2 * Copyright (c) 2006 QLogic, Inc. All rights reserved.
3 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
34 #include <rdma/ib_pack.h>
35 #include <rdma/ib_smi.h>
37 #include "ipath_verbs.h"
39 /* Fast memory region */
43 struct ipath_mregion mr; /* must be last */
46 static inline struct ipath_fmr *to_ifmr(struct ib_fmr *ibfmr)
48 return container_of(ibfmr, struct ipath_fmr, ibfmr);
52 * ipath_get_dma_mr - get a DMA memory region
53 * @pd: protection domain for this memory region
56 * Returns the memory region on success, otherwise returns an errno.
58 struct ib_mr *ipath_get_dma_mr(struct ib_pd *pd, int acc)
63 mr = kzalloc(sizeof *mr, GFP_KERNEL);
65 ret = ERR_PTR(-ENOMEM);
69 mr->mr.access_flags = acc;
76 static struct ipath_mr *alloc_mr(int count,
77 struct ipath_lkey_table *lk_table)
82 /* Allocate struct plus pointers to first level page tables. */
83 m = (count + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
84 mr = kmalloc(sizeof *mr + m * sizeof mr->mr.map[0], GFP_KERNEL);
88 /* Allocate first level page tables. */
90 mr->mr.map[i] = kmalloc(sizeof *mr->mr.map[0], GFP_KERNEL);
97 * ib_reg_phys_mr() will initialize mr->ibmr except for
100 if (!ipath_alloc_lkey(lk_table, &mr->mr))
102 mr->ibmr.rkey = mr->ibmr.lkey = mr->mr.lkey;
109 kfree(mr->mr.map[i]);
119 * ipath_reg_phys_mr - register a physical memory region
120 * @pd: protection domain for this memory region
121 * @buffer_list: pointer to the list of physical buffers to register
122 * @num_phys_buf: the number of physical buffers to register
123 * @iova_start: the starting address passed over IB which maps to this MR
125 * Returns the memory region on success, otherwise returns an errno.
127 struct ib_mr *ipath_reg_phys_mr(struct ib_pd *pd,
128 struct ib_phys_buf *buffer_list,
129 int num_phys_buf, int acc, u64 *iova_start)
135 mr = alloc_mr(num_phys_buf, &to_idev(pd->device)->lk_table);
137 ret = ERR_PTR(-ENOMEM);
141 mr->mr.user_base = *iova_start;
142 mr->mr.iova = *iova_start;
145 mr->mr.access_flags = acc;
146 mr->mr.max_segs = num_phys_buf;
150 for (i = 0; i < num_phys_buf; i++) {
151 mr->mr.map[m]->segs[n].vaddr =
152 phys_to_virt(buffer_list[i].addr);
153 mr->mr.map[m]->segs[n].length = buffer_list[i].size;
154 mr->mr.length += buffer_list[i].size;
156 if (n == IPATH_SEGSZ) {
169 * ipath_reg_user_mr - register a userspace memory region
170 * @pd: protection domain for this memory region
171 * @region: the user memory region
172 * @mr_access_flags: access flags for this memory region
173 * @udata: unused by the InfiniPath driver
175 * Returns the memory region on success, otherwise returns an errno.
177 struct ib_mr *ipath_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
178 int mr_access_flags, struct ib_udata *udata)
181 struct ib_umem_chunk *chunk;
185 if (region->length == 0) {
186 ret = ERR_PTR(-EINVAL);
191 list_for_each_entry(chunk, ®ion->chunk_list, list)
194 mr = alloc_mr(n, &to_idev(pd->device)->lk_table);
196 ret = ERR_PTR(-ENOMEM);
200 mr->mr.user_base = region->user_base;
201 mr->mr.iova = region->virt_base;
202 mr->mr.length = region->length;
203 mr->mr.offset = region->offset;
204 mr->mr.access_flags = mr_access_flags;
209 list_for_each_entry(chunk, ®ion->chunk_list, list) {
210 for (i = 0; i < chunk->nmap; i++) {
211 mr->mr.map[m]->segs[n].vaddr =
212 page_address(chunk->page_list[i].page);
213 mr->mr.map[m]->segs[n].length = region->page_size;
215 if (n == IPATH_SEGSZ) {
228 * ipath_dereg_mr - unregister and free a memory region
229 * @ibmr: the memory region to free
231 * Returns 0 on success.
233 * Note that this is called to free MRs created by ipath_get_dma_mr()
234 * or ipath_reg_user_mr().
236 int ipath_dereg_mr(struct ib_mr *ibmr)
238 struct ipath_mr *mr = to_imr(ibmr);
241 ipath_free_lkey(&to_idev(ibmr->device)->lk_table, ibmr->lkey);
245 kfree(mr->mr.map[i]);
252 * ipath_alloc_fmr - allocate a fast memory region
253 * @pd: the protection domain for this memory region
254 * @mr_access_flags: access flags for this memory region
255 * @fmr_attr: fast memory region attributes
257 * Returns the memory region on success, otherwise returns an errno.
259 struct ib_fmr *ipath_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
260 struct ib_fmr_attr *fmr_attr)
262 struct ipath_fmr *fmr;
266 /* Allocate struct plus pointers to first level page tables. */
267 m = (fmr_attr->max_pages + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
268 fmr = kmalloc(sizeof *fmr + m * sizeof fmr->mr.map[0], GFP_KERNEL);
272 /* Allocate first level page tables. */
274 fmr->mr.map[i] = kmalloc(sizeof *fmr->mr.map[0],
282 * ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
285 if (!ipath_alloc_lkey(&to_idev(pd->device)->lk_table, &fmr->mr))
287 fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mr.lkey;
289 * Resources are allocated but no valid mapping (RKEY can't be
292 fmr->mr.user_base = 0;
296 fmr->mr.access_flags = mr_access_flags;
297 fmr->mr.max_segs = fmr_attr->max_pages;
298 fmr->page_shift = fmr_attr->page_shift;
305 kfree(fmr->mr.map[--i]);
307 ret = ERR_PTR(-ENOMEM);
314 * ipath_map_phys_fmr - set up a fast memory region
315 * @ibmfr: the fast memory region to set up
316 * @page_list: the list of pages to associate with the fast memory region
317 * @list_len: the number of pages to associate with the fast memory region
318 * @iova: the virtual address of the start of the fast memory region
320 * This may be called from interrupt context.
323 int ipath_map_phys_fmr(struct ib_fmr *ibfmr, u64 * page_list,
324 int list_len, u64 iova)
326 struct ipath_fmr *fmr = to_ifmr(ibfmr);
327 struct ipath_lkey_table *rkt;
333 if (list_len > fmr->mr.max_segs) {
337 rkt = &to_idev(ibfmr->device)->lk_table;
338 spin_lock_irqsave(&rkt->lock, flags);
339 fmr->mr.user_base = iova;
341 ps = 1 << fmr->page_shift;
342 fmr->mr.length = list_len * ps;
345 ps = 1 << fmr->page_shift;
346 for (i = 0; i < list_len; i++) {
347 fmr->mr.map[m]->segs[n].vaddr = phys_to_virt(page_list[i]);
348 fmr->mr.map[m]->segs[n].length = ps;
349 if (++n == IPATH_SEGSZ) {
354 spin_unlock_irqrestore(&rkt->lock, flags);
362 * ipath_unmap_fmr - unmap fast memory regions
363 * @fmr_list: the list of fast memory regions to unmap
365 * Returns 0 on success.
367 int ipath_unmap_fmr(struct list_head *fmr_list)
369 struct ipath_fmr *fmr;
370 struct ipath_lkey_table *rkt;
373 list_for_each_entry(fmr, fmr_list, ibfmr.list) {
374 rkt = &to_idev(fmr->ibfmr.device)->lk_table;
375 spin_lock_irqsave(&rkt->lock, flags);
376 fmr->mr.user_base = 0;
379 spin_unlock_irqrestore(&rkt->lock, flags);
385 * ipath_dealloc_fmr - deallocate a fast memory region
386 * @ibfmr: the fast memory region to deallocate
388 * Returns 0 on success.
390 int ipath_dealloc_fmr(struct ib_fmr *ibfmr)
392 struct ipath_fmr *fmr = to_ifmr(ibfmr);
395 ipath_free_lkey(&to_idev(ibfmr->device)->lk_table, ibfmr->lkey);
398 kfree(fmr->mr.map[--i]);