sys/dev/mlx4/mlx4_core/mlx4_icm.c

   1 /*
   2  * Copyright (c) 2005, 2006, 2007, 2008, 2014 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 #include <linux/math64.h>
  39
  40 #include <dev/mlx4/cmd.h>
  41
  42 #include "mlx4.h"
  43 #include "icm.h"
  44 #include "fw.h"
  45
  46 /*
  47  * We allocate in as big chunks as we can, up to a maximum of 256 KB
  48  * per chunk.
  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         sg_set_buf(mem, buf, PAGE_SIZE << order);
 123         BUG_ON(mem->offset);
 124         sg_dma_len(mem) = PAGE_SIZE << order;
 125         return 0;
 126 }
 127
 128 struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
 129                                 gfp_t gfp_mask, int coherent)
 130 {
 131         struct mlx4_icm *icm;
 132         struct mlx4_icm_chunk *chunk = NULL;
 133         int cur_order;
 134         int ret;
 135
 136         /* We use sg_set_buf for coherent allocs, which assumes low memory */
 137         BUG_ON(coherent && (gfp_mask & __GFP_HIGHMEM));
 138
 139         icm = kmalloc_node(sizeof(*icm),
 140                            gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN),
 141                            dev->numa_node);
 142         if (!icm) {
 143                 icm = kmalloc(sizeof(*icm),
 144                               gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
 145                 if (!icm)
 146                         return NULL;
 147         }
 148
 149         icm->refcount = 0;
 150         INIT_LIST_HEAD(&icm->chunk_list);
 151
 152         cur_order = get_order(MLX4_ICM_ALLOC_SIZE);
 153
 154         while (npages > 0) {
 155                 if (!chunk) {
 156                         chunk = kmalloc_node(sizeof(*chunk),
 157                                              gfp_mask & ~(__GFP_HIGHMEM |
 158                                                           __GFP_NOWARN),
 159                                              dev->numa_node);
 160                         if (!chunk) {
 161                                 chunk = kmalloc(sizeof(*chunk),
 162                                                 gfp_mask & ~(__GFP_HIGHMEM |
 163                                                              __GFP_NOWARN));
 164                                 if (!chunk)
 165                                         goto fail;
 166                         }
 167
 168                         sg_init_table(chunk->mem, MLX4_ICM_CHUNK_LEN);
 169                         chunk->npages = 0;
 170                         chunk->nsg    = 0;
 171                         list_add_tail(&chunk->list, &icm->chunk_list);
 172                 }
 173
 174                 while (1 << cur_order > npages)
 175                         --cur_order;
 176
 177                 if (coherent)
 178                         ret = mlx4_alloc_icm_coherent(&dev->persist->pdev->dev,
 179                                                       &chunk->mem[chunk->npages],
 180                                                       cur_order, gfp_mask);
 181                 else
 182                         ret = mlx4_alloc_icm_pages(&chunk->mem[chunk->npages],
 183                                                    cur_order, gfp_mask,
 184                                                    dev->numa_node);
 185
 186                 if (ret) {
 187                         if (--cur_order < 0)
 188                                 goto fail;
 189                         else
 190                                 continue;
 191                 }
 192
 193                 ++chunk->npages;
 194
 195                 if (coherent)
 196                         ++chunk->nsg;
 197                 else if (chunk->npages == MLX4_ICM_CHUNK_LEN) {
 198                         chunk->nsg = pci_map_sg(dev->persist->pdev, chunk->mem,
 199                                                 chunk->npages,
 200                                                 PCI_DMA_BIDIRECTIONAL);
 201
 202                         if (chunk->nsg <= 0)
 203                                 goto fail;
 204                 }
 205
 206                 if (chunk->npages == MLX4_ICM_CHUNK_LEN)
 207                         chunk = NULL;
 208
 209                 npages -= 1 << cur_order;
 210         }
 211
 212         if (!coherent && chunk) {
 213                 chunk->nsg = pci_map_sg(dev->persist->pdev, chunk->mem,
 214                                         chunk->npages,
 215                                         PCI_DMA_BIDIRECTIONAL);
 216
 217                 if (chunk->nsg <= 0)
 218                         goto fail;
 219         }
 220
 221         return icm;
 222
 223 fail:
 224         mlx4_free_icm(dev, icm, coherent);
 225         return NULL;
 226 }
 227
 228 static int mlx4_MAP_ICM(struct mlx4_dev *dev, struct mlx4_icm *icm, u64 virt)
 229 {
 230         return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM, icm, virt);
 231 }
 232
 233 static int mlx4_UNMAP_ICM(struct mlx4_dev *dev, u64 virt, u32 page_count)
 234 {
 235         return mlx4_cmd(dev, virt, page_count, 0, MLX4_CMD_UNMAP_ICM,
 236                         MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
 237 }
 238
 239 int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm)
 240 {
 241         return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM_AUX, icm, -1);
 242 }
 243
 244 int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev)
 245 {
 246         return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_UNMAP_ICM_AUX,
 247                         MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
 248 }
 249
 250 int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj,
 251                    gfp_t gfp)
 252 {
 253         u32 i = (obj & (table->num_obj - 1)) /
 254                         (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
 255         int ret = 0;
 256
 257         mutex_lock(&table->mutex);
 258
 259         if (table->icm[i]) {
 260                 ++table->icm[i]->refcount;
 261                 goto out;
 262         }
 263
 264         table->icm[i] = mlx4_alloc_icm(dev, MLX4_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
 265                                        (table->lowmem ? gfp : GFP_HIGHUSER) |
 266                                        __GFP_NOWARN, table->coherent);
 267         if (!table->icm[i]) {
 268                 ret = -ENOMEM;
 269                 goto out;
 270         }
 271
 272         if (mlx4_MAP_ICM(dev, table->icm[i], table->virt +
 273                          (u64) i * MLX4_TABLE_CHUNK_SIZE)) {
 274                 mlx4_free_icm(dev, table->icm[i], table->coherent);
 275                 table->icm[i] = NULL;
 276                 ret = -ENOMEM;
 277                 goto out;
 278         }
 279
 280         ++table->icm[i]->refcount;
 281
 282 out:
 283         mutex_unlock(&table->mutex);
 284         return ret;
 285 }
 286
 287 void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj)
 288 {
 289         u32 i;
 290         u64 offset;
 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                 offset = (u64) i * MLX4_TABLE_CHUNK_SIZE;
 298                 mlx4_UNMAP_ICM(dev, table->virt + offset,
 299                                MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 300                 mlx4_free_icm(dev, table->icm[i], table->coherent);
 301                 table->icm[i] = NULL;
 302         }
 303
 304         mutex_unlock(&table->mutex);
 305 }
 306
 307 void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj,
 308                         dma_addr_t *dma_handle)
 309 {
 310         int offset, dma_offset, i;
 311         u64 idx;
 312         struct mlx4_icm_chunk *chunk;
 313         struct mlx4_icm *icm;
 314         struct page *page = NULL;
 315
 316         if (!table->lowmem)
 317                 return NULL;
 318
 319         mutex_lock(&table->mutex);
 320
 321         idx = (u64) (obj & (table->num_obj - 1)) * table->obj_size;
 322         icm = table->icm[idx / MLX4_TABLE_CHUNK_SIZE];
 323         dma_offset = offset = idx % MLX4_TABLE_CHUNK_SIZE;
 324
 325         if (!icm)
 326                 goto out;
 327
 328         list_for_each_entry(chunk, &icm->chunk_list, list) {
 329                 for (i = 0; i < chunk->npages; ++i) {
 330                         if (dma_handle && dma_offset >= 0) {
 331                                 if (sg_dma_len(&chunk->mem[i]) > dma_offset)
 332                                         *dma_handle = sg_dma_address(&chunk->mem[i]) +
 333                                                 dma_offset;
 334                                 dma_offset -= sg_dma_len(&chunk->mem[i]);
 335                         }
 336                         /*
 337                          * DMA mapping can merge pages but not split them,
 338                          * so if we found the page, dma_handle has already
 339                          * been assigned to.
 340                          */
 341                         if (chunk->mem[i].length > offset) {
 342                                 page = sg_page(&chunk->mem[i]);
 343                                 goto out;
 344                         }
 345                         offset -= chunk->mem[i].length;
 346                 }
 347         }
 348
 349 out:
 350         mutex_unlock(&table->mutex);
 351         return page ? lowmem_page_address(page) + offset : NULL;
 352 }
 353
 354 int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 355                          u32 start, u32 end)
 356 {
 357         int inc = MLX4_TABLE_CHUNK_SIZE / table->obj_size;
 358         int err;
 359         u32 i;
 360
 361         for (i = start; i <= end; i += inc) {
 362                 err = mlx4_table_get(dev, table, i, GFP_KERNEL);
 363                 if (err)
 364                         goto fail;
 365         }
 366
 367         return 0;
 368
 369 fail:
 370         while (i > start) {
 371                 i -= inc;
 372                 mlx4_table_put(dev, table, i);
 373         }
 374
 375         return err;
 376 }
 377
 378 void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 379                           u32 start, u32 end)
 380 {
 381         u32 i;
 382
 383         for (i = start; i <= end; i += MLX4_TABLE_CHUNK_SIZE / table->obj_size)
 384                 mlx4_table_put(dev, table, i);
 385 }
 386
 387 int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 388                         u64 virt, int obj_size, u32 nobj, int reserved,
 389                         int use_lowmem, int use_coherent)
 390 {
 391         int obj_per_chunk;
 392         int num_icm;
 393         unsigned chunk_size;
 394         int i;
 395         u64 size;
 396
 397         obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size;
 398         num_icm = (nobj + obj_per_chunk - 1) / obj_per_chunk;
 399
 400         table->icm      = kcalloc(num_icm, sizeof *table->icm, GFP_KERNEL);
 401         if (!table->icm)
 402                 return -ENOMEM;
 403         table->virt     = virt;
 404         table->num_icm  = num_icm;
 405         table->num_obj  = nobj;
 406         table->obj_size = obj_size;
 407         table->lowmem   = use_lowmem;
 408         table->coherent = use_coherent;
 409         mutex_init(&table->mutex);
 410
 411         size = (u64) nobj * obj_size;
 412         for (i = 0; i * MLX4_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
 413                 chunk_size = MLX4_TABLE_CHUNK_SIZE;
 414                 if ((u64) (i + 1) * MLX4_TABLE_CHUNK_SIZE > size)
 415                         chunk_size = PAGE_ALIGN(size -
 416                                         i * MLX4_TABLE_CHUNK_SIZE);
 417
 418                 table->icm[i] = mlx4_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
 419                                                (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
 420                                                __GFP_NOWARN, use_coherent);
 421                 if (!table->icm[i])
 422                         goto err;
 423                 if (mlx4_MAP_ICM(dev, table->icm[i], virt + i * MLX4_TABLE_CHUNK_SIZE)) {
 424                         mlx4_free_icm(dev, table->icm[i], use_coherent);
 425                         table->icm[i] = NULL;
 426                         goto err;
 427                 }
 428
 429                 /*
 430                  * Add a reference to this ICM chunk so that it never
 431                  * gets freed (since it contains reserved firmware objects).
 432                  */
 433                 ++table->icm[i]->refcount;
 434         }
 435
 436         return 0;
 437
 438 err:
 439         for (i = 0; i < num_icm; ++i)
 440                 if (table->icm[i]) {
 441                         mlx4_UNMAP_ICM(dev, virt + i * MLX4_TABLE_CHUNK_SIZE,
 442                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 443                         mlx4_free_icm(dev, table->icm[i], use_coherent);
 444                 }
 445
 446         kfree(table->icm);
 447
 448         return -ENOMEM;
 449 }
 450
 451 void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table)
 452 {
 453         int i;
 454
 455         for (i = 0; i < table->num_icm; ++i)
 456                 if (table->icm[i]) {
 457                         mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
 458                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 459                         mlx4_free_icm(dev, table->icm[i], table->coherent);
 460                 }
 461
 462         kfree(table->icm);
 463 }