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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - drivers/staging/rdma/ipath/ipath_mr.c
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
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 <linux/slab.h>
36 #include <rdma/ib_umem.h>
37 #include <rdma/ib_pack.h>
38 #include <rdma/ib_smi.h>
40 #include "ipath_verbs.h"
42 /* Fast memory region */
46 struct ipath_mregion mr
; /* must be last */
49 static inline struct ipath_fmr
*to_ifmr(struct ib_fmr
*ibfmr
)
51 return container_of(ibfmr
, struct ipath_fmr
, ibfmr
);
55 * ipath_get_dma_mr - get a DMA memory region
56 * @pd: protection domain for this memory region
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).
63 struct ib_mr
*ipath_get_dma_mr(struct ib_pd
*pd
, int acc
)
68 mr
= kzalloc(sizeof *mr
, GFP_KERNEL
);
70 ret
= ERR_PTR(-ENOMEM
);
74 mr
->mr
.access_flags
= acc
;
81 static struct ipath_mr
*alloc_mr(int count
,
82 struct ipath_lkey_table
*lk_table
)
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
);
93 /* Allocate first level page tables. */
95 mr
->mr
.map
[i
] = kmalloc(sizeof *mr
->mr
.map
[0], GFP_KERNEL
);
101 if (!ipath_alloc_lkey(lk_table
, &mr
->mr
))
103 mr
->ibmr
.rkey
= mr
->ibmr
.lkey
= mr
->mr
.lkey
;
110 kfree(mr
->mr
.map
[i
]);
120 * ipath_reg_user_mr - register a userspace memory region
121 * @pd: protection domain for this memory region
122 * @start: starting userspace address
123 * @length: length of region to register
124 * @virt_addr: virtual address to use (from HCA's point of view)
125 * @mr_access_flags: access flags for this memory region
126 * @udata: unused by the InfiniPath driver
128 * Returns the memory region on success, otherwise returns an errno.
130 struct ib_mr
*ipath_reg_user_mr(struct ib_pd
*pd
, u64 start
, u64 length
,
131 u64 virt_addr
, int mr_access_flags
,
132 struct ib_udata
*udata
)
135 struct ib_umem
*umem
;
137 struct scatterlist
*sg
;
141 ret
= ERR_PTR(-EINVAL
);
145 umem
= ib_umem_get(pd
->uobject
->context
, start
, length
,
148 return (void *) umem
;
151 mr
= alloc_mr(n
, &to_idev(pd
->device
)->lk_table
);
153 ret
= ERR_PTR(-ENOMEM
);
154 ib_umem_release(umem
);
159 mr
->mr
.user_base
= start
;
160 mr
->mr
.iova
= virt_addr
;
161 mr
->mr
.length
= length
;
162 mr
->mr
.offset
= ib_umem_offset(umem
);
163 mr
->mr
.access_flags
= mr_access_flags
;
169 for_each_sg(umem
->sg_head
.sgl
, sg
, umem
->nmap
, entry
) {
172 vaddr
= page_address(sg_page(sg
));
174 ret
= ERR_PTR(-EINVAL
);
177 mr
->mr
.map
[m
]->segs
[n
].vaddr
= vaddr
;
178 mr
->mr
.map
[m
]->segs
[n
].length
= umem
->page_size
;
180 if (n
== IPATH_SEGSZ
) {
192 * ipath_dereg_mr - unregister and free a memory region
193 * @ibmr: the memory region to free
195 * Returns 0 on success.
197 * Note that this is called to free MRs created by ipath_get_dma_mr()
198 * or ipath_reg_user_mr().
200 int ipath_dereg_mr(struct ib_mr
*ibmr
)
202 struct ipath_mr
*mr
= to_imr(ibmr
);
205 ipath_free_lkey(&to_idev(ibmr
->device
)->lk_table
, ibmr
->lkey
);
209 kfree(mr
->mr
.map
[i
]);
213 ib_umem_release(mr
->umem
);
220 * ipath_alloc_fmr - allocate a fast memory region
221 * @pd: the protection domain for this memory region
222 * @mr_access_flags: access flags for this memory region
223 * @fmr_attr: fast memory region attributes
225 * Returns the memory region on success, otherwise returns an errno.
227 struct ib_fmr
*ipath_alloc_fmr(struct ib_pd
*pd
, int mr_access_flags
,
228 struct ib_fmr_attr
*fmr_attr
)
230 struct ipath_fmr
*fmr
;
234 /* Allocate struct plus pointers to first level page tables. */
235 m
= (fmr_attr
->max_pages
+ IPATH_SEGSZ
- 1) / IPATH_SEGSZ
;
236 fmr
= kmalloc(sizeof *fmr
+ m
* sizeof fmr
->mr
.map
[0], GFP_KERNEL
);
240 /* Allocate first level page tables. */
242 fmr
->mr
.map
[i
] = kmalloc(sizeof *fmr
->mr
.map
[0],
250 * ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
253 if (!ipath_alloc_lkey(&to_idev(pd
->device
)->lk_table
, &fmr
->mr
))
255 fmr
->ibfmr
.rkey
= fmr
->ibfmr
.lkey
= fmr
->mr
.lkey
;
257 * Resources are allocated but no valid mapping (RKEY can't be
261 fmr
->mr
.user_base
= 0;
265 fmr
->mr
.access_flags
= mr_access_flags
;
266 fmr
->mr
.max_segs
= fmr_attr
->max_pages
;
267 fmr
->page_shift
= fmr_attr
->page_shift
;
274 kfree(fmr
->mr
.map
[--i
]);
276 ret
= ERR_PTR(-ENOMEM
);
283 * ipath_map_phys_fmr - set up a fast memory region
284 * @ibmfr: the fast memory region to set up
285 * @page_list: the list of pages to associate with the fast memory region
286 * @list_len: the number of pages to associate with the fast memory region
287 * @iova: the virtual address of the start of the fast memory region
289 * This may be called from interrupt context.
292 int ipath_map_phys_fmr(struct ib_fmr
*ibfmr
, u64
* page_list
,
293 int list_len
, u64 iova
)
295 struct ipath_fmr
*fmr
= to_ifmr(ibfmr
);
296 struct ipath_lkey_table
*rkt
;
302 if (list_len
> fmr
->mr
.max_segs
) {
306 rkt
= &to_idev(ibfmr
->device
)->lk_table
;
307 spin_lock_irqsave(&rkt
->lock
, flags
);
308 fmr
->mr
.user_base
= iova
;
310 ps
= 1 << fmr
->page_shift
;
311 fmr
->mr
.length
= list_len
* ps
;
314 ps
= 1 << fmr
->page_shift
;
315 for (i
= 0; i
< list_len
; i
++) {
316 fmr
->mr
.map
[m
]->segs
[n
].vaddr
= (void *) page_list
[i
];
317 fmr
->mr
.map
[m
]->segs
[n
].length
= ps
;
318 if (++n
== IPATH_SEGSZ
) {
323 spin_unlock_irqrestore(&rkt
->lock
, flags
);
331 * ipath_unmap_fmr - unmap fast memory regions
332 * @fmr_list: the list of fast memory regions to unmap
334 * Returns 0 on success.
336 int ipath_unmap_fmr(struct list_head
*fmr_list
)
338 struct ipath_fmr
*fmr
;
339 struct ipath_lkey_table
*rkt
;
342 list_for_each_entry(fmr
, fmr_list
, ibfmr
.list
) {
343 rkt
= &to_idev(fmr
->ibfmr
.device
)->lk_table
;
344 spin_lock_irqsave(&rkt
->lock
, flags
);
345 fmr
->mr
.user_base
= 0;
348 spin_unlock_irqrestore(&rkt
->lock
, flags
);
354 * ipath_dealloc_fmr - deallocate a fast memory region
355 * @ibfmr: the fast memory region to deallocate
357 * Returns 0 on success.
359 int ipath_dealloc_fmr(struct ib_fmr
*ibfmr
)
361 struct ipath_fmr
*fmr
= to_ifmr(ibfmr
);
364 ipath_free_lkey(&to_idev(ibfmr
->device
)->lk_table
, ibfmr
->lkey
);
367 kfree(fmr
->mr
.map
[--i
]);