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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 | ||
e6bd18f5 JG |
51 | #include <rdma/ib.h> |
52 | ||
bc38a6ab RD |
53 | #include "uverbs.h" |
54 | ||
55 | MODULE_AUTHOR("Roland Dreier"); | |
56 | MODULE_DESCRIPTION("InfiniBand userspace verbs access"); | |
57 | MODULE_LICENSE("Dual BSD/GPL"); | |
58 | ||
bc38a6ab RD |
59 | enum { |
60 | IB_UVERBS_MAJOR = 231, | |
61 | IB_UVERBS_BASE_MINOR = 192, | |
62 | IB_UVERBS_MAX_DEVICES = 32 | |
63 | }; | |
64 | ||
65 | #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR) | |
66 | ||
70a30e16 RD |
67 | static struct class *uverbs_class; |
68 | ||
9ead190b | 69 | DEFINE_SPINLOCK(ib_uverbs_idr_lock); |
bc38a6ab RD |
70 | DEFINE_IDR(ib_uverbs_pd_idr); |
71 | DEFINE_IDR(ib_uverbs_mr_idr); | |
72 | DEFINE_IDR(ib_uverbs_mw_idr); | |
73 | DEFINE_IDR(ib_uverbs_ah_idr); | |
74 | DEFINE_IDR(ib_uverbs_cq_idr); | |
75 | DEFINE_IDR(ib_uverbs_qp_idr); | |
f520ba5a | 76 | DEFINE_IDR(ib_uverbs_srq_idr); |
53d0bd1e | 77 | DEFINE_IDR(ib_uverbs_xrcd_idr); |
436f2ad0 | 78 | DEFINE_IDR(ib_uverbs_rule_idr); |
bc38a6ab | 79 | |
6276e08a | 80 | static DEFINE_SPINLOCK(map_lock); |
bc38a6ab RD |
81 | static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); |
82 | ||
83 | static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, | |
057aec0d | 84 | struct ib_device *ib_dev, |
bc38a6ab RD |
85 | const char __user *buf, int in_len, |
86 | int out_len) = { | |
9afed76d AC |
87 | [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, |
88 | [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, | |
89 | [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, | |
90 | [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, | |
91 | [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, | |
92 | [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, | |
7e6edb9b | 93 | [IB_USER_VERBS_CMD_REREG_MR] = ib_uverbs_rereg_mr, |
9afed76d | 94 | [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, |
6b52a12b SM |
95 | [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw, |
96 | [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw, | |
6b73597e | 97 | [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, |
9afed76d AC |
98 | [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, |
99 | [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq, | |
100 | [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, | |
101 | [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, | |
102 | [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, | |
103 | [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, | |
104 | [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp, | |
105 | [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, | |
106 | [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, | |
107 | [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, | |
108 | [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, | |
109 | [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, | |
110 | [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, | |
111 | [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, | |
112 | [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, | |
113 | [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, | |
114 | [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, | |
115 | [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, | |
116 | [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq, | |
117 | [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, | |
53d0bd1e SH |
118 | [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd, |
119 | [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd, | |
42849b26 | 120 | [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq, |
436f2ad0 | 121 | [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp, |
f21519b2 YD |
122 | }; |
123 | ||
f21519b2 | 124 | static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file, |
057aec0d | 125 | struct ib_device *ib_dev, |
f21519b2 YD |
126 | struct ib_udata *ucore, |
127 | struct ib_udata *uhw) = { | |
128 | [IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow, | |
5a77abf9 | 129 | [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow, |
02d1aa7a | 130 | [IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device, |
565197dd | 131 | [IB_USER_VERBS_EX_CMD_CREATE_CQ] = ib_uverbs_ex_create_cq, |
6d8a7497 | 132 | [IB_USER_VERBS_EX_CMD_CREATE_QP] = ib_uverbs_ex_create_qp, |
bc38a6ab RD |
133 | }; |
134 | ||
bc38a6ab | 135 | static void ib_uverbs_add_one(struct ib_device *device); |
7c1eb45a | 136 | static void ib_uverbs_remove_one(struct ib_device *device, void *client_data); |
bc38a6ab | 137 | |
feb7c1e3 CH |
138 | int uverbs_dealloc_mw(struct ib_mw *mw) |
139 | { | |
140 | struct ib_pd *pd = mw->pd; | |
141 | int ret; | |
142 | ||
143 | ret = mw->device->dealloc_mw(mw); | |
144 | if (!ret) | |
145 | atomic_dec(&pd->usecnt); | |
146 | return ret; | |
147 | } | |
148 | ||
35d4a0b6 | 149 | static void ib_uverbs_release_dev(struct kobject *kobj) |
70a30e16 RD |
150 | { |
151 | struct ib_uverbs_device *dev = | |
35d4a0b6 | 152 | container_of(kobj, struct ib_uverbs_device, kobj); |
70a30e16 | 153 | |
036b1063 | 154 | cleanup_srcu_struct(&dev->disassociate_srcu); |
35d4a0b6 | 155 | kfree(dev); |
70a30e16 RD |
156 | } |
157 | ||
35d4a0b6 YH |
158 | static struct kobj_type ib_uverbs_dev_ktype = { |
159 | .release = ib_uverbs_release_dev, | |
160 | }; | |
161 | ||
04d29b0e RD |
162 | static void ib_uverbs_release_event_file(struct kref *ref) |
163 | { | |
164 | struct ib_uverbs_event_file *file = | |
165 | container_of(ref, struct ib_uverbs_event_file, ref); | |
166 | ||
167 | kfree(file); | |
168 | } | |
169 | ||
70a30e16 RD |
170 | void ib_uverbs_release_ucq(struct ib_uverbs_file *file, |
171 | struct ib_uverbs_event_file *ev_file, | |
172 | struct ib_ucq_object *uobj) | |
173 | { | |
174 | struct ib_uverbs_event *evt, *tmp; | |
175 | ||
176 | if (ev_file) { | |
177 | spin_lock_irq(&ev_file->lock); | |
178 | list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { | |
179 | list_del(&evt->list); | |
180 | kfree(evt); | |
181 | } | |
182 | spin_unlock_irq(&ev_file->lock); | |
183 | ||
184 | kref_put(&ev_file->ref, ib_uverbs_release_event_file); | |
185 | } | |
186 | ||
187 | spin_lock_irq(&file->async_file->lock); | |
188 | list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { | |
189 | list_del(&evt->list); | |
190 | kfree(evt); | |
191 | } | |
192 | spin_unlock_irq(&file->async_file->lock); | |
193 | } | |
194 | ||
195 | void ib_uverbs_release_uevent(struct ib_uverbs_file *file, | |
196 | struct ib_uevent_object *uobj) | |
197 | { | |
198 | struct ib_uverbs_event *evt, *tmp; | |
199 | ||
200 | spin_lock_irq(&file->async_file->lock); | |
201 | list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { | |
202 | list_del(&evt->list); | |
203 | kfree(evt); | |
204 | } | |
205 | spin_unlock_irq(&file->async_file->lock); | |
206 | } | |
207 | ||
f4e40156 JM |
208 | static void ib_uverbs_detach_umcast(struct ib_qp *qp, |
209 | struct ib_uqp_object *uobj) | |
210 | { | |
211 | struct ib_uverbs_mcast_entry *mcast, *tmp; | |
212 | ||
213 | list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { | |
214 | ib_detach_mcast(qp, &mcast->gid, mcast->lid); | |
215 | list_del(&mcast->list); | |
216 | kfree(mcast); | |
217 | } | |
218 | } | |
219 | ||
70a30e16 RD |
220 | static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, |
221 | struct ib_ucontext *context) | |
bc38a6ab RD |
222 | { |
223 | struct ib_uobject *uobj, *tmp; | |
224 | ||
f7c6a7b5 RD |
225 | context->closing = 1; |
226 | ||
67cdb40c | 227 | list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { |
9ead190b RD |
228 | struct ib_ah *ah = uobj->object; |
229 | ||
230 | idr_remove_uobj(&ib_uverbs_ah_idr, uobj); | |
67cdb40c | 231 | ib_destroy_ah(ah); |
67cdb40c RD |
232 | kfree(uobj); |
233 | } | |
bc38a6ab | 234 | |
6b52a12b SM |
235 | /* Remove MWs before QPs, in order to support type 2A MWs. */ |
236 | list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) { | |
237 | struct ib_mw *mw = uobj->object; | |
238 | ||
239 | idr_remove_uobj(&ib_uverbs_mw_idr, uobj); | |
feb7c1e3 | 240 | uverbs_dealloc_mw(mw); |
6b52a12b SM |
241 | kfree(uobj); |
242 | } | |
243 | ||
436f2ad0 HHZ |
244 | list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) { |
245 | struct ib_flow *flow_id = uobj->object; | |
246 | ||
247 | idr_remove_uobj(&ib_uverbs_rule_idr, uobj); | |
248 | ib_destroy_flow(flow_id); | |
249 | kfree(uobj); | |
250 | } | |
251 | ||
bc38a6ab | 252 | list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { |
9ead190b | 253 | struct ib_qp *qp = uobj->object; |
f4e40156 JM |
254 | struct ib_uqp_object *uqp = |
255 | container_of(uobj, struct ib_uqp_object, uevent.uobject); | |
9ead190b RD |
256 | |
257 | idr_remove_uobj(&ib_uverbs_qp_idr, uobj); | |
0e0ec7e0 SH |
258 | if (qp != qp->real_qp) { |
259 | ib_close_qp(qp); | |
b93f3c18 SH |
260 | } else { |
261 | ib_uverbs_detach_umcast(qp, uqp); | |
262 | ib_destroy_qp(qp); | |
263 | } | |
f4e40156 JM |
264 | ib_uverbs_release_uevent(file, &uqp->uevent); |
265 | kfree(uqp); | |
bc38a6ab RD |
266 | } |
267 | ||
a233c4b5 SD |
268 | list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { |
269 | struct ib_srq *srq = uobj->object; | |
270 | struct ib_uevent_object *uevent = | |
271 | container_of(uobj, struct ib_uevent_object, uobject); | |
272 | ||
273 | idr_remove_uobj(&ib_uverbs_srq_idr, uobj); | |
274 | ib_destroy_srq(srq); | |
275 | ib_uverbs_release_uevent(file, uevent); | |
276 | kfree(uevent); | |
277 | } | |
278 | ||
bc38a6ab | 279 | list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { |
9ead190b | 280 | struct ib_cq *cq = uobj->object; |
70a30e16 RD |
281 | struct ib_uverbs_event_file *ev_file = cq->cq_context; |
282 | struct ib_ucq_object *ucq = | |
283 | container_of(uobj, struct ib_ucq_object, uobject); | |
9ead190b RD |
284 | |
285 | idr_remove_uobj(&ib_uverbs_cq_idr, uobj); | |
bc38a6ab | 286 | ib_destroy_cq(cq); |
70a30e16 RD |
287 | ib_uverbs_release_ucq(file, ev_file, ucq); |
288 | kfree(ucq); | |
bc38a6ab RD |
289 | } |
290 | ||
bc38a6ab | 291 | list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { |
9ead190b | 292 | struct ib_mr *mr = uobj->object; |
bc38a6ab | 293 | |
9ead190b | 294 | idr_remove_uobj(&ib_uverbs_mr_idr, uobj); |
bc38a6ab | 295 | ib_dereg_mr(mr); |
f7c6a7b5 | 296 | kfree(uobj); |
bc38a6ab RD |
297 | } |
298 | ||
53d0bd1e SH |
299 | mutex_lock(&file->device->xrcd_tree_mutex); |
300 | list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) { | |
301 | struct ib_xrcd *xrcd = uobj->object; | |
302 | struct ib_uxrcd_object *uxrcd = | |
303 | container_of(uobj, struct ib_uxrcd_object, uobject); | |
304 | ||
305 | idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj); | |
306 | ib_uverbs_dealloc_xrcd(file->device, xrcd); | |
307 | kfree(uxrcd); | |
308 | } | |
309 | mutex_unlock(&file->device->xrcd_tree_mutex); | |
310 | ||
bc38a6ab | 311 | list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { |
9ead190b RD |
312 | struct ib_pd *pd = uobj->object; |
313 | ||
314 | idr_remove_uobj(&ib_uverbs_pd_idr, uobj); | |
bc38a6ab | 315 | ib_dealloc_pd(pd); |
bc38a6ab RD |
316 | kfree(uobj); |
317 | } | |
318 | ||
8ada2c1c SR |
319 | put_pid(context->tgid); |
320 | ||
bc38a6ab RD |
321 | return context->device->dealloc_ucontext(context); |
322 | } | |
323 | ||
35d4a0b6 YH |
324 | static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev) |
325 | { | |
326 | complete(&dev->comp); | |
327 | } | |
328 | ||
bc38a6ab RD |
329 | static void ib_uverbs_release_file(struct kref *ref) |
330 | { | |
331 | struct ib_uverbs_file *file = | |
332 | container_of(ref, struct ib_uverbs_file, ref); | |
036b1063 YH |
333 | struct ib_device *ib_dev; |
334 | int srcu_key; | |
335 | ||
336 | srcu_key = srcu_read_lock(&file->device->disassociate_srcu); | |
337 | ib_dev = srcu_dereference(file->device->ib_dev, | |
338 | &file->device->disassociate_srcu); | |
339 | if (ib_dev && !ib_dev->disassociate_ucontext) | |
340 | module_put(ib_dev->owner); | |
341 | srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); | |
bc38a6ab | 342 | |
35d4a0b6 YH |
343 | if (atomic_dec_and_test(&file->device->refcount)) |
344 | ib_uverbs_comp_dev(file->device); | |
70a30e16 | 345 | |
bc38a6ab RD |
346 | kfree(file); |
347 | } | |
348 | ||
349 | static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, | |
350 | size_t count, loff_t *pos) | |
351 | { | |
352 | struct ib_uverbs_event_file *file = filp->private_data; | |
63aaf647 | 353 | struct ib_uverbs_event *event; |
bc38a6ab RD |
354 | int eventsz; |
355 | int ret = 0; | |
356 | ||
357 | spin_lock_irq(&file->lock); | |
358 | ||
6b73597e | 359 | while (list_empty(&file->event_list)) { |
bc38a6ab RD |
360 | spin_unlock_irq(&file->lock); |
361 | ||
362 | if (filp->f_flags & O_NONBLOCK) | |
363 | return -EAGAIN; | |
364 | ||
365 | if (wait_event_interruptible(file->poll_wait, | |
036b1063 YH |
366 | (!list_empty(&file->event_list) || |
367 | /* The barriers built into wait_event_interruptible() | |
368 | * and wake_up() guarentee this will see the null set | |
369 | * without using RCU | |
370 | */ | |
371 | !file->uverbs_file->device->ib_dev))) | |
bc38a6ab RD |
372 | return -ERESTARTSYS; |
373 | ||
036b1063 YH |
374 | /* If device was disassociated and no event exists set an error */ |
375 | if (list_empty(&file->event_list) && | |
376 | !file->uverbs_file->device->ib_dev) | |
377 | return -EIO; | |
378 | ||
bc38a6ab RD |
379 | spin_lock_irq(&file->lock); |
380 | } | |
381 | ||
63aaf647 RD |
382 | event = list_entry(file->event_list.next, struct ib_uverbs_event, list); |
383 | ||
384 | if (file->is_async) | |
bc38a6ab | 385 | eventsz = sizeof (struct ib_uverbs_async_event_desc); |
63aaf647 | 386 | else |
bc38a6ab | 387 | eventsz = sizeof (struct ib_uverbs_comp_event_desc); |
bc38a6ab RD |
388 | |
389 | if (eventsz > count) { | |
390 | ret = -EINVAL; | |
391 | event = NULL; | |
63aaf647 | 392 | } else { |
bc38a6ab | 393 | list_del(file->event_list.next); |
63aaf647 RD |
394 | if (event->counter) { |
395 | ++(*event->counter); | |
396 | list_del(&event->obj_list); | |
397 | } | |
398 | } | |
bc38a6ab RD |
399 | |
400 | spin_unlock_irq(&file->lock); | |
401 | ||
402 | if (event) { | |
403 | if (copy_to_user(buf, event, eventsz)) | |
404 | ret = -EFAULT; | |
405 | else | |
406 | ret = eventsz; | |
407 | } | |
408 | ||
409 | kfree(event); | |
410 | ||
411 | return ret; | |
412 | } | |
413 | ||
414 | static unsigned int ib_uverbs_event_poll(struct file *filp, | |
415 | struct poll_table_struct *wait) | |
416 | { | |
417 | unsigned int pollflags = 0; | |
418 | struct ib_uverbs_event_file *file = filp->private_data; | |
419 | ||
420 | poll_wait(filp, &file->poll_wait, wait); | |
421 | ||
422 | spin_lock_irq(&file->lock); | |
6b73597e | 423 | if (!list_empty(&file->event_list)) |
bc38a6ab RD |
424 | pollflags = POLLIN | POLLRDNORM; |
425 | spin_unlock_irq(&file->lock); | |
426 | ||
427 | return pollflags; | |
428 | } | |
429 | ||
abdf119b GN |
430 | static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) |
431 | { | |
432 | struct ib_uverbs_event_file *file = filp->private_data; | |
433 | ||
434 | return fasync_helper(fd, filp, on, &file->async_queue); | |
435 | } | |
436 | ||
bc38a6ab RD |
437 | static int ib_uverbs_event_close(struct inode *inode, struct file *filp) |
438 | { | |
439 | struct ib_uverbs_event_file *file = filp->private_data; | |
6b73597e | 440 | struct ib_uverbs_event *entry, *tmp; |
036b1063 | 441 | int closed_already = 0; |
6b73597e | 442 | |
036b1063 | 443 | mutex_lock(&file->uverbs_file->device->lists_mutex); |
6b73597e | 444 | spin_lock_irq(&file->lock); |
036b1063 | 445 | closed_already = file->is_closed; |
1ae5c187 | 446 | file->is_closed = 1; |
6b73597e RD |
447 | list_for_each_entry_safe(entry, tmp, &file->event_list, list) { |
448 | if (entry->counter) | |
449 | list_del(&entry->obj_list); | |
450 | kfree(entry); | |
451 | } | |
452 | spin_unlock_irq(&file->lock); | |
036b1063 YH |
453 | if (!closed_already) { |
454 | list_del(&file->list); | |
455 | if (file->is_async) | |
456 | ib_unregister_event_handler(&file->uverbs_file-> | |
457 | event_handler); | |
458 | } | |
459 | mutex_unlock(&file->uverbs_file->device->lists_mutex); | |
bc38a6ab | 460 | |
03c40442 | 461 | kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); |
6b73597e | 462 | kref_put(&file->ref, ib_uverbs_release_event_file); |
bc38a6ab RD |
463 | |
464 | return 0; | |
465 | } | |
466 | ||
2b8693c0 | 467 | static const struct file_operations uverbs_event_fops = { |
6b73597e | 468 | .owner = THIS_MODULE, |
9afed76d | 469 | .read = ib_uverbs_event_read, |
bc38a6ab | 470 | .poll = ib_uverbs_event_poll, |
abdf119b | 471 | .release = ib_uverbs_event_close, |
bc1db9af RD |
472 | .fasync = ib_uverbs_event_fasync, |
473 | .llseek = no_llseek, | |
bc38a6ab RD |
474 | }; |
475 | ||
476 | void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) | |
477 | { | |
6b73597e RD |
478 | struct ib_uverbs_event_file *file = cq_context; |
479 | struct ib_ucq_object *uobj; | |
480 | struct ib_uverbs_event *entry; | |
481 | unsigned long flags; | |
482 | ||
483 | if (!file) | |
484 | return; | |
485 | ||
486 | spin_lock_irqsave(&file->lock, flags); | |
1ae5c187 | 487 | if (file->is_closed) { |
6b73597e RD |
488 | spin_unlock_irqrestore(&file->lock, flags); |
489 | return; | |
490 | } | |
bc38a6ab RD |
491 | |
492 | entry = kmalloc(sizeof *entry, GFP_ATOMIC); | |
305a7e87 RD |
493 | if (!entry) { |
494 | spin_unlock_irqrestore(&file->lock, flags); | |
bc38a6ab | 495 | return; |
305a7e87 | 496 | } |
bc38a6ab | 497 | |
63aaf647 RD |
498 | uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); |
499 | ||
500 | entry->desc.comp.cq_handle = cq->uobject->user_handle; | |
501 | entry->counter = &uobj->comp_events_reported; | |
bc38a6ab | 502 | |
6b73597e | 503 | list_add_tail(&entry->list, &file->event_list); |
63aaf647 | 504 | list_add_tail(&entry->obj_list, &uobj->comp_list); |
6b73597e | 505 | spin_unlock_irqrestore(&file->lock, flags); |
bc38a6ab | 506 | |
6b73597e RD |
507 | wake_up_interruptible(&file->poll_wait); |
508 | kill_fasync(&file->async_queue, SIGIO, POLL_IN); | |
bc38a6ab RD |
509 | } |
510 | ||
511 | static void ib_uverbs_async_handler(struct ib_uverbs_file *file, | |
63aaf647 RD |
512 | __u64 element, __u64 event, |
513 | struct list_head *obj_list, | |
514 | u32 *counter) | |
bc38a6ab | 515 | { |
63aaf647 | 516 | struct ib_uverbs_event *entry; |
bc38a6ab RD |
517 | unsigned long flags; |
518 | ||
6b73597e | 519 | spin_lock_irqsave(&file->async_file->lock, flags); |
fb77bcef | 520 | if (file->async_file->is_closed) { |
6b73597e RD |
521 | spin_unlock_irqrestore(&file->async_file->lock, flags); |
522 | return; | |
523 | } | |
524 | ||
bc38a6ab | 525 | entry = kmalloc(sizeof *entry, GFP_ATOMIC); |
305a7e87 RD |
526 | if (!entry) { |
527 | spin_unlock_irqrestore(&file->async_file->lock, flags); | |
bc38a6ab | 528 | return; |
305a7e87 | 529 | } |
bc38a6ab | 530 | |
63aaf647 RD |
531 | entry->desc.async.element = element; |
532 | entry->desc.async.event_type = event; | |
377b5134 | 533 | entry->desc.async.reserved = 0; |
63aaf647 | 534 | entry->counter = counter; |
bc38a6ab | 535 | |
6b73597e | 536 | list_add_tail(&entry->list, &file->async_file->event_list); |
63aaf647 RD |
537 | if (obj_list) |
538 | list_add_tail(&entry->obj_list, obj_list); | |
6b73597e | 539 | spin_unlock_irqrestore(&file->async_file->lock, flags); |
bc38a6ab | 540 | |
6b73597e RD |
541 | wake_up_interruptible(&file->async_file->poll_wait); |
542 | kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); | |
bc38a6ab RD |
543 | } |
544 | ||
545 | void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) | |
546 | { | |
7162a3e0 RD |
547 | struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, |
548 | struct ib_ucq_object, uobject); | |
63aaf647 | 549 | |
7162a3e0 | 550 | ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, |
63aaf647 RD |
551 | event->event, &uobj->async_list, |
552 | &uobj->async_events_reported); | |
bc38a6ab RD |
553 | } |
554 | ||
555 | void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) | |
556 | { | |
63aaf647 RD |
557 | struct ib_uevent_object *uobj; |
558 | ||
a040f95d JM |
559 | /* for XRC target qp's, check that qp is live */ |
560 | if (!event->element.qp->uobject || !event->element.qp->uobject->live) | |
561 | return; | |
562 | ||
63aaf647 RD |
563 | uobj = container_of(event->element.qp->uobject, |
564 | struct ib_uevent_object, uobject); | |
565 | ||
566 | ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, | |
567 | event->event, &uobj->event_list, | |
568 | &uobj->events_reported); | |
bc38a6ab RD |
569 | } |
570 | ||
f520ba5a RD |
571 | void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) |
572 | { | |
63aaf647 RD |
573 | struct ib_uevent_object *uobj; |
574 | ||
575 | uobj = container_of(event->element.srq->uobject, | |
576 | struct ib_uevent_object, uobject); | |
577 | ||
578 | ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, | |
579 | event->event, &uobj->event_list, | |
580 | &uobj->events_reported); | |
f520ba5a RD |
581 | } |
582 | ||
6b73597e RD |
583 | void ib_uverbs_event_handler(struct ib_event_handler *handler, |
584 | struct ib_event *event) | |
bc38a6ab RD |
585 | { |
586 | struct ib_uverbs_file *file = | |
587 | container_of(handler, struct ib_uverbs_file, event_handler); | |
588 | ||
63aaf647 RD |
589 | ib_uverbs_async_handler(file, event->element.port_num, event->event, |
590 | NULL, NULL); | |
bc38a6ab RD |
591 | } |
592 | ||
03c40442 YH |
593 | void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file) |
594 | { | |
595 | kref_put(&file->async_file->ref, ib_uverbs_release_event_file); | |
596 | file->async_file = NULL; | |
597 | } | |
598 | ||
6b73597e | 599 | struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, |
057aec0d | 600 | struct ib_device *ib_dev, |
b1e4594b | 601 | int is_async) |
bc38a6ab | 602 | { |
6b73597e | 603 | struct ib_uverbs_event_file *ev_file; |
bc38a6ab | 604 | struct file *filp; |
03c40442 | 605 | int ret; |
bc38a6ab | 606 | |
03c40442 | 607 | ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL); |
6b73597e RD |
608 | if (!ev_file) |
609 | return ERR_PTR(-ENOMEM); | |
610 | ||
611 | kref_init(&ev_file->ref); | |
612 | spin_lock_init(&ev_file->lock); | |
613 | INIT_LIST_HEAD(&ev_file->event_list); | |
614 | init_waitqueue_head(&ev_file->poll_wait); | |
615 | ev_file->uverbs_file = uverbs_file; | |
03c40442 | 616 | kref_get(&ev_file->uverbs_file->ref); |
6b73597e | 617 | ev_file->async_queue = NULL; |
1ae5c187 | 618 | ev_file->is_closed = 0; |
6b73597e | 619 | |
b1e4594b | 620 | filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops, |
a265e558 | 621 | ev_file, O_RDONLY); |
b1e4594b | 622 | if (IS_ERR(filp)) |
03c40442 YH |
623 | goto err_put_refs; |
624 | ||
036b1063 YH |
625 | mutex_lock(&uverbs_file->device->lists_mutex); |
626 | list_add_tail(&ev_file->list, | |
627 | &uverbs_file->device->uverbs_events_file_list); | |
628 | mutex_unlock(&uverbs_file->device->lists_mutex); | |
629 | ||
03c40442 YH |
630 | if (is_async) { |
631 | WARN_ON(uverbs_file->async_file); | |
632 | uverbs_file->async_file = ev_file; | |
633 | kref_get(&uverbs_file->async_file->ref); | |
634 | INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler, | |
057aec0d | 635 | ib_dev, |
03c40442 YH |
636 | ib_uverbs_event_handler); |
637 | ret = ib_register_event_handler(&uverbs_file->event_handler); | |
638 | if (ret) | |
639 | goto err_put_file; | |
640 | ||
641 | /* At that point async file stuff was fully set */ | |
642 | ev_file->is_async = 1; | |
643 | } | |
644 | ||
645 | return filp; | |
646 | ||
647 | err_put_file: | |
648 | fput(filp); | |
649 | kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file); | |
650 | uverbs_file->async_file = NULL; | |
651 | return ERR_PTR(ret); | |
a7dab9e8 | 652 | |
03c40442 YH |
653 | err_put_refs: |
654 | kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file); | |
655 | kref_put(&ev_file->ref, ib_uverbs_release_event_file); | |
6b73597e | 656 | return filp; |
6b73597e RD |
657 | } |
658 | ||
659 | /* | |
660 | * Look up a completion event file by FD. If lookup is successful, | |
661 | * takes a ref to the event file struct that it returns; if | |
662 | * unsuccessful, returns NULL. | |
663 | */ | |
664 | struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) | |
665 | { | |
666 | struct ib_uverbs_event_file *ev_file = NULL; | |
2903ff01 | 667 | struct fd f = fdget(fd); |
6b73597e | 668 | |
2903ff01 | 669 | if (!f.file) |
6b73597e RD |
670 | return NULL; |
671 | ||
2903ff01 | 672 | if (f.file->f_op != &uverbs_event_fops) |
6b73597e RD |
673 | goto out; |
674 | ||
2903ff01 | 675 | ev_file = f.file->private_data; |
6b73597e RD |
676 | if (ev_file->is_async) { |
677 | ev_file = NULL; | |
678 | goto out; | |
679 | } | |
680 | ||
681 | kref_get(&ev_file->ref); | |
682 | ||
683 | out: | |
2903ff01 | 684 | fdput(f); |
6b73597e | 685 | return ev_file; |
bc38a6ab RD |
686 | } |
687 | ||
2dbd5186 EC |
688 | static int verify_command_mask(struct ib_device *ib_dev, __u32 command) |
689 | { | |
690 | u64 mask; | |
691 | ||
692 | if (command <= IB_USER_VERBS_CMD_OPEN_QP) | |
693 | mask = ib_dev->uverbs_cmd_mask; | |
694 | else | |
695 | mask = ib_dev->uverbs_ex_cmd_mask; | |
696 | ||
697 | if (mask & ((u64)1 << command)) | |
698 | return 0; | |
699 | ||
700 | return -1; | |
701 | } | |
702 | ||
bc38a6ab RD |
703 | static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, |
704 | size_t count, loff_t *pos) | |
705 | { | |
706 | struct ib_uverbs_file *file = filp->private_data; | |
036b1063 | 707 | struct ib_device *ib_dev; |
bc38a6ab | 708 | struct ib_uverbs_cmd_hdr hdr; |
74a0b0a5 | 709 | __u32 command; |
f21519b2 | 710 | __u32 flags; |
036b1063 YH |
711 | int srcu_key; |
712 | ssize_t ret; | |
057aec0d | 713 | |
e6bd18f5 JG |
714 | if (WARN_ON_ONCE(!ib_safe_file_access(filp))) |
715 | return -EACCES; | |
716 | ||
bc38a6ab RD |
717 | if (count < sizeof hdr) |
718 | return -EINVAL; | |
719 | ||
720 | if (copy_from_user(&hdr, buf, sizeof hdr)) | |
721 | return -EFAULT; | |
722 | ||
036b1063 YH |
723 | srcu_key = srcu_read_lock(&file->device->disassociate_srcu); |
724 | ib_dev = srcu_dereference(file->device->ib_dev, | |
725 | &file->device->disassociate_srcu); | |
726 | if (!ib_dev) { | |
727 | ret = -EIO; | |
728 | goto out; | |
729 | } | |
730 | ||
74a0b0a5 EC |
731 | if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK | |
732 | IB_USER_VERBS_CMD_COMMAND_MASK)) { | |
733 | ret = -EINVAL; | |
734 | goto out; | |
735 | } | |
736 | ||
737 | command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK; | |
2dbd5186 EC |
738 | if (verify_command_mask(ib_dev, command)) { |
739 | ret = -EOPNOTSUPP; | |
740 | goto out; | |
741 | } | |
74a0b0a5 | 742 | |
eaebc7d2 EC |
743 | if (!file->ucontext && |
744 | command != IB_USER_VERBS_CMD_GET_CONTEXT) { | |
745 | ret = -EINVAL; | |
746 | goto out; | |
747 | } | |
748 | ||
f21519b2 YD |
749 | flags = (hdr.command & |
750 | IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT; | |
bc38a6ab | 751 | |
f21519b2 | 752 | if (!flags) { |
f21519b2 | 753 | if (command >= ARRAY_SIZE(uverbs_cmd_table) || |
036b1063 YH |
754 | !uverbs_cmd_table[command]) { |
755 | ret = -EINVAL; | |
756 | goto out; | |
757 | } | |
400dbc96 | 758 | |
036b1063 YH |
759 | if (hdr.in_words * 4 != count) { |
760 | ret = -EINVAL; | |
761 | goto out; | |
762 | } | |
400dbc96 | 763 | |
036b1063 | 764 | ret = uverbs_cmd_table[command](file, ib_dev, |
f21519b2 YD |
765 | buf + sizeof(hdr), |
766 | hdr.in_words * 4, | |
767 | hdr.out_words * 4); | |
768 | ||
f21519b2 | 769 | } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) { |
f21519b2 YD |
770 | struct ib_uverbs_ex_cmd_hdr ex_hdr; |
771 | struct ib_udata ucore; | |
772 | struct ib_udata uhw; | |
f21519b2 YD |
773 | size_t written_count = count; |
774 | ||
f21519b2 | 775 | if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) || |
036b1063 YH |
776 | !uverbs_ex_cmd_table[command]) { |
777 | ret = -ENOSYS; | |
778 | goto out; | |
779 | } | |
f21519b2 | 780 | |
036b1063 YH |
781 | if (!file->ucontext) { |
782 | ret = -EINVAL; | |
783 | goto out; | |
784 | } | |
f21519b2 | 785 | |
036b1063 YH |
786 | if (count < (sizeof(hdr) + sizeof(ex_hdr))) { |
787 | ret = -EINVAL; | |
788 | goto out; | |
789 | } | |
f21519b2 | 790 | |
036b1063 YH |
791 | if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) { |
792 | ret = -EFAULT; | |
793 | goto out; | |
794 | } | |
f21519b2 YD |
795 | |
796 | count -= sizeof(hdr) + sizeof(ex_hdr); | |
797 | buf += sizeof(hdr) + sizeof(ex_hdr); | |
798 | ||
036b1063 YH |
799 | if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) { |
800 | ret = -EINVAL; | |
801 | goto out; | |
802 | } | |
f21519b2 | 803 | |
036b1063 YH |
804 | if (ex_hdr.cmd_hdr_reserved) { |
805 | ret = -EINVAL; | |
806 | goto out; | |
807 | } | |
7efb1b19 | 808 | |
f21519b2 | 809 | if (ex_hdr.response) { |
036b1063 YH |
810 | if (!hdr.out_words && !ex_hdr.provider_out_words) { |
811 | ret = -EINVAL; | |
812 | goto out; | |
813 | } | |
6cc3df84 YD |
814 | |
815 | if (!access_ok(VERIFY_WRITE, | |
816 | (void __user *) (unsigned long) ex_hdr.response, | |
036b1063 YH |
817 | (hdr.out_words + ex_hdr.provider_out_words) * 8)) { |
818 | ret = -EFAULT; | |
819 | goto out; | |
820 | } | |
f21519b2 | 821 | } else { |
036b1063 YH |
822 | if (hdr.out_words || ex_hdr.provider_out_words) { |
823 | ret = -EINVAL; | |
824 | goto out; | |
825 | } | |
f21519b2 YD |
826 | } |
827 | ||
a96e4e2f RD |
828 | INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response, |
829 | hdr.in_words * 8, hdr.out_words * 8); | |
830 | ||
831 | INIT_UDATA_BUF_OR_NULL(&uhw, | |
832 | buf + ucore.inlen, | |
833 | (unsigned long) ex_hdr.response + ucore.outlen, | |
834 | ex_hdr.provider_in_words * 8, | |
835 | ex_hdr.provider_out_words * 8); | |
f21519b2 | 836 | |
036b1063 | 837 | ret = uverbs_ex_cmd_table[command](file, |
057aec0d | 838 | ib_dev, |
f21519b2 YD |
839 | &ucore, |
840 | &uhw); | |
036b1063 YH |
841 | if (!ret) |
842 | ret = written_count; | |
843 | } else { | |
844 | ret = -ENOSYS; | |
400dbc96 | 845 | } |
f21519b2 | 846 | |
036b1063 YH |
847 | out: |
848 | srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); | |
849 | return ret; | |
bc38a6ab RD |
850 | } |
851 | ||
852 | static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) | |
853 | { | |
854 | struct ib_uverbs_file *file = filp->private_data; | |
036b1063 YH |
855 | struct ib_device *ib_dev; |
856 | int ret = 0; | |
857 | int srcu_key; | |
bc38a6ab | 858 | |
036b1063 YH |
859 | srcu_key = srcu_read_lock(&file->device->disassociate_srcu); |
860 | ib_dev = srcu_dereference(file->device->ib_dev, | |
861 | &file->device->disassociate_srcu); | |
862 | if (!ib_dev) { | |
863 | ret = -EIO; | |
864 | goto out; | |
865 | } | |
866 | ||
867 | if (!file->ucontext) | |
868 | ret = -ENODEV; | |
bc38a6ab | 869 | else |
036b1063 YH |
870 | ret = ib_dev->mmap(file->ucontext, vma); |
871 | out: | |
872 | srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); | |
873 | return ret; | |
bc38a6ab RD |
874 | } |
875 | ||
5b2d281a RD |
876 | /* |
877 | * ib_uverbs_open() does not need the BKL: | |
878 | * | |
2a72f212 | 879 | * - the ib_uverbs_device structures are properly reference counted and |
5b2d281a RD |
880 | * everything else is purely local to the file being created, so |
881 | * races against other open calls are not a problem; | |
882 | * - there is no ioctl method to race against; | |
2a72f212 AC |
883 | * - the open method will either immediately run -ENXIO, or all |
884 | * required initialization will be done. | |
5b2d281a | 885 | */ |
bc38a6ab RD |
886 | static int ib_uverbs_open(struct inode *inode, struct file *filp) |
887 | { | |
70a30e16 | 888 | struct ib_uverbs_device *dev; |
bc38a6ab | 889 | struct ib_uverbs_file *file; |
036b1063 | 890 | struct ib_device *ib_dev; |
70a30e16 | 891 | int ret; |
036b1063 YH |
892 | int module_dependent; |
893 | int srcu_key; | |
bc38a6ab | 894 | |
2a72f212 | 895 | dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); |
35d4a0b6 | 896 | if (!atomic_inc_not_zero(&dev->refcount)) |
70a30e16 RD |
897 | return -ENXIO; |
898 | ||
036b1063 YH |
899 | srcu_key = srcu_read_lock(&dev->disassociate_srcu); |
900 | mutex_lock(&dev->lists_mutex); | |
901 | ib_dev = srcu_dereference(dev->ib_dev, | |
902 | &dev->disassociate_srcu); | |
903 | if (!ib_dev) { | |
904 | ret = -EIO; | |
70a30e16 RD |
905 | goto err; |
906 | } | |
bc38a6ab | 907 | |
036b1063 YH |
908 | /* In case IB device supports disassociate ucontext, there is no hard |
909 | * dependency between uverbs device and its low level device. | |
910 | */ | |
911 | module_dependent = !(ib_dev->disassociate_ucontext); | |
912 | ||
913 | if (module_dependent) { | |
914 | if (!try_module_get(ib_dev->owner)) { | |
915 | ret = -ENODEV; | |
916 | goto err; | |
917 | } | |
918 | } | |
919 | ||
920 | file = kzalloc(sizeof(*file), GFP_KERNEL); | |
63c47c28 | 921 | if (!file) { |
70a30e16 | 922 | ret = -ENOMEM; |
036b1063 YH |
923 | if (module_dependent) |
924 | goto err_module; | |
925 | ||
926 | goto err; | |
63c47c28 | 927 | } |
bc38a6ab | 928 | |
70a30e16 RD |
929 | file->device = dev; |
930 | file->ucontext = NULL; | |
931 | file->async_file = NULL; | |
bc38a6ab | 932 | kref_init(&file->ref); |
95ed644f | 933 | mutex_init(&file->mutex); |
bc38a6ab | 934 | |
bc38a6ab | 935 | filp->private_data = file; |
35d4a0b6 | 936 | kobject_get(&dev->kobj); |
036b1063 YH |
937 | list_add_tail(&file->list, &dev->uverbs_file_list); |
938 | mutex_unlock(&dev->lists_mutex); | |
939 | srcu_read_unlock(&dev->disassociate_srcu, srcu_key); | |
bc38a6ab | 940 | |
bc1db9af | 941 | return nonseekable_open(inode, filp); |
70a30e16 RD |
942 | |
943 | err_module: | |
036b1063 | 944 | module_put(ib_dev->owner); |
70a30e16 RD |
945 | |
946 | err: | |
036b1063 YH |
947 | mutex_unlock(&dev->lists_mutex); |
948 | srcu_read_unlock(&dev->disassociate_srcu, srcu_key); | |
35d4a0b6 YH |
949 | if (atomic_dec_and_test(&dev->refcount)) |
950 | ib_uverbs_comp_dev(dev); | |
951 | ||
70a30e16 | 952 | return ret; |
bc38a6ab RD |
953 | } |
954 | ||
955 | static int ib_uverbs_close(struct inode *inode, struct file *filp) | |
956 | { | |
957 | struct ib_uverbs_file *file = filp->private_data; | |
35d4a0b6 | 958 | struct ib_uverbs_device *dev = file->device; |
036b1063 YH |
959 | struct ib_ucontext *ucontext = NULL; |
960 | ||
961 | mutex_lock(&file->device->lists_mutex); | |
962 | ucontext = file->ucontext; | |
963 | file->ucontext = NULL; | |
964 | if (!file->is_closed) { | |
965 | list_del(&file->list); | |
966 | file->is_closed = 1; | |
967 | } | |
968 | mutex_unlock(&file->device->lists_mutex); | |
969 | if (ucontext) | |
970 | ib_uverbs_cleanup_ucontext(file, ucontext); | |
70a30e16 RD |
971 | |
972 | if (file->async_file) | |
973 | kref_put(&file->async_file->ref, ib_uverbs_release_event_file); | |
bc38a6ab | 974 | |
bc38a6ab | 975 | kref_put(&file->ref, ib_uverbs_release_file); |
35d4a0b6 | 976 | kobject_put(&dev->kobj); |
bc38a6ab RD |
977 | |
978 | return 0; | |
979 | } | |
980 | ||
2b8693c0 | 981 | static const struct file_operations uverbs_fops = { |
9afed76d AC |
982 | .owner = THIS_MODULE, |
983 | .write = ib_uverbs_write, | |
984 | .open = ib_uverbs_open, | |
bc1db9af RD |
985 | .release = ib_uverbs_close, |
986 | .llseek = no_llseek, | |
bc38a6ab RD |
987 | }; |
988 | ||
2b8693c0 | 989 | static const struct file_operations uverbs_mmap_fops = { |
9afed76d AC |
990 | .owner = THIS_MODULE, |
991 | .write = ib_uverbs_write, | |
bc38a6ab | 992 | .mmap = ib_uverbs_mmap, |
9afed76d | 993 | .open = ib_uverbs_open, |
bc1db9af RD |
994 | .release = ib_uverbs_close, |
995 | .llseek = no_llseek, | |
bc38a6ab RD |
996 | }; |
997 | ||
998 | static struct ib_client uverbs_client = { | |
999 | .name = "uverbs", | |
1000 | .add = ib_uverbs_add_one, | |
1001 | .remove = ib_uverbs_remove_one | |
1002 | }; | |
1003 | ||
f4e91eb4 TJ |
1004 | static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, |
1005 | char *buf) | |
bc38a6ab | 1006 | { |
036b1063 YH |
1007 | int ret = -ENODEV; |
1008 | int srcu_key; | |
f4e91eb4 | 1009 | struct ib_uverbs_device *dev = dev_get_drvdata(device); |
036b1063 | 1010 | struct ib_device *ib_dev; |
70a30e16 RD |
1011 | |
1012 | if (!dev) | |
1013 | return -ENODEV; | |
bc38a6ab | 1014 | |
036b1063 YH |
1015 | srcu_key = srcu_read_lock(&dev->disassociate_srcu); |
1016 | ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); | |
1017 | if (ib_dev) | |
1018 | ret = sprintf(buf, "%s\n", ib_dev->name); | |
1019 | srcu_read_unlock(&dev->disassociate_srcu, srcu_key); | |
1020 | ||
1021 | return ret; | |
bc38a6ab | 1022 | } |
f4e91eb4 | 1023 | static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); |
bc38a6ab | 1024 | |
f4e91eb4 TJ |
1025 | static ssize_t show_dev_abi_version(struct device *device, |
1026 | struct device_attribute *attr, char *buf) | |
274c0891 | 1027 | { |
f4e91eb4 | 1028 | struct ib_uverbs_device *dev = dev_get_drvdata(device); |
036b1063 YH |
1029 | int ret = -ENODEV; |
1030 | int srcu_key; | |
1031 | struct ib_device *ib_dev; | |
70a30e16 RD |
1032 | |
1033 | if (!dev) | |
1034 | return -ENODEV; | |
036b1063 YH |
1035 | srcu_key = srcu_read_lock(&dev->disassociate_srcu); |
1036 | ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); | |
1037 | if (ib_dev) | |
1038 | ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver); | |
1039 | srcu_read_unlock(&dev->disassociate_srcu, srcu_key); | |
274c0891 | 1040 | |
036b1063 | 1041 | return ret; |
274c0891 | 1042 | } |
f4e91eb4 | 1043 | static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); |
274c0891 | 1044 | |
0933e2d9 AK |
1045 | static CLASS_ATTR_STRING(abi_version, S_IRUGO, |
1046 | __stringify(IB_USER_VERBS_ABI_VERSION)); | |
bc38a6ab | 1047 | |
6d6a0e71 AC |
1048 | static dev_t overflow_maj; |
1049 | static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES); | |
1050 | ||
1051 | /* | |
1052 | * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by | |
1053 | * requesting a new major number and doubling the number of max devices we | |
1054 | * support. It's stupid, but simple. | |
1055 | */ | |
1056 | static int find_overflow_devnum(void) | |
1057 | { | |
1058 | int ret; | |
1059 | ||
1060 | if (!overflow_maj) { | |
1061 | ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES, | |
1062 | "infiniband_verbs"); | |
1063 | if (ret) { | |
aba25a3e | 1064 | pr_err("user_verbs: couldn't register dynamic device number\n"); |
6d6a0e71 AC |
1065 | return ret; |
1066 | } | |
1067 | } | |
1068 | ||
1069 | ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES); | |
1070 | if (ret >= IB_UVERBS_MAX_DEVICES) | |
1071 | return -1; | |
1072 | ||
1073 | return ret; | |
1074 | } | |
1075 | ||
bc38a6ab RD |
1076 | static void ib_uverbs_add_one(struct ib_device *device) |
1077 | { | |
38707980 | 1078 | int devnum; |
ddbd6883 | 1079 | dev_t base; |
bc38a6ab | 1080 | struct ib_uverbs_device *uverbs_dev; |
036b1063 | 1081 | int ret; |
bc38a6ab RD |
1082 | |
1083 | if (!device->alloc_ucontext) | |
1084 | return; | |
1085 | ||
de6eb66b | 1086 | uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); |
bc38a6ab RD |
1087 | if (!uverbs_dev) |
1088 | return; | |
1089 | ||
036b1063 YH |
1090 | ret = init_srcu_struct(&uverbs_dev->disassociate_srcu); |
1091 | if (ret) { | |
1092 | kfree(uverbs_dev); | |
1093 | return; | |
1094 | } | |
1095 | ||
35d4a0b6 | 1096 | atomic_set(&uverbs_dev->refcount, 1); |
fd60ae40 | 1097 | init_completion(&uverbs_dev->comp); |
53d0bd1e SH |
1098 | uverbs_dev->xrcd_tree = RB_ROOT; |
1099 | mutex_init(&uverbs_dev->xrcd_tree_mutex); | |
35d4a0b6 | 1100 | kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype); |
036b1063 YH |
1101 | mutex_init(&uverbs_dev->lists_mutex); |
1102 | INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list); | |
1103 | INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list); | |
70a30e16 | 1104 | |
bc38a6ab | 1105 | spin_lock(&map_lock); |
38707980 AC |
1106 | devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); |
1107 | if (devnum >= IB_UVERBS_MAX_DEVICES) { | |
bc38a6ab | 1108 | spin_unlock(&map_lock); |
6d6a0e71 AC |
1109 | devnum = find_overflow_devnum(); |
1110 | if (devnum < 0) | |
1111 | goto err; | |
1112 | ||
1113 | spin_lock(&map_lock); | |
1114 | uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES; | |
1115 | base = devnum + overflow_maj; | |
1116 | set_bit(devnum, overflow_map); | |
1117 | } else { | |
1118 | uverbs_dev->devnum = devnum; | |
1119 | base = devnum + IB_UVERBS_BASE_DEV; | |
1120 | set_bit(devnum, dev_map); | |
bc38a6ab | 1121 | } |
bc38a6ab RD |
1122 | spin_unlock(&map_lock); |
1123 | ||
036b1063 | 1124 | rcu_assign_pointer(uverbs_dev->ib_dev, device); |
f4fd0b22 | 1125 | uverbs_dev->num_comp_vectors = device->num_comp_vectors; |
bc38a6ab | 1126 | |
055422dd AC |
1127 | cdev_init(&uverbs_dev->cdev, NULL); |
1128 | uverbs_dev->cdev.owner = THIS_MODULE; | |
1129 | uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; | |
35d4a0b6 | 1130 | uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj; |
055422dd | 1131 | kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); |
ddbd6883 | 1132 | if (cdev_add(&uverbs_dev->cdev, base, 1)) |
70a30e16 | 1133 | goto err_cdev; |
bc38a6ab | 1134 | |
91bd418f | 1135 | uverbs_dev->dev = device_create(uverbs_class, device->dma_device, |
055422dd | 1136 | uverbs_dev->cdev.dev, uverbs_dev, |
91bd418f | 1137 | "uverbs%d", uverbs_dev->devnum); |
f4e91eb4 | 1138 | if (IS_ERR(uverbs_dev->dev)) |
bc38a6ab RD |
1139 | goto err_cdev; |
1140 | ||
f4e91eb4 | 1141 | if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) |
bc38a6ab | 1142 | goto err_class; |
f4e91eb4 | 1143 | if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) |
274c0891 | 1144 | goto err_class; |
bc38a6ab RD |
1145 | |
1146 | ib_set_client_data(device, &uverbs_client, uverbs_dev); | |
1147 | ||
1148 | return; | |
1149 | ||
1150 | err_class: | |
055422dd | 1151 | device_destroy(uverbs_class, uverbs_dev->cdev.dev); |
bc38a6ab RD |
1152 | |
1153 | err_cdev: | |
055422dd | 1154 | cdev_del(&uverbs_dev->cdev); |
6d6a0e71 AC |
1155 | if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) |
1156 | clear_bit(devnum, dev_map); | |
1157 | else | |
1158 | clear_bit(devnum, overflow_map); | |
bc38a6ab RD |
1159 | |
1160 | err: | |
35d4a0b6 YH |
1161 | if (atomic_dec_and_test(&uverbs_dev->refcount)) |
1162 | ib_uverbs_comp_dev(uverbs_dev); | |
fd60ae40 | 1163 | wait_for_completion(&uverbs_dev->comp); |
35d4a0b6 | 1164 | kobject_put(&uverbs_dev->kobj); |
bc38a6ab RD |
1165 | return; |
1166 | } | |
1167 | ||
036b1063 YH |
1168 | static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev, |
1169 | struct ib_device *ib_dev) | |
1170 | { | |
1171 | struct ib_uverbs_file *file; | |
1172 | struct ib_uverbs_event_file *event_file; | |
1173 | struct ib_event event; | |
1174 | ||
1175 | /* Pending running commands to terminate */ | |
1176 | synchronize_srcu(&uverbs_dev->disassociate_srcu); | |
1177 | event.event = IB_EVENT_DEVICE_FATAL; | |
1178 | event.element.port_num = 0; | |
1179 | event.device = ib_dev; | |
1180 | ||
1181 | mutex_lock(&uverbs_dev->lists_mutex); | |
1182 | while (!list_empty(&uverbs_dev->uverbs_file_list)) { | |
1183 | struct ib_ucontext *ucontext; | |
1184 | ||
1185 | file = list_first_entry(&uverbs_dev->uverbs_file_list, | |
1186 | struct ib_uverbs_file, list); | |
1187 | file->is_closed = 1; | |
1188 | ucontext = file->ucontext; | |
1189 | list_del(&file->list); | |
1190 | file->ucontext = NULL; | |
1191 | kref_get(&file->ref); | |
1192 | mutex_unlock(&uverbs_dev->lists_mutex); | |
1193 | /* We must release the mutex before going ahead and calling | |
1194 | * disassociate_ucontext. disassociate_ucontext might end up | |
1195 | * indirectly calling uverbs_close, for example due to freeing | |
1196 | * the resources (e.g mmput). | |
1197 | */ | |
1198 | ib_uverbs_event_handler(&file->event_handler, &event); | |
1199 | if (ucontext) { | |
1200 | ib_dev->disassociate_ucontext(ucontext); | |
1201 | ib_uverbs_cleanup_ucontext(file, ucontext); | |
1202 | } | |
1203 | ||
1204 | mutex_lock(&uverbs_dev->lists_mutex); | |
1205 | kref_put(&file->ref, ib_uverbs_release_file); | |
1206 | } | |
1207 | ||
1208 | while (!list_empty(&uverbs_dev->uverbs_events_file_list)) { | |
1209 | event_file = list_first_entry(&uverbs_dev-> | |
1210 | uverbs_events_file_list, | |
1211 | struct ib_uverbs_event_file, | |
1212 | list); | |
1213 | spin_lock_irq(&event_file->lock); | |
1214 | event_file->is_closed = 1; | |
1215 | spin_unlock_irq(&event_file->lock); | |
1216 | ||
1217 | list_del(&event_file->list); | |
1218 | if (event_file->is_async) { | |
1219 | ib_unregister_event_handler(&event_file->uverbs_file-> | |
1220 | event_handler); | |
1221 | event_file->uverbs_file->event_handler.device = NULL; | |
1222 | } | |
1223 | ||
1224 | wake_up_interruptible(&event_file->poll_wait); | |
1225 | kill_fasync(&event_file->async_queue, SIGIO, POLL_IN); | |
1226 | } | |
1227 | mutex_unlock(&uverbs_dev->lists_mutex); | |
1228 | } | |
1229 | ||
7c1eb45a | 1230 | static void ib_uverbs_remove_one(struct ib_device *device, void *client_data) |
bc38a6ab | 1231 | { |
7c1eb45a | 1232 | struct ib_uverbs_device *uverbs_dev = client_data; |
036b1063 | 1233 | int wait_clients = 1; |
bc38a6ab RD |
1234 | |
1235 | if (!uverbs_dev) | |
1236 | return; | |
1237 | ||
f4e91eb4 | 1238 | dev_set_drvdata(uverbs_dev->dev, NULL); |
055422dd AC |
1239 | device_destroy(uverbs_class, uverbs_dev->cdev.dev); |
1240 | cdev_del(&uverbs_dev->cdev); | |
70a30e16 | 1241 | |
6d6a0e71 AC |
1242 | if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) |
1243 | clear_bit(uverbs_dev->devnum, dev_map); | |
1244 | else | |
1245 | clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map); | |
fd60ae40 | 1246 | |
036b1063 YH |
1247 | if (device->disassociate_ucontext) { |
1248 | /* We disassociate HW resources and immediately return. | |
1249 | * Userspace will see a EIO errno for all future access. | |
1250 | * Upon returning, ib_device may be freed internally and is not | |
1251 | * valid any more. | |
1252 | * uverbs_device is still available until all clients close | |
1253 | * their files, then the uverbs device ref count will be zero | |
1254 | * and its resources will be freed. | |
1255 | * Note: At this point no more files can be opened since the | |
1256 | * cdev was deleted, however active clients can still issue | |
1257 | * commands and close their open files. | |
1258 | */ | |
1259 | rcu_assign_pointer(uverbs_dev->ib_dev, NULL); | |
1260 | ib_uverbs_free_hw_resources(uverbs_dev, device); | |
1261 | wait_clients = 0; | |
1262 | } | |
1263 | ||
35d4a0b6 YH |
1264 | if (atomic_dec_and_test(&uverbs_dev->refcount)) |
1265 | ib_uverbs_comp_dev(uverbs_dev); | |
036b1063 YH |
1266 | if (wait_clients) |
1267 | wait_for_completion(&uverbs_dev->comp); | |
35d4a0b6 | 1268 | kobject_put(&uverbs_dev->kobj); |
bc38a6ab RD |
1269 | } |
1270 | ||
2c9ede55 | 1271 | static char *uverbs_devnode(struct device *dev, umode_t *mode) |
71c29bd5 | 1272 | { |
b2bc4782 GR |
1273 | if (mode) |
1274 | *mode = 0666; | |
71c29bd5 RD |
1275 | return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); |
1276 | } | |
1277 | ||
bc38a6ab RD |
1278 | static int __init ib_uverbs_init(void) |
1279 | { | |
1280 | int ret; | |
1281 | ||
bc38a6ab RD |
1282 | ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, |
1283 | "infiniband_verbs"); | |
1284 | if (ret) { | |
aba25a3e | 1285 | pr_err("user_verbs: couldn't register device number\n"); |
bc38a6ab RD |
1286 | goto out; |
1287 | } | |
1288 | ||
70a30e16 RD |
1289 | uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); |
1290 | if (IS_ERR(uverbs_class)) { | |
1291 | ret = PTR_ERR(uverbs_class); | |
aba25a3e | 1292 | pr_err("user_verbs: couldn't create class infiniband_verbs\n"); |
bc38a6ab RD |
1293 | goto out_chrdev; |
1294 | } | |
1295 | ||
71c29bd5 RD |
1296 | uverbs_class->devnode = uverbs_devnode; |
1297 | ||
0933e2d9 | 1298 | ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); |
bc38a6ab | 1299 | if (ret) { |
aba25a3e | 1300 | pr_err("user_verbs: couldn't create abi_version attribute\n"); |
bc38a6ab RD |
1301 | goto out_class; |
1302 | } | |
1303 | ||
bc38a6ab RD |
1304 | ret = ib_register_client(&uverbs_client); |
1305 | if (ret) { | |
aba25a3e | 1306 | pr_err("user_verbs: couldn't register client\n"); |
a265e558 | 1307 | goto out_class; |
bc38a6ab RD |
1308 | } |
1309 | ||
1310 | return 0; | |
1311 | ||
bc38a6ab | 1312 | out_class: |
70a30e16 | 1313 | class_destroy(uverbs_class); |
bc38a6ab RD |
1314 | |
1315 | out_chrdev: | |
1316 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); | |
1317 | ||
1318 | out: | |
1319 | return ret; | |
1320 | } | |
1321 | ||
1322 | static void __exit ib_uverbs_cleanup(void) | |
1323 | { | |
1324 | ib_unregister_client(&uverbs_client); | |
70a30e16 | 1325 | class_destroy(uverbs_class); |
bc38a6ab | 1326 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); |
6d6a0e71 AC |
1327 | if (overflow_maj) |
1328 | unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES); | |
5d7edb3c RD |
1329 | idr_destroy(&ib_uverbs_pd_idr); |
1330 | idr_destroy(&ib_uverbs_mr_idr); | |
1331 | idr_destroy(&ib_uverbs_mw_idr); | |
1332 | idr_destroy(&ib_uverbs_ah_idr); | |
1333 | idr_destroy(&ib_uverbs_cq_idr); | |
1334 | idr_destroy(&ib_uverbs_qp_idr); | |
1335 | idr_destroy(&ib_uverbs_srq_idr); | |
bc38a6ab RD |
1336 | } |
1337 | ||
1338 | module_init(ib_uverbs_init); | |
1339 | module_exit(ib_uverbs_cleanup); |