drivers/infiniband/hw/ipath/ipath_mr.c

   1 /*
   2  * Copyright (c) 2006, 2007 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 <linux/slab.h>
  35
  36 #include <rdma/ib_umem.h>
  37 #include <rdma/ib_pack.h>
  38 #include <rdma/ib_smi.h>
  39
  40 #include "ipath_verbs.h"
  41
  42 /* Fast memory region */
  43 struct ipath_fmr {
  44         struct ib_fmr ibfmr;
  45         u8 page_shift;
  46         struct ipath_mregion mr;        /* must be last */
  47 };
  48
  49 static inline struct ipath_fmr *to_ifmr(struct ib_fmr *ibfmr)
  50 {
  51         return container_of(ibfmr, struct ipath_fmr, ibfmr);
  52 }
  53
  54 /**
  55  * ipath_get_dma_mr - get a DMA memory region
  56  * @pd: protection domain for this memory region
  57  * @acc: access flags
  58  *
  59  * Returns the memory region on success, otherwise returns an errno.
  60  * Note that all DMA addresses should be created via the
  61  * struct ib_dma_mapping_ops functions (see ipath_dma.c).
  62  */
  63 struct ib_mr *ipath_get_dma_mr(struct ib_pd *pd, int acc)
  64 {
  65         struct ipath_mr *mr;
  66         struct ib_mr *ret;
  67
  68         mr = kzalloc(sizeof *mr, GFP_KERNEL);
  69         if (!mr) {
  70                 ret = ERR_PTR(-ENOMEM);
  71                 goto bail;
  72         }
  73
  74         mr->mr.access_flags = acc;
  75         ret = &mr->ibmr;
  76
  77 bail:
  78         return ret;
  79 }
  80
  81 static struct ipath_mr *alloc_mr(int count,
  82                                  struct ipath_lkey_table *lk_table)
  83 {
  84         struct ipath_mr *mr;
  85         int m, i = 0;
  86
  87         /* Allocate struct plus pointers to first level page tables. */
  88         m = (count + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
  89         mr = kmalloc(sizeof *mr + m * sizeof mr->mr.map[0], GFP_KERNEL);
  90         if (!mr)
  91                 goto done;
  92
  93         /* Allocate first level page tables. */
  94         for (; i < m; i++) {
  95                 mr->mr.map[i] = kmalloc(sizeof *mr->mr.map[0], GFP_KERNEL);
  96                 if (!mr->mr.map[i])
  97                         goto bail;
  98         }
  99         mr->mr.mapsz = m;
 100
 101         /*
 102          * ib_reg_phys_mr() will initialize mr->ibmr except for
 103          * lkey and rkey.
 104          */
 105         if (!ipath_alloc_lkey(lk_table, &mr->mr))
 106                 goto bail;
 107         mr->ibmr.rkey = mr->ibmr.lkey = mr->mr.lkey;
 108
 109         goto done;
 110
 111 bail:
 112         while (i) {
 113                 i--;
 114                 kfree(mr->mr.map[i]);
 115         }
 116         kfree(mr);
 117         mr = NULL;
 118
 119 done:
 120         return mr;
 121 }
 122
 123 /**
 124  * ipath_reg_phys_mr - register a physical memory region
 125  * @pd: protection domain for this memory region
 126  * @buffer_list: pointer to the list of physical buffers to register
 127  * @num_phys_buf: the number of physical buffers to register
 128  * @iova_start: the starting address passed over IB which maps to this MR
 129  *
 130  * Returns the memory region on success, otherwise returns an errno.
 131  */
 132 struct ib_mr *ipath_reg_phys_mr(struct ib_pd *pd,
 133                                 struct ib_phys_buf *buffer_list,
 134                                 int num_phys_buf, int acc, u64 *iova_start)
 135 {
 136         struct ipath_mr *mr;
 137         int n, m, i;
 138         struct ib_mr *ret;
 139
 140         mr = alloc_mr(num_phys_buf, &to_idev(pd->device)->lk_table);
 141         if (mr == NULL) {
 142                 ret = ERR_PTR(-ENOMEM);
 143                 goto bail;
 144         }
 145
 146         mr->mr.pd = pd;
 147         mr->mr.user_base = *iova_start;
 148         mr->mr.iova = *iova_start;
 149         mr->mr.length = 0;
 150         mr->mr.offset = 0;
 151         mr->mr.access_flags = acc;
 152         mr->mr.max_segs = num_phys_buf;
 153         mr->umem = NULL;
 154
 155         m = 0;
 156         n = 0;
 157         for (i = 0; i < num_phys_buf; i++) {
 158                 mr->mr.map[m]->segs[n].vaddr = (void *) buffer_list[i].addr;
 159                 mr->mr.map[m]->segs[n].length = buffer_list[i].size;
 160                 mr->mr.length += buffer_list[i].size;
 161                 n++;
 162                 if (n == IPATH_SEGSZ) {
 163                         m++;
 164                         n = 0;
 165                 }
 166         }
 167
 168         ret = &mr->ibmr;
 169
 170 bail:
 171         return ret;
 172 }
 173
 174 /**
 175  * ipath_reg_user_mr - register a userspace memory region
 176  * @pd: protection domain for this memory region
 177  * @start: starting userspace address
 178  * @length: length of region to register
 179  * @virt_addr: virtual address to use (from HCA's point of view)
 180  * @mr_access_flags: access flags for this memory region
 181  * @udata: unused by the InfiniPath driver
 182  *
 183  * Returns the memory region on success, otherwise returns an errno.
 184  */
 185 struct ib_mr *ipath_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
 186                                 u64 virt_addr, int mr_access_flags,
 187                                 struct ib_udata *udata)
 188 {
 189         struct ipath_mr *mr;
 190         struct ib_umem *umem;
 191         struct ib_umem_chunk *chunk;
 192         int n, m, i;
 193         struct ib_mr *ret;
 194
 195         if (length == 0) {
 196                 ret = ERR_PTR(-EINVAL);
 197                 goto bail;
 198         }
 199
 200         umem = ib_umem_get(pd->uobject->context, start, length,
 201                            mr_access_flags, 0);
 202         if (IS_ERR(umem))
 203                 return (void *) umem;
 204
 205         n = 0;
 206         list_for_each_entry(chunk, &umem->chunk_list, list)
 207                 n += chunk->nents;
 208
 209         mr = alloc_mr(n, &to_idev(pd->device)->lk_table);
 210         if (!mr) {
 211                 ret = ERR_PTR(-ENOMEM);
 212                 ib_umem_release(umem);
 213                 goto bail;
 214         }
 215
 216         mr->mr.pd = pd;
 217         mr->mr.user_base = start;
 218         mr->mr.iova = virt_addr;
 219         mr->mr.length = length;
 220         mr->mr.offset = umem->offset;
 221         mr->mr.access_flags = mr_access_flags;
 222         mr->mr.max_segs = n;
 223         mr->umem = umem;
 224
 225         m = 0;
 226         n = 0;
 227         list_for_each_entry(chunk, &umem->chunk_list, list) {
 228                 for (i = 0; i < chunk->nents; i++) {
 229                         void *vaddr;
 230
 231                         vaddr = page_address(sg_page(&chunk->page_list[i]));
 232                         if (!vaddr) {
 233                                 ret = ERR_PTR(-EINVAL);
 234                                 goto bail;
 235                         }
 236                         mr->mr.map[m]->segs[n].vaddr = vaddr;
 237                         mr->mr.map[m]->segs[n].length = umem->page_size;
 238                         n++;
 239                         if (n == IPATH_SEGSZ) {
 240                                 m++;
 241                                 n = 0;
 242                         }
 243                 }
 244         }
 245         ret = &mr->ibmr;
 246
 247 bail:
 248         return ret;
 249 }
 250
 251 /**
 252  * ipath_dereg_mr - unregister and free a memory region
 253  * @ibmr: the memory region to free
 254  *
 255  * Returns 0 on success.
 256  *
 257  * Note that this is called to free MRs created by ipath_get_dma_mr()
 258  * or ipath_reg_user_mr().
 259  */
 260 int ipath_dereg_mr(struct ib_mr *ibmr)
 261 {
 262         struct ipath_mr *mr = to_imr(ibmr);
 263         int i;
 264
 265         ipath_free_lkey(&to_idev(ibmr->device)->lk_table, ibmr->lkey);
 266         i = mr->mr.mapsz;
 267         while (i) {
 268                 i--;
 269                 kfree(mr->mr.map[i]);
 270         }
 271
 272         if (mr->umem)
 273                 ib_umem_release(mr->umem);
 274
 275         kfree(mr);
 276         return 0;
 277 }
 278
 279 /**
 280  * ipath_alloc_fmr - allocate a fast memory region
 281  * @pd: the protection domain for this memory region
 282  * @mr_access_flags: access flags for this memory region
 283  * @fmr_attr: fast memory region attributes
 284  *
 285  * Returns the memory region on success, otherwise returns an errno.
 286  */
 287 struct ib_fmr *ipath_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
 288                                struct ib_fmr_attr *fmr_attr)
 289 {
 290         struct ipath_fmr *fmr;
 291         int m, i = 0;
 292         struct ib_fmr *ret;
 293
 294         /* Allocate struct plus pointers to first level page tables. */
 295         m = (fmr_attr->max_pages + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
 296         fmr = kmalloc(sizeof *fmr + m * sizeof fmr->mr.map[0], GFP_KERNEL);
 297         if (!fmr)
 298                 goto bail;
 299
 300         /* Allocate first level page tables. */
 301         for (; i < m; i++) {
 302                 fmr->mr.map[i] = kmalloc(sizeof *fmr->mr.map[0],
 303                                          GFP_KERNEL);
 304                 if (!fmr->mr.map[i])
 305                         goto bail;
 306         }
 307         fmr->mr.mapsz = m;
 308
 309         /*
 310          * ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
 311          * rkey.
 312          */
 313         if (!ipath_alloc_lkey(&to_idev(pd->device)->lk_table, &fmr->mr))
 314                 goto bail;
 315         fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mr.lkey;
 316         /*
 317          * Resources are allocated but no valid mapping (RKEY can't be
 318          * used).
 319          */
 320         fmr->mr.pd = pd;
 321         fmr->mr.user_base = 0;
 322         fmr->mr.iova = 0;
 323         fmr->mr.length = 0;
 324         fmr->mr.offset = 0;
 325         fmr->mr.access_flags = mr_access_flags;
 326         fmr->mr.max_segs = fmr_attr->max_pages;
 327         fmr->page_shift = fmr_attr->page_shift;
 328
 329         ret = &fmr->ibfmr;
 330         goto done;
 331
 332 bail:
 333         while (i)
 334                 kfree(fmr->mr.map[--i]);
 335         kfree(fmr);
 336         ret = ERR_PTR(-ENOMEM);
 337
 338 done:
 339         return ret;
 340 }
 341
 342 /**
 343  * ipath_map_phys_fmr - set up a fast memory region
 344  * @ibmfr: the fast memory region to set up
 345  * @page_list: the list of pages to associate with the fast memory region
 346  * @list_len: the number of pages to associate with the fast memory region
 347  * @iova: the virtual address of the start of the fast memory region
 348  *
 349  * This may be called from interrupt context.
 350  */
 351
 352 int ipath_map_phys_fmr(struct ib_fmr *ibfmr, u64 * page_list,
 353                        int list_len, u64 iova)
 354 {
 355         struct ipath_fmr *fmr = to_ifmr(ibfmr);
 356         struct ipath_lkey_table *rkt;
 357         unsigned long flags;
 358         int m, n, i;
 359         u32 ps;
 360         int ret;
 361
 362         if (list_len > fmr->mr.max_segs) {
 363                 ret = -EINVAL;
 364                 goto bail;
 365         }
 366         rkt = &to_idev(ibfmr->device)->lk_table;
 367         spin_lock_irqsave(&rkt->lock, flags);
 368         fmr->mr.user_base = iova;
 369         fmr->mr.iova = iova;
 370         ps = 1 << fmr->page_shift;
 371         fmr->mr.length = list_len * ps;
 372         m = 0;
 373         n = 0;
 374         ps = 1 << fmr->page_shift;
 375         for (i = 0; i < list_len; i++) {
 376                 fmr->mr.map[m]->segs[n].vaddr = (void *) page_list[i];
 377                 fmr->mr.map[m]->segs[n].length = ps;
 378                 if (++n == IPATH_SEGSZ) {
 379                         m++;
 380                         n = 0;
 381                 }
 382         }
 383         spin_unlock_irqrestore(&rkt->lock, flags);
 384         ret = 0;
 385
 386 bail:
 387         return ret;
 388 }
 389
 390 /**
 391  * ipath_unmap_fmr - unmap fast memory regions
 392  * @fmr_list: the list of fast memory regions to unmap
 393  *
 394  * Returns 0 on success.
 395  */
 396 int ipath_unmap_fmr(struct list_head *fmr_list)
 397 {
 398         struct ipath_fmr *fmr;
 399         struct ipath_lkey_table *rkt;
 400         unsigned long flags;
 401
 402         list_for_each_entry(fmr, fmr_list, ibfmr.list) {
 403                 rkt = &to_idev(fmr->ibfmr.device)->lk_table;
 404                 spin_lock_irqsave(&rkt->lock, flags);
 405                 fmr->mr.user_base = 0;
 406                 fmr->mr.iova = 0;
 407                 fmr->mr.length = 0;
 408                 spin_unlock_irqrestore(&rkt->lock, flags);
 409         }
 410         return 0;
 411 }
 412
 413 /**
 414  * ipath_dealloc_fmr - deallocate a fast memory region
 415  * @ibfmr: the fast memory region to deallocate
 416  *
 417  * Returns 0 on success.
 418  */
 419 int ipath_dealloc_fmr(struct ib_fmr *ibfmr)
 420 {
 421         struct ipath_fmr *fmr = to_ifmr(ibfmr);
 422         int i;
 423
 424         ipath_free_lkey(&to_idev(ibfmr->device)->lk_table, ibfmr->lkey);
 425         i = fmr->mr.mapsz;
 426         while (i)
 427                 kfree(fmr->mr.map[--i]);
 428         kfree(fmr);
 429         return 0;
 430 }