Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[linux-2.6] / drivers / infiniband / hw / ehca / ehca_uverbs.c
1 /*
2  *  IBM eServer eHCA Infiniband device driver for Linux on POWER
3  *
4  *  userspace support verbs
5  *
6  *  Authors: Christoph Raisch <raisch@de.ibm.com>
7  *           Hoang-Nam Nguyen <hnguyen@de.ibm.com>
8  *           Heiko J Schick <schickhj@de.ibm.com>
9  *
10  *  Copyright (c) 2005 IBM Corporation
11  *
12  *  All rights reserved.
13  *
14  *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
15  *  BSD.
16  *
17  * OpenIB BSD License
18  *
19  * Redistribution and use in source and binary forms, with or without
20  * modification, are permitted provided that the following conditions are met:
21  *
22  * Redistributions of source code must retain the above copyright notice, this
23  * list of conditions and the following disclaimer.
24  *
25  * Redistributions in binary form must reproduce the above copyright notice,
26  * this list of conditions and the following disclaimer in the documentation
27  * and/or other materials
28  * provided with the distribution.
29  *
30  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
31  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
34  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
35  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
36  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
37  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
38  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
39  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
40  * POSSIBILITY OF SUCH DAMAGE.
41  */
42
43 #include "ehca_classes.h"
44 #include "ehca_iverbs.h"
45 #include "ehca_mrmw.h"
46 #include "ehca_tools.h"
47 #include "hcp_if.h"
48
49 struct ib_ucontext *ehca_alloc_ucontext(struct ib_device *device,
50                                         struct ib_udata *udata)
51 {
52         struct ehca_ucontext *my_context;
53
54         my_context = kzalloc(sizeof *my_context, GFP_KERNEL);
55         if (!my_context) {
56                 ehca_err(device, "Out of memory device=%p", device);
57                 return ERR_PTR(-ENOMEM);
58         }
59
60         return &my_context->ib_ucontext;
61 }
62
63 int ehca_dealloc_ucontext(struct ib_ucontext *context)
64 {
65         kfree(container_of(context, struct ehca_ucontext, ib_ucontext));
66         return 0;
67 }
68
69 static void ehca_mm_open(struct vm_area_struct *vma)
70 {
71         u32 *count = (u32 *)vma->vm_private_data;
72         if (!count) {
73                 ehca_gen_err("Invalid vma struct vm_start=%lx vm_end=%lx",
74                              vma->vm_start, vma->vm_end);
75                 return;
76         }
77         (*count)++;
78         if (!(*count))
79                 ehca_gen_err("Use count overflow vm_start=%lx vm_end=%lx",
80                              vma->vm_start, vma->vm_end);
81         ehca_gen_dbg("vm_start=%lx vm_end=%lx count=%x",
82                      vma->vm_start, vma->vm_end, *count);
83 }
84
85 static void ehca_mm_close(struct vm_area_struct *vma)
86 {
87         u32 *count = (u32 *)vma->vm_private_data;
88         if (!count) {
89                 ehca_gen_err("Invalid vma struct vm_start=%lx vm_end=%lx",
90                              vma->vm_start, vma->vm_end);
91                 return;
92         }
93         (*count)--;
94         ehca_gen_dbg("vm_start=%lx vm_end=%lx count=%x",
95                      vma->vm_start, vma->vm_end, *count);
96 }
97
98 static struct vm_operations_struct vm_ops = {
99         .open = ehca_mm_open,
100         .close = ehca_mm_close,
101 };
102
103 static int ehca_mmap_fw(struct vm_area_struct *vma, struct h_galpas *galpas,
104                         u32 *mm_count)
105 {
106         int ret;
107         u64 vsize, physical;
108
109         vsize = vma->vm_end - vma->vm_start;
110         if (vsize < EHCA_PAGESIZE) {
111                 ehca_gen_err("invalid vsize=%lx", vma->vm_end - vma->vm_start);
112                 return -EINVAL;
113         }
114
115         physical = galpas->user.fw_handle;
116         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
117         ehca_gen_dbg("vsize=%lx physical=%lx", vsize, physical);
118         /* VM_IO | VM_RESERVED are set by remap_pfn_range() */
119         ret = remap_4k_pfn(vma, vma->vm_start, physical >> EHCA_PAGESHIFT,
120                            vma->vm_page_prot);
121         if (unlikely(ret)) {
122                 ehca_gen_err("remap_pfn_range() failed ret=%i", ret);
123                 return -ENOMEM;
124         }
125
126         vma->vm_private_data = mm_count;
127         (*mm_count)++;
128         vma->vm_ops = &vm_ops;
129
130         return 0;
131 }
132
133 static int ehca_mmap_queue(struct vm_area_struct *vma, struct ipz_queue *queue,
134                            u32 *mm_count)
135 {
136         int ret;
137         u64 start, ofs;
138         struct page *page;
139
140         vma->vm_flags |= VM_RESERVED;
141         start = vma->vm_start;
142         for (ofs = 0; ofs < queue->queue_length; ofs += PAGE_SIZE) {
143                 u64 virt_addr = (u64)ipz_qeit_calc(queue, ofs);
144                 page = virt_to_page(virt_addr);
145                 ret = vm_insert_page(vma, start, page);
146                 if (unlikely(ret)) {
147                         ehca_gen_err("vm_insert_page() failed rc=%i", ret);
148                         return ret;
149                 }
150                 start += PAGE_SIZE;
151         }
152         vma->vm_private_data = mm_count;
153         (*mm_count)++;
154         vma->vm_ops = &vm_ops;
155
156         return 0;
157 }
158
159 static int ehca_mmap_cq(struct vm_area_struct *vma, struct ehca_cq *cq,
160                         u32 rsrc_type)
161 {
162         int ret;
163
164         switch (rsrc_type) {
165         case 0: /* galpa fw handle */
166                 ehca_dbg(cq->ib_cq.device, "cq_num=%x fw", cq->cq_number);
167                 ret = ehca_mmap_fw(vma, &cq->galpas, &cq->mm_count_galpa);
168                 if (unlikely(ret)) {
169                         ehca_err(cq->ib_cq.device,
170                                  "ehca_mmap_fw() failed rc=%i cq_num=%x",
171                                  ret, cq->cq_number);
172                         return ret;
173                 }
174                 break;
175
176         case 1: /* cq queue_addr */
177                 ehca_dbg(cq->ib_cq.device, "cq_num=%x queue", cq->cq_number);
178                 ret = ehca_mmap_queue(vma, &cq->ipz_queue, &cq->mm_count_queue);
179                 if (unlikely(ret)) {
180                         ehca_err(cq->ib_cq.device,
181                                  "ehca_mmap_queue() failed rc=%i cq_num=%x",
182                                  ret, cq->cq_number);
183                         return ret;
184                 }
185                 break;
186
187         default:
188                 ehca_err(cq->ib_cq.device, "bad resource type=%x cq_num=%x",
189                          rsrc_type, cq->cq_number);
190                 return -EINVAL;
191         }
192
193         return 0;
194 }
195
196 static int ehca_mmap_qp(struct vm_area_struct *vma, struct ehca_qp *qp,
197                         u32 rsrc_type)
198 {
199         int ret;
200
201         switch (rsrc_type) {
202         case 0: /* galpa fw handle */
203                 ehca_dbg(qp->ib_qp.device, "qp_num=%x fw", qp->ib_qp.qp_num);
204                 ret = ehca_mmap_fw(vma, &qp->galpas, &qp->mm_count_galpa);
205                 if (unlikely(ret)) {
206                         ehca_err(qp->ib_qp.device,
207                                  "remap_pfn_range() failed ret=%i qp_num=%x",
208                                  ret, qp->ib_qp.qp_num);
209                         return -ENOMEM;
210                 }
211                 break;
212
213         case 1: /* qp rqueue_addr */
214                 ehca_dbg(qp->ib_qp.device, "qp_num=%x rq", qp->ib_qp.qp_num);
215                 ret = ehca_mmap_queue(vma, &qp->ipz_rqueue,
216                                       &qp->mm_count_rqueue);
217                 if (unlikely(ret)) {
218                         ehca_err(qp->ib_qp.device,
219                                  "ehca_mmap_queue(rq) failed rc=%i qp_num=%x",
220                                  ret, qp->ib_qp.qp_num);
221                         return ret;
222                 }
223                 break;
224
225         case 2: /* qp squeue_addr */
226                 ehca_dbg(qp->ib_qp.device, "qp_num=%x sq", qp->ib_qp.qp_num);
227                 ret = ehca_mmap_queue(vma, &qp->ipz_squeue,
228                                       &qp->mm_count_squeue);
229                 if (unlikely(ret)) {
230                         ehca_err(qp->ib_qp.device,
231                                  "ehca_mmap_queue(sq) failed rc=%i qp_num=%x",
232                                  ret, qp->ib_qp.qp_num);
233                         return ret;
234                 }
235                 break;
236
237         default:
238                 ehca_err(qp->ib_qp.device, "bad resource type=%x qp=num=%x",
239                          rsrc_type, qp->ib_qp.qp_num);
240                 return -EINVAL;
241         }
242
243         return 0;
244 }
245
246 int ehca_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
247 {
248         u64 fileoffset = vma->vm_pgoff;
249         u32 idr_handle = fileoffset & 0x1FFFFFF;
250         u32 q_type = (fileoffset >> 27) & 0x1;    /* CQ, QP,...        */
251         u32 rsrc_type = (fileoffset >> 25) & 0x3; /* sq,rq,cmnd_window */
252         u32 ret;
253         struct ehca_cq *cq;
254         struct ehca_qp *qp;
255         struct ib_uobject *uobject;
256
257         switch (q_type) {
258         case  0: /* CQ */
259                 read_lock(&ehca_cq_idr_lock);
260                 cq = idr_find(&ehca_cq_idr, idr_handle);
261                 read_unlock(&ehca_cq_idr_lock);
262
263                 /* make sure this mmap really belongs to the authorized user */
264                 if (!cq)
265                         return -EINVAL;
266
267                 if (!cq->ib_cq.uobject || cq->ib_cq.uobject->context != context)
268                         return -EINVAL;
269
270                 ret = ehca_mmap_cq(vma, cq, rsrc_type);
271                 if (unlikely(ret)) {
272                         ehca_err(cq->ib_cq.device,
273                                  "ehca_mmap_cq() failed rc=%i cq_num=%x",
274                                  ret, cq->cq_number);
275                         return ret;
276                 }
277                 break;
278
279         case 1: /* QP */
280                 read_lock(&ehca_qp_idr_lock);
281                 qp = idr_find(&ehca_qp_idr, idr_handle);
282                 read_unlock(&ehca_qp_idr_lock);
283
284                 /* make sure this mmap really belongs to the authorized user */
285                 if (!qp)
286                         return -EINVAL;
287
288                 uobject = IS_SRQ(qp) ? qp->ib_srq.uobject : qp->ib_qp.uobject;
289                 if (!uobject || uobject->context != context)
290                         return -EINVAL;
291
292                 ret = ehca_mmap_qp(vma, qp, rsrc_type);
293                 if (unlikely(ret)) {
294                         ehca_err(qp->ib_qp.device,
295                                  "ehca_mmap_qp() failed rc=%i qp_num=%x",
296                                  ret, qp->ib_qp.qp_num);
297                         return ret;
298                 }
299                 break;
300
301         default:
302                 ehca_gen_err("bad queue type %x", q_type);
303                 return -EINVAL;
304         }
305
306         return 0;
307 }