linux/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c
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   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/xarray.h>
  39#include "mlx5_core.h"
  40#include "lib/eq.h"
  41
  42enum {
  43        MLX5_PAGES_CANT_GIVE    = 0,
  44        MLX5_PAGES_GIVE         = 1,
  45        MLX5_PAGES_TAKE         = 2
  46};
  47
  48struct 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        u8      release_all;
  55};
  56
  57struct fw_page {
  58        struct rb_node          rb_node;
  59        u64                     addr;
  60        struct page            *page;
  61        u32                     function;
  62        unsigned long           bitmask;
  63        struct list_head        list;
  64        unsigned int free_count;
  65};
  66
  67enum {
  68        MAX_RECLAIM_TIME_MSECS  = 5000,
  69        MAX_RECLAIM_VFS_PAGES_TIME_MSECS = 2 * 1000 * 60,
  70};
  71
  72enum {
  73        MLX5_MAX_RECLAIM_TIME_MILI      = 5000,
  74        MLX5_NUM_4K_IN_PAGE             = PAGE_SIZE / MLX5_ADAPTER_PAGE_SIZE,
  75};
  76
  77static u32 get_function(u16 func_id, bool ec_function)
  78{
  79        return (u32)func_id | (ec_function << 16);
  80}
  81
  82static struct rb_root *page_root_per_function(struct mlx5_core_dev *dev, u32 function)
  83{
  84        struct rb_root *root;
  85        int err;
  86
  87        root = xa_load(&dev->priv.page_root_xa, function);
  88        if (root)
  89                return root;
  90
  91        root = kzalloc(sizeof(*root), GFP_KERNEL);
  92        if (!root)
  93                return ERR_PTR(-ENOMEM);
  94
  95        err = xa_insert(&dev->priv.page_root_xa, function, root, GFP_KERNEL);
  96        if (err) {
  97                kfree(root);
  98                return ERR_PTR(err);
  99        }
 100
 101        *root = RB_ROOT;
 102
 103        return root;
 104}
 105
 106static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u32 function)
 107{
 108        struct rb_node *parent = NULL;
 109        struct rb_root *root;
 110        struct rb_node **new;
 111        struct fw_page *nfp;
 112        struct fw_page *tfp;
 113        int i;
 114
 115        root = page_root_per_function(dev, function);
 116        if (IS_ERR(root))
 117                return PTR_ERR(root);
 118
 119        new = &root->rb_node;
 120
 121        while (*new) {
 122                parent = *new;
 123                tfp = rb_entry(parent, struct fw_page, rb_node);
 124                if (tfp->addr < addr)
 125                        new = &parent->rb_left;
 126                else if (tfp->addr > addr)
 127                        new = &parent->rb_right;
 128                else
 129                        return -EEXIST;
 130        }
 131
 132        nfp = kzalloc(sizeof(*nfp), GFP_KERNEL);
 133        if (!nfp)
 134                return -ENOMEM;
 135
 136        nfp->addr = addr;
 137        nfp->page = page;
 138        nfp->function = function;
 139        nfp->free_count = MLX5_NUM_4K_IN_PAGE;
 140        for (i = 0; i < MLX5_NUM_4K_IN_PAGE; i++)
 141                set_bit(i, &nfp->bitmask);
 142
 143        rb_link_node(&nfp->rb_node, parent, new);
 144        rb_insert_color(&nfp->rb_node, root);
 145        list_add(&nfp->list, &dev->priv.free_list);
 146
 147        return 0;
 148}
 149
 150static struct fw_page *find_fw_page(struct mlx5_core_dev *dev, u64 addr,
 151                                    u32 function)
 152{
 153        struct fw_page *result = NULL;
 154        struct rb_root *root;
 155        struct rb_node *tmp;
 156        struct fw_page *tfp;
 157
 158        root = xa_load(&dev->priv.page_root_xa, function);
 159        if (WARN_ON_ONCE(!root))
 160                return NULL;
 161
 162        tmp = root->rb_node;
 163
 164        while (tmp) {
 165                tfp = rb_entry(tmp, struct fw_page, rb_node);
 166                if (tfp->addr < addr) {
 167                        tmp = tmp->rb_left;
 168                } else if (tfp->addr > addr) {
 169                        tmp = tmp->rb_right;
 170                } else {
 171                        result = tfp;
 172                        break;
 173                }
 174        }
 175
 176        return result;
 177}
 178
 179static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
 180                                s32 *npages, int boot)
 181{
 182        u32 out[MLX5_ST_SZ_DW(query_pages_out)] = {};
 183        u32 in[MLX5_ST_SZ_DW(query_pages_in)] = {};
 184        int err;
 185
 186        MLX5_SET(query_pages_in, in, opcode, MLX5_CMD_OP_QUERY_PAGES);
 187        MLX5_SET(query_pages_in, in, op_mod, boot ?
 188                 MLX5_QUERY_PAGES_IN_OP_MOD_BOOT_PAGES :
 189                 MLX5_QUERY_PAGES_IN_OP_MOD_INIT_PAGES);
 190        MLX5_SET(query_pages_in, in, embedded_cpu_function, mlx5_core_is_ecpf(dev));
 191
 192        err = mlx5_cmd_exec_inout(dev, query_pages, in, out);
 193        if (err)
 194                return err;
 195
 196        *npages = MLX5_GET(query_pages_out, out, num_pages);
 197        *func_id = MLX5_GET(query_pages_out, out, function_id);
 198
 199        return err;
 200}
 201
 202static int alloc_4k(struct mlx5_core_dev *dev, u64 *addr, u32 function)
 203{
 204        struct fw_page *fp = NULL;
 205        struct fw_page *iter;
 206        unsigned n;
 207
 208        list_for_each_entry(iter, &dev->priv.free_list, list) {
 209                if (iter->function != function)
 210                        continue;
 211                fp = iter;
 212        }
 213
 214        if (list_empty(&dev->priv.free_list) || !fp)
 215                return -ENOMEM;
 216
 217        n = find_first_bit(&fp->bitmask, 8 * sizeof(fp->bitmask));
 218        if (n >= MLX5_NUM_4K_IN_PAGE) {
 219                mlx5_core_warn(dev, "alloc 4k bug\n");
 220                return -ENOENT;
 221        }
 222        clear_bit(n, &fp->bitmask);
 223        fp->free_count--;
 224        if (!fp->free_count)
 225                list_del(&fp->list);
 226
 227        *addr = fp->addr + n * MLX5_ADAPTER_PAGE_SIZE;
 228
 229        return 0;
 230}
 231
 232#define MLX5_U64_4K_PAGE_MASK ((~(u64)0U) << PAGE_SHIFT)
 233
 234static void free_fwp(struct mlx5_core_dev *dev, struct fw_page *fwp,
 235                     bool in_free_list)
 236{
 237        struct rb_root *root;
 238
 239        root = xa_load(&dev->priv.page_root_xa, fwp->function);
 240        if (WARN_ON_ONCE(!root))
 241                return;
 242
 243        rb_erase(&fwp->rb_node, root);
 244        if (in_free_list)
 245                list_del(&fwp->list);
 246        dma_unmap_page(mlx5_core_dma_dev(dev), fwp->addr & MLX5_U64_4K_PAGE_MASK,
 247                       PAGE_SIZE, DMA_BIDIRECTIONAL);
 248        __free_page(fwp->page);
 249        kfree(fwp);
 250}
 251
 252static void free_4k(struct mlx5_core_dev *dev, u64 addr, u32 function)
 253{
 254        struct fw_page *fwp;
 255        int n;
 256
 257        fwp = find_fw_page(dev, addr & MLX5_U64_4K_PAGE_MASK, function);
 258        if (!fwp) {
 259                mlx5_core_warn_rl(dev, "page not found\n");
 260                return;
 261        }
 262        n = (addr & ~MLX5_U64_4K_PAGE_MASK) >> MLX5_ADAPTER_PAGE_SHIFT;
 263        fwp->free_count++;
 264        set_bit(n, &fwp->bitmask);
 265        if (fwp->free_count == MLX5_NUM_4K_IN_PAGE)
 266                free_fwp(dev, fwp, fwp->free_count != 1);
 267        else if (fwp->free_count == 1)
 268                list_add(&fwp->list, &dev->priv.free_list);
 269}
 270
 271static int alloc_system_page(struct mlx5_core_dev *dev, u32 function)
 272{
 273        struct device *device = mlx5_core_dma_dev(dev);
 274        int nid = dev_to_node(device);
 275        struct page *page;
 276        u64 zero_addr = 1;
 277        u64 addr;
 278        int err;
 279
 280        page = alloc_pages_node(nid, GFP_HIGHUSER, 0);
 281        if (!page) {
 282                mlx5_core_warn(dev, "failed to allocate page\n");
 283                return -ENOMEM;
 284        }
 285map:
 286        addr = dma_map_page(device, page, 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
 287        if (dma_mapping_error(device, addr)) {
 288                mlx5_core_warn(dev, "failed dma mapping page\n");
 289                err = -ENOMEM;
 290                goto err_mapping;
 291        }
 292
 293        /* Firmware doesn't support page with physical address 0 */
 294        if (addr == 0) {
 295                zero_addr = addr;
 296                goto map;
 297        }
 298
 299        err = insert_page(dev, addr, page, function);
 300        if (err) {
 301                mlx5_core_err(dev, "failed to track allocated page\n");
 302                dma_unmap_page(device, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
 303        }
 304
 305err_mapping:
 306        if (err)
 307                __free_page(page);
 308
 309        if (zero_addr == 0)
 310                dma_unmap_page(device, zero_addr, PAGE_SIZE,
 311                               DMA_BIDIRECTIONAL);
 312
 313        return err;
 314}
 315
 316static void page_notify_fail(struct mlx5_core_dev *dev, u16 func_id,
 317                             bool ec_function)
 318{
 319        u32 in[MLX5_ST_SZ_DW(manage_pages_in)] = {};
 320        int err;
 321
 322        MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
 323        MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_CANT_GIVE);
 324        MLX5_SET(manage_pages_in, in, function_id, func_id);
 325        MLX5_SET(manage_pages_in, in, embedded_cpu_function, ec_function);
 326
 327        err = mlx5_cmd_exec_in(dev, manage_pages, in);
 328        if (err)
 329                mlx5_core_warn(dev, "page notify failed func_id(%d) err(%d)\n",
 330                               func_id, err);
 331}
 332
 333static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
 334                      int notify_fail, bool ec_function)
 335{
 336        u32 function = get_function(func_id, ec_function);
 337        u32 out[MLX5_ST_SZ_DW(manage_pages_out)] = {0};
 338        int inlen = MLX5_ST_SZ_BYTES(manage_pages_in);
 339        u64 addr;
 340        int err;
 341        u32 *in;
 342        int i;
 343
 344        inlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_in, pas[0]);
 345        in = kvzalloc(inlen, GFP_KERNEL);
 346        if (!in) {
 347                err = -ENOMEM;
 348                mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
 349                goto out_free;
 350        }
 351
 352        for (i = 0; i < npages; i++) {
 353retry:
 354                err = alloc_4k(dev, &addr, function);
 355                if (err) {
 356                        if (err == -ENOMEM)
 357                                err = alloc_system_page(dev, function);
 358                        if (err)
 359                                goto out_4k;
 360
 361                        goto retry;
 362                }
 363                MLX5_ARRAY_SET64(manage_pages_in, in, pas, i, addr);
 364        }
 365
 366        MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
 367        MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_GIVE);
 368        MLX5_SET(manage_pages_in, in, function_id, func_id);
 369        MLX5_SET(manage_pages_in, in, input_num_entries, npages);
 370        MLX5_SET(manage_pages_in, in, embedded_cpu_function, ec_function);
 371
 372        err = mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
 373        if (err) {
 374                mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
 375                               func_id, npages, err);
 376                goto out_4k;
 377        }
 378
 379        dev->priv.fw_pages += npages;
 380        if (func_id)
 381                dev->priv.vfs_pages += npages;
 382        else if (mlx5_core_is_ecpf(dev) && !ec_function)
 383                dev->priv.host_pf_pages += npages;
 384
 385        mlx5_core_dbg(dev, "npages %d, ec_function %d, func_id 0x%x, err %d\n",
 386                      npages, ec_function, func_id, err);
 387
 388        kvfree(in);
 389        return 0;
 390
 391out_4k:
 392        for (i--; i >= 0; i--)
 393                free_4k(dev, MLX5_GET64(manage_pages_in, in, pas[i]), function);
 394out_free:
 395        kvfree(in);
 396        if (notify_fail)
 397                page_notify_fail(dev, func_id, ec_function);
 398        return err;
 399}
 400
 401static void release_all_pages(struct mlx5_core_dev *dev, u16 func_id,
 402                              bool ec_function)
 403{
 404        u32 function = get_function(func_id, ec_function);
 405        struct rb_root *root;
 406        struct rb_node *p;
 407        int npages = 0;
 408
 409        root = xa_load(&dev->priv.page_root_xa, function);
 410        if (WARN_ON_ONCE(!root))
 411                return;
 412
 413        p = rb_first(root);
 414        while (p) {
 415                struct fw_page *fwp = rb_entry(p, struct fw_page, rb_node);
 416
 417                p = rb_next(p);
 418                npages += (MLX5_NUM_4K_IN_PAGE - fwp->free_count);
 419                free_fwp(dev, fwp, fwp->free_count);
 420        }
 421
 422        dev->priv.fw_pages -= npages;
 423        if (func_id)
 424                dev->priv.vfs_pages -= npages;
 425        else if (mlx5_core_is_ecpf(dev) && !ec_function)
 426                dev->priv.host_pf_pages -= npages;
 427
 428        mlx5_core_dbg(dev, "npages %d, ec_function %d, func_id 0x%x\n",
 429                      npages, ec_function, func_id);
 430}
 431
 432static u32 fwp_fill_manage_pages_out(struct fw_page *fwp, u32 *out, u32 index,
 433                                     u32 npages)
 434{
 435        u32 pages_set = 0;
 436        unsigned int n;
 437
 438        for_each_clear_bit(n, &fwp->bitmask, MLX5_NUM_4K_IN_PAGE) {
 439                MLX5_ARRAY_SET64(manage_pages_out, out, pas, index + pages_set,
 440                                 fwp->addr + (n * MLX5_ADAPTER_PAGE_SIZE));
 441                pages_set++;
 442
 443                if (!--npages)
 444                        break;
 445        }
 446
 447        return pages_set;
 448}
 449
 450static int reclaim_pages_cmd(struct mlx5_core_dev *dev,
 451                             u32 *in, int in_size, u32 *out, int out_size)
 452{
 453        struct rb_root *root;
 454        struct fw_page *fwp;
 455        struct rb_node *p;
 456        bool ec_function;
 457        u32 func_id;
 458        u32 npages;
 459        u32 i = 0;
 460
 461        if (!mlx5_cmd_is_down(dev))
 462                return mlx5_cmd_exec(dev, in, in_size, out, out_size);
 463
 464        /* No hard feelings, we want our pages back! */
 465        npages = MLX5_GET(manage_pages_in, in, input_num_entries);
 466        func_id = MLX5_GET(manage_pages_in, in, function_id);
 467        ec_function = MLX5_GET(manage_pages_in, in, embedded_cpu_function);
 468
 469        root = xa_load(&dev->priv.page_root_xa, get_function(func_id, ec_function));
 470        if (WARN_ON_ONCE(!root))
 471                return -EEXIST;
 472
 473        p = rb_first(root);
 474        while (p && i < npages) {
 475                fwp = rb_entry(p, struct fw_page, rb_node);
 476                p = rb_next(p);
 477
 478                i += fwp_fill_manage_pages_out(fwp, out, i, npages - i);
 479        }
 480
 481        MLX5_SET(manage_pages_out, out, output_num_entries, i);
 482        return 0;
 483}
 484
 485static int reclaim_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
 486                         int *nclaimed, bool ec_function)
 487{
 488        u32 function = get_function(func_id, ec_function);
 489        int outlen = MLX5_ST_SZ_BYTES(manage_pages_out);
 490        u32 in[MLX5_ST_SZ_DW(manage_pages_in)] = {};
 491        int num_claimed;
 492        u32 *out;
 493        int err;
 494        int i;
 495
 496        if (nclaimed)
 497                *nclaimed = 0;
 498
 499        outlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
 500        out = kvzalloc(outlen, GFP_KERNEL);
 501        if (!out)
 502                return -ENOMEM;
 503
 504        MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
 505        MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_TAKE);
 506        MLX5_SET(manage_pages_in, in, function_id, func_id);
 507        MLX5_SET(manage_pages_in, in, input_num_entries, npages);
 508        MLX5_SET(manage_pages_in, in, embedded_cpu_function, ec_function);
 509
 510        mlx5_core_dbg(dev, "func 0x%x, npages %d, outlen %d\n",
 511                      func_id, npages, outlen);
 512        err = reclaim_pages_cmd(dev, in, sizeof(in), out, outlen);
 513        if (err) {
 514                mlx5_core_err(dev, "failed reclaiming pages: err %d\n", err);
 515                goto out_free;
 516        }
 517
 518        num_claimed = MLX5_GET(manage_pages_out, out, output_num_entries);
 519        if (num_claimed > npages) {
 520                mlx5_core_warn(dev, "fw returned %d, driver asked %d => corruption\n",
 521                               num_claimed, npages);
 522                err = -EINVAL;
 523                goto out_free;
 524        }
 525
 526        for (i = 0; i < num_claimed; i++)
 527                free_4k(dev, MLX5_GET64(manage_pages_out, out, pas[i]), function);
 528
 529        if (nclaimed)
 530                *nclaimed = num_claimed;
 531
 532        dev->priv.fw_pages -= num_claimed;
 533        if (func_id)
 534                dev->priv.vfs_pages -= num_claimed;
 535        else if (mlx5_core_is_ecpf(dev) && !ec_function)
 536                dev->priv.host_pf_pages -= num_claimed;
 537
 538out_free:
 539        kvfree(out);
 540        return err;
 541}
 542
 543static void pages_work_handler(struct work_struct *work)
 544{
 545        struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
 546        struct mlx5_core_dev *dev = req->dev;
 547        int err = 0;
 548
 549        if (req->release_all)
 550                release_all_pages(dev, req->func_id, req->ec_function);
 551        else if (req->npages < 0)
 552                err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL,
 553                                    req->ec_function);
 554        else if (req->npages > 0)
 555                err = give_pages(dev, req->func_id, req->npages, 1, req->ec_function);
 556
 557        if (err)
 558                mlx5_core_warn(dev, "%s fail %d\n",
 559                               req->npages < 0 ? "reclaim" : "give", err);
 560
 561        kfree(req);
 562}
 563
 564enum {
 565        EC_FUNCTION_MASK = 0x8000,
 566        RELEASE_ALL_PAGES_MASK = 0x4000,
 567};
 568
 569static int req_pages_handler(struct notifier_block *nb,
 570                             unsigned long type, void *data)
 571{
 572        struct mlx5_pages_req *req;
 573        struct mlx5_core_dev *dev;
 574        struct mlx5_priv *priv;
 575        struct mlx5_eqe *eqe;
 576        bool ec_function;
 577        bool release_all;
 578        u16 func_id;
 579        s32 npages;
 580
 581        priv = mlx5_nb_cof(nb, struct mlx5_priv, pg_nb);
 582        dev  = container_of(priv, struct mlx5_core_dev, priv);
 583        eqe  = data;
 584
 585        func_id = be16_to_cpu(eqe->data.req_pages.func_id);
 586        npages  = be32_to_cpu(eqe->data.req_pages.num_pages);
 587        ec_function = be16_to_cpu(eqe->data.req_pages.ec_function) & EC_FUNCTION_MASK;
 588        release_all = be16_to_cpu(eqe->data.req_pages.ec_function) &
 589                      RELEASE_ALL_PAGES_MASK;
 590        mlx5_core_dbg(dev, "page request for func 0x%x, npages %d, release_all %d\n",
 591                      func_id, npages, release_all);
 592        req = kzalloc(sizeof(*req), GFP_ATOMIC);
 593        if (!req) {
 594                mlx5_core_warn(dev, "failed to allocate pages request\n");
 595                return NOTIFY_DONE;
 596        }
 597
 598        req->dev = dev;
 599        req->func_id = func_id;
 600        req->npages = npages;
 601        req->ec_function = ec_function;
 602        req->release_all = release_all;
 603        INIT_WORK(&req->work, pages_work_handler);
 604        queue_work(dev->priv.pg_wq, &req->work);
 605        return NOTIFY_OK;
 606}
 607
 608int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
 609{
 610        u16 func_id;
 611        s32 npages;
 612        int err;
 613
 614        err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
 615        if (err)
 616                return err;
 617
 618        mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
 619                      npages, boot ? "boot" : "init", func_id);
 620
 621        return give_pages(dev, func_id, npages, 0, mlx5_core_is_ecpf(dev));
 622}
 623
 624enum {
 625        MLX5_BLKS_FOR_RECLAIM_PAGES = 12
 626};
 627
 628static int optimal_reclaimed_pages(void)
 629{
 630        struct mlx5_cmd_prot_block *block;
 631        struct mlx5_cmd_layout *lay;
 632        int ret;
 633
 634        ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
 635               MLX5_ST_SZ_BYTES(manage_pages_out)) /
 636               MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
 637
 638        return ret;
 639}
 640
 641static int mlx5_reclaim_root_pages(struct mlx5_core_dev *dev,
 642                                   struct rb_root *root, u16 func_id)
 643{
 644        unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
 645
 646        while (!RB_EMPTY_ROOT(root)) {
 647                int nclaimed;
 648                int err;
 649
 650                err = reclaim_pages(dev, func_id, optimal_reclaimed_pages(),
 651                                    &nclaimed, mlx5_core_is_ecpf(dev));
 652                if (err) {
 653                        mlx5_core_warn(dev, "failed reclaiming pages (%d) for func id 0x%x\n",
 654                                       err, func_id);
 655                        return err;
 656                }
 657
 658                if (nclaimed)
 659                        end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
 660
 661                if (time_after(jiffies, end)) {
 662                        mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
 663                        break;
 664                }
 665        }
 666
 667        return 0;
 668}
 669
 670int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
 671{
 672        struct rb_root *root;
 673        unsigned long id;
 674        void *entry;
 675
 676        xa_for_each(&dev->priv.page_root_xa, id, entry) {
 677                root = entry;
 678                mlx5_reclaim_root_pages(dev, root, id);
 679                xa_erase(&dev->priv.page_root_xa, id);
 680                kfree(root);
 681        }
 682
 683        WARN_ON(!xa_empty(&dev->priv.page_root_xa));
 684
 685        WARN(dev->priv.fw_pages,
 686             "FW pages counter is %d after reclaiming all pages\n",
 687             dev->priv.fw_pages);
 688        WARN(dev->priv.vfs_pages,
 689             "VFs FW pages counter is %d after reclaiming all pages\n",
 690             dev->priv.vfs_pages);
 691        WARN(dev->priv.host_pf_pages,
 692             "External host PF FW pages counter is %d after reclaiming all pages\n",
 693             dev->priv.host_pf_pages);
 694
 695        return 0;
 696}
 697
 698int mlx5_pagealloc_init(struct mlx5_core_dev *dev)
 699{
 700        INIT_LIST_HEAD(&dev->priv.free_list);
 701        dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
 702        if (!dev->priv.pg_wq)
 703                return -ENOMEM;
 704
 705        xa_init(&dev->priv.page_root_xa);
 706
 707        return 0;
 708}
 709
 710void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
 711{
 712        xa_destroy(&dev->priv.page_root_xa);
 713        destroy_workqueue(dev->priv.pg_wq);
 714}
 715
 716void mlx5_pagealloc_start(struct mlx5_core_dev *dev)
 717{
 718        MLX5_NB_INIT(&dev->priv.pg_nb, req_pages_handler, PAGE_REQUEST);
 719        mlx5_eq_notifier_register(dev, &dev->priv.pg_nb);
 720}
 721
 722void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
 723{
 724        mlx5_eq_notifier_unregister(dev, &dev->priv.pg_nb);
 725        flush_workqueue(dev->priv.pg_wq);
 726}
 727
 728int mlx5_wait_for_pages(struct mlx5_core_dev *dev, int *pages)
 729{
 730        unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
 731        int prev_pages = *pages;
 732
 733        /* In case of internal error we will free the pages manually later */
 734        if (dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
 735                mlx5_core_warn(dev, "Skipping wait for vf pages stage");
 736                return 0;
 737        }
 738
 739        mlx5_core_dbg(dev, "Waiting for %d pages\n", prev_pages);
 740        while (*pages) {
 741                if (time_after(jiffies, end)) {
 742                        mlx5_core_warn(dev, "aborting while there are %d pending pages\n", *pages);
 743                        return -ETIMEDOUT;
 744                }
 745                if (*pages < prev_pages) {
 746                        end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
 747                        prev_pages = *pages;
 748                }
 749                msleep(50);
 750        }
 751
 752        mlx5_core_dbg(dev, "All pages received\n");
 753        return 0;
 754}
 755
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