drivers/infiniband/hw/qib/qib_mr.c

   1 /*
   2  * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
   3  * Copyright (c) 2005, 2006 PathScale, 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 <rdma/ib_umem.h>
  35 #include <rdma/ib_smi.h>
  36
  37 #include "qib.h"
  38
  39 /* Fast memory region */
  40 struct qib_fmr {
  41         struct ib_fmr ibfmr;
  42         struct qib_mregion mr;        /* must be last */
  43 };
  44
  45 static inline struct qib_fmr *to_ifmr(struct ib_fmr *ibfmr)
  46 {
  47         return container_of(ibfmr, struct qib_fmr, ibfmr);
  48 }
  49
  50 static int init_qib_mregion(struct qib_mregion *mr, struct ib_pd *pd,
  51         int count)
  52 {
  53         int m, i = 0;
  54         int rval = 0;
  55
  56         m = (count + QIB_SEGSZ - 1) / QIB_SEGSZ;
  57         for (; i < m; i++) {
  58                 mr->map[i] = kzalloc(sizeof(*mr->map[0]), GFP_KERNEL);
  59                 if (!mr->map[i])
  60                         goto bail;
  61         }
  62         mr->mapsz = m;
  63         init_completion(&mr->comp);
  64         /* count returning the ptr to user */
  65         atomic_set(&mr->refcount, 1);
  66         mr->pd = pd;
  67         mr->max_segs = count;
  68 out:
  69         return rval;
  70 bail:
  71         while (i)
  72                 kfree(mr->map[--i]);
  73         rval = -ENOMEM;
  74         goto out;
  75 }
  76
  77 static void deinit_qib_mregion(struct qib_mregion *mr)
  78 {
  79         int i = mr->mapsz;
  80
  81         mr->mapsz = 0;
  82         while (i)
  83                 kfree(mr->map[--i]);
  84 }
  85
  86
  87 /**
  88  * qib_get_dma_mr - get a DMA memory region
  89  * @pd: protection domain for this memory region
  90  * @acc: access flags
  91  *
  92  * Returns the memory region on success, otherwise returns an errno.
  93  * Note that all DMA addresses should be created via the
  94  * struct ib_dma_mapping_ops functions (see qib_dma.c).
  95  */
  96 struct ib_mr *qib_get_dma_mr(struct ib_pd *pd, int acc)
  97 {
  98         struct qib_mr *mr = NULL;
  99         struct ib_mr *ret;
 100         int rval;
 101
 102         if (to_ipd(pd)->user) {
 103                 ret = ERR_PTR(-EPERM);
 104                 goto bail;
 105         }
 106
 107         mr = kzalloc(sizeof(*mr), GFP_KERNEL);
 108         if (!mr) {
 109                 ret = ERR_PTR(-ENOMEM);
 110                 goto bail;
 111         }
 112
 113         rval = init_qib_mregion(&mr->mr, pd, 0);
 114         if (rval) {
 115                 ret = ERR_PTR(rval);
 116                 goto bail;
 117         }
 118
 119
 120         rval = qib_alloc_lkey(&mr->mr, 1);
 121         if (rval) {
 122                 ret = ERR_PTR(rval);
 123                 goto bail_mregion;
 124         }
 125
 126         mr->mr.access_flags = acc;
 127         ret = &mr->ibmr;
 128 done:
 129         return ret;
 130
 131 bail_mregion:
 132         deinit_qib_mregion(&mr->mr);
 133 bail:
 134         kfree(mr);
 135         goto done;
 136 }
 137
 138 static struct qib_mr *alloc_mr(int count, struct ib_pd *pd)
 139 {
 140         struct qib_mr *mr;
 141         int rval = -ENOMEM;
 142         int m;
 143
 144         /* Allocate struct plus pointers to first level page tables. */
 145         m = (count + QIB_SEGSZ - 1) / QIB_SEGSZ;
 146         mr = kzalloc(sizeof(*mr) + m * sizeof(mr->mr.map[0]), GFP_KERNEL);
 147         if (!mr)
 148                 goto bail;
 149
 150         rval = init_qib_mregion(&mr->mr, pd, count);
 151         if (rval)
 152                 goto bail;
 153         /*
 154          * ib_reg_phys_mr() will initialize mr->ibmr except for
 155          * lkey and rkey.
 156          */
 157         rval = qib_alloc_lkey(&mr->mr, 0);
 158         if (rval)
 159                 goto bail_mregion;
 160         mr->ibmr.lkey = mr->mr.lkey;
 161         mr->ibmr.rkey = mr->mr.lkey;
 162 done:
 163         return mr;
 164
 165 bail_mregion:
 166         deinit_qib_mregion(&mr->mr);
 167 bail:
 168         kfree(mr);
 169         mr = ERR_PTR(rval);
 170         goto done;
 171 }
 172
 173 /**
 174  * qib_reg_phys_mr - register a physical memory region
 175  * @pd: protection domain for this memory region
 176  * @buffer_list: pointer to the list of physical buffers to register
 177  * @num_phys_buf: the number of physical buffers to register
 178  * @iova_start: the starting address passed over IB which maps to this MR
 179  *
 180  * Returns the memory region on success, otherwise returns an errno.
 181  */
 182 struct ib_mr *qib_reg_phys_mr(struct ib_pd *pd,
 183                               struct ib_phys_buf *buffer_list,
 184                               int num_phys_buf, int acc, u64 *iova_start)
 185 {
 186         struct qib_mr *mr;
 187         int n, m, i;
 188         struct ib_mr *ret;
 189
 190         mr = alloc_mr(num_phys_buf, pd);
 191         if (IS_ERR(mr)) {
 192                 ret = (struct ib_mr *)mr;
 193                 goto bail;
 194         }
 195
 196         mr->mr.user_base = *iova_start;
 197         mr->mr.iova = *iova_start;
 198         mr->mr.access_flags = acc;
 199
 200         m = 0;
 201         n = 0;
 202         for (i = 0; i < num_phys_buf; i++) {
 203                 mr->mr.map[m]->segs[n].vaddr = (void *) buffer_list[i].addr;
 204                 mr->mr.map[m]->segs[n].length = buffer_list[i].size;
 205                 mr->mr.length += buffer_list[i].size;
 206                 n++;
 207                 if (n == QIB_SEGSZ) {
 208                         m++;
 209                         n = 0;
 210                 }
 211         }
 212
 213         ret = &mr->ibmr;
 214
 215 bail:
 216         return ret;
 217 }
 218
 219 /**
 220  * qib_reg_user_mr - register a userspace memory region
 221  * @pd: protection domain for this memory region
 222  * @start: starting userspace address
 223  * @length: length of region to register
 224  * @mr_access_flags: access flags for this memory region
 225  * @udata: unused by the QLogic_IB driver
 226  *
 227  * Returns the memory region on success, otherwise returns an errno.
 228  */
 229 struct ib_mr *qib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
 230                               u64 virt_addr, int mr_access_flags,
 231                               struct ib_udata *udata)
 232 {
 233         struct qib_mr *mr;
 234         struct ib_umem *umem;
 235         struct scatterlist *sg;
 236         int n, m, entry;
 237         struct ib_mr *ret;
 238
 239         if (length == 0) {
 240                 ret = ERR_PTR(-EINVAL);
 241                 goto bail;
 242         }
 243
 244         umem = ib_umem_get(pd->uobject->context, start, length,
 245                            mr_access_flags, 0);
 246         if (IS_ERR(umem))
 247                 return (void *) umem;
 248
 249         n = umem->nmap;
 250
 251         mr = alloc_mr(n, pd);
 252         if (IS_ERR(mr)) {
 253                 ret = (struct ib_mr *)mr;
 254                 ib_umem_release(umem);
 255                 goto bail;
 256         }
 257
 258         mr->mr.user_base = start;
 259         mr->mr.iova = virt_addr;
 260         mr->mr.length = length;
 261         mr->mr.offset = ib_umem_offset(umem);
 262         mr->mr.access_flags = mr_access_flags;
 263         mr->umem = umem;
 264
 265         if (is_power_of_2(umem->page_size))
 266                 mr->mr.page_shift = ilog2(umem->page_size);
 267         m = 0;
 268         n = 0;
 269         for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
 270                         void *vaddr;
 271
 272                         vaddr = page_address(sg_page(sg));
 273                         if (!vaddr) {
 274                                 ret = ERR_PTR(-EINVAL);
 275                                 goto bail;
 276                         }
 277                         mr->mr.map[m]->segs[n].vaddr = vaddr;
 278                         mr->mr.map[m]->segs[n].length = umem->page_size;
 279                         n++;
 280                         if (n == QIB_SEGSZ) {
 281                                 m++;
 282                                 n = 0;
 283                         }
 284         }
 285         ret = &mr->ibmr;
 286
 287 bail:
 288         return ret;
 289 }
 290
 291 /**
 292  * qib_dereg_mr - unregister and free a memory region
 293  * @ibmr: the memory region to free
 294  *
 295  * Returns 0 on success.
 296  *
 297  * Note that this is called to free MRs created by qib_get_dma_mr()
 298  * or qib_reg_user_mr().
 299  */
 300 int qib_dereg_mr(struct ib_mr *ibmr)
 301 {
 302         struct qib_mr *mr = to_imr(ibmr);
 303         int ret = 0;
 304         unsigned long timeout;
 305
 306         qib_free_lkey(&mr->mr);
 307
 308         qib_put_mr(&mr->mr); /* will set completion if last */
 309         timeout = wait_for_completion_timeout(&mr->mr.comp,
 310                 5 * HZ);
 311         if (!timeout) {
 312                 qib_get_mr(&mr->mr);
 313                 ret = -EBUSY;
 314                 goto out;
 315         }
 316         deinit_qib_mregion(&mr->mr);
 317         if (mr->umem)
 318                 ib_umem_release(mr->umem);
 319         kfree(mr);
 320 out:
 321         return ret;
 322 }
 323
 324 /*
 325  * Allocate a memory region usable with the
 326  * IB_WR_FAST_REG_MR send work request.
 327  *
 328  * Return the memory region on success, otherwise return an errno.
 329  */
 330 struct ib_mr *qib_alloc_fast_reg_mr(struct ib_pd *pd, int max_page_list_len)
 331 {
 332         struct qib_mr *mr;
 333
 334         mr = alloc_mr(max_page_list_len, pd);
 335         if (IS_ERR(mr))
 336                 return (struct ib_mr *)mr;
 337
 338         return &mr->ibmr;
 339 }
 340
 341 struct ib_fast_reg_page_list *
 342 qib_alloc_fast_reg_page_list(struct ib_device *ibdev, int page_list_len)
 343 {
 344         unsigned size = page_list_len * sizeof(u64);
 345         struct ib_fast_reg_page_list *pl;
 346
 347         if (size > PAGE_SIZE)
 348                 return ERR_PTR(-EINVAL);
 349
 350         pl = kzalloc(sizeof(*pl), GFP_KERNEL);
 351         if (!pl)
 352                 return ERR_PTR(-ENOMEM);
 353
 354         pl->page_list = kzalloc(size, GFP_KERNEL);
 355         if (!pl->page_list)
 356                 goto err_free;
 357
 358         return pl;
 359
 360 err_free:
 361         kfree(pl);
 362         return ERR_PTR(-ENOMEM);
 363 }
 364
 365 void qib_free_fast_reg_page_list(struct ib_fast_reg_page_list *pl)
 366 {
 367         kfree(pl->page_list);
 368         kfree(pl);
 369 }
 370
 371 /**
 372  * qib_alloc_fmr - allocate a fast memory region
 373  * @pd: the protection domain for this memory region
 374  * @mr_access_flags: access flags for this memory region
 375  * @fmr_attr: fast memory region attributes
 376  *
 377  * Returns the memory region on success, otherwise returns an errno.
 378  */
 379 struct ib_fmr *qib_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
 380                              struct ib_fmr_attr *fmr_attr)
 381 {
 382         struct qib_fmr *fmr;
 383         int m;
 384         struct ib_fmr *ret;
 385         int rval = -ENOMEM;
 386
 387         /* Allocate struct plus pointers to first level page tables. */
 388         m = (fmr_attr->max_pages + QIB_SEGSZ - 1) / QIB_SEGSZ;
 389         fmr = kzalloc(sizeof(*fmr) + m * sizeof(fmr->mr.map[0]), GFP_KERNEL);
 390         if (!fmr)
 391                 goto bail;
 392
 393         rval = init_qib_mregion(&fmr->mr, pd, fmr_attr->max_pages);
 394         if (rval)
 395                 goto bail;
 396
 397         /*
 398          * ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
 399          * rkey.
 400          */
 401         rval = qib_alloc_lkey(&fmr->mr, 0);
 402         if (rval)
 403                 goto bail_mregion;
 404         fmr->ibfmr.rkey = fmr->mr.lkey;
 405         fmr->ibfmr.lkey = fmr->mr.lkey;
 406         /*
 407          * Resources are allocated but no valid mapping (RKEY can't be
 408          * used).
 409          */
 410         fmr->mr.access_flags = mr_access_flags;
 411         fmr->mr.max_segs = fmr_attr->max_pages;
 412         fmr->mr.page_shift = fmr_attr->page_shift;
 413
 414         ret = &fmr->ibfmr;
 415 done:
 416         return ret;
 417
 418 bail_mregion:
 419         deinit_qib_mregion(&fmr->mr);
 420 bail:
 421         kfree(fmr);
 422         ret = ERR_PTR(rval);
 423         goto done;
 424 }
 425
 426 /**
 427  * qib_map_phys_fmr - set up a fast memory region
 428  * @ibmfr: the fast memory region to set up
 429  * @page_list: the list of pages to associate with the fast memory region
 430  * @list_len: the number of pages to associate with the fast memory region
 431  * @iova: the virtual address of the start of the fast memory region
 432  *
 433  * This may be called from interrupt context.
 434  */
 435
 436 int qib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
 437                      int list_len, u64 iova)
 438 {
 439         struct qib_fmr *fmr = to_ifmr(ibfmr);
 440         struct qib_lkey_table *rkt;
 441         unsigned long flags;
 442         int m, n, i;
 443         u32 ps;
 444         int ret;
 445
 446         i = atomic_read(&fmr->mr.refcount);
 447         if (i > 2)
 448                 return -EBUSY;
 449
 450         if (list_len > fmr->mr.max_segs) {
 451                 ret = -EINVAL;
 452                 goto bail;
 453         }
 454         rkt = &to_idev(ibfmr->device)->lk_table;
 455         spin_lock_irqsave(&rkt->lock, flags);
 456         fmr->mr.user_base = iova;
 457         fmr->mr.iova = iova;
 458         ps = 1 << fmr->mr.page_shift;
 459         fmr->mr.length = list_len * ps;
 460         m = 0;
 461         n = 0;
 462         for (i = 0; i < list_len; i++) {
 463                 fmr->mr.map[m]->segs[n].vaddr = (void *) page_list[i];
 464                 fmr->mr.map[m]->segs[n].length = ps;
 465                 if (++n == QIB_SEGSZ) {
 466                         m++;
 467                         n = 0;
 468                 }
 469         }
 470         spin_unlock_irqrestore(&rkt->lock, flags);
 471         ret = 0;
 472
 473 bail:
 474         return ret;
 475 }
 476
 477 /**
 478  * qib_unmap_fmr - unmap fast memory regions
 479  * @fmr_list: the list of fast memory regions to unmap
 480  *
 481  * Returns 0 on success.
 482  */
 483 int qib_unmap_fmr(struct list_head *fmr_list)
 484 {
 485         struct qib_fmr *fmr;
 486         struct qib_lkey_table *rkt;
 487         unsigned long flags;
 488
 489         list_for_each_entry(fmr, fmr_list, ibfmr.list) {
 490                 rkt = &to_idev(fmr->ibfmr.device)->lk_table;
 491                 spin_lock_irqsave(&rkt->lock, flags);
 492                 fmr->mr.user_base = 0;
 493                 fmr->mr.iova = 0;
 494                 fmr->mr.length = 0;
 495                 spin_unlock_irqrestore(&rkt->lock, flags);
 496         }
 497         return 0;
 498 }
 499
 500 /**
 501  * qib_dealloc_fmr - deallocate a fast memory region
 502  * @ibfmr: the fast memory region to deallocate
 503  *
 504  * Returns 0 on success.
 505  */
 506 int qib_dealloc_fmr(struct ib_fmr *ibfmr)
 507 {
 508         struct qib_fmr *fmr = to_ifmr(ibfmr);
 509         int ret = 0;
 510         unsigned long timeout;
 511
 512         qib_free_lkey(&fmr->mr);
 513         qib_put_mr(&fmr->mr); /* will set completion if last */
 514         timeout = wait_for_completion_timeout(&fmr->mr.comp,
 515                 5 * HZ);
 516         if (!timeout) {
 517                 qib_get_mr(&fmr->mr);
 518                 ret = -EBUSY;
 519                 goto out;
 520         }
 521         deinit_qib_mregion(&fmr->mr);
 522         kfree(fmr);
 523 out:
 524         return ret;
 525 }
 526
 527 void mr_rcu_callback(struct rcu_head *list)
 528 {
 529         struct qib_mregion *mr = container_of(list, struct qib_mregion, list);
 530
 531         complete(&mr->comp);
 532 }