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->pdev->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 = NULL;
  89         struct hns_roce_cq_table *cq_table = NULL;
  90         struct device *dev = &hr_dev->pdev->dev;
  91         dma_addr_t dma_handle;
  92         u64 *mtts = NULL;
  93         int ret = 0;
  94
  95         cq_table = &hr_dev->cq_table;
  96
  97         /* Get the physical address of cq buf */
  98         mtts = hns_roce_table_find(&hr_dev->mr_table.mtt_table,
  99                                    hr_mtt->first_seg, &dma_handle);
 100         if (!mtts) {
 101                 dev_err(dev, "CQ alloc.Failed to find cq buf addr.\n");
 102                 return -EINVAL;
 103         }
 104
 105         if (vector >= hr_dev->caps.num_comp_vectors) {
 106                 dev_err(dev, "CQ alloc.Invalid vector.\n");
 107                 return -EINVAL;
 108         }
 109         hr_cq->vector = vector;
 110
 111         ret = hns_roce_bitmap_alloc(&cq_table->bitmap, &hr_cq->cqn);
 112         if (ret == -1) {
 113                 dev_err(dev, "CQ alloc.Failed to alloc index.\n");
 114                 return -ENOMEM;
 115         }
 116
 117         /* Get CQC memory HEM(Hardware Entry Memory) table */
 118         ret = hns_roce_table_get(hr_dev, &cq_table->table, hr_cq->cqn);
 119         if (ret) {
 120                 dev_err(dev, "CQ alloc.Failed to get context mem.\n");
 121                 goto err_out;
 122         }
 123
 124         /* The cq insert radix tree */
 125         spin_lock_irq(&cq_table->lock);
 126         /* Radix_tree: The associated pointer and long integer key value like */
 127         ret = radix_tree_insert(&cq_table->tree, hr_cq->cqn, hr_cq);
 128         spin_unlock_irq(&cq_table->lock);
 129         if (ret) {
 130                 dev_err(dev, "CQ alloc.Failed to radix_tree_insert.\n");
 131                 goto err_put;
 132         }
 133
 134         /* Allocate mailbox memory */
 135         mailbox = hns_roce_alloc_cmd_mailbox(hr_dev);
 136         if (IS_ERR(mailbox)) {
 137                 ret = PTR_ERR(mailbox);
 138                 goto err_radix;
 139         }
 140
 141         hr_dev->hw->write_cqc(hr_dev, hr_cq, mailbox->buf, mtts, dma_handle,
 142                               nent, vector);
 143
 144         /* Send mailbox to hw */
 145         ret = hns_roce_sw2hw_cq(hr_dev, mailbox, hr_cq->cqn);
 146         hns_roce_free_cmd_mailbox(hr_dev, mailbox);
 147         if (ret) {
 148                 dev_err(dev, "CQ alloc.Failed to cmd mailbox.\n");
 149                 goto err_radix;
 150         }
 151
 152         hr_cq->cons_index = 0;
 153         hr_cq->uar = hr_uar;
 154
 155         atomic_set(&hr_cq->refcount, 1);
 156         init_completion(&hr_cq->free);
 157
 158         return 0;
 159
 160 err_radix:
 161         spin_lock_irq(&cq_table->lock);
 162         radix_tree_delete(&cq_table->tree, hr_cq->cqn);
 163         spin_unlock_irq(&cq_table->lock);
 164
 165 err_put:
 166         hns_roce_table_put(hr_dev, &cq_table->table, hr_cq->cqn);
 167
 168 err_out:
 169         hns_roce_bitmap_free(&cq_table->bitmap, hr_cq->cqn, BITMAP_NO_RR);
 170         return ret;
 171 }
 172
 173 static int hns_roce_hw2sw_cq(struct hns_roce_dev *dev,
 174                              struct hns_roce_cmd_mailbox *mailbox,
 175                              unsigned long cq_num)
 176 {
 177         return hns_roce_cmd_mbox(dev, 0, mailbox ? mailbox->dma : 0, cq_num,
 178                                  mailbox ? 0 : 1, HNS_ROCE_CMD_HW2SW_CQ,
 179                                  HNS_ROCE_CMD_TIMEOUT_MSECS);
 180 }
 181
 182 void hns_roce_free_cq(struct hns_roce_dev *hr_dev, struct hns_roce_cq *hr_cq)
 183 {
 184         struct hns_roce_cq_table *cq_table = &hr_dev->cq_table;
 185         struct device *dev = &hr_dev->pdev->dev;
 186         int ret;
 187
 188         ret = hns_roce_hw2sw_cq(hr_dev, NULL, hr_cq->cqn);
 189         if (ret)
 190                 dev_err(dev, "HW2SW_CQ failed (%d) for CQN %06lx\n", ret,
 191                         hr_cq->cqn);
 192
 193         /* Waiting interrupt process procedure carried out */
 194         synchronize_irq(hr_dev->eq_table.eq[hr_cq->vector].irq);
 195
 196         /* wait for all interrupt processed */
 197         if (atomic_dec_and_test(&hr_cq->refcount))
 198                 complete(&hr_cq->free);
 199         wait_for_completion(&hr_cq->free);
 200
 201         spin_lock_irq(&cq_table->lock);
 202         radix_tree_delete(&cq_table->tree, hr_cq->cqn);
 203         spin_unlock_irq(&cq_table->lock);
 204
 205         hns_roce_table_put(hr_dev, &cq_table->table, hr_cq->cqn);
 206         hns_roce_bitmap_free(&cq_table->bitmap, hr_cq->cqn, BITMAP_NO_RR);
 207 }
 208
 209 static int hns_roce_ib_get_cq_umem(struct hns_roce_dev *hr_dev,
 210                                    struct ib_ucontext *context,
 211                                    struct hns_roce_cq_buf *buf,
 212                                    struct ib_umem **umem, u64 buf_addr, int cqe)
 213 {
 214         int ret;
 215
 216         *umem = ib_umem_get(context, buf_addr, cqe * hr_dev->caps.cq_entry_sz,
 217                             IB_ACCESS_LOCAL_WRITE, 1);
 218         if (IS_ERR(*umem))
 219                 return PTR_ERR(*umem);
 220
 221         ret = hns_roce_mtt_init(hr_dev, ib_umem_page_count(*umem),
 222                                 (*umem)->page_shift, &buf->hr_mtt);
 223         if (ret)
 224                 goto err_buf;
 225
 226         ret = hns_roce_ib_umem_write_mtt(hr_dev, &buf->hr_mtt, *umem);
 227         if (ret)
 228                 goto err_mtt;
 229
 230         return 0;
 231
 232 err_mtt:
 233         hns_roce_mtt_cleanup(hr_dev, &buf->hr_mtt);
 234
 235 err_buf:
 236         ib_umem_release(*umem);
 237         return ret;
 238 }
 239
 240 static int hns_roce_ib_alloc_cq_buf(struct hns_roce_dev *hr_dev,
 241                                     struct hns_roce_cq_buf *buf, u32 nent)
 242 {
 243         int ret;
 244
 245         ret = hns_roce_buf_alloc(hr_dev, nent * hr_dev->caps.cq_entry_sz,
 246                                  PAGE_SIZE * 2, &buf->hr_buf);
 247         if (ret)
 248                 goto out;
 249
 250         ret = hns_roce_mtt_init(hr_dev, buf->hr_buf.npages,
 251                                 buf->hr_buf.page_shift, &buf->hr_mtt);
 252         if (ret)
 253                 goto err_buf;
 254
 255         ret = hns_roce_buf_write_mtt(hr_dev, &buf->hr_mtt, &buf->hr_buf);
 256         if (ret)
 257                 goto err_mtt;
 258
 259         return 0;
 260
 261 err_mtt:
 262         hns_roce_mtt_cleanup(hr_dev, &buf->hr_mtt);
 263
 264 err_buf:
 265         hns_roce_buf_free(hr_dev, nent * hr_dev->caps.cq_entry_sz,
 266                           &buf->hr_buf);
 267 out:
 268         return ret;
 269 }
 270
 271 static void hns_roce_ib_free_cq_buf(struct hns_roce_dev *hr_dev,
 272                                     struct hns_roce_cq_buf *buf, int cqe)
 273 {
 274         hns_roce_buf_free(hr_dev, (cqe + 1) * hr_dev->caps.cq_entry_sz,
 275                           &buf->hr_buf);
 276 }
 277
 278 struct ib_cq *hns_roce_ib_create_cq(struct ib_device *ib_dev,
 279                                     const struct ib_cq_init_attr *attr,
 280                                     struct ib_ucontext *context,
 281                                     struct ib_udata *udata)
 282 {
 283         struct hns_roce_dev *hr_dev = to_hr_dev(ib_dev);
 284         struct device *dev = &hr_dev->pdev->dev;
 285         struct hns_roce_ib_create_cq ucmd;
 286         struct hns_roce_cq *hr_cq = NULL;
 287         struct hns_roce_uar *uar = NULL;
 288         int vector = attr->comp_vector;
 289         int cq_entries = attr->cqe;
 290         int ret = 0;
 291
 292         if (cq_entries < 1 || cq_entries > hr_dev->caps.max_cqes) {
 293                 dev_err(dev, "Creat CQ failed. entries=%d, max=%d\n",
 294                         cq_entries, hr_dev->caps.max_cqes);
 295                 return ERR_PTR(-EINVAL);
 296         }
 297
 298         hr_cq = kmalloc(sizeof(*hr_cq), GFP_KERNEL);
 299         if (!hr_cq)
 300                 return ERR_PTR(-ENOMEM);
 301
 302         /* In v1 engine, parameter verification */
 303         if (cq_entries < HNS_ROCE_MIN_CQE_NUM)
 304                 cq_entries = HNS_ROCE_MIN_CQE_NUM;
 305
 306         cq_entries = roundup_pow_of_two((unsigned int)cq_entries);
 307         hr_cq->ib_cq.cqe = cq_entries - 1;
 308         spin_lock_init(&hr_cq->lock);
 309
 310         if (context) {
 311                 if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
 312                         dev_err(dev, "Failed to copy_from_udata.\n");
 313                         ret = -EFAULT;
 314                         goto err_cq;
 315                 }
 316
 317                 /* Get user space address, write it into mtt table */
 318                 ret = hns_roce_ib_get_cq_umem(hr_dev, context, &hr_cq->hr_buf,
 319                                               &hr_cq->umem, ucmd.buf_addr,
 320                                               cq_entries);
 321                 if (ret) {
 322                         dev_err(dev, "Failed to get_cq_umem.\n");
 323                         goto err_cq;
 324                 }
 325
 326                 /* Get user space parameters */
 327                 uar = &to_hr_ucontext(context)->uar;
 328         } else {
 329                 /* Init mmt table and write buff address to mtt table */
 330                 ret = hns_roce_ib_alloc_cq_buf(hr_dev, &hr_cq->hr_buf,
 331                                                cq_entries);
 332                 if (ret) {
 333                         dev_err(dev, "Failed to alloc_cq_buf.\n");
 334                         goto err_cq;
 335                 }
 336
 337                 uar = &hr_dev->priv_uar;
 338                 hr_cq->cq_db_l = hr_dev->reg_base + ROCEE_DB_OTHERS_L_0_REG +
 339                                  0x1000 * uar->index;
 340         }
 341
 342         /* Allocate cq index, fill cq_context */
 343         ret = hns_roce_cq_alloc(hr_dev, cq_entries, &hr_cq->hr_buf.hr_mtt, uar,
 344                                 hr_cq, vector);
 345         if (ret) {
 346                 dev_err(dev, "Creat CQ .Failed to cq_alloc.\n");
 347                 goto err_mtt;
 348         }
 349
 350         /*
 351          * For the QP created by kernel space, tptr value should be initialized
 352          * to zero; For the QP created by user space, it will cause synchronous
 353          * problems if tptr is set to zero here, so we initialze it in user
 354          * space.
 355          */
 356         if (!context)
 357                 *hr_cq->tptr_addr = 0;
 358
 359         /* Get created cq handler and carry out event */
 360         hr_cq->comp = hns_roce_ib_cq_comp;
 361         hr_cq->event = hns_roce_ib_cq_event;
 362         hr_cq->cq_depth = cq_entries;
 363
 364         if (context) {
 365                 if (ib_copy_to_udata(udata, &hr_cq->cqn, sizeof(u64))) {
 366                         ret = -EFAULT;
 367                         goto err_cqc;
 368                 }
 369         }
 370
 371         return &hr_cq->ib_cq;
 372
 373 err_cqc:
 374         hns_roce_free_cq(hr_dev, hr_cq);
 375
 376 err_mtt:
 377         hns_roce_mtt_cleanup(hr_dev, &hr_cq->hr_buf.hr_mtt);
 378         if (context)
 379                 ib_umem_release(hr_cq->umem);
 380         else
 381                 hns_roce_ib_free_cq_buf(hr_dev, &hr_cq->hr_buf,
 382                                         hr_cq->ib_cq.cqe);
 383
 384 err_cq:
 385         kfree(hr_cq);
 386         return ERR_PTR(ret);
 387 }
 388
 389 int hns_roce_ib_destroy_cq(struct ib_cq *ib_cq)
 390 {
 391         struct hns_roce_dev *hr_dev = to_hr_dev(ib_cq->device);
 392         struct hns_roce_cq *hr_cq = to_hr_cq(ib_cq);
 393         int ret = 0;
 394
 395         if (hr_dev->hw->destroy_cq) {
 396                 ret = hr_dev->hw->destroy_cq(ib_cq);
 397         } else {
 398                 hns_roce_free_cq(hr_dev, hr_cq);
 399                 hns_roce_mtt_cleanup(hr_dev, &hr_cq->hr_buf.hr_mtt);
 400
 401                 if (ib_cq->uobject)
 402                         ib_umem_release(hr_cq->umem);
 403                 else
 404                         /* Free the buff of stored cq */
 405                         hns_roce_ib_free_cq_buf(hr_dev, &hr_cq->hr_buf,
 406                                                 ib_cq->cqe);
 407
 408                 kfree(hr_cq);
 409         }
 410
 411         return ret;
 412 }
 413
 414 void hns_roce_cq_completion(struct hns_roce_dev *hr_dev, u32 cqn)
 415 {
 416         struct device *dev = &hr_dev->pdev->dev;
 417         struct hns_roce_cq *cq;
 418
 419         cq = radix_tree_lookup(&hr_dev->cq_table.tree,
 420                                cqn & (hr_dev->caps.num_cqs - 1));
 421         if (!cq) {
 422                 dev_warn(dev, "Completion event for bogus CQ 0x%08x\n", cqn);
 423                 return;
 424         }
 425
 426         cq->comp(cq);
 427 }
 428
 429 void hns_roce_cq_event(struct hns_roce_dev *hr_dev, u32 cqn, int event_type)
 430 {
 431         struct hns_roce_cq_table *cq_table = &hr_dev->cq_table;
 432         struct device *dev = &hr_dev->pdev->dev;
 433         struct hns_roce_cq *cq;
 434
 435         cq = radix_tree_lookup(&cq_table->tree,
 436                                cqn & (hr_dev->caps.num_cqs - 1));
 437         if (cq)
 438                 atomic_inc(&cq->refcount);
 439
 440         if (!cq) {
 441                 dev_warn(dev, "Async event for bogus CQ %08x\n", cqn);
 442                 return;
 443         }
 444
 445         cq->event(cq, (enum hns_roce_event)event_type);
 446
 447         if (atomic_dec_and_test(&cq->refcount))
 448                 complete(&cq->free);
 449 }
 450
 451 int hns_roce_init_cq_table(struct hns_roce_dev *hr_dev)
 452 {
 453         struct hns_roce_cq_table *cq_table = &hr_dev->cq_table;
 454
 455         spin_lock_init(&cq_table->lock);
 456         INIT_RADIX_TREE(&cq_table->tree, GFP_ATOMIC);
 457
 458         return hns_roce_bitmap_init(&cq_table->bitmap, hr_dev->caps.num_cqs,
 459                                     hr_dev->caps.num_cqs - 1,
 460                                     hr_dev->caps.reserved_cqs, 0);
 461 }
 462
 463 void hns_roce_cleanup_cq_table(struct hns_roce_dev *hr_dev)
 464 {
 465         hns_roce_bitmap_cleanup(&hr_dev->cq_table.bitmap);
 466 }