drivers/infiniband/hw/mthca/mthca_memfree.c

   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  * $Id$
  33  */
  34
  35 #include <linux/mm.h>
  36
  37 #include "mthca_memfree.h"
  38 #include "mthca_dev.h"
  39 #include "mthca_cmd.h"
  40
  41 /*
  42  * We allocate in as big chunks as we can, up to a maximum of 256 KB
  43  * per chunk.
  44  */
  45 enum {
  46         MTHCA_ICM_ALLOC_SIZE   = 1 << 18,
  47         MTHCA_TABLE_CHUNK_SIZE = 1 << 18
  48 };
  49
  50 void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm)
  51 {
  52         struct mthca_icm_chunk *chunk, *tmp;
  53         int i;
  54
  55         if (!icm)
  56                 return;
  57
  58         list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
  59                 if (chunk->nsg > 0)
  60                         pci_unmap_sg(dev->pdev, chunk->mem, chunk->npages,
  61                                      PCI_DMA_BIDIRECTIONAL);
  62
  63                 for (i = 0; i < chunk->npages; ++i)
  64                         __free_pages(chunk->mem[i].page,
  65                                      get_order(chunk->mem[i].length));
  66
  67                 kfree(chunk);
  68         }
  69
  70         kfree(icm);
  71 }
  72
  73 struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
  74                                   unsigned int gfp_mask)
  75 {
  76         struct mthca_icm *icm;
  77         struct mthca_icm_chunk *chunk = NULL;
  78         int cur_order;
  79
  80         icm = kmalloc(sizeof *icm, gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
  81         if (!icm)
  82                 return icm;
  83
  84         icm->refcount = 0;
  85         INIT_LIST_HEAD(&icm->chunk_list);
  86
  87         cur_order = get_order(MTHCA_ICM_ALLOC_SIZE);
  88
  89         while (npages > 0) {
  90                 if (!chunk) {
  91                         chunk = kmalloc(sizeof *chunk,
  92                                         gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
  93                         if (!chunk)
  94                                 goto fail;
  95
  96                         chunk->npages = 0;
  97                         chunk->nsg    = 0;
  98                         list_add_tail(&chunk->list, &icm->chunk_list);
  99                 }
 100
 101                 while (1 << cur_order > npages)
 102                         --cur_order;
 103
 104                 chunk->mem[chunk->npages].page = alloc_pages(gfp_mask, cur_order);
 105                 if (chunk->mem[chunk->npages].page) {
 106                         chunk->mem[chunk->npages].length = PAGE_SIZE << cur_order;
 107                         chunk->mem[chunk->npages].offset = 0;
 108
 109                         if (++chunk->npages == MTHCA_ICM_CHUNK_LEN) {
 110                                 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
 111                                                         chunk->npages,
 112                                                         PCI_DMA_BIDIRECTIONAL);
 113
 114                                 if (chunk->nsg <= 0)
 115                                         goto fail;
 116
 117                                 chunk = NULL;
 118                         }
 119
 120                         npages -= 1 << cur_order;
 121                 } else {
 122                         --cur_order;
 123                         if (cur_order < 0)
 124                                 goto fail;
 125                 }
 126         }
 127
 128         if (chunk) {
 129                 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
 130                                         chunk->npages,
 131                                         PCI_DMA_BIDIRECTIONAL);
 132
 133                 if (chunk->nsg <= 0)
 134                         goto fail;
 135         }
 136
 137         return icm;
 138
 139 fail:
 140         mthca_free_icm(dev, icm);
 141         return NULL;
 142 }
 143
 144 int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj)
 145 {
 146         int i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE;
 147         int ret = 0;
 148         u8 status;
 149
 150         down(&table->mutex);
 151
 152         if (table->icm[i]) {
 153                 ++table->icm[i]->refcount;
 154                 goto out;
 155         }
 156
 157         table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
 158                                         (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
 159                                         __GFP_NOWARN);
 160         if (!table->icm[i]) {
 161                 ret = -ENOMEM;
 162                 goto out;
 163         }
 164
 165         if (mthca_MAP_ICM(dev, table->icm[i], table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
 166                           &status) || status) {
 167                 mthca_free_icm(dev, table->icm[i]);
 168                 table->icm[i] = NULL;
 169                 ret = -ENOMEM;
 170                 goto out;
 171         }
 172
 173         ++table->icm[i]->refcount;
 174
 175 out:
 176         up(&table->mutex);
 177         return ret;
 178 }
 179
 180 void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj)
 181 {
 182         int i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE;
 183         u8 status;
 184
 185         down(&table->mutex);
 186
 187         if (--table->icm[i]->refcount == 0) {
 188                 mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
 189                                 MTHCA_TABLE_CHUNK_SIZE >> 12, &status);
 190                 mthca_free_icm(dev, table->icm[i]);
 191                 table->icm[i] = NULL;
 192         }
 193
 194         up(&table->mutex);
 195 }
 196
 197 void *mthca_table_find(struct mthca_icm_table *table, int obj)
 198 {
 199         int idx, offset, i;
 200         struct mthca_icm_chunk *chunk;
 201         struct mthca_icm *icm;
 202         struct page *page = NULL;
 203
 204         if (!table->lowmem)
 205                 return NULL;
 206
 207         down(&table->mutex);
 208
 209         idx = (obj & (table->num_obj - 1)) * table->obj_size;
 210         icm = table->icm[idx / MTHCA_TABLE_CHUNK_SIZE];
 211         offset = idx % MTHCA_TABLE_CHUNK_SIZE;
 212
 213         if (!icm)
 214                 goto out;
 215
 216         list_for_each_entry(chunk, &icm->chunk_list, list) {
 217                 for (i = 0; i < chunk->npages; ++i) {
 218                         if (chunk->mem[i].length >= offset) {
 219                                 page = chunk->mem[i].page;
 220                                 break;
 221                         }
 222                         offset -= chunk->mem[i].length;
 223                 }
 224         }
 225
 226 out:
 227         up(&table->mutex);
 228         return page ? lowmem_page_address(page) + offset : NULL;
 229 }
 230
 231 int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
 232                           int start, int end)
 233 {
 234         int inc = MTHCA_TABLE_CHUNK_SIZE / table->obj_size;
 235         int i, err;
 236
 237         for (i = start; i <= end; i += inc) {
 238                 err = mthca_table_get(dev, table, i);
 239                 if (err)
 240                         goto fail;
 241         }
 242
 243         return 0;
 244
 245 fail:
 246         while (i > start) {
 247                 i -= inc;
 248                 mthca_table_put(dev, table, i);
 249         }
 250
 251         return err;
 252 }
 253
 254 void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table,
 255                            int start, int end)
 256 {
 257         int i;
 258
 259         for (i = start; i <= end; i += MTHCA_TABLE_CHUNK_SIZE / table->obj_size)
 260                 mthca_table_put(dev, table, i);
 261 }
 262
 263 struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
 264                                               u64 virt, int obj_size,
 265                                               int nobj, int reserved,
 266                                               int use_lowmem)
 267 {
 268         struct mthca_icm_table *table;
 269         int num_icm;
 270         int i;
 271         u8 status;
 272
 273         num_icm = obj_size * nobj / MTHCA_TABLE_CHUNK_SIZE;
 274
 275         table = kmalloc(sizeof *table + num_icm * sizeof *table->icm, GFP_KERNEL);
 276         if (!table)
 277                 return NULL;
 278
 279         table->virt     = virt;
 280         table->num_icm  = num_icm;
 281         table->num_obj  = nobj;
 282         table->obj_size = obj_size;
 283         table->lowmem   = use_lowmem;
 284         init_MUTEX(&table->mutex);
 285
 286         for (i = 0; i < num_icm; ++i)
 287                 table->icm[i] = NULL;
 288
 289         for (i = 0; i * MTHCA_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
 290                 table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
 291                                                 (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
 292                                                 __GFP_NOWARN);
 293                 if (!table->icm[i])
 294                         goto err;
 295                 if (mthca_MAP_ICM(dev, table->icm[i], virt + i * MTHCA_TABLE_CHUNK_SIZE,
 296                                   &status) || status) {
 297                         mthca_free_icm(dev, table->icm[i]);
 298                         table->icm[i] = NULL;
 299                         goto err;
 300                 }
 301
 302                 /*
 303                  * Add a reference to this ICM chunk so that it never
 304                  * gets freed (since it contains reserved firmware objects).
 305                  */
 306                 ++table->icm[i]->refcount;
 307         }
 308
 309         return table;
 310
 311 err:
 312         for (i = 0; i < num_icm; ++i)
 313                 if (table->icm[i]) {
 314                         mthca_UNMAP_ICM(dev, virt + i * MTHCA_TABLE_CHUNK_SIZE,
 315                                         MTHCA_TABLE_CHUNK_SIZE >> 12, &status);
 316                         mthca_free_icm(dev, table->icm[i]);
 317                 }
 318
 319         kfree(table);
 320
 321         return NULL;
 322 }
 323
 324 void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table)
 325 {
 326         int i;
 327         u8 status;
 328
 329         for (i = 0; i < table->num_icm; ++i)
 330                 if (table->icm[i]) {
 331                         mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
 332                                         MTHCA_TABLE_CHUNK_SIZE >> 12, &status);
 333                         mthca_free_icm(dev, table->icm[i]);
 334                 }
 335
 336         kfree(table);
 337 }
 338
 339 static u64 mthca_uarc_virt(struct mthca_dev *dev, int page)
 340 {
 341         return dev->uar_table.uarc_base +
 342                 dev->driver_uar.index * dev->uar_table.uarc_size +
 343                 page * 4096;
 344 }
 345
 346 int mthca_alloc_db(struct mthca_dev *dev, int type, u32 qn, u32 **db)
 347 {
 348         int group;
 349         int start, end, dir;
 350         int i, j;
 351         struct mthca_db_page *page;
 352         int ret = 0;
 353         u8 status;
 354
 355         down(&dev->db_tab->mutex);
 356
 357         switch (type) {
 358         case MTHCA_DB_TYPE_CQ_ARM:
 359         case MTHCA_DB_TYPE_SQ:
 360                 group = 0;
 361                 start = 0;
 362                 end   = dev->db_tab->max_group1;
 363                 dir   = 1;
 364                 break;
 365
 366         case MTHCA_DB_TYPE_CQ_SET_CI:
 367         case MTHCA_DB_TYPE_RQ:
 368         case MTHCA_DB_TYPE_SRQ:
 369                 group = 1;
 370                 start = dev->db_tab->npages - 1;
 371                 end   = dev->db_tab->min_group2;
 372                 dir   = -1;
 373                 break;
 374
 375         default:
 376                 ret = -EINVAL;
 377                 goto out;
 378         }
 379
 380         for (i = start; i != end; i += dir)
 381                 if (dev->db_tab->page[i].db_rec &&
 382                     !bitmap_full(dev->db_tab->page[i].used,
 383                                  MTHCA_DB_REC_PER_PAGE)) {
 384                         page = dev->db_tab->page + i;
 385                         goto found;
 386                 }
 387
 388         if (dev->db_tab->max_group1 >= dev->db_tab->min_group2 - 1) {
 389                 ret = -ENOMEM;
 390                 goto out;
 391         }
 392
 393         page = dev->db_tab->page + end;
 394         page->db_rec = dma_alloc_coherent(&dev->pdev->dev, 4096,
 395                                           &page->mapping, GFP_KERNEL);
 396         if (!page->db_rec) {
 397                 ret = -ENOMEM;
 398                 goto out;
 399         }
 400         memset(page->db_rec, 0, 4096);
 401
 402         ret = mthca_MAP_ICM_page(dev, page->mapping, mthca_uarc_virt(dev, i), &status);
 403         if (!ret && status)
 404                 ret = -EINVAL;
 405         if (ret) {
 406                 dma_free_coherent(&dev->pdev->dev, 4096,
 407                                   page->db_rec, page->mapping);
 408                 goto out;
 409         }
 410
 411         bitmap_zero(page->used, MTHCA_DB_REC_PER_PAGE);
 412         if (group == 0)
 413                 ++dev->db_tab->max_group1;
 414         else
 415                 --dev->db_tab->min_group2;
 416
 417 found:
 418         j = find_first_zero_bit(page->used, MTHCA_DB_REC_PER_PAGE);
 419         set_bit(j, page->used);
 420
 421         if (group == 1)
 422                 j = MTHCA_DB_REC_PER_PAGE - 1 - j;
 423
 424         ret = i * MTHCA_DB_REC_PER_PAGE + j;
 425
 426         page->db_rec[j] = cpu_to_be64((qn << 8) | (type << 5));
 427
 428         *db = (u32 *) &page->db_rec[j];
 429
 430 out:
 431         up(&dev->db_tab->mutex);
 432
 433         return ret;
 434 }
 435
 436 void mthca_free_db(struct mthca_dev *dev, int type, int db_index)
 437 {
 438         int i, j;
 439         struct mthca_db_page *page;
 440         u8 status;
 441
 442         i = db_index / MTHCA_DB_REC_PER_PAGE;
 443         j = db_index % MTHCA_DB_REC_PER_PAGE;
 444
 445         page = dev->db_tab->page + i;
 446
 447         down(&dev->db_tab->mutex);
 448
 449         page->db_rec[j] = 0;
 450         if (i >= dev->db_tab->min_group2)
 451                 j = MTHCA_DB_REC_PER_PAGE - 1 - j;
 452         clear_bit(j, page->used);
 453
 454         if (bitmap_empty(page->used, MTHCA_DB_REC_PER_PAGE) &&
 455             i >= dev->db_tab->max_group1 - 1) {
 456                 mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, i), 1, &status);
 457
 458                 dma_free_coherent(&dev->pdev->dev, 4096,
 459                                   page->db_rec, page->mapping);
 460                 page->db_rec = NULL;
 461
 462                 if (i == dev->db_tab->max_group1) {
 463                         --dev->db_tab->max_group1;
 464                         /* XXX may be able to unmap more pages now */
 465                 }
 466                 if (i == dev->db_tab->min_group2)
 467                         ++dev->db_tab->min_group2;
 468         }
 469
 470         up(&dev->db_tab->mutex);
 471 }
 472
 473 int mthca_init_db_tab(struct mthca_dev *dev)
 474 {
 475         int i;
 476
 477         if (!mthca_is_memfree(dev))
 478                 return 0;
 479
 480         dev->db_tab = kmalloc(sizeof *dev->db_tab, GFP_KERNEL);
 481         if (!dev->db_tab)
 482                 return -ENOMEM;
 483
 484         init_MUTEX(&dev->db_tab->mutex);
 485
 486         dev->db_tab->npages     = dev->uar_table.uarc_size / 4096;
 487         dev->db_tab->max_group1 = 0;
 488         dev->db_tab->min_group2 = dev->db_tab->npages - 1;
 489
 490         dev->db_tab->page = kmalloc(dev->db_tab->npages *
 491                                     sizeof *dev->db_tab->page,
 492                                     GFP_KERNEL);
 493         if (!dev->db_tab->page) {
 494                 kfree(dev->db_tab);
 495                 return -ENOMEM;
 496         }
 497
 498         for (i = 0; i < dev->db_tab->npages; ++i)
 499                 dev->db_tab->page[i].db_rec = NULL;
 500
 501         return 0;
 502 }
 503
 504 void mthca_cleanup_db_tab(struct mthca_dev *dev)
 505 {
 506         int i;
 507         u8 status;
 508
 509         if (!mthca_is_memfree(dev))
 510                 return;
 511
 512         /*
 513          * Because we don't always free our UARC pages when they
 514          * become empty to make mthca_free_db() simpler we need to
 515          * make a sweep through the doorbell pages and free any
 516          * leftover pages now.
 517          */
 518         for (i = 0; i < dev->db_tab->npages; ++i) {
 519                 if (!dev->db_tab->page[i].db_rec)
 520                         continue;
 521
 522                 if (!bitmap_empty(dev->db_tab->page[i].used, MTHCA_DB_REC_PER_PAGE))
 523                         mthca_warn(dev, "Kernel UARC page %d not empty\n", i);
 524
 525                 mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, i), 1, &status);
 526
 527                 dma_free_coherent(&dev->pdev->dev, 4096,
 528                                   dev->db_tab->page[i].db_rec,
 529                                   dev->db_tab->page[i].mapping);
 530         }
 531
 532         kfree(dev->db_tab->page);
 533         kfree(dev->db_tab);
 534 }