drivers/infiniband/hw/hns/hns_roce_srq.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 /*
   3  * Copyright (c) 2018 Hisilicon Limited.
   4  */
   5
   6 #include <linux/pci.h>
   7 #include <rdma/ib_umem.h>
   8 #include "hns_roce_device.h"
   9 #include "hns_roce_cmd.h"
  10 #include "hns_roce_hem.h"
  11
  12 void hns_roce_srq_event(struct hns_roce_dev *hr_dev, u32 srqn, int event_type)
  13 {
  14         struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
  15         struct hns_roce_srq *srq;
  16
  17         xa_lock(&srq_table->xa);
  18         srq = xa_load(&srq_table->xa, srqn & (hr_dev->caps.num_srqs - 1));
  19         if (srq)
  20                 atomic_inc(&srq->refcount);
  21         xa_unlock(&srq_table->xa);
  22
  23         if (!srq) {
  24                 dev_warn(hr_dev->dev, "Async event for bogus SRQ %08x\n", srqn);
  25                 return;
  26         }
  27
  28         srq->event(srq, event_type);
  29
  30         if (atomic_dec_and_test(&srq->refcount))
  31                 complete(&srq->free);
  32 }
  33
  34 static void hns_roce_ib_srq_event(struct hns_roce_srq *srq,
  35                                   enum hns_roce_event event_type)
  36 {
  37         struct hns_roce_dev *hr_dev = to_hr_dev(srq->ibsrq.device);
  38         struct ib_srq *ibsrq = &srq->ibsrq;
  39         struct ib_event event;
  40
  41         if (ibsrq->event_handler) {
  42                 event.device      = ibsrq->device;
  43                 event.element.srq = ibsrq;
  44                 switch (event_type) {
  45                 case HNS_ROCE_EVENT_TYPE_SRQ_LIMIT_REACH:
  46                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
  47                         break;
  48                 case HNS_ROCE_EVENT_TYPE_SRQ_CATAS_ERROR:
  49                         event.event = IB_EVENT_SRQ_ERR;
  50                         break;
  51                 default:
  52                         dev_err(hr_dev->dev,
  53                            "hns_roce:Unexpected event type 0x%x on SRQ %06lx\n",
  54                            event_type, srq->srqn);
  55                         return;
  56                 }
  57
  58                 ibsrq->event_handler(&event, ibsrq->srq_context);
  59         }
  60 }
  61
  62 static int hns_roce_hw_create_srq(struct hns_roce_dev *dev,
  63                                   struct hns_roce_cmd_mailbox *mailbox,
  64                                   unsigned long srq_num)
  65 {
  66         return hns_roce_cmd_mbox(dev, mailbox->dma, 0, srq_num, 0,
  67                                  HNS_ROCE_CMD_CREATE_SRQ,
  68                                  HNS_ROCE_CMD_TIMEOUT_MSECS);
  69 }
  70
  71 static int hns_roce_hw_destroy_srq(struct hns_roce_dev *dev,
  72                                    struct hns_roce_cmd_mailbox *mailbox,
  73                                    unsigned long srq_num)
  74 {
  75         return hns_roce_cmd_mbox(dev, 0, mailbox ? mailbox->dma : 0, srq_num,
  76                                  mailbox ? 0 : 1, HNS_ROCE_CMD_DESTROY_SRQ,
  77                                  HNS_ROCE_CMD_TIMEOUT_MSECS);
  78 }
  79
  80 static int alloc_srqc(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
  81 {
  82         struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
  83         struct ib_device *ibdev = &hr_dev->ib_dev;
  84         struct hns_roce_cmd_mailbox *mailbox;
  85         int ret;
  86
  87         ret = hns_roce_bitmap_alloc(&srq_table->bitmap, &srq->srqn);
  88         if (ret) {
  89                 ibdev_err(ibdev, "failed to alloc SRQ number.\n");
  90                 return -ENOMEM;
  91         }
  92
  93         ret = hns_roce_table_get(hr_dev, &srq_table->table, srq->srqn);
  94         if (ret) {
  95                 ibdev_err(ibdev, "failed to get SRQC table, ret = %d.\n", ret);
  96                 goto err_out;
  97         }
  98
  99         ret = xa_err(xa_store(&srq_table->xa, srq->srqn, srq, GFP_KERNEL));
 100         if (ret) {
 101                 ibdev_err(ibdev, "failed to store SRQC, ret = %d.\n", ret);
 102                 goto err_put;
 103         }
 104
 105         mailbox = hns_roce_alloc_cmd_mailbox(hr_dev);
 106         if (IS_ERR_OR_NULL(mailbox)) {
 107                 ibdev_err(ibdev, "failed to alloc mailbox for SRQC.\n");
 108                 ret = -ENOMEM;
 109                 goto err_xa;
 110         }
 111
 112         ret = hr_dev->hw->write_srqc(srq, mailbox->buf);
 113         if (ret) {
 114                 ibdev_err(ibdev, "failed to write SRQC.\n");
 115                 goto err_mbox;
 116         }
 117
 118         ret = hns_roce_hw_create_srq(hr_dev, mailbox, srq->srqn);
 119         if (ret) {
 120                 ibdev_err(ibdev, "failed to config SRQC, ret = %d.\n", ret);
 121                 goto err_mbox;
 122         }
 123
 124         hns_roce_free_cmd_mailbox(hr_dev, mailbox);
 125
 126         return 0;
 127
 128 err_mbox:
 129         hns_roce_free_cmd_mailbox(hr_dev, mailbox);
 130 err_xa:
 131         xa_erase(&srq_table->xa, srq->srqn);
 132 err_put:
 133         hns_roce_table_put(hr_dev, &srq_table->table, srq->srqn);
 134 err_out:
 135         hns_roce_bitmap_free(&srq_table->bitmap, srq->srqn, BITMAP_NO_RR);
 136
 137         return ret;
 138 }
 139
 140 static void free_srqc(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
 141 {
 142         struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
 143         int ret;
 144
 145         ret = hns_roce_hw_destroy_srq(hr_dev, NULL, srq->srqn);
 146         if (ret)
 147                 dev_err(hr_dev->dev, "DESTROY_SRQ failed (%d) for SRQN %06lx\n",
 148                         ret, srq->srqn);
 149
 150         xa_erase(&srq_table->xa, srq->srqn);
 151
 152         if (atomic_dec_and_test(&srq->refcount))
 153                 complete(&srq->free);
 154         wait_for_completion(&srq->free);
 155
 156         hns_roce_table_put(hr_dev, &srq_table->table, srq->srqn);
 157         hns_roce_bitmap_free(&srq_table->bitmap, srq->srqn, BITMAP_NO_RR);
 158 }
 159
 160 static int alloc_srq_idx(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq,
 161                          struct ib_udata *udata, unsigned long addr)
 162 {
 163         struct hns_roce_idx_que *idx_que = &srq->idx_que;
 164         struct ib_device *ibdev = &hr_dev->ib_dev;
 165         struct hns_roce_buf_attr buf_attr = {};
 166         int ret;
 167
 168         srq->idx_que.entry_shift = ilog2(HNS_ROCE_IDX_QUE_ENTRY_SZ);
 169
 170         buf_attr.page_shift = hr_dev->caps.idx_buf_pg_sz + HNS_HW_PAGE_SHIFT;
 171         buf_attr.region[0].size = to_hr_hem_entries_size(srq->wqe_cnt,
 172                                         srq->idx_que.entry_shift);
 173         buf_attr.region[0].hopnum = hr_dev->caps.idx_hop_num;
 174         buf_attr.region_count = 1;
 175
 176         ret = hns_roce_mtr_create(hr_dev, &idx_que->mtr, &buf_attr,
 177                                   hr_dev->caps.idx_ba_pg_sz + HNS_HW_PAGE_SHIFT,
 178                                   udata, addr);
 179         if (ret) {
 180                 ibdev_err(ibdev,
 181                           "failed to alloc SRQ idx mtr, ret = %d.\n", ret);
 182                 return ret;
 183         }
 184
 185         if (!udata) {
 186                 idx_que->bitmap = bitmap_zalloc(srq->wqe_cnt, GFP_KERNEL);
 187                 if (!idx_que->bitmap) {
 188                         ibdev_err(ibdev, "failed to alloc SRQ idx bitmap.\n");
 189                         ret = -ENOMEM;
 190                         goto err_idx_mtr;
 191                 }
 192         }
 193
 194         idx_que->head = 0;
 195         idx_que->tail = 0;
 196
 197         return 0;
 198 err_idx_mtr:
 199         hns_roce_mtr_destroy(hr_dev, &idx_que->mtr);
 200
 201         return ret;
 202 }
 203
 204 static void free_srq_idx(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
 205 {
 206         struct hns_roce_idx_que *idx_que = &srq->idx_que;
 207
 208         bitmap_free(idx_que->bitmap);
 209         idx_que->bitmap = NULL;
 210         hns_roce_mtr_destroy(hr_dev, &idx_que->mtr);
 211 }
 212
 213 static int alloc_srq_wqe_buf(struct hns_roce_dev *hr_dev,
 214                              struct hns_roce_srq *srq,
 215                              struct ib_udata *udata, unsigned long addr)
 216 {
 217         struct ib_device *ibdev = &hr_dev->ib_dev;
 218         struct hns_roce_buf_attr buf_attr = {};
 219         int ret;
 220
 221         srq->wqe_shift = ilog2(roundup_pow_of_two(max(HNS_ROCE_SGE_SIZE,
 222                                                       HNS_ROCE_SGE_SIZE *
 223                                                       srq->max_gs)));
 224
 225         buf_attr.page_shift = hr_dev->caps.srqwqe_buf_pg_sz + HNS_HW_PAGE_SHIFT;
 226         buf_attr.region[0].size = to_hr_hem_entries_size(srq->wqe_cnt,
 227                                                          srq->wqe_shift);
 228         buf_attr.region[0].hopnum = hr_dev->caps.srqwqe_hop_num;
 229         buf_attr.region_count = 1;
 230
 231         ret = hns_roce_mtr_create(hr_dev, &srq->buf_mtr, &buf_attr,
 232                                   hr_dev->caps.srqwqe_ba_pg_sz +
 233                                   HNS_HW_PAGE_SHIFT, udata, addr);
 234         if (ret)
 235                 ibdev_err(ibdev,
 236                           "failed to alloc SRQ buf mtr, ret = %d.\n", ret);
 237
 238         return ret;
 239 }
 240
 241 static void free_srq_wqe_buf(struct hns_roce_dev *hr_dev,
 242                              struct hns_roce_srq *srq)
 243 {
 244         hns_roce_mtr_destroy(hr_dev, &srq->buf_mtr);
 245 }
 246
 247 static int alloc_srq_wrid(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
 248 {
 249         srq->wrid = kvmalloc_array(srq->wqe_cnt, sizeof(u64), GFP_KERNEL);
 250         if (!srq->wrid)
 251                 return -ENOMEM;
 252
 253         return 0;
 254 }
 255
 256 static void free_srq_wrid(struct hns_roce_srq *srq)
 257 {
 258         kfree(srq->wrid);
 259         srq->wrid = NULL;
 260 }
 261
 262 static u32 proc_srq_sge(struct hns_roce_dev *dev, struct hns_roce_srq *hr_srq,
 263                         bool user)
 264 {
 265         u32 max_sge = dev->caps.max_srq_sges;
 266
 267         if (dev->pci_dev->revision >= PCI_REVISION_ID_HIP09)
 268                 return max_sge;
 269
 270         /* Reserve SGEs only for HIP08 in kernel; The userspace driver will
 271          * calculate number of max_sge with reserved SGEs when allocating wqe
 272          * buf, so there is no need to do this again in kernel. But the number
 273          * may exceed the capacity of SGEs recorded in the firmware, so the
 274          * kernel driver should just adapt the value accordingly.
 275          */
 276         if (user)
 277                 max_sge = roundup_pow_of_two(max_sge + 1);
 278         else
 279                 hr_srq->rsv_sge = 1;
 280
 281         return max_sge;
 282 }
 283
 284 static int set_srq_basic_param(struct hns_roce_srq *srq,
 285                                struct ib_srq_init_attr *init_attr,
 286                                struct ib_udata *udata)
 287 {
 288         struct hns_roce_dev *hr_dev = to_hr_dev(srq->ibsrq.device);
 289         struct ib_srq_attr *attr = &init_attr->attr;
 290         u32 max_sge;
 291
 292         max_sge = proc_srq_sge(hr_dev, srq, !!udata);
 293         if (attr->max_wr > hr_dev->caps.max_srq_wrs ||
 294             attr->max_sge > max_sge) {
 295                 ibdev_err(&hr_dev->ib_dev,
 296                           "invalid SRQ attr, depth = %u, sge = %u.\n",
 297                           attr->max_wr, attr->max_sge);
 298                 return -EINVAL;
 299         }
 300
 301         attr->max_wr = max_t(u32, attr->max_wr, HNS_ROCE_MIN_SRQ_WQE_NUM);
 302         srq->wqe_cnt = roundup_pow_of_two(attr->max_wr);
 303         srq->max_gs = roundup_pow_of_two(attr->max_sge + srq->rsv_sge);
 304
 305         attr->max_wr = srq->wqe_cnt;
 306         attr->max_sge = srq->max_gs - srq->rsv_sge;
 307         attr->srq_limit = 0;
 308
 309         return 0;
 310 }
 311
 312 static void set_srq_ext_param(struct hns_roce_srq *srq,
 313                               struct ib_srq_init_attr *init_attr)
 314 {
 315         srq->cqn = ib_srq_has_cq(init_attr->srq_type) ?
 316                    to_hr_cq(init_attr->ext.cq)->cqn : 0;
 317 }
 318
 319 static int set_srq_param(struct hns_roce_srq *srq,
 320                          struct ib_srq_init_attr *init_attr,
 321                          struct ib_udata *udata)
 322 {
 323         int ret;
 324
 325         ret = set_srq_basic_param(srq, init_attr, udata);
 326         if (ret)
 327                 return ret;
 328
 329         set_srq_ext_param(srq, init_attr);
 330
 331         return 0;
 332 }
 333
 334 static int alloc_srq_buf(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq,
 335                          struct ib_udata *udata)
 336 {
 337         struct hns_roce_ib_create_srq ucmd = {};
 338         int ret;
 339
 340         if (udata) {
 341                 ret = ib_copy_from_udata(&ucmd, udata,
 342                                          min(udata->inlen, sizeof(ucmd)));
 343                 if (ret) {
 344                         ibdev_err(&hr_dev->ib_dev,
 345                                   "failed to copy SRQ udata, ret = %d.\n",
 346                                   ret);
 347                         return ret;
 348                 }
 349         }
 350
 351         ret = alloc_srq_idx(hr_dev, srq, udata, ucmd.que_addr);
 352         if (ret)
 353                 return ret;
 354
 355         ret = alloc_srq_wqe_buf(hr_dev, srq, udata, ucmd.buf_addr);
 356         if (ret)
 357                 goto err_idx;
 358
 359         if (!udata) {
 360                 ret = alloc_srq_wrid(hr_dev, srq);
 361                 if (ret)
 362                         goto err_wqe_buf;
 363         }
 364
 365         return 0;
 366
 367 err_wqe_buf:
 368         free_srq_wqe_buf(hr_dev, srq);
 369 err_idx:
 370         free_srq_idx(hr_dev, srq);
 371
 372         return ret;
 373 }
 374
 375 static void free_srq_buf(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
 376 {
 377         free_srq_wrid(srq);
 378         free_srq_wqe_buf(hr_dev, srq);
 379         free_srq_idx(hr_dev, srq);
 380 }
 381
 382 int hns_roce_create_srq(struct ib_srq *ib_srq,
 383                         struct ib_srq_init_attr *init_attr,
 384                         struct ib_udata *udata)
 385 {
 386         struct hns_roce_dev *hr_dev = to_hr_dev(ib_srq->device);
 387         struct hns_roce_ib_create_srq_resp resp = {};
 388         struct hns_roce_srq *srq = to_hr_srq(ib_srq);
 389         int ret;
 390
 391         mutex_init(&srq->mutex);
 392         spin_lock_init(&srq->lock);
 393
 394         ret = set_srq_param(srq, init_attr, udata);
 395         if (ret)
 396                 return ret;
 397
 398         ret = alloc_srq_buf(hr_dev, srq, udata);
 399         if (ret)
 400                 return ret;
 401
 402         ret = alloc_srqc(hr_dev, srq);
 403         if (ret)
 404                 goto err_srq_buf;
 405
 406         if (udata) {
 407                 resp.srqn = srq->srqn;
 408                 if (ib_copy_to_udata(udata, &resp,
 409                                      min(udata->outlen, sizeof(resp)))) {
 410                         ret = -EFAULT;
 411                         goto err_srqc;
 412                 }
 413         }
 414
 415         srq->db_reg_l = hr_dev->reg_base + SRQ_DB_REG;
 416         srq->event = hns_roce_ib_srq_event;
 417         atomic_set(&srq->refcount, 1);
 418         init_completion(&srq->free);
 419
 420         return 0;
 421
 422 err_srqc:
 423         free_srqc(hr_dev, srq);
 424 err_srq_buf:
 425         free_srq_buf(hr_dev, srq);
 426
 427         return ret;
 428 }
 429
 430 int hns_roce_destroy_srq(struct ib_srq *ibsrq, struct ib_udata *udata)
 431 {
 432         struct hns_roce_dev *hr_dev = to_hr_dev(ibsrq->device);
 433         struct hns_roce_srq *srq = to_hr_srq(ibsrq);
 434
 435         free_srqc(hr_dev, srq);
 436         free_srq_buf(hr_dev, srq);
 437         return 0;
 438 }
 439
 440 int hns_roce_init_srq_table(struct hns_roce_dev *hr_dev)
 441 {
 442         struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
 443
 444         xa_init(&srq_table->xa);
 445
 446         return hns_roce_bitmap_init(&srq_table->bitmap, hr_dev->caps.num_srqs,
 447                                     hr_dev->caps.num_srqs - 1,
 448                                     hr_dev->caps.reserved_srqs, 0);
 449 }
 450
 451 void hns_roce_cleanup_srq_table(struct hns_roce_dev *hr_dev)
 452 {
 453         hns_roce_bitmap_cleanup(&hr_dev->srq_table.bitmap);
 454 }