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.
  48  */
  49 enum {
  50         MLX4_ICM_ALLOC_SIZE     = 1 << 18,
  51         MLX4_TABLE_CHUNK_SIZE   = 1 << 18
  52 };
  53
  54 static void mlx4_free_icm_pages(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk)
  55 {
  56         int i;
  57
  58         if (chunk->nsg > 0)
  59                 pci_unmap_sg(dev->persist->pdev, chunk->mem, chunk->npages,
  60                              PCI_DMA_BIDIRECTIONAL);
  61
  62         for (i = 0; i < chunk->npages; ++i)
  63                 __free_pages(sg_page(&chunk->mem[i]),
  64                              get_order(chunk->mem[i].length));
  65 }
  66
  67 static void mlx4_free_icm_coherent(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk)
  68 {
  69         int i;
  70
  71         for (i = 0; i < chunk->npages; ++i)
  72                 dma_free_coherent(&dev->persist->pdev->dev,
  73                                   chunk->mem[i].length,
  74                                   lowmem_page_address(sg_page(&chunk->mem[i])),
  75                                   sg_dma_address(&chunk->mem[i]));
  76 }
  77
  78 void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent)
  79 {
  80         struct mlx4_icm_chunk *chunk, *tmp;
  81
  82         if (!icm)
  83                 return;
  84
  85         list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
  86                 if (coherent)
  87                         mlx4_free_icm_coherent(dev, chunk);
  88                 else
  89                         mlx4_free_icm_pages(dev, chunk);
  90
  91                 kfree(chunk);
  92         }
  93
  94         kfree(icm);
  95 }
  96
  97 static int mlx4_alloc_icm_pages(struct scatterlist *mem, int order,
  98                                 gfp_t gfp_mask, int node)
  99 {
 100         struct page *page;
 101
 102         page = alloc_pages_node(node, gfp_mask, order);
 103         if (!page) {
 104                 page = alloc_pages(gfp_mask, order);
 105                 if (!page)
 106                         return -ENOMEM;
 107         }
 108
 109         sg_set_page(mem, page, PAGE_SIZE << order, 0);
 110         return 0;
 111 }
 112
 113 static int mlx4_alloc_icm_coherent(struct device *dev, struct scatterlist *mem,
 114                                     int order, gfp_t gfp_mask)
 115 {
 116         void *buf = dma_alloc_coherent(dev, PAGE_SIZE << order,
 117                                        &sg_dma_address(mem), gfp_mask);
 118         if (!buf)
 119                 return -ENOMEM;
 120
 121         if (offset_in_page(buf)) {
 122                 dma_free_coherent(dev, PAGE_SIZE << order,
 123                                   buf, sg_dma_address(mem));
 124                 return -ENOMEM;
 125         }
 126
 127         sg_set_buf(mem, buf, PAGE_SIZE << order);
 128         sg_dma_len(mem) = PAGE_SIZE << order;
 129         return 0;
 130 }
 131
 132 struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
 133                                 gfp_t gfp_mask, int coherent)
 134 {
 135         struct mlx4_icm *icm;
 136         struct mlx4_icm_chunk *chunk = NULL;
 137         int cur_order;
 138         int ret;
 139
 140         /* We use sg_set_buf for coherent allocs, which assumes low memory */
 141         BUG_ON(coherent && (gfp_mask & __GFP_HIGHMEM));
 142
 143         icm = kmalloc_node(sizeof(*icm),
 144                            gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN),
 145                            dev->numa_node);
 146         if (!icm) {
 147                 icm = kmalloc(sizeof(*icm),
 148                               gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
 149                 if (!icm)
 150                         return NULL;
 151         }
 152
 153         icm->refcount = 0;
 154         INIT_LIST_HEAD(&icm->chunk_list);
 155
 156         cur_order = get_order(MLX4_ICM_ALLOC_SIZE);
 157
 158         while (npages > 0) {
 159                 if (!chunk) {
 160                         chunk = kmalloc_node(sizeof(*chunk),
 161                                              gfp_mask & ~(__GFP_HIGHMEM |
 162                                                           __GFP_NOWARN),
 163                                              dev->numa_node);
 164                         if (!chunk) {
 165                                 chunk = kmalloc(sizeof(*chunk),
 166                                                 gfp_mask & ~(__GFP_HIGHMEM |
 167                                                              __GFP_NOWARN));
 168                                 if (!chunk)
 169                                         goto fail;
 170                         }
 171
 172                         sg_init_table(chunk->mem, MLX4_ICM_CHUNK_LEN);
 173                         chunk->npages = 0;
 174                         chunk->nsg    = 0;
 175                         list_add_tail(&chunk->list, &icm->chunk_list);
 176                 }
 177
 178                 while (1 << cur_order > npages)
 179                         --cur_order;
 180
 181                 if (coherent)
 182                         ret = mlx4_alloc_icm_coherent(&dev->persist->pdev->dev,
 183                                                       &chunk->mem[chunk->npages],
 184                                                       cur_order, gfp_mask);
 185                 else
 186                         ret = mlx4_alloc_icm_pages(&chunk->mem[chunk->npages],
 187                                                    cur_order, gfp_mask,
 188                                                    dev->numa_node);
 189
 190                 if (ret) {
 191                         if (--cur_order < 0)
 192                                 goto fail;
 193                         else
 194                                 continue;
 195                 }
 196
 197                 ++chunk->npages;
 198
 199                 if (coherent)
 200                         ++chunk->nsg;
 201                 else if (chunk->npages == MLX4_ICM_CHUNK_LEN) {
 202                         chunk->nsg = pci_map_sg(dev->persist->pdev, chunk->mem,
 203                                                 chunk->npages,
 204                                                 PCI_DMA_BIDIRECTIONAL);
 205
 206                         if (chunk->nsg <= 0)
 207                                 goto fail;
 208                 }
 209
 210                 if (chunk->npages == MLX4_ICM_CHUNK_LEN)
 211                         chunk = NULL;
 212
 213                 npages -= 1 << cur_order;
 214         }
 215
 216         if (!coherent && chunk) {
 217                 chunk->nsg = pci_map_sg(dev->persist->pdev, chunk->mem,
 218                                         chunk->npages,
 219                                         PCI_DMA_BIDIRECTIONAL);
 220
 221                 if (chunk->nsg <= 0)
 222                         goto fail;
 223         }
 224
 225         return icm;
 226
 227 fail:
 228         mlx4_free_icm(dev, icm, coherent);
 229         return NULL;
 230 }
 231
 232 static int mlx4_MAP_ICM(struct mlx4_dev *dev, struct mlx4_icm *icm, u64 virt)
 233 {
 234         return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM, icm, virt);
 235 }
 236
 237 static int mlx4_UNMAP_ICM(struct mlx4_dev *dev, u64 virt, u32 page_count)
 238 {
 239         return mlx4_cmd(dev, virt, page_count, 0, MLX4_CMD_UNMAP_ICM,
 240                         MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
 241 }
 242
 243 int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm)
 244 {
 245         return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM_AUX, icm, -1);
 246 }
 247
 248 int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev)
 249 {
 250         return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_UNMAP_ICM_AUX,
 251                         MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
 252 }
 253
 254 int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj)
 255 {
 256         u32 i = (obj & (table->num_obj - 1)) /
 257                         (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
 258         int ret = 0;
 259
 260         mutex_lock(&table->mutex);
 261
 262         if (table->icm[i]) {
 263                 ++table->icm[i]->refcount;
 264                 goto out;
 265         }
 266
 267         table->icm[i] = mlx4_alloc_icm(dev, MLX4_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
 268                                        (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
 269                                        __GFP_NOWARN, table->coherent);
 270         if (!table->icm[i]) {
 271                 ret = -ENOMEM;
 272                 goto out;
 273         }
 274
 275         if (mlx4_MAP_ICM(dev, table->icm[i], table->virt +
 276                          (u64) i * MLX4_TABLE_CHUNK_SIZE)) {
 277                 mlx4_free_icm(dev, table->icm[i], table->coherent);
 278                 table->icm[i] = NULL;
 279                 ret = -ENOMEM;
 280                 goto out;
 281         }
 282
 283         ++table->icm[i]->refcount;
 284
 285 out:
 286         mutex_unlock(&table->mutex);
 287         return ret;
 288 }
 289
 290 void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj)
 291 {
 292         u32 i;
 293         u64 offset;
 294
 295         i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
 296
 297         mutex_lock(&table->mutex);
 298
 299         if (--table->icm[i]->refcount == 0) {
 300                 offset = (u64) i * MLX4_TABLE_CHUNK_SIZE;
 301                 mlx4_UNMAP_ICM(dev, table->virt + offset,
 302                                MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 303                 mlx4_free_icm(dev, table->icm[i], table->coherent);
 304                 table->icm[i] = NULL;
 305         }
 306
 307         mutex_unlock(&table->mutex);
 308 }
 309
 310 void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj,
 311                         dma_addr_t *dma_handle)
 312 {
 313         int offset, dma_offset, i;
 314         u64 idx;
 315         struct mlx4_icm_chunk *chunk;
 316         struct mlx4_icm *icm;
 317         struct page *page = NULL;
 318
 319         if (!table->lowmem)
 320                 return NULL;
 321
 322         mutex_lock(&table->mutex);
 323
 324         idx = (u64) (obj & (table->num_obj - 1)) * table->obj_size;
 325         icm = table->icm[idx / MLX4_TABLE_CHUNK_SIZE];
 326         dma_offset = offset = idx % MLX4_TABLE_CHUNK_SIZE;
 327
 328         if (!icm)
 329                 goto out;
 330
 331         list_for_each_entry(chunk, &icm->chunk_list, list) {
 332                 for (i = 0; i < chunk->npages; ++i) {
 333                         if (dma_handle && dma_offset >= 0) {
 334                                 if (sg_dma_len(&chunk->mem[i]) > dma_offset)
 335                                         *dma_handle = sg_dma_address(&chunk->mem[i]) +
 336                                                 dma_offset;
 337                                 dma_offset -= sg_dma_len(&chunk->mem[i]);
 338                         }
 339                         /*
 340                          * DMA mapping can merge pages but not split them,
 341                          * so if we found the page, dma_handle has already
 342                          * been assigned to.
 343                          */
 344                         if (chunk->mem[i].length > offset) {
 345                                 page = sg_page(&chunk->mem[i]);
 346                                 goto out;
 347                         }
 348                         offset -= chunk->mem[i].length;
 349                 }
 350         }
 351
 352 out:
 353         mutex_unlock(&table->mutex);
 354         return page ? lowmem_page_address(page) + offset : NULL;
 355 }
 356
 357 int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 358                          u32 start, u32 end)
 359 {
 360         int inc = MLX4_TABLE_CHUNK_SIZE / table->obj_size;
 361         int err;
 362         u32 i;
 363
 364         for (i = start; i <= end; i += inc) {
 365                 err = mlx4_table_get(dev, table, i);
 366                 if (err)
 367                         goto fail;
 368         }
 369
 370         return 0;
 371
 372 fail:
 373         while (i > start) {
 374                 i -= inc;
 375                 mlx4_table_put(dev, table, i);
 376         }
 377
 378         return err;
 379 }
 380
 381 void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 382                           u32 start, u32 end)
 383 {
 384         u32 i;
 385
 386         for (i = start; i <= end; i += MLX4_TABLE_CHUNK_SIZE / table->obj_size)
 387                 mlx4_table_put(dev, table, i);
 388 }
 389
 390 int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 391                         u64 virt, int obj_size, u32 nobj, int reserved,
 392                         int use_lowmem, int use_coherent)
 393 {
 394         int obj_per_chunk;
 395         int num_icm;
 396         unsigned chunk_size;
 397         int i;
 398         u64 size;
 399
 400         obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size;
 401         num_icm = (nobj + obj_per_chunk - 1) / obj_per_chunk;
 402
 403         table->icm      = kcalloc(num_icm, sizeof *table->icm, GFP_KERNEL);
 404         if (!table->icm)
 405                 return -ENOMEM;
 406         table->virt     = virt;
 407         table->num_icm  = num_icm;
 408         table->num_obj  = nobj;
 409         table->obj_size = obj_size;
 410         table->lowmem   = use_lowmem;
 411         table->coherent = use_coherent;
 412         mutex_init(&table->mutex);
 413
 414         size = (u64) nobj * obj_size;
 415         for (i = 0; i * MLX4_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
 416                 chunk_size = MLX4_TABLE_CHUNK_SIZE;
 417                 if ((i + 1) * MLX4_TABLE_CHUNK_SIZE > size)
 418                         chunk_size = PAGE_ALIGN(size -
 419                                         i * MLX4_TABLE_CHUNK_SIZE);
 420
 421                 table->icm[i] = mlx4_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
 422                                                (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
 423                                                __GFP_NOWARN, use_coherent);
 424                 if (!table->icm[i])
 425                         goto err;
 426                 if (mlx4_MAP_ICM(dev, table->icm[i], virt + i * MLX4_TABLE_CHUNK_SIZE)) {
 427                         mlx4_free_icm(dev, table->icm[i], use_coherent);
 428                         table->icm[i] = NULL;
 429                         goto err;
 430                 }
 431
 432                 /*
 433                  * Add a reference to this ICM chunk so that it never
 434                  * gets freed (since it contains reserved firmware objects).
 435                  */
 436                 ++table->icm[i]->refcount;
 437         }
 438
 439         return 0;
 440
 441 err:
 442         for (i = 0; i < num_icm; ++i)
 443                 if (table->icm[i]) {
 444                         mlx4_UNMAP_ICM(dev, virt + i * MLX4_TABLE_CHUNK_SIZE,
 445                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 446                         mlx4_free_icm(dev, table->icm[i], use_coherent);
 447                 }
 448
 449         kfree(table->icm);
 450
 451         return -ENOMEM;
 452 }
 453
 454 void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table)
 455 {
 456         int i;
 457
 458         for (i = 0; i < table->num_icm; ++i)
 459                 if (table->icm[i]) {
 460                         mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
 461                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 462                         mlx4_free_icm(dev, table->icm[i], table->coherent);
 463                 }
 464
 465         kfree(table->icm);
 466 }