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