drivers/net/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                         ++chunk->npages;
 168
 169                         if (coherent)
 170                                 ++chunk->nsg;
 171                         else if (chunk->npages == MLX4_ICM_CHUNK_LEN) {
 172                                 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
 173                                                         chunk->npages,
 174                                                         PCI_DMA_BIDIRECTIONAL);
 175
 176                                 if (chunk->nsg <= 0)
 177                                         goto fail;
 178
 179                                 chunk = NULL;
 180                         }
 181
 182                         npages -= 1 << cur_order;
 183                 } else {
 184                         --cur_order;
 185                         if (cur_order < 0)
 186                                 goto fail;
 187                 }
 188         }
 189
 190         if (!coherent && chunk) {
 191                 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
 192                                         chunk->npages,
 193                                         PCI_DMA_BIDIRECTIONAL);
 194
 195                 if (chunk->nsg <= 0)
 196                         goto fail;
 197         }
 198
 199         return icm;
 200
 201 fail:
 202         mlx4_free_icm(dev, icm, coherent);
 203         return NULL;
 204 }
 205
 206 static int mlx4_MAP_ICM(struct mlx4_dev *dev, struct mlx4_icm *icm, u64 virt)
 207 {
 208         return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM, icm, virt);
 209 }
 210
 211 int mlx4_UNMAP_ICM(struct mlx4_dev *dev, u64 virt, u32 page_count)
 212 {
 213         return mlx4_cmd(dev, virt, page_count, 0, MLX4_CMD_UNMAP_ICM,
 214                         MLX4_CMD_TIME_CLASS_B);
 215 }
 216
 217 int mlx4_MAP_ICM_page(struct mlx4_dev *dev, u64 dma_addr, u64 virt)
 218 {
 219         struct mlx4_cmd_mailbox *mailbox;
 220         __be64 *inbox;
 221         int err;
 222
 223         mailbox = mlx4_alloc_cmd_mailbox(dev);
 224         if (IS_ERR(mailbox))
 225                 return PTR_ERR(mailbox);
 226         inbox = mailbox->buf;
 227
 228         inbox[0] = cpu_to_be64(virt);
 229         inbox[1] = cpu_to_be64(dma_addr);
 230
 231         err = mlx4_cmd(dev, mailbox->dma, 1, 0, MLX4_CMD_MAP_ICM,
 232                        MLX4_CMD_TIME_CLASS_B);
 233
 234         mlx4_free_cmd_mailbox(dev, mailbox);
 235
 236         if (!err)
 237                 mlx4_dbg(dev, "Mapped page at %llx to %llx for ICM.\n",
 238                           (unsigned long long) dma_addr, (unsigned long long) virt);
 239
 240         return err;
 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, MLX4_CMD_TIME_CLASS_B);
 251 }
 252
 253 int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj)
 254 {
 255         int i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
 256         int ret = 0;
 257
 258         mutex_lock(&table->mutex);
 259
 260         if (table->icm[i]) {
 261                 ++table->icm[i]->refcount;
 262                 goto out;
 263         }
 264
 265         table->icm[i] = mlx4_alloc_icm(dev, MLX4_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
 266                                        (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
 267                                        __GFP_NOWARN, table->coherent);
 268         if (!table->icm[i]) {
 269                 ret = -ENOMEM;
 270                 goto out;
 271         }
 272
 273         if (mlx4_MAP_ICM(dev, table->icm[i], table->virt +
 274                          (u64) i * MLX4_TABLE_CHUNK_SIZE)) {
 275                 mlx4_free_icm(dev, table->icm[i], table->coherent);
 276                 table->icm[i] = NULL;
 277                 ret = -ENOMEM;
 278                 goto out;
 279         }
 280
 281         ++table->icm[i]->refcount;
 282
 283 out:
 284         mutex_unlock(&table->mutex);
 285         return ret;
 286 }
 287
 288 void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj)
 289 {
 290         int i;
 291
 292         i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
 293
 294         mutex_lock(&table->mutex);
 295
 296         if (--table->icm[i]->refcount == 0) {
 297                 mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
 298                                MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 299                 mlx4_free_icm(dev, table->icm[i], table->coherent);
 300                 table->icm[i] = NULL;
 301         }
 302
 303         mutex_unlock(&table->mutex);
 304 }
 305
 306 void *mlx4_table_find(struct mlx4_icm_table *table, int obj, dma_addr_t *dma_handle)
 307 {
 308         int idx, offset, dma_offset, i;
 309         struct mlx4_icm_chunk *chunk;
 310         struct mlx4_icm *icm;
 311         struct page *page = NULL;
 312
 313         if (!table->lowmem)
 314                 return NULL;
 315
 316         mutex_lock(&table->mutex);
 317
 318         idx = (obj & (table->num_obj - 1)) * table->obj_size;
 319         icm = table->icm[idx / MLX4_TABLE_CHUNK_SIZE];
 320         dma_offset = offset = idx % MLX4_TABLE_CHUNK_SIZE;
 321
 322         if (!icm)
 323                 goto out;
 324
 325         list_for_each_entry(chunk, &icm->chunk_list, list) {
 326                 for (i = 0; i < chunk->npages; ++i) {
 327                         if (dma_handle && dma_offset >= 0) {
 328                                 if (sg_dma_len(&chunk->mem[i]) > dma_offset)
 329                                         *dma_handle = sg_dma_address(&chunk->mem[i]) +
 330                                                 dma_offset;
 331                                 dma_offset -= sg_dma_len(&chunk->mem[i]);
 332                         }
 333                         /*
 334                          * DMA mapping can merge pages but not split them,
 335                          * so if we found the page, dma_handle has already
 336                          * been assigned to.
 337                          */
 338                         if (chunk->mem[i].length > offset) {
 339                                 page = sg_page(&chunk->mem[i]);
 340                                 goto out;
 341                         }
 342                         offset -= chunk->mem[i].length;
 343                 }
 344         }
 345
 346 out:
 347         mutex_unlock(&table->mutex);
 348         return page ? lowmem_page_address(page) + offset : NULL;
 349 }
 350
 351 int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 352                          int start, int end)
 353 {
 354         int inc = MLX4_TABLE_CHUNK_SIZE / table->obj_size;
 355         int i, err;
 356
 357         for (i = start; i <= end; i += inc) {
 358                 err = mlx4_table_get(dev, table, i);
 359                 if (err)
 360                         goto fail;
 361         }
 362
 363         return 0;
 364
 365 fail:
 366         while (i > start) {
 367                 i -= inc;
 368                 mlx4_table_put(dev, table, i);
 369         }
 370
 371         return err;
 372 }
 373
 374 void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 375                           int start, int end)
 376 {
 377         int i;
 378
 379         for (i = start; i <= end; i += MLX4_TABLE_CHUNK_SIZE / table->obj_size)
 380                 mlx4_table_put(dev, table, i);
 381 }
 382
 383 int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 384                         u64 virt, int obj_size, int nobj, int reserved,
 385                         int use_lowmem, int use_coherent)
 386 {
 387         int obj_per_chunk;
 388         int num_icm;
 389         unsigned chunk_size;
 390         int i;
 391
 392         obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size;
 393         num_icm = (nobj + obj_per_chunk - 1) / obj_per_chunk;
 394
 395         table->icm      = kcalloc(num_icm, sizeof *table->icm, GFP_KERNEL);
 396         if (!table->icm)
 397                 return -ENOMEM;
 398         table->virt     = virt;
 399         table->num_icm  = num_icm;
 400         table->num_obj  = nobj;
 401         table->obj_size = obj_size;
 402         table->lowmem   = use_lowmem;
 403         table->coherent = use_coherent;
 404         mutex_init(&table->mutex);
 405
 406         for (i = 0; i * MLX4_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
 407                 chunk_size = MLX4_TABLE_CHUNK_SIZE;
 408                 if ((i + 1) * MLX4_TABLE_CHUNK_SIZE > nobj * obj_size)
 409                         chunk_size = PAGE_ALIGN(nobj * obj_size - i * MLX4_TABLE_CHUNK_SIZE);
 410
 411                 table->icm[i] = mlx4_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
 412                                                (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
 413                                                __GFP_NOWARN, use_coherent);
 414                 if (!table->icm[i])
 415                         goto err;
 416                 if (mlx4_MAP_ICM(dev, table->icm[i], virt + i * MLX4_TABLE_CHUNK_SIZE)) {
 417                         mlx4_free_icm(dev, table->icm[i], use_coherent);
 418                         table->icm[i] = NULL;
 419                         goto err;
 420                 }
 421
 422                 /*
 423                  * Add a reference to this ICM chunk so that it never
 424                  * gets freed (since it contains reserved firmware objects).
 425                  */
 426                 ++table->icm[i]->refcount;
 427         }
 428
 429         return 0;
 430
 431 err:
 432         for (i = 0; i < num_icm; ++i)
 433                 if (table->icm[i]) {
 434                         mlx4_UNMAP_ICM(dev, virt + i * MLX4_TABLE_CHUNK_SIZE,
 435                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 436                         mlx4_free_icm(dev, table->icm[i], use_coherent);
 437                 }
 438
 439         return -ENOMEM;
 440 }
 441
 442 void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table)
 443 {
 444         int i;
 445
 446         for (i = 0; i < table->num_icm; ++i)
 447                 if (table->icm[i]) {
 448                         mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
 449                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 450                         mlx4_free_icm(dev, table->icm[i], table->coherent);
 451                 }
 452
 453         kfree(table->icm);
 454 }