LXR linux/drivers/scsi/aic94xx/aic94xx

   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
  35static 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
  59struct 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
  75static 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
  90static 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; \
 130out_err:                        \
 131        asd_ascb_free(ascb);    \
 132        return res
 133
 134int 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
 143int 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
 153enum clear_nexus_phase {
 154        NEXUS_PHASE_PRE,
 155        NEXUS_PHASE_POST,
 156        NEXUS_PHASE_RESUME,
 157};
 158
 159static 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
 181int asd_I_T_nexus_reset(struct domain_device *dev)
 182{
 183        int res, tmp_res, i;
 184        struct sas_phy *phy = sas_find_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 == 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) {
 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                        return res;
 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        return TMF_RESP_FUNC_FAILED;
 215}
 216
 217static int asd_clear_nexus_I_T_L(struct domain_device *dev, u8 *lun)
 218{
 219        struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
 220
 221        CLEAR_NEXUS_PRE;
 222        scb->clear_nexus.nexus = NEXUS_I_T_L;
 223        scb->clear_nexus.flags = SEND_Q | EXEC_Q | NOTINQ;
 224        memcpy(scb->clear_nexus.ssp_task.lun, lun, 8);
 225        scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
 226                                                   dev->lldd_dev);
 227        CLEAR_NEXUS_POST;
 228}
 229
 230static int asd_clear_nexus_tag(struct sas_task *task)
 231{
 232        struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
 233        struct asd_ascb *tascb = task->lldd_task;
 234
 235        CLEAR_NEXUS_PRE;
 236        scb->clear_nexus.nexus = NEXUS_TAG;
 237        memcpy(scb->clear_nexus.ssp_task.lun, task->ssp_task.LUN, 8);
 238        scb->clear_nexus.ssp_task.tag = tascb->tag;
 239        if (task->dev->tproto)
 240                scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
 241                                                          task->dev->lldd_dev);
 242        CLEAR_NEXUS_POST;
 243}
 244
 245static int asd_clear_nexus_index(struct sas_task *task)
 246{
 247        struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
 248        struct asd_ascb *tascb = task->lldd_task;
 249
 250        CLEAR_NEXUS_PRE;
 251        scb->clear_nexus.nexus = NEXUS_TRANS_CX;
 252        if (task->dev->tproto)
 253                scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
 254                                                          task->dev->lldd_dev);
 255        scb->clear_nexus.index = cpu_to_le16(tascb->tc_index);
 256        CLEAR_NEXUS_POST;
 257}
 258
 259/* ---------- TMFs ---------- */
 260
 261static void asd_tmf_timedout(unsigned long data)
 262{
 263        struct asd_ascb *ascb = (void *) data;
 264        struct tasklet_completion_status *tcs = ascb->uldd_task;
 265
 266        ASD_DPRINTK("tmf timed out\n");
 267        tcs->tmf_state = TMF_RESP_FUNC_FAILED;
 268        complete(ascb->completion);
 269}
 270
 271static int asd_get_tmf_resp_tasklet(struct asd_ascb *ascb,
 272                                    struct done_list_struct *dl)
 273{
 274        struct asd_ha_struct *asd_ha = ascb->ha;
 275        unsigned long flags;
 276        struct tc_resp_sb_struct {
 277                __le16 index_escb;
 278                u8     len_lsb;
 279                u8     flags;
 280        } __attribute__ ((packed)) *resp_sb = (void *) dl->status_block;
 281
 282        int  edb_id = ((resp_sb->flags & 0x70) >> 4)-1;
 283        struct asd_ascb *escb;
 284        struct asd_dma_tok *edb;
 285        struct ssp_frame_hdr *fh;
 286        struct ssp_response_iu   *ru;
 287        int res = TMF_RESP_FUNC_FAILED;
 288
 289        ASD_DPRINTK("tmf resp tasklet\n");
 290
 291        spin_lock_irqsave(&asd_ha->seq.tc_index_lock, flags);
 292        escb = asd_tc_index_find(&asd_ha->seq,
 293                                 (int)le16_to_cpu(resp_sb->index_escb));
 294        spin_unlock_irqrestore(&asd_ha->seq.tc_index_lock, flags);
 295
 296        if (!escb) {
 297                ASD_DPRINTK("Uh-oh! No escb for this dl?!\n");
 298                return res;
 299        }
 300
 301        edb = asd_ha->seq.edb_arr[edb_id + escb->edb_index];
 302        ascb->tag = *(__be16 *)(edb->vaddr+4);
 303        fh = edb->vaddr + 16;
 304        ru = edb->vaddr + 16 + sizeof(*fh);
 305        res = ru->status;
 306        if (ru->datapres == 1)    /* Response data present */
 307                res = ru->resp_data[3];
 308#if 0
 309        ascb->tag = fh->tag;
 310#endif
 311        ascb->tag_valid = 1;
 312
 313        asd_invalidate_edb(escb, edb_id);
 314        return res;
 315}
 316
 317static void asd_tmf_tasklet_complete(struct asd_ascb *ascb,
 318                                     struct done_list_struct *dl)
 319{
 320        struct tasklet_completion_status *tcs;
 321
 322        if (!del_timer(&ascb->timer))
 323                return;
 324
 325        tcs = ascb->uldd_task;
 326        ASD_DPRINTK("tmf tasklet complete\n");
 327
 328        tcs->dl_opcode = dl->opcode;
 329
 330        if (dl->opcode == TC_SSP_RESP) {
 331                tcs->tmf_state = asd_get_tmf_resp_tasklet(ascb, dl);
 332                tcs->tag_valid = ascb->tag_valid;
 333                tcs->tag = ascb->tag;
 334        }
 335
 336        complete(ascb->completion);
 337        asd_ascb_free(ascb);
 338}
 339
 340static int asd_clear_nexus(struct sas_task *task)
 341{
 342        int res = TMF_RESP_FUNC_FAILED;
 343        int leftover;
 344        struct asd_ascb *tascb = task->lldd_task;
 345        DECLARE_COMPLETION_ONSTACK(completion);
 346        unsigned long flags;
 347
 348        tascb->completion = &completion;
 349
 350        ASD_DPRINTK("task not done, clearing nexus\n");
 351        if (tascb->tag_valid)
 352                res = asd_clear_nexus_tag(task);
 353        else
 354                res = asd_clear_nexus_index(task);
 355        leftover = wait_for_completion_timeout(&completion,
 356                                               AIC94XX_SCB_TIMEOUT);
 357        tascb->completion = NULL;
 358        ASD_DPRINTK("came back from clear nexus\n");
 359        spin_lock_irqsave(&task->task_state_lock, flags);
 360        if (leftover < 1)
 361                res = TMF_RESP_FUNC_FAILED;
 362        if (task->task_state_flags & SAS_TASK_STATE_DONE)
 363                res = TMF_RESP_FUNC_COMPLETE;
 364        spin_unlock_irqrestore(&task->task_state_lock, flags);
 365
 366        return res;
 367}
 368
 369/**
 370 * asd_abort_task -- ABORT TASK TMF
 371 * @task: the task to be aborted
 372 *
 373 * Before calling ABORT TASK the task state flags should be ORed with
 374 * SAS_TASK_STATE_ABORTED (unless SAS_TASK_STATE_DONE is set) under
 375 * the task_state_lock IRQ spinlock, then ABORT TASK *must* be called.
 376 *
 377 * Implements the ABORT TASK TMF, I_T_L_Q nexus.
 378 * Returns: SAS TMF responses (see sas_task.h),
 379 *          -ENOMEM,
 380 *          -SAS_QUEUE_FULL.
 381 *
 382 * When ABORT TASK returns, the caller of ABORT TASK checks first the
 383 * task->task_state_flags, and then the return value of ABORT TASK.
 384 *
 385 * If the task has task state bit SAS_TASK_STATE_DONE set, then the
 386 * task was completed successfully prior to it being aborted.  The
 387 * caller of ABORT TASK has responsibility to call task->task_done()
 388 * xor free the task, depending on their framework.  The return code
 389 * is TMF_RESP_FUNC_FAILED in this case.
 390 *
 391 * Else the SAS_TASK_STATE_DONE bit is not set,
 392 *      If the return code is TMF_RESP_FUNC_COMPLETE, then
 393 *              the task was aborted successfully.  The caller of
 394 *              ABORT TASK has responsibility to call task->task_done()
 395 *              to finish the task, xor free the task depending on their
 396 *              framework.
 397 *      else
 398 *              the ABORT TASK returned some kind of error. The task
 399 *              was _not_ cancelled.  Nothing can be assumed.
 400 *              The caller of ABORT TASK may wish to retry.
 401 */
 402int asd_abort_task(struct sas_task *task)
 403{
 404        struct asd_ascb *tascb = task->lldd_task;
 405        struct asd_ha_struct *asd_ha = tascb->ha;
 406        int res = 1;
 407        unsigned long flags;
 408        struct asd_ascb *ascb = NULL;
 409        struct scb *scb;
 410        int leftover;
 411        DECLARE_TCS(tcs);
 412        DECLARE_COMPLETION_ONSTACK(completion);
 413        DECLARE_COMPLETION_ONSTACK(tascb_completion);
 414
 415        tascb->completion = &tascb_completion;
 416
 417        spin_lock_irqsave(&task->task_state_lock, flags);
 418        if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 419                spin_unlock_irqrestore(&task->task_state_lock, flags);
 420                res = TMF_RESP_FUNC_COMPLETE;
 421                ASD_DPRINTK("%s: task 0x%p done\n", __func__, task);
 422                goto out_done;
 423        }
 424        spin_unlock_irqrestore(&task->task_state_lock, flags);
 425
 426        ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
 427        if (!ascb)
 428                return -ENOMEM;
 429
 430        ascb->uldd_task = &tcs;
 431        ascb->completion = &completion;
 432        scb = ascb->scb;
 433        scb->header.opcode = SCB_ABORT_TASK;
 434
 435        switch (task->task_proto) {
 436        case SAS_PROTOCOL_SATA:
 437        case SAS_PROTOCOL_STP:
 438                scb->abort_task.proto_conn_rate = (1 << 5); /* STP */
 439                break;
 440        case SAS_PROTOCOL_SSP:
 441                scb->abort_task.proto_conn_rate  = (1 << 4); /* SSP */
 442                scb->abort_task.proto_conn_rate |= task->dev->linkrate;
 443                break;
 444        case SAS_PROTOCOL_SMP:
 445                break;
 446        default:
 447                break;
 448        }
 449
 450        if (task->task_proto == SAS_PROTOCOL_SSP) {
 451                scb->abort_task.ssp_frame.frame_type = SSP_TASK;
 452                memcpy(scb->abort_task.ssp_frame.hashed_dest_addr,
 453                       task->dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
 454                memcpy(scb->abort_task.ssp_frame.hashed_src_addr,
 455                       task->dev->port->ha->hashed_sas_addr,
 456                       HASHED_SAS_ADDR_SIZE);
 457                scb->abort_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);
 458
 459                memcpy(scb->abort_task.ssp_task.lun, task->ssp_task.LUN, 8);
 460                scb->abort_task.ssp_task.tmf = TMF_ABORT_TASK;
 461                scb->abort_task.ssp_task.tag = cpu_to_be16(0xFFFF);
 462        }
 463
 464        scb->abort_task.sister_scb = cpu_to_le16(0xFFFF);
 465        scb->abort_task.conn_handle = cpu_to_le16(
 466                (u16)(unsigned long)task->dev->lldd_dev);
 467        scb->abort_task.retry_count = 1;
 468        scb->abort_task.index = cpu_to_le16((u16)tascb->tc_index);
 469        scb->abort_task.itnl_to = cpu_to_le16(ITNL_TIMEOUT_CONST);
 470
 471        res = asd_enqueue_internal(ascb, asd_tmf_tasklet_complete,
 472                                   asd_tmf_timedout);
 473        if (res)
 474                goto out_free;
 475        wait_for_completion(&completion);
 476        ASD_DPRINTK("tmf came back\n");
 477
 478        tascb->tag = tcs.tag;
 479        tascb->tag_valid = tcs.tag_valid;
 480
 481        spin_lock_irqsave(&task->task_state_lock, flags);
 482        if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 483                spin_unlock_irqrestore(&task->task_state_lock, flags);
 484                res = TMF_RESP_FUNC_COMPLETE;
 485                ASD_DPRINTK("%s: task 0x%p done\n", __func__, task);
 486                goto out_done;
 487        }
 488        spin_unlock_irqrestore(&task->task_state_lock, flags);
 489
 490        if (tcs.dl_opcode == TC_SSP_RESP) {
 491                /* The task to be aborted has been sent to the device.
 492                 * We got a Response IU for the ABORT TASK TMF. */
 493                if (tcs.tmf_state == TMF_RESP_FUNC_COMPLETE)
 494                        res = asd_clear_nexus(task);
 495                else
 496                        res = tcs.tmf_state;
 497        } else if (tcs.dl_opcode == TC_NO_ERROR &&
 498                   tcs.tmf_state == TMF_RESP_FUNC_FAILED) {
 499                /* timeout */
 500                res = TMF_RESP_FUNC_FAILED;
 501        } else {
 502                /* In the following we assume that the managing layer
 503                 * will _never_ make a mistake, when issuing ABORT
 504                 * TASK.
 505                 */
 506                switch (tcs.dl_opcode) {
 507                default:
 508                        res = asd_clear_nexus(task);
 509                        /* fallthrough */
 510                case TC_NO_ERROR:
 511                        break;
 512                        /* The task hasn't been sent to the device xor
 513                         * we never got a (sane) Response IU for the
 514                         * ABORT TASK TMF.
 515                         */
 516                case TF_NAK_RECV:
 517                        res = TMF_RESP_INVALID_FRAME;
 518                        break;
 519                case TF_TMF_TASK_DONE:  /* done but not reported yet */
 520                        res = TMF_RESP_FUNC_FAILED;
 521                        leftover =
 522                                wait_for_completion_timeout(&tascb_completion,
 523                                                          AIC94XX_SCB_TIMEOUT);
 524                        spin_lock_irqsave(&task->task_state_lock, flags);
 525                        if (leftover < 1)
 526                                res = TMF_RESP_FUNC_FAILED;
 527                        if (task->task_state_flags & SAS_TASK_STATE_DONE)
 528                                res = TMF_RESP_FUNC_COMPLETE;
 529                        spin_unlock_irqrestore(&task->task_state_lock, flags);
 530                        break;
 531                case TF_TMF_NO_TAG:
 532                case TF_TMF_TAG_FREE: /* the tag is in the free list */
 533                case TF_TMF_NO_CONN_HANDLE: /* no such device */
 534                        res = TMF_RESP_FUNC_COMPLETE;
 535                        break;
 536                case TF_TMF_NO_CTX: /* not in seq, or proto != SSP */
 537                        res = TMF_RESP_FUNC_ESUPP;
 538                        break;
 539                }
 540        }
 541 out_done:
 542        tascb->completion = NULL;
 543        if (res == TMF_RESP_FUNC_COMPLETE) {
 544                task->lldd_task = NULL;
 545                mb();
 546                asd_ascb_free(tascb);
 547        }
 548        ASD_DPRINTK("task 0x%p aborted, res: 0x%x\n", task, res);
 549        return res;
 550
 551 out_free:
 552        asd_ascb_free(ascb);
 553        ASD_DPRINTK("task 0x%p aborted, res: 0x%x\n", task, res);
 554        return res;
 555}
 556
 557/**
 558 * asd_initiate_ssp_tmf -- send a TMF to an I_T_L or I_T_L_Q nexus
 559 * @dev: pointer to struct domain_device of interest
 560 * @lun: pointer to u8[8] which is the LUN
 561 * @tmf: the TMF to be performed (see sas_task.h or the SAS spec)
 562 * @index: the transaction context of the task to be queried if QT TMF
 563 *
 564 * This function is used to send ABORT TASK SET, CLEAR ACA,
 565 * CLEAR TASK SET, LU RESET and QUERY TASK TMFs.
 566 *
 567 * No SCBs should be queued to the I_T_L nexus when this SCB is
 568 * pending.
 569 *
 570 * Returns: TMF response code (see sas_task.h or the SAS spec)
 571 */
 572static int asd_initiate_ssp_tmf(struct domain_device *dev, u8 *lun,
 573                                int tmf, int index)
 574{
 575        struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
 576        struct asd_ascb *ascb;
 577        int res = 1;
 578        struct scb *scb;
 579        DECLARE_COMPLETION_ONSTACK(completion);
 580        DECLARE_TCS(tcs);
 581
 582        if (!(dev->tproto & SAS_PROTOCOL_SSP))
 583                return TMF_RESP_FUNC_ESUPP;
 584
 585        ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
 586        if (!ascb)
 587                return -ENOMEM;
 588
 589        ascb->completion = &completion;
 590        ascb->uldd_task = &tcs;
 591        scb = ascb->scb;
 592
 593        if (tmf == TMF_QUERY_TASK)
 594                scb->header.opcode = QUERY_SSP_TASK;
 595        else
 596                scb->header.opcode = INITIATE_SSP_TMF;
 597
 598        scb->ssp_tmf.proto_conn_rate  = (1 << 4); /* SSP */
 599        scb->ssp_tmf.proto_conn_rate |= dev->linkrate;
 600        /* SSP frame header */
 601        scb->ssp_tmf.ssp_frame.frame_type = SSP_TASK;
 602        memcpy(scb->ssp_tmf.ssp_frame.hashed_dest_addr,
 603               dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
 604        memcpy(scb->ssp_tmf.ssp_frame.hashed_src_addr,
 605               dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
 606        scb->ssp_tmf.ssp_frame.tptt = cpu_to_be16(0xFFFF);
 607        /* SSP Task IU */
 608        memcpy(scb->ssp_tmf.ssp_task.lun, lun, 8);
 609        scb->ssp_tmf.ssp_task.tmf = tmf;
 610
 611        scb->ssp_tmf.sister_scb = cpu_to_le16(0xFFFF);
 612        scb->ssp_tmf.conn_handle= cpu_to_le16((u16)(unsigned long)
 613                                              dev->lldd_dev);
 614        scb->ssp_tmf.retry_count = 1;
 615        scb->ssp_tmf.itnl_to = cpu_to_le16(ITNL_TIMEOUT_CONST);
 616        if (tmf == TMF_QUERY_TASK)
 617                scb->ssp_tmf.index = cpu_to_le16(index);
 618
 619        res = asd_enqueue_internal(ascb, asd_tmf_tasklet_complete,
 620                                   asd_tmf_timedout);
 621        if (res)
 622                goto out_err;
 623        wait_for_completion(&completion);
 624
 625        switch (tcs.dl_opcode) {
 626        case TC_NO_ERROR:
 627                res = TMF_RESP_FUNC_COMPLETE;
 628                break;
 629        case TF_NAK_RECV:
 630                res = TMF_RESP_INVALID_FRAME;
 631                break;
 632        case TF_TMF_TASK_DONE:
 633                res = TMF_RESP_FUNC_FAILED;
 634                break;
 635        case TF_TMF_NO_TAG:
 636        case TF_TMF_TAG_FREE: /* the tag is in the free list */
 637        case TF_TMF_NO_CONN_HANDLE: /* no such device */
 638                res = TMF_RESP_FUNC_COMPLETE;
 639                break;
 640        case TF_TMF_NO_CTX: /* not in seq, or proto != SSP */
 641                res = TMF_RESP_FUNC_ESUPP;
 642                break;
 643        default:
 644                /* Allow TMF response codes to propagate upwards */
 645                res = tcs.dl_opcode;
 646                break;
 647        }
 648        return res;
 649out_err:
 650        asd_ascb_free(ascb);
 651        return res;
 652}
 653
 654int asd_abort_task_set(struct domain_device *dev, u8 *lun)
 655{
 656        int res = asd_initiate_ssp_tmf(dev, lun, TMF_ABORT_TASK_SET, 0);
 657
 658        if (res == TMF_RESP_FUNC_COMPLETE)
 659                asd_clear_nexus_I_T_L(dev, lun);
 660        return res;
 661}
 662
 663int asd_clear_aca(struct domain_device *dev, u8 *lun)
 664{
 665        int res = asd_initiate_ssp_tmf(dev, lun, TMF_CLEAR_ACA, 0);
 666
 667        if (res == TMF_RESP_FUNC_COMPLETE)
 668                asd_clear_nexus_I_T_L(dev, lun);
 669        return res;
 670}
 671
 672int asd_clear_task_set(struct domain_device *dev, u8 *lun)
 673{
 674        int res = asd_initiate_ssp_tmf(dev, lun, TMF_CLEAR_TASK_SET, 0);
 675
 676        if (res == TMF_RESP_FUNC_COMPLETE)
 677                asd_clear_nexus_I_T_L(dev, lun);
 678        return res;
 679}
 680
 681int asd_lu_reset(struct domain_device *dev, u8 *lun)
 682{
 683        int res = asd_initiate_ssp_tmf(dev, lun, TMF_LU_RESET, 0);
 684
 685        if (res == TMF_RESP_FUNC_COMPLETE)
 686                asd_clear_nexus_I_T_L(dev, lun);
 687        return res;
 688}
 689
 690/**
 691 * asd_query_task -- send a QUERY TASK TMF to an I_T_L_Q nexus
 692 * task: pointer to sas_task struct of interest
 693 *
 694 * Returns: TMF_RESP_FUNC_COMPLETE if the task is not in the task set,
 695 * or TMF_RESP_FUNC_SUCC if the task is in the task set.
 696 *
 697 * Normally the management layer sets the task to aborted state,
 698 * and then calls query task and then abort task.
 699 */
 700int asd_query_task(struct sas_task *task)
 701{
 702        struct asd_ascb *ascb = task->lldd_task;
 703        int index;
 704
 705        if (ascb) {
 706                index = ascb->tc_index;
 707                return asd_initiate_ssp_tmf(task->dev, task->ssp_task.LUN,
 708                                            TMF_QUERY_TASK, index);
 709        }
 710        return TMF_RESP_FUNC_COMPLETE;
 711}
 712