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
  41 enum {
  42         MLX5_PAGES_CANT_GIVE    = 0,
  43         MLX5_PAGES_GIVE         = 1,
  44         MLX5_PAGES_TAKE         = 2
  45 };
  46
  47 enum {
  48         MLX5_BOOT_PAGES         = 1,
  49         MLX5_INIT_PAGES         = 2,
  50         MLX5_POST_INIT_PAGES    = 3
  51 };
  52
  53 struct mlx5_pages_req {
  54         struct mlx5_core_dev *dev;
  55         u16     func_id;
  56         s32     npages;
  57         struct work_struct work;
  58 };
  59
  60 struct fw_page {
  61         struct rb_node          rb_node;
  62         u64                     addr;
  63         struct page            *page;
  64         u16                     func_id;
  65         unsigned long           bitmask;
  66         struct list_head        list;
  67         unsigned                free_count;
  68 };
  69
  70 struct mlx5_query_pages_inbox {
  71         struct mlx5_inbox_hdr   hdr;
  72         u8                      rsvd[8];
  73 };
  74
  75 struct mlx5_query_pages_outbox {
  76         struct mlx5_outbox_hdr  hdr;
  77         __be16                  rsvd;
  78         __be16                  func_id;
  79         __be32                  num_pages;
  80 };
  81
  82 struct mlx5_manage_pages_inbox {
  83         struct mlx5_inbox_hdr   hdr;
  84         __be16                  rsvd;
  85         __be16                  func_id;
  86         __be32                  num_entries;
  87         __be64                  pas[0];
  88 };
  89
  90 struct mlx5_manage_pages_outbox {
  91         struct mlx5_outbox_hdr  hdr;
  92         __be32                  num_entries;
  93         u8                      rsvd[4];
  94         __be64                  pas[0];
  95 };
  96
  97 enum {
  98         MAX_RECLAIM_TIME_MSECS  = 5000,
  99         MAX_RECLAIM_VFS_PAGES_TIME_MSECS = 2 * 1000 * 60,
 100 };
 101
 102 enum {
 103         MLX5_MAX_RECLAIM_TIME_MILI      = 5000,
 104         MLX5_NUM_4K_IN_PAGE             = PAGE_SIZE / MLX5_ADAPTER_PAGE_SIZE,
 105 };
 106
 107 static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u16 func_id)
 108 {
 109         struct rb_root *root = &dev->priv.page_root;
 110         struct rb_node **new = &root->rb_node;
 111         struct rb_node *parent = NULL;
 112         struct fw_page *nfp;
 113         struct fw_page *tfp;
 114         int i;
 115
 116         while (*new) {
 117                 parent = *new;
 118                 tfp = rb_entry(parent, struct fw_page, rb_node);
 119                 if (tfp->addr < addr)
 120                         new = &parent->rb_left;
 121                 else if (tfp->addr > addr)
 122                         new = &parent->rb_right;
 123                 else
 124                         return -EEXIST;
 125         }
 126
 127         nfp = kzalloc(sizeof(*nfp), GFP_KERNEL);
 128         if (!nfp)
 129                 return -ENOMEM;
 130
 131         nfp->addr = addr;
 132         nfp->page = page;
 133         nfp->func_id = func_id;
 134         nfp->free_count = MLX5_NUM_4K_IN_PAGE;
 135         for (i = 0; i < MLX5_NUM_4K_IN_PAGE; i++)
 136                 set_bit(i, &nfp->bitmask);
 137
 138         rb_link_node(&nfp->rb_node, parent, new);
 139         rb_insert_color(&nfp->rb_node, root);
 140         list_add(&nfp->list, &dev->priv.free_list);
 141
 142         return 0;
 143 }
 144
 145 static struct fw_page *find_fw_page(struct mlx5_core_dev *dev, u64 addr)
 146 {
 147         struct rb_root *root = &dev->priv.page_root;
 148         struct rb_node *tmp = root->rb_node;
 149         struct fw_page *result = NULL;
 150         struct fw_page *tfp;
 151
 152         while (tmp) {
 153                 tfp = rb_entry(tmp, struct fw_page, rb_node);
 154                 if (tfp->addr < addr) {
 155                         tmp = tmp->rb_left;
 156                 } else if (tfp->addr > addr) {
 157                         tmp = tmp->rb_right;
 158                 } else {
 159                         result = tfp;
 160                         break;
 161                 }
 162         }
 163
 164         return result;
 165 }
 166
 167 static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
 168                                 s32 *npages, int boot)
 169 {
 170         struct mlx5_query_pages_inbox   in;
 171         struct mlx5_query_pages_outbox  out;
 172         int err;
 173
 174         memset(&in, 0, sizeof(in));
 175         memset(&out, 0, sizeof(out));
 176         in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_QUERY_PAGES);
 177         in.hdr.opmod = boot ? cpu_to_be16(MLX5_BOOT_PAGES) : cpu_to_be16(MLX5_INIT_PAGES);
 178
 179         err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
 180         if (err)
 181                 return err;
 182
 183         if (out.hdr.status)
 184                 return mlx5_cmd_status_to_err(&out.hdr);
 185
 186         *npages = be32_to_cpu(out.num_pages);
 187         *func_id = be16_to_cpu(out.func_id);
 188
 189         return err;
 190 }
 191
 192 static int alloc_4k(struct mlx5_core_dev *dev, u64 *addr)
 193 {
 194         struct fw_page *fp;
 195         unsigned n;
 196
 197         if (list_empty(&dev->priv.free_list))
 198                 return -ENOMEM;
 199
 200         fp = list_entry(dev->priv.free_list.next, struct fw_page, list);
 201         n = find_first_bit(&fp->bitmask, 8 * sizeof(fp->bitmask));
 202         if (n >= MLX5_NUM_4K_IN_PAGE) {
 203                 mlx5_core_warn(dev, "alloc 4k bug\n");
 204                 return -ENOENT;
 205         }
 206         clear_bit(n, &fp->bitmask);
 207         fp->free_count--;
 208         if (!fp->free_count)
 209                 list_del(&fp->list);
 210
 211         *addr = fp->addr + n * MLX5_ADAPTER_PAGE_SIZE;
 212
 213         return 0;
 214 }
 215
 216 #define MLX5_U64_4K_PAGE_MASK ((~(u64)0U) << PAGE_SHIFT)
 217
 218 static void free_4k(struct mlx5_core_dev *dev, u64 addr)
 219 {
 220         struct fw_page *fwp;
 221         int n;
 222
 223         fwp = find_fw_page(dev, addr & MLX5_U64_4K_PAGE_MASK);
 224         if (!fwp) {
 225                 mlx5_core_warn(dev, "page not found\n");
 226                 return;
 227         }
 228
 229         n = (addr & ~MLX5_U64_4K_PAGE_MASK) >> MLX5_ADAPTER_PAGE_SHIFT;
 230         fwp->free_count++;
 231         set_bit(n, &fwp->bitmask);
 232         if (fwp->free_count == MLX5_NUM_4K_IN_PAGE) {
 233                 rb_erase(&fwp->rb_node, &dev->priv.page_root);
 234                 if (fwp->free_count != 1)
 235                         list_del(&fwp->list);
 236                 dma_unmap_page(&dev->pdev->dev, addr & MLX5_U64_4K_PAGE_MASK,
 237                                PAGE_SIZE, DMA_BIDIRECTIONAL);
 238                 __free_page(fwp->page);
 239                 kfree(fwp);
 240         } else if (fwp->free_count == 1) {
 241                 list_add(&fwp->list, &dev->priv.free_list);
 242         }
 243 }
 244
 245 static int alloc_system_page(struct mlx5_core_dev *dev, u16 func_id)
 246 {
 247         struct page *page;
 248         u64 addr;
 249         int err;
 250         int nid = dev_to_node(&dev->pdev->dev);
 251
 252         page = alloc_pages_node(nid, GFP_HIGHUSER, 0);
 253         if (!page) {
 254                 mlx5_core_warn(dev, "failed to allocate page\n");
 255                 return -ENOMEM;
 256         }
 257         addr = dma_map_page(&dev->pdev->dev, page, 0,
 258                             PAGE_SIZE, DMA_BIDIRECTIONAL);
 259         if (dma_mapping_error(&dev->pdev->dev, addr)) {
 260                 mlx5_core_warn(dev, "failed dma mapping page\n");
 261                 err = -ENOMEM;
 262                 goto out_alloc;
 263         }
 264         err = insert_page(dev, addr, page, func_id);
 265         if (err) {
 266                 mlx5_core_err(dev, "failed to track allocated page\n");
 267                 goto out_mapping;
 268         }
 269
 270         return 0;
 271
 272 out_mapping:
 273         dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
 274
 275 out_alloc:
 276         __free_page(page);
 277
 278         return err;
 279 }
 280
 281 static void page_notify_fail(struct mlx5_core_dev *dev, u16 func_id)
 282 {
 283         struct mlx5_manage_pages_inbox *in;
 284         struct mlx5_manage_pages_outbox out;
 285         int err;
 286
 287         in = kzalloc(sizeof(*in), GFP_KERNEL);
 288         if (!in)
 289                 return;
 290
 291         memset(&out, 0, sizeof(out));
 292         in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
 293         in->hdr.opmod = cpu_to_be16(MLX5_PAGES_CANT_GIVE);
 294         in->func_id = cpu_to_be16(func_id);
 295         err = mlx5_cmd_exec(dev, in, sizeof(*in), &out, sizeof(out));
 296         if (!err)
 297                 err = mlx5_cmd_status_to_err(&out.hdr);
 298
 299         if (err)
 300                 mlx5_core_warn(dev, "page notify failed\n");
 301
 302         kfree(in);
 303 }
 304
 305 static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
 306                       int notify_fail)
 307 {
 308         struct mlx5_manage_pages_inbox *in;
 309         struct mlx5_manage_pages_outbox out;
 310         int inlen;
 311         u64 addr;
 312         int err;
 313         int i;
 314
 315         inlen = sizeof(*in) + npages * sizeof(in->pas[0]);
 316         in = mlx5_vzalloc(inlen);
 317         if (!in) {
 318                 err = -ENOMEM;
 319                 mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
 320                 goto out_free;
 321         }
 322         memset(&out, 0, sizeof(out));
 323
 324         for (i = 0; i < npages; i++) {
 325 retry:
 326                 err = alloc_4k(dev, &addr);
 327                 if (err) {
 328                         if (err == -ENOMEM)
 329                                 err = alloc_system_page(dev, func_id);
 330                         if (err)
 331                                 goto out_4k;
 332
 333                         goto retry;
 334                 }
 335                 in->pas[i] = cpu_to_be64(addr);
 336         }
 337
 338         in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
 339         in->hdr.opmod = cpu_to_be16(MLX5_PAGES_GIVE);
 340         in->func_id = cpu_to_be16(func_id);
 341         in->num_entries = cpu_to_be32(npages);
 342         err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
 343         if (err) {
 344                 mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
 345                                func_id, npages, err);
 346                 goto out_4k;
 347         }
 348
 349         err = mlx5_cmd_status_to_err(&out.hdr);
 350         if (err) {
 351                 mlx5_core_warn(dev, "func_id 0x%x, npages %d, status %d\n",
 352                                func_id, npages, out.hdr.status);
 353                 goto out_4k;
 354         }
 355
 356         dev->priv.fw_pages += npages;
 357         if (func_id)
 358                 dev->priv.vfs_pages += npages;
 359
 360         mlx5_core_dbg(dev, "err %d\n", err);
 361
 362         kvfree(in);
 363         return 0;
 364
 365 out_4k:
 366         for (i--; i >= 0; i--)
 367                 free_4k(dev, be64_to_cpu(in->pas[i]));
 368 out_free:
 369         kvfree(in);
 370         if (notify_fail)
 371                 page_notify_fail(dev, func_id);
 372         return err;
 373 }
 374
 375 static int reclaim_pages_cmd(struct mlx5_core_dev *dev,
 376                              struct mlx5_manage_pages_inbox *in, int in_size,
 377                              struct mlx5_manage_pages_outbox *out, int out_size)
 378 {
 379         struct fw_page *fwp;
 380         struct rb_node *p;
 381         u32 npages;
 382         u32 i = 0;
 383
 384         if (dev->state != MLX5_DEVICE_STATE_INTERNAL_ERROR)
 385                 return mlx5_cmd_exec_check_status(dev, (u32 *)in, in_size,
 386                                                   (u32 *)out, out_size);
 387
 388         npages = be32_to_cpu(in->num_entries);
 389
 390         p = rb_first(&dev->priv.page_root);
 391         while (p && i < npages) {
 392                 fwp = rb_entry(p, struct fw_page, rb_node);
 393                 out->pas[i] = cpu_to_be64(fwp->addr);
 394                 p = rb_next(p);
 395                 i++;
 396         }
 397
 398         out->num_entries = cpu_to_be32(i);
 399         return 0;
 400 }
 401
 402 static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
 403                          int *nclaimed)
 404 {
 405         struct mlx5_manage_pages_inbox   in;
 406         struct mlx5_manage_pages_outbox *out;
 407         int num_claimed;
 408         int outlen;
 409         u64 addr;
 410         int err;
 411         int i;
 412
 413         if (nclaimed)
 414                 *nclaimed = 0;
 415
 416         memset(&in, 0, sizeof(in));
 417         outlen = sizeof(*out) + npages * sizeof(out->pas[0]);
 418         out = mlx5_vzalloc(outlen);
 419         if (!out)
 420                 return -ENOMEM;
 421
 422         in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
 423         in.hdr.opmod = cpu_to_be16(MLX5_PAGES_TAKE);
 424         in.func_id = cpu_to_be16(func_id);
 425         in.num_entries = cpu_to_be32(npages);
 426         mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
 427         err = reclaim_pages_cmd(dev, &in, sizeof(in), out, outlen);
 428         if (err) {
 429                 mlx5_core_err(dev, "failed reclaiming pages: err %d\n", err);
 430                 goto out_free;
 431         }
 432
 433         num_claimed = be32_to_cpu(out->num_entries);
 434         if (num_claimed > npages) {
 435                 mlx5_core_warn(dev, "fw returned %d, driver asked %d => corruption\n",
 436                                num_claimed, npages);
 437                 err = -EINVAL;
 438                 goto out_free;
 439         }
 440
 441         for (i = 0; i < num_claimed; i++) {
 442                 addr = be64_to_cpu(out->pas[i]);
 443                 free_4k(dev, addr);
 444         }
 445
 446         if (nclaimed)
 447                 *nclaimed = num_claimed;
 448
 449         dev->priv.fw_pages -= num_claimed;
 450         if (func_id)
 451                 dev->priv.vfs_pages -= num_claimed;
 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         queue_work(dev->priv.pg_wq, &req->work);
 492 }
 493
 494 int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
 495 {
 496         u16 uninitialized_var(func_id);
 497         s32 uninitialized_var(npages);
 498         int err;
 499
 500         err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
 501         if (err)
 502                 return err;
 503
 504         mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
 505                       npages, boot ? "boot" : "init", func_id);
 506
 507         return give_pages(dev, func_id, npages, 0);
 508 }
 509
 510 enum {
 511         MLX5_BLKS_FOR_RECLAIM_PAGES = 12
 512 };
 513
 514 static int optimal_reclaimed_pages(void)
 515 {
 516         struct mlx5_cmd_prot_block *block;
 517         struct mlx5_cmd_layout *lay;
 518         int ret;
 519
 520         ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
 521                sizeof(struct mlx5_manage_pages_outbox)) /
 522                FIELD_SIZEOF(struct mlx5_manage_pages_outbox, pas[0]);
 523
 524         return ret;
 525 }
 526
 527 int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
 528 {
 529         unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
 530         struct fw_page *fwp;
 531         struct rb_node *p;
 532         int nclaimed = 0;
 533         int err = 0;
 534
 535         do {
 536                 p = rb_first(&dev->priv.page_root);
 537                 if (p) {
 538                         fwp = rb_entry(p, struct fw_page, rb_node);
 539                         err = reclaim_pages(dev, fwp->func_id,
 540                                             optimal_reclaimed_pages(),
 541                                             &nclaimed);
 542
 543                         if (err) {
 544                                 mlx5_core_warn(dev, "failed reclaiming pages (%d)\n",
 545                                                err);
 546                                 return err;
 547                         }
 548                         if (nclaimed)
 549                                 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
 550                 }
 551                 if (time_after(jiffies, end)) {
 552                         mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
 553                         break;
 554                 }
 555         } while (p);
 556
 557         WARN(dev->priv.fw_pages,
 558              "FW pages counter is %d after reclaiming all pages\n",
 559              dev->priv.fw_pages);
 560         WARN(dev->priv.vfs_pages,
 561              "VFs FW pages counter is %d after reclaiming all pages\n",
 562              dev->priv.vfs_pages);
 563
 564         return 0;
 565 }
 566
 567 void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
 568 {
 569         dev->priv.page_root = RB_ROOT;
 570         INIT_LIST_HEAD(&dev->priv.free_list);
 571 }
 572
 573 void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
 574 {
 575         /* nothing */
 576 }
 577
 578 int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
 579 {
 580         dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
 581         if (!dev->priv.pg_wq)
 582                 return -ENOMEM;
 583
 584         return 0;
 585 }
 586
 587 void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
 588 {
 589         destroy_workqueue(dev->priv.pg_wq);
 590 }
 591
 592 int mlx5_wait_for_vf_pages(struct mlx5_core_dev *dev)
 593 {
 594         unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
 595         int prev_vfs_pages = dev->priv.vfs_pages;
 596
 597         mlx5_core_dbg(dev, "Waiting for %d pages from %s\n", prev_vfs_pages,
 598                       dev->priv.name);
 599         while (dev->priv.vfs_pages) {
 600                 if (time_after(jiffies, end)) {
 601                         mlx5_core_warn(dev, "aborting while there are %d pending pages\n", dev->priv.vfs_pages);
 602                         return -ETIMEDOUT;
 603                 }
 604                 if (dev->priv.vfs_pages < prev_vfs_pages) {
 605                         end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
 606                         prev_vfs_pages = dev->priv.vfs_pages;
 607                 }
 608                 msleep(50);
 609         }
 610
 611         mlx5_core_dbg(dev, "All pages received from %s\n", dev->priv.name);
 612         return 0;
 613 }