drivers/infiniband/hw/mthca/mthca_mr.c

   1 /*
   2  * Copyright (c) 2004 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: mthca_mr.c 1349 2004-12-16 21:09:43Z roland $
  33  */
  34
  35 #include <linux/slab.h>
  36 #include <linux/init.h>
  37 #include <linux/errno.h>
  38
  39 #include "mthca_dev.h"
  40 #include "mthca_cmd.h"
  41 #include "mthca_memfree.h"
  42
  43 /*
  44  * Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
  45  */
  46 struct mthca_mpt_entry {
  47         u32 flags;
  48         u32 page_size;
  49         u32 key;
  50         u32 pd;
  51         u64 start;
  52         u64 length;
  53         u32 lkey;
  54         u32 window_count;
  55         u32 window_count_limit;
  56         u64 mtt_seg;
  57         u32 mtt_sz;             /* Arbel only */
  58         u32 reserved[2];
  59 } __attribute__((packed));
  60
  61 #define MTHCA_MPT_FLAG_SW_OWNS       (0xfUL << 28)
  62 #define MTHCA_MPT_FLAG_MIO           (1 << 17)
  63 #define MTHCA_MPT_FLAG_BIND_ENABLE   (1 << 15)
  64 #define MTHCA_MPT_FLAG_PHYSICAL      (1 <<  9)
  65 #define MTHCA_MPT_FLAG_REGION        (1 <<  8)
  66
  67 #define MTHCA_MTT_FLAG_PRESENT       1
  68
  69 /*
  70  * Buddy allocator for MTT segments (currently not very efficient
  71  * since it doesn't keep a free list and just searches linearly
  72  * through the bitmaps)
  73  */
  74
  75 static u32 __mthca_alloc_mtt(struct mthca_dev *dev, int order)
  76 {
  77         int o;
  78         int m;
  79         u32 seg;
  80
  81         spin_lock(&dev->mr_table.mpt_alloc.lock);
  82
  83         for (o = order; o <= dev->mr_table.max_mtt_order; ++o) {
  84                 m = 1 << (dev->mr_table.max_mtt_order - o);
  85                 seg = find_first_bit(dev->mr_table.mtt_buddy[o], m);
  86                 if (seg < m)
  87                         goto found;
  88         }
  89
  90         spin_unlock(&dev->mr_table.mpt_alloc.lock);
  91         return -1;
  92
  93  found:
  94         clear_bit(seg, dev->mr_table.mtt_buddy[o]);
  95
  96         while (o > order) {
  97                 --o;
  98                 seg <<= 1;
  99                 set_bit(seg ^ 1, dev->mr_table.mtt_buddy[o]);
 100         }
 101
 102         spin_unlock(&dev->mr_table.mpt_alloc.lock);
 103
 104         seg <<= order;
 105
 106         return seg;
 107 }
 108
 109 static void __mthca_free_mtt(struct mthca_dev *dev, u32 seg, int order)
 110 {
 111         seg >>= order;
 112
 113         spin_lock(&dev->mr_table.mpt_alloc.lock);
 114
 115         while (test_bit(seg ^ 1, dev->mr_table.mtt_buddy[order])) {
 116                 clear_bit(seg ^ 1, dev->mr_table.mtt_buddy[order]);
 117                 seg >>= 1;
 118                 ++order;
 119         }
 120
 121         set_bit(seg, dev->mr_table.mtt_buddy[order]);
 122
 123         spin_unlock(&dev->mr_table.mpt_alloc.lock);
 124 }
 125
 126 static u32 mthca_alloc_mtt(struct mthca_dev *dev, int order)
 127 {
 128         u32 seg = __mthca_alloc_mtt(dev, order);
 129
 130         if (seg == -1)
 131                 return -1;
 132
 133         if (dev->hca_type == ARBEL_NATIVE)
 134                 if (mthca_table_get_range(dev, dev->mr_table.mtt_table, seg,
 135                                           seg + (1 << order) - 1)) {
 136                         __mthca_free_mtt(dev, seg, order);
 137                         seg = -1;
 138                 }
 139
 140         return seg;
 141 }
 142
 143 static void mthca_free_mtt(struct mthca_dev *dev, u32 seg, int order)
 144 {
 145         __mthca_free_mtt(dev, seg, order);
 146
 147         if (dev->hca_type == ARBEL_NATIVE)
 148                 mthca_table_put_range(dev, dev->mr_table.mtt_table, seg,
 149                                       seg + (1 << order) - 1);
 150 }
 151
 152 static inline u32 hw_index_to_key(struct mthca_dev *dev, u32 ind)
 153 {
 154         if (dev->hca_type == ARBEL_NATIVE)
 155                 return (ind >> 24) | (ind << 8);
 156         else
 157                 return ind;
 158 }
 159
 160 static inline u32 key_to_hw_index(struct mthca_dev *dev, u32 key)
 161 {
 162         if (dev->hca_type == ARBEL_NATIVE)
 163                 return (key << 24) | (key >> 8);
 164         else
 165                 return key;
 166 }
 167
 168 int mthca_mr_alloc_notrans(struct mthca_dev *dev, u32 pd,
 169                            u32 access, struct mthca_mr *mr)
 170 {
 171         void *mailbox = NULL;
 172         struct mthca_mpt_entry *mpt_entry;
 173         u32 key;
 174         int err;
 175         u8 status;
 176
 177         might_sleep();
 178
 179         mr->order = -1;
 180         key = mthca_alloc(&dev->mr_table.mpt_alloc);
 181         if (key == -1)
 182                 return -ENOMEM;
 183         mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);
 184
 185         if (dev->hca_type == ARBEL_NATIVE) {
 186                 err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
 187                 if (err)
 188                         goto err_out_mpt_free;
 189         }
 190
 191         mailbox = kmalloc(sizeof *mpt_entry + MTHCA_CMD_MAILBOX_EXTRA,
 192                           GFP_KERNEL);
 193         if (!mailbox) {
 194                 err = -ENOMEM;
 195                 goto err_out_table;
 196         }
 197         mpt_entry = MAILBOX_ALIGN(mailbox);
 198
 199         mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS     |
 200                                        MTHCA_MPT_FLAG_MIO         |
 201                                        MTHCA_MPT_FLAG_PHYSICAL    |
 202                                        MTHCA_MPT_FLAG_REGION      |
 203                                        access);
 204         mpt_entry->page_size = 0;
 205         mpt_entry->key       = cpu_to_be32(key);
 206         mpt_entry->pd        = cpu_to_be32(pd);
 207         mpt_entry->start     = 0;
 208         mpt_entry->length    = ~0ULL;
 209
 210         memset(&mpt_entry->lkey, 0,
 211                sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, lkey));
 212
 213         err = mthca_SW2HW_MPT(dev, mpt_entry,
 214                               key & (dev->limits.num_mpts - 1),
 215                               &status);
 216         if (err) {
 217                 mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
 218                 goto err_out_table;
 219         } else if (status) {
 220                 mthca_warn(dev, "SW2HW_MPT returned status 0x%02x\n",
 221                            status);
 222                 err = -EINVAL;
 223                 goto err_out_table;
 224         }
 225
 226         kfree(mailbox);
 227         return err;
 228
 229 err_out_table:
 230         if (dev->hca_type == ARBEL_NATIVE)
 231                 mthca_table_put(dev, dev->mr_table.mpt_table, key);
 232
 233 err_out_mpt_free:
 234         mthca_free(&dev->mr_table.mpt_alloc, key);
 235         kfree(mailbox);
 236         return err;
 237 }
 238
 239 int mthca_mr_alloc_phys(struct mthca_dev *dev, u32 pd,
 240                         u64 *buffer_list, int buffer_size_shift,
 241                         int list_len, u64 iova, u64 total_size,
 242                         u32 access, struct mthca_mr *mr)
 243 {
 244         void *mailbox;
 245         u64 *mtt_entry;
 246         struct mthca_mpt_entry *mpt_entry;
 247         u32 key;
 248         int err = -ENOMEM;
 249         u8 status;
 250         int i;
 251
 252         might_sleep();
 253         WARN_ON(buffer_size_shift >= 32);
 254
 255         key = mthca_alloc(&dev->mr_table.mpt_alloc);
 256         if (key == -1)
 257                 return -ENOMEM;
 258         mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);
 259
 260         if (dev->hca_type == ARBEL_NATIVE) {
 261                 err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
 262                 if (err)
 263                         goto err_out_mpt_free;
 264         }
 265
 266         for (i = dev->limits.mtt_seg_size / 8, mr->order = 0;
 267              i < list_len;
 268              i <<= 1, ++mr->order)
 269                 ; /* nothing */
 270
 271         mr->first_seg = mthca_alloc_mtt(dev, mr->order);
 272         if (mr->first_seg == -1)
 273                 goto err_out_table;
 274
 275         /*
 276          * If list_len is odd, we add one more dummy entry for
 277          * firmware efficiency.
 278          */
 279         mailbox = kmalloc(max(sizeof *mpt_entry,
 280                               (size_t) 8 * (list_len + (list_len & 1) + 2)) +
 281                           MTHCA_CMD_MAILBOX_EXTRA,
 282                           GFP_KERNEL);
 283         if (!mailbox)
 284                 goto err_out_free_mtt;
 285
 286         mtt_entry = MAILBOX_ALIGN(mailbox);
 287
 288         mtt_entry[0] = cpu_to_be64(dev->mr_table.mtt_base +
 289                                    mr->first_seg * dev->limits.mtt_seg_size);
 290         mtt_entry[1] = 0;
 291         for (i = 0; i < list_len; ++i)
 292                 mtt_entry[i + 2] = cpu_to_be64(buffer_list[i] |
 293                                                MTHCA_MTT_FLAG_PRESENT);
 294         if (list_len & 1) {
 295                 mtt_entry[i + 2] = 0;
 296                 ++list_len;
 297         }
 298
 299         if (0) {
 300                 mthca_dbg(dev, "Dumping MPT entry\n");
 301                 for (i = 0; i < list_len + 2; ++i)
 302                         printk(KERN_ERR "[%2d] %016llx\n",
 303                                i, (unsigned long long) be64_to_cpu(mtt_entry[i]));
 304         }
 305
 306         err = mthca_WRITE_MTT(dev, mtt_entry, list_len, &status);
 307         if (err) {
 308                 mthca_warn(dev, "WRITE_MTT failed (%d)\n", err);
 309                 goto err_out_mailbox_free;
 310         }
 311         if (status) {
 312                 mthca_warn(dev, "WRITE_MTT returned status 0x%02x\n",
 313                            status);
 314                 err = -EINVAL;
 315                 goto err_out_mailbox_free;
 316         }
 317
 318         mpt_entry = MAILBOX_ALIGN(mailbox);
 319
 320         mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS     |
 321                                        MTHCA_MPT_FLAG_MIO         |
 322                                        MTHCA_MPT_FLAG_REGION      |
 323                                        access);
 324
 325         mpt_entry->page_size = cpu_to_be32(buffer_size_shift - 12);
 326         mpt_entry->key       = cpu_to_be32(key);
 327         mpt_entry->pd        = cpu_to_be32(pd);
 328         mpt_entry->start     = cpu_to_be64(iova);
 329         mpt_entry->length    = cpu_to_be64(total_size);
 330         memset(&mpt_entry->lkey, 0,
 331                sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, lkey));
 332         mpt_entry->mtt_seg   = cpu_to_be64(dev->mr_table.mtt_base +
 333                                            mr->first_seg * dev->limits.mtt_seg_size);
 334
 335         if (0) {
 336                 mthca_dbg(dev, "Dumping MPT entry %08x:\n", mr->ibmr.lkey);
 337                 for (i = 0; i < sizeof (struct mthca_mpt_entry) / 4; ++i) {
 338                         if (i % 4 == 0)
 339                                 printk("[%02x] ", i * 4);
 340                         printk(" %08x", be32_to_cpu(((u32 *) mpt_entry)[i]));
 341                         if ((i + 1) % 4 == 0)
 342                                 printk("\n");
 343                 }
 344         }
 345
 346         err = mthca_SW2HW_MPT(dev, mpt_entry,
 347                               key & (dev->limits.num_mpts - 1),
 348                               &status);
 349         if (err)
 350                 mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
 351         else if (status) {
 352                 mthca_warn(dev, "SW2HW_MPT returned status 0x%02x\n",
 353                            status);
 354                 err = -EINVAL;
 355         }
 356
 357         kfree(mailbox);
 358         return err;
 359
 360 err_out_mailbox_free:
 361         kfree(mailbox);
 362
 363 err_out_free_mtt:
 364         mthca_free_mtt(dev, mr->first_seg, mr->order);
 365
 366 err_out_table:
 367         if (dev->hca_type == ARBEL_NATIVE)
 368                 mthca_table_put(dev, dev->mr_table.mpt_table, key);
 369
 370 err_out_mpt_free:
 371         mthca_free(&dev->mr_table.mpt_alloc, key);
 372         return err;
 373 }
 374
 375 void mthca_free_mr(struct mthca_dev *dev, struct mthca_mr *mr)
 376 {
 377         int err;
 378         u8 status;
 379
 380         might_sleep();
 381
 382         err = mthca_HW2SW_MPT(dev, NULL,
 383                               key_to_hw_index(dev, mr->ibmr.lkey) &
 384                               (dev->limits.num_mpts - 1),
 385                               &status);
 386         if (err)
 387                 mthca_warn(dev, "HW2SW_MPT failed (%d)\n", err);
 388         else if (status)
 389                 mthca_warn(dev, "HW2SW_MPT returned status 0x%02x\n",
 390                            status);
 391
 392         if (mr->order >= 0)
 393                 mthca_free_mtt(dev, mr->first_seg, mr->order);
 394
 395         if (dev->hca_type == ARBEL_NATIVE)
 396                 mthca_table_put(dev, dev->mr_table.mpt_table,
 397                                 key_to_hw_index(dev, mr->ibmr.lkey));
 398         mthca_free(&dev->mr_table.mpt_alloc, key_to_hw_index(dev, mr->ibmr.lkey));
 399 }
 400
 401 int __devinit mthca_init_mr_table(struct mthca_dev *dev)
 402 {
 403         int err;
 404         int i, s;
 405
 406         err = mthca_alloc_init(&dev->mr_table.mpt_alloc,
 407                                dev->limits.num_mpts,
 408                                ~0, dev->limits.reserved_mrws);
 409         if (err)
 410                 return err;
 411
 412         err = -ENOMEM;
 413
 414         for (i = 1, dev->mr_table.max_mtt_order = 0;
 415              i < dev->limits.num_mtt_segs;
 416              i <<= 1, ++dev->mr_table.max_mtt_order)
 417                 ; /* nothing */
 418
 419         dev->mr_table.mtt_buddy = kmalloc((dev->mr_table.max_mtt_order + 1) *
 420                                           sizeof (long *),
 421                                           GFP_KERNEL);
 422         if (!dev->mr_table.mtt_buddy)
 423                 goto err_out;
 424
 425         for (i = 0; i <= dev->mr_table.max_mtt_order; ++i)
 426                 dev->mr_table.mtt_buddy[i] = NULL;
 427
 428         for (i = 0; i <= dev->mr_table.max_mtt_order; ++i) {
 429                 s = BITS_TO_LONGS(1 << (dev->mr_table.max_mtt_order - i));
 430                 dev->mr_table.mtt_buddy[i] = kmalloc(s * sizeof (long),
 431                                                      GFP_KERNEL);
 432                 if (!dev->mr_table.mtt_buddy[i])
 433                         goto err_out_free;
 434                 bitmap_zero(dev->mr_table.mtt_buddy[i],
 435                             1 << (dev->mr_table.max_mtt_order - i));
 436         }
 437
 438         set_bit(0, dev->mr_table.mtt_buddy[dev->mr_table.max_mtt_order]);
 439
 440         for (i = 0; i < dev->mr_table.max_mtt_order; ++i)
 441                 if (1 << i >= dev->limits.reserved_mtts)
 442                         break;
 443
 444         if (i == dev->mr_table.max_mtt_order) {
 445                 mthca_err(dev, "MTT table of order %d is "
 446                           "too small.\n", i);
 447                 goto err_out_free;
 448         }
 449
 450         (void) mthca_alloc_mtt(dev, i);
 451
 452         return 0;
 453
 454  err_out_free:
 455         for (i = 0; i <= dev->mr_table.max_mtt_order; ++i)
 456                 kfree(dev->mr_table.mtt_buddy[i]);
 457
 458  err_out:
 459         mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);
 460
 461         return err;
 462 }
 463
 464 void __devexit mthca_cleanup_mr_table(struct mthca_dev *dev)
 465 {
 466         int i;
 467
 468         /* XXX check if any MRs are still allocated? */
 469         for (i = 0; i <= dev->mr_table.max_mtt_order; ++i)
 470                 kfree(dev->mr_table.mtt_buddy[i]);
 471         kfree(dev->mr_table.mtt_buddy);
 472         mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);
 473 }