Commit | Line | Data |
---|---|---|
3e7ee490 | 1 | /* |
3e7ee490 HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
3e7ee490 | 20 | */ |
0a46618d HJ |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
5654e932 | 23 | #include <linux/kernel.h> |
0c3b7b2f S |
24 | #include <linux/sched.h> |
25 | #include <linux/wait.h> | |
a0086dc5 | 26 | #include <linux/mm.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
c88c4e4c | 28 | #include <linux/module.h> |
46a97191 | 29 | #include <linux/hyperv.h> |
011a7c3c | 30 | #include <linux/uio.h> |
3f335ea2 | 31 | |
0f2a6619 | 32 | #include "hyperv_vmbus.h" |
3e7ee490 | 33 | |
e3fe0bb6 S |
34 | #define NUM_PAGES_SPANNED(addr, len) \ |
35 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) | |
36 | ||
3e189519 | 37 | /* |
fff41b2e | 38 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 39 | * channel. |
f4266e34 | 40 | */ |
fff41b2e | 41 | static void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 42 | { |
39d70a4a | 43 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 44 | |
c50f7fb2 | 45 | if (channel->offermsg.monitor_allocated) { |
454f18a9 | 46 | /* Each u32 represents 32 channels */ |
22356585 | 47 | sync_set_bit(channel->offermsg.child_relid & 31, |
da9fcb72 | 48 | (unsigned long *) vmbus_connection.send_int_page + |
c50f7fb2 | 49 | (channel->offermsg.child_relid >> 5)); |
3e7ee490 | 50 | |
8681db44 GKH |
51 | /* Get the child to parent monitor page */ |
52 | monitorpage = vmbus_connection.monitor_pages[1]; | |
3e7ee490 | 53 | |
22356585 | 54 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
55 | (unsigned long *)&monitorpage->trigger_group |
56 | [channel->monitor_grp].pending); | |
7c369f40 | 57 | |
f4266e34 | 58 | } else { |
21c3bef5 | 59 | vmbus_set_event(channel); |
3e7ee490 | 60 | } |
3e7ee490 HJ |
61 | } |
62 | ||
3e189519 | 63 | /* |
fff41b2e | 64 | * vmbus_open - Open the specified channel. |
f4266e34 | 65 | */ |
fff41b2e | 66 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
67 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
68 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 69 | { |
0987ff69 | 70 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 71 | struct vmbus_channel_msginfo *open_info = NULL; |
3e7ee490 | 72 | void *in, *out; |
dd0813b6 | 73 | unsigned long flags; |
9568a193 | 74 | int ret, t, err = 0; |
3e7ee490 | 75 | |
e68d2971 S |
76 | spin_lock_irqsave(&newchannel->sc_lock, flags); |
77 | if (newchannel->state == CHANNEL_OPEN_STATE) { | |
78 | newchannel->state = CHANNEL_OPENING_STATE; | |
79 | } else { | |
80 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
81 | return -EINVAL; | |
82 | } | |
83 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
84 | ||
c50f7fb2 HZ |
85 | newchannel->onchannel_callback = onchannelcallback; |
86 | newchannel->channel_callback_context = context; | |
3e7ee490 | 87 | |
454f18a9 | 88 | /* Allocate the ring buffer */ |
df3493e0 S |
89 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
90 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
91 | ||
7e052d98 BP |
92 | if (!out) |
93 | return -ENOMEM; | |
94 | ||
3e7ee490 | 95 | |
39d70a4a | 96 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 97 | |
c50f7fb2 HZ |
98 | newchannel->ringbuffer_pages = out; |
99 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 100 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 101 | |
72a95cbc S |
102 | ret = hv_ringbuffer_init( |
103 | &newchannel->outbound, out, send_ringbuffer_size); | |
104 | ||
fd4dc88e | 105 | if (ret != 0) { |
3324fb40 | 106 | err = ret; |
13925502 | 107 | goto error0; |
3324fb40 BP |
108 | } |
109 | ||
72a95cbc S |
110 | ret = hv_ringbuffer_init( |
111 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 112 | if (ret != 0) { |
3324fb40 | 113 | err = ret; |
13925502 | 114 | goto error0; |
3324fb40 | 115 | } |
3e7ee490 | 116 | |
3e7ee490 | 117 | |
454f18a9 | 118 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 119 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 120 | |
fff41b2e | 121 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 122 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
123 | send_ringbuffer_size + |
124 | recv_ringbuffer_size, | |
c50f7fb2 | 125 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 126 | |
fd4dc88e | 127 | if (ret != 0) { |
b94ef345 | 128 | err = ret; |
13925502 | 129 | goto error0; |
b94ef345 | 130 | } |
f4266e34 | 131 | |
454f18a9 | 132 | /* Create and init the channel open message */ |
176fb9e3 | 133 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
134 | sizeof(struct vmbus_channel_open_channel), |
135 | GFP_KERNEL); | |
176fb9e3 | 136 | if (!open_info) { |
c3bf2e26 | 137 | err = -ENOMEM; |
13925502 | 138 | goto error0; |
c3bf2e26 | 139 | } |
3e7ee490 | 140 | |
176fb9e3 | 141 | init_completion(&open_info->waitevent); |
3e7ee490 | 142 | |
176fb9e3 | 143 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
144 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
145 | open_msg->openid = newchannel->offermsg.child_relid; | |
146 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
147 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
148 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 149 | PAGE_SHIFT; |
abbf3b2a | 150 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 151 | |
39d70a4a | 152 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 153 | err = -EINVAL; |
13925502 | 154 | goto error0; |
c827f944 BP |
155 | } |
156 | ||
39d70a4a | 157 | if (userdatalen) |
0987ff69 | 158 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 159 | |
15b2f647 | 160 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 161 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 162 | &vmbus_connection.chn_msg_list); |
15b2f647 | 163 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 164 | |
0987ff69 | 165 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 166 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 HJ |
167 | |
168 | if (ret != 0) | |
13925502 | 169 | goto error1; |
3e7ee490 | 170 | |
176fb9e3 | 171 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
9568a193 | 172 | if (t == 0) { |
0c3b7b2f | 173 | err = -ETIMEDOUT; |
13925502 | 174 | goto error1; |
0c3b7b2f S |
175 | } |
176 | ||
3e7ee490 | 177 | |
176fb9e3 S |
178 | if (open_info->response.open_result.status) |
179 | err = open_info->response.open_result.status; | |
3e7ee490 | 180 | |
15b2f647 | 181 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 182 | list_del(&open_info->msglistentry); |
15b2f647 | 183 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 184 | |
e68d2971 S |
185 | if (err == 0) |
186 | newchannel->state = CHANNEL_OPENED_STATE; | |
187 | ||
176fb9e3 | 188 | kfree(open_info); |
98e08702 | 189 | return err; |
c3bf2e26 | 190 | |
13925502 S |
191 | error1: |
192 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
193 | list_del(&open_info->msglistentry); | |
194 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
195 | ||
196 | error0: | |
df3493e0 S |
197 | free_pages((unsigned long)out, |
198 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 199 | kfree(open_info); |
c3bf2e26 | 200 | return err; |
3e7ee490 | 201 | } |
36ceadfc | 202 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 203 | |
3e189519 | 204 | /* |
fff41b2e | 205 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 206 | */ |
fff41b2e | 207 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
208 | struct vmbus_channel_msginfo **msginfo, |
209 | u32 *messagecount) | |
3e7ee490 HJ |
210 | { |
211 | int i; | |
39d70a4a | 212 | int pagecount; |
39d70a4a HZ |
213 | struct vmbus_channel_gpadl_header *gpadl_header; |
214 | struct vmbus_channel_gpadl_body *gpadl_body; | |
215 | struct vmbus_channel_msginfo *msgheader; | |
216 | struct vmbus_channel_msginfo *msgbody = NULL; | |
217 | u32 msgsize; | |
3e7ee490 | 218 | |
39d70a4a | 219 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 220 | |
39d70a4a | 221 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 222 | |
454f18a9 | 223 | /* do we need a gpadl body msg */ |
39d70a4a | 224 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
225 | sizeof(struct vmbus_channel_gpadl_header) - |
226 | sizeof(struct gpa_range); | |
39d70a4a | 227 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 228 | |
39d70a4a | 229 | if (pagecount > pfncount) { |
f4266e34 | 230 | /* we need a gpadl body */ |
454f18a9 | 231 | /* fill in the header */ |
39d70a4a | 232 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 233 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
234 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
235 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
236 | if (!msgheader) | |
d1c250bb | 237 | goto nomem; |
3e7ee490 | 238 | |
c50f7fb2 HZ |
239 | INIT_LIST_HEAD(&msgheader->submsglist); |
240 | msgheader->msgsize = msgsize; | |
3e7ee490 | 241 | |
39d70a4a | 242 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
243 | msgheader->msg; |
244 | gpadl_header->rangecount = 1; | |
245 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 246 | pagecount * sizeof(u64); |
415f2287 HZ |
247 | gpadl_header->range[0].byte_offset = 0; |
248 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 249 | for (i = 0; i < pfncount; i++) |
b679ef73 HZ |
250 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
251 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
252 | *msginfo = msgheader; |
253 | *messagecount = 1; | |
3e7ee490 | 254 | |
39d70a4a HZ |
255 | pfnsum = pfncount; |
256 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 257 | |
454f18a9 | 258 | /* how many pfns can we fit */ |
39d70a4a | 259 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 260 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 261 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 262 | |
454f18a9 | 263 | /* fill in the body */ |
39d70a4a HZ |
264 | while (pfnleft) { |
265 | if (pfnleft > pfncount) | |
266 | pfncurr = pfncount; | |
3e7ee490 | 267 | else |
39d70a4a | 268 | pfncurr = pfnleft; |
3e7ee490 | 269 | |
39d70a4a | 270 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 271 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
272 | pfncurr * sizeof(u64); |
273 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
274 | |
275 | if (!msgbody) { | |
276 | struct vmbus_channel_msginfo *pos = NULL; | |
277 | struct vmbus_channel_msginfo *tmp = NULL; | |
278 | /* | |
279 | * Free up all the allocated messages. | |
280 | */ | |
281 | list_for_each_entry_safe(pos, tmp, | |
282 | &msgheader->submsglist, | |
283 | msglistentry) { | |
284 | ||
285 | list_del(&pos->msglistentry); | |
286 | kfree(pos); | |
287 | } | |
288 | ||
d1c250bb | 289 | goto nomem; |
f38cf9cc S |
290 | } |
291 | ||
c50f7fb2 | 292 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
293 | (*messagecount)++; |
294 | gpadl_body = | |
c50f7fb2 | 295 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
296 | |
297 | /* | |
f4266e34 GKH |
298 | * Gpadl is u32 and we are using a pointer which could |
299 | * be 64-bit | |
f27df643 S |
300 | * This is governed by the guest/host protocol and |
301 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 302 | */ |
39d70a4a | 303 | for (i = 0; i < pfncurr; i++) |
b679ef73 HZ |
304 | gpadl_body->pfn[i] = slow_virt_to_phys( |
305 | kbuffer + PAGE_SIZE * (pfnsum + i)) >> | |
306 | PAGE_SHIFT; | |
3e7ee490 | 307 | |
454f18a9 | 308 | /* add to msg header */ |
c50f7fb2 HZ |
309 | list_add_tail(&msgbody->msglistentry, |
310 | &msgheader->submsglist); | |
39d70a4a HZ |
311 | pfnsum += pfncurr; |
312 | pfnleft -= pfncurr; | |
3e7ee490 | 313 | } |
f4266e34 | 314 | } else { |
454f18a9 | 315 | /* everything fits in a header */ |
39d70a4a | 316 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 317 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
318 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
319 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
320 | if (msgheader == NULL) | |
e3eb7cdd | 321 | goto nomem; |
c50f7fb2 | 322 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
323 | |
324 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
325 | msgheader->msg; |
326 | gpadl_header->rangecount = 1; | |
327 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 328 | pagecount * sizeof(u64); |
415f2287 HZ |
329 | gpadl_header->range[0].byte_offset = 0; |
330 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 331 | for (i = 0; i < pagecount; i++) |
b679ef73 HZ |
332 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
333 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
334 | |
335 | *msginfo = msgheader; | |
336 | *messagecount = 1; | |
3e7ee490 HJ |
337 | } |
338 | ||
339 | return 0; | |
d1c250bb | 340 | nomem: |
39d70a4a HZ |
341 | kfree(msgheader); |
342 | kfree(msgbody); | |
d1c250bb | 343 | return -ENOMEM; |
3e7ee490 HJ |
344 | } |
345 | ||
3e189519 | 346 | /* |
fff41b2e | 347 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 348 | * |
39d70a4a | 349 | * @channel: a channel |
b679ef73 | 350 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
351 | * @size: page-size multiple |
352 | * @gpadl_handle: some funky thing | |
f4266e34 | 353 | */ |
fff41b2e | 354 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 355 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 356 | { |
39d70a4a HZ |
357 | struct vmbus_channel_gpadl_header *gpadlmsg; |
358 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
359 | struct vmbus_channel_msginfo *msginfo = NULL; |
360 | struct vmbus_channel_msginfo *submsginfo; | |
361 | u32 msgcount; | |
53af545b | 362 | struct list_head *curr; |
39d70a4a | 363 | u32 next_gpadl_handle; |
dd0813b6 | 364 | unsigned long flags; |
c3bf2e26 | 365 | int ret = 0; |
9568a193 | 366 | int t; |
3e7ee490 | 367 | |
da9fcb72 HZ |
368 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
369 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 370 | |
fff41b2e | 371 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
372 | if (ret) |
373 | return ret; | |
3e7ee490 | 374 | |
9568a193 | 375 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 376 | |
c50f7fb2 HZ |
377 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
378 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
379 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
380 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 381 | |
3e7ee490 | 382 | |
15b2f647 | 383 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 384 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 385 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 386 | |
15b2f647 | 387 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 388 | |
c6977677 | 389 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 390 | sizeof(*msginfo)); |
98e08702 | 391 | if (ret != 0) |
00d760b0 | 392 | goto cleanup; |
3e7ee490 | 393 | |
39d70a4a | 394 | if (msgcount > 1) { |
c50f7fb2 | 395 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 396 | |
39d70a4a HZ |
397 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
398 | gpadl_body = | |
c50f7fb2 | 399 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 400 | |
c50f7fb2 HZ |
401 | gpadl_body->header.msgtype = |
402 | CHANNELMSG_GPADL_BODY; | |
403 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 404 | |
c6977677 | 405 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 406 | submsginfo->msgsize - |
39d70a4a | 407 | sizeof(*submsginfo)); |
fd4dc88e | 408 | if (ret != 0) |
00d760b0 | 409 | goto cleanup; |
99259159 | 410 | |
3e7ee490 HJ |
411 | } |
412 | } | |
40961de3 | 413 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 414 | BUG_ON(t == 0); |
0c3b7b2f | 415 | |
3e7ee490 | 416 | |
454f18a9 | 417 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 418 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 419 | |
00d760b0 | 420 | cleanup: |
15b2f647 | 421 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 422 | list_del(&msginfo->msglistentry); |
15b2f647 | 423 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 424 | |
39d70a4a | 425 | kfree(msginfo); |
3e7ee490 HJ |
426 | return ret; |
427 | } | |
98873724 | 428 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 429 | |
3e189519 | 430 | /* |
fff41b2e | 431 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 432 | */ |
fff41b2e | 433 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 434 | { |
82250213 | 435 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 436 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 437 | unsigned long flags; |
9568a193 | 438 | int ret, t; |
3e7ee490 | 439 | |
f4266e34 GKH |
440 | info = kmalloc(sizeof(*info) + |
441 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
442 | if (!info) |
443 | return -ENOMEM; | |
3e7ee490 | 444 | |
9568a193 | 445 | init_completion(&info->waitevent); |
3e7ee490 | 446 | |
c50f7fb2 | 447 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 448 | |
c50f7fb2 HZ |
449 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
450 | msg->child_relid = channel->offermsg.child_relid; | |
451 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 452 | |
15b2f647 | 453 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 454 | list_add_tail(&info->msglistentry, |
da9fcb72 | 455 | &vmbus_connection.chn_msg_list); |
15b2f647 | 456 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 457 | ret = vmbus_post_msg(msg, |
f4266e34 | 458 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 459 | |
0c3b7b2f | 460 | BUG_ON(ret != 0); |
40961de3 | 461 | t = wait_for_completion_timeout(&info->waitevent, 5*HZ); |
9568a193 | 462 | BUG_ON(t == 0); |
3e7ee490 | 463 | |
454f18a9 | 464 | /* Received a torndown response */ |
15b2f647 | 465 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 466 | list_del(&info->msglistentry); |
15b2f647 | 467 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 468 | |
8c69f52a | 469 | kfree(info); |
3e7ee490 HJ |
470 | return ret; |
471 | } | |
18726d7a | 472 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 473 | |
e68d2971 | 474 | static void vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 475 | { |
82250213 | 476 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 477 | int ret; |
dad76bf7 | 478 | unsigned long flags; |
3e7ee490 | 479 | |
e68d2971 S |
480 | channel->state = CHANNEL_OPEN_STATE; |
481 | channel->sc_creation_callback = NULL; | |
454f18a9 | 482 | /* Stop callback and cancel the timer asap */ |
dad76bf7 | 483 | spin_lock_irqsave(&channel->inbound_lock, flags); |
c50f7fb2 | 484 | channel->onchannel_callback = NULL; |
dad76bf7 | 485 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 | 486 | |
454f18a9 | 487 | /* Send a closing message */ |
3e7ee490 | 488 | |
e9a27a9f | 489 | msg = &channel->close_msg.msg; |
3e7ee490 | 490 | |
c50f7fb2 HZ |
491 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
492 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 493 | |
c6977677 | 494 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 495 | |
0c3b7b2f | 496 | BUG_ON(ret != 0); |
454f18a9 | 497 | /* Tear down the gpadl for the channel's ring buffer */ |
c50f7fb2 | 498 | if (channel->ringbuffer_gpadlhandle) |
fff41b2e | 499 | vmbus_teardown_gpadl(channel, |
c50f7fb2 | 500 | channel->ringbuffer_gpadlhandle); |
3e7ee490 | 501 | |
454f18a9 | 502 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
503 | hv_ringbuffer_cleanup(&channel->outbound); |
504 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 505 | |
df3493e0 S |
506 | free_pages((unsigned long)channel->ringbuffer_pages, |
507 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 508 | |
3e7ee490 | 509 | |
3e7ee490 | 510 | } |
e68d2971 S |
511 | |
512 | /* | |
513 | * vmbus_close - Close the specified channel | |
514 | */ | |
515 | void vmbus_close(struct vmbus_channel *channel) | |
516 | { | |
517 | struct list_head *cur, *tmp; | |
518 | struct vmbus_channel *cur_channel; | |
519 | ||
520 | if (channel->primary_channel != NULL) { | |
521 | /* | |
522 | * We will only close sub-channels when | |
523 | * the primary is closed. | |
524 | */ | |
525 | return; | |
526 | } | |
527 | /* | |
528 | * Close all the sub-channels first and then close the | |
529 | * primary channel. | |
530 | */ | |
531 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
532 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
533 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
534 | continue; | |
535 | vmbus_close_internal(cur_channel); | |
536 | } | |
537 | /* | |
538 | * Now close the primary. | |
539 | */ | |
540 | vmbus_close_internal(channel); | |
541 | } | |
70bfa307 | 542 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 543 | |
c88c4e4c | 544 | /** |
fff41b2e | 545 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
546 | * @channel: Pointer to vmbus_channel structure. |
547 | * @buffer: Pointer to the buffer you want to receive the data into. | |
548 | * @bufferlen: Maximum size of what the the buffer will hold | |
549 | * @requestid: Identifier of the request | |
550 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
551 | * packet etc. |
552 | * | |
39d70a4a | 553 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
554 | * This will send the data unparsed to hyper-v. |
555 | * | |
556 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 557 | */ |
011a7c3c | 558 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
559 | u32 bufferlen, u64 requestid, |
560 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 561 | { |
8dc0a06a | 562 | struct vmpacket_descriptor desc; |
39d70a4a | 563 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 564 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 565 | struct kvec bufferlist[3]; |
39d70a4a | 566 | u64 aligned_data = 0; |
f4266e34 | 567 | int ret; |
98fa8cf4 | 568 | bool signal = false; |
3e7ee490 | 569 | |
3e7ee490 | 570 | |
454f18a9 | 571 | /* Setup the descriptor */ |
415f2287 HZ |
572 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
573 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 574 | /* in 8-bytes granularity */ |
415f2287 HZ |
575 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
576 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
577 | desc.trans_id = requestid; | |
3e7ee490 | 578 | |
011a7c3c S |
579 | bufferlist[0].iov_base = &desc; |
580 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
581 | bufferlist[1].iov_base = buffer; | |
582 | bufferlist[1].iov_len = bufferlen; | |
583 | bufferlist[2].iov_base = &aligned_data; | |
584 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 585 | |
98fa8cf4 | 586 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 587 | |
98fa8cf4 | 588 | if (ret == 0 && signal) |
fff41b2e | 589 | vmbus_setevent(channel); |
3e7ee490 | 590 | |
3e7ee490 HJ |
591 | return ret; |
592 | } | |
fff41b2e | 593 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 594 | |
3e189519 | 595 | /* |
fff41b2e | 596 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 597 | * packets using a GPADL Direct packet type. |
f4266e34 | 598 | */ |
fff41b2e | 599 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
600 | struct hv_page_buffer pagebuffers[], |
601 | u32 pagecount, void *buffer, u32 bufferlen, | |
602 | u64 requestid) | |
3e7ee490 | 603 | { |
f4266e34 GKH |
604 | int ret; |
605 | int i; | |
430a8e9a | 606 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
607 | u32 descsize; |
608 | u32 packetlen; | |
609 | u32 packetlen_aligned; | |
011a7c3c | 610 | struct kvec bufferlist[3]; |
39d70a4a | 611 | u64 aligned_data = 0; |
98fa8cf4 | 612 | bool signal = false; |
3e7ee490 | 613 | |
39d70a4a | 614 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 615 | return -EINVAL; |
3e7ee490 | 616 | |
3e7ee490 | 617 | |
f4266e34 | 618 | /* |
430a8e9a | 619 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
620 | * largest size we support |
621 | */ | |
39d70a4a HZ |
622 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
623 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 624 | sizeof(struct hv_page_buffer)); |
39d70a4a | 625 | packetlen = descsize + bufferlen; |
73509681 | 626 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 627 | |
454f18a9 | 628 | /* Setup the descriptor */ |
415f2287 | 629 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 630 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
631 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
632 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
633 | desc.transactionid = requestid; | |
634 | desc.rangecount = pagecount; | |
635 | ||
636 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
637 | desc.range[i].len = pagebuffers[i].len; |
638 | desc.range[i].offset = pagebuffers[i].offset; | |
639 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
640 | } |
641 | ||
011a7c3c S |
642 | bufferlist[0].iov_base = &desc; |
643 | bufferlist[0].iov_len = descsize; | |
644 | bufferlist[1].iov_base = buffer; | |
645 | bufferlist[1].iov_len = bufferlen; | |
646 | bufferlist[2].iov_base = &aligned_data; | |
647 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 648 | |
98fa8cf4 | 649 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 650 | |
98fa8cf4 | 651 | if (ret == 0 && signal) |
fff41b2e | 652 | vmbus_setevent(channel); |
3e7ee490 | 653 | |
3e7ee490 HJ |
654 | return ret; |
655 | } | |
713efeb4 | 656 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 657 | |
3e189519 | 658 | /* |
fff41b2e | 659 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 660 | * using a GPADL Direct packet type. |
f4266e34 | 661 | */ |
fff41b2e | 662 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
663 | struct hv_multipage_buffer *multi_pagebuffer, |
664 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 665 | { |
f4266e34 | 666 | int ret; |
430a8e9a | 667 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
668 | u32 descsize; |
669 | u32 packetlen; | |
670 | u32 packetlen_aligned; | |
011a7c3c | 671 | struct kvec bufferlist[3]; |
39d70a4a | 672 | u64 aligned_data = 0; |
98fa8cf4 | 673 | bool signal = false; |
ca623ad3 HZ |
674 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
675 | multi_pagebuffer->len); | |
3e7ee490 | 676 | |
3e7ee490 | 677 | |
39d70a4a | 678 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 679 | return -EINVAL; |
3e7ee490 | 680 | |
f4266e34 | 681 | /* |
430a8e9a | 682 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
683 | * the largest size we support |
684 | */ | |
39d70a4a HZ |
685 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
686 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 687 | sizeof(u64)); |
39d70a4a | 688 | packetlen = descsize + bufferlen; |
73509681 | 689 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 690 | |
3e7ee490 | 691 | |
454f18a9 | 692 | /* Setup the descriptor */ |
415f2287 | 693 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 694 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
695 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
696 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
697 | desc.transactionid = requestid; | |
430a8e9a | 698 | desc.rangecount = 1; |
3e7ee490 | 699 | |
ca623ad3 HZ |
700 | desc.range.len = multi_pagebuffer->len; |
701 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 702 | |
ca623ad3 | 703 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 704 | pfncount * sizeof(u64)); |
3e7ee490 | 705 | |
011a7c3c S |
706 | bufferlist[0].iov_base = &desc; |
707 | bufferlist[0].iov_len = descsize; | |
708 | bufferlist[1].iov_base = buffer; | |
709 | bufferlist[1].iov_len = bufferlen; | |
710 | bufferlist[2].iov_base = &aligned_data; | |
711 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 712 | |
98fa8cf4 | 713 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 714 | |
98fa8cf4 | 715 | if (ret == 0 && signal) |
fff41b2e | 716 | vmbus_setevent(channel); |
3e7ee490 | 717 | |
3e7ee490 HJ |
718 | return ret; |
719 | } | |
4cb106fa | 720 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
721 | |
722 | /** | |
fff41b2e | 723 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
724 | * @channel: Pointer to vmbus_channel structure. |
725 | * @buffer: Pointer to the buffer you want to receive the data into. | |
726 | * @bufferlen: Maximum size of what the the buffer will hold | |
727 | * @buffer_actual_len: The actual size of the data after it was received | |
728 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
729 | * |
730 | * Receives directly from the hyper-v vmbus and puts the data it received | |
731 | * into Buffer. This will receive the data unparsed from hyper-v. | |
732 | * | |
733 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 734 | */ |
fff41b2e | 735 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 736 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 737 | { |
8dc0a06a | 738 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
739 | u32 packetlen; |
740 | u32 userlen; | |
3e7ee490 | 741 | int ret; |
c2b8e520 | 742 | bool signal = false; |
3e7ee490 | 743 | |
39d70a4a HZ |
744 | *buffer_actual_len = 0; |
745 | *requestid = 0; | |
3e7ee490 | 746 | |
3e7ee490 | 747 | |
a89186c2 | 748 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 749 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 750 | if (ret != 0) |
3e7ee490 | 751 | return 0; |
3e7ee490 | 752 | |
415f2287 HZ |
753 | packetlen = desc.len8 << 3; |
754 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 755 | |
39d70a4a | 756 | *buffer_actual_len = userlen; |
3e7ee490 | 757 | |
39d70a4a | 758 | if (userlen > bufferlen) { |
3e7ee490 | 759 | |
0a46618d | 760 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 761 | bufferlen, userlen); |
926ae526 | 762 | return -ETOOSMALL; |
3e7ee490 HJ |
763 | } |
764 | ||
415f2287 | 765 | *requestid = desc.trans_id; |
3e7ee490 | 766 | |
454f18a9 | 767 | /* Copy over the packet to the user buffer */ |
38397c8a | 768 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 769 | (desc.offset8 << 3), &signal); |
3e7ee490 | 770 | |
c2b8e520 S |
771 | if (signal) |
772 | vmbus_setevent(channel); | |
3e7ee490 | 773 | |
3e7ee490 HJ |
774 | return 0; |
775 | } | |
fff41b2e | 776 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 777 | |
3e189519 | 778 | /* |
fff41b2e | 779 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 780 | */ |
fff41b2e | 781 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
782 | u32 bufferlen, u32 *buffer_actual_len, |
783 | u64 *requestid) | |
3e7ee490 | 784 | { |
8dc0a06a | 785 | struct vmpacket_descriptor desc; |
39d70a4a | 786 | u32 packetlen; |
3e7ee490 | 787 | int ret; |
c2b8e520 | 788 | bool signal = false; |
3e7ee490 | 789 | |
39d70a4a HZ |
790 | *buffer_actual_len = 0; |
791 | *requestid = 0; | |
3e7ee490 | 792 | |
3e7ee490 | 793 | |
a89186c2 | 794 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 795 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 796 | if (ret != 0) |
3e7ee490 | 797 | return 0; |
3e7ee490 | 798 | |
3e7ee490 | 799 | |
415f2287 | 800 | packetlen = desc.len8 << 3; |
3e7ee490 | 801 | |
39d70a4a | 802 | *buffer_actual_len = packetlen; |
3e7ee490 | 803 | |
39d70a4a | 804 | if (packetlen > bufferlen) { |
0a46618d HJ |
805 | pr_err("Buffer too small - needed %d bytes but " |
806 | "got space for only %d bytes\n", | |
807 | packetlen, bufferlen); | |
3d5cad97 | 808 | return -ENOBUFS; |
3e7ee490 HJ |
809 | } |
810 | ||
415f2287 | 811 | *requestid = desc.trans_id; |
3e7ee490 | 812 | |
454f18a9 | 813 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
814 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
815 | &signal); | |
816 | ||
817 | if (signal) | |
818 | vmbus_setevent(channel); | |
3e7ee490 | 819 | |
33b06938 | 820 | return ret; |
3e7ee490 | 821 | } |
adaee6bd | 822 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |