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 <asm-generic/kmap_types.h>
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/mlx5/driver.h>
  37 #include <linux/mlx5/cmd.h>
  38 #include "mlx5_core.h"
  39
  40 enum {
  41         MLX5_PAGES_CANT_GIVE    = 0,
  42         MLX5_PAGES_GIVE         = 1,
  43         MLX5_PAGES_TAKE         = 2
  44 };
  45
  46 enum {
  47         MLX5_BOOT_PAGES         = 1,
  48         MLX5_INIT_PAGES         = 2,
  49         MLX5_POST_INIT_PAGES    = 3
  50 };
  51
  52 struct mlx5_pages_req {
  53         struct mlx5_core_dev *dev;
  54         u16     func_id;
  55         s32     npages;
  56         struct work_struct work;
  57 };
  58
  59 struct fw_page {
  60         struct rb_node          rb_node;
  61         u64                     addr;
  62         struct page            *page;
  63         u16                     func_id;
  64         unsigned long           bitmask;
  65         struct list_head        list;
  66         unsigned                free_count;
  67 };
  68
  69 struct mlx5_query_pages_inbox {
  70         struct mlx5_inbox_hdr   hdr;
  71         u8                      rsvd[8];
  72 };
  73
  74 struct mlx5_query_pages_outbox {
  75         struct mlx5_outbox_hdr  hdr;
  76         __be16                  rsvd;
  77         __be16                  func_id;
  78         __be32                  num_pages;
  79 };
  80
  81 struct mlx5_manage_pages_inbox {
  82         struct mlx5_inbox_hdr   hdr;
  83         __be16                  rsvd;
  84         __be16                  func_id;
  85         __be32                  num_entries;
  86         __be64                  pas[0];
  87 };
  88
  89 struct mlx5_manage_pages_outbox {
  90         struct mlx5_outbox_hdr  hdr;
  91         __be32                  num_entries;
  92         u8                      rsvd[4];
  93         __be64                  pas[0];
  94 };
  95
  96 enum {
  97         MAX_RECLAIM_TIME_MSECS  = 5000,
  98 };
  99
 100 enum {
 101         MLX5_MAX_RECLAIM_TIME_MILI      = 5000,
 102         MLX5_NUM_4K_IN_PAGE             = PAGE_SIZE / MLX5_ADAPTER_PAGE_SIZE,
 103 };
 104
 105 static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u16 func_id)
 106 {
 107         struct rb_root *root = &dev->priv.page_root;
 108         struct rb_node **new = &root->rb_node;
 109         struct rb_node *parent = NULL;
 110         struct fw_page *nfp;
 111         struct fw_page *tfp;
 112         int i;
 113
 114         while (*new) {
 115                 parent = *new;
 116                 tfp = rb_entry(parent, struct fw_page, rb_node);
 117                 if (tfp->addr < addr)
 118                         new = &parent->rb_left;
 119                 else if (tfp->addr > addr)
 120                         new = &parent->rb_right;
 121                 else
 122                         return -EEXIST;
 123         }
 124
 125         nfp = kzalloc(sizeof(*nfp), GFP_KERNEL);
 126         if (!nfp)
 127                 return -ENOMEM;
 128
 129         nfp->addr = addr;
 130         nfp->page = page;
 131         nfp->func_id = func_id;
 132         nfp->free_count = MLX5_NUM_4K_IN_PAGE;
 133         for (i = 0; i < MLX5_NUM_4K_IN_PAGE; i++)
 134                 set_bit(i, &nfp->bitmask);
 135
 136         rb_link_node(&nfp->rb_node, parent, new);
 137         rb_insert_color(&nfp->rb_node, root);
 138         list_add(&nfp->list, &dev->priv.free_list);
 139
 140         return 0;
 141 }
 142
 143 static struct fw_page *find_fw_page(struct mlx5_core_dev *dev, u64 addr)
 144 {
 145         struct rb_root *root = &dev->priv.page_root;
 146         struct rb_node *tmp = root->rb_node;
 147         struct fw_page *result = NULL;
 148         struct fw_page *tfp;
 149
 150         while (tmp) {
 151                 tfp = rb_entry(tmp, struct fw_page, rb_node);
 152                 if (tfp->addr < addr) {
 153                         tmp = tmp->rb_left;
 154                 } else if (tfp->addr > addr) {
 155                         tmp = tmp->rb_right;
 156                 } else {
 157                         result = tfp;
 158                         break;
 159                 }
 160         }
 161
 162         return result;
 163 }
 164
 165 static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
 166                                 s32 *npages, int boot)
 167 {
 168         struct mlx5_query_pages_inbox   in;
 169         struct mlx5_query_pages_outbox  out;
 170         int err;
 171
 172         memset(&in, 0, sizeof(in));
 173         memset(&out, 0, sizeof(out));
 174         in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_QUERY_PAGES);
 175         in.hdr.opmod = boot ? cpu_to_be16(MLX5_BOOT_PAGES) : cpu_to_be16(MLX5_INIT_PAGES);
 176
 177         err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
 178         if (err)
 179                 return err;
 180
 181         if (out.hdr.status)
 182                 return mlx5_cmd_status_to_err(&out.hdr);
 183
 184         *npages = be32_to_cpu(out.num_pages);
 185         *func_id = be16_to_cpu(out.func_id);
 186
 187         return err;
 188 }
 189
 190 static int alloc_4k(struct mlx5_core_dev *dev, u64 *addr)
 191 {
 192         struct fw_page *fp;
 193         unsigned n;
 194
 195         if (list_empty(&dev->priv.free_list))
 196                 return -ENOMEM;
 197
 198         fp = list_entry(dev->priv.free_list.next, struct fw_page, list);
 199         n = find_first_bit(&fp->bitmask, 8 * sizeof(fp->bitmask));
 200         if (n >= MLX5_NUM_4K_IN_PAGE) {
 201                 mlx5_core_warn(dev, "alloc 4k bug\n");
 202                 return -ENOENT;
 203         }
 204         clear_bit(n, &fp->bitmask);
 205         fp->free_count--;
 206         if (!fp->free_count)
 207                 list_del(&fp->list);
 208
 209         *addr = fp->addr + n * MLX5_ADAPTER_PAGE_SIZE;
 210
 211         return 0;
 212 }
 213
 214 #define MLX5_U64_4K_PAGE_MASK ((~(u64)0U) << PAGE_SHIFT)
 215
 216 static void free_4k(struct mlx5_core_dev *dev, u64 addr)
 217 {
 218         struct fw_page *fwp;
 219         int n;
 220
 221         fwp = find_fw_page(dev, addr & MLX5_U64_4K_PAGE_MASK);
 222         if (!fwp) {
 223                 mlx5_core_warn(dev, "page not found\n");
 224                 return;
 225         }
 226
 227         n = (addr & ~MLX5_U64_4K_PAGE_MASK) >> MLX5_ADAPTER_PAGE_SHIFT;
 228         fwp->free_count++;
 229         set_bit(n, &fwp->bitmask);
 230         if (fwp->free_count == MLX5_NUM_4K_IN_PAGE) {
 231                 rb_erase(&fwp->rb_node, &dev->priv.page_root);
 232                 if (fwp->free_count != 1)
 233                         list_del(&fwp->list);
 234                 dma_unmap_page(&dev->pdev->dev, addr & MLX5_U64_4K_PAGE_MASK,
 235                                PAGE_SIZE, DMA_BIDIRECTIONAL);
 236                 __free_page(fwp->page);
 237                 kfree(fwp);
 238         } else if (fwp->free_count == 1) {
 239                 list_add(&fwp->list, &dev->priv.free_list);
 240         }
 241 }
 242
 243 static int alloc_system_page(struct mlx5_core_dev *dev, u16 func_id)
 244 {
 245         struct page *page;
 246         u64 addr;
 247         int err;
 248         int nid = dev_to_node(&dev->pdev->dev);
 249
 250         page = alloc_pages_node(nid, GFP_HIGHUSER, 0);
 251         if (!page) {
 252                 mlx5_core_warn(dev, "failed to allocate page\n");
 253                 return -ENOMEM;
 254         }
 255         addr = dma_map_page(&dev->pdev->dev, page, 0,
 256                             PAGE_SIZE, DMA_BIDIRECTIONAL);
 257         if (dma_mapping_error(&dev->pdev->dev, addr)) {
 258                 mlx5_core_warn(dev, "failed dma mapping page\n");
 259                 err = -ENOMEM;
 260                 goto out_alloc;
 261         }
 262         err = insert_page(dev, addr, page, func_id);
 263         if (err) {
 264                 mlx5_core_err(dev, "failed to track allocated page\n");
 265                 goto out_mapping;
 266         }
 267
 268         return 0;
 269
 270 out_mapping:
 271         dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
 272
 273 out_alloc:
 274         __free_page(page);
 275
 276         return err;
 277 }
 278 static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
 279                       int notify_fail)
 280 {
 281         struct mlx5_manage_pages_inbox *in;
 282         struct mlx5_manage_pages_outbox out;
 283         struct mlx5_manage_pages_inbox *nin;
 284         int inlen;
 285         u64 addr;
 286         int err;
 287         int i;
 288
 289         inlen = sizeof(*in) + npages * sizeof(in->pas[0]);
 290         in = mlx5_vzalloc(inlen);
 291         if (!in) {
 292                 mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
 293                 return -ENOMEM;
 294         }
 295         memset(&out, 0, sizeof(out));
 296
 297         for (i = 0; i < npages; i++) {
 298 retry:
 299                 err = alloc_4k(dev, &addr);
 300                 if (err) {
 301                         if (err == -ENOMEM)
 302                                 err = alloc_system_page(dev, func_id);
 303                         if (err)
 304                                 goto out_4k;
 305
 306                         goto retry;
 307                 }
 308                 in->pas[i] = cpu_to_be64(addr);
 309         }
 310
 311         in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
 312         in->hdr.opmod = cpu_to_be16(MLX5_PAGES_GIVE);
 313         in->func_id = cpu_to_be16(func_id);
 314         in->num_entries = cpu_to_be32(npages);
 315         err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
 316         if (err) {
 317                 mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
 318                                func_id, npages, err);
 319                 goto out_alloc;
 320         }
 321         dev->priv.fw_pages += npages;
 322
 323         if (out.hdr.status) {
 324                 err = mlx5_cmd_status_to_err(&out.hdr);
 325                 if (err) {
 326                         mlx5_core_warn(dev, "func_id 0x%x, npages %d, status %d\n",
 327                                        func_id, npages, out.hdr.status);
 328                         goto out_alloc;
 329                 }
 330         }
 331
 332         mlx5_core_dbg(dev, "err %d\n", err);
 333
 334         goto out_free;
 335
 336 out_alloc:
 337         if (notify_fail) {
 338                 nin = kzalloc(sizeof(*nin), GFP_KERNEL);
 339                 if (!nin) {
 340                         mlx5_core_warn(dev, "allocation failed\n");
 341                         goto out_4k;
 342                 }
 343                 memset(&out, 0, sizeof(out));
 344                 nin->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
 345                 nin->hdr.opmod = cpu_to_be16(MLX5_PAGES_CANT_GIVE);
 346                 if (mlx5_cmd_exec(dev, nin, sizeof(*nin), &out, sizeof(out)))
 347                         mlx5_core_warn(dev, "page notify failed\n");
 348                 kfree(nin);
 349         }
 350
 351 out_4k:
 352         for (i--; i >= 0; i--)
 353                 free_4k(dev, be64_to_cpu(in->pas[i]));
 354 out_free:
 355         kvfree(in);
 356         return err;
 357 }
 358
 359 static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
 360                          int *nclaimed)
 361 {
 362         struct mlx5_manage_pages_inbox   in;
 363         struct mlx5_manage_pages_outbox *out;
 364         int num_claimed;
 365         int outlen;
 366         u64 addr;
 367         int err;
 368         int i;
 369
 370         if (nclaimed)
 371                 *nclaimed = 0;
 372
 373         memset(&in, 0, sizeof(in));
 374         outlen = sizeof(*out) + npages * sizeof(out->pas[0]);
 375         out = mlx5_vzalloc(outlen);
 376         if (!out)
 377                 return -ENOMEM;
 378
 379         in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
 380         in.hdr.opmod = cpu_to_be16(MLX5_PAGES_TAKE);
 381         in.func_id = cpu_to_be16(func_id);
 382         in.num_entries = cpu_to_be32(npages);
 383         mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
 384         err = mlx5_cmd_exec(dev, &in, sizeof(in), out, outlen);
 385         if (err) {
 386                 mlx5_core_err(dev, "failed reclaiming pages\n");
 387                 goto out_free;
 388         }
 389         dev->priv.fw_pages -= npages;
 390
 391         if (out->hdr.status) {
 392                 err = mlx5_cmd_status_to_err(&out->hdr);
 393                 goto out_free;
 394         }
 395
 396         num_claimed = be32_to_cpu(out->num_entries);
 397         if (nclaimed)
 398                 *nclaimed = num_claimed;
 399
 400         for (i = 0; i < num_claimed; i++) {
 401                 addr = be64_to_cpu(out->pas[i]);
 402                 free_4k(dev, addr);
 403         }
 404
 405 out_free:
 406         kvfree(out);
 407         return err;
 408 }
 409
 410 static void pages_work_handler(struct work_struct *work)
 411 {
 412         struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
 413         struct mlx5_core_dev *dev = req->dev;
 414         int err = 0;
 415
 416         if (req->npages < 0)
 417                 err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL);
 418         else if (req->npages > 0)
 419                 err = give_pages(dev, req->func_id, req->npages, 1);
 420
 421         if (err)
 422                 mlx5_core_warn(dev, "%s fail %d\n",
 423                                req->npages < 0 ? "reclaim" : "give", err);
 424
 425         kfree(req);
 426 }
 427
 428 void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
 429                                  s32 npages)
 430 {
 431         struct mlx5_pages_req *req;
 432
 433         req = kzalloc(sizeof(*req), GFP_ATOMIC);
 434         if (!req) {
 435                 mlx5_core_warn(dev, "failed to allocate pages request\n");
 436                 return;
 437         }
 438
 439         req->dev = dev;
 440         req->func_id = func_id;
 441         req->npages = npages;
 442         INIT_WORK(&req->work, pages_work_handler);
 443         queue_work(dev->priv.pg_wq, &req->work);
 444 }
 445
 446 int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
 447 {
 448         u16 uninitialized_var(func_id);
 449         s32 uninitialized_var(npages);
 450         int err;
 451
 452         err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
 453         if (err)
 454                 return err;
 455
 456         mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
 457                       npages, boot ? "boot" : "init", func_id);
 458
 459         return give_pages(dev, func_id, npages, 0);
 460 }
 461
 462 enum {
 463         MLX5_BLKS_FOR_RECLAIM_PAGES = 12
 464 };
 465
 466 static int optimal_reclaimed_pages(void)
 467 {
 468         struct mlx5_cmd_prot_block *block;
 469         struct mlx5_cmd_layout *lay;
 470         int ret;
 471
 472         ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
 473                sizeof(struct mlx5_manage_pages_outbox)) /
 474                FIELD_SIZEOF(struct mlx5_manage_pages_outbox, pas[0]);
 475
 476         return ret;
 477 }
 478
 479 int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
 480 {
 481         unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
 482         struct fw_page *fwp;
 483         struct rb_node *p;
 484         int nclaimed = 0;
 485         int err;
 486
 487         do {
 488                 p = rb_first(&dev->priv.page_root);
 489                 if (p) {
 490                         fwp = rb_entry(p, struct fw_page, rb_node);
 491                         err = reclaim_pages(dev, fwp->func_id,
 492                                             optimal_reclaimed_pages(),
 493                                             &nclaimed);
 494                         if (err) {
 495                                 mlx5_core_warn(dev, "failed reclaiming pages (%d)\n",
 496                                                err);
 497                                 return err;
 498                         }
 499                         if (nclaimed)
 500                                 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
 501                 }
 502                 if (time_after(jiffies, end)) {
 503                         mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
 504                         break;
 505                 }
 506         } while (p);
 507
 508         return 0;
 509 }
 510
 511 void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
 512 {
 513         dev->priv.page_root = RB_ROOT;
 514         INIT_LIST_HEAD(&dev->priv.free_list);
 515 }
 516
 517 void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
 518 {
 519         /* nothing */
 520 }
 521
 522 int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
 523 {
 524         dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
 525         if (!dev->priv.pg_wq)
 526                 return -ENOMEM;
 527
 528         return 0;
 529 }
 530
 531 void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
 532 {
 533         destroy_workqueue(dev->priv.pg_wq);
 534 }