queue -= num;
540  spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);
541 
542  return res;
543 }
544 
545 int asd_execute_task(struct sas_task *task, const int num,
546  gfp_t gfp_flags)
547 {
548  int res = 0;
549  LIST_HEAD(alist);
550  struct sas_task *t = task;
551  struct asd_ascb *ascb = NULL, *a;
552  struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
553  unsigned long flags;
554 
555  res = asd_can_queue(asd_ha, num);
556  if (res)
557  return res;
558 
559  res = num;
560  ascb = asd_ascb_alloc_list(asd_ha, &res, gfp_flags);
561  if (res) {
562  res = -ENOMEM;
563  goto out_err;
564  }
565 
566  __list_add(&alist, ascb->list.prev, &ascb->list);
567  list_for_each_entry(a, &alist, list) {
568  a->uldd_task = t;
569  t->lldd_task = a;
570  t = list_entry(t->list.next, struct sas_task, list);
571  }
572  list_for_each_entry(a, &alist, list) {
573  t = a->uldd_task;
574  a->uldd_timer = 1;
575  if (t->task_proto & SAS_PROTOCOL_STP)
576  t->task_proto = SAS_PROTOCOL_STP;
577  switch (t->task_proto) {
578  case SAS_PROTOCOL_SATA:
579  case SAS_PROTOCOL_STP:
580  res = asd_build_ata_ascb(a, t, gfp_flags);
581  break;
582  case SAS_PROTOCOL_SMP:
583  res = asd_build_smp_ascb(a, t, gfp_flags);
584  break;
585  case SAS_PROTOCOL_SSP:
586  res = asd_build_ssp_ascb(a, t, gfp_flags);
587  break;
588  default:
589  asd_printk("unknown sas_task proto: 0x%x\n",
590  t->task_proto);
591  res = -ENOMEM;
592  break;
593  }
594  if (res)
595  goto out_err_unmap;
596 
597  spin_lock_irqsave(&t->task_state_lock, flags);
598  t->task_state_flags |= SAS_TASK_AT_INITIATOR;
599  spin_unlock_irqrestore(&t->task_state_lock, flags);
600  }
601  list_del_init(&alist);
602 
603  res = asd_post_ascb_list(asd_ha, ascb, num);
604  if (unlikely(res)) {
605  a = NULL;
606  __list_add(&alist, ascb->list.prev, &ascb->list);
607  goto out_err_unmap;
608  }
609 
610  return 0;
611 out_err_unmap:
612  {
613  struct asd_ascb *b = a;
614  list_for_each_entry(a, &alist, list) {
615  if (a == b)
616  break;
617  t = a->uldd_task;
618  spin_lock_irqsave(&t->task_state_lock, flags);
619  t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
620  spin_unlock_irqrestore(&t->task_state_lock, flags);
621  switch (t->task_proto) {
622  case SAS_PROTOCOL_SATA:
623  case SAS_PROTOCOL_STP:
624  asd_unbuild_ata_ascb(a);
625  break;
626  case SAS_PROTOCOL_SMP:
627  asd_unbuild_smp_ascb(a);
628  break;
629  case SAS_PROTOCOL_SSP:
630  asd_unbuild_ssp_ascb(a);
631  default:
632  break;
633  }
634  t->lldd_task = NULL;
635  }
636  }
637  list_del_init(&alist);
638 out_err:
639  if (ascb)
640  asd_ascb_free_list(ascb);
641  asd_can_dequeue(asd_ha, num);
642  return res;
643 }
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