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 <linux/platform_device.h>
  34 #include <rdma/ib_umem.h>
  35 #include "hns_roce_device.h"
  36 #include "hns_roce_cmd.h"
  37 #include "hns_roce_hem.h"
  38 #include <rdma/hns-abi.h>
  39 #include "hns_roce_common.h"
  40
  41 static void hns_roce_ib_cq_comp(struct hns_roce_cq *hr_cq)
  42 {
  43         struct ib_cq *ibcq = &hr_cq->ib_cq;
  44
  45         ibcq->comp_handler(ibcq, ibcq->cq_context);
  46 }
  47
  48 static void hns_roce_ib_cq_event(struct hns_roce_cq *hr_cq,
  49                                  enum hns_roce_event event_type)
  50 {
  51         struct hns_roce_dev *hr_dev;
  52         struct ib_event event;
  53         struct ib_cq *ibcq;
  54
  55         ibcq = &hr_cq->ib_cq;
  56         hr_dev = to_hr_dev(ibcq->device);
  57
  58         if (event_type != HNS_ROCE_EVENT_TYPE_CQ_ID_INVALID &&
  59             event_type != HNS_ROCE_EVENT_TYPE_CQ_ACCESS_ERROR &&
  60             event_type != HNS_ROCE_EVENT_TYPE_CQ_OVERFLOW) {
  61                 dev_err(hr_dev->dev,
  62                         "hns_roce_ib: Unexpected event type 0x%x on CQ %06lx\n",
  63                         event_type, hr_cq->cqn);
  64                 return;
  65         }
  66
  67         if (ibcq->event_handler) {
  68                 event.device = ibcq->device;
  69                 event.event = IB_EVENT_CQ_ERR;
  70                 event.element.cq = ibcq;
  71                 ibcq->event_handler(&event, ibcq->cq_context);
  72         }
  73 }
  74
  75 static int hns_roce_sw2hw_cq(struct hns_roce_dev *dev,
  76                              struct hns_roce_cmd_mailbox *mailbox,
  77                              unsigned long cq_num)
  78 {
  79         return hns_roce_cmd_mbox(dev, mailbox->dma, 0, cq_num, 0,
  80                             HNS_ROCE_CMD_SW2HW_CQ, HNS_ROCE_CMD_TIMEOUT_MSECS);
  81 }
  82
  83 static int hns_roce_cq_alloc(struct hns_roce_dev *hr_dev, int nent,
  84                              struct hns_roce_mtt *hr_mtt,
  85                              struct hns_roce_uar *hr_uar,
  86                              struct hns_roce_cq *hr_cq, int vector)
  87 {
  88         struct hns_roce_cmd_mailbox *mailbox;
  89         struct hns_roce_hem_table *mtt_table;
  90         struct hns_roce_cq_table *cq_table;
  91         struct device *dev = hr_dev->dev;
  92         dma_addr_t dma_handle;
  93         u64 *mtts;
  94         int ret;
  95
  96         cq_table = &hr_dev->cq_table;
  97
  98         /* Get the physical address of cq buf */
  99         if (hns_roce_check_whether_mhop(hr_dev, HEM_TYPE_CQE))
 100                 mtt_table = &hr_dev->mr_table.mtt_cqe_table;
 101         else
 102                 mtt_table = &hr_dev->mr_table.mtt_table;
 103
 104         mtts = hns_roce_table_find(hr_dev, mtt_table,
 105                                    hr_mtt->first_seg, &dma_handle);
 106         if (!mtts) {
 107                 dev_err(dev, "CQ alloc.Failed to find cq buf addr.\n");
 108                 return -EINVAL;
 109         }
 110
 111         if (vector >= hr_dev->caps.num_comp_vectors) {
 112                 dev_err(dev, "CQ alloc.Invalid vector.\n");
 113                 return -EINVAL;
 114         }
 115         hr_cq->vector = vector;
 116
 117         ret = hns_roce_bitmap_alloc(&cq_table->bitmap, &hr_cq->cqn);
 118         if (ret == -1) {
 119                 dev_err(dev, "CQ alloc.Failed to alloc index.\n");
 120                 return -ENOMEM;
 121         }
 122
 123         /* Get CQC memory HEM(Hardware Entry Memory) table */
 124         ret = hns_roce_table_get(hr_dev, &cq_table->table, hr_cq->cqn);
 125         if (ret) {
 126                 dev_err(dev, "CQ alloc.Failed to get context mem.\n");
 127                 goto err_out;
 128         }
 129
 130         /* The cq insert radix tree */
 131         spin_lock_irq(&cq_table->lock);
 132         /* Radix_tree: The associated pointer and long integer key value like */
 133         ret = radix_tree_insert(&cq_table->tree, hr_cq->cqn, hr_cq);
 134         spin_unlock_irq(&cq_table->lock);
 135         if (ret) {
 136                 dev_err(dev, "CQ alloc.Failed to radix_tree_insert.\n");
 137                 goto err_put;
 138         }
 139
 140         /* Allocate mailbox memory */
 141         mailbox = hns_roce_alloc_cmd_mailbox(hr_dev);
 142         if (IS_ERR(mailbox)) {
 143                 ret = PTR_ERR(mailbox);
 144                 goto err_radix;
 145         }
 146
 147         hr_dev->hw->write_cqc(hr_dev, hr_cq, mailbox->buf, mtts, dma_handle,
 148                               nent, vector);
 149
 150         /* Send mailbox to hw */
 151         ret = hns_roce_sw2hw_cq(hr_dev, mailbox, hr_cq->cqn);
 152         hns_roce_free_cmd_mailbox(hr_dev, mailbox);
 153         if (ret) {
 154                 dev_err(dev, "CQ alloc.Failed to cmd mailbox.\n");
 155                 goto err_radix;
 156         }
 157
 158         hr_cq->cons_index = 0;
 159         hr_cq->arm_sn = 1;
 160         hr_cq->uar = hr_uar;
 161
 162         atomic_set(&hr_cq->refcount, 1);
 163         init_completion(&hr_cq->free);
 164
 165         return 0;
 166
 167 err_radix:
 168         spin_lock_irq(&cq_table->lock);
 169         radix_tree_delete(&cq_table->tree, hr_cq->cqn);
 170         spin_unlock_irq(&cq_table->lock);
 171
 172 err_put:
 173         hns_roce_table_put(hr_dev, &cq_table->table, hr_cq->cqn);
 174
 175 err_out:
 176         hns_roce_bitmap_free(&cq_table->bitmap, hr_cq->cqn, BITMAP_NO_RR);
 177         return ret;
 178 }
 179
 180 static int hns_roce_hw2sw_cq(struct hns_roce_dev *dev,
 181                              struct hns_roce_cmd_mailbox *mailbox,
 182                              unsigned long cq_num)
 183 {
 184         return hns_roce_cmd_mbox(dev, 0, mailbox ? mailbox->dma : 0, cq_num,
 185                                  mailbox ? 0 : 1, HNS_ROCE_CMD_HW2SW_CQ,
 186                                  HNS_ROCE_CMD_TIMEOUT_MSECS);
 187 }
 188
 189 void hns_roce_free_cq(struct hns_roce_dev *hr_dev, struct hns_roce_cq *hr_cq)
 190 {
 191         struct hns_roce_cq_table *cq_table = &hr_dev->cq_table;
 192         struct device *dev = hr_dev->dev;
 193         int ret;
 194
 195         ret = hns_roce_hw2sw_cq(hr_dev, NULL, hr_cq->cqn);
 196         if (ret)
 197                 dev_err(dev, "HW2SW_CQ failed (%d) for CQN %06lx\n", ret,
 198                         hr_cq->cqn);
 199
 200         /* Waiting interrupt process procedure carried out */
 201         synchronize_irq(hr_dev->eq_table.eq[hr_cq->vector].irq);
 202
 203         /* wait for all interrupt processed */
 204         if (atomic_dec_and_test(&hr_cq->refcount))
 205                 complete(&hr_cq->free);
 206         wait_for_completion(&hr_cq->free);
 207
 208         spin_lock_irq(&cq_table->lock);
 209         radix_tree_delete(&cq_table->tree, hr_cq->cqn);
 210         spin_unlock_irq(&cq_table->lock);
 211
 212         hns_roce_table_put(hr_dev, &cq_table->table, hr_cq->cqn);
 213         hns_roce_bitmap_free(&cq_table->bitmap, hr_cq->cqn, BITMAP_NO_RR);
 214 }
 215 EXPORT_SYMBOL_GPL(hns_roce_free_cq);
 216
 217 static int hns_roce_ib_get_cq_umem(struct hns_roce_dev *hr_dev,
 218                                    struct ib_ucontext *context,
 219                                    struct hns_roce_cq_buf *buf,
 220                                    struct ib_umem **umem, u64 buf_addr, int cqe)
 221 {
 222         int ret;
 223         u32 page_shift;
 224         u32 npages;
 225
 226         *umem = ib_umem_get(context, buf_addr, cqe * hr_dev->caps.cq_entry_sz,
 227                             IB_ACCESS_LOCAL_WRITE, 1);
 228         if (IS_ERR(*umem))
 229                 return PTR_ERR(*umem);
 230
 231         if (hns_roce_check_whether_mhop(hr_dev, HEM_TYPE_CQE))
 232                 buf->hr_mtt.mtt_type = MTT_TYPE_CQE;
 233         else
 234                 buf->hr_mtt.mtt_type = MTT_TYPE_WQE;
 235
 236         if (hr_dev->caps.cqe_buf_pg_sz) {
 237                 npages = (ib_umem_page_count(*umem) +
 238                         (1 << hr_dev->caps.cqe_buf_pg_sz) - 1) /
 239                         (1 << hr_dev->caps.cqe_buf_pg_sz);
 240                 page_shift = PAGE_SHIFT + hr_dev->caps.cqe_buf_pg_sz;
 241                 ret = hns_roce_mtt_init(hr_dev, npages, page_shift,
 242                                         &buf->hr_mtt);
 243         } else {
 244                 ret = hns_roce_mtt_init(hr_dev, ib_umem_page_count(*umem),
 245                                 (*umem)->page_shift,
 246                                 &buf->hr_mtt);
 247         }
 248         if (ret)
 249                 goto err_buf;
 250
 251         ret = hns_roce_ib_umem_write_mtt(hr_dev, &buf->hr_mtt, *umem);
 252         if (ret)
 253                 goto err_mtt;
 254
 255         return 0;
 256
 257 err_mtt:
 258         hns_roce_mtt_cleanup(hr_dev, &buf->hr_mtt);
 259
 260 err_buf:
 261         ib_umem_release(*umem);
 262         return ret;
 263 }
 264
 265 static int hns_roce_ib_alloc_cq_buf(struct hns_roce_dev *hr_dev,
 266                                     struct hns_roce_cq_buf *buf, u32 nent)
 267 {
 268         int ret;
 269         u32 page_shift = PAGE_SHIFT + hr_dev->caps.cqe_buf_pg_sz;
 270
 271         ret = hns_roce_buf_alloc(hr_dev, nent * hr_dev->caps.cq_entry_sz,
 272                                  (1 << page_shift) * 2, &buf->hr_buf,
 273                                  page_shift);
 274         if (ret)
 275                 goto out;
 276
 277         if (hns_roce_check_whether_mhop(hr_dev, HEM_TYPE_CQE))
 278                 buf->hr_mtt.mtt_type = MTT_TYPE_CQE;
 279         else
 280                 buf->hr_mtt.mtt_type = MTT_TYPE_WQE;
 281
 282         ret = hns_roce_mtt_init(hr_dev, buf->hr_buf.npages,
 283                                 buf->hr_buf.page_shift, &buf->hr_mtt);
 284         if (ret)
 285                 goto err_buf;
 286
 287         ret = hns_roce_buf_write_mtt(hr_dev, &buf->hr_mtt, &buf->hr_buf);
 288         if (ret)
 289                 goto err_mtt;
 290
 291         return 0;
 292
 293 err_mtt:
 294         hns_roce_mtt_cleanup(hr_dev, &buf->hr_mtt);
 295
 296 err_buf:
 297         hns_roce_buf_free(hr_dev, nent * hr_dev->caps.cq_entry_sz,
 298                           &buf->hr_buf);
 299 out:
 300         return ret;
 301 }
 302
 303 static void hns_roce_ib_free_cq_buf(struct hns_roce_dev *hr_dev,
 304                                     struct hns_roce_cq_buf *buf, int cqe)
 305 {
 306         hns_roce_buf_free(hr_dev, (cqe + 1) * hr_dev->caps.cq_entry_sz,
 307                           &buf->hr_buf);
 308 }
 309
 310 struct ib_cq *hns_roce_ib_create_cq(struct ib_device *ib_dev,
 311                                     const struct ib_cq_init_attr *attr,
 312                                     struct ib_ucontext *context,
 313                                     struct ib_udata *udata)
 314 {
 315         struct hns_roce_dev *hr_dev = to_hr_dev(ib_dev);
 316         struct device *dev = hr_dev->dev;
 317         struct hns_roce_ib_create_cq ucmd;
 318         struct hns_roce_ib_create_cq_resp resp = {};
 319         struct hns_roce_cq *hr_cq = NULL;
 320         struct hns_roce_uar *uar = NULL;
 321         int vector = attr->comp_vector;
 322         int cq_entries = attr->cqe;
 323         int ret;
 324
 325         if (cq_entries < 1 || cq_entries > hr_dev->caps.max_cqes) {
 326                 dev_err(dev, "Creat CQ failed. entries=%d, max=%d\n",
 327                         cq_entries, hr_dev->caps.max_cqes);
 328                 return ERR_PTR(-EINVAL);
 329         }
 330
 331         hr_cq = kzalloc(sizeof(*hr_cq), GFP_KERNEL);
 332         if (!hr_cq)
 333                 return ERR_PTR(-ENOMEM);
 334
 335         if (hr_dev->caps.min_cqes)
 336                 cq_entries = max(cq_entries, hr_dev->caps.min_cqes);
 337
 338         cq_entries = roundup_pow_of_two((unsigned int)cq_entries);
 339         hr_cq->ib_cq.cqe = cq_entries - 1;
 340         spin_lock_init(&hr_cq->lock);
 341
 342         if (context) {
 343                 if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
 344                         dev_err(dev, "Failed to copy_from_udata.\n");
 345                         ret = -EFAULT;
 346                         goto err_cq;
 347                 }
 348
 349                 /* Get user space address, write it into mtt table */
 350                 ret = hns_roce_ib_get_cq_umem(hr_dev, context, &hr_cq->hr_buf,
 351                                               &hr_cq->umem, ucmd.buf_addr,
 352                                               cq_entries);
 353                 if (ret) {
 354                         dev_err(dev, "Failed to get_cq_umem.\n");
 355                         goto err_cq;
 356                 }
 357
 358                 if ((hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_RECORD_DB) &&
 359                     (udata->outlen >= sizeof(resp))) {
 360                         ret = hns_roce_db_map_user(to_hr_ucontext(context),
 361                                                    ucmd.db_addr, &hr_cq->db);
 362                         if (ret) {
 363                                 dev_err(dev, "cq record doorbell map failed!\n");
 364                                 goto err_mtt;
 365                         }
 366                         hr_cq->db_en = 1;
 367                         resp.cap_flags |= HNS_ROCE_SUPPORT_CQ_RECORD_DB;
 368                 }
 369
 370                 /* Get user space parameters */
 371                 uar = &to_hr_ucontext(context)->uar;
 372         } else {
 373                 if (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_RECORD_DB) {
 374                         ret = hns_roce_alloc_db(hr_dev, &hr_cq->db, 1);
 375                         if (ret)
 376                                 goto err_cq;
 377
 378                         hr_cq->set_ci_db = hr_cq->db.db_record;
 379                         *hr_cq->set_ci_db = 0;
 380                         hr_cq->db_en = 1;
 381                 }
 382
 383                 /* Init mmt table and write buff address to mtt table */
 384                 ret = hns_roce_ib_alloc_cq_buf(hr_dev, &hr_cq->hr_buf,
 385                                                cq_entries);
 386                 if (ret) {
 387                         dev_err(dev, "Failed to alloc_cq_buf.\n");
 388                         goto err_db;
 389                 }
 390
 391                 uar = &hr_dev->priv_uar;
 392                 hr_cq->cq_db_l = hr_dev->reg_base + hr_dev->odb_offset +
 393                                 DB_REG_OFFSET * uar->index;
 394         }
 395
 396         /* Allocate cq index, fill cq_context */
 397         ret = hns_roce_cq_alloc(hr_dev, cq_entries, &hr_cq->hr_buf.hr_mtt, uar,
 398                                 hr_cq, vector);
 399         if (ret) {
 400                 dev_err(dev, "Creat CQ .Failed to cq_alloc.\n");
 401                 goto err_dbmap;
 402         }
 403
 404         /*
 405          * For the QP created by kernel space, tptr value should be initialized
 406          * to zero; For the QP created by user space, it will cause synchronous
 407          * problems if tptr is set to zero here, so we initialze it in user
 408          * space.
 409          */
 410         if (!context && hr_cq->tptr_addr)
 411                 *hr_cq->tptr_addr = 0;
 412
 413         /* Get created cq handler and carry out event */
 414         hr_cq->comp = hns_roce_ib_cq_comp;
 415         hr_cq->event = hns_roce_ib_cq_event;
 416         hr_cq->cq_depth = cq_entries;
 417
 418         if (context) {
 419                 resp.cqn = hr_cq->cqn;
 420                 ret = ib_copy_to_udata(udata, &resp, sizeof(resp));
 421                 if (ret)
 422                         goto err_cqc;
 423         }
 424
 425         return &hr_cq->ib_cq;
 426
 427 err_cqc:
 428         hns_roce_free_cq(hr_dev, hr_cq);
 429
 430 err_dbmap:
 431         if (context && (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_RECORD_DB) &&
 432             (udata->outlen >= sizeof(resp)))
 433                 hns_roce_db_unmap_user(to_hr_ucontext(context),
 434                                        &hr_cq->db);
 435
 436 err_mtt:
 437         hns_roce_mtt_cleanup(hr_dev, &hr_cq->hr_buf.hr_mtt);
 438         if (context)
 439                 ib_umem_release(hr_cq->umem);
 440         else
 441                 hns_roce_ib_free_cq_buf(hr_dev, &hr_cq->hr_buf,
 442                                         hr_cq->ib_cq.cqe);
 443
 444 err_db:
 445         if (!context && (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_RECORD_DB))
 446                 hns_roce_free_db(hr_dev, &hr_cq->db);
 447
 448 err_cq:
 449         kfree(hr_cq);
 450         return ERR_PTR(ret);
 451 }
 452 EXPORT_SYMBOL_GPL(hns_roce_ib_create_cq);
 453
 454 int hns_roce_ib_destroy_cq(struct ib_cq *ib_cq)
 455 {
 456         struct hns_roce_dev *hr_dev = to_hr_dev(ib_cq->device);
 457         struct hns_roce_cq *hr_cq = to_hr_cq(ib_cq);
 458         int ret = 0;
 459
 460         if (hr_dev->hw->destroy_cq) {
 461                 ret = hr_dev->hw->destroy_cq(ib_cq);
 462         } else {
 463                 hns_roce_free_cq(hr_dev, hr_cq);
 464                 hns_roce_mtt_cleanup(hr_dev, &hr_cq->hr_buf.hr_mtt);
 465
 466                 if (ib_cq->uobject) {
 467                         ib_umem_release(hr_cq->umem);
 468
 469                         if (hr_cq->db_en == 1)
 470                                 hns_roce_db_unmap_user(
 471                                         to_hr_ucontext(ib_cq->uobject->context),
 472                                         &hr_cq->db);
 473                 } else {
 474                         /* Free the buff of stored cq */
 475                         hns_roce_ib_free_cq_buf(hr_dev, &hr_cq->hr_buf,
 476                                                 ib_cq->cqe);
 477                         if (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_RECORD_DB)
 478                                 hns_roce_free_db(hr_dev, &hr_cq->db);
 479                 }
 480
 481                 kfree(hr_cq);
 482         }
 483
 484         return ret;
 485 }
 486 EXPORT_SYMBOL_GPL(hns_roce_ib_destroy_cq);
 487
 488 void hns_roce_cq_completion(struct hns_roce_dev *hr_dev, u32 cqn)
 489 {
 490         struct device *dev = hr_dev->dev;
 491         struct hns_roce_cq *cq;
 492
 493         cq = radix_tree_lookup(&hr_dev->cq_table.tree,
 494                                cqn & (hr_dev->caps.num_cqs - 1));
 495         if (!cq) {
 496                 dev_warn(dev, "Completion event for bogus CQ 0x%08x\n", cqn);
 497                 return;
 498         }
 499
 500         ++cq->arm_sn;
 501         cq->comp(cq);
 502 }
 503 EXPORT_SYMBOL_GPL(hns_roce_cq_completion);
 504
 505 void hns_roce_cq_event(struct hns_roce_dev *hr_dev, u32 cqn, int event_type)
 506 {
 507         struct hns_roce_cq_table *cq_table = &hr_dev->cq_table;
 508         struct device *dev = hr_dev->dev;
 509         struct hns_roce_cq *cq;
 510
 511         cq = radix_tree_lookup(&cq_table->tree,
 512                                cqn & (hr_dev->caps.num_cqs - 1));
 513         if (cq)
 514                 atomic_inc(&cq->refcount);
 515
 516         if (!cq) {
 517                 dev_warn(dev, "Async event for bogus CQ %08x\n", cqn);
 518                 return;
 519         }
 520
 521         cq->event(cq, (enum hns_roce_event)event_type);
 522
 523         if (atomic_dec_and_test(&cq->refcount))
 524                 complete(&cq->free);
 525 }
 526 EXPORT_SYMBOL_GPL(hns_roce_cq_event);
 527
 528 int hns_roce_init_cq_table(struct hns_roce_dev *hr_dev)
 529 {
 530         struct hns_roce_cq_table *cq_table = &hr_dev->cq_table;
 531
 532         spin_lock_init(&cq_table->lock);
 533         INIT_RADIX_TREE(&cq_table->tree, GFP_ATOMIC);
 534
 535         return hns_roce_bitmap_init(&cq_table->bitmap, hr_dev->caps.num_cqs,
 536                                     hr_dev->caps.num_cqs - 1,
 537                                     hr_dev->caps.reserved_cqs, 0);
 538 }
 539
 540 void hns_roce_cleanup_cq_table(struct hns_roce_dev *hr_dev)
 541 {
 542         hns_roce_bitmap_cleanup(&hr_dev->cq_table.bitmap);
 543 }