drivers/scsi/aic94xx/aic94xx

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This source file includes following definitions.
asd_enqueue_internal
asd_clear_nexus_tasklet_complete
asd_clear_nexus_timedout
asd_clear_nexus_ha
asd_clear_nexus_port
asd_clear_nexus_I_T
asd_I_T_nexus_reset
asd_clear_nexus_I_T_L
asd_clear_nexus_tag
asd_clear_nexus_index
asd_tmf_timedout
asd_get_tmf_resp_tasklet
asd_tmf_tasklet_complete
asd_clear_nexus
asd_abort_task
asd_initiate_ssp_tmf
asd_abort_task_set
asd_clear_aca
asd_clear_task_set
asd_lu_reset
asd_query_task
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Aic94xx Task Management Functions
   4  *
   5  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   6  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   7  */
   8 
   9 #include <linux/spinlock.h>
  10 #include <linux/gfp.h>
  11 #include "aic94xx.h"
  12 #include "aic94xx_sas.h"
  13 #include "aic94xx_hwi.h"
  14 
  15 /* ---------- Internal enqueue ---------- */
  16 
  17 static int asd_enqueue_internal(struct asd_ascb *ascb,
  18                 void (*tasklet_complete)(struct asd_ascb *,
  19                                          struct done_list_struct *),
  20                                 void (*timed_out)(struct timer_list *t))
  21 {
  22         int res;
  23 
  24         ascb->tasklet_complete = tasklet_complete;
  25         ascb->uldd_timer = 1;
  26 
  27         ascb->timer.function = timed_out;
  28         ascb->timer.expires = jiffies + AIC94XX_SCB_TIMEOUT;
  29 
  30         add_timer(&ascb->timer);
  31 
  32         res = asd_post_ascb_list(ascb->ha, ascb, 1);
  33         if (unlikely(res))
  34                 del_timer(&ascb->timer);
  35         return res;
  36 }
  37 
  38 /* ---------- CLEAR NEXUS ---------- */
  39 
  40 struct tasklet_completion_status {
  41         int     dl_opcode;
  42         int     tmf_state;
  43         u8      tag_valid:1;
  44         __be16  tag;
  45 };
  46 
  47 #define DECLARE_TCS(tcs) \
  48         struct tasklet_completion_status tcs = { \
  49                 .dl_opcode = 0, \
  50                 .tmf_state = 0, \
  51                 .tag_valid = 0, \
  52                 .tag = 0, \
  53         }
  54 
  55 
  56 static void asd_clear_nexus_tasklet_complete(struct asd_ascb *ascb,
  57                                              struct done_list_struct *dl)
  58 {
  59         struct tasklet_completion_status *tcs = ascb->uldd_task;
  60         ASD_DPRINTK("%s: here\n", __func__);
  61         if (!del_timer(&ascb->timer)) {
  62                 ASD_DPRINTK("%s: couldn't delete timer\n", __func__);
  63                 return;
  64         }
  65         ASD_DPRINTK("%s: opcode: 0x%x\n", __func__, dl->opcode);
  66         tcs->dl_opcode = dl->opcode;
  67         complete(ascb->completion);
  68         asd_ascb_free(ascb);
  69 }
  70 
  71 static void asd_clear_nexus_timedout(struct timer_list *t)
  72 {
  73         struct asd_ascb *ascb = from_timer(ascb, t, timer);
  74         struct tasklet_completion_status *tcs = ascb->uldd_task;
  75 
  76         ASD_DPRINTK("%s: here\n", __func__);
  77         tcs->dl_opcode = TMF_RESP_FUNC_FAILED;
  78         complete(ascb->completion);
  79 }
  80 
  81 #define CLEAR_NEXUS_PRE         \
  82         struct asd_ascb *ascb; \
  83         struct scb *scb; \
  84         int res; \
  85         DECLARE_COMPLETION_ONSTACK(completion); \
  86         DECLARE_TCS(tcs); \
  87                 \
  88         ASD_DPRINTK("%s: PRE\n", __func__); \
  89         res = 1;                \
  90         ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL); \
  91         if (!ascb)              \
  92                 return -ENOMEM; \
  93                                 \
  94         ascb->completion = &completion; \
  95         ascb->uldd_task = &tcs; \
  96         scb = ascb->scb;        \
  97         scb->header.opcode = CLEAR_NEXUS
  98 
  99 #define CLEAR_NEXUS_POST        \
 100         ASD_DPRINTK("%s: POST\n", __func__); \
 101         res = asd_enqueue_internal(ascb, asd_clear_nexus_tasklet_complete, \
 102                                    asd_clear_nexus_timedout);              \
 103         if (res)                \
 104                 goto out_err;   \
 105         ASD_DPRINTK("%s: clear nexus posted, waiting...\n", __func__); \
 106         wait_for_completion(&completion); \
 107         res = tcs.dl_opcode; \
 108         if (res == TC_NO_ERROR) \
 109                 res = TMF_RESP_FUNC_COMPLETE;   \
 110         return res; \
 111 out_err:                        \
 112         asd_ascb_free(ascb);    \
 113         return res
 114 
 115 int asd_clear_nexus_ha(struct sas_ha_struct *sas_ha)
 116 {
 117         struct asd_ha_struct *asd_ha = sas_ha->lldd_ha;
 118 
 119         CLEAR_NEXUS_PRE;
 120         scb->clear_nexus.nexus = NEXUS_ADAPTER;
 121         CLEAR_NEXUS_POST;
 122 }
 123 
 124 int asd_clear_nexus_port(struct asd_sas_port *port)
 125 {
 126         struct asd_ha_struct *asd_ha = port->ha->lldd_ha;
 127 
 128         CLEAR_NEXUS_PRE;
 129         scb->clear_nexus.nexus = NEXUS_PORT;
 130         scb->clear_nexus.conn_mask = port->phy_mask;
 131         CLEAR_NEXUS_POST;
 132 }
 133 
 134 enum clear_nexus_phase {
 135         NEXUS_PHASE_PRE,
 136         NEXUS_PHASE_POST,
 137         NEXUS_PHASE_RESUME,
 138 };
 139 
 140 static int asd_clear_nexus_I_T(struct domain_device *dev,
 141                                enum clear_nexus_phase phase)
 142 {
 143         struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
 144 
 145         CLEAR_NEXUS_PRE;
 146         scb->clear_nexus.nexus = NEXUS_I_T;
 147         switch (phase) {
 148         case NEXUS_PHASE_PRE:
 149                 scb->clear_nexus.flags = EXEC_Q | SUSPEND_TX;
 150                 break;
 151         case NEXUS_PHASE_POST:
 152                 scb->clear_nexus.flags = SEND_Q | NOTINQ;
 153                 break;
 154         case NEXUS_PHASE_RESUME:
 155                 scb->clear_nexus.flags = RESUME_TX;
 156         }
 157         scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
 158                                                    dev->lldd_dev);
 159         CLEAR_NEXUS_POST;
 160 }
 161 
 162 int asd_I_T_nexus_reset(struct domain_device *dev)
 163 {
 164         int res, tmp_res, i;
 165         struct sas_phy *phy = sas_get_local_phy(dev);
 166         /* Standard mandates link reset for ATA  (type 0) and
 167          * hard reset for SSP (type 1) */
 168         int reset_type = (dev->dev_type == SAS_SATA_DEV ||
 169                           (dev->tproto & SAS_PROTOCOL_STP)) ? 0 : 1;
 170 
 171         asd_clear_nexus_I_T(dev, NEXUS_PHASE_PRE);
 172         /* send a hard reset */
 173         ASD_DPRINTK("sending %s reset to %s\n",
 174                     reset_type ? "hard" : "soft", dev_name(&phy->dev));
 175         res = sas_phy_reset(phy, reset_type);
 176         if (res == TMF_RESP_FUNC_COMPLETE || res == -ENODEV) {
 177                 /* wait for the maximum settle time */
 178                 msleep(500);
 179                 /* clear all outstanding commands (keep nexus suspended) */
 180                 asd_clear_nexus_I_T(dev, NEXUS_PHASE_POST);
 181         }
 182         for (i = 0 ; i < 3; i++) {
 183                 tmp_res = asd_clear_nexus_I_T(dev, NEXUS_PHASE_RESUME);
 184                 if (tmp_res == TC_RESUME)
 185                         goto out;
 186                 msleep(500);
 187         }
 188 
 189         /* This is a bit of a problem:  the sequencer is still suspended
 190          * and is refusing to resume.  Hope it will resume on a bigger hammer
 191          * or the disk is lost */
 192         dev_printk(KERN_ERR, &phy->dev,
 193                    "Failed to resume nexus after reset 0x%x\n", tmp_res);
 194 
 195         res = TMF_RESP_FUNC_FAILED;
 196  out:
 197         sas_put_local_phy(phy);
 198         return res;
 199 }
 200 
 201 static int asd_clear_nexus_I_T_L(struct domain_device *dev, u8 *lun)
 202 {
 203         struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
 204 
 205         CLEAR_NEXUS_PRE;
 206         scb->clear_nexus.nexus = NEXUS_I_T_L;
 207         scb->clear_nexus.flags = SEND_Q | EXEC_Q | NOTINQ;
 208         memcpy(scb->clear_nexus.ssp_task.lun, lun, 8);
 209         scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
 210                                                    dev->lldd_dev);
 211         CLEAR_NEXUS_POST;
 212 }
 213 
 214 static int asd_clear_nexus_tag(struct sas_task *task)
 215 {
 216         struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
 217         struct asd_ascb *tascb = task->lldd_task;
 218 
 219         CLEAR_NEXUS_PRE;
 220         scb->clear_nexus.nexus = NEXUS_TAG;
 221         memcpy(scb->clear_nexus.ssp_task.lun, task->ssp_task.LUN, 8);
 222         scb->clear_nexus.ssp_task.tag = tascb->tag;
 223         if (task->dev->tproto)
 224                 scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
 225                                                           task->dev->lldd_dev);
 226         CLEAR_NEXUS_POST;
 227 }
 228 
 229 static int asd_clear_nexus_index(struct sas_task *task)
 230 {
 231         struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
 232         struct asd_ascb *tascb = task->lldd_task;
 233 
 234         CLEAR_NEXUS_PRE;
 235         scb->clear_nexus.nexus = NEXUS_TRANS_CX;
 236         if (task->dev->tproto)
 237                 scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
 238                                                           task->dev->lldd_dev);
 239         scb->clear_nexus.index = cpu_to_le16(tascb->tc_index);
 240         CLEAR_NEXUS_POST;
 241 }
 242 
 243 /* ---------- TMFs ---------- */
 244 
 245 static void asd_tmf_timedout(struct timer_list *t)
 246 {
 247         struct asd_ascb *ascb = from_timer(ascb, t, timer);
 248         struct tasklet_completion_status *tcs = ascb->uldd_task;
 249 
 250         ASD_DPRINTK("tmf timed out\n");
 251         tcs->tmf_state = TMF_RESP_FUNC_FAILED;
 252         complete(ascb->completion);
 253 }
 254 
 255 static int asd_get_tmf_resp_tasklet(struct asd_ascb *ascb,
 256                                     struct done_list_struct *dl)
 257 {
 258         struct asd_ha_struct *asd_ha = ascb->ha;
 259         unsigned long flags;
 260         struct tc_resp_sb_struct {
 261                 __le16 index_escb;
 262                 u8     len_lsb;
 263                 u8     flags;
 264         } __attribute__ ((packed)) *resp_sb = (void *) dl->status_block;
 265 
 266         int  edb_id = ((resp_sb->flags & 0x70) >> 4)-1;
 267         struct asd_ascb *escb;
 268         struct asd_dma_tok *edb;
 269         struct ssp_frame_hdr *fh;
 270         struct ssp_response_iu   *ru;
 271         int res = TMF_RESP_FUNC_FAILED;
 272 
 273         ASD_DPRINTK("tmf resp tasklet\n");
 274 
 275         spin_lock_irqsave(&asd_ha->seq.tc_index_lock, flags);
 276         escb = asd_tc_index_find(&asd_ha->seq,
 277                                  (int)le16_to_cpu(resp_sb->index_escb));
 278         spin_unlock_irqrestore(&asd_ha->seq.tc_index_lock, flags);
 279 
 280         if (!escb) {
 281                 ASD_DPRINTK("Uh-oh! No escb for this dl?!\n");
 282                 return res;
 283         }
 284 
 285         edb = asd_ha->seq.edb_arr[edb_id + escb->edb_index];
 286         ascb->tag = *(__be16 *)(edb->vaddr+4);
 287         fh = edb->vaddr + 16;
 288         ru = edb->vaddr + 16 + sizeof(*fh);
 289         res = ru->status;
 290         if (ru->datapres == 1)    /* Response data present */
 291                 res = ru->resp_data[3];
 292 #if 0
 293         ascb->tag = fh->tag;
 294 #endif
 295         ascb->tag_valid = 1;
 296 
 297         asd_invalidate_edb(escb, edb_id);
 298         return res;
 299 }
 300 
 301 static void asd_tmf_tasklet_complete(struct asd_ascb *ascb,
 302                                      struct done_list_struct *dl)
 303 {
 304         struct tasklet_completion_status *tcs;
 305 
 306         if (!del_timer(&ascb->timer))
 307                 return;
 308 
 309         tcs = ascb->uldd_task;
 310         ASD_DPRINTK("tmf tasklet complete\n");
 311 
 312         tcs->dl_opcode = dl->opcode;
 313 
 314         if (dl->opcode == TC_SSP_RESP) {
 315                 tcs->tmf_state = asd_get_tmf_resp_tasklet(ascb, dl);
 316                 tcs->tag_valid = ascb->tag_valid;
 317                 tcs->tag = ascb->tag;
 318         }
 319 
 320         complete(ascb->completion);
 321         asd_ascb_free(ascb);
 322 }
 323 
 324 static int asd_clear_nexus(struct sas_task *task)
 325 {
 326         int res = TMF_RESP_FUNC_FAILED;
 327         int leftover;
 328         struct asd_ascb *tascb = task->lldd_task;
 329         DECLARE_COMPLETION_ONSTACK(completion);
 330         unsigned long flags;
 331 
 332         tascb->completion = &completion;
 333 
 334         ASD_DPRINTK("task not done, clearing nexus\n");
 335         if (tascb->tag_valid)
 336                 res = asd_clear_nexus_tag(task);
 337         else
 338                 res = asd_clear_nexus_index(task);
 339         leftover = wait_for_completion_timeout(&completion,
 340                                                AIC94XX_SCB_TIMEOUT);
 341         tascb->completion = NULL;
 342         ASD_DPRINTK("came back from clear nexus\n");
 343         spin_lock_irqsave(&task->task_state_lock, flags);
 344         if (leftover < 1)
 345                 res = TMF_RESP_FUNC_FAILED;
 346         if (task->task_state_flags & SAS_TASK_STATE_DONE)
 347                 res = TMF_RESP_FUNC_COMPLETE;
 348         spin_unlock_irqrestore(&task->task_state_lock, flags);
 349 
 350         return res;
 351 }
 352 
 353 /**
 354  * asd_abort_task -- ABORT TASK TMF
 355  * @task: the task to be aborted
 356  *
 357  * Before calling ABORT TASK the task state flags should be ORed with
 358  * SAS_TASK_STATE_ABORTED (unless SAS_TASK_STATE_DONE is set) under
 359  * the task_state_lock IRQ spinlock, then ABORT TASK *must* be called.
 360  *
 361  * Implements the ABORT TASK TMF, I_T_L_Q nexus.
 362  * Returns: SAS TMF responses (see sas_task.h),
 363  *          -ENOMEM,
 364  *          -SAS_QUEUE_FULL.
 365  *
 366  * When ABORT TASK returns, the caller of ABORT TASK checks first the
 367  * task->task_state_flags, and then the return value of ABORT TASK.
 368  *
 369  * If the task has task state bit SAS_TASK_STATE_DONE set, then the
 370  * task was completed successfully prior to it being aborted.  The
 371  * caller of ABORT TASK has responsibility to call task->task_done()
 372  * xor free the task, depending on their framework.  The return code
 373  * is TMF_RESP_FUNC_FAILED in this case.
 374  *
 375  * Else the SAS_TASK_STATE_DONE bit is not set,
 376  *      If the return code is TMF_RESP_FUNC_COMPLETE, then
 377  *              the task was aborted successfully.  The caller of
 378  *              ABORT TASK has responsibility to call task->task_done()
 379  *              to finish the task, xor free the task depending on their
 380  *              framework.
 381  *      else
 382  *              the ABORT TASK returned some kind of error. The task
 383  *              was _not_ cancelled.  Nothing can be assumed.
 384  *              The caller of ABORT TASK may wish to retry.
 385  */
 386 int asd_abort_task(struct sas_task *task)
 387 {
 388         struct asd_ascb *tascb = task->lldd_task;
 389         struct asd_ha_struct *asd_ha = tascb->ha;
 390         int res = 1;
 391         unsigned long flags;
 392         struct asd_ascb *ascb = NULL;
 393         struct scb *scb;
 394         int leftover;
 395         DECLARE_TCS(tcs);
 396         DECLARE_COMPLETION_ONSTACK(completion);
 397         DECLARE_COMPLETION_ONSTACK(tascb_completion);
 398 
 399         tascb->completion = &tascb_completion;
 400 
 401         spin_lock_irqsave(&task->task_state_lock, flags);
 402         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 403                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 404                 res = TMF_RESP_FUNC_COMPLETE;
 405                 ASD_DPRINTK("%s: task 0x%p done\n", __func__, task);
 406                 goto out_done;
 407         }
 408         spin_unlock_irqrestore(&task->task_state_lock, flags);
 409 
 410         ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
 411         if (!ascb)
 412                 return -ENOMEM;
 413 
 414         ascb->uldd_task = &tcs;
 415         ascb->completion = &completion;
 416         scb = ascb->scb;
 417         scb->header.opcode = SCB_ABORT_TASK;
 418 
 419         switch (task->task_proto) {
 420         case SAS_PROTOCOL_SATA:
 421         case SAS_PROTOCOL_STP:
 422                 scb->abort_task.proto_conn_rate = (1 << 5); /* STP */
 423                 break;
 424         case SAS_PROTOCOL_SSP:
 425                 scb->abort_task.proto_conn_rate  = (1 << 4); /* SSP */
 426                 scb->abort_task.proto_conn_rate |= task->dev->linkrate;
 427                 break;
 428         case SAS_PROTOCOL_SMP:
 429                 break;
 430         default:
 431                 break;
 432         }
 433 
 434         if (task->task_proto == SAS_PROTOCOL_SSP) {
 435                 scb->abort_task.ssp_frame.frame_type = SSP_TASK;
 436                 memcpy(scb->abort_task.ssp_frame.hashed_dest_addr,
 437                        task->dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
 438                 memcpy(scb->abort_task.ssp_frame.hashed_src_addr,
 439                        task->dev->port->ha->hashed_sas_addr,
 440                        HASHED_SAS_ADDR_SIZE);
 441                 scb->abort_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);
 442 
 443                 memcpy(scb->abort_task.ssp_task.lun, task->ssp_task.LUN, 8);
 444                 scb->abort_task.ssp_task.tmf = TMF_ABORT_TASK;
 445                 scb->abort_task.ssp_task.tag = cpu_to_be16(0xFFFF);
 446         }
 447 
 448         scb->abort_task.sister_scb = cpu_to_le16(0xFFFF);
 449         scb->abort_task.conn_handle = cpu_to_le16(
 450                 (u16)(unsigned long)task->dev->lldd_dev);
 451         scb->abort_task.retry_count = 1;
 452         scb->abort_task.index = cpu_to_le16((u16)tascb->tc_index);
 453         scb->abort_task.itnl_to = cpu_to_le16(ITNL_TIMEOUT_CONST);
 454 
 455         res = asd_enqueue_internal(ascb, asd_tmf_tasklet_complete,
 456                                    asd_tmf_timedout);
 457         if (res)
 458                 goto out_free;
 459         wait_for_completion(&completion);
 460         ASD_DPRINTK("tmf came back\n");
 461 
 462         tascb->tag = tcs.tag;
 463         tascb->tag_valid = tcs.tag_valid;
 464 
 465         spin_lock_irqsave(&task->task_state_lock, flags);
 466         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 467                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 468                 res = TMF_RESP_FUNC_COMPLETE;
 469                 ASD_DPRINTK("%s: task 0x%p done\n", __func__, task);
 470                 goto out_done;
 471         }
 472         spin_unlock_irqrestore(&task->task_state_lock, flags);
 473 
 474         if (tcs.dl_opcode == TC_SSP_RESP) {
 475                 /* The task to be aborted has been sent to the device.
 476                  * We got a Response IU for the ABORT TASK TMF. */
 477                 if (tcs.tmf_state == TMF_RESP_FUNC_COMPLETE)
 478                         res = asd_clear_nexus(task);
 479                 else
 480                         res = tcs.tmf_state;
 481         } else if (tcs.dl_opcode == TC_NO_ERROR &&
 482                    tcs.tmf_state == TMF_RESP_FUNC_FAILED) {
 483                 /* timeout */
 484                 res = TMF_RESP_FUNC_FAILED;
 485         } else {
 486                 /* In the following we assume that the managing layer
 487                  * will _never_ make a mistake, when issuing ABORT
 488                  * TASK.
 489                  */
 490                 switch (tcs.dl_opcode) {
 491                 default:
 492                         res = asd_clear_nexus(task);
 493                         /* fallthrough */
 494                 case TC_NO_ERROR:
 495                         break;
 496                         /* The task hasn't been sent to the device xor
 497                          * we never got a (sane) Response IU for the
 498                          * ABORT TASK TMF.
 499                          */
 500                 case TF_NAK_RECV:
 501                         res = TMF_RESP_INVALID_FRAME;
 502                         break;
 503                 case TF_TMF_TASK_DONE:  /* done but not reported yet */
 504                         res = TMF_RESP_FUNC_FAILED;
 505                         leftover =
 506                                 wait_for_completion_timeout(&tascb_completion,
 507                                                           AIC94XX_SCB_TIMEOUT);
 508                         spin_lock_irqsave(&task->task_state_lock, flags);
 509                         if (leftover < 1)
 510                                 res = TMF_RESP_FUNC_FAILED;
 511                         if (task->task_state_flags & SAS_TASK_STATE_DONE)
 512                                 res = TMF_RESP_FUNC_COMPLETE;
 513                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 514                         break;
 515                 case TF_TMF_NO_TAG:
 516                 case TF_TMF_TAG_FREE: /* the tag is in the free list */
 517                 case TF_TMF_NO_CONN_HANDLE: /* no such device */
 518                         res = TMF_RESP_FUNC_COMPLETE;
 519                         break;
 520                 case TF_TMF_NO_CTX: /* not in seq, or proto != SSP */
 521                         res = TMF_RESP_FUNC_ESUPP;
 522                         break;
 523                 }
 524         }
 525  out_done:
 526         tascb->completion = NULL;
 527         if (res == TMF_RESP_FUNC_COMPLETE) {
 528                 task->lldd_task = NULL;
 529                 mb();
 530                 asd_ascb_free(tascb);
 531         }
 532         ASD_DPRINTK("task 0x%p aborted, res: 0x%x\n", task, res);
 533         return res;
 534 
 535  out_free:
 536         asd_ascb_free(ascb);
 537         ASD_DPRINTK("task 0x%p aborted, res: 0x%x\n", task, res);
 538         return res;
 539 }
 540 
 541 /**
 542  * asd_initiate_ssp_tmf -- send a TMF to an I_T_L or I_T_L_Q nexus
 543  * @dev: pointer to struct domain_device of interest
 544  * @lun: pointer to u8[8] which is the LUN
 545  * @tmf: the TMF to be performed (see sas_task.h or the SAS spec)
 546  * @index: the transaction context of the task to be queried if QT TMF
 547  *
 548  * This function is used to send ABORT TASK SET, CLEAR ACA,
 549  * CLEAR TASK SET, LU RESET and QUERY TASK TMFs.
 550  *
 551  * No SCBs should be queued to the I_T_L nexus when this SCB is
 552  * pending.
 553  *
 554  * Returns: TMF response code (see sas_task.h or the SAS spec)
 555  */
 556 static int asd_initiate_ssp_tmf(struct domain_device *dev, u8 *lun,
 557                                 int tmf, int index)
 558 {
 559         struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
 560         struct asd_ascb *ascb;
 561         int res = 1;
 562         struct scb *scb;
 563         DECLARE_COMPLETION_ONSTACK(completion);
 564         DECLARE_TCS(tcs);
 565 
 566         if (!(dev->tproto & SAS_PROTOCOL_SSP))
 567                 return TMF_RESP_FUNC_ESUPP;
 568 
 569         ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
 570         if (!ascb)
 571                 return -ENOMEM;
 572 
 573         ascb->completion = &completion;
 574         ascb->uldd_task = &tcs;
 575         scb = ascb->scb;
 576 
 577         if (tmf == TMF_QUERY_TASK)
 578                 scb->header.opcode = QUERY_SSP_TASK;
 579         else
 580                 scb->header.opcode = INITIATE_SSP_TMF;
 581 
 582         scb->ssp_tmf.proto_conn_rate  = (1 << 4); /* SSP */
 583         scb->ssp_tmf.proto_conn_rate |= dev->linkrate;
 584         /* SSP frame header */
 585         scb->ssp_tmf.ssp_frame.frame_type = SSP_TASK;
 586         memcpy(scb->ssp_tmf.ssp_frame.hashed_dest_addr,
 587                dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
 588         memcpy(scb->ssp_tmf.ssp_frame.hashed_src_addr,
 589                dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
 590         scb->ssp_tmf.ssp_frame.tptt = cpu_to_be16(0xFFFF);
 591         /* SSP Task IU */
 592         memcpy(scb->ssp_tmf.ssp_task.lun, lun, 8);
 593         scb->ssp_tmf.ssp_task.tmf = tmf;
 594 
 595         scb->ssp_tmf.sister_scb = cpu_to_le16(0xFFFF);
 596         scb->ssp_tmf.conn_handle= cpu_to_le16((u16)(unsigned long)
 597                                               dev->lldd_dev);
 598         scb->ssp_tmf.retry_count = 1;
 599         scb->ssp_tmf.itnl_to = cpu_to_le16(ITNL_TIMEOUT_CONST);
 600         if (tmf == TMF_QUERY_TASK)
 601                 scb->ssp_tmf.index = cpu_to_le16(index);
 602 
 603         res = asd_enqueue_internal(ascb, asd_tmf_tasklet_complete,
 604                                    asd_tmf_timedout);
 605         if (res)
 606                 goto out_err;
 607         wait_for_completion(&completion);
 608 
 609         switch (tcs.dl_opcode) {
 610         case TC_NO_ERROR:
 611                 res = TMF_RESP_FUNC_COMPLETE;
 612                 break;
 613         case TF_NAK_RECV:
 614                 res = TMF_RESP_INVALID_FRAME;
 615                 break;
 616         case TF_TMF_TASK_DONE:
 617                 res = TMF_RESP_FUNC_FAILED;
 618                 break;
 619         case TF_TMF_NO_TAG:
 620         case TF_TMF_TAG_FREE: /* the tag is in the free list */
 621         case TF_TMF_NO_CONN_HANDLE: /* no such device */
 622                 res = TMF_RESP_FUNC_COMPLETE;
 623                 break;
 624         case TF_TMF_NO_CTX: /* not in seq, or proto != SSP */
 625                 res = TMF_RESP_FUNC_ESUPP;
 626                 break;
 627         default:
 628                 /* Allow TMF response codes to propagate upwards */
 629                 res = tcs.dl_opcode;
 630                 break;
 631         }
 632         return res;
 633 out_err:
 634         asd_ascb_free(ascb);
 635         return res;
 636 }
 637 
 638 int asd_abort_task_set(struct domain_device *dev, u8 *lun)
 639 {
 640         int res = asd_initiate_ssp_tmf(dev, lun, TMF_ABORT_TASK_SET, 0);
 641 
 642         if (res == TMF_RESP_FUNC_COMPLETE)
 643                 asd_clear_nexus_I_T_L(dev, lun);
 644         return res;
 645 }
 646 
 647 int asd_clear_aca(struct domain_device *dev, u8 *lun)
 648 {
 649         int res = asd_initiate_ssp_tmf(dev, lun, TMF_CLEAR_ACA, 0);
 650 
 651         if (res == TMF_RESP_FUNC_COMPLETE)
 652                 asd_clear_nexus_I_T_L(dev, lun);
 653         return res;
 654 }
 655 
 656 int asd_clear_task_set(struct domain_device *dev, u8 *lun)
 657 {
 658         int res = asd_initiate_ssp_tmf(dev, lun, TMF_CLEAR_TASK_SET, 0);
 659 
 660         if (res == TMF_RESP_FUNC_COMPLETE)
 661                 asd_clear_nexus_I_T_L(dev, lun);
 662         return res;
 663 }
 664 
 665 int asd_lu_reset(struct domain_device *dev, u8 *lun)
 666 {
 667         int res = asd_initiate_ssp_tmf(dev, lun, TMF_LU_RESET, 0);
 668 
 669         if (res == TMF_RESP_FUNC_COMPLETE)
 670                 asd_clear_nexus_I_T_L(dev, lun);
 671         return res;
 672 }
 673 
 674 /**
 675  * asd_query_task -- send a QUERY TASK TMF to an I_T_L_Q nexus
 676  * task: pointer to sas_task struct of interest
 677  *
 678  * Returns: TMF_RESP_FUNC_COMPLETE if the task is not in the task set,
 679  * or TMF_RESP_FUNC_SUCC if the task is in the task set.
 680  *
 681  * Normally the management layer sets the task to aborted state,
 682  * and then calls query task and then abort task.
 683  */
 684 int asd_query_task(struct sas_task *task)
 685 {
 686         struct asd_ascb *ascb = task->lldd_task;
 687         int index;
 688 
 689         if (ascb) {
 690                 index = ascb->tc_index;
 691                 return asd_initiate_ssp_tmf(task->dev, task->ssp_task.LUN,
 692                                             TMF_QUERY_TASK, index);
 693         }
 694         return TMF_RESP_FUNC_COMPLETE;
 695 }
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root/drivers/scsi/aic94xx/aic94xx_tmf.c

DEFINITIONS
