drivers/scsi/aic94xx/aic94xx_tmf.c

   1 /*
   2  * Aic94xx Task Management Functions
   3  *
   4  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   5  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   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 <linux/gfp.h>
  29 #include "aic94xx.h"
  30 #include "aic94xx_sas.h"
  31 #include "aic94xx_hwi.h"
  32
  33 /* ---------- Internal enqueue ---------- */
  34
  35 static int asd_enqueue_internal(struct asd_ascb *ascb,
  36                 void (*tasklet_complete)(struct asd_ascb *,
  37                                          struct done_list_struct *),
  38                                 void (*timed_out)(unsigned long))
  39 {
  40         int res;
  41
  42         ascb->tasklet_complete = tasklet_complete;
  43         ascb->uldd_timer = 1;
  44
  45         ascb->timer.data = (unsigned long) ascb;
  46         ascb->timer.function = timed_out;
  47         ascb->timer.expires = jiffies + AIC94XX_SCB_TIMEOUT;
  48
  49         add_timer(&ascb->timer);
  50
  51         res = asd_post_ascb_list(ascb->ha, ascb, 1);
  52         if (unlikely(res))
  53                 del_timer(&ascb->timer);
  54         return res;
  55 }
  56
  57 /* ---------- CLEAR NEXUS ---------- */
  58
  59 struct tasklet_completion_status {
  60         int     dl_opcode;
  61         int     tmf_state;
  62         u8      tag_valid:1;
  63         __be16  tag;
  64 };
  65
  66 #define DECLARE_TCS(tcs) \
  67         struct tasklet_completion_status tcs = { \
  68                 .dl_opcode = 0, \
  69                 .tmf_state = 0, \
  70                 .tag_valid = 0, \
  71                 .tag = 0, \
  72         }
  73
  74
  75 static void asd_clear_nexus_tasklet_complete(struct asd_ascb *ascb,
  76                                              struct done_list_struct *dl)
  77 {
  78         struct tasklet_completion_status *tcs = ascb->uldd_task;
  79         ASD_DPRINTK("%s: here\n", __func__);
  80         if (!del_timer(&ascb->timer)) {
  81                 ASD_DPRINTK("%s: couldn't delete timer\n", __func__);
  82                 return;
  83         }
  84         ASD_DPRINTK("%s: opcode: 0x%x\n", __func__, dl->opcode);
  85         tcs->dl_opcode = dl->opcode;
  86         complete(ascb->completion);
  87         asd_ascb_free(ascb);
  88 }
  89
  90 static void asd_clear_nexus_timedout(unsigned long data)
  91 {
  92         struct asd_ascb *ascb = (void *)data;
  93         struct tasklet_completion_status *tcs = ascb->uldd_task;
  94
  95         ASD_DPRINTK("%s: here\n", __func__);
  96         tcs->dl_opcode = TMF_RESP_FUNC_FAILED;
  97         complete(ascb->completion);
  98 }
  99
 100 #define CLEAR_NEXUS_PRE         \
 101         struct asd_ascb *ascb; \
 102         struct scb *scb; \
 103         int res; \
 104         DECLARE_COMPLETION_ONSTACK(completion); \
 105         DECLARE_TCS(tcs); \
 106                 \
 107         ASD_DPRINTK("%s: PRE\n", __func__); \
 108         res = 1;                \
 109         ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL); \
 110         if (!ascb)              \
 111                 return -ENOMEM; \
 112                                 \
 113         ascb->completion = &completion; \
 114         ascb->uldd_task = &tcs; \
 115         scb = ascb->scb;        \
 116         scb->header.opcode = CLEAR_NEXUS
 117
 118 #define CLEAR_NEXUS_POST        \
 119         ASD_DPRINTK("%s: POST\n", __func__); \
 120         res = asd_enqueue_internal(ascb, asd_clear_nexus_tasklet_complete, \
 121                                    asd_clear_nexus_timedout);              \
 122         if (res)                \
 123                 goto out_err;   \
 124         ASD_DPRINTK("%s: clear nexus posted, waiting...\n", __func__); \
 125         wait_for_completion(&completion); \
 126         res = tcs.dl_opcode; \
 127         if (res == TC_NO_ERROR) \
 128                 res = TMF_RESP_FUNC_COMPLETE;   \
 129         return res; \
 130 out_err:                        \
 131         asd_ascb_free(ascb);    \
 132         return res
 133
 134 int asd_clear_nexus_ha(struct sas_ha_struct *sas_ha)
 135 {
 136         struct asd_ha_struct *asd_ha = sas_ha->lldd_ha;
 137
 138         CLEAR_NEXUS_PRE;
 139         scb->clear_nexus.nexus = NEXUS_ADAPTER;
 140         CLEAR_NEXUS_POST;
 141 }
 142
 143 int asd_clear_nexus_port(struct asd_sas_port *port)
 144 {
 145         struct asd_ha_struct *asd_ha = port->ha->lldd_ha;
 146
 147         CLEAR_NEXUS_PRE;
 148         scb->clear_nexus.nexus = NEXUS_PORT;
 149         scb->clear_nexus.conn_mask = port->phy_mask;
 150         CLEAR_NEXUS_POST;
 151 }
 152
 153 enum clear_nexus_phase {
 154         NEXUS_PHASE_PRE,
 155         NEXUS_PHASE_POST,
 156         NEXUS_PHASE_RESUME,
 157 };
 158
 159 static int asd_clear_nexus_I_T(struct domain_device *dev,
 160                                enum clear_nexus_phase phase)
 161 {
 162         struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
 163
 164         CLEAR_NEXUS_PRE;
 165         scb->clear_nexus.nexus = NEXUS_I_T;
 166         switch (phase) {
 167         case NEXUS_PHASE_PRE:
 168                 scb->clear_nexus.flags = EXEC_Q | SUSPEND_TX;
 169                 break;
 170         case NEXUS_PHASE_POST:
 171                 scb->clear_nexus.flags = SEND_Q | NOTINQ;
 172                 break;
 173         case NEXUS_PHASE_RESUME:
 174                 scb->clear_nexus.flags = RESUME_TX;
 175         }
 176         scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
 177                                                    dev->lldd_dev);
 178         CLEAR_NEXUS_POST;
 179 }
 180
 181 int asd_I_T_nexus_reset(struct domain_device *dev)
 182 {
 183         int res, tmp_res, i;
 184         struct sas_phy *phy = sas_get_local_phy(dev);
 185         /* Standard mandates link reset for ATA  (type 0) and
 186          * hard reset for SSP (type 1) */
 187         int reset_type = (dev->dev_type == SAS_SATA_DEV ||
 188                           (dev->tproto & SAS_PROTOCOL_STP)) ? 0 : 1;
 189
 190         asd_clear_nexus_I_T(dev, NEXUS_PHASE_PRE);
 191         /* send a hard reset */
 192         ASD_DPRINTK("sending %s reset to %s\n",
 193                     reset_type ? "hard" : "soft", dev_name(&phy->dev));
 194         res = sas_phy_reset(phy, reset_type);
 195         if (res == TMF_RESP_FUNC_COMPLETE || res == -ENODEV) {
 196                 /* wait for the maximum settle time */
 197                 msleep(500);
 198                 /* clear all outstanding commands (keep nexus suspended) */
 199                 asd_clear_nexus_I_T(dev, NEXUS_PHASE_POST);
 200         }
 201         for (i = 0 ; i < 3; i++) {
 202                 tmp_res = asd_clear_nexus_I_T(dev, NEXUS_PHASE_RESUME);
 203                 if (tmp_res == TC_RESUME)
 204                         goto out;
 205                 msleep(500);
 206         }
 207
 208         /* This is a bit of a problem:  the sequencer is still suspended
 209          * and is refusing to resume.  Hope it will resume on a bigger hammer
 210          * or the disk is lost */
 211         dev_printk(KERN_ERR, &phy->dev,
 212                    "Failed to resume nexus after reset 0x%x\n", tmp_res);
 213
 214         res = TMF_RESP_FUNC_FAILED;
 215  out:
 216         sas_put_local_phy(phy);
 217         return res;
 218 }
 219
 220 static int asd_clear_nexus_I_T_L(struct domain_device *dev, u8 *lun)
 221 {
 222         struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
 223
 224         CLEAR_NEXUS_PRE;
 225         scb->clear_nexus.nexus = NEXUS_I_T_L;
 226         scb->clear_nexus.flags = SEND_Q | EXEC_Q | NOTINQ;
 227         memcpy(scb->clear_nexus.ssp_task.lun, lun, 8);
 228         scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
 229                                                    dev->lldd_dev);
 230         CLEAR_NEXUS_POST;
 231 }
 232
 233 static int asd_clear_nexus_tag(struct sas_task *task)
 234 {
 235         struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
 236         struct asd_ascb *tascb = task->lldd_task;
 237
 238         CLEAR_NEXUS_PRE;
 239         scb->clear_nexus.nexus = NEXUS_TAG;
 240         memcpy(scb->clear_nexus.ssp_task.lun, task->ssp_task.LUN, 8);
 241         scb->clear_nexus.ssp_task.tag = tascb->tag;
 242         if (task->dev->tproto)
 243                 scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
 244                                                           task->dev->lldd_dev);
 245         CLEAR_NEXUS_POST;
 246 }
 247
 248 static int asd_clear_nexus_index(struct sas_task *task)
 249 {
 250         struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
 251         struct asd_ascb *tascb = task->lldd_task;
 252
 253         CLEAR_NEXUS_PRE;
 254         scb->clear_nexus.nexus = NEXUS_TRANS_CX;
 255         if (task->dev->tproto)
 256                 scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
 257                                                           task->dev->lldd_dev);
 258         scb->clear_nexus.index = cpu_to_le16(tascb->tc_index);
 259         CLEAR_NEXUS_POST;
 260 }
 261
 262 /* ---------- TMFs ---------- */
 263
 264 static void asd_tmf_timedout(unsigned long data)
 265 {
 266         struct asd_ascb *ascb = (void *) data;
 267         struct tasklet_completion_status *tcs = ascb->uldd_task;
 268
 269         ASD_DPRINTK("tmf timed out\n");
 270         tcs->tmf_state = TMF_RESP_FUNC_FAILED;
 271         complete(ascb->completion);
 272 }
 273
 274 static int asd_get_tmf_resp_tasklet(struct asd_ascb *ascb,
 275                                     struct done_list_struct *dl)
 276 {
 277         struct asd_ha_struct *asd_ha = ascb->ha;
 278         unsigned long flags;
 279         struct tc_resp_sb_struct {
 280                 __le16 index_escb;
 281                 u8     len_lsb;
 282                 u8     flags;
 283         } __attribute__ ((packed)) *resp_sb = (void *) dl->status_block;
 284
 285         int  edb_id = ((resp_sb->flags & 0x70) >> 4)-1;
 286         struct asd_ascb *escb;
 287         struct asd_dma_tok *edb;
 288         struct ssp_frame_hdr *fh;
 289         struct ssp_response_iu   *ru;
 290         int res = TMF_RESP_FUNC_FAILED;
 291
 292         ASD_DPRINTK("tmf resp tasklet\n");
 293
 294         spin_lock_irqsave(&asd_ha->seq.tc_index_lock, flags);
 295         escb = asd_tc_index_find(&asd_ha->seq,
 296                                  (int)le16_to_cpu(resp_sb->index_escb));
 297         spin_unlock_irqrestore(&asd_ha->seq.tc_index_lock, flags);
 298
 299         if (!escb) {
 300                 ASD_DPRINTK("Uh-oh! No escb for this dl?!\n");
 301                 return res;
 302         }
 303
 304         edb = asd_ha->seq.edb_arr[edb_id + escb->edb_index];
 305         ascb->tag = *(__be16 *)(edb->vaddr+4);
 306         fh = edb->vaddr + 16;
 307         ru = edb->vaddr + 16 + sizeof(*fh);
 308         res = ru->status;
 309         if (ru->datapres == 1)    /* Response data present */
 310                 res = ru->resp_data[3];
 311 #if 0
 312         ascb->tag = fh->tag;
 313 #endif
 314         ascb->tag_valid = 1;
 315
 316         asd_invalidate_edb(escb, edb_id);
 317         return res;
 318 }
 319
 320 static void asd_tmf_tasklet_complete(struct asd_ascb *ascb,
 321                                      struct done_list_struct *dl)
 322 {
 323         struct tasklet_completion_status *tcs;
 324
 325         if (!del_timer(&ascb->timer))
 326                 return;
 327
 328         tcs = ascb->uldd_task;
 329         ASD_DPRINTK("tmf tasklet complete\n");
 330
 331         tcs->dl_opcode = dl->opcode;
 332
 333         if (dl->opcode == TC_SSP_RESP) {
 334                 tcs->tmf_state = asd_get_tmf_resp_tasklet(ascb, dl);
 335                 tcs->tag_valid = ascb->tag_valid;
 336                 tcs->tag = ascb->tag;
 337         }
 338
 339         complete(ascb->completion);
 340         asd_ascb_free(ascb);
 341 }
 342
 343 static int asd_clear_nexus(struct sas_task *task)
 344 {
 345         int res = TMF_RESP_FUNC_FAILED;
 346         int leftover;
 347         struct asd_ascb *tascb = task->lldd_task;
 348         DECLARE_COMPLETION_ONSTACK(completion);
 349         unsigned long flags;
 350
 351         tascb->completion = &completion;
 352
 353         ASD_DPRINTK("task not done, clearing nexus\n");
 354         if (tascb->tag_valid)
 355                 res = asd_clear_nexus_tag(task);
 356         else
 357                 res = asd_clear_nexus_index(task);
 358         leftover = wait_for_completion_timeout(&completion,
 359                                                AIC94XX_SCB_TIMEOUT);
 360         tascb->completion = NULL;
 361         ASD_DPRINTK("came back from clear nexus\n");
 362         spin_lock_irqsave(&task->task_state_lock, flags);
 363         if (leftover < 1)
 364                 res = TMF_RESP_FUNC_FAILED;
 365         if (task->task_state_flags & SAS_TASK_STATE_DONE)
 366                 res = TMF_RESP_FUNC_COMPLETE;
 367         spin_unlock_irqrestore(&task->task_state_lock, flags);
 368
 369         return res;
 370 }
 371
 372 /**
 373  * asd_abort_task -- ABORT TASK TMF
 374  * @task: the task to be aborted
 375  *
 376  * Before calling ABORT TASK the task state flags should be ORed with
 377  * SAS_TASK_STATE_ABORTED (unless SAS_TASK_STATE_DONE is set) under
 378  * the task_state_lock IRQ spinlock, then ABORT TASK *must* be called.
 379  *
 380  * Implements the ABORT TASK TMF, I_T_L_Q nexus.
 381  * Returns: SAS TMF responses (see sas_task.h),
 382  *          -ENOMEM,
 383  *          -SAS_QUEUE_FULL.
 384  *
 385  * When ABORT TASK returns, the caller of ABORT TASK checks first the
 386  * task->task_state_flags, and then the return value of ABORT TASK.
 387  *
 388  * If the task has task state bit SAS_TASK_STATE_DONE set, then the
 389  * task was completed successfully prior to it being aborted.  The
 390  * caller of ABORT TASK has responsibility to call task->task_done()
 391  * xor free the task, depending on their framework.  The return code
 392  * is TMF_RESP_FUNC_FAILED in this case.
 393  *
 394  * Else the SAS_TASK_STATE_DONE bit is not set,
 395  *      If the return code is TMF_RESP_FUNC_COMPLETE, then
 396  *              the task was aborted successfully.  The caller of
 397  *              ABORT TASK has responsibility to call task->task_done()
 398  *              to finish the task, xor free the task depending on their
 399  *              framework.
 400  *      else
 401  *              the ABORT TASK returned some kind of error. The task
 402  *              was _not_ cancelled.  Nothing can be assumed.
 403  *              The caller of ABORT TASK may wish to retry.
 404  */
 405 int asd_abort_task(struct sas_task *task)
 406 {
 407         struct asd_ascb *tascb = task->lldd_task;
 408         struct asd_ha_struct *asd_ha = tascb->ha;
 409         int res = 1;
 410         unsigned long flags;
 411         struct asd_ascb *ascb = NULL;
 412         struct scb *scb;
 413         int leftover;
 414         DECLARE_TCS(tcs);
 415         DECLARE_COMPLETION_ONSTACK(completion);
 416         DECLARE_COMPLETION_ONSTACK(tascb_completion);
 417
 418         tascb->completion = &tascb_completion;
 419
 420         spin_lock_irqsave(&task->task_state_lock, flags);
 421         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 422                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 423                 res = TMF_RESP_FUNC_COMPLETE;
 424                 ASD_DPRINTK("%s: task 0x%p done\n", __func__, task);
 425                 goto out_done;
 426         }
 427         spin_unlock_irqrestore(&task->task_state_lock, flags);
 428
 429         ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
 430         if (!ascb)
 431                 return -ENOMEM;
 432
 433         ascb->uldd_task = &tcs;
 434         ascb->completion = &completion;
 435         scb = ascb->scb;
 436         scb->header.opcode = SCB_ABORT_TASK;
 437
 438         switch (task->task_proto) {
 439         case SAS_PROTOCOL_SATA:
 440         case SAS_PROTOCOL_STP:
 441                 scb->abort_task.proto_conn_rate = (1 << 5); /* STP */
 442                 break;
 443         case SAS_PROTOCOL_SSP:
 444                 scb->abort_task.proto_conn_rate  = (1 << 4); /* SSP */
 445                 scb->abort_task.proto_conn_rate |= task->dev->linkrate;
 446                 break;
 447         case SAS_PROTOCOL_SMP:
 448                 break;
 449         default:
 450                 break;
 451         }
 452
 453         if (task->task_proto == SAS_PROTOCOL_SSP) {
 454                 scb->abort_task.ssp_frame.frame_type = SSP_TASK;
 455                 memcpy(scb->abort_task.ssp_frame.hashed_dest_addr,
 456                        task->dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
 457                 memcpy(scb->abort_task.ssp_frame.hashed_src_addr,
 458                        task->dev->port->ha->hashed_sas_addr,
 459                        HASHED_SAS_ADDR_SIZE);
 460                 scb->abort_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);
 461
 462                 memcpy(scb->abort_task.ssp_task.lun, task->ssp_task.LUN, 8);
 463                 scb->abort_task.ssp_task.tmf = TMF_ABORT_TASK;
 464                 scb->abort_task.ssp_task.tag = cpu_to_be16(0xFFFF);
 465         }
 466
 467         scb->abort_task.sister_scb = cpu_to_le16(0xFFFF);
 468         scb->abort_task.conn_handle = cpu_to_le16(
 469                 (u16)(unsigned long)task->dev->lldd_dev);
 470         scb->abort_task.retry_count = 1;
 471         scb->abort_task.index = cpu_to_le16((u16)tascb->tc_index);
 472         scb->abort_task.itnl_to = cpu_to_le16(ITNL_TIMEOUT_CONST);
 473
 474         res = asd_enqueue_internal(ascb, asd_tmf_tasklet_complete,
 475                                    asd_tmf_timedout);
 476         if (res)
 477                 goto out_free;
 478         wait_for_completion(&completion);
 479         ASD_DPRINTK("tmf came back\n");
 480
 481         tascb->tag = tcs.tag;
 482         tascb->tag_valid = tcs.tag_valid;
 483
 484         spin_lock_irqsave(&task->task_state_lock, flags);
 485         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 486                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 487                 res = TMF_RESP_FUNC_COMPLETE;
 488                 ASD_DPRINTK("%s: task 0x%p done\n", __func__, task);
 489                 goto out_done;
 490         }
 491         spin_unlock_irqrestore(&task->task_state_lock, flags);
 492
 493         if (tcs.dl_opcode == TC_SSP_RESP) {
 494                 /* The task to be aborted has been sent to the device.
 495                  * We got a Response IU for the ABORT TASK TMF. */
 496                 if (tcs.tmf_state == TMF_RESP_FUNC_COMPLETE)
 497                         res = asd_clear_nexus(task);
 498                 else
 499                         res = tcs.tmf_state;
 500         } else if (tcs.dl_opcode == TC_NO_ERROR &&
 501                    tcs.tmf_state == TMF_RESP_FUNC_FAILED) {
 502                 /* timeout */
 503                 res = TMF_RESP_FUNC_FAILED;
 504         } else {
 505                 /* In the following we assume that the managing layer
 506                  * will _never_ make a mistake, when issuing ABORT
 507                  * TASK.
 508                  */
 509                 switch (tcs.dl_opcode) {
 510                 default:
 511                         res = asd_clear_nexus(task);
 512                         /* fallthrough */
 513                 case TC_NO_ERROR:
 514                         break;
 515                         /* The task hasn't been sent to the device xor
 516                          * we never got a (sane) Response IU for the
 517                          * ABORT TASK TMF.
 518                          */
 519                 case TF_NAK_RECV:
 520                         res = TMF_RESP_INVALID_FRAME;
 521                         break;
 522                 case TF_TMF_TASK_DONE:  /* done but not reported yet */
 523                         res = TMF_RESP_FUNC_FAILED;
 524                         leftover =
 525                                 wait_for_completion_timeout(&tascb_completion,
 526                                                           AIC94XX_SCB_TIMEOUT);
 527                         spin_lock_irqsave(&task->task_state_lock, flags);
 528                         if (leftover < 1)
 529                                 res = TMF_RESP_FUNC_FAILED;
 530                         if (task->task_state_flags & SAS_TASK_STATE_DONE)
 531                                 res = TMF_RESP_FUNC_COMPLETE;
 532                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 533                         break;
 534                 case TF_TMF_NO_TAG:
 535                 case TF_TMF_TAG_FREE: /* the tag is in the free list */
 536                 case TF_TMF_NO_CONN_HANDLE: /* no such device */
 537                         res = TMF_RESP_FUNC_COMPLETE;
 538                         break;
 539                 case TF_TMF_NO_CTX: /* not in seq, or proto != SSP */
 540                         res = TMF_RESP_FUNC_ESUPP;
 541                         break;
 542                 }
 543         }
 544  out_done:
 545         tascb->completion = NULL;
 546         if (res == TMF_RESP_FUNC_COMPLETE) {
 547                 task->lldd_task = NULL;
 548                 mb();
 549                 asd_ascb_free(tascb);
 550         }
 551         ASD_DPRINTK("task 0x%p aborted, res: 0x%x\n", task, res);
 552         return res;
 553
 554  out_free:
 555         asd_ascb_free(ascb);
 556         ASD_DPRINTK("task 0x%p aborted, res: 0x%x\n", task, res);
 557         return res;
 558 }
 559
 560 /**
 561  * asd_initiate_ssp_tmf -- send a TMF to an I_T_L or I_T_L_Q nexus
 562  * @dev: pointer to struct domain_device of interest
 563  * @lun: pointer to u8[8] which is the LUN
 564  * @tmf: the TMF to be performed (see sas_task.h or the SAS spec)
 565  * @index: the transaction context of the task to be queried if QT TMF
 566  *
 567  * This function is used to send ABORT TASK SET, CLEAR ACA,
 568  * CLEAR TASK SET, LU RESET and QUERY TASK TMFs.
 569  *
 570  * No SCBs should be queued to the I_T_L nexus when this SCB is
 571  * pending.
 572  *
 573  * Returns: TMF response code (see sas_task.h or the SAS spec)
 574  */
 575 static int asd_initiate_ssp_tmf(struct domain_device *dev, u8 *lun,
 576                                 int tmf, int index)
 577 {
 578         struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
 579         struct asd_ascb *ascb;
 580         int res = 1;
 581         struct scb *scb;
 582         DECLARE_COMPLETION_ONSTACK(completion);
 583         DECLARE_TCS(tcs);
 584
 585         if (!(dev->tproto & SAS_PROTOCOL_SSP))
 586                 return TMF_RESP_FUNC_ESUPP;
 587
 588         ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
 589         if (!ascb)
 590                 return -ENOMEM;
 591
 592         ascb->completion = &completion;
 593         ascb->uldd_task = &tcs;
 594         scb = ascb->scb;
 595
 596         if (tmf == TMF_QUERY_TASK)
 597                 scb->header.opcode = QUERY_SSP_TASK;
 598         else
 599                 scb->header.opcode = INITIATE_SSP_TMF;
 600
 601         scb->ssp_tmf.proto_conn_rate  = (1 << 4); /* SSP */
 602         scb->ssp_tmf.proto_conn_rate |= dev->linkrate;
 603         /* SSP frame header */
 604         scb->ssp_tmf.ssp_frame.frame_type = SSP_TASK;
 605         memcpy(scb->ssp_tmf.ssp_frame.hashed_dest_addr,
 606                dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
 607         memcpy(scb->ssp_tmf.ssp_frame.hashed_src_addr,
 608                dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
 609         scb->ssp_tmf.ssp_frame.tptt = cpu_to_be16(0xFFFF);
 610         /* SSP Task IU */
 611         memcpy(scb->ssp_tmf.ssp_task.lun, lun, 8);
 612         scb->ssp_tmf.ssp_task.tmf = tmf;
 613
 614         scb->ssp_tmf.sister_scb = cpu_to_le16(0xFFFF);
 615         scb->ssp_tmf.conn_handle= cpu_to_le16((u16)(unsigned long)
 616                                               dev->lldd_dev);
 617         scb->ssp_tmf.retry_count = 1;
 618         scb->ssp_tmf.itnl_to = cpu_to_le16(ITNL_TIMEOUT_CONST);
 619         if (tmf == TMF_QUERY_TASK)
 620                 scb->ssp_tmf.index = cpu_to_le16(index);
 621
 622         res = asd_enqueue_internal(ascb, asd_tmf_tasklet_complete,
 623                                    asd_tmf_timedout);
 624         if (res)
 625                 goto out_err;
 626         wait_for_completion(&completion);
 627
 628         switch (tcs.dl_opcode) {
 629         case TC_NO_ERROR:
 630                 res = TMF_RESP_FUNC_COMPLETE;
 631                 break;
 632         case TF_NAK_RECV:
 633                 res = TMF_RESP_INVALID_FRAME;
 634                 break;
 635         case TF_TMF_TASK_DONE:
 636                 res = TMF_RESP_FUNC_FAILED;
 637                 break;
 638         case TF_TMF_NO_TAG:
 639         case TF_TMF_TAG_FREE: /* the tag is in the free list */
 640         case TF_TMF_NO_CONN_HANDLE: /* no such device */
 641                 res = TMF_RESP_FUNC_COMPLETE;
 642                 break;
 643         case TF_TMF_NO_CTX: /* not in seq, or proto != SSP */
 644                 res = TMF_RESP_FUNC_ESUPP;
 645                 break;
 646         default:
 647                 /* Allow TMF response codes to propagate upwards */
 648                 res = tcs.dl_opcode;
 649                 break;
 650         }
 651         return res;
 652 out_err:
 653         asd_ascb_free(ascb);
 654         return res;
 655 }
 656
 657 int asd_abort_task_set(struct domain_device *dev, u8 *lun)
 658 {
 659         int res = asd_initiate_ssp_tmf(dev, lun, TMF_ABORT_TASK_SET, 0);
 660
 661         if (res == TMF_RESP_FUNC_COMPLETE)
 662                 asd_clear_nexus_I_T_L(dev, lun);
 663         return res;
 664 }
 665
 666 int asd_clear_aca(struct domain_device *dev, u8 *lun)
 667 {
 668         int res = asd_initiate_ssp_tmf(dev, lun, TMF_CLEAR_ACA, 0);
 669
 670         if (res == TMF_RESP_FUNC_COMPLETE)
 671                 asd_clear_nexus_I_T_L(dev, lun);
 672         return res;
 673 }
 674
 675 int asd_clear_task_set(struct domain_device *dev, u8 *lun)
 676 {
 677         int res = asd_initiate_ssp_tmf(dev, lun, TMF_CLEAR_TASK_SET, 0);
 678
 679         if (res == TMF_RESP_FUNC_COMPLETE)
 680                 asd_clear_nexus_I_T_L(dev, lun);
 681         return res;
 682 }
 683
 684 int asd_lu_reset(struct domain_device *dev, u8 *lun)
 685 {
 686         int res = asd_initiate_ssp_tmf(dev, lun, TMF_LU_RESET, 0);
 687
 688         if (res == TMF_RESP_FUNC_COMPLETE)
 689                 asd_clear_nexus_I_T_L(dev, lun);
 690         return res;
 691 }
 692
 693 /**
 694  * asd_query_task -- send a QUERY TASK TMF to an I_T_L_Q nexus
 695  * task: pointer to sas_task struct of interest
 696  *
 697  * Returns: TMF_RESP_FUNC_COMPLETE if the task is not in the task set,
 698  * or TMF_RESP_FUNC_SUCC if the task is in the task set.
 699  *
 700  * Normally the management layer sets the task to aborted state,
 701  * and then calls query task and then abort task.
 702  */
 703 int asd_query_task(struct sas_task *task)
 704 {
 705         struct asd_ascb *ascb = task->lldd_task;
 706         int index;
 707
 708         if (ascb) {
 709                 index = ascb->tc_index;
 710                 return asd_initiate_ssp_tmf(task->dev, task->ssp_task.LUN,
 711                                             TMF_QUERY_TASK, index);
 712         }
 713         return TMF_RESP_FUNC_COMPLETE;
 714 }