drivers/net/ethernet/mellanox/mlx4/icm.c

   1 /*
   2  * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved.
   3  * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/errno.h>
  35 #include <linux/mm.h>
  36 #include <linux/scatterlist.h>
  37 #include <linux/slab.h>
  38
  39 #include <linux/mlx4/cmd.h>
  40
  41 #include "mlx4.h"
  42 #include "icm.h"
  43 #include "fw.h"
  44
  45 /*
  46  * We allocate in as big chunks as we can, up to a maximum of 256 KB
  47  * per chunk. Note that the chunks are not necessarily in contiguous
  48  * physical memory.
  49  */
  50 enum {
  51         MLX4_ICM_ALLOC_SIZE     = 1 << 18,
  52         MLX4_TABLE_CHUNK_SIZE   = 1 << 18,
  53 };
  54
  55 static void mlx4_free_icm_pages(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk)
  56 {
  57         int i;
  58
  59         if (chunk->nsg > 0)
  60                 pci_unmap_sg(dev->persist->pdev, chunk->mem, chunk->npages,
  61                              PCI_DMA_BIDIRECTIONAL);
  62
  63         for (i = 0; i < chunk->npages; ++i)
  64                 __free_pages(sg_page(&chunk->mem[i]),
  65                              get_order(chunk->mem[i].length));
  66 }
  67
  68 static void mlx4_free_icm_coherent(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk)
  69 {
  70         int i;
  71
  72         for (i = 0; i < chunk->npages; ++i)
  73                 dma_free_coherent(&dev->persist->pdev->dev,
  74                                   chunk->mem[i].length,
  75                                   lowmem_page_address(sg_page(&chunk->mem[i])),
  76                                   sg_dma_address(&chunk->mem[i]));
  77 }
  78
  79 void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent)
  80 {
  81         struct mlx4_icm_chunk *chunk, *tmp;
  82
  83         if (!icm)
  84                 return;
  85
  86         list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
  87                 if (coherent)
  88                         mlx4_free_icm_coherent(dev, chunk);
  89                 else
  90                         mlx4_free_icm_pages(dev, chunk);
  91
  92                 kfree(chunk);
  93         }
  94
  95         kfree(icm);
  96 }
  97
  98 static int mlx4_alloc_icm_pages(struct scatterlist *mem, int order,
  99                                 gfp_t gfp_mask, int node)
 100 {
 101         struct page *page;
 102
 103         page = alloc_pages_node(node, gfp_mask, order);
 104         if (!page) {
 105                 page = alloc_pages(gfp_mask, order);
 106                 if (!page)
 107                         return -ENOMEM;
 108         }
 109
 110         sg_set_page(mem, page, PAGE_SIZE << order, 0);
 111         return 0;
 112 }
 113
 114 static int mlx4_alloc_icm_coherent(struct device *dev, struct scatterlist *mem,
 115                                     int order, gfp_t gfp_mask)
 116 {
 117         void *buf = dma_alloc_coherent(dev, PAGE_SIZE << order,
 118                                        &sg_dma_address(mem), gfp_mask);
 119         if (!buf)
 120                 return -ENOMEM;
 121
 122         if (offset_in_page(buf)) {
 123                 dma_free_coherent(dev, PAGE_SIZE << order,
 124                                   buf, sg_dma_address(mem));
 125                 return -ENOMEM;
 126         }
 127
 128         sg_set_buf(mem, buf, PAGE_SIZE << order);
 129         sg_dma_len(mem) = PAGE_SIZE << order;
 130         return 0;
 131 }
 132
 133 struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
 134                                 gfp_t gfp_mask, int coherent)
 135 {
 136         struct mlx4_icm *icm;
 137         struct mlx4_icm_chunk *chunk = NULL;
 138         int cur_order;
 139         gfp_t mask;
 140         int ret;
 141
 142         /* We use sg_set_buf for coherent allocs, which assumes low memory */
 143         BUG_ON(coherent && (gfp_mask & __GFP_HIGHMEM));
 144
 145         icm = kmalloc_node(sizeof(*icm),
 146                            gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN),
 147                            dev->numa_node);
 148         if (!icm) {
 149                 icm = kmalloc(sizeof(*icm),
 150                               gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
 151                 if (!icm)
 152                         return NULL;
 153         }
 154
 155         icm->refcount = 0;
 156         INIT_LIST_HEAD(&icm->chunk_list);
 157
 158         cur_order = get_order(MLX4_ICM_ALLOC_SIZE);
 159
 160         while (npages > 0) {
 161                 if (!chunk) {
 162                         chunk = kmalloc_node(sizeof(*chunk),
 163                                              gfp_mask & ~(__GFP_HIGHMEM |
 164                                                           __GFP_NOWARN),
 165                                              dev->numa_node);
 166                         if (!chunk) {
 167                                 chunk = kmalloc(sizeof(*chunk),
 168                                                 gfp_mask & ~(__GFP_HIGHMEM |
 169                                                              __GFP_NOWARN));
 170                                 if (!chunk)
 171                                         goto fail;
 172                         }
 173
 174                         sg_init_table(chunk->mem, MLX4_ICM_CHUNK_LEN);
 175                         chunk->npages = 0;
 176                         chunk->nsg    = 0;
 177                         list_add_tail(&chunk->list, &icm->chunk_list);
 178                 }
 179
 180                 while (1 << cur_order > npages)
 181                         --cur_order;
 182
 183                 mask = gfp_mask;
 184                 if (cur_order)
 185                         mask &= ~__GFP_DIRECT_RECLAIM;
 186
 187                 if (coherent)
 188                         ret = mlx4_alloc_icm_coherent(&dev->persist->pdev->dev,
 189                                                       &chunk->mem[chunk->npages],
 190                                                       cur_order, mask);
 191                 else
 192                         ret = mlx4_alloc_icm_pages(&chunk->mem[chunk->npages],
 193                                                    cur_order, mask,
 194                                                    dev->numa_node);
 195
 196                 if (ret) {
 197                         if (--cur_order < 0)
 198                                 goto fail;
 199                         else
 200                                 continue;
 201                 }
 202
 203                 ++chunk->npages;
 204
 205                 if (coherent)
 206                         ++chunk->nsg;
 207                 else if (chunk->npages == MLX4_ICM_CHUNK_LEN) {
 208                         chunk->nsg = pci_map_sg(dev->persist->pdev, chunk->mem,
 209                                                 chunk->npages,
 210                                                 PCI_DMA_BIDIRECTIONAL);
 211
 212                         if (chunk->nsg <= 0)
 213                                 goto fail;
 214                 }
 215
 216                 if (chunk->npages == MLX4_ICM_CHUNK_LEN)
 217                         chunk = NULL;
 218
 219                 npages -= 1 << cur_order;
 220         }
 221
 222         if (!coherent && chunk) {
 223                 chunk->nsg = pci_map_sg(dev->persist->pdev, chunk->mem,
 224                                         chunk->npages,
 225                                         PCI_DMA_BIDIRECTIONAL);
 226
 227                 if (chunk->nsg <= 0)
 228                         goto fail;
 229         }
 230
 231         return icm;
 232
 233 fail:
 234         mlx4_free_icm(dev, icm, coherent);
 235         return NULL;
 236 }
 237
 238 static int mlx4_MAP_ICM(struct mlx4_dev *dev, struct mlx4_icm *icm, u64 virt)
 239 {
 240         return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM, icm, virt);
 241 }
 242
 243 static int mlx4_UNMAP_ICM(struct mlx4_dev *dev, u64 virt, u32 page_count)
 244 {
 245         return mlx4_cmd(dev, virt, page_count, 0, MLX4_CMD_UNMAP_ICM,
 246                         MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
 247 }
 248
 249 int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm)
 250 {
 251         return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM_AUX, icm, -1);
 252 }
 253
 254 int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev)
 255 {
 256         return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_UNMAP_ICM_AUX,
 257                         MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
 258 }
 259
 260 int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj)
 261 {
 262         u32 i = (obj & (table->num_obj - 1)) /
 263                         (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
 264         int ret = 0;
 265
 266         mutex_lock(&table->mutex);
 267
 268         if (table->icm[i]) {
 269                 ++table->icm[i]->refcount;
 270                 goto out;
 271         }
 272
 273         table->icm[i] = mlx4_alloc_icm(dev, MLX4_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
 274                                        (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
 275                                        __GFP_NOWARN, table->coherent);
 276         if (!table->icm[i]) {
 277                 ret = -ENOMEM;
 278                 goto out;
 279         }
 280
 281         if (mlx4_MAP_ICM(dev, table->icm[i], table->virt +
 282                          (u64) i * MLX4_TABLE_CHUNK_SIZE)) {
 283                 mlx4_free_icm(dev, table->icm[i], table->coherent);
 284                 table->icm[i] = NULL;
 285                 ret = -ENOMEM;
 286                 goto out;
 287         }
 288
 289         ++table->icm[i]->refcount;
 290
 291 out:
 292         mutex_unlock(&table->mutex);
 293         return ret;
 294 }
 295
 296 void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj)
 297 {
 298         u32 i;
 299         u64 offset;
 300
 301         i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
 302
 303         mutex_lock(&table->mutex);
 304
 305         if (--table->icm[i]->refcount == 0) {
 306                 offset = (u64) i * MLX4_TABLE_CHUNK_SIZE;
 307                 mlx4_UNMAP_ICM(dev, table->virt + offset,
 308                                MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 309                 mlx4_free_icm(dev, table->icm[i], table->coherent);
 310                 table->icm[i] = NULL;
 311         }
 312
 313         mutex_unlock(&table->mutex);
 314 }
 315
 316 void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj,
 317                         dma_addr_t *dma_handle)
 318 {
 319         int offset, dma_offset, i;
 320         u64 idx;
 321         struct mlx4_icm_chunk *chunk;
 322         struct mlx4_icm *icm;
 323         struct page *page = NULL;
 324
 325         if (!table->lowmem)
 326                 return NULL;
 327
 328         mutex_lock(&table->mutex);
 329
 330         idx = (u64) (obj & (table->num_obj - 1)) * table->obj_size;
 331         icm = table->icm[idx / MLX4_TABLE_CHUNK_SIZE];
 332         dma_offset = offset = idx % MLX4_TABLE_CHUNK_SIZE;
 333
 334         if (!icm)
 335                 goto out;
 336
 337         list_for_each_entry(chunk, &icm->chunk_list, list) {
 338                 for (i = 0; i < chunk->npages; ++i) {
 339                         if (dma_handle && dma_offset >= 0) {
 340                                 if (sg_dma_len(&chunk->mem[i]) > dma_offset)
 341                                         *dma_handle = sg_dma_address(&chunk->mem[i]) +
 342                                                 dma_offset;
 343                                 dma_offset -= sg_dma_len(&chunk->mem[i]);
 344                         }
 345                         /*
 346                          * DMA mapping can merge pages but not split them,
 347                          * so if we found the page, dma_handle has already
 348                          * been assigned to.
 349                          */
 350                         if (chunk->mem[i].length > offset) {
 351                                 page = sg_page(&chunk->mem[i]);
 352                                 goto out;
 353                         }
 354                         offset -= chunk->mem[i].length;
 355                 }
 356         }
 357
 358 out:
 359         mutex_unlock(&table->mutex);
 360         return page ? lowmem_page_address(page) + offset : NULL;
 361 }
 362
 363 int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 364                          u32 start, u32 end)
 365 {
 366         int inc = MLX4_TABLE_CHUNK_SIZE / table->obj_size;
 367         int err;
 368         u32 i;
 369
 370         for (i = start; i <= end; i += inc) {
 371                 err = mlx4_table_get(dev, table, i);
 372                 if (err)
 373                         goto fail;
 374         }
 375
 376         return 0;
 377
 378 fail:
 379         while (i > start) {
 380                 i -= inc;
 381                 mlx4_table_put(dev, table, i);
 382         }
 383
 384         return err;
 385 }
 386
 387 void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 388                           u32 start, u32 end)
 389 {
 390         u32 i;
 391
 392         for (i = start; i <= end; i += MLX4_TABLE_CHUNK_SIZE / table->obj_size)
 393                 mlx4_table_put(dev, table, i);
 394 }
 395
 396 int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 397                         u64 virt, int obj_size, u32 nobj, int reserved,
 398                         int use_lowmem, int use_coherent)
 399 {
 400         int obj_per_chunk;
 401         int num_icm;
 402         unsigned chunk_size;
 403         int i;
 404         u64 size;
 405
 406         obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size;
 407         if (WARN_ON(!obj_per_chunk))
 408                 return -EINVAL;
 409         num_icm = DIV_ROUND_UP(nobj, obj_per_chunk);
 410
 411         table->icm      = kvcalloc(num_icm, sizeof(*table->icm), GFP_KERNEL);
 412         if (!table->icm)
 413                 return -ENOMEM;
 414         table->virt     = virt;
 415         table->num_icm  = num_icm;
 416         table->num_obj  = nobj;
 417         table->obj_size = obj_size;
 418         table->lowmem   = use_lowmem;
 419         table->coherent = use_coherent;
 420         mutex_init(&table->mutex);
 421
 422         size = (u64) nobj * obj_size;
 423         for (i = 0; i * MLX4_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
 424                 chunk_size = MLX4_TABLE_CHUNK_SIZE;
 425                 if ((i + 1) * MLX4_TABLE_CHUNK_SIZE > size)
 426                         chunk_size = PAGE_ALIGN(size -
 427                                         i * MLX4_TABLE_CHUNK_SIZE);
 428
 429                 table->icm[i] = mlx4_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
 430                                                (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
 431                                                __GFP_NOWARN, use_coherent);
 432                 if (!table->icm[i])
 433                         goto err;
 434                 if (mlx4_MAP_ICM(dev, table->icm[i], virt + i * MLX4_TABLE_CHUNK_SIZE)) {
 435                         mlx4_free_icm(dev, table->icm[i], use_coherent);
 436                         table->icm[i] = NULL;
 437                         goto err;
 438                 }
 439
 440                 /*
 441                  * Add a reference to this ICM chunk so that it never
 442                  * gets freed (since it contains reserved firmware objects).
 443                  */
 444                 ++table->icm[i]->refcount;
 445         }
 446
 447         return 0;
 448
 449 err:
 450         for (i = 0; i < num_icm; ++i)
 451                 if (table->icm[i]) {
 452                         mlx4_UNMAP_ICM(dev, virt + i * MLX4_TABLE_CHUNK_SIZE,
 453                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 454                         mlx4_free_icm(dev, table->icm[i], use_coherent);
 455                 }
 456
 457         kvfree(table->icm);
 458
 459         return -ENOMEM;
 460 }
 461
 462 void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table)
 463 {
 464         int i;
 465
 466         for (i = 0; i < table->num_icm; ++i)
 467                 if (table->icm[i]) {
 468                         mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
 469                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 470                         mlx4_free_icm(dev, table->icm[i], table->coherent);
 471                 }
 472
 473         kvfree(table->icm);
 474 }