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