drivers/net/ethernet/mellanox/mlx5/core/alloc.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/errno.h>
  34 #include <linux/slab.h>
  35 #include <linux/mm.h>
  36 #include <linux/export.h>
  37 #include <linux/bitmap.h>
  38 #include <linux/dma-mapping.h>
  39 #include <linux/vmalloc.h>
  40 #include <linux/mlx5/driver.h>
  41
  42 #include "mlx5_core.h"
  43
  44 struct mlx5_db_pgdir {
  45         struct list_head        list;
  46         unsigned long          *bitmap;
  47         __be32                 *db_page;
  48         dma_addr_t              db_dma;
  49 };
  50
  51 /* Handling for queue buffers -- we allocate a bunch of memory and
  52  * register it in a memory region at HCA virtual address 0.
  53  */
  54
  55 static void *mlx5_dma_zalloc_coherent_node(struct mlx5_core_dev *dev,
  56                                            size_t size, dma_addr_t *dma_handle,
  57                                            int node)
  58 {
  59         struct mlx5_priv *priv = &dev->priv;
  60         int original_node;
  61         void *cpu_handle;
  62
  63         mutex_lock(&priv->alloc_mutex);
  64         original_node = dev_to_node(&dev->pdev->dev);
  65         set_dev_node(&dev->pdev->dev, node);
  66         cpu_handle = dma_zalloc_coherent(&dev->pdev->dev, size,
  67                                          dma_handle, GFP_KERNEL);
  68         set_dev_node(&dev->pdev->dev, original_node);
  69         mutex_unlock(&priv->alloc_mutex);
  70         return cpu_handle;
  71 }
  72
  73 int mlx5_buf_alloc_node(struct mlx5_core_dev *dev, int size,
  74                         struct mlx5_buf *buf, int node)
  75 {
  76         dma_addr_t t;
  77
  78         buf->size = size;
  79         buf->npages       = 1;
  80         buf->page_shift   = (u8)get_order(size) + PAGE_SHIFT;
  81         buf->direct.buf   = mlx5_dma_zalloc_coherent_node(dev, size,
  82                                                           &t, node);
  83         if (!buf->direct.buf)
  84                 return -ENOMEM;
  85
  86         buf->direct.map = t;
  87
  88         while (t & ((1 << buf->page_shift) - 1)) {
  89                 --buf->page_shift;
  90                 buf->npages *= 2;
  91         }
  92
  93         return 0;
  94 }
  95
  96 int mlx5_buf_alloc(struct mlx5_core_dev *dev, int size, struct mlx5_buf *buf)
  97 {
  98         return mlx5_buf_alloc_node(dev, size, buf, dev->priv.numa_node);
  99 }
 100 EXPORT_SYMBOL_GPL(mlx5_buf_alloc);
 101
 102 void mlx5_buf_free(struct mlx5_core_dev *dev, struct mlx5_buf *buf)
 103 {
 104         dma_free_coherent(&dev->pdev->dev, buf->size, buf->direct.buf,
 105                           buf->direct.map);
 106 }
 107 EXPORT_SYMBOL_GPL(mlx5_buf_free);
 108
 109 int mlx5_frag_buf_alloc_node(struct mlx5_core_dev *dev, int size,
 110                              struct mlx5_frag_buf *buf, int node)
 111 {
 112         int i;
 113
 114         buf->size = size;
 115         buf->npages = 1 << get_order(size);
 116         buf->page_shift = PAGE_SHIFT;
 117         buf->frags = kcalloc(buf->npages, sizeof(struct mlx5_buf_list),
 118                              GFP_KERNEL);
 119         if (!buf->frags)
 120                 goto err_out;
 121
 122         for (i = 0; i < buf->npages; i++) {
 123                 struct mlx5_buf_list *frag = &buf->frags[i];
 124                 int frag_sz = min_t(int, size, PAGE_SIZE);
 125
 126                 frag->buf = mlx5_dma_zalloc_coherent_node(dev, frag_sz,
 127                                                           &frag->map, node);
 128                 if (!frag->buf)
 129                         goto err_free_buf;
 130                 if (frag->map & ((1 << buf->page_shift) - 1)) {
 131                         dma_free_coherent(&dev->pdev->dev, frag_sz,
 132                                           buf->frags[i].buf, buf->frags[i].map);
 133                         mlx5_core_warn(dev, "unexpected map alignment: %pad, page_shift=%d\n",
 134                                        &frag->map, buf->page_shift);
 135                         goto err_free_buf;
 136                 }
 137                 size -= frag_sz;
 138         }
 139
 140         return 0;
 141
 142 err_free_buf:
 143         while (i--)
 144                 dma_free_coherent(&dev->pdev->dev, PAGE_SIZE, buf->frags[i].buf,
 145                                   buf->frags[i].map);
 146         kfree(buf->frags);
 147 err_out:
 148         return -ENOMEM;
 149 }
 150
 151 void mlx5_frag_buf_free(struct mlx5_core_dev *dev, struct mlx5_frag_buf *buf)
 152 {
 153         int size = buf->size;
 154         int i;
 155
 156         for (i = 0; i < buf->npages; i++) {
 157                 int frag_sz = min_t(int, size, PAGE_SIZE);
 158
 159                 dma_free_coherent(&dev->pdev->dev, frag_sz, buf->frags[i].buf,
 160                                   buf->frags[i].map);
 161                 size -= frag_sz;
 162         }
 163         kfree(buf->frags);
 164 }
 165
 166 static struct mlx5_db_pgdir *mlx5_alloc_db_pgdir(struct mlx5_core_dev *dev,
 167                                                  int node)
 168 {
 169         u32 db_per_page = PAGE_SIZE / cache_line_size();
 170         struct mlx5_db_pgdir *pgdir;
 171
 172         pgdir = kzalloc(sizeof(*pgdir), GFP_KERNEL);
 173         if (!pgdir)
 174                 return NULL;
 175
 176         pgdir->bitmap = kcalloc(BITS_TO_LONGS(db_per_page),
 177                                 sizeof(unsigned long),
 178                                 GFP_KERNEL);
 179
 180         if (!pgdir->bitmap) {
 181                 kfree(pgdir);
 182                 return NULL;
 183         }
 184
 185         bitmap_fill(pgdir->bitmap, db_per_page);
 186
 187         pgdir->db_page = mlx5_dma_zalloc_coherent_node(dev, PAGE_SIZE,
 188                                                        &pgdir->db_dma, node);
 189         if (!pgdir->db_page) {
 190                 kfree(pgdir->bitmap);
 191                 kfree(pgdir);
 192                 return NULL;
 193         }
 194
 195         return pgdir;
 196 }
 197
 198 static int mlx5_alloc_db_from_pgdir(struct mlx5_db_pgdir *pgdir,
 199                                     struct mlx5_db *db)
 200 {
 201         u32 db_per_page = PAGE_SIZE / cache_line_size();
 202         int offset;
 203         int i;
 204
 205         i = find_first_bit(pgdir->bitmap, db_per_page);
 206         if (i >= db_per_page)
 207                 return -ENOMEM;
 208
 209         __clear_bit(i, pgdir->bitmap);
 210
 211         db->u.pgdir = pgdir;
 212         db->index   = i;
 213         offset = db->index * cache_line_size();
 214         db->db      = pgdir->db_page + offset / sizeof(*pgdir->db_page);
 215         db->dma     = pgdir->db_dma  + offset;
 216
 217         db->db[0] = 0;
 218         db->db[1] = 0;
 219
 220         return 0;
 221 }
 222
 223 int mlx5_db_alloc_node(struct mlx5_core_dev *dev, struct mlx5_db *db, int node)
 224 {
 225         struct mlx5_db_pgdir *pgdir;
 226         int ret = 0;
 227
 228         mutex_lock(&dev->priv.pgdir_mutex);
 229
 230         list_for_each_entry(pgdir, &dev->priv.pgdir_list, list)
 231                 if (!mlx5_alloc_db_from_pgdir(pgdir, db))
 232                         goto out;
 233
 234         pgdir = mlx5_alloc_db_pgdir(dev, node);
 235         if (!pgdir) {
 236                 ret = -ENOMEM;
 237                 goto out;
 238         }
 239
 240         list_add(&pgdir->list, &dev->priv.pgdir_list);
 241
 242         /* This should never fail -- we just allocated an empty page: */
 243         WARN_ON(mlx5_alloc_db_from_pgdir(pgdir, db));
 244
 245 out:
 246         mutex_unlock(&dev->priv.pgdir_mutex);
 247
 248         return ret;
 249 }
 250 EXPORT_SYMBOL_GPL(mlx5_db_alloc_node);
 251
 252 int mlx5_db_alloc(struct mlx5_core_dev *dev, struct mlx5_db *db)
 253 {
 254         return mlx5_db_alloc_node(dev, db, dev->priv.numa_node);
 255 }
 256 EXPORT_SYMBOL_GPL(mlx5_db_alloc);
 257
 258 void mlx5_db_free(struct mlx5_core_dev *dev, struct mlx5_db *db)
 259 {
 260         u32 db_per_page = PAGE_SIZE / cache_line_size();
 261
 262         mutex_lock(&dev->priv.pgdir_mutex);
 263
 264         __set_bit(db->index, db->u.pgdir->bitmap);
 265
 266         if (bitmap_full(db->u.pgdir->bitmap, db_per_page)) {
 267                 dma_free_coherent(&(dev->pdev->dev), PAGE_SIZE,
 268                                   db->u.pgdir->db_page, db->u.pgdir->db_dma);
 269                 list_del(&db->u.pgdir->list);
 270                 kfree(db->u.pgdir->bitmap);
 271                 kfree(db->u.pgdir);
 272         }
 273
 274         mutex_unlock(&dev->priv.pgdir_mutex);
 275 }
 276 EXPORT_SYMBOL_GPL(mlx5_db_free);
 277
 278 void mlx5_fill_page_array(struct mlx5_buf *buf, __be64 *pas)
 279 {
 280         u64 addr;
 281         int i;
 282
 283         for (i = 0; i < buf->npages; i++) {
 284                 addr = buf->direct.map + (i << buf->page_shift);
 285
 286                 pas[i] = cpu_to_be64(addr);
 287         }
 288 }
 289 EXPORT_SYMBOL_GPL(mlx5_fill_page_array);
 290
 291 void mlx5_fill_page_frag_array(struct mlx5_frag_buf *buf, __be64 *pas)
 292 {
 293         int i;
 294
 295         for (i = 0; i < buf->npages; i++)
 296                 pas[i] = cpu_to_be64(buf->frags[i].map);
 297 }
 298 EXPORT_SYMBOL_GPL(mlx5_fill_page_frag_array);