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