drivers/infiniband/hw/ipath/ipath_mr.c

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