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 <rdma/ib_umem.h>
   7 #include <rdma/hns-abi.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                       u32 pdn, u32 cqn, u16 xrcd, u64 db_rec_addr)
  82 {
  83         struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
  84         struct ib_device *ibdev = &hr_dev->ib_dev;
  85         struct hns_roce_cmd_mailbox *mailbox;
  86         u64 mtts_wqe[MTT_MIN_COUNT] = { 0 };
  87         u64 mtts_idx[MTT_MIN_COUNT] = { 0 };
  88         dma_addr_t dma_handle_wqe = 0;
  89         dma_addr_t dma_handle_idx = 0;
  90         int ret;
  91
  92         /* Get the physical address of srq buf */
  93         ret = hns_roce_mtr_find(hr_dev, &srq->buf_mtr, 0, mtts_wqe,
  94                                 ARRAY_SIZE(mtts_wqe), &dma_handle_wqe);
  95         if (ret < 1) {
  96                 ibdev_err(ibdev, "Failed to find mtr for SRQ WQE\n");
  97                 return -ENOBUFS;
  98         }
  99
 100         /* Get physical address of idx que buf */
 101         ret = hns_roce_mtr_find(hr_dev, &srq->idx_que.mtr, 0, mtts_idx,
 102                                 ARRAY_SIZE(mtts_idx), &dma_handle_idx);
 103         if (ret < 1) {
 104                 ibdev_err(ibdev, "Failed to find mtr for SRQ idx\n");
 105                 return -ENOBUFS;
 106         }
 107
 108         ret = hns_roce_bitmap_alloc(&srq_table->bitmap, &srq->srqn);
 109         if (ret) {
 110                 ibdev_err(ibdev, "Failed to alloc SRQ number, err %d\n", ret);
 111                 return -ENOMEM;
 112         }
 113
 114         ret = hns_roce_table_get(hr_dev, &srq_table->table, srq->srqn);
 115         if (ret) {
 116                 ibdev_err(ibdev, "Failed to get SRQC table, err %d\n", ret);
 117                 goto err_out;
 118         }
 119
 120         ret = xa_err(xa_store(&srq_table->xa, srq->srqn, srq, GFP_KERNEL));
 121         if (ret) {
 122                 ibdev_err(ibdev, "Failed to store SRQC, err %d\n", ret);
 123                 goto err_put;
 124         }
 125
 126         mailbox = hns_roce_alloc_cmd_mailbox(hr_dev);
 127         if (IS_ERR_OR_NULL(mailbox)) {
 128                 ret = -ENOMEM;
 129                 ibdev_err(ibdev, "Failed to alloc mailbox for SRQC\n");
 130                 goto err_xa;
 131         }
 132
 133         hr_dev->hw->write_srqc(hr_dev, srq, pdn, xrcd, cqn, mailbox->buf,
 134                                mtts_wqe, mtts_idx, dma_handle_wqe,
 135                                dma_handle_idx);
 136
 137         ret = hns_roce_hw_create_srq(hr_dev, mailbox, srq->srqn);
 138         hns_roce_free_cmd_mailbox(hr_dev, mailbox);
 139         if (ret) {
 140                 ibdev_err(ibdev, "Failed to config SRQC, err %d\n", ret);
 141                 goto err_xa;
 142         }
 143
 144         atomic_set(&srq->refcount, 1);
 145         init_completion(&srq->free);
 146         return ret;
 147
 148 err_xa:
 149         xa_erase(&srq_table->xa, srq->srqn);
 150
 151 err_put:
 152         hns_roce_table_put(hr_dev, &srq_table->table, srq->srqn);
 153
 154 err_out:
 155         hns_roce_bitmap_free(&srq_table->bitmap, srq->srqn, BITMAP_NO_RR);
 156         return ret;
 157 }
 158
 159 static void free_srqc(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
 160 {
 161         struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
 162         int ret;
 163
 164         ret = hns_roce_hw_destroy_srq(hr_dev, NULL, srq->srqn);
 165         if (ret)
 166                 dev_err(hr_dev->dev, "DESTROY_SRQ failed (%d) for SRQN %06lx\n",
 167                         ret, srq->srqn);
 168
 169         xa_erase(&srq_table->xa, srq->srqn);
 170
 171         if (atomic_dec_and_test(&srq->refcount))
 172                 complete(&srq->free);
 173         wait_for_completion(&srq->free);
 174
 175         hns_roce_table_put(hr_dev, &srq_table->table, srq->srqn);
 176         hns_roce_bitmap_free(&srq_table->bitmap, srq->srqn, BITMAP_NO_RR);
 177 }
 178
 179 static int alloc_srq_buf(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq,
 180                          struct ib_udata *udata, unsigned long addr)
 181 {
 182         struct ib_device *ibdev = &hr_dev->ib_dev;
 183         struct hns_roce_buf_attr buf_attr = {};
 184         int err;
 185
 186         srq->wqe_shift = ilog2(roundup_pow_of_two(max(HNS_ROCE_SGE_SIZE,
 187                                                       HNS_ROCE_SGE_SIZE *
 188                                                       srq->max_gs)));
 189
 190         buf_attr.page_shift = hr_dev->caps.srqwqe_buf_pg_sz + HNS_HW_PAGE_SHIFT;
 191         buf_attr.region[0].size = to_hr_hem_entries_size(srq->wqe_cnt,
 192                                                          srq->wqe_shift);
 193         buf_attr.region[0].hopnum = hr_dev->caps.srqwqe_hop_num;
 194         buf_attr.region_count = 1;
 195         buf_attr.fixed_page = true;
 196
 197         err = hns_roce_mtr_create(hr_dev, &srq->buf_mtr, &buf_attr,
 198                                   hr_dev->caps.srqwqe_ba_pg_sz +
 199                                   HNS_HW_PAGE_SHIFT, udata, addr);
 200         if (err)
 201                 ibdev_err(ibdev, "Failed to alloc SRQ buf mtr, err %d\n", err);
 202
 203         return err;
 204 }
 205
 206 static void free_srq_buf(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
 207 {
 208         hns_roce_mtr_destroy(hr_dev, &srq->buf_mtr);
 209 }
 210
 211 static int alloc_srq_idx(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq,
 212                          struct ib_udata *udata, unsigned long addr)
 213 {
 214         struct hns_roce_idx_que *idx_que = &srq->idx_que;
 215         struct ib_device *ibdev = &hr_dev->ib_dev;
 216         struct hns_roce_buf_attr buf_attr = {};
 217         int err;
 218
 219         srq->idx_que.entry_shift = ilog2(HNS_ROCE_IDX_QUE_ENTRY_SZ);
 220
 221         buf_attr.page_shift = hr_dev->caps.idx_buf_pg_sz + HNS_HW_PAGE_SHIFT;
 222         buf_attr.region[0].size = to_hr_hem_entries_size(srq->wqe_cnt,
 223                                         srq->idx_que.entry_shift);
 224         buf_attr.region[0].hopnum = hr_dev->caps.idx_hop_num;
 225         buf_attr.region_count = 1;
 226         buf_attr.fixed_page = true;
 227
 228         err = hns_roce_mtr_create(hr_dev, &idx_que->mtr, &buf_attr,
 229                                   hr_dev->caps.idx_ba_pg_sz + HNS_HW_PAGE_SHIFT,
 230                                   udata, addr);
 231         if (err) {
 232                 ibdev_err(ibdev, "Failed to alloc SRQ idx mtr, err %d\n", err);
 233                 return err;
 234         }
 235
 236         if (!udata) {
 237                 idx_que->bitmap = bitmap_zalloc(srq->wqe_cnt, GFP_KERNEL);
 238                 if (!idx_que->bitmap) {
 239                         ibdev_err(ibdev, "Failed to alloc SRQ idx bitmap\n");
 240                         err = -ENOMEM;
 241                         goto err_idx_mtr;
 242                 }
 243
 244         }
 245
 246         return 0;
 247 err_idx_mtr:
 248         hns_roce_mtr_destroy(hr_dev, &idx_que->mtr);
 249
 250         return err;
 251 }
 252
 253 static void free_srq_idx(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
 254 {
 255         struct hns_roce_idx_que *idx_que = &srq->idx_que;
 256
 257         bitmap_free(idx_que->bitmap);
 258         idx_que->bitmap = NULL;
 259         hns_roce_mtr_destroy(hr_dev, &idx_que->mtr);
 260 }
 261
 262 static int alloc_srq_wrid(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
 263 {
 264         srq->head = 0;
 265         srq->tail = srq->wqe_cnt - 1;
 266         srq->wrid = kvmalloc_array(srq->wqe_cnt, sizeof(u64), GFP_KERNEL);
 267         if (!srq->wrid)
 268                 return -ENOMEM;
 269
 270         return 0;
 271 }
 272
 273 static void free_srq_wrid(struct hns_roce_srq *srq)
 274 {
 275         kfree(srq->wrid);
 276         srq->wrid = NULL;
 277 }
 278
 279 int hns_roce_create_srq(struct ib_srq *ib_srq,
 280                         struct ib_srq_init_attr *init_attr,
 281                         struct ib_udata *udata)
 282 {
 283         struct hns_roce_dev *hr_dev = to_hr_dev(ib_srq->device);
 284         struct hns_roce_ib_create_srq_resp resp = {};
 285         struct hns_roce_srq *srq = to_hr_srq(ib_srq);
 286         struct ib_device *ibdev = &hr_dev->ib_dev;
 287         struct hns_roce_ib_create_srq ucmd = {};
 288         int ret = 0;
 289         u32 cqn;
 290
 291         /* Check the actual SRQ wqe and SRQ sge num */
 292         if (init_attr->attr.max_wr >= hr_dev->caps.max_srq_wrs ||
 293             init_attr->attr.max_sge > hr_dev->caps.max_srq_sges)
 294                 return -EINVAL;
 295
 296         mutex_init(&srq->mutex);
 297         spin_lock_init(&srq->lock);
 298
 299         srq->wqe_cnt = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 300         srq->max_gs = init_attr->attr.max_sge;
 301
 302         if (udata) {
 303                 ret = ib_copy_from_udata(&ucmd, udata, sizeof(ucmd));
 304                 if (ret) {
 305                         ibdev_err(ibdev, "Failed to copy SRQ udata, err %d\n",
 306                                   ret);
 307                         return ret;
 308                 }
 309         }
 310
 311         ret = alloc_srq_buf(hr_dev, srq, udata, ucmd.buf_addr);
 312         if (ret) {
 313                 ibdev_err(ibdev, "Failed to alloc SRQ buffer, err %d\n", ret);
 314                 return ret;
 315         }
 316
 317         ret = alloc_srq_idx(hr_dev, srq, udata, ucmd.que_addr);
 318         if (ret) {
 319                 ibdev_err(ibdev, "Failed to alloc SRQ idx, err %d\n", ret);
 320                 goto err_buf_alloc;
 321         }
 322
 323         if (!udata) {
 324                 ret = alloc_srq_wrid(hr_dev, srq);
 325                 if (ret) {
 326                         ibdev_err(ibdev, "Failed to alloc SRQ wrid, err %d\n",
 327                                   ret);
 328                         goto err_idx_alloc;
 329                 }
 330         }
 331
 332         cqn = ib_srq_has_cq(init_attr->srq_type) ?
 333               to_hr_cq(init_attr->ext.cq)->cqn : 0;
 334         srq->db_reg_l = hr_dev->reg_base + SRQ_DB_REG;
 335
 336         ret = alloc_srqc(hr_dev, srq, to_hr_pd(ib_srq->pd)->pdn, cqn, 0, 0);
 337         if (ret) {
 338                 ibdev_err(ibdev, "Failed to alloc SRQ context, err %d\n", ret);
 339                 goto err_wrid_alloc;
 340         }
 341
 342         srq->event = hns_roce_ib_srq_event;
 343         resp.srqn = srq->srqn;
 344
 345         if (udata) {
 346                 if (ib_copy_to_udata(udata, &resp,
 347                                      min(udata->outlen, sizeof(resp)))) {
 348                         ret = -EFAULT;
 349                         goto err_srqc_alloc;
 350                 }
 351         }
 352
 353         return 0;
 354
 355 err_srqc_alloc:
 356         free_srqc(hr_dev, srq);
 357 err_wrid_alloc:
 358         free_srq_wrid(srq);
 359 err_idx_alloc:
 360         free_srq_idx(hr_dev, srq);
 361 err_buf_alloc:
 362         free_srq_buf(hr_dev, srq);
 363         return ret;
 364 }
 365
 366 void hns_roce_destroy_srq(struct ib_srq *ibsrq, struct ib_udata *udata)
 367 {
 368         struct hns_roce_dev *hr_dev = to_hr_dev(ibsrq->device);
 369         struct hns_roce_srq *srq = to_hr_srq(ibsrq);
 370
 371         free_srqc(hr_dev, srq);
 372         free_srq_idx(hr_dev, srq);
 373         free_srq_wrid(srq);
 374         free_srq_buf(hr_dev, srq);
 375 }
 376
 377 int hns_roce_init_srq_table(struct hns_roce_dev *hr_dev)
 378 {
 379         struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
 380
 381         xa_init(&srq_table->xa);
 382
 383         return hns_roce_bitmap_init(&srq_table->bitmap, hr_dev->caps.num_srqs,
 384                                     hr_dev->caps.num_srqs - 1,
 385                                     hr_dev->caps.reserved_srqs, 0);
 386 }
 387
 388 void hns_roce_cleanup_srq_table(struct hns_roce_dev *hr_dev)
 389 {
 390         hns_roce_bitmap_cleanup(&hr_dev->srq_table.bitmap);
 391 }