drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c

   1 /*
   2  * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
   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/highmem.h>
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/delay.h>
  37 #include <linux/mlx5/driver.h>
  38 #include <linux/mlx5/cmd.h>
  39 #include "mlx5_core.h"
  40 #include "lib/eq.h"
  41
  42 enum {
  43         MLX5_PAGES_CANT_GIVE    = 0,
  44         MLX5_PAGES_GIVE         = 1,
  45         MLX5_PAGES_TAKE         = 2
  46 };
  47
  48 struct mlx5_pages_req {
  49         struct mlx5_core_dev *dev;
  50         u16     func_id;
  51         u8      ec_function;
  52         s32     npages;
  53         struct work_struct work;
  54 };
  55
  56 struct fw_page {
  57         struct rb_node          rb_node;
  58         u64                     addr;
  59         struct page            *page;
  60         u16                     func_id;
  61         unsigned long           bitmask;
  62         struct list_head        list;
  63         unsigned                free_count;
  64 };
  65
  66 enum {
  67         MAX_RECLAIM_TIME_MSECS  = 5000,
  68         MAX_RECLAIM_VFS_PAGES_TIME_MSECS = 2 * 1000 * 60,
  69 };
  70
  71 enum {
  72         MLX5_MAX_RECLAIM_TIME_MILI      = 5000,
  73         MLX5_NUM_4K_IN_PAGE             = PAGE_SIZE / MLX5_ADAPTER_PAGE_SIZE,
  74 };
  75
  76 static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u16 func_id)
  77 {
  78         struct rb_root *root = &dev->priv.page_root;
  79         struct rb_node **new = &root->rb_node;
  80         struct rb_node *parent = NULL;
  81         struct fw_page *nfp;
  82         struct fw_page *tfp;
  83         int i;
  84
  85         while (*new) {
  86                 parent = *new;
  87                 tfp = rb_entry(parent, struct fw_page, rb_node);
  88                 if (tfp->addr < addr)
  89                         new = &parent->rb_left;
  90                 else if (tfp->addr > addr)
  91                         new = &parent->rb_right;
  92                 else
  93                         return -EEXIST;
  94         }
  95
  96         nfp = kzalloc(sizeof(*nfp), GFP_KERNEL);
  97         if (!nfp)
  98                 return -ENOMEM;
  99
 100         nfp->addr = addr;
 101         nfp->page = page;
 102         nfp->func_id = func_id;
 103         nfp->free_count = MLX5_NUM_4K_IN_PAGE;
 104         for (i = 0; i < MLX5_NUM_4K_IN_PAGE; i++)
 105                 set_bit(i, &nfp->bitmask);
 106
 107         rb_link_node(&nfp->rb_node, parent, new);
 108         rb_insert_color(&nfp->rb_node, root);
 109         list_add(&nfp->list, &dev->priv.free_list);
 110
 111         return 0;
 112 }
 113
 114 static struct fw_page *find_fw_page(struct mlx5_core_dev *dev, u64 addr)
 115 {
 116         struct rb_root *root = &dev->priv.page_root;
 117         struct rb_node *tmp = root->rb_node;
 118         struct fw_page *result = NULL;
 119         struct fw_page *tfp;
 120
 121         while (tmp) {
 122                 tfp = rb_entry(tmp, struct fw_page, rb_node);
 123                 if (tfp->addr < addr) {
 124                         tmp = tmp->rb_left;
 125                 } else if (tfp->addr > addr) {
 126                         tmp = tmp->rb_right;
 127                 } else {
 128                         result = tfp;
 129                         break;
 130                 }
 131         }
 132
 133         return result;
 134 }
 135
 136 static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
 137                                 s32 *npages, int boot)
 138 {
 139         u32 out[MLX5_ST_SZ_DW(query_pages_out)] = {0};
 140         u32 in[MLX5_ST_SZ_DW(query_pages_in)]   = {0};
 141         int err;
 142
 143         MLX5_SET(query_pages_in, in, opcode, MLX5_CMD_OP_QUERY_PAGES);
 144         MLX5_SET(query_pages_in, in, op_mod, boot ?
 145                  MLX5_QUERY_PAGES_IN_OP_MOD_BOOT_PAGES :
 146                  MLX5_QUERY_PAGES_IN_OP_MOD_INIT_PAGES);
 147         MLX5_SET(query_pages_in, in, embedded_cpu_function, mlx5_core_is_ecpf(dev));
 148
 149         err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
 150         if (err)
 151                 return err;
 152
 153         *npages = MLX5_GET(query_pages_out, out, num_pages);
 154         *func_id = MLX5_GET(query_pages_out, out, function_id);
 155
 156         return err;
 157 }
 158
 159 static int alloc_4k(struct mlx5_core_dev *dev, u64 *addr)
 160 {
 161         struct fw_page *fp;
 162         unsigned n;
 163
 164         if (list_empty(&dev->priv.free_list))
 165                 return -ENOMEM;
 166
 167         fp = list_entry(dev->priv.free_list.next, struct fw_page, list);
 168         n = find_first_bit(&fp->bitmask, 8 * sizeof(fp->bitmask));
 169         if (n >= MLX5_NUM_4K_IN_PAGE) {
 170                 mlx5_core_warn(dev, "alloc 4k bug\n");
 171                 return -ENOENT;
 172         }
 173         clear_bit(n, &fp->bitmask);
 174         fp->free_count--;
 175         if (!fp->free_count)
 176                 list_del(&fp->list);
 177
 178         *addr = fp->addr + n * MLX5_ADAPTER_PAGE_SIZE;
 179
 180         return 0;
 181 }
 182
 183 #define MLX5_U64_4K_PAGE_MASK ((~(u64)0U) << PAGE_SHIFT)
 184
 185 static void free_4k(struct mlx5_core_dev *dev, u64 addr)
 186 {
 187         struct fw_page *fwp;
 188         int n;
 189
 190         fwp = find_fw_page(dev, addr & MLX5_U64_4K_PAGE_MASK);
 191         if (!fwp) {
 192                 mlx5_core_warn(dev, "page not found\n");
 193                 return;
 194         }
 195
 196         n = (addr & ~MLX5_U64_4K_PAGE_MASK) >> MLX5_ADAPTER_PAGE_SHIFT;
 197         fwp->free_count++;
 198         set_bit(n, &fwp->bitmask);
 199         if (fwp->free_count == MLX5_NUM_4K_IN_PAGE) {
 200                 rb_erase(&fwp->rb_node, &dev->priv.page_root);
 201                 if (fwp->free_count != 1)
 202                         list_del(&fwp->list);
 203                 dma_unmap_page(dev->device, addr & MLX5_U64_4K_PAGE_MASK,
 204                                PAGE_SIZE, DMA_BIDIRECTIONAL);
 205                 __free_page(fwp->page);
 206                 kfree(fwp);
 207         } else if (fwp->free_count == 1) {
 208                 list_add(&fwp->list, &dev->priv.free_list);
 209         }
 210 }
 211
 212 static int alloc_system_page(struct mlx5_core_dev *dev, u16 func_id)
 213 {
 214         struct device *device = dev->device;
 215         int nid = dev_to_node(device);
 216         struct page *page;
 217         u64 zero_addr = 1;
 218         u64 addr;
 219         int err;
 220
 221         page = alloc_pages_node(nid, GFP_HIGHUSER, 0);
 222         if (!page) {
 223                 mlx5_core_warn(dev, "failed to allocate page\n");
 224                 return -ENOMEM;
 225         }
 226 map:
 227         addr = dma_map_page(device, page, 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
 228         if (dma_mapping_error(device, addr)) {
 229                 mlx5_core_warn(dev, "failed dma mapping page\n");
 230                 err = -ENOMEM;
 231                 goto err_mapping;
 232         }
 233
 234         /* Firmware doesn't support page with physical address 0 */
 235         if (addr == 0) {
 236                 zero_addr = addr;
 237                 goto map;
 238         }
 239
 240         err = insert_page(dev, addr, page, func_id);
 241         if (err) {
 242                 mlx5_core_err(dev, "failed to track allocated page\n");
 243                 dma_unmap_page(device, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
 244         }
 245
 246 err_mapping:
 247         if (err)
 248                 __free_page(page);
 249
 250         if (zero_addr == 0)
 251                 dma_unmap_page(device, zero_addr, PAGE_SIZE,
 252                                DMA_BIDIRECTIONAL);
 253
 254         return err;
 255 }
 256
 257 static void page_notify_fail(struct mlx5_core_dev *dev, u16 func_id,
 258                              bool ec_function)
 259 {
 260         u32 out[MLX5_ST_SZ_DW(manage_pages_out)] = {0};
 261         u32 in[MLX5_ST_SZ_DW(manage_pages_in)]   = {0};
 262         int err;
 263
 264         MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
 265         MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_CANT_GIVE);
 266         MLX5_SET(manage_pages_in, in, function_id, func_id);
 267         MLX5_SET(manage_pages_in, in, embedded_cpu_function, ec_function);
 268
 269         err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
 270         if (err)
 271                 mlx5_core_warn(dev, "page notify failed func_id(%d) err(%d)\n",
 272                                func_id, err);
 273 }
 274
 275 static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
 276                       int notify_fail, bool ec_function)
 277 {
 278         u32 out[MLX5_ST_SZ_DW(manage_pages_out)] = {0};
 279         int inlen = MLX5_ST_SZ_BYTES(manage_pages_in);
 280         u64 addr;
 281         int err;
 282         u32 *in;
 283         int i;
 284
 285         inlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_in, pas[0]);
 286         in = kvzalloc(inlen, GFP_KERNEL);
 287         if (!in) {
 288                 err = -ENOMEM;
 289                 mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
 290                 goto out_free;
 291         }
 292
 293         for (i = 0; i < npages; i++) {
 294 retry:
 295                 err = alloc_4k(dev, &addr);
 296                 if (err) {
 297                         if (err == -ENOMEM)
 298                                 err = alloc_system_page(dev, func_id);
 299                         if (err)
 300                                 goto out_4k;
 301
 302                         goto retry;
 303                 }
 304                 MLX5_ARRAY_SET64(manage_pages_in, in, pas, i, addr);
 305         }
 306
 307         MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
 308         MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_GIVE);
 309         MLX5_SET(manage_pages_in, in, function_id, func_id);
 310         MLX5_SET(manage_pages_in, in, input_num_entries, npages);
 311         MLX5_SET(manage_pages_in, in, embedded_cpu_function, ec_function);
 312
 313         err = mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
 314         if (err) {
 315                 mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
 316                                func_id, npages, err);
 317                 goto out_4k;
 318         }
 319
 320         dev->priv.fw_pages += npages;
 321         if (func_id)
 322                 dev->priv.vfs_pages += npages;
 323         else if (mlx5_core_is_ecpf(dev) && !ec_function)
 324                 dev->priv.peer_pf_pages += npages;
 325
 326         mlx5_core_dbg(dev, "npages %d, ec_function %d, func_id 0x%x, err %d\n",
 327                       npages, ec_function, func_id, err);
 328
 329         kvfree(in);
 330         return 0;
 331
 332 out_4k:
 333         for (i--; i >= 0; i--)
 334                 free_4k(dev, MLX5_GET64(manage_pages_in, in, pas[i]));
 335 out_free:
 336         kvfree(in);
 337         if (notify_fail)
 338                 page_notify_fail(dev, func_id, ec_function);
 339         return err;
 340 }
 341
 342 static int reclaim_pages_cmd(struct mlx5_core_dev *dev,
 343                              u32 *in, int in_size, u32 *out, int out_size)
 344 {
 345         struct fw_page *fwp;
 346         struct rb_node *p;
 347         u32 func_id;
 348         u32 npages;
 349         u32 i = 0;
 350
 351         if (dev->state != MLX5_DEVICE_STATE_INTERNAL_ERROR)
 352                 return mlx5_cmd_exec(dev, in, in_size, out, out_size);
 353
 354         /* No hard feelings, we want our pages back! */
 355         npages = MLX5_GET(manage_pages_in, in, input_num_entries);
 356         func_id = MLX5_GET(manage_pages_in, in, function_id);
 357
 358         p = rb_first(&dev->priv.page_root);
 359         while (p && i < npages) {
 360                 fwp = rb_entry(p, struct fw_page, rb_node);
 361                 p = rb_next(p);
 362                 if (fwp->func_id != func_id)
 363                         continue;
 364
 365                 MLX5_ARRAY_SET64(manage_pages_out, out, pas, i, fwp->addr);
 366                 i++;
 367         }
 368
 369         MLX5_SET(manage_pages_out, out, output_num_entries, i);
 370         return 0;
 371 }
 372
 373 static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
 374                          int *nclaimed, bool ec_function)
 375 {
 376         int outlen = MLX5_ST_SZ_BYTES(manage_pages_out);
 377         u32 in[MLX5_ST_SZ_DW(manage_pages_in)] = {0};
 378         int num_claimed;
 379         u32 *out;
 380         int err;
 381         int i;
 382
 383         if (nclaimed)
 384                 *nclaimed = 0;
 385
 386         outlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
 387         out = kvzalloc(outlen, GFP_KERNEL);
 388         if (!out)
 389                 return -ENOMEM;
 390
 391         MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
 392         MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_TAKE);
 393         MLX5_SET(manage_pages_in, in, function_id, func_id);
 394         MLX5_SET(manage_pages_in, in, input_num_entries, npages);
 395         MLX5_SET(manage_pages_in, in, embedded_cpu_function, ec_function);
 396
 397         mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
 398         err = reclaim_pages_cmd(dev, in, sizeof(in), out, outlen);
 399         if (err) {
 400                 mlx5_core_err(dev, "failed reclaiming pages: err %d\n", err);
 401                 goto out_free;
 402         }
 403
 404         num_claimed = MLX5_GET(manage_pages_out, out, output_num_entries);
 405         if (num_claimed > npages) {
 406                 mlx5_core_warn(dev, "fw returned %d, driver asked %d => corruption\n",
 407                                num_claimed, npages);
 408                 err = -EINVAL;
 409                 goto out_free;
 410         }
 411
 412         for (i = 0; i < num_claimed; i++)
 413                 free_4k(dev, MLX5_GET64(manage_pages_out, out, pas[i]));
 414
 415         if (nclaimed)
 416                 *nclaimed = num_claimed;
 417
 418         dev->priv.fw_pages -= num_claimed;
 419         if (func_id)
 420                 dev->priv.vfs_pages -= num_claimed;
 421         else if (mlx5_core_is_ecpf(dev) && !ec_function)
 422                 dev->priv.peer_pf_pages -= num_claimed;
 423
 424 out_free:
 425         kvfree(out);
 426         return err;
 427 }
 428
 429 static void pages_work_handler(struct work_struct *work)
 430 {
 431         struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
 432         struct mlx5_core_dev *dev = req->dev;
 433         int err = 0;
 434
 435         if (req->npages < 0)
 436                 err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL,
 437                                     req->ec_function);
 438         else if (req->npages > 0)
 439                 err = give_pages(dev, req->func_id, req->npages, 1, req->ec_function);
 440
 441         if (err)
 442                 mlx5_core_warn(dev, "%s fail %d\n",
 443                                req->npages < 0 ? "reclaim" : "give", err);
 444
 445         kfree(req);
 446 }
 447
 448 enum {
 449         EC_FUNCTION_MASK = 0x8000,
 450 };
 451
 452 static int req_pages_handler(struct notifier_block *nb,
 453                              unsigned long type, void *data)
 454 {
 455         struct mlx5_pages_req *req;
 456         struct mlx5_core_dev *dev;
 457         struct mlx5_priv *priv;
 458         struct mlx5_eqe *eqe;
 459         bool ec_function;
 460         u16 func_id;
 461         s32 npages;
 462
 463         priv = mlx5_nb_cof(nb, struct mlx5_priv, pg_nb);
 464         dev  = container_of(priv, struct mlx5_core_dev, priv);
 465         eqe  = data;
 466
 467         func_id = be16_to_cpu(eqe->data.req_pages.func_id);
 468         npages  = be32_to_cpu(eqe->data.req_pages.num_pages);
 469         ec_function = be16_to_cpu(eqe->data.req_pages.ec_function) & EC_FUNCTION_MASK;
 470         mlx5_core_dbg(dev, "page request for func 0x%x, npages %d\n",
 471                       func_id, npages);
 472         req = kzalloc(sizeof(*req), GFP_ATOMIC);
 473         if (!req) {
 474                 mlx5_core_warn(dev, "failed to allocate pages request\n");
 475                 return NOTIFY_DONE;
 476         }
 477
 478         req->dev = dev;
 479         req->func_id = func_id;
 480         req->npages = npages;
 481         req->ec_function = ec_function;
 482         INIT_WORK(&req->work, pages_work_handler);
 483         queue_work(dev->priv.pg_wq, &req->work);
 484         return NOTIFY_OK;
 485 }
 486
 487 int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
 488 {
 489         u16 uninitialized_var(func_id);
 490         s32 uninitialized_var(npages);
 491         int err;
 492
 493         err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
 494         if (err)
 495                 return err;
 496
 497         mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
 498                       npages, boot ? "boot" : "init", func_id);
 499
 500         return give_pages(dev, func_id, npages, 0, mlx5_core_is_ecpf(dev));
 501 }
 502
 503 enum {
 504         MLX5_BLKS_FOR_RECLAIM_PAGES = 12
 505 };
 506
 507 static int optimal_reclaimed_pages(void)
 508 {
 509         struct mlx5_cmd_prot_block *block;
 510         struct mlx5_cmd_layout *lay;
 511         int ret;
 512
 513         ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
 514                MLX5_ST_SZ_BYTES(manage_pages_out)) /
 515                MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
 516
 517         return ret;
 518 }
 519
 520 int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
 521 {
 522         unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
 523         struct fw_page *fwp;
 524         struct rb_node *p;
 525         int nclaimed = 0;
 526         int err = 0;
 527
 528         do {
 529                 p = rb_first(&dev->priv.page_root);
 530                 if (p) {
 531                         fwp = rb_entry(p, struct fw_page, rb_node);
 532                         err = reclaim_pages(dev, fwp->func_id,
 533                                             optimal_reclaimed_pages(),
 534                                             &nclaimed, mlx5_core_is_ecpf(dev));
 535
 536                         if (err) {
 537                                 mlx5_core_warn(dev, "failed reclaiming pages (%d)\n",
 538                                                err);
 539                                 return err;
 540                         }
 541                         if (nclaimed)
 542                                 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
 543                 }
 544                 if (time_after(jiffies, end)) {
 545                         mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
 546                         break;
 547                 }
 548         } while (p);
 549
 550         WARN(dev->priv.fw_pages,
 551              "FW pages counter is %d after reclaiming all pages\n",
 552              dev->priv.fw_pages);
 553         WARN(dev->priv.vfs_pages,
 554              "VFs FW pages counter is %d after reclaiming all pages\n",
 555              dev->priv.vfs_pages);
 556         WARN(dev->priv.peer_pf_pages,
 557              "Peer PF FW pages counter is %d after reclaiming all pages\n",
 558              dev->priv.peer_pf_pages);
 559
 560         return 0;
 561 }
 562
 563 int mlx5_pagealloc_init(struct mlx5_core_dev *dev)
 564 {
 565         dev->priv.page_root = RB_ROOT;
 566         INIT_LIST_HEAD(&dev->priv.free_list);
 567         dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
 568         if (!dev->priv.pg_wq)
 569                 return -ENOMEM;
 570
 571         return 0;
 572 }
 573
 574 void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
 575 {
 576         destroy_workqueue(dev->priv.pg_wq);
 577 }
 578
 579 void mlx5_pagealloc_start(struct mlx5_core_dev *dev)
 580 {
 581         MLX5_NB_INIT(&dev->priv.pg_nb, req_pages_handler, PAGE_REQUEST);
 582         mlx5_eq_notifier_register(dev, &dev->priv.pg_nb);
 583 }
 584
 585 void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
 586 {
 587         mlx5_eq_notifier_unregister(dev, &dev->priv.pg_nb);
 588         flush_workqueue(dev->priv.pg_wq);
 589 }
 590
 591 int mlx5_wait_for_pages(struct mlx5_core_dev *dev, int *pages)
 592 {
 593         unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
 594         int prev_pages = *pages;
 595
 596         /* In case of internal error we will free the pages manually later */
 597         if (dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
 598                 mlx5_core_warn(dev, "Skipping wait for vf pages stage");
 599                 return 0;
 600         }
 601
 602         mlx5_core_dbg(dev, "Waiting for %d pages\n", prev_pages);
 603         while (*pages) {
 604                 if (time_after(jiffies, end)) {
 605                         mlx5_core_warn(dev, "aborting while there are %d pending pages\n", *pages);
 606                         return -ETIMEDOUT;
 607                 }
 608                 if (*pages < prev_pages) {
 609                         end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
 610                         prev_pages = *pages;
 611                 }
 612                 msleep(50);
 613         }
 614
 615         mlx5_core_dbg(dev, "All pages received\n");
 616         return 0;
 617 }