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