drivers/net/mlx4/icm.c

   1 /*
   2  * Copyright (c) 2005 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/init.h>
  35 #include <linux/errno.h>
  36
  37 #include <linux/mlx4/cmd.h>
  38
  39 #include "mlx4.h"
  40 #include "icm.h"
  41 #include "fw.h"
  42
  43 /*
  44  * We allocate in as big chunks as we can, up to a maximum of 256 KB
  45  * per chunk.
  46  */
  47 enum {
  48         MLX4_ICM_ALLOC_SIZE     = 1 << 18,
  49         MLX4_TABLE_CHUNK_SIZE   = 1 << 18
  50 };
  51
  52 void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm)
  53 {
  54         struct mlx4_icm_chunk *chunk, *tmp;
  55         int i;
  56
  57         list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
  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(chunk->mem[i].page,
  64                                      get_order(chunk->mem[i].length));
  65
  66                 kfree(chunk);
  67         }
  68
  69         kfree(icm);
  70 }
  71
  72 struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
  73                                 gfp_t gfp_mask)
  74 {
  75         struct mlx4_icm *icm;
  76         struct mlx4_icm_chunk *chunk = NULL;
  77         int cur_order;
  78
  79         icm = kmalloc(sizeof *icm, gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
  80         if (!icm)
  81                 return icm;
  82
  83         icm->refcount = 0;
  84         INIT_LIST_HEAD(&icm->chunk_list);
  85
  86         cur_order = get_order(MLX4_ICM_ALLOC_SIZE);
  87
  88         while (npages > 0) {
  89                 if (!chunk) {
  90                         chunk = kmalloc(sizeof *chunk,
  91                                         gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
  92                         if (!chunk)
  93                                 goto fail;
  94
  95                         chunk->npages = 0;
  96                         chunk->nsg    = 0;
  97                         list_add_tail(&chunk->list, &icm->chunk_list);
  98                 }
  99
 100                 while (1 << cur_order > npages)
 101                         --cur_order;
 102
 103                 chunk->mem[chunk->npages].page = alloc_pages(gfp_mask, cur_order);
 104                 if (chunk->mem[chunk->npages].page) {
 105                         chunk->mem[chunk->npages].length = PAGE_SIZE << cur_order;
 106                         chunk->mem[chunk->npages].offset = 0;
 107
 108                         if (++chunk->npages == MLX4_ICM_CHUNK_LEN) {
 109                                 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
 110                                                         chunk->npages,
 111                                                         PCI_DMA_BIDIRECTIONAL);
 112
 113                                 if (chunk->nsg <= 0)
 114                                         goto fail;
 115
 116                                 chunk = NULL;
 117                         }
 118
 119                         npages -= 1 << cur_order;
 120                 } else {
 121                         --cur_order;
 122                         if (cur_order < 0)
 123                                 goto fail;
 124                 }
 125         }
 126
 127         if (chunk) {
 128                 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
 129                                         chunk->npages,
 130                                         PCI_DMA_BIDIRECTIONAL);
 131
 132                 if (chunk->nsg <= 0)
 133                         goto fail;
 134         }
 135
 136         return icm;
 137
 138 fail:
 139         mlx4_free_icm(dev, icm);
 140         return NULL;
 141 }
 142
 143 static int mlx4_MAP_ICM(struct mlx4_dev *dev, struct mlx4_icm *icm, u64 virt)
 144 {
 145         return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM, icm, virt);
 146 }
 147
 148 int mlx4_UNMAP_ICM(struct mlx4_dev *dev, u64 virt, u32 page_count)
 149 {
 150         return mlx4_cmd(dev, virt, page_count, 0, MLX4_CMD_UNMAP_ICM,
 151                         MLX4_CMD_TIME_CLASS_B);
 152 }
 153
 154 int mlx4_MAP_ICM_page(struct mlx4_dev *dev, u64 dma_addr, u64 virt)
 155 {
 156         struct mlx4_cmd_mailbox *mailbox;
 157         __be64 *inbox;
 158         int err;
 159
 160         mailbox = mlx4_alloc_cmd_mailbox(dev);
 161         if (IS_ERR(mailbox))
 162                 return PTR_ERR(mailbox);
 163         inbox = mailbox->buf;
 164
 165         inbox[0] = cpu_to_be64(virt);
 166         inbox[1] = cpu_to_be64(dma_addr);
 167
 168         err = mlx4_cmd(dev, mailbox->dma, 1, 0, MLX4_CMD_MAP_ICM,
 169                        MLX4_CMD_TIME_CLASS_B);
 170
 171         mlx4_free_cmd_mailbox(dev, mailbox);
 172
 173         if (!err)
 174                 mlx4_dbg(dev, "Mapped page at %llx to %llx for ICM.\n",
 175                           (unsigned long long) dma_addr, (unsigned long long) virt);
 176
 177         return err;
 178 }
 179
 180 int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm)
 181 {
 182         return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM_AUX, icm, -1);
 183 }
 184
 185 int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev)
 186 {
 187         return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_UNMAP_ICM_AUX, MLX4_CMD_TIME_CLASS_B);
 188 }
 189
 190 int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj)
 191 {
 192         int i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
 193         int ret = 0;
 194
 195         mutex_lock(&table->mutex);
 196
 197         if (table->icm[i]) {
 198                 ++table->icm[i]->refcount;
 199                 goto out;
 200         }
 201
 202         table->icm[i] = mlx4_alloc_icm(dev, MLX4_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
 203                                        (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
 204                                        __GFP_NOWARN);
 205         if (!table->icm[i]) {
 206                 ret = -ENOMEM;
 207                 goto out;
 208         }
 209
 210         if (mlx4_MAP_ICM(dev, table->icm[i], table->virt +
 211                          (u64) i * MLX4_TABLE_CHUNK_SIZE)) {
 212                 mlx4_free_icm(dev, table->icm[i]);
 213                 table->icm[i] = NULL;
 214                 ret = -ENOMEM;
 215                 goto out;
 216         }
 217
 218         ++table->icm[i]->refcount;
 219
 220 out:
 221         mutex_unlock(&table->mutex);
 222         return ret;
 223 }
 224
 225 void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj)
 226 {
 227         int i;
 228
 229         i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
 230
 231         mutex_lock(&table->mutex);
 232
 233         if (--table->icm[i]->refcount == 0) {
 234                 mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
 235                                MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 236                 mlx4_free_icm(dev, table->icm[i]);
 237                 table->icm[i] = NULL;
 238         }
 239
 240         mutex_unlock(&table->mutex);
 241 }
 242
 243 void *mlx4_table_find(struct mlx4_icm_table *table, int obj)
 244 {
 245         int idx, offset, i;
 246         struct mlx4_icm_chunk *chunk;
 247         struct mlx4_icm *icm;
 248         struct page *page = NULL;
 249
 250         if (!table->lowmem)
 251                 return NULL;
 252
 253         mutex_lock(&table->mutex);
 254
 255         idx = obj & (table->num_obj - 1);
 256         icm = table->icm[idx / (MLX4_TABLE_CHUNK_SIZE / table->obj_size)];
 257         offset = idx % (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
 258
 259         if (!icm)
 260                 goto out;
 261
 262         list_for_each_entry(chunk, &icm->chunk_list, list) {
 263                 for (i = 0; i < chunk->npages; ++i) {
 264                         if (chunk->mem[i].length > offset) {
 265                                 page = chunk->mem[i].page;
 266                                 goto out;
 267                         }
 268                         offset -= chunk->mem[i].length;
 269                 }
 270         }
 271
 272 out:
 273         mutex_unlock(&table->mutex);
 274         return page ? lowmem_page_address(page) + offset : NULL;
 275 }
 276
 277 int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 278                          int start, int end)
 279 {
 280         int inc = MLX4_TABLE_CHUNK_SIZE / table->obj_size;
 281         int i, err;
 282
 283         for (i = start; i <= end; i += inc) {
 284                 err = mlx4_table_get(dev, table, i);
 285                 if (err)
 286                         goto fail;
 287         }
 288
 289         return 0;
 290
 291 fail:
 292         while (i > start) {
 293                 i -= inc;
 294                 mlx4_table_put(dev, table, i);
 295         }
 296
 297         return err;
 298 }
 299
 300 void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 301                           int start, int end)
 302 {
 303         int i;
 304
 305         for (i = start; i <= end; i += MLX4_TABLE_CHUNK_SIZE / table->obj_size)
 306                 mlx4_table_put(dev, table, i);
 307 }
 308
 309 int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
 310                         u64 virt, int obj_size, int nobj, int reserved,
 311                         int use_lowmem)
 312 {
 313         int obj_per_chunk;
 314         int num_icm;
 315         unsigned chunk_size;
 316         int i;
 317
 318         obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size;
 319         num_icm = (nobj + obj_per_chunk - 1) / obj_per_chunk;
 320
 321         table->icm      = kcalloc(num_icm, sizeof *table->icm, GFP_KERNEL);
 322         if (!table->icm)
 323                 return -ENOMEM;
 324         table->virt     = virt;
 325         table->num_icm  = num_icm;
 326         table->num_obj  = nobj;
 327         table->obj_size = obj_size;
 328         table->lowmem   = use_lowmem;
 329         mutex_init(&table->mutex);
 330
 331         for (i = 0; i * MLX4_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
 332                 chunk_size = MLX4_TABLE_CHUNK_SIZE;
 333                 if ((i + 1) * MLX4_TABLE_CHUNK_SIZE > nobj * obj_size)
 334                         chunk_size = PAGE_ALIGN(nobj * obj_size - i * MLX4_TABLE_CHUNK_SIZE);
 335
 336                 table->icm[i] = mlx4_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
 337                                                (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
 338                                                __GFP_NOWARN);
 339                 if (!table->icm[i])
 340                         goto err;
 341                 if (mlx4_MAP_ICM(dev, table->icm[i], virt + i * MLX4_TABLE_CHUNK_SIZE)) {
 342                         mlx4_free_icm(dev, table->icm[i]);
 343                         table->icm[i] = NULL;
 344                         goto err;
 345                 }
 346
 347                 /*
 348                  * Add a reference to this ICM chunk so that it never
 349                  * gets freed (since it contains reserved firmware objects).
 350                  */
 351                 ++table->icm[i]->refcount;
 352         }
 353
 354         return 0;
 355
 356 err:
 357         for (i = 0; i < num_icm; ++i)
 358                 if (table->icm[i]) {
 359                         mlx4_UNMAP_ICM(dev, virt + i * MLX4_TABLE_CHUNK_SIZE,
 360                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 361                         mlx4_free_icm(dev, table->icm[i]);
 362                 }
 363
 364         return -ENOMEM;
 365 }
 366
 367 void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table)
 368 {
 369         int i;
 370
 371         for (i = 0; i < table->num_icm; ++i)
 372                 if (table->icm[i]) {
 373                         mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
 374                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
 375                         mlx4_free_icm(dev, table->icm[i]);
 376                 }
 377
 378         kfree(table->icm);
 379 }