2 * Copyright (c) 2006, 2007 QLogic Corporation. 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
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30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 #include <rdma/ib_umem.h>
35 #include <rdma/ib_pack.h>
36 #include <rdma/ib_smi.h>
38 #include "ipath_verbs.h"
40 /* Fast memory region */
44 struct ipath_mregion mr; /* must be last */
47 static inline struct ipath_fmr *to_ifmr(struct ib_fmr *ibfmr)
49 return container_of(ibfmr, struct ipath_fmr, ibfmr);
53 * ipath_get_dma_mr - get a DMA memory region
54 * @pd: protection domain for this memory region
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).
61 struct ib_mr *ipath_get_dma_mr(struct ib_pd *pd, int acc)
66 mr = kzalloc(sizeof *mr, GFP_KERNEL);
68 ret = ERR_PTR(-ENOMEM);
72 mr->mr.access_flags = acc;
79 static struct ipath_mr *alloc_mr(int count,
80 struct ipath_lkey_table *lk_table)
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);
91 /* Allocate first level page tables. */
93 mr->mr.map[i] = kmalloc(sizeof *mr->mr.map[0], GFP_KERNEL);
100 * ib_reg_phys_mr() will initialize mr->ibmr except for
103 if (!ipath_alloc_lkey(lk_table, &mr->mr))
105 mr->ibmr.rkey = mr->ibmr.lkey = mr->mr.lkey;
112 kfree(mr->mr.map[i]);
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
128 * Returns the memory region on success, otherwise returns an errno.
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)
138 mr = alloc_mr(num_phys_buf, &to_idev(pd->device)->lk_table);
140 ret = ERR_PTR(-ENOMEM);
145 mr->mr.user_base = *iova_start;
146 mr->mr.iova = *iova_start;
149 mr->mr.access_flags = acc;
150 mr->mr.max_segs = num_phys_buf;
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;
160 if (n == IPATH_SEGSZ) {
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
181 * Returns the memory region on success, otherwise returns an errno.
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)
188 struct ib_umem *umem;
189 struct ib_umem_chunk *chunk;
194 ret = ERR_PTR(-EINVAL);
198 umem = ib_umem_get(pd->uobject->context, start, length,
201 return (void *) umem;
204 list_for_each_entry(chunk, &umem->chunk_list, list)
207 mr = alloc_mr(n, &to_idev(pd->device)->lk_table);
209 ret = ERR_PTR(-ENOMEM);
210 ib_umem_release(umem);
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;
225 list_for_each_entry(chunk, &umem->chunk_list, list) {
226 for (i = 0; i < chunk->nents; i++) {
229 vaddr = page_address(sg_page(&chunk->page_list[i]));
231 ret = ERR_PTR(-EINVAL);
234 mr->mr.map[m]->segs[n].vaddr = vaddr;
235 mr->mr.map[m]->segs[n].length = umem->page_size;
237 if (n == IPATH_SEGSZ) {
250 * ipath_dereg_mr - unregister and free a memory region
251 * @ibmr: the memory region to free
253 * Returns 0 on success.
255 * Note that this is called to free MRs created by ipath_get_dma_mr()
256 * or ipath_reg_user_mr().
258 int ipath_dereg_mr(struct ib_mr *ibmr)
260 struct ipath_mr *mr = to_imr(ibmr);
263 ipath_free_lkey(&to_idev(ibmr->device)->lk_table, ibmr->lkey);
267 kfree(mr->mr.map[i]);
271 ib_umem_release(mr->umem);
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
283 * Returns the memory region on success, otherwise returns an errno.
285 struct ib_fmr *ipath_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
286 struct ib_fmr_attr *fmr_attr)
288 struct ipath_fmr *fmr;
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);
298 /* Allocate first level page tables. */
300 fmr->mr.map[i] = kmalloc(sizeof *fmr->mr.map[0],
308 * ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
311 if (!ipath_alloc_lkey(&to_idev(pd->device)->lk_table, &fmr->mr))
313 fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mr.lkey;
315 * Resources are allocated but no valid mapping (RKEY can't be
319 fmr->mr.user_base = 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;
332 kfree(fmr->mr.map[--i]);
334 ret = ERR_PTR(-ENOMEM);
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
347 * This may be called from interrupt context.
350 int ipath_map_phys_fmr(struct ib_fmr *ibfmr, u64 * page_list,
351 int list_len, u64 iova)
353 struct ipath_fmr *fmr = to_ifmr(ibfmr);
354 struct ipath_lkey_table *rkt;
360 if (list_len > fmr->mr.max_segs) {
364 rkt = &to_idev(ibfmr->device)->lk_table;
365 spin_lock_irqsave(&rkt->lock, flags);
366 fmr->mr.user_base = iova;
368 ps = 1 << fmr->page_shift;
369 fmr->mr.length = list_len * ps;
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) {
381 spin_unlock_irqrestore(&rkt->lock, flags);
389 * ipath_unmap_fmr - unmap fast memory regions
390 * @fmr_list: the list of fast memory regions to unmap
392 * Returns 0 on success.
394 int ipath_unmap_fmr(struct list_head *fmr_list)
396 struct ipath_fmr *fmr;
397 struct ipath_lkey_table *rkt;
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;
406 spin_unlock_irqrestore(&rkt->lock, flags);
412 * ipath_dealloc_fmr - deallocate a fast memory region
413 * @ibfmr: the fast memory region to deallocate
415 * Returns 0 on success.
417 int ipath_dealloc_fmr(struct ib_fmr *ibfmr)
419 struct ipath_fmr *fmr = to_ifmr(ibfmr);
422 ipath_free_lkey(&to_idev(ibfmr->device)->lk_table, ibfmr->lkey);
425 kfree(fmr->mr.map[--i]);