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   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  * $Id: mthca_cq.c 1369 2004-12-20 16:17:07Z roland $
  33  */
  34
  35 #include <linux/init.h>
  36 #include <linux/hardirq.h>
  37
  38 #include <ib_pack.h>
  39
  40 #include "mthca_dev.h"
  41 #include "mthca_cmd.h"
  42 #include "mthca_memfree.h"
  43
  44 enum {
  45         MTHCA_MAX_DIRECT_CQ_SIZE = 4 * PAGE_SIZE
  46 };
  47
  48 enum {
  49         MTHCA_CQ_ENTRY_SIZE = 0x20
  50 };
  51
  52 /*
  53  * Must be packed because start is 64 bits but only aligned to 32 bits.
  54  */
  55 struct mthca_cq_context {
  56         u32 flags;
  57         u64 start;
  58         u32 logsize_usrpage;
  59         u32 error_eqn;          /* Tavor only */
  60         u32 comp_eqn;
  61         u32 pd;
  62         u32 lkey;
  63         u32 last_notified_index;
  64         u32 solicit_producer_index;
  65         u32 consumer_index;
  66         u32 producer_index;
  67         u32 cqn;
  68         u32 ci_db;              /* Arbel only */
  69         u32 state_db;           /* Arbel only */
  70         u32 reserved;
  71 } __attribute__((packed));
  72
  73 #define MTHCA_CQ_STATUS_OK          ( 0 << 28)
  74 #define MTHCA_CQ_STATUS_OVERFLOW    ( 9 << 28)
  75 #define MTHCA_CQ_STATUS_WRITE_FAIL  (10 << 28)
  76 #define MTHCA_CQ_FLAG_TR            ( 1 << 18)
  77 #define MTHCA_CQ_FLAG_OI            ( 1 << 17)
  78 #define MTHCA_CQ_STATE_DISARMED     ( 0 <<  8)
  79 #define MTHCA_CQ_STATE_ARMED        ( 1 <<  8)
  80 #define MTHCA_CQ_STATE_ARMED_SOL    ( 4 <<  8)
  81 #define MTHCA_EQ_STATE_FIRED        (10 <<  8)
  82
  83 enum {
  84         MTHCA_ERROR_CQE_OPCODE_MASK = 0xfe
  85 };
  86
  87 enum {
  88         SYNDROME_LOCAL_LENGTH_ERR        = 0x01,
  89         SYNDROME_LOCAL_QP_OP_ERR         = 0x02,
  90         SYNDROME_LOCAL_EEC_OP_ERR        = 0x03,
  91         SYNDROME_LOCAL_PROT_ERR          = 0x04,
  92         SYNDROME_WR_FLUSH_ERR            = 0x05,
  93         SYNDROME_MW_BIND_ERR             = 0x06,
  94         SYNDROME_BAD_RESP_ERR            = 0x10,
  95         SYNDROME_LOCAL_ACCESS_ERR        = 0x11,
  96         SYNDROME_REMOTE_INVAL_REQ_ERR    = 0x12,
  97         SYNDROME_REMOTE_ACCESS_ERR       = 0x13,
  98         SYNDROME_REMOTE_OP_ERR           = 0x14,
  99         SYNDROME_RETRY_EXC_ERR           = 0x15,
 100         SYNDROME_RNR_RETRY_EXC_ERR       = 0x16,
 101         SYNDROME_LOCAL_RDD_VIOL_ERR      = 0x20,
 102         SYNDROME_REMOTE_INVAL_RD_REQ_ERR = 0x21,
 103         SYNDROME_REMOTE_ABORTED_ERR      = 0x22,
 104         SYNDROME_INVAL_EECN_ERR          = 0x23,
 105         SYNDROME_INVAL_EEC_STATE_ERR     = 0x24
 106 };
 107
 108 struct mthca_cqe {
 109         u32 my_qpn;
 110         u32 my_ee;
 111         u32 rqpn;
 112         u16 sl_g_mlpath;
 113         u16 rlid;
 114         u32 imm_etype_pkey_eec;
 115         u32 byte_cnt;
 116         u32 wqe;
 117         u8  opcode;
 118         u8  is_send;
 119         u8  reserved;
 120         u8  owner;
 121 };
 122
 123 struct mthca_err_cqe {
 124         u32 my_qpn;
 125         u32 reserved1[3];
 126         u8  syndrome;
 127         u8  reserved2;
 128         u16 db_cnt;
 129         u32 reserved3;
 130         u32 wqe;
 131         u8  opcode;
 132         u8  reserved4[2];
 133         u8  owner;
 134 };
 135
 136 #define MTHCA_CQ_ENTRY_OWNER_SW      (0 << 7)
 137 #define MTHCA_CQ_ENTRY_OWNER_HW      (1 << 7)
 138
 139 #define MTHCA_TAVOR_CQ_DB_INC_CI       (1 << 24)
 140 #define MTHCA_TAVOR_CQ_DB_REQ_NOT      (2 << 24)
 141 #define MTHCA_TAVOR_CQ_DB_REQ_NOT_SOL  (3 << 24)
 142 #define MTHCA_TAVOR_CQ_DB_SET_CI       (4 << 24)
 143 #define MTHCA_TAVOR_CQ_DB_REQ_NOT_MULT (5 << 24)
 144
 145 #define MTHCA_ARBEL_CQ_DB_REQ_NOT_SOL  (1 << 24)
 146 #define MTHCA_ARBEL_CQ_DB_REQ_NOT      (2 << 24)
 147 #define MTHCA_ARBEL_CQ_DB_REQ_NOT_MULT (3 << 24)
 148
 149 static inline struct mthca_cqe *get_cqe(struct mthca_cq *cq, int entry)
 150 {
 151         if (cq->is_direct)
 152                 return cq->queue.direct.buf + (entry * MTHCA_CQ_ENTRY_SIZE);
 153         else
 154                 return cq->queue.page_list[entry * MTHCA_CQ_ENTRY_SIZE / PAGE_SIZE].buf
 155                         + (entry * MTHCA_CQ_ENTRY_SIZE) % PAGE_SIZE;
 156 }
 157
 158 static inline struct mthca_cqe *cqe_sw(struct mthca_cq *cq, int i)
 159 {
 160         struct mthca_cqe *cqe = get_cqe(cq, i);
 161         return MTHCA_CQ_ENTRY_OWNER_HW & cqe->owner ? NULL : cqe;
 162 }
 163
 164 static inline struct mthca_cqe *next_cqe_sw(struct mthca_cq *cq)
 165 {
 166         return cqe_sw(cq, cq->cons_index & cq->ibcq.cqe);
 167 }
 168
 169 static inline void set_cqe_hw(struct mthca_cqe *cqe)
 170 {
 171         cqe->owner = MTHCA_CQ_ENTRY_OWNER_HW;
 172 }
 173
 174 /*
 175  * incr is ignored in native Arbel (mem-free) mode, so cq->cons_index
 176  * should be correct before calling update_cons_index().
 177  */
 178 static inline void update_cons_index(struct mthca_dev *dev, struct mthca_cq *cq,
 179                                      int incr)
 180 {
 181         u32 doorbell[2];
 182
 183         if (dev->hca_type == ARBEL_NATIVE) {
 184                 *cq->set_ci_db = cpu_to_be32(cq->cons_index);
 185                 wmb();
 186         } else {
 187                 doorbell[0] = cpu_to_be32(MTHCA_TAVOR_CQ_DB_INC_CI | cq->cqn);
 188                 doorbell[1] = cpu_to_be32(incr - 1);
 189
 190                 mthca_write64(doorbell,
 191                               dev->kar + MTHCA_CQ_DOORBELL,
 192                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
 193         }
 194 }
 195
 196 void mthca_cq_event(struct mthca_dev *dev, u32 cqn)
 197 {
 198         struct mthca_cq *cq;
 199
 200         cq = mthca_array_get(&dev->cq_table.cq, cqn & (dev->limits.num_cqs - 1));
 201
 202         if (!cq) {
 203                 mthca_warn(dev, "Completion event for bogus CQ %08x\n", cqn);
 204                 return;
 205         }
 206
 207         ++cq->arm_sn;
 208
 209         cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
 210 }
 211
 212 void mthca_cq_clean(struct mthca_dev *dev, u32 cqn, u32 qpn)
 213 {
 214         struct mthca_cq *cq;
 215         struct mthca_cqe *cqe;
 216         int prod_index;
 217         int nfreed = 0;
 218
 219         spin_lock_irq(&dev->cq_table.lock);
 220         cq = mthca_array_get(&dev->cq_table.cq, cqn & (dev->limits.num_cqs - 1));
 221         if (cq)
 222                 atomic_inc(&cq->refcount);
 223         spin_unlock_irq(&dev->cq_table.lock);
 224
 225         if (!cq)
 226                 return;
 227
 228         spin_lock_irq(&cq->lock);
 229
 230         /*
 231          * First we need to find the current producer index, so we
 232          * know where to start cleaning from.  It doesn't matter if HW
 233          * adds new entries after this loop -- the QP we're worried
 234          * about is already in RESET, so the new entries won't come
 235          * from our QP and therefore don't need to be checked.
 236          */
 237         for (prod_index = cq->cons_index;
 238              cqe_sw(cq, prod_index & cq->ibcq.cqe);
 239              ++prod_index)
 240                 if (prod_index == cq->cons_index + cq->ibcq.cqe)
 241                         break;
 242
 243         if (0)
 244                 mthca_dbg(dev, "Cleaning QPN %06x from CQN %06x; ci %d, pi %d\n",
 245                           qpn, cqn, cq->cons_index, prod_index);
 246
 247         /*
 248          * Now sweep backwards through the CQ, removing CQ entries
 249          * that match our QP by copying older entries on top of them.
 250          */
 251         while (prod_index > cq->cons_index) {
 252                 cqe = get_cqe(cq, (prod_index - 1) & cq->ibcq.cqe);
 253                 if (cqe->my_qpn == cpu_to_be32(qpn))
 254                         ++nfreed;
 255                 else if (nfreed)
 256                         memcpy(get_cqe(cq, (prod_index - 1 + nfreed) &
 257                                        cq->ibcq.cqe),
 258                                cqe,
 259                                MTHCA_CQ_ENTRY_SIZE);
 260                 --prod_index;
 261         }
 262
 263         if (nfreed) {
 264                 wmb();
 265                 cq->cons_index += nfreed;
 266                 update_cons_index(dev, cq, nfreed);
 267         }
 268
 269         spin_unlock_irq(&cq->lock);
 270         if (atomic_dec_and_test(&cq->refcount))
 271                 wake_up(&cq->wait);
 272 }
 273
 274 static int handle_error_cqe(struct mthca_dev *dev, struct mthca_cq *cq,
 275                             struct mthca_qp *qp, int wqe_index, int is_send,
 276                             struct mthca_err_cqe *cqe,
 277                             struct ib_wc *entry, int *free_cqe)
 278 {
 279         int err;
 280         int dbd;
 281         u32 new_wqe;
 282
 283         if (1 && cqe->syndrome != SYNDROME_WR_FLUSH_ERR) {
 284                 int j;
 285
 286                 mthca_dbg(dev, "%x/%d: error CQE -> QPN %06x, WQE @ %08x\n",
 287                           cq->cqn, cq->cons_index, be32_to_cpu(cqe->my_qpn),
 288                           be32_to_cpu(cqe->wqe));
 289
 290                 for (j = 0; j < 8; ++j)
 291                         printk(KERN_DEBUG "  [%2x] %08x\n",
 292                                j * 4, be32_to_cpu(((u32 *) cqe)[j]));
 293         }
 294
 295         /*
 296          * For completions in error, only work request ID, status (and
 297          * freed resource count for RD) have to be set.
 298          */
 299         switch (cqe->syndrome) {
 300         case SYNDROME_LOCAL_LENGTH_ERR:
 301                 entry->status = IB_WC_LOC_LEN_ERR;
 302                 break;
 303         case SYNDROME_LOCAL_QP_OP_ERR:
 304                 entry->status = IB_WC_LOC_QP_OP_ERR;
 305                 break;
 306         case SYNDROME_LOCAL_EEC_OP_ERR:
 307                 entry->status = IB_WC_LOC_EEC_OP_ERR;
 308                 break;
 309         case SYNDROME_LOCAL_PROT_ERR:
 310                 entry->status = IB_WC_LOC_PROT_ERR;
 311                 break;
 312         case SYNDROME_WR_FLUSH_ERR:
 313                 entry->status = IB_WC_WR_FLUSH_ERR;
 314                 break;
 315         case SYNDROME_MW_BIND_ERR:
 316                 entry->status = IB_WC_MW_BIND_ERR;
 317                 break;
 318         case SYNDROME_BAD_RESP_ERR:
 319                 entry->status = IB_WC_BAD_RESP_ERR;
 320                 break;
 321         case SYNDROME_LOCAL_ACCESS_ERR:
 322                 entry->status = IB_WC_LOC_ACCESS_ERR;
 323                 break;
 324         case SYNDROME_REMOTE_INVAL_REQ_ERR:
 325                 entry->status = IB_WC_REM_INV_REQ_ERR;
 326                 break;
 327         case SYNDROME_REMOTE_ACCESS_ERR:
 328                 entry->status = IB_WC_REM_ACCESS_ERR;
 329                 break;
 330         case SYNDROME_REMOTE_OP_ERR:
 331                 entry->status = IB_WC_REM_OP_ERR;
 332                 break;
 333         case SYNDROME_RETRY_EXC_ERR:
 334                 entry->status = IB_WC_RETRY_EXC_ERR;
 335                 break;
 336         case SYNDROME_RNR_RETRY_EXC_ERR:
 337                 entry->status = IB_WC_RNR_RETRY_EXC_ERR;
 338                 break;
 339         case SYNDROME_LOCAL_RDD_VIOL_ERR:
 340                 entry->status = IB_WC_LOC_RDD_VIOL_ERR;
 341                 break;
 342         case SYNDROME_REMOTE_INVAL_RD_REQ_ERR:
 343                 entry->status = IB_WC_REM_INV_RD_REQ_ERR;
 344                 break;
 345         case SYNDROME_REMOTE_ABORTED_ERR:
 346                 entry->status = IB_WC_REM_ABORT_ERR;
 347                 break;
 348         case SYNDROME_INVAL_EECN_ERR:
 349                 entry->status = IB_WC_INV_EECN_ERR;
 350                 break;
 351         case SYNDROME_INVAL_EEC_STATE_ERR:
 352                 entry->status = IB_WC_INV_EEC_STATE_ERR;
 353                 break;
 354         default:
 355                 entry->status = IB_WC_GENERAL_ERR;
 356                 break;
 357         }
 358
 359         err = mthca_free_err_wqe(dev, qp, is_send, wqe_index, &dbd, &new_wqe);
 360         if (err)
 361                 return err;
 362
 363         /*
 364          * If we're at the end of the WQE chain, or we've used up our
 365          * doorbell count, free the CQE.  Otherwise just update it for
 366          * the next poll operation.
 367          */
 368         if (!(new_wqe & cpu_to_be32(0x3f)) || (!cqe->db_cnt && dbd))
 369                 return 0;
 370
 371         cqe->db_cnt   = cpu_to_be16(be16_to_cpu(cqe->db_cnt) - dbd);
 372         cqe->wqe      = new_wqe;
 373         cqe->syndrome = SYNDROME_WR_FLUSH_ERR;
 374
 375         *free_cqe = 0;
 376
 377         return 0;
 378 }
 379
 380 static void dump_cqe(struct mthca_cqe *cqe)
 381 {
 382         int j;
 383
 384         for (j = 0; j < 8; ++j)
 385                 printk(KERN_DEBUG "  [%2x] %08x\n",
 386                        j * 4, be32_to_cpu(((u32 *) cqe)[j]));
 387 }
 388
 389 static inline int mthca_poll_one(struct mthca_dev *dev,
 390                                  struct mthca_cq *cq,
 391                                  struct mthca_qp **cur_qp,
 392                                  int *freed,
 393                                  struct ib_wc *entry)
 394 {
 395         struct mthca_wq *wq;
 396         struct mthca_cqe *cqe;
 397         int wqe_index;
 398         int is_error;
 399         int is_send;
 400         int free_cqe = 1;
 401         int err = 0;
 402
 403         cqe = next_cqe_sw(cq);
 404         if (!cqe)
 405                 return -EAGAIN;
 406
 407         /*
 408          * Make sure we read CQ entry contents after we've checked the
 409          * ownership bit.
 410          */
 411         rmb();
 412
 413         if (0) {
 414                 mthca_dbg(dev, "%x/%d: CQE -> QPN %06x, WQE @ %08x\n",
 415                           cq->cqn, cq->cons_index, be32_to_cpu(cqe->my_qpn),
 416                           be32_to_cpu(cqe->wqe));
 417
 418                 dump_cqe(cqe);
 419         }
 420
 421         is_error = (cqe->opcode & MTHCA_ERROR_CQE_OPCODE_MASK) ==
 422                 MTHCA_ERROR_CQE_OPCODE_MASK;
 423         is_send  = is_error ? cqe->opcode & 0x01 : cqe->is_send & 0x80;
 424
 425         if (!*cur_qp || be32_to_cpu(cqe->my_qpn) != (*cur_qp)->qpn) {
 426                 /*
 427                  * We do not have to take the QP table lock here,
 428                  * because CQs will be locked while QPs are removed
 429                  * from the table.
 430                  */
 431                 *cur_qp = mthca_array_get(&dev->qp_table.qp,
 432                                           be32_to_cpu(cqe->my_qpn) &
 433                                           (dev->limits.num_qps - 1));
 434                 if (!*cur_qp) {
 435                         mthca_warn(dev, "CQ entry for unknown QP %06x\n",
 436                                    be32_to_cpu(cqe->my_qpn) & 0xffffff);
 437                         err = -EINVAL;
 438                         goto out;
 439                 }
 440         }
 441
 442         entry->qp_num = (*cur_qp)->qpn;
 443
 444         if (is_send) {
 445                 wq = &(*cur_qp)->sq;
 446                 wqe_index = ((be32_to_cpu(cqe->wqe) - (*cur_qp)->send_wqe_offset)
 447                              >> wq->wqe_shift);
 448                 entry->wr_id = (*cur_qp)->wrid[wqe_index +
 449                                                (*cur_qp)->rq.max];
 450         } else {
 451                 wq = &(*cur_qp)->rq;
 452                 wqe_index = be32_to_cpu(cqe->wqe) >> wq->wqe_shift;
 453                 entry->wr_id = (*cur_qp)->wrid[wqe_index];
 454         }
 455
 456         if (wq->last_comp < wqe_index)
 457                 wq->tail += wqe_index - wq->last_comp;
 458         else
 459                 wq->tail += wqe_index + wq->max - wq->last_comp;
 460
 461         wq->last_comp = wqe_index;
 462
 463         if (0)
 464                 mthca_dbg(dev, "%s completion for QP %06x, index %d (nr %d)\n",
 465                           is_send ? "Send" : "Receive",
 466                           (*cur_qp)->qpn, wqe_index, wq->max);
 467
 468         if (is_error) {
 469                 err = handle_error_cqe(dev, cq, *cur_qp, wqe_index, is_send,
 470                                        (struct mthca_err_cqe *) cqe,
 471                                        entry, &free_cqe);
 472                 goto out;
 473         }
 474
 475         if (is_send) {
 476                 entry->opcode = IB_WC_SEND; /* XXX */
 477         } else {
 478                 entry->byte_len = be32_to_cpu(cqe->byte_cnt);
 479                 switch (cqe->opcode & 0x1f) {
 480                 case IB_OPCODE_SEND_LAST_WITH_IMMEDIATE:
 481                 case IB_OPCODE_SEND_ONLY_WITH_IMMEDIATE:
 482                         entry->wc_flags = IB_WC_WITH_IMM;
 483                         entry->imm_data = cqe->imm_etype_pkey_eec;
 484                         entry->opcode = IB_WC_RECV;
 485                         break;
 486                 case IB_OPCODE_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 487                 case IB_OPCODE_RDMA_WRITE_ONLY_WITH_IMMEDIATE:
 488                         entry->wc_flags = IB_WC_WITH_IMM;
 489                         entry->imm_data = cqe->imm_etype_pkey_eec;
 490                         entry->opcode = IB_WC_RECV_RDMA_WITH_IMM;
 491                         break;
 492                 default:
 493                         entry->wc_flags = 0;
 494                         entry->opcode = IB_WC_RECV;
 495                         break;
 496                 }
 497                 entry->slid        = be16_to_cpu(cqe->rlid);
 498                 entry->sl          = be16_to_cpu(cqe->sl_g_mlpath) >> 12;
 499                 entry->src_qp      = be32_to_cpu(cqe->rqpn) & 0xffffff;
 500                 entry->dlid_path_bits = be16_to_cpu(cqe->sl_g_mlpath) & 0x7f;
 501                 entry->pkey_index  = be32_to_cpu(cqe->imm_etype_pkey_eec) >> 16;
 502                 entry->wc_flags   |= be16_to_cpu(cqe->sl_g_mlpath) & 0x80 ?
 503                                         IB_WC_GRH : 0;
 504         }
 505
 506         entry->status = IB_WC_SUCCESS;
 507
 508  out:
 509         if (likely(free_cqe)) {
 510                 set_cqe_hw(cqe);
 511                 ++(*freed);
 512                 ++cq->cons_index;
 513         }
 514
 515         return err;
 516 }
 517
 518 int mthca_poll_cq(struct ib_cq *ibcq, int num_entries,
 519                   struct ib_wc *entry)
 520 {
 521         struct mthca_dev *dev = to_mdev(ibcq->device);
 522         struct mthca_cq *cq = to_mcq(ibcq);
 523         struct mthca_qp *qp = NULL;
 524         unsigned long flags;
 525         int err = 0;
 526         int freed = 0;
 527         int npolled;
 528
 529         spin_lock_irqsave(&cq->lock, flags);
 530
 531         for (npolled = 0; npolled < num_entries; ++npolled) {
 532                 err = mthca_poll_one(dev, cq, &qp,
 533                                      &freed, entry + npolled);
 534                 if (err)
 535                         break;
 536         }
 537
 538         if (freed) {
 539                 wmb();
 540                 update_cons_index(dev, cq, freed);
 541         }
 542
 543         spin_unlock_irqrestore(&cq->lock, flags);
 544
 545         return err == 0 || err == -EAGAIN ? npolled : err;
 546 }
 547
 548 int mthca_tavor_arm_cq(struct ib_cq *cq, enum ib_cq_notify notify)
 549 {
 550         u32 doorbell[2];
 551
 552         doorbell[0] = cpu_to_be32((notify == IB_CQ_SOLICITED ?
 553                                    MTHCA_TAVOR_CQ_DB_REQ_NOT_SOL :
 554                                    MTHCA_TAVOR_CQ_DB_REQ_NOT)      |
 555                                   to_mcq(cq)->cqn);
 556         doorbell[1] = 0xffffffff;
 557
 558         mthca_write64(doorbell,
 559                       to_mdev(cq->device)->kar + MTHCA_CQ_DOORBELL,
 560                       MTHCA_GET_DOORBELL_LOCK(&to_mdev(cq->device)->doorbell_lock));
 561
 562         return 0;
 563 }
 564
 565 int mthca_arbel_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify notify)
 566 {
 567         struct mthca_cq *cq = to_mcq(ibcq);
 568         u32 doorbell[2];
 569         u32 sn;
 570         u32 ci;
 571
 572         sn = cq->arm_sn & 3;
 573         ci = cpu_to_be32(cq->cons_index);
 574
 575         doorbell[0] = ci;
 576         doorbell[1] = cpu_to_be32((cq->cqn << 8) | (2 << 5) | (sn << 3) |
 577                                   (notify == IB_CQ_SOLICITED ? 1 : 2));
 578
 579         mthca_write_db_rec(doorbell, cq->arm_db);
 580
 581         /*
 582          * Make sure that the doorbell record in host memory is
 583          * written before ringing the doorbell via PCI MMIO.
 584          */
 585         wmb();
 586
 587         doorbell[0] = cpu_to_be32((sn << 28)                       |
 588                                   (notify == IB_CQ_SOLICITED ?
 589                                    MTHCA_ARBEL_CQ_DB_REQ_NOT_SOL :
 590                                    MTHCA_ARBEL_CQ_DB_REQ_NOT)      |
 591                                   cq->cqn);
 592         doorbell[1] = ci;
 593
 594         mthca_write64(doorbell,
 595                       to_mdev(ibcq->device)->kar + MTHCA_CQ_DOORBELL,
 596                       MTHCA_GET_DOORBELL_LOCK(&to_mdev(ibcq->device)->doorbell_lock));
 597
 598         return 0;
 599 }
 600
 601 static void mthca_free_cq_buf(struct mthca_dev *dev, struct mthca_cq *cq)
 602 {
 603         int i;
 604         int size;
 605
 606         if (cq->is_direct)
 607                 pci_free_consistent(dev->pdev,
 608                                     (cq->ibcq.cqe + 1) * MTHCA_CQ_ENTRY_SIZE,
 609                                     cq->queue.direct.buf,
 610                                     pci_unmap_addr(&cq->queue.direct,
 611                                                    mapping));
 612         else {
 613                 size = (cq->ibcq.cqe + 1) * MTHCA_CQ_ENTRY_SIZE;
 614                 for (i = 0; i < (size + PAGE_SIZE - 1) / PAGE_SIZE; ++i)
 615                         if (cq->queue.page_list[i].buf)
 616                                 pci_free_consistent(dev->pdev, PAGE_SIZE,
 617                                                     cq->queue.page_list[i].buf,
 618                                                     pci_unmap_addr(&cq->queue.page_list[i],
 619                                                                    mapping));
 620
 621                 kfree(cq->queue.page_list);
 622         }
 623 }
 624
 625 static int mthca_alloc_cq_buf(struct mthca_dev *dev, int size,
 626                               struct mthca_cq *cq)
 627 {
 628         int err = -ENOMEM;
 629         int npages, shift;
 630         u64 *dma_list = NULL;
 631         dma_addr_t t;
 632         int i;
 633
 634         if (size <= MTHCA_MAX_DIRECT_CQ_SIZE) {
 635                 cq->is_direct = 1;
 636                 npages        = 1;
 637                 shift         = get_order(size) + PAGE_SHIFT;
 638
 639                 cq->queue.direct.buf = pci_alloc_consistent(dev->pdev,
 640                                                             size, &t);
 641                 if (!cq->queue.direct.buf)
 642                         return -ENOMEM;
 643
 644                 pci_unmap_addr_set(&cq->queue.direct, mapping, t);
 645
 646                 memset(cq->queue.direct.buf, 0, size);
 647
 648                 while (t & ((1 << shift) - 1)) {
 649                         --shift;
 650                         npages *= 2;
 651                 }
 652
 653                 dma_list = kmalloc(npages * sizeof *dma_list, GFP_KERNEL);
 654                 if (!dma_list)
 655                         goto err_free;
 656
 657                 for (i = 0; i < npages; ++i)
 658                         dma_list[i] = t + i * (1 << shift);
 659         } else {
 660                 cq->is_direct = 0;
 661                 npages        = (size + PAGE_SIZE - 1) / PAGE_SIZE;
 662                 shift         = PAGE_SHIFT;
 663
 664                 dma_list = kmalloc(npages * sizeof *dma_list, GFP_KERNEL);
 665                 if (!dma_list)
 666                         return -ENOMEM;
 667
 668                 cq->queue.page_list = kmalloc(npages * sizeof *cq->queue.page_list,
 669                                               GFP_KERNEL);
 670                 if (!cq->queue.page_list)
 671                         goto err_out;
 672
 673                 for (i = 0; i < npages; ++i)
 674                         cq->queue.page_list[i].buf = NULL;
 675
 676                 for (i = 0; i < npages; ++i) {
 677                         cq->queue.page_list[i].buf =
 678                                 pci_alloc_consistent(dev->pdev, PAGE_SIZE, &t);
 679                         if (!cq->queue.page_list[i].buf)
 680                                 goto err_free;
 681
 682                         dma_list[i] = t;
 683                         pci_unmap_addr_set(&cq->queue.page_list[i], mapping, t);
 684
 685                         memset(cq->queue.page_list[i].buf, 0, PAGE_SIZE);
 686                 }
 687         }
 688
 689         err = mthca_mr_alloc_phys(dev, dev->driver_pd.pd_num,
 690                                   dma_list, shift, npages,
 691                                   0, size,
 692                                   MTHCA_MPT_FLAG_LOCAL_WRITE |
 693                                   MTHCA_MPT_FLAG_LOCAL_READ,
 694                                   &cq->mr);
 695         if (err)
 696                 goto err_free;
 697
 698         kfree(dma_list);
 699
 700         return 0;
 701
 702 err_free:
 703         mthca_free_cq_buf(dev, cq);
 704
 705 err_out:
 706         kfree(dma_list);
 707
 708         return err;
 709 }
 710
 711 int mthca_init_cq(struct mthca_dev *dev, int nent,
 712                   struct mthca_cq *cq)
 713 {
 714         int size = nent * MTHCA_CQ_ENTRY_SIZE;
 715         void *mailbox = NULL;
 716         struct mthca_cq_context *cq_context;
 717         int err = -ENOMEM;
 718         u8 status;
 719         int i;
 720
 721         might_sleep();
 722
 723         cq->ibcq.cqe = nent - 1;
 724
 725         cq->cqn = mthca_alloc(&dev->cq_table.alloc);
 726         if (cq->cqn == -1)
 727                 return -ENOMEM;
 728
 729         if (dev->hca_type == ARBEL_NATIVE) {
 730                 cq->arm_sn = 1;
 731
 732                 err = mthca_table_get(dev, dev->cq_table.table, cq->cqn);
 733                 if (err)
 734                         goto err_out;
 735
 736                 err = -ENOMEM;
 737
 738                 cq->set_ci_db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_CQ_SET_CI,
 739                                                      cq->cqn, &cq->set_ci_db);
 740                 if (cq->set_ci_db_index < 0)
 741                         goto err_out_icm;
 742
 743                 cq->arm_db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_CQ_ARM,
 744                                                   cq->cqn, &cq->arm_db);
 745                 if (cq->arm_db_index < 0)
 746                         goto err_out_ci;
 747         }
 748
 749         mailbox = kmalloc(sizeof (struct mthca_cq_context) + MTHCA_CMD_MAILBOX_EXTRA,
 750                           GFP_KERNEL);
 751         if (!mailbox)
 752                 goto err_out_mailbox;
 753
 754         cq_context = MAILBOX_ALIGN(mailbox);
 755
 756         err = mthca_alloc_cq_buf(dev, size, cq);
 757         if (err)
 758                 goto err_out_mailbox;
 759
 760         for (i = 0; i < nent; ++i)
 761                 set_cqe_hw(get_cqe(cq, i));
 762
 763         spin_lock_init(&cq->lock);
 764         atomic_set(&cq->refcount, 1);
 765         init_waitqueue_head(&cq->wait);
 766
 767         memset(cq_context, 0, sizeof *cq_context);
 768         cq_context->flags           = cpu_to_be32(MTHCA_CQ_STATUS_OK      |
 769                                                   MTHCA_CQ_STATE_DISARMED |
 770                                                   MTHCA_CQ_FLAG_TR);
 771         cq_context->start           = cpu_to_be64(0);
 772         cq_context->logsize_usrpage = cpu_to_be32((ffs(nent) - 1) << 24 |
 773                                                   dev->driver_uar.index);
 774         cq_context->error_eqn       = cpu_to_be32(dev->eq_table.eq[MTHCA_EQ_ASYNC].eqn);
 775         cq_context->comp_eqn        = cpu_to_be32(dev->eq_table.eq[MTHCA_EQ_COMP].eqn);
 776         cq_context->pd              = cpu_to_be32(dev->driver_pd.pd_num);
 777         cq_context->lkey            = cpu_to_be32(cq->mr.ibmr.lkey);
 778         cq_context->cqn             = cpu_to_be32(cq->cqn);
 779
 780         if (dev->hca_type == ARBEL_NATIVE) {
 781                 cq_context->ci_db    = cpu_to_be32(cq->set_ci_db_index);
 782                 cq_context->state_db = cpu_to_be32(cq->arm_db_index);
 783         }
 784
 785         err = mthca_SW2HW_CQ(dev, cq_context, cq->cqn, &status);
 786         if (err) {
 787                 mthca_warn(dev, "SW2HW_CQ failed (%d)\n", err);
 788                 goto err_out_free_mr;
 789         }
 790
 791         if (status) {
 792                 mthca_warn(dev, "SW2HW_CQ returned status 0x%02x\n",
 793                            status);
 794                 err = -EINVAL;
 795                 goto err_out_free_mr;
 796         }
 797
 798         spin_lock_irq(&dev->cq_table.lock);
 799         if (mthca_array_set(&dev->cq_table.cq,
 800                             cq->cqn & (dev->limits.num_cqs - 1),
 801                             cq)) {
 802                 spin_unlock_irq(&dev->cq_table.lock);
 803                 goto err_out_free_mr;
 804         }
 805         spin_unlock_irq(&dev->cq_table.lock);
 806
 807         cq->cons_index = 0;
 808
 809         kfree(mailbox);
 810
 811         return 0;
 812
 813 err_out_free_mr:
 814         mthca_free_mr(dev, &cq->mr);
 815         mthca_free_cq_buf(dev, cq);
 816
 817 err_out_mailbox:
 818         kfree(mailbox);
 819
 820         mthca_free_db(dev, MTHCA_DB_TYPE_CQ_ARM, cq->arm_db_index);
 821
 822 err_out_ci:
 823         mthca_free_db(dev, MTHCA_DB_TYPE_CQ_SET_CI, cq->set_ci_db_index);
 824
 825 err_out_icm:
 826         mthca_table_put(dev, dev->cq_table.table, cq->cqn);
 827
 828 err_out:
 829         mthca_free(&dev->cq_table.alloc, cq->cqn);
 830
 831         return err;
 832 }
 833
 834 void mthca_free_cq(struct mthca_dev *dev,
 835                    struct mthca_cq *cq)
 836 {
 837         void *mailbox;
 838         int err;
 839         u8 status;
 840
 841         might_sleep();
 842
 843         mailbox = kmalloc(sizeof (struct mthca_cq_context) + MTHCA_CMD_MAILBOX_EXTRA,
 844                           GFP_KERNEL);
 845         if (!mailbox) {
 846                 mthca_warn(dev, "No memory for mailbox to free CQ.\n");
 847                 return;
 848         }
 849
 850         err = mthca_HW2SW_CQ(dev, MAILBOX_ALIGN(mailbox), cq->cqn, &status);
 851         if (err)
 852                 mthca_warn(dev, "HW2SW_CQ failed (%d)\n", err);
 853         else if (status)
 854                 mthca_warn(dev, "HW2SW_CQ returned status 0x%02x\n",
 855                            status);
 856
 857         if (0) {
 858                 u32 *ctx = MAILBOX_ALIGN(mailbox);
 859                 int j;
 860
 861                 printk(KERN_ERR "context for CQN %x (cons index %x, next sw %d)\n",
 862                        cq->cqn, cq->cons_index, !!next_cqe_sw(cq));
 863                 for (j = 0; j < 16; ++j)
 864                         printk(KERN_ERR "[%2x] %08x\n", j * 4, be32_to_cpu(ctx[j]));
 865         }
 866
 867         spin_lock_irq(&dev->cq_table.lock);
 868         mthca_array_clear(&dev->cq_table.cq,
 869                           cq->cqn & (dev->limits.num_cqs - 1));
 870         spin_unlock_irq(&dev->cq_table.lock);
 871
 872         if (dev->mthca_flags & MTHCA_FLAG_MSI_X)
 873                 synchronize_irq(dev->eq_table.eq[MTHCA_EQ_COMP].msi_x_vector);
 874         else
 875                 synchronize_irq(dev->pdev->irq);
 876
 877         atomic_dec(&cq->refcount);
 878         wait_event(cq->wait, !atomic_read(&cq->refcount));
 879
 880         mthca_free_mr(dev, &cq->mr);
 881         mthca_free_cq_buf(dev, cq);
 882
 883         if (dev->hca_type == ARBEL_NATIVE) {
 884                 mthca_free_db(dev, MTHCA_DB_TYPE_CQ_ARM,    cq->arm_db_index);
 885                 mthca_free_db(dev, MTHCA_DB_TYPE_CQ_SET_CI, cq->set_ci_db_index);
 886                 mthca_table_put(dev, dev->cq_table.table, cq->cqn);
 887         }
 888
 889         mthca_free(&dev->cq_table.alloc, cq->cqn);
 890         kfree(mailbox);
 891 }
 892
 893 int __devinit mthca_init_cq_table(struct mthca_dev *dev)
 894 {
 895         int err;
 896
 897         spin_lock_init(&dev->cq_table.lock);
 898
 899         err = mthca_alloc_init(&dev->cq_table.alloc,
 900                                dev->limits.num_cqs,
 901                                (1 << 24) - 1,
 902                                dev->limits.reserved_cqs);
 903         if (err)
 904                 return err;
 905
 906         err = mthca_array_init(&dev->cq_table.cq,
 907                                dev->limits.num_cqs);
 908         if (err)
 909                 mthca_alloc_cleanup(&dev->cq_table.alloc);
 910
 911         return err;
 912 }
 913
 914 void __devexit mthca_cleanup_cq_table(struct mthca_dev *dev)
 915 {
 916         mthca_array_cleanup(&dev->cq_table.cq, dev->limits.num_cqs);
 917         mthca_alloc_cleanup(&dev->cq_table.alloc);
 918 }