kernel/drivers/net/ethernet/cavium/liquidio/request_manager.c

   1 /**********************************************************************
   2  * Author: Cavium, Inc.
   3  *
   4  * Contact: support@cavium.com
   5  *          Please include "LiquidIO" in the subject.
   6  *
   7  * Copyright (c) 2003-2015 Cavium, Inc.
   8  *
   9  * This file is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, Version 2, as
  11  * published by the Free Software Foundation.
  12  *
  13  * This file is distributed in the hope that it will be useful, but
  14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16  * NONINFRINGEMENT.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * This file may also be available under a different license from Cavium.
  20  * Contact Cavium, Inc. for more information
  21  **********************************************************************/
  22 #include <linux/version.h>
  23 #include <linux/types.h>
  24 #include <linux/list.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/pci.h>
  27 #include <linux/kthread.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/vmalloc.h>
  30 #include "octeon_config.h"
  31 #include "liquidio_common.h"
  32 #include "octeon_droq.h"
  33 #include "octeon_iq.h"
  34 #include "response_manager.h"
  35 #include "octeon_device.h"
  36 #include "octeon_nic.h"
  37 #include "octeon_main.h"
  38 #include "octeon_network.h"
  39 #include "cn66xx_regs.h"
  40 #include "cn66xx_device.h"
  41 #include "cn68xx_regs.h"
  42 #include "cn68xx_device.h"
  43 #include "liquidio_image.h"
  44
  45 #define INCR_INSTRQUEUE_PKT_COUNT(octeon_dev_ptr, iq_no, field, count)  \
  46         (octeon_dev_ptr->instr_queue[iq_no]->stats.field += count)
  47
  48 struct iq_post_status {
  49         int status;
  50         int index;
  51 };
  52
  53 static void check_db_timeout(struct work_struct *work);
  54 static void  __check_db_timeout(struct octeon_device *oct, unsigned long iq_no);
  55
  56 static void (*reqtype_free_fn[MAX_OCTEON_DEVICES][REQTYPE_LAST + 1]) (void *);
  57
  58 static inline int IQ_INSTR_MODE_64B(struct octeon_device *oct, int iq_no)
  59 {
  60         struct octeon_instr_queue *iq =
  61             (struct octeon_instr_queue *)oct->instr_queue[iq_no];
  62         return iq->iqcmd_64B;
  63 }
  64
  65 #define IQ_INSTR_MODE_32B(oct, iq_no)  (!IQ_INSTR_MODE_64B(oct, iq_no))
  66
  67 /* Define this to return the request status comaptible to old code */
  68 /*#define OCTEON_USE_OLD_REQ_STATUS*/
  69
  70 /* Return 0 on success, 1 on failure */
  71 int octeon_init_instr_queue(struct octeon_device *oct,
  72                             u32 iq_no, u32 num_descs)
  73 {
  74         struct octeon_instr_queue *iq;
  75         struct octeon_iq_config *conf = NULL;
  76         u32 q_size;
  77         struct cavium_wq *db_wq;
  78
  79         if (OCTEON_CN6XXX(oct))
  80                 conf = &(CFG_GET_IQ_CFG(CHIP_FIELD(oct, cn6xxx, conf)));
  81
  82         if (!conf) {
  83                 dev_err(&oct->pci_dev->dev, "Unsupported Chip %x\n",
  84                         oct->chip_id);
  85                 return 1;
  86         }
  87
  88         if (num_descs & (num_descs - 1)) {
  89                 dev_err(&oct->pci_dev->dev,
  90                         "Number of descriptors for instr queue %d not in power of 2.\n",
  91                         iq_no);
  92                 return 1;
  93         }
  94
  95         q_size = (u32)conf->instr_type * num_descs;
  96
  97         iq = oct->instr_queue[iq_no];
  98
  99         iq->base_addr = lio_dma_alloc(oct, q_size,
 100                                       (dma_addr_t *)&iq->base_addr_dma);
 101         if (!iq->base_addr) {
 102                 dev_err(&oct->pci_dev->dev, "Cannot allocate memory for instr queue %d\n",
 103                         iq_no);
 104                 return 1;
 105         }
 106
 107         iq->max_count = num_descs;
 108
 109         /* Initialize a list to holds requests that have been posted to Octeon
 110          * but has yet to be fetched by octeon
 111          */
 112         iq->request_list = vmalloc(sizeof(*iq->request_list) * num_descs);
 113         if (!iq->request_list) {
 114                 lio_dma_free(oct, q_size, iq->base_addr, iq->base_addr_dma);
 115                 dev_err(&oct->pci_dev->dev, "Alloc failed for IQ[%d] nr free list\n",
 116                         iq_no);
 117                 return 1;
 118         }
 119
 120         memset(iq->request_list, 0, sizeof(*iq->request_list) * num_descs);
 121
 122         dev_dbg(&oct->pci_dev->dev, "IQ[%d]: base: %p basedma: %llx count: %d\n",
 123                 iq_no, iq->base_addr, iq->base_addr_dma, iq->max_count);
 124
 125         iq->iq_no = iq_no;
 126         iq->fill_threshold = (u32)conf->db_min;
 127         iq->fill_cnt = 0;
 128         iq->host_write_index = 0;
 129         iq->octeon_read_index = 0;
 130         iq->flush_index = 0;
 131         iq->last_db_time = 0;
 132         iq->do_auto_flush = 1;
 133         iq->db_timeout = (u32)conf->db_timeout;
 134         atomic_set(&iq->instr_pending, 0);
 135
 136         /* Initialize the spinlock for this instruction queue */
 137         spin_lock_init(&iq->lock);
 138
 139         oct->io_qmask.iq |= (1 << iq_no);
 140
 141         /* Set the 32B/64B mode for each input queue */
 142         oct->io_qmask.iq64B |= ((conf->instr_type == 64) << iq_no);
 143         iq->iqcmd_64B = (conf->instr_type == 64);
 144
 145         oct->fn_list.setup_iq_regs(oct, iq_no);
 146
 147         oct->check_db_wq[iq_no].wq = create_workqueue("check_iq_db");
 148         if (!oct->check_db_wq[iq_no].wq) {
 149                 lio_dma_free(oct, q_size, iq->base_addr, iq->base_addr_dma);
 150                 dev_err(&oct->pci_dev->dev, "check db wq create failed for iq %d\n",
 151                         iq_no);
 152                 return 1;
 153         }
 154
 155         db_wq = &oct->check_db_wq[iq_no];
 156
 157         INIT_DELAYED_WORK(&db_wq->wk.work, check_db_timeout);
 158         db_wq->wk.ctxptr = oct;
 159         db_wq->wk.ctxul = iq_no;
 160         queue_delayed_work(db_wq->wq, &db_wq->wk.work, msecs_to_jiffies(1));
 161
 162         return 0;
 163 }
 164
 165 int octeon_delete_instr_queue(struct octeon_device *oct, u32 iq_no)
 166 {
 167         u64 desc_size = 0, q_size;
 168         struct octeon_instr_queue *iq = oct->instr_queue[iq_no];
 169
 170         cancel_delayed_work_sync(&oct->check_db_wq[iq_no].wk.work);
 171         flush_workqueue(oct->check_db_wq[iq_no].wq);
 172         destroy_workqueue(oct->check_db_wq[iq_no].wq);
 173
 174         if (OCTEON_CN6XXX(oct))
 175                 desc_size =
 176                     CFG_GET_IQ_INSTR_TYPE(CHIP_FIELD(oct, cn6xxx, conf));
 177
 178         vfree(iq->request_list);
 179
 180         if (iq->base_addr) {
 181                 q_size = iq->max_count * desc_size;
 182                 lio_dma_free(oct, (u32)q_size, iq->base_addr,
 183                              iq->base_addr_dma);
 184                 return 0;
 185         }
 186         return 1;
 187 }
 188
 189 /* Return 0 on success, 1 on failure */
 190 int octeon_setup_iq(struct octeon_device *oct,
 191                     u32 iq_no,
 192                     u32 num_descs,
 193                     void *app_ctx)
 194 {
 195         if (oct->instr_queue[iq_no]) {
 196                 dev_dbg(&oct->pci_dev->dev, "IQ is in use. Cannot create the IQ: %d again\n",
 197                         iq_no);
 198                 oct->instr_queue[iq_no]->app_ctx = app_ctx;
 199                 return 0;
 200         }
 201         oct->instr_queue[iq_no] =
 202             vmalloc(sizeof(struct octeon_instr_queue));
 203         if (!oct->instr_queue[iq_no])
 204                 return 1;
 205
 206         memset(oct->instr_queue[iq_no], 0,
 207                sizeof(struct octeon_instr_queue));
 208
 209         oct->instr_queue[iq_no]->app_ctx = app_ctx;
 210         if (octeon_init_instr_queue(oct, iq_no, num_descs)) {
 211                 vfree(oct->instr_queue[iq_no]);
 212                 oct->instr_queue[iq_no] = NULL;
 213                 return 1;
 214         }
 215
 216         oct->num_iqs++;
 217         oct->fn_list.enable_io_queues(oct);
 218         return 0;
 219 }
 220
 221 int lio_wait_for_instr_fetch(struct octeon_device *oct)
 222 {
 223         int i, retry = 1000, pending, instr_cnt = 0;
 224
 225         do {
 226                 instr_cnt = 0;
 227
 228                 /*for (i = 0; i < oct->num_iqs; i++) {*/
 229                 for (i = 0; i < MAX_OCTEON_INSTR_QUEUES; i++) {
 230                         if (!(oct->io_qmask.iq & (1UL << i)))
 231                                 continue;
 232                         pending =
 233                             atomic_read(&oct->
 234                                                instr_queue[i]->instr_pending);
 235                         if (pending)
 236                                 __check_db_timeout(oct, i);
 237                         instr_cnt += pending;
 238                 }
 239
 240                 if (instr_cnt == 0)
 241                         break;
 242
 243                 schedule_timeout_uninterruptible(1);
 244
 245         } while (retry-- && instr_cnt);
 246
 247         return instr_cnt;
 248 }
 249
 250 static inline void
 251 ring_doorbell(struct octeon_device *oct, struct octeon_instr_queue *iq)
 252 {
 253         if (atomic_read(&oct->status) == OCT_DEV_RUNNING) {
 254                 writel(iq->fill_cnt, iq->doorbell_reg);
 255                 /* make sure doorbell write goes through */
 256                 mmiowb();
 257                 iq->fill_cnt = 0;
 258                 iq->last_db_time = jiffies;
 259                 return;
 260         }
 261 }
 262
 263 static inline void __copy_cmd_into_iq(struct octeon_instr_queue *iq,
 264                                       u8 *cmd)
 265 {
 266         u8 *iqptr, cmdsize;
 267
 268         cmdsize = ((iq->iqcmd_64B) ? 64 : 32);
 269         iqptr = iq->base_addr + (cmdsize * iq->host_write_index);
 270
 271         memcpy(iqptr, cmd, cmdsize);
 272 }
 273
 274 static inline int
 275 __post_command(struct octeon_device *octeon_dev __attribute__((unused)),
 276                struct octeon_instr_queue *iq,
 277                u32 force_db __attribute__((unused)), u8 *cmd)
 278 {
 279         u32 index = -1;
 280
 281         /* This ensures that the read index does not wrap around to the same
 282          * position if queue gets full before Octeon could fetch any instr.
 283          */
 284         if (atomic_read(&iq->instr_pending) >= (s32)(iq->max_count - 1))
 285                 return -1;
 286
 287         __copy_cmd_into_iq(iq, cmd);
 288
 289         /* "index" is returned, host_write_index is modified. */
 290         index = iq->host_write_index;
 291         INCR_INDEX_BY1(iq->host_write_index, iq->max_count);
 292         iq->fill_cnt++;
 293
 294         /* Flush the command into memory. We need to be sure the data is in
 295          * memory before indicating that the instruction is pending.
 296          */
 297         wmb();
 298
 299         atomic_inc(&iq->instr_pending);
 300
 301         return index;
 302 }
 303
 304 static inline struct iq_post_status
 305 __post_command2(struct octeon_device *octeon_dev __attribute__((unused)),
 306                 struct octeon_instr_queue *iq,
 307                 u32 force_db __attribute__((unused)), u8 *cmd)
 308 {
 309         struct iq_post_status st;
 310
 311         st.status = IQ_SEND_OK;
 312
 313         /* This ensures that the read index does not wrap around to the same
 314          * position if queue gets full before Octeon could fetch any instr.
 315          */
 316         if (atomic_read(&iq->instr_pending) >= (s32)(iq->max_count - 1)) {
 317                 st.status = IQ_SEND_FAILED;
 318                 st.index = -1;
 319                 return st;
 320         }
 321
 322         if (atomic_read(&iq->instr_pending) >= (s32)(iq->max_count - 2))
 323                 st.status = IQ_SEND_STOP;
 324
 325         __copy_cmd_into_iq(iq, cmd);
 326
 327         /* "index" is returned, host_write_index is modified. */
 328         st.index = iq->host_write_index;
 329         INCR_INDEX_BY1(iq->host_write_index, iq->max_count);
 330         iq->fill_cnt++;
 331
 332         /* Flush the command into memory. We need to be sure the data is in
 333          * memory before indicating that the instruction is pending.
 334          */
 335         wmb();
 336
 337         atomic_inc(&iq->instr_pending);
 338
 339         return st;
 340 }
 341
 342 int
 343 octeon_register_reqtype_free_fn(struct octeon_device *oct, int reqtype,
 344                                 void (*fn)(void *))
 345 {
 346         if (reqtype > REQTYPE_LAST) {
 347                 dev_err(&oct->pci_dev->dev, "%s: Invalid reqtype: %d\n",
 348                         __func__, reqtype);
 349                 return -EINVAL;
 350         }
 351
 352         reqtype_free_fn[oct->octeon_id][reqtype] = fn;
 353
 354         return 0;
 355 }
 356
 357 static inline void
 358 __add_to_request_list(struct octeon_instr_queue *iq,
 359                       int idx, void *buf, int reqtype)
 360 {
 361         iq->request_list[idx].buf = buf;
 362         iq->request_list[idx].reqtype = reqtype;
 363 }
 364
 365 int
 366 lio_process_iq_request_list(struct octeon_device *oct,
 367                             struct octeon_instr_queue *iq)
 368 {
 369         int reqtype;
 370         void *buf;
 371         u32 old = iq->flush_index;
 372         u32 inst_count = 0;
 373         unsigned pkts_compl = 0, bytes_compl = 0;
 374         struct octeon_soft_command *sc;
 375         struct octeon_instr_irh *irh;
 376
 377         while (old != iq->octeon_read_index) {
 378                 reqtype = iq->request_list[old].reqtype;
 379                 buf     = iq->request_list[old].buf;
 380
 381                 if (reqtype == REQTYPE_NONE)
 382                         goto skip_this;
 383
 384                 octeon_update_tx_completion_counters(buf, reqtype, &pkts_compl,
 385                                                      &bytes_compl);
 386
 387                 switch (reqtype) {
 388                 case REQTYPE_NORESP_NET:
 389                 case REQTYPE_NORESP_NET_SG:
 390                 case REQTYPE_RESP_NET_SG:
 391                         reqtype_free_fn[oct->octeon_id][reqtype](buf);
 392                         break;
 393                 case REQTYPE_RESP_NET:
 394                 case REQTYPE_SOFT_COMMAND:
 395                         sc = buf;
 396
 397                         irh = (struct octeon_instr_irh *)&sc->cmd.irh;
 398                         if (irh->rflag) {
 399                                 /* We're expecting a response from Octeon.
 400                                  * It's up to lio_process_ordered_list() to
 401                                  * process  sc. Add sc to the ordered soft
 402                                  * command response list because we expect
 403                                  * a response from Octeon.
 404                                  */
 405                                 spin_lock_bh(&oct->response_list
 406                                         [OCTEON_ORDERED_SC_LIST].lock);
 407                                 atomic_inc(&oct->response_list
 408                                         [OCTEON_ORDERED_SC_LIST].
 409                                         pending_req_count);
 410                                 list_add_tail(&sc->node, &oct->response_list
 411                                         [OCTEON_ORDERED_SC_LIST].head);
 412                                 spin_unlock_bh(&oct->response_list
 413                                         [OCTEON_ORDERED_SC_LIST].lock);
 414                         } else {
 415                                 if (sc->callback) {
 416                                         sc->callback(oct, OCTEON_REQUEST_DONE,
 417                                                      sc->callback_arg);
 418                                 }
 419                         }
 420                         break;
 421                 default:
 422                         dev_err(&oct->pci_dev->dev,
 423                                 "%s Unknown reqtype: %d buf: %p at idx %d\n",
 424                                 __func__, reqtype, buf, old);
 425                 }
 426
 427                 iq->request_list[old].buf = NULL;
 428                 iq->request_list[old].reqtype = 0;
 429
 430  skip_this:
 431                 inst_count++;
 432                 INCR_INDEX_BY1(old, iq->max_count);
 433         }
 434         if (bytes_compl)
 435                 octeon_report_tx_completion_to_bql(iq->app_ctx, pkts_compl,
 436                                                    bytes_compl);
 437         iq->flush_index = old;
 438
 439         return inst_count;
 440 }
 441
 442 static inline void
 443 update_iq_indices(struct octeon_device *oct, struct octeon_instr_queue *iq)
 444 {
 445         u32 inst_processed = 0;
 446
 447         /* Calculate how many commands Octeon has read and move the read index
 448          * accordingly.
 449          */
 450         iq->octeon_read_index = oct->fn_list.update_iq_read_idx(oct, iq);
 451
 452         /* Move the NORESPONSE requests to the per-device completion list. */
 453         if (iq->flush_index != iq->octeon_read_index)
 454                 inst_processed = lio_process_iq_request_list(oct, iq);
 455
 456         if (inst_processed) {
 457                 atomic_sub(inst_processed, &iq->instr_pending);
 458                 iq->stats.instr_processed += inst_processed;
 459         }
 460 }
 461
 462 static void
 463 octeon_flush_iq(struct octeon_device *oct, struct octeon_instr_queue *iq,
 464                 u32 pending_thresh)
 465 {
 466         if (atomic_read(&iq->instr_pending) >= (s32)pending_thresh) {
 467                 spin_lock_bh(&iq->lock);
 468                 update_iq_indices(oct, iq);
 469                 spin_unlock_bh(&iq->lock);
 470         }
 471 }
 472
 473 static void __check_db_timeout(struct octeon_device *oct, unsigned long iq_no)
 474 {
 475         struct octeon_instr_queue *iq;
 476         u64 next_time;
 477
 478         if (!oct)
 479                 return;
 480         iq = oct->instr_queue[iq_no];
 481         if (!iq)
 482                 return;
 483
 484         /* If jiffies - last_db_time < db_timeout do nothing  */
 485         next_time = iq->last_db_time + iq->db_timeout;
 486         if (!time_after(jiffies, (unsigned long)next_time))
 487                 return;
 488         iq->last_db_time = jiffies;
 489
 490         /* Get the lock and prevent tasklets. This routine gets called from
 491          * the poll thread. Instructions can now be posted in tasklet context
 492          */
 493         spin_lock_bh(&iq->lock);
 494         if (iq->fill_cnt != 0)
 495                 ring_doorbell(oct, iq);
 496
 497         spin_unlock_bh(&iq->lock);
 498
 499         /* Flush the instruction queue */
 500         if (iq->do_auto_flush)
 501                 octeon_flush_iq(oct, iq, 1);
 502 }
 503
 504 /* Called by the Poll thread at regular intervals to check the instruction
 505  * queue for commands to be posted and for commands that were fetched by Octeon.
 506  */
 507 static void check_db_timeout(struct work_struct *work)
 508 {
 509         struct cavium_wk *wk = (struct cavium_wk *)work;
 510         struct octeon_device *oct = (struct octeon_device *)wk->ctxptr;
 511         unsigned long iq_no = wk->ctxul;
 512         struct cavium_wq *db_wq = &oct->check_db_wq[iq_no];
 513
 514         __check_db_timeout(oct, iq_no);
 515         queue_delayed_work(db_wq->wq, &db_wq->wk.work, msecs_to_jiffies(1));
 516 }
 517
 518 int
 519 octeon_send_command(struct octeon_device *oct, u32 iq_no,
 520                     u32 force_db, void *cmd, void *buf,
 521                     u32 datasize, u32 reqtype)
 522 {
 523         struct iq_post_status st;
 524         struct octeon_instr_queue *iq = oct->instr_queue[iq_no];
 525
 526         spin_lock_bh(&iq->lock);
 527
 528         st = __post_command2(oct, iq, force_db, cmd);
 529
 530         if (st.status != IQ_SEND_FAILED) {
 531                 octeon_report_sent_bytes_to_bql(buf, reqtype);
 532                 __add_to_request_list(iq, st.index, buf, reqtype);
 533                 INCR_INSTRQUEUE_PKT_COUNT(oct, iq_no, bytes_sent, datasize);
 534                 INCR_INSTRQUEUE_PKT_COUNT(oct, iq_no, instr_posted, 1);
 535
 536                 if (iq->fill_cnt >= iq->fill_threshold || force_db)
 537                         ring_doorbell(oct, iq);
 538         } else {
 539                 INCR_INSTRQUEUE_PKT_COUNT(oct, iq_no, instr_dropped, 1);
 540         }
 541
 542         spin_unlock_bh(&iq->lock);
 543
 544         if (iq->do_auto_flush)
 545                 octeon_flush_iq(oct, iq, 2);
 546
 547         return st.status;
 548 }
 549
 550 void
 551 octeon_prepare_soft_command(struct octeon_device *oct,
 552                             struct octeon_soft_command *sc,
 553                             u8 opcode,
 554                             u8 subcode,
 555                             u32 irh_ossp,
 556                             u64 ossp0,
 557                             u64 ossp1)
 558 {
 559         struct octeon_config *oct_cfg;
 560         struct octeon_instr_ih *ih;
 561         struct octeon_instr_irh *irh;
 562         struct octeon_instr_rdp *rdp;
 563
 564         BUG_ON(opcode > 15);
 565         BUG_ON(subcode > 127);
 566
 567         oct_cfg = octeon_get_conf(oct);
 568
 569         ih          = (struct octeon_instr_ih *)&sc->cmd.ih;
 570         ih->tagtype = ATOMIC_TAG;
 571         ih->tag     = LIO_CONTROL;
 572         ih->raw     = 1;
 573         ih->grp     = CFG_GET_CTRL_Q_GRP(oct_cfg);
 574
 575         if (sc->datasize) {
 576                 ih->dlengsz = sc->datasize;
 577                 ih->rs = 1;
 578         }
 579
 580         irh            = (struct octeon_instr_irh *)&sc->cmd.irh;
 581         irh->opcode    = opcode;
 582         irh->subcode   = subcode;
 583
 584         /* opcode/subcode specific parameters (ossp) */
 585         irh->ossp       = irh_ossp;
 586         sc->cmd.ossp[0] = ossp0;
 587         sc->cmd.ossp[1] = ossp1;
 588
 589         if (sc->rdatasize) {
 590                 rdp            = (struct octeon_instr_rdp *)&sc->cmd.rdp;
 591                 rdp->pcie_port = oct->pcie_port;
 592                 rdp->rlen      = sc->rdatasize;
 593
 594                 irh->rflag =  1;
 595                 irh->len   =  4;
 596                 ih->fsz    = 40; /* irh+ossp[0]+ossp[1]+rdp+rptr = 40 bytes */
 597         } else {
 598                 irh->rflag =  0;
 599                 irh->len   =  2;
 600                 ih->fsz    = 24; /* irh + ossp[0] + ossp[1] = 24 bytes */
 601         }
 602
 603         while (!(oct->io_qmask.iq & (1 << sc->iq_no)))
 604                 sc->iq_no++;
 605 }
 606
 607 int octeon_send_soft_command(struct octeon_device *oct,
 608                              struct octeon_soft_command *sc)
 609 {
 610         struct octeon_instr_ih *ih;
 611         struct octeon_instr_irh *irh;
 612         struct octeon_instr_rdp *rdp;
 613
 614         ih = (struct octeon_instr_ih *)&sc->cmd.ih;
 615         if (ih->dlengsz) {
 616                 BUG_ON(!sc->dmadptr);
 617                 sc->cmd.dptr = sc->dmadptr;
 618         }
 619
 620         irh = (struct octeon_instr_irh *)&sc->cmd.irh;
 621         if (irh->rflag) {
 622                 BUG_ON(!sc->dmarptr);
 623                 BUG_ON(!sc->status_word);
 624                 *sc->status_word = COMPLETION_WORD_INIT;
 625
 626                 rdp = (struct octeon_instr_rdp *)&sc->cmd.rdp;
 627
 628                 sc->cmd.rptr = sc->dmarptr;
 629         }
 630
 631         if (sc->wait_time)
 632                 sc->timeout = jiffies + sc->wait_time;
 633
 634         return octeon_send_command(oct, sc->iq_no, 1, &sc->cmd, sc,
 635                                    (u32)ih->dlengsz, REQTYPE_SOFT_COMMAND);
 636 }
 637
 638 int octeon_setup_sc_buffer_pool(struct octeon_device *oct)
 639 {
 640         int i;
 641         u64 dma_addr;
 642         struct octeon_soft_command *sc;
 643
 644         INIT_LIST_HEAD(&oct->sc_buf_pool.head);
 645         spin_lock_init(&oct->sc_buf_pool.lock);
 646         atomic_set(&oct->sc_buf_pool.alloc_buf_count, 0);
 647
 648         for (i = 0; i < MAX_SOFT_COMMAND_BUFFERS; i++) {
 649                 sc = (struct octeon_soft_command *)
 650                         lio_dma_alloc(oct,
 651                                       SOFT_COMMAND_BUFFER_SIZE,
 652                                           (dma_addr_t *)&dma_addr);
 653                 if (!sc)
 654                         return 1;
 655
 656                 sc->dma_addr = dma_addr;
 657                 sc->size = SOFT_COMMAND_BUFFER_SIZE;
 658
 659                 list_add_tail(&sc->node, &oct->sc_buf_pool.head);
 660         }
 661
 662         return 0;
 663 }
 664
 665 int octeon_free_sc_buffer_pool(struct octeon_device *oct)
 666 {
 667         struct list_head *tmp, *tmp2;
 668         struct octeon_soft_command *sc;
 669
 670         spin_lock(&oct->sc_buf_pool.lock);
 671
 672         list_for_each_safe(tmp, tmp2, &oct->sc_buf_pool.head) {
 673                 list_del(tmp);
 674
 675                 sc = (struct octeon_soft_command *)tmp;
 676
 677                 lio_dma_free(oct, sc->size, sc, sc->dma_addr);
 678         }
 679
 680         INIT_LIST_HEAD(&oct->sc_buf_pool.head);
 681
 682         spin_unlock(&oct->sc_buf_pool.lock);
 683
 684         return 0;
 685 }
 686
 687 struct octeon_soft_command *octeon_alloc_soft_command(struct octeon_device *oct,
 688                                                       u32 datasize,
 689                                                       u32 rdatasize,
 690                                                       u32 ctxsize)
 691 {
 692         u64 dma_addr;
 693         u32 size;
 694         u32 offset = sizeof(struct octeon_soft_command);
 695         struct octeon_soft_command *sc = NULL;
 696         struct list_head *tmp;
 697
 698         BUG_ON((offset + datasize + rdatasize + ctxsize) >
 699                SOFT_COMMAND_BUFFER_SIZE);
 700
 701         spin_lock(&oct->sc_buf_pool.lock);
 702
 703         if (list_empty(&oct->sc_buf_pool.head)) {
 704                 spin_unlock(&oct->sc_buf_pool.lock);
 705                 return NULL;
 706         }
 707
 708         list_for_each(tmp, &oct->sc_buf_pool.head)
 709                 break;
 710
 711         list_del(tmp);
 712
 713         atomic_inc(&oct->sc_buf_pool.alloc_buf_count);
 714
 715         spin_unlock(&oct->sc_buf_pool.lock);
 716
 717         sc = (struct octeon_soft_command *)tmp;
 718
 719         dma_addr = sc->dma_addr;
 720         size = sc->size;
 721
 722         memset(sc, 0, sc->size);
 723
 724         sc->dma_addr = dma_addr;
 725         sc->size = size;
 726
 727         if (ctxsize) {
 728                 sc->ctxptr = (u8 *)sc + offset;
 729                 sc->ctxsize = ctxsize;
 730         }
 731
 732         /* Start data at 128 byte boundary */
 733         offset = (offset + ctxsize + 127) & 0xffffff80;
 734
 735         if (datasize) {
 736                 sc->virtdptr = (u8 *)sc + offset;
 737                 sc->dmadptr = dma_addr + offset;
 738                 sc->datasize = datasize;
 739         }
 740
 741         /* Start rdata at 128 byte boundary */
 742         offset = (offset + datasize + 127) & 0xffffff80;
 743
 744         if (rdatasize) {
 745                 BUG_ON(rdatasize < 16);
 746                 sc->virtrptr = (u8 *)sc + offset;
 747                 sc->dmarptr = dma_addr + offset;
 748                 sc->rdatasize = rdatasize;
 749                 sc->status_word = (u64 *)((u8 *)(sc->virtrptr) + rdatasize - 8);
 750         }
 751
 752         return sc;
 753 }
 754
 755 void octeon_free_soft_command(struct octeon_device *oct,
 756                               struct octeon_soft_command *sc)
 757 {
 758         spin_lock(&oct->sc_buf_pool.lock);
 759
 760         list_add_tail(&sc->node, &oct->sc_buf_pool.head);
 761
 762         atomic_dec(&oct->sc_buf_pool.alloc_buf_count);
 763
 764         spin_unlock(&oct->sc_buf_pool.lock);
 765 }