sys/dev/mlx5/mlx5_core/mlx5_pagealloc.c

   1 /*-
   2  * Copyright (c) 2013-2017, Mellanox Technologies, Ltd.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  *
  25  * $FreeBSD$
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/delay.h>
  31 #include <dev/mlx5/driver.h>
  32 #include "mlx5_core.h"
  33
  34 CTASSERT((uintptr_t)PAGE_MASK > (uintptr_t)PAGE_SIZE);
  35
  36 struct mlx5_pages_req {
  37         struct mlx5_core_dev *dev;
  38         u16     func_id;
  39         s32     npages;
  40         struct work_struct work;
  41 };
  42
  43
  44 enum {
  45         MAX_RECLAIM_TIME_MSECS  = 5000,
  46 };
  47
  48 static void
  49 mlx5_fwp_load_mem_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
  50 {
  51         struct mlx5_fw_page *fwp;
  52         uint8_t owned;
  53
  54         fwp = (struct mlx5_fw_page *)arg;
  55         owned = MLX5_DMA_OWNED(fwp->dev);
  56
  57         if (!owned)
  58                 MLX5_DMA_LOCK(fwp->dev);
  59
  60         if (error == 0) {
  61                 KASSERT(nseg == 1, ("Number of segments is different from 1"));
  62                 fwp->dma_addr = segs->ds_addr;
  63                 fwp->load_done = MLX5_LOAD_ST_SUCCESS;
  64         } else {
  65                 fwp->load_done = MLX5_LOAD_ST_FAILURE;
  66         }
  67         MLX5_DMA_DONE(fwp->dev);
  68
  69         if (!owned)
  70                 MLX5_DMA_UNLOCK(fwp->dev);
  71 }
  72
  73 void
  74 mlx5_fwp_flush(struct mlx5_fw_page *fwp)
  75 {
  76         unsigned num = fwp->numpages;
  77
  78         while (num--)
  79                 bus_dmamap_sync(fwp[num].dev->cmd.dma_tag, fwp[num].dma_map, BUS_DMASYNC_PREWRITE);
  80 }
  81
  82 void
  83 mlx5_fwp_invalidate(struct mlx5_fw_page *fwp)
  84 {
  85         unsigned num = fwp->numpages;
  86
  87         while (num--) {
  88                 bus_dmamap_sync(fwp[num].dev->cmd.dma_tag, fwp[num].dma_map, BUS_DMASYNC_POSTREAD);
  89                 bus_dmamap_sync(fwp[num].dev->cmd.dma_tag, fwp[num].dma_map, BUS_DMASYNC_PREREAD);
  90         }
  91 }
  92
  93 struct mlx5_fw_page *
  94 mlx5_fwp_alloc(struct mlx5_core_dev *dev, gfp_t flags, unsigned num)
  95 {
  96         struct mlx5_fw_page *fwp;
  97         unsigned x;
  98         int err;
  99
 100         /* check for special case */
 101         if (num == 0) {
 102                 fwp = kzalloc(sizeof(*fwp), flags);
 103                 if (fwp != NULL)
 104                         fwp->dev = dev;
 105                 return (fwp);
 106         }
 107
 108         /* we need sleeping context for this function */
 109         if (flags & M_NOWAIT)
 110                 return (NULL);
 111
 112         fwp = kzalloc(sizeof(*fwp) * num, flags);
 113
 114         /* serialize loading the DMA map(s) */
 115         sx_xlock(&dev->cmd.dma_sx);
 116
 117         for (x = 0; x != num; x++) {
 118                 /* store pointer to MLX5 core device */
 119                 fwp[x].dev = dev;
 120                 /* store number of pages left from the array */
 121                 fwp[x].numpages = num - x;
 122
 123                 /* allocate memory */
 124                 err = bus_dmamem_alloc(dev->cmd.dma_tag, &fwp[x].virt_addr,
 125                     BUS_DMA_WAITOK | BUS_DMA_COHERENT, &fwp[x].dma_map);
 126                 if (err != 0)
 127                         goto failure;
 128
 129                 /* load memory into DMA */
 130                 MLX5_DMA_LOCK(dev);
 131                 err = bus_dmamap_load(
 132                     dev->cmd.dma_tag, fwp[x].dma_map, fwp[x].virt_addr,
 133                     MLX5_ADAPTER_PAGE_SIZE, &mlx5_fwp_load_mem_cb,
 134                     fwp + x, BUS_DMA_WAITOK | BUS_DMA_COHERENT);
 135
 136                 while (fwp[x].load_done == MLX5_LOAD_ST_NONE)
 137                         MLX5_DMA_WAIT(dev);
 138                 MLX5_DMA_UNLOCK(dev);
 139
 140                 /* check for error */
 141                 if (fwp[x].load_done != MLX5_LOAD_ST_SUCCESS) {
 142                         bus_dmamem_free(dev->cmd.dma_tag, fwp[x].virt_addr,
 143                             fwp[x].dma_map);
 144                         goto failure;
 145                 }
 146         }
 147         sx_xunlock(&dev->cmd.dma_sx);
 148         return (fwp);
 149
 150 failure:
 151         while (x--) {
 152                 bus_dmamap_unload(dev->cmd.dma_tag, fwp[x].dma_map);
 153                 bus_dmamem_free(dev->cmd.dma_tag, fwp[x].virt_addr, fwp[x].dma_map);
 154         }
 155         sx_xunlock(&dev->cmd.dma_sx);
 156         return (NULL);
 157 }
 158
 159 void
 160 mlx5_fwp_free(struct mlx5_fw_page *fwp)
 161 {
 162         struct mlx5_core_dev *dev;
 163         unsigned num;
 164
 165         /* be NULL safe */
 166         if (fwp == NULL)
 167                 return;
 168
 169         /* check for special case */
 170         if (fwp->numpages == 0) {
 171                 kfree(fwp);
 172                 return;
 173         }
 174
 175         num = fwp->numpages;
 176         dev = fwp->dev;
 177
 178         while (num--) {
 179                 bus_dmamap_unload(dev->cmd.dma_tag, fwp[num].dma_map);
 180                 bus_dmamem_free(dev->cmd.dma_tag, fwp[num].virt_addr, fwp[num].dma_map);
 181         }
 182
 183         kfree(fwp);
 184 }
 185
 186 u64
 187 mlx5_fwp_get_dma(struct mlx5_fw_page *fwp, size_t offset)
 188 {
 189         size_t index = (offset / MLX5_ADAPTER_PAGE_SIZE);
 190         KASSERT(index < fwp->numpages, ("Invalid offset: %lld", (long long)offset));
 191
 192         return ((fwp + index)->dma_addr + (offset % MLX5_ADAPTER_PAGE_SIZE));
 193 }
 194
 195 void *
 196 mlx5_fwp_get_virt(struct mlx5_fw_page *fwp, size_t offset)
 197 {
 198         size_t index = (offset / MLX5_ADAPTER_PAGE_SIZE);
 199         KASSERT(index < fwp->numpages, ("Invalid offset: %lld", (long long)offset));
 200
 201         return ((char *)(fwp + index)->virt_addr + (offset % MLX5_ADAPTER_PAGE_SIZE));
 202 }
 203
 204 static int
 205 mlx5_insert_fw_page_locked(struct mlx5_core_dev *dev, struct mlx5_fw_page *nfp)
 206 {
 207         struct rb_root *root = &dev->priv.page_root;
 208         struct rb_node **new = &root->rb_node;
 209         struct rb_node *parent = NULL;
 210         struct mlx5_fw_page *tfp;
 211
 212         while (*new) {
 213                 parent = *new;
 214                 tfp = rb_entry(parent, struct mlx5_fw_page, rb_node);
 215                 if (tfp->dma_addr < nfp->dma_addr)
 216                         new = &parent->rb_left;
 217                 else if (tfp->dma_addr > nfp->dma_addr)
 218                         new = &parent->rb_right;
 219                 else
 220                         return (-EEXIST);
 221         }
 222
 223         rb_link_node(&nfp->rb_node, parent, new);
 224         rb_insert_color(&nfp->rb_node, root);
 225         return (0);
 226 }
 227
 228 static struct mlx5_fw_page *
 229 mlx5_remove_fw_page_locked(struct mlx5_core_dev *dev, bus_addr_t addr)
 230 {
 231         struct rb_root *root = &dev->priv.page_root;
 232         struct rb_node *tmp = root->rb_node;
 233         struct mlx5_fw_page *result = NULL;
 234         struct mlx5_fw_page *tfp;
 235
 236         while (tmp) {
 237                 tfp = rb_entry(tmp, struct mlx5_fw_page, rb_node);
 238                 if (tfp->dma_addr < addr) {
 239                         tmp = tmp->rb_left;
 240                 } else if (tfp->dma_addr > addr) {
 241                         tmp = tmp->rb_right;
 242                 } else {
 243                         rb_erase(&tfp->rb_node, &dev->priv.page_root);
 244                         result = tfp;
 245                         break;
 246                 }
 247         }
 248         return (result);
 249 }
 250
 251 static int
 252 alloc_4k(struct mlx5_core_dev *dev, u64 *addr, u16 func_id)
 253 {
 254         struct mlx5_fw_page *fwp;
 255         int err;
 256
 257         fwp = mlx5_fwp_alloc(dev, GFP_KERNEL, 1);
 258         if (fwp == NULL)
 259                 return (-ENOMEM);
 260
 261         fwp->func_id = func_id;
 262
 263         MLX5_DMA_LOCK(dev);
 264         err = mlx5_insert_fw_page_locked(dev, fwp);
 265         MLX5_DMA_UNLOCK(dev);
 266
 267         if (err != 0) {
 268                 mlx5_fwp_free(fwp);
 269         } else {
 270                 /* make sure cached data is cleaned */
 271                 mlx5_fwp_invalidate(fwp);
 272
 273                 /* store DMA address */
 274                 *addr = fwp->dma_addr;
 275         }
 276         return (err);
 277 }
 278
 279 static void
 280 free_4k(struct mlx5_core_dev *dev, u64 addr)
 281 {
 282         struct mlx5_fw_page *fwp;
 283
 284         MLX5_DMA_LOCK(dev);
 285         fwp = mlx5_remove_fw_page_locked(dev, addr);
 286         MLX5_DMA_UNLOCK(dev);
 287
 288         if (fwp == NULL) {
 289                 mlx5_core_warn(dev, "Cannot free 4K page at 0x%llx\n", (long long)addr);
 290                 return;
 291         }
 292         mlx5_fwp_free(fwp);
 293 }
 294
 295 static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
 296                                 s32 *npages, int boot)
 297 {
 298         u32 in[MLX5_ST_SZ_DW(query_pages_in)] = {0};
 299         u32 out[MLX5_ST_SZ_DW(query_pages_out)] = {0};
 300         int err;
 301
 302         MLX5_SET(query_pages_in, in, opcode, MLX5_CMD_OP_QUERY_PAGES);
 303         MLX5_SET(query_pages_in, in, op_mod, boot ?
 304                  MLX5_QUERY_PAGES_IN_OP_MOD_BOOT_PAGES :
 305                  MLX5_QUERY_PAGES_IN_OP_MOD_INIT_PAGES);
 306
 307         err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
 308         if (err)
 309                 return err;
 310
 311         *npages = MLX5_GET(query_pages_out, out, num_pages);
 312         *func_id = MLX5_GET(query_pages_out, out, function_id);
 313
 314         return 0;
 315 }
 316
 317 static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
 318                       int notify_fail)
 319 {
 320         u32 out[MLX5_ST_SZ_DW(manage_pages_out)] = {0};
 321         int inlen = MLX5_ST_SZ_BYTES(manage_pages_in);
 322         u64 addr;
 323         int err;
 324         u32 *in, *nin;
 325         int i = 0;
 326
 327         inlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_in, pas[0]);
 328         in = mlx5_vzalloc(inlen);
 329         if (!in) {
 330                 mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
 331                 err = -ENOMEM;
 332                 goto out_alloc;
 333         }
 334
 335         for (i = 0; i < npages; i++) {
 336                 err = alloc_4k(dev, &addr, func_id);
 337                 if (err)
 338                         goto out_alloc;
 339                 MLX5_ARRAY_SET64(manage_pages_in, in, pas, i, addr);
 340         }
 341
 342         MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
 343         MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_GIVE);
 344         MLX5_SET(manage_pages_in, in, function_id, func_id);
 345         MLX5_SET(manage_pages_in, in, input_num_entries, npages);
 346
 347         err = mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
 348         if (err) {
 349                 mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
 350                                func_id, npages, err);
 351                 goto out_alloc;
 352         }
 353         dev->priv.fw_pages += npages;
 354         dev->priv.pages_per_func[func_id] += npages;
 355
 356         mlx5_core_dbg(dev, "err %d\n", err);
 357
 358         goto out_free;
 359
 360 out_alloc:
 361         if (notify_fail) {
 362                 nin = mlx5_vzalloc(inlen);
 363                 if (!nin)
 364                         goto out_4k;
 365
 366                 memset(&out, 0, sizeof(out));
 367                 MLX5_SET(manage_pages_in, nin, opcode, MLX5_CMD_OP_MANAGE_PAGES);
 368                 MLX5_SET(manage_pages_in, nin, op_mod, MLX5_PAGES_CANT_GIVE);
 369                 MLX5_SET(manage_pages_in, nin, function_id, func_id);
 370                 if (mlx5_cmd_exec(dev, nin, inlen, out, sizeof(out)))
 371                         mlx5_core_warn(dev, "page notify failed\n");
 372                 kvfree(nin);
 373         }
 374
 375 out_4k:
 376         for (i--; i >= 0; i--)
 377                 free_4k(dev, MLX5_GET64(manage_pages_in, in, pas[i]));
 378 out_free:
 379         kvfree(in);
 380         return err;
 381 }
 382
 383 static int reclaim_pages_cmd(struct mlx5_core_dev *dev,
 384                              u32 *in, int in_size, u32 *out, int out_size)
 385 {
 386         struct mlx5_fw_page *fwp;
 387         struct rb_node *p;
 388         u32 func_id;
 389         u32 npages;
 390         u32 i = 0;
 391
 392         if (dev->state != MLX5_DEVICE_STATE_INTERNAL_ERROR)
 393                 return mlx5_cmd_exec(dev, in, in_size, out, out_size);
 394
 395         /* No hard feelings, we want our pages back! */
 396         npages = MLX5_GET(manage_pages_in, in, input_num_entries);
 397         func_id = MLX5_GET(manage_pages_in, in, function_id);
 398
 399         p = rb_first(&dev->priv.page_root);
 400         while (p && i < npages) {
 401                 fwp = rb_entry(p, struct mlx5_fw_page, rb_node);
 402                 p = rb_next(p);
 403                 if (fwp->func_id != func_id)
 404                         continue;
 405
 406                 MLX5_ARRAY_SET64(manage_pages_out, out, pas, i, fwp->dma_addr);
 407                 i++;
 408         }
 409
 410         MLX5_SET(manage_pages_out, out, output_num_entries, i);
 411         return 0;
 412 }
 413
 414 static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
 415                          int *nclaimed)
 416 {
 417         int outlen = MLX5_ST_SZ_BYTES(manage_pages_out);
 418         u32 in[MLX5_ST_SZ_DW(manage_pages_in)] = {0};
 419         int num_claimed;
 420         u32 *out;
 421         int err;
 422         int i;
 423
 424         if (nclaimed)
 425                 *nclaimed = 0;
 426
 427         outlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
 428         out = mlx5_vzalloc(outlen);
 429         if (!out)
 430                 return -ENOMEM;
 431
 432         MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
 433         MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_TAKE);
 434         MLX5_SET(manage_pages_in, in, function_id, func_id);
 435         MLX5_SET(manage_pages_in, in, input_num_entries, npages);
 436
 437         mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
 438         err = reclaim_pages_cmd(dev, in, sizeof(in), out, outlen);
 439         if (err) {
 440                 mlx5_core_err(dev, "failed reclaiming pages\n");
 441                 goto out_free;
 442         }
 443
 444         num_claimed = MLX5_GET(manage_pages_out, out, output_num_entries);
 445         if (nclaimed)
 446                 *nclaimed = num_claimed;
 447
 448         dev->priv.fw_pages -= num_claimed;
 449         dev->priv.pages_per_func[func_id] -= num_claimed;
 450         for (i = 0; i < num_claimed; i++)
 451                 free_4k(dev, MLX5_GET64(manage_pages_out, out, pas[i]));
 452
 453 out_free:
 454         kvfree(out);
 455         return err;
 456 }
 457
 458 static void pages_work_handler(struct work_struct *work)
 459 {
 460         struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
 461         struct mlx5_core_dev *dev = req->dev;
 462         int err = 0;
 463
 464         if (req->npages < 0)
 465                 err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL);
 466         else if (req->npages > 0)
 467                 err = give_pages(dev, req->func_id, req->npages, 1);
 468
 469         if (err)
 470                 mlx5_core_warn(dev, "%s fail %d\n",
 471                                req->npages < 0 ? "reclaim" : "give", err);
 472
 473         kfree(req);
 474 }
 475
 476 void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
 477                                  s32 npages)
 478 {
 479         struct mlx5_pages_req *req;
 480
 481         req = kzalloc(sizeof(*req), GFP_ATOMIC);
 482         if (!req) {
 483                 mlx5_core_warn(dev, "failed to allocate pages request\n");
 484                 return;
 485         }
 486
 487         req->dev = dev;
 488         req->func_id = func_id;
 489         req->npages = npages;
 490         INIT_WORK(&req->work, pages_work_handler);
 491         if (!queue_work(dev->priv.pg_wq, &req->work))
 492                 mlx5_core_warn(dev, "failed to queue pages handler work\n");
 493 }
 494
 495 int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
 496 {
 497         u16 uninitialized_var(func_id);
 498         s32 uninitialized_var(npages);
 499         int err;
 500
 501         err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
 502         if (err)
 503                 return err;
 504
 505         mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
 506                       npages, boot ? "boot" : "init", func_id);
 507
 508         return give_pages(dev, func_id, npages, 0);
 509 }
 510
 511 enum {
 512         MLX5_BLKS_FOR_RECLAIM_PAGES = 12
 513 };
 514
 515 s64 mlx5_wait_for_reclaim_vfs_pages(struct mlx5_core_dev *dev)
 516 {
 517         int end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
 518         s64 prevpages = 0;
 519         s64 npages = 0;
 520
 521         while (!time_after(jiffies, end)) {
 522                 /* exclude own function, VFs only */
 523                 npages = dev->priv.fw_pages - dev->priv.pages_per_func[0];
 524                 if (!npages)
 525                         break;
 526
 527                 if (npages != prevpages)
 528                         end = end + msecs_to_jiffies(100);
 529
 530                 prevpages = npages;
 531                 msleep(1);
 532         }
 533
 534         if (npages)
 535                 mlx5_core_warn(dev, "FW did not return all VFs pages, will cause to memory leak\n");
 536
 537         return -npages;
 538 }
 539
 540 static int optimal_reclaimed_pages(void)
 541 {
 542         struct mlx5_cmd_prot_block *block;
 543         struct mlx5_cmd_layout *lay;
 544         int ret;
 545
 546         ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
 547                MLX5_ST_SZ_BYTES(manage_pages_out)) /
 548                MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
 549
 550         return ret;
 551 }
 552
 553 int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
 554 {
 555         int end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
 556         struct mlx5_fw_page *fwp;
 557         struct rb_node *p;
 558         int nclaimed = 0;
 559         int err;
 560
 561         do {
 562                 p = rb_first(&dev->priv.page_root);
 563                 if (p) {
 564                         fwp = rb_entry(p, struct mlx5_fw_page, rb_node);
 565                         err = reclaim_pages(dev, fwp->func_id,
 566                                             optimal_reclaimed_pages(),
 567                                             &nclaimed);
 568                         if (err) {
 569                                 mlx5_core_warn(dev, "failed reclaiming pages (%d)\n",
 570                                                err);
 571                                 return err;
 572                         }
 573
 574                         if (nclaimed)
 575                                 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
 576                 }
 577                 if (time_after(jiffies, end)) {
 578                         mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
 579                         break;
 580                 }
 581         } while (p);
 582
 583         return 0;
 584 }
 585
 586 void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
 587 {
 588
 589         dev->priv.page_root = RB_ROOT;
 590 }
 591
 592 void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
 593 {
 594         /* nothing */
 595 }
 596
 597 int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
 598 {
 599         dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
 600         if (!dev->priv.pg_wq)
 601                 return -ENOMEM;
 602
 603         return 0;
 604 }
 605
 606 void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
 607 {
 608         destroy_workqueue(dev->priv.pg_wq);
 609 }