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bc38a6ab RD |
1 | /* |
2 | * Copyright (c) 2005 Topspin Communications. All rights reserved. | |
33b9b3ee | 3 | * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. |
2a1d9b7f RD |
4 | * Copyright (c) 2005 Mellanox Technologies. All rights reserved. |
5 | * Copyright (c) 2005 Voltaire, Inc. All rights reserved. | |
67cdb40c | 6 | * Copyright (c) 2005 PathScale, Inc. All rights reserved. |
bc38a6ab RD |
7 | * |
8 | * This software is available to you under a choice of one of two | |
9 | * licenses. You may choose to be licensed under the terms of the GNU | |
10 | * General Public License (GPL) Version 2, available from the file | |
11 | * COPYING in the main directory of this source tree, or the | |
12 | * OpenIB.org BSD license below: | |
13 | * | |
14 | * Redistribution and use in source and binary forms, with or | |
15 | * without modification, are permitted provided that the following | |
16 | * conditions are met: | |
17 | * | |
18 | * - Redistributions of source code must retain the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer. | |
21 | * | |
22 | * - Redistributions in binary form must reproduce the above | |
23 | * copyright notice, this list of conditions and the following | |
24 | * disclaimer in the documentation and/or other materials | |
25 | * provided with the distribution. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
28 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
29 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
30 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
31 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
32 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
33 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
34 | * SOFTWARE. | |
bc38a6ab RD |
35 | */ |
36 | ||
37 | #include <linux/module.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/device.h> | |
40 | #include <linux/err.h> | |
41 | #include <linux/fs.h> | |
42 | #include <linux/poll.h> | |
a99bbaf5 | 43 | #include <linux/sched.h> |
bc38a6ab | 44 | #include <linux/file.h> |
70a30e16 | 45 | #include <linux/cdev.h> |
a265e558 | 46 | #include <linux/anon_inodes.h> |
5a0e3ad6 | 47 | #include <linux/slab.h> |
bc38a6ab RD |
48 | |
49 | #include <asm/uaccess.h> | |
50 | ||
51 | #include "uverbs.h" | |
52 | ||
53 | MODULE_AUTHOR("Roland Dreier"); | |
54 | MODULE_DESCRIPTION("InfiniBand userspace verbs access"); | |
55 | MODULE_LICENSE("Dual BSD/GPL"); | |
56 | ||
bc38a6ab RD |
57 | enum { |
58 | IB_UVERBS_MAJOR = 231, | |
59 | IB_UVERBS_BASE_MINOR = 192, | |
60 | IB_UVERBS_MAX_DEVICES = 32 | |
61 | }; | |
62 | ||
63 | #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR) | |
64 | ||
70a30e16 RD |
65 | static struct class *uverbs_class; |
66 | ||
9ead190b | 67 | DEFINE_SPINLOCK(ib_uverbs_idr_lock); |
bc38a6ab RD |
68 | DEFINE_IDR(ib_uverbs_pd_idr); |
69 | DEFINE_IDR(ib_uverbs_mr_idr); | |
70 | DEFINE_IDR(ib_uverbs_mw_idr); | |
71 | DEFINE_IDR(ib_uverbs_ah_idr); | |
72 | DEFINE_IDR(ib_uverbs_cq_idr); | |
73 | DEFINE_IDR(ib_uverbs_qp_idr); | |
f520ba5a | 74 | DEFINE_IDR(ib_uverbs_srq_idr); |
53d0bd1e | 75 | DEFINE_IDR(ib_uverbs_xrcd_idr); |
436f2ad0 | 76 | DEFINE_IDR(ib_uverbs_rule_idr); |
bc38a6ab | 77 | |
6276e08a | 78 | static DEFINE_SPINLOCK(map_lock); |
bc38a6ab RD |
79 | static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); |
80 | ||
81 | static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, | |
057aec0d | 82 | struct ib_device *ib_dev, |
bc38a6ab RD |
83 | const char __user *buf, int in_len, |
84 | int out_len) = { | |
9afed76d AC |
85 | [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, |
86 | [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, | |
87 | [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, | |
88 | [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, | |
89 | [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, | |
90 | [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, | |
7e6edb9b | 91 | [IB_USER_VERBS_CMD_REREG_MR] = ib_uverbs_rereg_mr, |
9afed76d | 92 | [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, |
6b52a12b SM |
93 | [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw, |
94 | [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw, | |
6b73597e | 95 | [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, |
9afed76d AC |
96 | [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, |
97 | [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq, | |
98 | [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, | |
99 | [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, | |
100 | [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, | |
101 | [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, | |
102 | [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp, | |
103 | [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, | |
104 | [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, | |
105 | [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, | |
106 | [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, | |
107 | [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, | |
108 | [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, | |
109 | [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, | |
110 | [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, | |
111 | [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, | |
112 | [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, | |
113 | [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, | |
114 | [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq, | |
115 | [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, | |
53d0bd1e SH |
116 | [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd, |
117 | [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd, | |
42849b26 | 118 | [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq, |
436f2ad0 | 119 | [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp, |
f21519b2 YD |
120 | }; |
121 | ||
f21519b2 | 122 | static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file, |
057aec0d | 123 | struct ib_device *ib_dev, |
f21519b2 YD |
124 | struct ib_udata *ucore, |
125 | struct ib_udata *uhw) = { | |
126 | [IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow, | |
5a77abf9 | 127 | [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow, |
02d1aa7a | 128 | [IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device, |
565197dd | 129 | [IB_USER_VERBS_EX_CMD_CREATE_CQ] = ib_uverbs_ex_create_cq, |
6d8a7497 | 130 | [IB_USER_VERBS_EX_CMD_CREATE_QP] = ib_uverbs_ex_create_qp, |
bc38a6ab RD |
131 | }; |
132 | ||
bc38a6ab | 133 | static void ib_uverbs_add_one(struct ib_device *device); |
7c1eb45a | 134 | static void ib_uverbs_remove_one(struct ib_device *device, void *client_data); |
bc38a6ab | 135 | |
feb7c1e3 CH |
136 | int uverbs_dealloc_mw(struct ib_mw *mw) |
137 | { | |
138 | struct ib_pd *pd = mw->pd; | |
139 | int ret; | |
140 | ||
141 | ret = mw->device->dealloc_mw(mw); | |
142 | if (!ret) | |
143 | atomic_dec(&pd->usecnt); | |
144 | return ret; | |
145 | } | |
146 | ||
35d4a0b6 | 147 | static void ib_uverbs_release_dev(struct kobject *kobj) |
70a30e16 RD |
148 | { |
149 | struct ib_uverbs_device *dev = | |
35d4a0b6 | 150 | container_of(kobj, struct ib_uverbs_device, kobj); |
70a30e16 | 151 | |
036b1063 | 152 | cleanup_srcu_struct(&dev->disassociate_srcu); |
35d4a0b6 | 153 | kfree(dev); |
70a30e16 RD |
154 | } |
155 | ||
35d4a0b6 YH |
156 | static struct kobj_type ib_uverbs_dev_ktype = { |
157 | .release = ib_uverbs_release_dev, | |
158 | }; | |
159 | ||
04d29b0e RD |
160 | static void ib_uverbs_release_event_file(struct kref *ref) |
161 | { | |
162 | struct ib_uverbs_event_file *file = | |
163 | container_of(ref, struct ib_uverbs_event_file, ref); | |
164 | ||
165 | kfree(file); | |
166 | } | |
167 | ||
70a30e16 RD |
168 | void ib_uverbs_release_ucq(struct ib_uverbs_file *file, |
169 | struct ib_uverbs_event_file *ev_file, | |
170 | struct ib_ucq_object *uobj) | |
171 | { | |
172 | struct ib_uverbs_event *evt, *tmp; | |
173 | ||
174 | if (ev_file) { | |
175 | spin_lock_irq(&ev_file->lock); | |
176 | list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { | |
177 | list_del(&evt->list); | |
178 | kfree(evt); | |
179 | } | |
180 | spin_unlock_irq(&ev_file->lock); | |
181 | ||
182 | kref_put(&ev_file->ref, ib_uverbs_release_event_file); | |
183 | } | |
184 | ||
185 | spin_lock_irq(&file->async_file->lock); | |
186 | list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { | |
187 | list_del(&evt->list); | |
188 | kfree(evt); | |
189 | } | |
190 | spin_unlock_irq(&file->async_file->lock); | |
191 | } | |
192 | ||
193 | void ib_uverbs_release_uevent(struct ib_uverbs_file *file, | |
194 | struct ib_uevent_object *uobj) | |
195 | { | |
196 | struct ib_uverbs_event *evt, *tmp; | |
197 | ||
198 | spin_lock_irq(&file->async_file->lock); | |
199 | list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { | |
200 | list_del(&evt->list); | |
201 | kfree(evt); | |
202 | } | |
203 | spin_unlock_irq(&file->async_file->lock); | |
204 | } | |
205 | ||
f4e40156 JM |
206 | static void ib_uverbs_detach_umcast(struct ib_qp *qp, |
207 | struct ib_uqp_object *uobj) | |
208 | { | |
209 | struct ib_uverbs_mcast_entry *mcast, *tmp; | |
210 | ||
211 | list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { | |
212 | ib_detach_mcast(qp, &mcast->gid, mcast->lid); | |
213 | list_del(&mcast->list); | |
214 | kfree(mcast); | |
215 | } | |
216 | } | |
217 | ||
70a30e16 RD |
218 | static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, |
219 | struct ib_ucontext *context) | |
bc38a6ab RD |
220 | { |
221 | struct ib_uobject *uobj, *tmp; | |
222 | ||
f7c6a7b5 RD |
223 | context->closing = 1; |
224 | ||
67cdb40c | 225 | list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { |
9ead190b RD |
226 | struct ib_ah *ah = uobj->object; |
227 | ||
228 | idr_remove_uobj(&ib_uverbs_ah_idr, uobj); | |
67cdb40c | 229 | ib_destroy_ah(ah); |
67cdb40c RD |
230 | kfree(uobj); |
231 | } | |
bc38a6ab | 232 | |
6b52a12b SM |
233 | /* Remove MWs before QPs, in order to support type 2A MWs. */ |
234 | list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) { | |
235 | struct ib_mw *mw = uobj->object; | |
236 | ||
237 | idr_remove_uobj(&ib_uverbs_mw_idr, uobj); | |
feb7c1e3 | 238 | uverbs_dealloc_mw(mw); |
6b52a12b SM |
239 | kfree(uobj); |
240 | } | |
241 | ||
436f2ad0 HHZ |
242 | list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) { |
243 | struct ib_flow *flow_id = uobj->object; | |
244 | ||
245 | idr_remove_uobj(&ib_uverbs_rule_idr, uobj); | |
246 | ib_destroy_flow(flow_id); | |
247 | kfree(uobj); | |
248 | } | |
249 | ||
bc38a6ab | 250 | list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { |
9ead190b | 251 | struct ib_qp *qp = uobj->object; |
f4e40156 JM |
252 | struct ib_uqp_object *uqp = |
253 | container_of(uobj, struct ib_uqp_object, uevent.uobject); | |
9ead190b RD |
254 | |
255 | idr_remove_uobj(&ib_uverbs_qp_idr, uobj); | |
0e0ec7e0 SH |
256 | if (qp != qp->real_qp) { |
257 | ib_close_qp(qp); | |
b93f3c18 SH |
258 | } else { |
259 | ib_uverbs_detach_umcast(qp, uqp); | |
260 | ib_destroy_qp(qp); | |
261 | } | |
f4e40156 JM |
262 | ib_uverbs_release_uevent(file, &uqp->uevent); |
263 | kfree(uqp); | |
bc38a6ab RD |
264 | } |
265 | ||
a233c4b5 SD |
266 | list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { |
267 | struct ib_srq *srq = uobj->object; | |
268 | struct ib_uevent_object *uevent = | |
269 | container_of(uobj, struct ib_uevent_object, uobject); | |
270 | ||
271 | idr_remove_uobj(&ib_uverbs_srq_idr, uobj); | |
272 | ib_destroy_srq(srq); | |
273 | ib_uverbs_release_uevent(file, uevent); | |
274 | kfree(uevent); | |
275 | } | |
276 | ||
bc38a6ab | 277 | list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { |
9ead190b | 278 | struct ib_cq *cq = uobj->object; |
70a30e16 RD |
279 | struct ib_uverbs_event_file *ev_file = cq->cq_context; |
280 | struct ib_ucq_object *ucq = | |
281 | container_of(uobj, struct ib_ucq_object, uobject); | |
9ead190b RD |
282 | |
283 | idr_remove_uobj(&ib_uverbs_cq_idr, uobj); | |
bc38a6ab | 284 | ib_destroy_cq(cq); |
70a30e16 RD |
285 | ib_uverbs_release_ucq(file, ev_file, ucq); |
286 | kfree(ucq); | |
bc38a6ab RD |
287 | } |
288 | ||
bc38a6ab | 289 | list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { |
9ead190b | 290 | struct ib_mr *mr = uobj->object; |
bc38a6ab | 291 | |
9ead190b | 292 | idr_remove_uobj(&ib_uverbs_mr_idr, uobj); |
bc38a6ab | 293 | ib_dereg_mr(mr); |
f7c6a7b5 | 294 | kfree(uobj); |
bc38a6ab RD |
295 | } |
296 | ||
53d0bd1e SH |
297 | mutex_lock(&file->device->xrcd_tree_mutex); |
298 | list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) { | |
299 | struct ib_xrcd *xrcd = uobj->object; | |
300 | struct ib_uxrcd_object *uxrcd = | |
301 | container_of(uobj, struct ib_uxrcd_object, uobject); | |
302 | ||
303 | idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj); | |
304 | ib_uverbs_dealloc_xrcd(file->device, xrcd); | |
305 | kfree(uxrcd); | |
306 | } | |
307 | mutex_unlock(&file->device->xrcd_tree_mutex); | |
308 | ||
bc38a6ab | 309 | list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { |
9ead190b RD |
310 | struct ib_pd *pd = uobj->object; |
311 | ||
312 | idr_remove_uobj(&ib_uverbs_pd_idr, uobj); | |
bc38a6ab | 313 | ib_dealloc_pd(pd); |
bc38a6ab RD |
314 | kfree(uobj); |
315 | } | |
316 | ||
8ada2c1c SR |
317 | put_pid(context->tgid); |
318 | ||
bc38a6ab RD |
319 | return context->device->dealloc_ucontext(context); |
320 | } | |
321 | ||
35d4a0b6 YH |
322 | static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev) |
323 | { | |
324 | complete(&dev->comp); | |
325 | } | |
326 | ||
bc38a6ab RD |
327 | static void ib_uverbs_release_file(struct kref *ref) |
328 | { | |
329 | struct ib_uverbs_file *file = | |
330 | container_of(ref, struct ib_uverbs_file, ref); | |
036b1063 YH |
331 | struct ib_device *ib_dev; |
332 | int srcu_key; | |
333 | ||
334 | srcu_key = srcu_read_lock(&file->device->disassociate_srcu); | |
335 | ib_dev = srcu_dereference(file->device->ib_dev, | |
336 | &file->device->disassociate_srcu); | |
337 | if (ib_dev && !ib_dev->disassociate_ucontext) | |
338 | module_put(ib_dev->owner); | |
339 | srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); | |
bc38a6ab | 340 | |
35d4a0b6 YH |
341 | if (atomic_dec_and_test(&file->device->refcount)) |
342 | ib_uverbs_comp_dev(file->device); | |
70a30e16 | 343 | |
bc38a6ab RD |
344 | kfree(file); |
345 | } | |
346 | ||
347 | static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, | |
348 | size_t count, loff_t *pos) | |
349 | { | |
350 | struct ib_uverbs_event_file *file = filp->private_data; | |
63aaf647 | 351 | struct ib_uverbs_event *event; |
bc38a6ab RD |
352 | int eventsz; |
353 | int ret = 0; | |
354 | ||
355 | spin_lock_irq(&file->lock); | |
356 | ||
6b73597e | 357 | while (list_empty(&file->event_list)) { |
bc38a6ab RD |
358 | spin_unlock_irq(&file->lock); |
359 | ||
360 | if (filp->f_flags & O_NONBLOCK) | |
361 | return -EAGAIN; | |
362 | ||
363 | if (wait_event_interruptible(file->poll_wait, | |
036b1063 YH |
364 | (!list_empty(&file->event_list) || |
365 | /* The barriers built into wait_event_interruptible() | |
366 | * and wake_up() guarentee this will see the null set | |
367 | * without using RCU | |
368 | */ | |
369 | !file->uverbs_file->device->ib_dev))) | |
bc38a6ab RD |
370 | return -ERESTARTSYS; |
371 | ||
036b1063 YH |
372 | /* If device was disassociated and no event exists set an error */ |
373 | if (list_empty(&file->event_list) && | |
374 | !file->uverbs_file->device->ib_dev) | |
375 | return -EIO; | |
376 | ||
bc38a6ab RD |
377 | spin_lock_irq(&file->lock); |
378 | } | |
379 | ||
63aaf647 RD |
380 | event = list_entry(file->event_list.next, struct ib_uverbs_event, list); |
381 | ||
382 | if (file->is_async) | |
bc38a6ab | 383 | eventsz = sizeof (struct ib_uverbs_async_event_desc); |
63aaf647 | 384 | else |
bc38a6ab | 385 | eventsz = sizeof (struct ib_uverbs_comp_event_desc); |
bc38a6ab RD |
386 | |
387 | if (eventsz > count) { | |
388 | ret = -EINVAL; | |
389 | event = NULL; | |
63aaf647 | 390 | } else { |
bc38a6ab | 391 | list_del(file->event_list.next); |
63aaf647 RD |
392 | if (event->counter) { |
393 | ++(*event->counter); | |
394 | list_del(&event->obj_list); | |
395 | } | |
396 | } | |
bc38a6ab RD |
397 | |
398 | spin_unlock_irq(&file->lock); | |
399 | ||
400 | if (event) { | |
401 | if (copy_to_user(buf, event, eventsz)) | |
402 | ret = -EFAULT; | |
403 | else | |
404 | ret = eventsz; | |
405 | } | |
406 | ||
407 | kfree(event); | |
408 | ||
409 | return ret; | |
410 | } | |
411 | ||
412 | static unsigned int ib_uverbs_event_poll(struct file *filp, | |
413 | struct poll_table_struct *wait) | |
414 | { | |
415 | unsigned int pollflags = 0; | |
416 | struct ib_uverbs_event_file *file = filp->private_data; | |
417 | ||
418 | poll_wait(filp, &file->poll_wait, wait); | |
419 | ||
420 | spin_lock_irq(&file->lock); | |
6b73597e | 421 | if (!list_empty(&file->event_list)) |
bc38a6ab RD |
422 | pollflags = POLLIN | POLLRDNORM; |
423 | spin_unlock_irq(&file->lock); | |
424 | ||
425 | return pollflags; | |
426 | } | |
427 | ||
abdf119b GN |
428 | static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) |
429 | { | |
430 | struct ib_uverbs_event_file *file = filp->private_data; | |
431 | ||
432 | return fasync_helper(fd, filp, on, &file->async_queue); | |
433 | } | |
434 | ||
bc38a6ab RD |
435 | static int ib_uverbs_event_close(struct inode *inode, struct file *filp) |
436 | { | |
437 | struct ib_uverbs_event_file *file = filp->private_data; | |
6b73597e | 438 | struct ib_uverbs_event *entry, *tmp; |
036b1063 | 439 | int closed_already = 0; |
6b73597e | 440 | |
036b1063 | 441 | mutex_lock(&file->uverbs_file->device->lists_mutex); |
6b73597e | 442 | spin_lock_irq(&file->lock); |
036b1063 | 443 | closed_already = file->is_closed; |
1ae5c187 | 444 | file->is_closed = 1; |
6b73597e RD |
445 | list_for_each_entry_safe(entry, tmp, &file->event_list, list) { |
446 | if (entry->counter) | |
447 | list_del(&entry->obj_list); | |
448 | kfree(entry); | |
449 | } | |
450 | spin_unlock_irq(&file->lock); | |
036b1063 YH |
451 | if (!closed_already) { |
452 | list_del(&file->list); | |
453 | if (file->is_async) | |
454 | ib_unregister_event_handler(&file->uverbs_file-> | |
455 | event_handler); | |
456 | } | |
457 | mutex_unlock(&file->uverbs_file->device->lists_mutex); | |
bc38a6ab | 458 | |
03c40442 | 459 | kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); |
6b73597e | 460 | kref_put(&file->ref, ib_uverbs_release_event_file); |
bc38a6ab RD |
461 | |
462 | return 0; | |
463 | } | |
464 | ||
2b8693c0 | 465 | static const struct file_operations uverbs_event_fops = { |
6b73597e | 466 | .owner = THIS_MODULE, |
9afed76d | 467 | .read = ib_uverbs_event_read, |
bc38a6ab | 468 | .poll = ib_uverbs_event_poll, |
abdf119b | 469 | .release = ib_uverbs_event_close, |
bc1db9af RD |
470 | .fasync = ib_uverbs_event_fasync, |
471 | .llseek = no_llseek, | |
bc38a6ab RD |
472 | }; |
473 | ||
474 | void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) | |
475 | { | |
6b73597e RD |
476 | struct ib_uverbs_event_file *file = cq_context; |
477 | struct ib_ucq_object *uobj; | |
478 | struct ib_uverbs_event *entry; | |
479 | unsigned long flags; | |
480 | ||
481 | if (!file) | |
482 | return; | |
483 | ||
484 | spin_lock_irqsave(&file->lock, flags); | |
1ae5c187 | 485 | if (file->is_closed) { |
6b73597e RD |
486 | spin_unlock_irqrestore(&file->lock, flags); |
487 | return; | |
488 | } | |
bc38a6ab RD |
489 | |
490 | entry = kmalloc(sizeof *entry, GFP_ATOMIC); | |
305a7e87 RD |
491 | if (!entry) { |
492 | spin_unlock_irqrestore(&file->lock, flags); | |
bc38a6ab | 493 | return; |
305a7e87 | 494 | } |
bc38a6ab | 495 | |
63aaf647 RD |
496 | uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); |
497 | ||
498 | entry->desc.comp.cq_handle = cq->uobject->user_handle; | |
499 | entry->counter = &uobj->comp_events_reported; | |
bc38a6ab | 500 | |
6b73597e | 501 | list_add_tail(&entry->list, &file->event_list); |
63aaf647 | 502 | list_add_tail(&entry->obj_list, &uobj->comp_list); |
6b73597e | 503 | spin_unlock_irqrestore(&file->lock, flags); |
bc38a6ab | 504 | |
6b73597e RD |
505 | wake_up_interruptible(&file->poll_wait); |
506 | kill_fasync(&file->async_queue, SIGIO, POLL_IN); | |
bc38a6ab RD |
507 | } |
508 | ||
509 | static void ib_uverbs_async_handler(struct ib_uverbs_file *file, | |
63aaf647 RD |
510 | __u64 element, __u64 event, |
511 | struct list_head *obj_list, | |
512 | u32 *counter) | |
bc38a6ab | 513 | { |
63aaf647 | 514 | struct ib_uverbs_event *entry; |
bc38a6ab RD |
515 | unsigned long flags; |
516 | ||
6b73597e | 517 | spin_lock_irqsave(&file->async_file->lock, flags); |
fb77bcef | 518 | if (file->async_file->is_closed) { |
6b73597e RD |
519 | spin_unlock_irqrestore(&file->async_file->lock, flags); |
520 | return; | |
521 | } | |
522 | ||
bc38a6ab | 523 | entry = kmalloc(sizeof *entry, GFP_ATOMIC); |
305a7e87 RD |
524 | if (!entry) { |
525 | spin_unlock_irqrestore(&file->async_file->lock, flags); | |
bc38a6ab | 526 | return; |
305a7e87 | 527 | } |
bc38a6ab | 528 | |
63aaf647 RD |
529 | entry->desc.async.element = element; |
530 | entry->desc.async.event_type = event; | |
377b5134 | 531 | entry->desc.async.reserved = 0; |
63aaf647 | 532 | entry->counter = counter; |
bc38a6ab | 533 | |
6b73597e | 534 | list_add_tail(&entry->list, &file->async_file->event_list); |
63aaf647 RD |
535 | if (obj_list) |
536 | list_add_tail(&entry->obj_list, obj_list); | |
6b73597e | 537 | spin_unlock_irqrestore(&file->async_file->lock, flags); |
bc38a6ab | 538 | |
6b73597e RD |
539 | wake_up_interruptible(&file->async_file->poll_wait); |
540 | kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); | |
bc38a6ab RD |
541 | } |
542 | ||
543 | void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) | |
544 | { | |
7162a3e0 RD |
545 | struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, |
546 | struct ib_ucq_object, uobject); | |
63aaf647 | 547 | |
7162a3e0 | 548 | ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, |
63aaf647 RD |
549 | event->event, &uobj->async_list, |
550 | &uobj->async_events_reported); | |
bc38a6ab RD |
551 | } |
552 | ||
553 | void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) | |
554 | { | |
63aaf647 RD |
555 | struct ib_uevent_object *uobj; |
556 | ||
a040f95d JM |
557 | /* for XRC target qp's, check that qp is live */ |
558 | if (!event->element.qp->uobject || !event->element.qp->uobject->live) | |
559 | return; | |
560 | ||
63aaf647 RD |
561 | uobj = container_of(event->element.qp->uobject, |
562 | struct ib_uevent_object, uobject); | |
563 | ||
564 | ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, | |
565 | event->event, &uobj->event_list, | |
566 | &uobj->events_reported); | |
bc38a6ab RD |
567 | } |
568 | ||
f520ba5a RD |
569 | void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) |
570 | { | |
63aaf647 RD |
571 | struct ib_uevent_object *uobj; |
572 | ||
573 | uobj = container_of(event->element.srq->uobject, | |
574 | struct ib_uevent_object, uobject); | |
575 | ||
576 | ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, | |
577 | event->event, &uobj->event_list, | |
578 | &uobj->events_reported); | |
f520ba5a RD |
579 | } |
580 | ||
6b73597e RD |
581 | void ib_uverbs_event_handler(struct ib_event_handler *handler, |
582 | struct ib_event *event) | |
bc38a6ab RD |
583 | { |
584 | struct ib_uverbs_file *file = | |
585 | container_of(handler, struct ib_uverbs_file, event_handler); | |
586 | ||
63aaf647 RD |
587 | ib_uverbs_async_handler(file, event->element.port_num, event->event, |
588 | NULL, NULL); | |
bc38a6ab RD |
589 | } |
590 | ||
03c40442 YH |
591 | void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file) |
592 | { | |
593 | kref_put(&file->async_file->ref, ib_uverbs_release_event_file); | |
594 | file->async_file = NULL; | |
595 | } | |
596 | ||
6b73597e | 597 | struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, |
057aec0d | 598 | struct ib_device *ib_dev, |
b1e4594b | 599 | int is_async) |
bc38a6ab | 600 | { |
6b73597e | 601 | struct ib_uverbs_event_file *ev_file; |
bc38a6ab | 602 | struct file *filp; |
03c40442 | 603 | int ret; |
bc38a6ab | 604 | |
03c40442 | 605 | ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL); |
6b73597e RD |
606 | if (!ev_file) |
607 | return ERR_PTR(-ENOMEM); | |
608 | ||
609 | kref_init(&ev_file->ref); | |
610 | spin_lock_init(&ev_file->lock); | |
611 | INIT_LIST_HEAD(&ev_file->event_list); | |
612 | init_waitqueue_head(&ev_file->poll_wait); | |
613 | ev_file->uverbs_file = uverbs_file; | |
03c40442 | 614 | kref_get(&ev_file->uverbs_file->ref); |
6b73597e | 615 | ev_file->async_queue = NULL; |
1ae5c187 | 616 | ev_file->is_closed = 0; |
6b73597e | 617 | |
b1e4594b | 618 | filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops, |
a265e558 | 619 | ev_file, O_RDONLY); |
b1e4594b | 620 | if (IS_ERR(filp)) |
03c40442 YH |
621 | goto err_put_refs; |
622 | ||
036b1063 YH |
623 | mutex_lock(&uverbs_file->device->lists_mutex); |
624 | list_add_tail(&ev_file->list, | |
625 | &uverbs_file->device->uverbs_events_file_list); | |
626 | mutex_unlock(&uverbs_file->device->lists_mutex); | |
627 | ||
03c40442 YH |
628 | if (is_async) { |
629 | WARN_ON(uverbs_file->async_file); | |
630 | uverbs_file->async_file = ev_file; | |
631 | kref_get(&uverbs_file->async_file->ref); | |
632 | INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler, | |
057aec0d | 633 | ib_dev, |
03c40442 YH |
634 | ib_uverbs_event_handler); |
635 | ret = ib_register_event_handler(&uverbs_file->event_handler); | |
636 | if (ret) | |
637 | goto err_put_file; | |
638 | ||
639 | /* At that point async file stuff was fully set */ | |
640 | ev_file->is_async = 1; | |
641 | } | |
642 | ||
643 | return filp; | |
644 | ||
645 | err_put_file: | |
646 | fput(filp); | |
647 | kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file); | |
648 | uverbs_file->async_file = NULL; | |
649 | return ERR_PTR(ret); | |
a7dab9e8 | 650 | |
03c40442 YH |
651 | err_put_refs: |
652 | kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file); | |
653 | kref_put(&ev_file->ref, ib_uverbs_release_event_file); | |
6b73597e | 654 | return filp; |
6b73597e RD |
655 | } |
656 | ||
657 | /* | |
658 | * Look up a completion event file by FD. If lookup is successful, | |
659 | * takes a ref to the event file struct that it returns; if | |
660 | * unsuccessful, returns NULL. | |
661 | */ | |
662 | struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) | |
663 | { | |
664 | struct ib_uverbs_event_file *ev_file = NULL; | |
2903ff01 | 665 | struct fd f = fdget(fd); |
6b73597e | 666 | |
2903ff01 | 667 | if (!f.file) |
6b73597e RD |
668 | return NULL; |
669 | ||
2903ff01 | 670 | if (f.file->f_op != &uverbs_event_fops) |
6b73597e RD |
671 | goto out; |
672 | ||
2903ff01 | 673 | ev_file = f.file->private_data; |
6b73597e RD |
674 | if (ev_file->is_async) { |
675 | ev_file = NULL; | |
676 | goto out; | |
677 | } | |
678 | ||
679 | kref_get(&ev_file->ref); | |
680 | ||
681 | out: | |
2903ff01 | 682 | fdput(f); |
6b73597e | 683 | return ev_file; |
bc38a6ab RD |
684 | } |
685 | ||
2dbd5186 EC |
686 | static int verify_command_mask(struct ib_device *ib_dev, __u32 command) |
687 | { | |
688 | u64 mask; | |
689 | ||
690 | if (command <= IB_USER_VERBS_CMD_OPEN_QP) | |
691 | mask = ib_dev->uverbs_cmd_mask; | |
692 | else | |
693 | mask = ib_dev->uverbs_ex_cmd_mask; | |
694 | ||
695 | if (mask & ((u64)1 << command)) | |
696 | return 0; | |
697 | ||
698 | return -1; | |
699 | } | |
700 | ||
bc38a6ab RD |
701 | static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, |
702 | size_t count, loff_t *pos) | |
703 | { | |
704 | struct ib_uverbs_file *file = filp->private_data; | |
036b1063 | 705 | struct ib_device *ib_dev; |
bc38a6ab | 706 | struct ib_uverbs_cmd_hdr hdr; |
74a0b0a5 | 707 | __u32 command; |
f21519b2 | 708 | __u32 flags; |
036b1063 YH |
709 | int srcu_key; |
710 | ssize_t ret; | |
057aec0d | 711 | |
bc38a6ab RD |
712 | if (count < sizeof hdr) |
713 | return -EINVAL; | |
714 | ||
715 | if (copy_from_user(&hdr, buf, sizeof hdr)) | |
716 | return -EFAULT; | |
717 | ||
036b1063 YH |
718 | srcu_key = srcu_read_lock(&file->device->disassociate_srcu); |
719 | ib_dev = srcu_dereference(file->device->ib_dev, | |
720 | &file->device->disassociate_srcu); | |
721 | if (!ib_dev) { | |
722 | ret = -EIO; | |
723 | goto out; | |
724 | } | |
725 | ||
74a0b0a5 EC |
726 | if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK | |
727 | IB_USER_VERBS_CMD_COMMAND_MASK)) { | |
728 | ret = -EINVAL; | |
729 | goto out; | |
730 | } | |
731 | ||
732 | command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK; | |
2dbd5186 EC |
733 | if (verify_command_mask(ib_dev, command)) { |
734 | ret = -EOPNOTSUPP; | |
735 | goto out; | |
736 | } | |
74a0b0a5 | 737 | |
f21519b2 YD |
738 | flags = (hdr.command & |
739 | IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT; | |
bc38a6ab | 740 | |
f21519b2 | 741 | if (!flags) { |
f21519b2 | 742 | if (command >= ARRAY_SIZE(uverbs_cmd_table) || |
036b1063 YH |
743 | !uverbs_cmd_table[command]) { |
744 | ret = -EINVAL; | |
745 | goto out; | |
746 | } | |
400dbc96 | 747 | |
f21519b2 | 748 | if (!file->ucontext && |
036b1063 YH |
749 | command != IB_USER_VERBS_CMD_GET_CONTEXT) { |
750 | ret = -EINVAL; | |
751 | goto out; | |
752 | } | |
400dbc96 | 753 | |
036b1063 YH |
754 | if (hdr.in_words * 4 != count) { |
755 | ret = -EINVAL; | |
756 | goto out; | |
757 | } | |
400dbc96 | 758 | |
036b1063 | 759 | ret = uverbs_cmd_table[command](file, ib_dev, |
f21519b2 YD |
760 | buf + sizeof(hdr), |
761 | hdr.in_words * 4, | |
762 | hdr.out_words * 4); | |
763 | ||
f21519b2 | 764 | } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) { |
f21519b2 YD |
765 | struct ib_uverbs_ex_cmd_hdr ex_hdr; |
766 | struct ib_udata ucore; | |
767 | struct ib_udata uhw; | |
f21519b2 YD |
768 | size_t written_count = count; |
769 | ||
f21519b2 | 770 | if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) || |
036b1063 YH |
771 | !uverbs_ex_cmd_table[command]) { |
772 | ret = -ENOSYS; | |
773 | goto out; | |
774 | } | |
f21519b2 | 775 | |
036b1063 YH |
776 | if (!file->ucontext) { |
777 | ret = -EINVAL; | |
778 | goto out; | |
779 | } | |
f21519b2 | 780 | |
036b1063 YH |
781 | if (count < (sizeof(hdr) + sizeof(ex_hdr))) { |
782 | ret = -EINVAL; | |
783 | goto out; | |
784 | } | |
f21519b2 | 785 | |
036b1063 YH |
786 | if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) { |
787 | ret = -EFAULT; | |
788 | goto out; | |
789 | } | |
f21519b2 YD |
790 | |
791 | count -= sizeof(hdr) + sizeof(ex_hdr); | |
792 | buf += sizeof(hdr) + sizeof(ex_hdr); | |
793 | ||
036b1063 YH |
794 | if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) { |
795 | ret = -EINVAL; | |
796 | goto out; | |
797 | } | |
f21519b2 | 798 | |
036b1063 YH |
799 | if (ex_hdr.cmd_hdr_reserved) { |
800 | ret = -EINVAL; | |
801 | goto out; | |
802 | } | |
7efb1b19 | 803 | |
f21519b2 | 804 | if (ex_hdr.response) { |
036b1063 YH |
805 | if (!hdr.out_words && !ex_hdr.provider_out_words) { |
806 | ret = -EINVAL; | |
807 | goto out; | |
808 | } | |
6cc3df84 YD |
809 | |
810 | if (!access_ok(VERIFY_WRITE, | |
811 | (void __user *) (unsigned long) ex_hdr.response, | |
036b1063 YH |
812 | (hdr.out_words + ex_hdr.provider_out_words) * 8)) { |
813 | ret = -EFAULT; | |
814 | goto out; | |
815 | } | |
f21519b2 | 816 | } else { |
036b1063 YH |
817 | if (hdr.out_words || ex_hdr.provider_out_words) { |
818 | ret = -EINVAL; | |
819 | goto out; | |
820 | } | |
f21519b2 YD |
821 | } |
822 | ||
a96e4e2f RD |
823 | INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response, |
824 | hdr.in_words * 8, hdr.out_words * 8); | |
825 | ||
826 | INIT_UDATA_BUF_OR_NULL(&uhw, | |
827 | buf + ucore.inlen, | |
828 | (unsigned long) ex_hdr.response + ucore.outlen, | |
829 | ex_hdr.provider_in_words * 8, | |
830 | ex_hdr.provider_out_words * 8); | |
f21519b2 | 831 | |
036b1063 | 832 | ret = uverbs_ex_cmd_table[command](file, |
057aec0d | 833 | ib_dev, |
f21519b2 YD |
834 | &ucore, |
835 | &uhw); | |
036b1063 YH |
836 | if (!ret) |
837 | ret = written_count; | |
838 | } else { | |
839 | ret = -ENOSYS; | |
400dbc96 | 840 | } |
f21519b2 | 841 | |
036b1063 YH |
842 | out: |
843 | srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); | |
844 | return ret; | |
bc38a6ab RD |
845 | } |
846 | ||
847 | static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) | |
848 | { | |
849 | struct ib_uverbs_file *file = filp->private_data; | |
036b1063 YH |
850 | struct ib_device *ib_dev; |
851 | int ret = 0; | |
852 | int srcu_key; | |
bc38a6ab | 853 | |
036b1063 YH |
854 | srcu_key = srcu_read_lock(&file->device->disassociate_srcu); |
855 | ib_dev = srcu_dereference(file->device->ib_dev, | |
856 | &file->device->disassociate_srcu); | |
857 | if (!ib_dev) { | |
858 | ret = -EIO; | |
859 | goto out; | |
860 | } | |
861 | ||
862 | if (!file->ucontext) | |
863 | ret = -ENODEV; | |
bc38a6ab | 864 | else |
036b1063 YH |
865 | ret = ib_dev->mmap(file->ucontext, vma); |
866 | out: | |
867 | srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); | |
868 | return ret; | |
bc38a6ab RD |
869 | } |
870 | ||
5b2d281a RD |
871 | /* |
872 | * ib_uverbs_open() does not need the BKL: | |
873 | * | |
2a72f212 | 874 | * - the ib_uverbs_device structures are properly reference counted and |
5b2d281a RD |
875 | * everything else is purely local to the file being created, so |
876 | * races against other open calls are not a problem; | |
877 | * - there is no ioctl method to race against; | |
2a72f212 AC |
878 | * - the open method will either immediately run -ENXIO, or all |
879 | * required initialization will be done. | |
5b2d281a | 880 | */ |
bc38a6ab RD |
881 | static int ib_uverbs_open(struct inode *inode, struct file *filp) |
882 | { | |
70a30e16 | 883 | struct ib_uverbs_device *dev; |
bc38a6ab | 884 | struct ib_uverbs_file *file; |
036b1063 | 885 | struct ib_device *ib_dev; |
70a30e16 | 886 | int ret; |
036b1063 YH |
887 | int module_dependent; |
888 | int srcu_key; | |
bc38a6ab | 889 | |
2a72f212 | 890 | dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); |
35d4a0b6 | 891 | if (!atomic_inc_not_zero(&dev->refcount)) |
70a30e16 RD |
892 | return -ENXIO; |
893 | ||
036b1063 YH |
894 | srcu_key = srcu_read_lock(&dev->disassociate_srcu); |
895 | mutex_lock(&dev->lists_mutex); | |
896 | ib_dev = srcu_dereference(dev->ib_dev, | |
897 | &dev->disassociate_srcu); | |
898 | if (!ib_dev) { | |
899 | ret = -EIO; | |
70a30e16 RD |
900 | goto err; |
901 | } | |
bc38a6ab | 902 | |
036b1063 YH |
903 | /* In case IB device supports disassociate ucontext, there is no hard |
904 | * dependency between uverbs device and its low level device. | |
905 | */ | |
906 | module_dependent = !(ib_dev->disassociate_ucontext); | |
907 | ||
908 | if (module_dependent) { | |
909 | if (!try_module_get(ib_dev->owner)) { | |
910 | ret = -ENODEV; | |
911 | goto err; | |
912 | } | |
913 | } | |
914 | ||
915 | file = kzalloc(sizeof(*file), GFP_KERNEL); | |
63c47c28 | 916 | if (!file) { |
70a30e16 | 917 | ret = -ENOMEM; |
036b1063 YH |
918 | if (module_dependent) |
919 | goto err_module; | |
920 | ||
921 | goto err; | |
63c47c28 | 922 | } |
bc38a6ab | 923 | |
70a30e16 RD |
924 | file->device = dev; |
925 | file->ucontext = NULL; | |
926 | file->async_file = NULL; | |
bc38a6ab | 927 | kref_init(&file->ref); |
95ed644f | 928 | mutex_init(&file->mutex); |
bc38a6ab | 929 | |
bc38a6ab | 930 | filp->private_data = file; |
35d4a0b6 | 931 | kobject_get(&dev->kobj); |
036b1063 YH |
932 | list_add_tail(&file->list, &dev->uverbs_file_list); |
933 | mutex_unlock(&dev->lists_mutex); | |
934 | srcu_read_unlock(&dev->disassociate_srcu, srcu_key); | |
bc38a6ab | 935 | |
bc1db9af | 936 | return nonseekable_open(inode, filp); |
70a30e16 RD |
937 | |
938 | err_module: | |
036b1063 | 939 | module_put(ib_dev->owner); |
70a30e16 RD |
940 | |
941 | err: | |
036b1063 YH |
942 | mutex_unlock(&dev->lists_mutex); |
943 | srcu_read_unlock(&dev->disassociate_srcu, srcu_key); | |
35d4a0b6 YH |
944 | if (atomic_dec_and_test(&dev->refcount)) |
945 | ib_uverbs_comp_dev(dev); | |
946 | ||
70a30e16 | 947 | return ret; |
bc38a6ab RD |
948 | } |
949 | ||
950 | static int ib_uverbs_close(struct inode *inode, struct file *filp) | |
951 | { | |
952 | struct ib_uverbs_file *file = filp->private_data; | |
35d4a0b6 | 953 | struct ib_uverbs_device *dev = file->device; |
036b1063 YH |
954 | struct ib_ucontext *ucontext = NULL; |
955 | ||
956 | mutex_lock(&file->device->lists_mutex); | |
957 | ucontext = file->ucontext; | |
958 | file->ucontext = NULL; | |
959 | if (!file->is_closed) { | |
960 | list_del(&file->list); | |
961 | file->is_closed = 1; | |
962 | } | |
963 | mutex_unlock(&file->device->lists_mutex); | |
964 | if (ucontext) | |
965 | ib_uverbs_cleanup_ucontext(file, ucontext); | |
70a30e16 RD |
966 | |
967 | if (file->async_file) | |
968 | kref_put(&file->async_file->ref, ib_uverbs_release_event_file); | |
bc38a6ab | 969 | |
bc38a6ab | 970 | kref_put(&file->ref, ib_uverbs_release_file); |
35d4a0b6 | 971 | kobject_put(&dev->kobj); |
bc38a6ab RD |
972 | |
973 | return 0; | |
974 | } | |
975 | ||
2b8693c0 | 976 | static const struct file_operations uverbs_fops = { |
9afed76d AC |
977 | .owner = THIS_MODULE, |
978 | .write = ib_uverbs_write, | |
979 | .open = ib_uverbs_open, | |
bc1db9af RD |
980 | .release = ib_uverbs_close, |
981 | .llseek = no_llseek, | |
bc38a6ab RD |
982 | }; |
983 | ||
2b8693c0 | 984 | static const struct file_operations uverbs_mmap_fops = { |
9afed76d AC |
985 | .owner = THIS_MODULE, |
986 | .write = ib_uverbs_write, | |
bc38a6ab | 987 | .mmap = ib_uverbs_mmap, |
9afed76d | 988 | .open = ib_uverbs_open, |
bc1db9af RD |
989 | .release = ib_uverbs_close, |
990 | .llseek = no_llseek, | |
bc38a6ab RD |
991 | }; |
992 | ||
993 | static struct ib_client uverbs_client = { | |
994 | .name = "uverbs", | |
995 | .add = ib_uverbs_add_one, | |
996 | .remove = ib_uverbs_remove_one | |
997 | }; | |
998 | ||
f4e91eb4 TJ |
999 | static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, |
1000 | char *buf) | |
bc38a6ab | 1001 | { |
036b1063 YH |
1002 | int ret = -ENODEV; |
1003 | int srcu_key; | |
f4e91eb4 | 1004 | struct ib_uverbs_device *dev = dev_get_drvdata(device); |
036b1063 | 1005 | struct ib_device *ib_dev; |
70a30e16 RD |
1006 | |
1007 | if (!dev) | |
1008 | return -ENODEV; | |
bc38a6ab | 1009 | |
036b1063 YH |
1010 | srcu_key = srcu_read_lock(&dev->disassociate_srcu); |
1011 | ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); | |
1012 | if (ib_dev) | |
1013 | ret = sprintf(buf, "%s\n", ib_dev->name); | |
1014 | srcu_read_unlock(&dev->disassociate_srcu, srcu_key); | |
1015 | ||
1016 | return ret; | |
bc38a6ab | 1017 | } |
f4e91eb4 | 1018 | static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); |
bc38a6ab | 1019 | |
f4e91eb4 TJ |
1020 | static ssize_t show_dev_abi_version(struct device *device, |
1021 | struct device_attribute *attr, char *buf) | |
274c0891 | 1022 | { |
f4e91eb4 | 1023 | struct ib_uverbs_device *dev = dev_get_drvdata(device); |
036b1063 YH |
1024 | int ret = -ENODEV; |
1025 | int srcu_key; | |
1026 | struct ib_device *ib_dev; | |
70a30e16 RD |
1027 | |
1028 | if (!dev) | |
1029 | return -ENODEV; | |
036b1063 YH |
1030 | srcu_key = srcu_read_lock(&dev->disassociate_srcu); |
1031 | ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); | |
1032 | if (ib_dev) | |
1033 | ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver); | |
1034 | srcu_read_unlock(&dev->disassociate_srcu, srcu_key); | |
274c0891 | 1035 | |
036b1063 | 1036 | return ret; |
274c0891 | 1037 | } |
f4e91eb4 | 1038 | static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); |
274c0891 | 1039 | |
0933e2d9 AK |
1040 | static CLASS_ATTR_STRING(abi_version, S_IRUGO, |
1041 | __stringify(IB_USER_VERBS_ABI_VERSION)); | |
bc38a6ab | 1042 | |
6d6a0e71 AC |
1043 | static dev_t overflow_maj; |
1044 | static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES); | |
1045 | ||
1046 | /* | |
1047 | * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by | |
1048 | * requesting a new major number and doubling the number of max devices we | |
1049 | * support. It's stupid, but simple. | |
1050 | */ | |
1051 | static int find_overflow_devnum(void) | |
1052 | { | |
1053 | int ret; | |
1054 | ||
1055 | if (!overflow_maj) { | |
1056 | ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES, | |
1057 | "infiniband_verbs"); | |
1058 | if (ret) { | |
1059 | printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n"); | |
1060 | return ret; | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES); | |
1065 | if (ret >= IB_UVERBS_MAX_DEVICES) | |
1066 | return -1; | |
1067 | ||
1068 | return ret; | |
1069 | } | |
1070 | ||
bc38a6ab RD |
1071 | static void ib_uverbs_add_one(struct ib_device *device) |
1072 | { | |
38707980 | 1073 | int devnum; |
ddbd6883 | 1074 | dev_t base; |
bc38a6ab | 1075 | struct ib_uverbs_device *uverbs_dev; |
036b1063 | 1076 | int ret; |
bc38a6ab RD |
1077 | |
1078 | if (!device->alloc_ucontext) | |
1079 | return; | |
1080 | ||
de6eb66b | 1081 | uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); |
bc38a6ab RD |
1082 | if (!uverbs_dev) |
1083 | return; | |
1084 | ||
036b1063 YH |
1085 | ret = init_srcu_struct(&uverbs_dev->disassociate_srcu); |
1086 | if (ret) { | |
1087 | kfree(uverbs_dev); | |
1088 | return; | |
1089 | } | |
1090 | ||
35d4a0b6 | 1091 | atomic_set(&uverbs_dev->refcount, 1); |
fd60ae40 | 1092 | init_completion(&uverbs_dev->comp); |
53d0bd1e SH |
1093 | uverbs_dev->xrcd_tree = RB_ROOT; |
1094 | mutex_init(&uverbs_dev->xrcd_tree_mutex); | |
35d4a0b6 | 1095 | kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype); |
036b1063 YH |
1096 | mutex_init(&uverbs_dev->lists_mutex); |
1097 | INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list); | |
1098 | INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list); | |
70a30e16 | 1099 | |
bc38a6ab | 1100 | spin_lock(&map_lock); |
38707980 AC |
1101 | devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); |
1102 | if (devnum >= IB_UVERBS_MAX_DEVICES) { | |
bc38a6ab | 1103 | spin_unlock(&map_lock); |
6d6a0e71 AC |
1104 | devnum = find_overflow_devnum(); |
1105 | if (devnum < 0) | |
1106 | goto err; | |
1107 | ||
1108 | spin_lock(&map_lock); | |
1109 | uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES; | |
1110 | base = devnum + overflow_maj; | |
1111 | set_bit(devnum, overflow_map); | |
1112 | } else { | |
1113 | uverbs_dev->devnum = devnum; | |
1114 | base = devnum + IB_UVERBS_BASE_DEV; | |
1115 | set_bit(devnum, dev_map); | |
bc38a6ab | 1116 | } |
bc38a6ab RD |
1117 | spin_unlock(&map_lock); |
1118 | ||
036b1063 | 1119 | rcu_assign_pointer(uverbs_dev->ib_dev, device); |
f4fd0b22 | 1120 | uverbs_dev->num_comp_vectors = device->num_comp_vectors; |
bc38a6ab | 1121 | |
055422dd AC |
1122 | cdev_init(&uverbs_dev->cdev, NULL); |
1123 | uverbs_dev->cdev.owner = THIS_MODULE; | |
1124 | uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; | |
35d4a0b6 | 1125 | uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj; |
055422dd | 1126 | kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); |
ddbd6883 | 1127 | if (cdev_add(&uverbs_dev->cdev, base, 1)) |
70a30e16 | 1128 | goto err_cdev; |
bc38a6ab | 1129 | |
91bd418f | 1130 | uverbs_dev->dev = device_create(uverbs_class, device->dma_device, |
055422dd | 1131 | uverbs_dev->cdev.dev, uverbs_dev, |
91bd418f | 1132 | "uverbs%d", uverbs_dev->devnum); |
f4e91eb4 | 1133 | if (IS_ERR(uverbs_dev->dev)) |
bc38a6ab RD |
1134 | goto err_cdev; |
1135 | ||
f4e91eb4 | 1136 | if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) |
bc38a6ab | 1137 | goto err_class; |
f4e91eb4 | 1138 | if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) |
274c0891 | 1139 | goto err_class; |
bc38a6ab RD |
1140 | |
1141 | ib_set_client_data(device, &uverbs_client, uverbs_dev); | |
1142 | ||
1143 | return; | |
1144 | ||
1145 | err_class: | |
055422dd | 1146 | device_destroy(uverbs_class, uverbs_dev->cdev.dev); |
bc38a6ab RD |
1147 | |
1148 | err_cdev: | |
055422dd | 1149 | cdev_del(&uverbs_dev->cdev); |
6d6a0e71 AC |
1150 | if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) |
1151 | clear_bit(devnum, dev_map); | |
1152 | else | |
1153 | clear_bit(devnum, overflow_map); | |
bc38a6ab RD |
1154 | |
1155 | err: | |
35d4a0b6 YH |
1156 | if (atomic_dec_and_test(&uverbs_dev->refcount)) |
1157 | ib_uverbs_comp_dev(uverbs_dev); | |
fd60ae40 | 1158 | wait_for_completion(&uverbs_dev->comp); |
35d4a0b6 | 1159 | kobject_put(&uverbs_dev->kobj); |
bc38a6ab RD |
1160 | return; |
1161 | } | |
1162 | ||
036b1063 YH |
1163 | static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev, |
1164 | struct ib_device *ib_dev) | |
1165 | { | |
1166 | struct ib_uverbs_file *file; | |
1167 | struct ib_uverbs_event_file *event_file; | |
1168 | struct ib_event event; | |
1169 | ||
1170 | /* Pending running commands to terminate */ | |
1171 | synchronize_srcu(&uverbs_dev->disassociate_srcu); | |
1172 | event.event = IB_EVENT_DEVICE_FATAL; | |
1173 | event.element.port_num = 0; | |
1174 | event.device = ib_dev; | |
1175 | ||
1176 | mutex_lock(&uverbs_dev->lists_mutex); | |
1177 | while (!list_empty(&uverbs_dev->uverbs_file_list)) { | |
1178 | struct ib_ucontext *ucontext; | |
1179 | ||
1180 | file = list_first_entry(&uverbs_dev->uverbs_file_list, | |
1181 | struct ib_uverbs_file, list); | |
1182 | file->is_closed = 1; | |
1183 | ucontext = file->ucontext; | |
1184 | list_del(&file->list); | |
1185 | file->ucontext = NULL; | |
1186 | kref_get(&file->ref); | |
1187 | mutex_unlock(&uverbs_dev->lists_mutex); | |
1188 | /* We must release the mutex before going ahead and calling | |
1189 | * disassociate_ucontext. disassociate_ucontext might end up | |
1190 | * indirectly calling uverbs_close, for example due to freeing | |
1191 | * the resources (e.g mmput). | |
1192 | */ | |
1193 | ib_uverbs_event_handler(&file->event_handler, &event); | |
1194 | if (ucontext) { | |
1195 | ib_dev->disassociate_ucontext(ucontext); | |
1196 | ib_uverbs_cleanup_ucontext(file, ucontext); | |
1197 | } | |
1198 | ||
1199 | mutex_lock(&uverbs_dev->lists_mutex); | |
1200 | kref_put(&file->ref, ib_uverbs_release_file); | |
1201 | } | |
1202 | ||
1203 | while (!list_empty(&uverbs_dev->uverbs_events_file_list)) { | |
1204 | event_file = list_first_entry(&uverbs_dev-> | |
1205 | uverbs_events_file_list, | |
1206 | struct ib_uverbs_event_file, | |
1207 | list); | |
1208 | spin_lock_irq(&event_file->lock); | |
1209 | event_file->is_closed = 1; | |
1210 | spin_unlock_irq(&event_file->lock); | |
1211 | ||
1212 | list_del(&event_file->list); | |
1213 | if (event_file->is_async) { | |
1214 | ib_unregister_event_handler(&event_file->uverbs_file-> | |
1215 | event_handler); | |
1216 | event_file->uverbs_file->event_handler.device = NULL; | |
1217 | } | |
1218 | ||
1219 | wake_up_interruptible(&event_file->poll_wait); | |
1220 | kill_fasync(&event_file->async_queue, SIGIO, POLL_IN); | |
1221 | } | |
1222 | mutex_unlock(&uverbs_dev->lists_mutex); | |
1223 | } | |
1224 | ||
7c1eb45a | 1225 | static void ib_uverbs_remove_one(struct ib_device *device, void *client_data) |
bc38a6ab | 1226 | { |
7c1eb45a | 1227 | struct ib_uverbs_device *uverbs_dev = client_data; |
036b1063 | 1228 | int wait_clients = 1; |
bc38a6ab RD |
1229 | |
1230 | if (!uverbs_dev) | |
1231 | return; | |
1232 | ||
f4e91eb4 | 1233 | dev_set_drvdata(uverbs_dev->dev, NULL); |
055422dd AC |
1234 | device_destroy(uverbs_class, uverbs_dev->cdev.dev); |
1235 | cdev_del(&uverbs_dev->cdev); | |
70a30e16 | 1236 | |
6d6a0e71 AC |
1237 | if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) |
1238 | clear_bit(uverbs_dev->devnum, dev_map); | |
1239 | else | |
1240 | clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map); | |
fd60ae40 | 1241 | |
036b1063 YH |
1242 | if (device->disassociate_ucontext) { |
1243 | /* We disassociate HW resources and immediately return. | |
1244 | * Userspace will see a EIO errno for all future access. | |
1245 | * Upon returning, ib_device may be freed internally and is not | |
1246 | * valid any more. | |
1247 | * uverbs_device is still available until all clients close | |
1248 | * their files, then the uverbs device ref count will be zero | |
1249 | * and its resources will be freed. | |
1250 | * Note: At this point no more files can be opened since the | |
1251 | * cdev was deleted, however active clients can still issue | |
1252 | * commands and close their open files. | |
1253 | */ | |
1254 | rcu_assign_pointer(uverbs_dev->ib_dev, NULL); | |
1255 | ib_uverbs_free_hw_resources(uverbs_dev, device); | |
1256 | wait_clients = 0; | |
1257 | } | |
1258 | ||
35d4a0b6 YH |
1259 | if (atomic_dec_and_test(&uverbs_dev->refcount)) |
1260 | ib_uverbs_comp_dev(uverbs_dev); | |
036b1063 YH |
1261 | if (wait_clients) |
1262 | wait_for_completion(&uverbs_dev->comp); | |
35d4a0b6 | 1263 | kobject_put(&uverbs_dev->kobj); |
bc38a6ab RD |
1264 | } |
1265 | ||
2c9ede55 | 1266 | static char *uverbs_devnode(struct device *dev, umode_t *mode) |
71c29bd5 | 1267 | { |
b2bc4782 GR |
1268 | if (mode) |
1269 | *mode = 0666; | |
71c29bd5 RD |
1270 | return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); |
1271 | } | |
1272 | ||
bc38a6ab RD |
1273 | static int __init ib_uverbs_init(void) |
1274 | { | |
1275 | int ret; | |
1276 | ||
bc38a6ab RD |
1277 | ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, |
1278 | "infiniband_verbs"); | |
1279 | if (ret) { | |
1280 | printk(KERN_ERR "user_verbs: couldn't register device number\n"); | |
1281 | goto out; | |
1282 | } | |
1283 | ||
70a30e16 RD |
1284 | uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); |
1285 | if (IS_ERR(uverbs_class)) { | |
1286 | ret = PTR_ERR(uverbs_class); | |
bc38a6ab RD |
1287 | printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); |
1288 | goto out_chrdev; | |
1289 | } | |
1290 | ||
71c29bd5 RD |
1291 | uverbs_class->devnode = uverbs_devnode; |
1292 | ||
0933e2d9 | 1293 | ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); |
bc38a6ab RD |
1294 | if (ret) { |
1295 | printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); | |
1296 | goto out_class; | |
1297 | } | |
1298 | ||
bc38a6ab RD |
1299 | ret = ib_register_client(&uverbs_client); |
1300 | if (ret) { | |
1301 | printk(KERN_ERR "user_verbs: couldn't register client\n"); | |
a265e558 | 1302 | goto out_class; |
bc38a6ab RD |
1303 | } |
1304 | ||
1305 | return 0; | |
1306 | ||
bc38a6ab | 1307 | out_class: |
70a30e16 | 1308 | class_destroy(uverbs_class); |
bc38a6ab RD |
1309 | |
1310 | out_chrdev: | |
1311 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); | |
1312 | ||
1313 | out: | |
1314 | return ret; | |
1315 | } | |
1316 | ||
1317 | static void __exit ib_uverbs_cleanup(void) | |
1318 | { | |
1319 | ib_unregister_client(&uverbs_client); | |
70a30e16 | 1320 | class_destroy(uverbs_class); |
bc38a6ab | 1321 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); |
6d6a0e71 AC |
1322 | if (overflow_maj) |
1323 | unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES); | |
5d7edb3c RD |
1324 | idr_destroy(&ib_uverbs_pd_idr); |
1325 | idr_destroy(&ib_uverbs_mr_idr); | |
1326 | idr_destroy(&ib_uverbs_mw_idr); | |
1327 | idr_destroy(&ib_uverbs_ah_idr); | |
1328 | idr_destroy(&ib_uverbs_cq_idr); | |
1329 | idr_destroy(&ib_uverbs_qp_idr); | |
1330 | idr_destroy(&ib_uverbs_srq_idr); | |
bc38a6ab RD |
1331 | } |
1332 | ||
1333 | module_init(ib_uverbs_init); | |
1334 | module_exit(ib_uverbs_cleanup); |