drivers/infiniband/hw/hns/hns_roce_cq.c

   1 /*
   2  * Copyright (c) 2016 Hisilicon Limited.
   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
  33 #include <rdma/ib_umem.h>
  34 #include <rdma/uverbs_ioctl.h>
  35 #include "hns_roce_device.h"
  36 #include "hns_roce_cmd.h"
  37 #include "hns_roce_hem.h"
  38 #include "hns_roce_common.h"
  39
  40 static u8 get_least_load_bankid_for_cq(struct hns_roce_bank *bank)
  41 {
  42         u32 least_load = bank[0].inuse;
  43         u8 bankid = 0;
  44         u32 bankcnt;
  45         u8 i;
  46
  47         for (i = 1; i < HNS_ROCE_CQ_BANK_NUM; i++) {
  48                 bankcnt = bank[i].inuse;
  49                 if (bankcnt < least_load) {
  50                         least_load = bankcnt;
  51                         bankid = i;
  52                 }
  53         }
  54
  55         return bankid;
  56 }
  57
  58 static int alloc_cqn(struct hns_roce_dev *hr_dev, struct hns_roce_cq *hr_cq)
  59 {
  60         struct hns_roce_cq_table *cq_table = &hr_dev->cq_table;
  61         struct hns_roce_bank *bank;
  62         u8 bankid;
  63         int id;
  64
  65         mutex_lock(&cq_table->bank_mutex);
  66         bankid = get_least_load_bankid_for_cq(cq_table->bank);
  67         bank = &cq_table->bank[bankid];
  68
  69         id = ida_alloc_range(&bank->ida, bank->min, bank->max, GFP_KERNEL);
  70         if (id < 0) {
  71                 mutex_unlock(&cq_table->bank_mutex);
  72                 return id;
  73         }
  74
  75         /* the lower 2 bits is bankid */
  76         hr_cq->cqn = (id << CQ_BANKID_SHIFT) | bankid;
  77         bank->inuse++;
  78         mutex_unlock(&cq_table->bank_mutex);
  79
  80         return 0;
  81 }
  82
  83 static inline u8 get_cq_bankid(unsigned long cqn)
  84 {
  85         /* The lower 2 bits of CQN are used to hash to different banks */
  86         return (u8)(cqn & GENMASK(1, 0));
  87 }
  88
  89 static void free_cqn(struct hns_roce_dev *hr_dev, unsigned long cqn)
  90 {
  91         struct hns_roce_cq_table *cq_table = &hr_dev->cq_table;
  92         struct hns_roce_bank *bank;
  93
  94         bank = &cq_table->bank[get_cq_bankid(cqn)];
  95
  96         ida_free(&bank->ida, cqn >> CQ_BANKID_SHIFT);
  97
  98         mutex_lock(&cq_table->bank_mutex);
  99         bank->inuse--;
 100         mutex_unlock(&cq_table->bank_mutex);
 101 }
 102
 103 static int hns_roce_create_cqc(struct hns_roce_dev *hr_dev,
 104                                struct hns_roce_cq *hr_cq,
 105                                u64 *mtts, dma_addr_t dma_handle)
 106 {
 107         struct ib_device *ibdev = &hr_dev->ib_dev;
 108         struct hns_roce_cmd_mailbox *mailbox;
 109         int ret;
 110
 111         mailbox = hns_roce_alloc_cmd_mailbox(hr_dev);
 112         if (IS_ERR(mailbox)) {
 113                 ibdev_err(ibdev, "failed to alloc mailbox for CQC.\n");
 114                 return PTR_ERR(mailbox);
 115         }
 116
 117         hr_dev->hw->write_cqc(hr_dev, hr_cq, mailbox->buf, mtts, dma_handle);
 118
 119         ret = hns_roce_create_hw_ctx(hr_dev, mailbox, HNS_ROCE_CMD_CREATE_CQC,
 120                                      hr_cq->cqn);
 121         if (ret)
 122                 ibdev_err(ibdev,
 123                           "failed to send create cmd for CQ(0x%lx), ret = %d.\n",
 124                           hr_cq->cqn, ret);
 125
 126         hns_roce_free_cmd_mailbox(hr_dev, mailbox);
 127
 128         return ret;
 129 }
 130
 131 static int alloc_cqc(struct hns_roce_dev *hr_dev, struct hns_roce_cq *hr_cq)
 132 {
 133         struct hns_roce_cq_table *cq_table = &hr_dev->cq_table;
 134         struct ib_device *ibdev = &hr_dev->ib_dev;
 135         u64 mtts[MTT_MIN_COUNT] = {};
 136         int ret;
 137
 138         ret = hns_roce_mtr_find(hr_dev, &hr_cq->mtr, 0, mtts, ARRAY_SIZE(mtts));
 139         if (ret) {
 140                 ibdev_err(ibdev, "failed to find CQ mtr, ret = %d.\n", ret);
 141                 return ret;
 142         }
 143
 144         /* Get CQC memory HEM(Hardware Entry Memory) table */
 145         ret = hns_roce_table_get(hr_dev, &cq_table->table, hr_cq->cqn);
 146         if (ret) {
 147                 ibdev_err(ibdev, "failed to get CQ(0x%lx) context, ret = %d.\n",
 148                           hr_cq->cqn, ret);
 149                 return ret;
 150         }
 151
 152         ret = xa_err(xa_store_irq(&cq_table->array, hr_cq->cqn, hr_cq, GFP_KERNEL));
 153         if (ret) {
 154                 ibdev_err(ibdev, "failed to xa_store CQ, ret = %d.\n", ret);
 155                 goto err_put;
 156         }
 157
 158         ret = hns_roce_create_cqc(hr_dev, hr_cq, mtts,
 159                                   hns_roce_get_mtr_ba(&hr_cq->mtr));
 160         if (ret)
 161                 goto err_xa;
 162
 163         return 0;
 164
 165 err_xa:
 166         xa_erase_irq(&cq_table->array, hr_cq->cqn);
 167 err_put:
 168         hns_roce_table_put(hr_dev, &cq_table->table, hr_cq->cqn);
 169
 170         return ret;
 171 }
 172
 173 static void free_cqc(struct hns_roce_dev *hr_dev, struct hns_roce_cq *hr_cq)
 174 {
 175         struct hns_roce_cq_table *cq_table = &hr_dev->cq_table;
 176         struct device *dev = hr_dev->dev;
 177         int ret;
 178
 179         ret = hns_roce_destroy_hw_ctx(hr_dev, HNS_ROCE_CMD_DESTROY_CQC,
 180                                       hr_cq->cqn);
 181         if (ret)
 182                 dev_err_ratelimited(dev, "DESTROY_CQ failed (%d) for CQN %06lx\n",
 183                                     ret, hr_cq->cqn);
 184
 185         xa_erase_irq(&cq_table->array, hr_cq->cqn);
 186
 187         /* Waiting interrupt process procedure carried out */
 188         synchronize_irq(hr_dev->eq_table.eq[hr_cq->vector].irq);
 189
 190         /* wait for all interrupt processed */
 191         if (refcount_dec_and_test(&hr_cq->refcount))
 192                 complete(&hr_cq->free);
 193         wait_for_completion(&hr_cq->free);
 194
 195         hns_roce_table_put(hr_dev, &cq_table->table, hr_cq->cqn);
 196 }
 197
 198 static int alloc_cq_buf(struct hns_roce_dev *hr_dev, struct hns_roce_cq *hr_cq,
 199                         struct ib_udata *udata, unsigned long addr)
 200 {
 201         struct ib_device *ibdev = &hr_dev->ib_dev;
 202         struct hns_roce_buf_attr buf_attr = {};
 203         int ret;
 204
 205         buf_attr.page_shift = hr_dev->caps.cqe_buf_pg_sz + PAGE_SHIFT;
 206         buf_attr.region[0].size = hr_cq->cq_depth * hr_cq->cqe_size;
 207         buf_attr.region[0].hopnum = hr_dev->caps.cqe_hop_num;
 208         buf_attr.region_count = 1;
 209
 210         ret = hns_roce_mtr_create(hr_dev, &hr_cq->mtr, &buf_attr,
 211                                   hr_dev->caps.cqe_ba_pg_sz + PAGE_SHIFT,
 212                                   udata, addr);
 213         if (ret)
 214                 ibdev_err(ibdev, "failed to alloc CQ mtr, ret = %d.\n", ret);
 215
 216         return ret;
 217 }
 218
 219 static void free_cq_buf(struct hns_roce_dev *hr_dev, struct hns_roce_cq *hr_cq)
 220 {
 221         hns_roce_mtr_destroy(hr_dev, &hr_cq->mtr);
 222 }
 223
 224 static int alloc_cq_db(struct hns_roce_dev *hr_dev, struct hns_roce_cq *hr_cq,
 225                        struct ib_udata *udata, unsigned long addr,
 226                        struct hns_roce_ib_create_cq_resp *resp)
 227 {
 228         bool has_db = hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_CQ_RECORD_DB;
 229         struct hns_roce_ucontext *uctx;
 230         int err;
 231
 232         if (udata) {
 233                 if (has_db &&
 234                     udata->outlen >= offsetofend(typeof(*resp), cap_flags)) {
 235                         uctx = rdma_udata_to_drv_context(udata,
 236                                         struct hns_roce_ucontext, ibucontext);
 237                         err = hns_roce_db_map_user(uctx, addr, &hr_cq->db);
 238                         if (err)
 239                                 return err;
 240                         hr_cq->flags |= HNS_ROCE_CQ_FLAG_RECORD_DB;
 241                         resp->cap_flags |= HNS_ROCE_CQ_FLAG_RECORD_DB;
 242                 }
 243         } else {
 244                 if (has_db) {
 245                         err = hns_roce_alloc_db(hr_dev, &hr_cq->db, 1);
 246                         if (err)
 247                                 return err;
 248                         hr_cq->set_ci_db = hr_cq->db.db_record;
 249                         *hr_cq->set_ci_db = 0;
 250                         hr_cq->flags |= HNS_ROCE_CQ_FLAG_RECORD_DB;
 251                 }
 252                 hr_cq->db_reg = hr_dev->reg_base + hr_dev->odb_offset +
 253                                 DB_REG_OFFSET * hr_dev->priv_uar.index;
 254         }
 255
 256         return 0;
 257 }
 258
 259 static void free_cq_db(struct hns_roce_dev *hr_dev, struct hns_roce_cq *hr_cq,
 260                        struct ib_udata *udata)
 261 {
 262         struct hns_roce_ucontext *uctx;
 263
 264         if (!(hr_cq->flags & HNS_ROCE_CQ_FLAG_RECORD_DB))
 265                 return;
 266
 267         hr_cq->flags &= ~HNS_ROCE_CQ_FLAG_RECORD_DB;
 268         if (udata) {
 269                 uctx = rdma_udata_to_drv_context(udata,
 270                                                  struct hns_roce_ucontext,
 271                                                  ibucontext);
 272                 hns_roce_db_unmap_user(uctx, &hr_cq->db);
 273         } else {
 274                 hns_roce_free_db(hr_dev, &hr_cq->db);
 275         }
 276 }
 277
 278 static int verify_cq_create_attr(struct hns_roce_dev *hr_dev,
 279                                  const struct ib_cq_init_attr *attr)
 280 {
 281         struct ib_device *ibdev = &hr_dev->ib_dev;
 282
 283         if (!attr->cqe || attr->cqe > hr_dev->caps.max_cqes) {
 284                 ibdev_err(ibdev, "failed to check CQ count %u, max = %u.\n",
 285                           attr->cqe, hr_dev->caps.max_cqes);
 286                 return -EINVAL;
 287         }
 288
 289         if (attr->comp_vector >= hr_dev->caps.num_comp_vectors) {
 290                 ibdev_err(ibdev, "failed to check CQ vector = %u, max = %d.\n",
 291                           attr->comp_vector, hr_dev->caps.num_comp_vectors);
 292                 return -EINVAL;
 293         }
 294
 295         return 0;
 296 }
 297
 298 static int get_cq_ucmd(struct hns_roce_cq *hr_cq, struct ib_udata *udata,
 299                        struct hns_roce_ib_create_cq *ucmd)
 300 {
 301         struct ib_device *ibdev = hr_cq->ib_cq.device;
 302         int ret;
 303
 304         ret = ib_copy_from_udata(ucmd, udata, min(udata->inlen, sizeof(*ucmd)));
 305         if (ret) {
 306                 ibdev_err(ibdev, "failed to copy CQ udata, ret = %d.\n", ret);
 307                 return ret;
 308         }
 309
 310         return 0;
 311 }
 312
 313 static void set_cq_param(struct hns_roce_cq *hr_cq, u32 cq_entries, int vector,
 314                          struct hns_roce_ib_create_cq *ucmd)
 315 {
 316         struct hns_roce_dev *hr_dev = to_hr_dev(hr_cq->ib_cq.device);
 317
 318         cq_entries = max(cq_entries, hr_dev->caps.min_cqes);
 319         cq_entries = roundup_pow_of_two(cq_entries);
 320         hr_cq->ib_cq.cqe = cq_entries - 1; /* used as cqe index */
 321         hr_cq->cq_depth = cq_entries;
 322         hr_cq->vector = vector;
 323
 324         spin_lock_init(&hr_cq->lock);
 325         INIT_LIST_HEAD(&hr_cq->sq_list);
 326         INIT_LIST_HEAD(&hr_cq->rq_list);
 327 }
 328
 329 static int set_cqe_size(struct hns_roce_cq *hr_cq, struct ib_udata *udata,
 330                         struct hns_roce_ib_create_cq *ucmd)
 331 {
 332         struct hns_roce_dev *hr_dev = to_hr_dev(hr_cq->ib_cq.device);
 333
 334         if (!udata) {
 335                 hr_cq->cqe_size = hr_dev->caps.cqe_sz;
 336                 return 0;
 337         }
 338
 339         if (udata->inlen >= offsetofend(typeof(*ucmd), cqe_size)) {
 340                 if (ucmd->cqe_size != HNS_ROCE_V2_CQE_SIZE &&
 341                     ucmd->cqe_size != HNS_ROCE_V3_CQE_SIZE) {
 342                         ibdev_err(&hr_dev->ib_dev,
 343                                   "invalid cqe size %u.\n", ucmd->cqe_size);
 344                         return -EINVAL;
 345                 }
 346
 347                 hr_cq->cqe_size = ucmd->cqe_size;
 348         } else {
 349                 hr_cq->cqe_size = HNS_ROCE_V2_CQE_SIZE;
 350         }
 351
 352         return 0;
 353 }
 354
 355 int hns_roce_create_cq(struct ib_cq *ib_cq, const struct ib_cq_init_attr *attr,
 356                        struct uverbs_attr_bundle *attrs)
 357 {
 358         struct hns_roce_dev *hr_dev = to_hr_dev(ib_cq->device);
 359         struct ib_udata *udata = &attrs->driver_udata;
 360         struct hns_roce_ib_create_cq_resp resp = {};
 361         struct hns_roce_cq *hr_cq = to_hr_cq(ib_cq);
 362         struct ib_device *ibdev = &hr_dev->ib_dev;
 363         struct hns_roce_ib_create_cq ucmd = {};
 364         int ret;
 365
 366         if (attr->flags) {
 367                 ret = -EOPNOTSUPP;
 368                 goto err_out;
 369         }
 370
 371         ret = verify_cq_create_attr(hr_dev, attr);
 372         if (ret)
 373                 goto err_out;
 374
 375         if (udata) {
 376                 ret = get_cq_ucmd(hr_cq, udata, &ucmd);
 377                 if (ret)
 378                         goto err_out;
 379         }
 380
 381         set_cq_param(hr_cq, attr->cqe, attr->comp_vector, &ucmd);
 382
 383         ret = set_cqe_size(hr_cq, udata, &ucmd);
 384         if (ret)
 385                 goto err_out;
 386
 387         ret = alloc_cq_buf(hr_dev, hr_cq, udata, ucmd.buf_addr);
 388         if (ret) {
 389                 ibdev_err(ibdev, "failed to alloc CQ buf, ret = %d.\n", ret);
 390                 goto err_out;
 391         }
 392
 393         ret = alloc_cq_db(hr_dev, hr_cq, udata, ucmd.db_addr, &resp);
 394         if (ret) {
 395                 ibdev_err(ibdev, "failed to alloc CQ db, ret = %d.\n", ret);
 396                 goto err_cq_buf;
 397         }
 398
 399         ret = alloc_cqn(hr_dev, hr_cq);
 400         if (ret) {
 401                 ibdev_err(ibdev, "failed to alloc CQN, ret = %d.\n", ret);
 402                 goto err_cq_db;
 403         }
 404
 405         ret = alloc_cqc(hr_dev, hr_cq);
 406         if (ret) {
 407                 ibdev_err(ibdev,
 408                           "failed to alloc CQ context, ret = %d.\n", ret);
 409                 goto err_cqn;
 410         }
 411
 412         if (udata) {
 413                 resp.cqn = hr_cq->cqn;
 414                 ret = ib_copy_to_udata(udata, &resp,
 415                                        min(udata->outlen, sizeof(resp)));
 416                 if (ret)
 417                         goto err_cqc;
 418         }
 419
 420         hr_cq->cons_index = 0;
 421         hr_cq->arm_sn = 1;
 422         refcount_set(&hr_cq->refcount, 1);
 423         init_completion(&hr_cq->free);
 424
 425         return 0;
 426
 427 err_cqc:
 428         free_cqc(hr_dev, hr_cq);
 429 err_cqn:
 430         free_cqn(hr_dev, hr_cq->cqn);
 431 err_cq_db:
 432         free_cq_db(hr_dev, hr_cq, udata);
 433 err_cq_buf:
 434         free_cq_buf(hr_dev, hr_cq);
 435 err_out:
 436         atomic64_inc(&hr_dev->dfx_cnt[HNS_ROCE_DFX_CQ_CREATE_ERR_CNT]);
 437
 438         return ret;
 439 }
 440
 441 int hns_roce_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
 442 {
 443         struct hns_roce_dev *hr_dev = to_hr_dev(ib_cq->device);
 444         struct hns_roce_cq *hr_cq = to_hr_cq(ib_cq);
 445
 446         free_cqc(hr_dev, hr_cq);
 447         free_cqn(hr_dev, hr_cq->cqn);
 448         free_cq_db(hr_dev, hr_cq, udata);
 449         free_cq_buf(hr_dev, hr_cq);
 450
 451         return 0;
 452 }
 453
 454 void hns_roce_cq_completion(struct hns_roce_dev *hr_dev, u32 cqn)
 455 {
 456         struct hns_roce_cq *hr_cq;
 457         struct ib_cq *ibcq;
 458
 459         hr_cq = xa_load(&hr_dev->cq_table.array,
 460                         cqn & (hr_dev->caps.num_cqs - 1));
 461         if (!hr_cq) {
 462                 dev_warn(hr_dev->dev, "completion event for bogus CQ 0x%06x\n",
 463                          cqn);
 464                 return;
 465         }
 466
 467         ++hr_cq->arm_sn;
 468         ibcq = &hr_cq->ib_cq;
 469         if (ibcq->comp_handler)
 470                 ibcq->comp_handler(ibcq, ibcq->cq_context);
 471 }
 472
 473 void hns_roce_cq_event(struct hns_roce_dev *hr_dev, u32 cqn, int event_type)
 474 {
 475         struct device *dev = hr_dev->dev;
 476         struct hns_roce_cq *hr_cq;
 477         struct ib_event event;
 478         struct ib_cq *ibcq;
 479
 480         if (event_type != HNS_ROCE_EVENT_TYPE_CQ_ID_INVALID &&
 481             event_type != HNS_ROCE_EVENT_TYPE_CQ_ACCESS_ERROR &&
 482             event_type != HNS_ROCE_EVENT_TYPE_CQ_OVERFLOW) {
 483                 dev_err(dev, "unexpected event type 0x%x on CQ 0x%06x\n",
 484                         event_type, cqn);
 485                 return;
 486         }
 487
 488         xa_lock(&hr_dev->cq_table.array);
 489         hr_cq = xa_load(&hr_dev->cq_table.array,
 490                         cqn & (hr_dev->caps.num_cqs - 1));
 491         if (hr_cq)
 492                 refcount_inc(&hr_cq->refcount);
 493         xa_unlock(&hr_dev->cq_table.array);
 494         if (!hr_cq) {
 495                 dev_warn(dev, "async event for bogus CQ 0x%06x\n", cqn);
 496                 return;
 497         }
 498
 499         ibcq = &hr_cq->ib_cq;
 500         if (ibcq->event_handler) {
 501                 event.device = ibcq->device;
 502                 event.element.cq = ibcq;
 503                 event.event = IB_EVENT_CQ_ERR;
 504                 ibcq->event_handler(&event, ibcq->cq_context);
 505         }
 506
 507         if (refcount_dec_and_test(&hr_cq->refcount))
 508                 complete(&hr_cq->free);
 509 }
 510
 511 void hns_roce_init_cq_table(struct hns_roce_dev *hr_dev)
 512 {
 513         struct hns_roce_cq_table *cq_table = &hr_dev->cq_table;
 514         unsigned int reserved_from_bot;
 515         unsigned int i;
 516
 517         mutex_init(&cq_table->bank_mutex);
 518         xa_init(&cq_table->array);
 519
 520         reserved_from_bot = hr_dev->caps.reserved_cqs;
 521
 522         for (i = 0; i < reserved_from_bot; i++) {
 523                 cq_table->bank[get_cq_bankid(i)].inuse++;
 524                 cq_table->bank[get_cq_bankid(i)].min++;
 525         }
 526
 527         for (i = 0; i < HNS_ROCE_CQ_BANK_NUM; i++) {
 528                 ida_init(&cq_table->bank[i].ida);
 529                 cq_table->bank[i].max = hr_dev->caps.num_cqs /
 530                                         HNS_ROCE_CQ_BANK_NUM - 1;
 531         }
 532 }
 533
 534 void hns_roce_cleanup_cq_table(struct hns_roce_dev *hr_dev)
 535 {
 536         int i;
 537
 538         for (i = 0; i < HNS_ROCE_CQ_BANK_NUM; i++)
 539                 ida_destroy(&hr_dev->cq_table.bank[i].ida);
 540         mutex_destroy(&hr_dev->cq_table.bank_mutex);
 541 }