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> |
63d55b2a | 31 | #include <linux/interrupt.h> |
3f335ea2 | 32 | |
0f2a6619 | 33 | #include "hyperv_vmbus.h" |
3e7ee490 | 34 | |
e3fe0bb6 S |
35 | #define NUM_PAGES_SPANNED(addr, len) \ |
36 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) | |
37 | ||
3e189519 | 38 | /* |
fff41b2e | 39 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 40 | * channel. |
f4266e34 | 41 | */ |
1f6ee4e7 | 42 | void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 43 | { |
39d70a4a | 44 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 45 | |
3724287c S |
46 | /* |
47 | * For channels marked as in "low latency" mode | |
48 | * bypass the monitor page mechanism. | |
49 | */ | |
5c1bec61 SH |
50 | if (channel->offermsg.monitor_allocated && !channel->low_latency) { |
51 | vmbus_send_interrupt(channel->offermsg.child_relid); | |
3e7ee490 | 52 | |
8681db44 GKH |
53 | /* Get the child to parent monitor page */ |
54 | monitorpage = vmbus_connection.monitor_pages[1]; | |
3e7ee490 | 55 | |
22356585 | 56 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
57 | (unsigned long *)&monitorpage->trigger_group |
58 | [channel->monitor_grp].pending); | |
7c369f40 | 59 | |
f4266e34 | 60 | } else { |
21c3bef5 | 61 | vmbus_set_event(channel); |
3e7ee490 | 62 | } |
3e7ee490 | 63 | } |
1f6ee4e7 | 64 | EXPORT_SYMBOL_GPL(vmbus_setevent); |
3e7ee490 | 65 | |
3e189519 | 66 | /* |
fff41b2e | 67 | * vmbus_open - Open the specified channel. |
f4266e34 | 68 | */ |
fff41b2e | 69 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
70 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
71 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 72 | { |
0987ff69 | 73 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 74 | struct vmbus_channel_msginfo *open_info = NULL; |
dd0813b6 | 75 | unsigned long flags; |
08a9513f | 76 | int ret, err = 0; |
294409d2 | 77 | struct page *page; |
3e7ee490 | 78 | |
98f531b1 VK |
79 | if (send_ringbuffer_size % PAGE_SIZE || |
80 | recv_ringbuffer_size % PAGE_SIZE) | |
81 | return -EINVAL; | |
82 | ||
67fae053 | 83 | spin_lock_irqsave(&newchannel->lock, flags); |
e68d2971 S |
84 | if (newchannel->state == CHANNEL_OPEN_STATE) { |
85 | newchannel->state = CHANNEL_OPENING_STATE; | |
86 | } else { | |
67fae053 | 87 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 S |
88 | return -EINVAL; |
89 | } | |
67fae053 | 90 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 | 91 | |
c50f7fb2 HZ |
92 | newchannel->onchannel_callback = onchannelcallback; |
93 | newchannel->channel_callback_context = context; | |
3e7ee490 | 94 | |
454f18a9 | 95 | /* Allocate the ring buffer */ |
294409d2 S |
96 | page = alloc_pages_node(cpu_to_node(newchannel->target_cpu), |
97 | GFP_KERNEL|__GFP_ZERO, | |
98 | get_order(send_ringbuffer_size + | |
99 | recv_ringbuffer_size)); | |
100 | ||
101 | if (!page) | |
98f531b1 VK |
102 | page = alloc_pages(GFP_KERNEL|__GFP_ZERO, |
103 | get_order(send_ringbuffer_size + | |
104 | recv_ringbuffer_size)); | |
df3493e0 | 105 | |
98f531b1 | 106 | if (!page) { |
ac0d12b7 | 107 | err = -ENOMEM; |
98f531b1 | 108 | goto error_set_chnstate; |
ac0d12b7 | 109 | } |
3e7ee490 | 110 | |
9988ce68 | 111 | newchannel->ringbuffer_pages = page_address(page); |
c50f7fb2 | 112 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + |
39d70a4a | 113 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 114 | |
9988ce68 VK |
115 | ret = hv_ringbuffer_init(&newchannel->outbound, page, |
116 | send_ringbuffer_size >> PAGE_SHIFT); | |
72a95cbc | 117 | |
fd4dc88e | 118 | if (ret != 0) { |
3324fb40 | 119 | err = ret; |
98f531b1 | 120 | goto error_free_pages; |
3324fb40 BP |
121 | } |
122 | ||
9988ce68 VK |
123 | ret = hv_ringbuffer_init(&newchannel->inbound, |
124 | &page[send_ringbuffer_size >> PAGE_SHIFT], | |
125 | recv_ringbuffer_size >> PAGE_SHIFT); | |
fd4dc88e | 126 | if (ret != 0) { |
3324fb40 | 127 | err = ret; |
98f531b1 | 128 | goto error_free_pages; |
3324fb40 | 129 | } |
3e7ee490 | 130 | |
3e7ee490 | 131 | |
454f18a9 | 132 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 133 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 134 | |
fff41b2e | 135 | ret = vmbus_establish_gpadl(newchannel, |
9988ce68 VK |
136 | page_address(page), |
137 | send_ringbuffer_size + | |
138 | recv_ringbuffer_size, | |
139 | &newchannel->ringbuffer_gpadlhandle); | |
b94ef345 | 140 | |
fd4dc88e | 141 | if (ret != 0) { |
b94ef345 | 142 | err = ret; |
98f531b1 | 143 | goto error_free_pages; |
b94ef345 | 144 | } |
f4266e34 | 145 | |
454f18a9 | 146 | /* Create and init the channel open message */ |
176fb9e3 | 147 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
148 | sizeof(struct vmbus_channel_open_channel), |
149 | GFP_KERNEL); | |
176fb9e3 | 150 | if (!open_info) { |
c3bf2e26 | 151 | err = -ENOMEM; |
98f531b1 | 152 | goto error_free_gpadl; |
c3bf2e26 | 153 | } |
3e7ee490 | 154 | |
176fb9e3 | 155 | init_completion(&open_info->waitevent); |
ccb61f8a | 156 | open_info->waiting_channel = newchannel; |
3e7ee490 | 157 | |
176fb9e3 | 158 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
159 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
160 | open_msg->openid = newchannel->offermsg.child_relid; | |
161 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
162 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
163 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 164 | PAGE_SHIFT; |
abbf3b2a | 165 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 166 | |
39d70a4a | 167 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 168 | err = -EINVAL; |
98f531b1 | 169 | goto error_free_gpadl; |
c827f944 BP |
170 | } |
171 | ||
39d70a4a | 172 | if (userdatalen) |
0987ff69 | 173 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 174 | |
15b2f647 | 175 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 176 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 177 | &vmbus_connection.chn_msg_list); |
15b2f647 | 178 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 179 | |
6f3d791f S |
180 | if (newchannel->rescind) { |
181 | err = -ENODEV; | |
182 | goto error_free_gpadl; | |
183 | } | |
184 | ||
0987ff69 | 185 | ret = vmbus_post_msg(open_msg, |
c0bb0392 | 186 | sizeof(struct vmbus_channel_open_channel), true); |
98e08702 | 187 | |
9202d771 VK |
188 | trace_vmbus_open(open_msg, ret); |
189 | ||
45d727ce S |
190 | if (ret != 0) { |
191 | err = ret; | |
98f531b1 | 192 | goto error_clean_msglist; |
45d727ce | 193 | } |
3e7ee490 | 194 | |
396e287f | 195 | wait_for_completion(&open_info->waitevent); |
0c3b7b2f | 196 | |
15b2f647 | 197 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 198 | list_del(&open_info->msglistentry); |
15b2f647 | 199 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 200 | |
ccb61f8a S |
201 | if (newchannel->rescind) { |
202 | err = -ENODEV; | |
203 | goto error_free_gpadl; | |
204 | } | |
205 | ||
ffc151f3 VK |
206 | if (open_info->response.open_result.status) { |
207 | err = -EAGAIN; | |
98f531b1 | 208 | goto error_free_gpadl; |
ffc151f3 | 209 | } |
e68d2971 | 210 | |
ffc151f3 | 211 | newchannel->state = CHANNEL_OPENED_STATE; |
176fb9e3 | 212 | kfree(open_info); |
ffc151f3 | 213 | return 0; |
c3bf2e26 | 214 | |
98f531b1 | 215 | error_clean_msglist: |
13925502 S |
216 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
217 | list_del(&open_info->msglistentry); | |
218 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
219 | ||
98f531b1 | 220 | error_free_gpadl: |
40384e4b | 221 | vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle); |
98f531b1 VK |
222 | kfree(open_info); |
223 | error_free_pages: | |
9988ce68 VK |
224 | hv_ringbuffer_cleanup(&newchannel->outbound); |
225 | hv_ringbuffer_cleanup(&newchannel->inbound); | |
226 | __free_pages(page, | |
227 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
98f531b1 | 228 | error_set_chnstate: |
ac0d12b7 | 229 | newchannel->state = CHANNEL_OPEN_STATE; |
c3bf2e26 | 230 | return err; |
3e7ee490 | 231 | } |
36ceadfc | 232 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 233 | |
5c23a1a5 DC |
234 | /* Used for Hyper-V Socket: a guest client's connect() to the host */ |
235 | int vmbus_send_tl_connect_request(const uuid_le *shv_guest_servie_id, | |
236 | const uuid_le *shv_host_servie_id) | |
237 | { | |
238 | struct vmbus_channel_tl_connect_request conn_msg; | |
239 | ||
240 | memset(&conn_msg, 0, sizeof(conn_msg)); | |
241 | conn_msg.header.msgtype = CHANNELMSG_TL_CONNECT_REQUEST; | |
242 | conn_msg.guest_endpoint_id = *shv_guest_servie_id; | |
243 | conn_msg.host_service_id = *shv_host_servie_id; | |
244 | ||
c0bb0392 | 245 | return vmbus_post_msg(&conn_msg, sizeof(conn_msg), true); |
5c23a1a5 DC |
246 | } |
247 | EXPORT_SYMBOL_GPL(vmbus_send_tl_connect_request); | |
248 | ||
3e189519 | 249 | /* |
fff41b2e | 250 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 251 | */ |
fff41b2e | 252 | static int create_gpadl_header(void *kbuffer, u32 size, |
4d637632 | 253 | struct vmbus_channel_msginfo **msginfo) |
3e7ee490 HJ |
254 | { |
255 | int i; | |
39d70a4a | 256 | int pagecount; |
39d70a4a HZ |
257 | struct vmbus_channel_gpadl_header *gpadl_header; |
258 | struct vmbus_channel_gpadl_body *gpadl_body; | |
259 | struct vmbus_channel_msginfo *msgheader; | |
260 | struct vmbus_channel_msginfo *msgbody = NULL; | |
261 | u32 msgsize; | |
3e7ee490 | 262 | |
39d70a4a | 263 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 264 | |
39d70a4a | 265 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 266 | |
454f18a9 | 267 | /* do we need a gpadl body msg */ |
39d70a4a | 268 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
269 | sizeof(struct vmbus_channel_gpadl_header) - |
270 | sizeof(struct gpa_range); | |
39d70a4a | 271 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 272 | |
39d70a4a | 273 | if (pagecount > pfncount) { |
f4266e34 | 274 | /* we need a gpadl body */ |
454f18a9 | 275 | /* fill in the header */ |
39d70a4a | 276 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 277 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
278 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
279 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
280 | if (!msgheader) | |
d1c250bb | 281 | goto nomem; |
3e7ee490 | 282 | |
c50f7fb2 HZ |
283 | INIT_LIST_HEAD(&msgheader->submsglist); |
284 | msgheader->msgsize = msgsize; | |
3e7ee490 | 285 | |
39d70a4a | 286 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
287 | msgheader->msg; |
288 | gpadl_header->rangecount = 1; | |
289 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 290 | pagecount * sizeof(u64); |
415f2287 HZ |
291 | gpadl_header->range[0].byte_offset = 0; |
292 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 293 | for (i = 0; i < pfncount; i++) |
b679ef73 HZ |
294 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
295 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a | 296 | *msginfo = msgheader; |
3e7ee490 | 297 | |
39d70a4a HZ |
298 | pfnsum = pfncount; |
299 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 300 | |
454f18a9 | 301 | /* how many pfns can we fit */ |
39d70a4a | 302 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 303 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 304 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 305 | |
454f18a9 | 306 | /* fill in the body */ |
39d70a4a HZ |
307 | while (pfnleft) { |
308 | if (pfnleft > pfncount) | |
309 | pfncurr = pfncount; | |
3e7ee490 | 310 | else |
39d70a4a | 311 | pfncurr = pfnleft; |
3e7ee490 | 312 | |
39d70a4a | 313 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 314 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
315 | pfncurr * sizeof(u64); |
316 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
317 | |
318 | if (!msgbody) { | |
319 | struct vmbus_channel_msginfo *pos = NULL; | |
320 | struct vmbus_channel_msginfo *tmp = NULL; | |
321 | /* | |
322 | * Free up all the allocated messages. | |
323 | */ | |
324 | list_for_each_entry_safe(pos, tmp, | |
325 | &msgheader->submsglist, | |
326 | msglistentry) { | |
327 | ||
328 | list_del(&pos->msglistentry); | |
329 | kfree(pos); | |
330 | } | |
331 | ||
d1c250bb | 332 | goto nomem; |
f38cf9cc S |
333 | } |
334 | ||
c50f7fb2 | 335 | msgbody->msgsize = msgsize; |
39d70a4a | 336 | gpadl_body = |
c50f7fb2 | 337 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
338 | |
339 | /* | |
f4266e34 GKH |
340 | * Gpadl is u32 and we are using a pointer which could |
341 | * be 64-bit | |
f27df643 | 342 | * This is governed by the guest/host protocol and |
bdc1dd47 | 343 | * so the hypervisor guarantees that this is ok. |
f4266e34 | 344 | */ |
39d70a4a | 345 | for (i = 0; i < pfncurr; i++) |
b679ef73 HZ |
346 | gpadl_body->pfn[i] = slow_virt_to_phys( |
347 | kbuffer + PAGE_SIZE * (pfnsum + i)) >> | |
348 | PAGE_SHIFT; | |
3e7ee490 | 349 | |
454f18a9 | 350 | /* add to msg header */ |
c50f7fb2 HZ |
351 | list_add_tail(&msgbody->msglistentry, |
352 | &msgheader->submsglist); | |
39d70a4a HZ |
353 | pfnsum += pfncurr; |
354 | pfnleft -= pfncurr; | |
3e7ee490 | 355 | } |
f4266e34 | 356 | } else { |
454f18a9 | 357 | /* everything fits in a header */ |
39d70a4a | 358 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 359 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
360 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
361 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
362 | if (msgheader == NULL) | |
e3eb7cdd | 363 | goto nomem; |
4d637632 VK |
364 | |
365 | INIT_LIST_HEAD(&msgheader->submsglist); | |
c50f7fb2 | 366 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
367 | |
368 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
369 | msgheader->msg; |
370 | gpadl_header->rangecount = 1; | |
371 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 372 | pagecount * sizeof(u64); |
415f2287 HZ |
373 | gpadl_header->range[0].byte_offset = 0; |
374 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 375 | for (i = 0; i < pagecount; i++) |
b679ef73 HZ |
376 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
377 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
378 | |
379 | *msginfo = msgheader; | |
3e7ee490 HJ |
380 | } |
381 | ||
382 | return 0; | |
d1c250bb | 383 | nomem: |
39d70a4a HZ |
384 | kfree(msgheader); |
385 | kfree(msgbody); | |
d1c250bb | 386 | return -ENOMEM; |
3e7ee490 HJ |
387 | } |
388 | ||
3e189519 | 389 | /* |
bdc1dd47 | 390 | * vmbus_establish_gpadl - Establish a GPADL for the specified buffer |
f4266e34 | 391 | * |
39d70a4a | 392 | * @channel: a channel |
b679ef73 | 393 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
394 | * @size: page-size multiple |
395 | * @gpadl_handle: some funky thing | |
f4266e34 | 396 | */ |
fff41b2e | 397 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 398 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 399 | { |
39d70a4a HZ |
400 | struct vmbus_channel_gpadl_header *gpadlmsg; |
401 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a | 402 | struct vmbus_channel_msginfo *msginfo = NULL; |
7cc80c98 | 403 | struct vmbus_channel_msginfo *submsginfo, *tmp; |
53af545b | 404 | struct list_head *curr; |
39d70a4a | 405 | u32 next_gpadl_handle; |
dd0813b6 | 406 | unsigned long flags; |
c3bf2e26 | 407 | int ret = 0; |
3e7ee490 | 408 | |
9f52a163 S |
409 | next_gpadl_handle = |
410 | (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); | |
3e7ee490 | 411 | |
4d637632 | 412 | ret = create_gpadl_header(kbuffer, size, &msginfo); |
c3bf2e26 BP |
413 | if (ret) |
414 | return ret; | |
3e7ee490 | 415 | |
9568a193 | 416 | init_completion(&msginfo->waitevent); |
ccb61f8a | 417 | msginfo->waiting_channel = channel; |
c3bf2e26 | 418 | |
c50f7fb2 HZ |
419 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
420 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
421 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
422 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 423 | |
3e7ee490 | 424 | |
15b2f647 | 425 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 426 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 427 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 428 | |
15b2f647 | 429 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 430 | |
6f3d791f S |
431 | if (channel->rescind) { |
432 | ret = -ENODEV; | |
433 | goto cleanup; | |
434 | } | |
435 | ||
c6977677 | 436 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
c0bb0392 | 437 | sizeof(*msginfo), true); |
69edbd5f VK |
438 | |
439 | trace_vmbus_establish_gpadl_header(gpadlmsg, ret); | |
440 | ||
98e08702 | 441 | if (ret != 0) |
00d760b0 | 442 | goto cleanup; |
3e7ee490 | 443 | |
4d637632 VK |
444 | list_for_each(curr, &msginfo->submsglist) { |
445 | submsginfo = (struct vmbus_channel_msginfo *)curr; | |
446 | gpadl_body = | |
447 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; | |
53af545b | 448 | |
4d637632 VK |
449 | gpadl_body->header.msgtype = |
450 | CHANNELMSG_GPADL_BODY; | |
451 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 452 | |
4d637632 | 453 | ret = vmbus_post_msg(gpadl_body, |
c0bb0392 VK |
454 | submsginfo->msgsize - sizeof(*submsginfo), |
455 | true); | |
69edbd5f VK |
456 | |
457 | trace_vmbus_establish_gpadl_body(gpadl_body, ret); | |
458 | ||
4d637632 VK |
459 | if (ret != 0) |
460 | goto cleanup; | |
3e7ee490 | 461 | |
3e7ee490 | 462 | } |
72c6b71c | 463 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 464 | |
ccb61f8a S |
465 | if (channel->rescind) { |
466 | ret = -ENODEV; | |
467 | goto cleanup; | |
468 | } | |
469 | ||
454f18a9 | 470 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 471 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 472 | |
00d760b0 | 473 | cleanup: |
15b2f647 | 474 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 475 | list_del(&msginfo->msglistentry); |
15b2f647 | 476 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
7cc80c98 VK |
477 | list_for_each_entry_safe(submsginfo, tmp, &msginfo->submsglist, |
478 | msglistentry) { | |
479 | kfree(submsginfo); | |
480 | } | |
3e7ee490 | 481 | |
39d70a4a | 482 | kfree(msginfo); |
3e7ee490 HJ |
483 | return ret; |
484 | } | |
98873724 | 485 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 486 | |
3e189519 | 487 | /* |
fff41b2e | 488 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 489 | */ |
fff41b2e | 490 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 491 | { |
82250213 | 492 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 493 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 494 | unsigned long flags; |
66be6530 | 495 | int ret; |
3e7ee490 | 496 | |
f4266e34 GKH |
497 | info = kmalloc(sizeof(*info) + |
498 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
499 | if (!info) |
500 | return -ENOMEM; | |
3e7ee490 | 501 | |
9568a193 | 502 | init_completion(&info->waitevent); |
ccb61f8a | 503 | info->waiting_channel = channel; |
3e7ee490 | 504 | |
c50f7fb2 | 505 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 506 | |
c50f7fb2 HZ |
507 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
508 | msg->child_relid = channel->offermsg.child_relid; | |
509 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 510 | |
15b2f647 | 511 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 512 | list_add_tail(&info->msglistentry, |
da9fcb72 | 513 | &vmbus_connection.chn_msg_list); |
15b2f647 | 514 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
6f3d791f S |
515 | |
516 | if (channel->rescind) | |
517 | goto post_msg_err; | |
518 | ||
c0bb0392 VK |
519 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_gpadl_teardown), |
520 | true); | |
3e7ee490 | 521 | |
09cdf8f8 VK |
522 | trace_vmbus_teardown_gpadl(msg, ret); |
523 | ||
66be6530 S |
524 | if (ret) |
525 | goto post_msg_err; | |
526 | ||
527 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 528 | |
66be6530 | 529 | post_msg_err: |
5e030d5c S |
530 | /* |
531 | * If the channel has been rescinded; | |
532 | * we will be awakened by the rescind | |
533 | * handler; set the error code to zero so we don't leak memory. | |
534 | */ | |
535 | if (channel->rescind) | |
536 | ret = 0; | |
537 | ||
15b2f647 | 538 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 539 | list_del(&info->msglistentry); |
15b2f647 | 540 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 541 | |
8c69f52a | 542 | kfree(info); |
3e7ee490 HJ |
543 | return ret; |
544 | } | |
18726d7a | 545 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 546 | |
d3ba720d S |
547 | static void reset_channel_cb(void *arg) |
548 | { | |
549 | struct vmbus_channel *channel = arg; | |
550 | ||
551 | channel->onchannel_callback = NULL; | |
552 | } | |
553 | ||
98d731bb | 554 | static int vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 555 | { |
82250213 | 556 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 557 | int ret; |
3e7ee490 | 558 | |
63d55b2a | 559 | /* |
dad72a1d | 560 | * vmbus_on_event(), running in the per-channel tasklet, can race |
63d55b2a DC |
561 | * with vmbus_close_internal() in the case of SMP guest, e.g., when |
562 | * the former is accessing channel->inbound.ring_buffer, the latter | |
dad72a1d DC |
563 | * could be freeing the ring_buffer pages, so here we must stop it |
564 | * first. | |
63d55b2a | 565 | */ |
dad72a1d | 566 | tasklet_disable(&channel->callback_event); |
63d55b2a | 567 | |
64b7faf9 DC |
568 | /* |
569 | * In case a device driver's probe() fails (e.g., | |
570 | * util_probe() -> vmbus_open() returns -ENOMEM) and the device is | |
8a1115ff | 571 | * rescinded later (e.g., we dynamically disable an Integrated Service |
64b7faf9 DC |
572 | * in Hyper-V Manager), the driver's remove() invokes vmbus_close(): |
573 | * here we should skip most of the below cleanup work. | |
574 | */ | |
575 | if (channel->state != CHANNEL_OPENED_STATE) { | |
576 | ret = -EINVAL; | |
577 | goto out; | |
578 | } | |
579 | ||
e68d2971 S |
580 | channel->state = CHANNEL_OPEN_STATE; |
581 | channel->sc_creation_callback = NULL; | |
454f18a9 | 582 | /* Stop callback and cancel the timer asap */ |
2115b561 S |
583 | if (channel->target_cpu != get_cpu()) { |
584 | put_cpu(); | |
d3ba720d S |
585 | smp_call_function_single(channel->target_cpu, reset_channel_cb, |
586 | channel, true); | |
2115b561 | 587 | } else { |
d3ba720d | 588 | reset_channel_cb(channel); |
2115b561 S |
589 | put_cpu(); |
590 | } | |
3e7ee490 | 591 | |
454f18a9 | 592 | /* Send a closing message */ |
3e7ee490 | 593 | |
e9a27a9f | 594 | msg = &channel->close_msg.msg; |
3e7ee490 | 595 | |
c50f7fb2 HZ |
596 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
597 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 598 | |
c0bb0392 VK |
599 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel), |
600 | true); | |
3e7ee490 | 601 | |
633b005d VK |
602 | trace_vmbus_close_internal(msg, ret); |
603 | ||
98d731bb S |
604 | if (ret) { |
605 | pr_err("Close failed: close post msg return is %d\n", ret); | |
606 | /* | |
607 | * If we failed to post the close msg, | |
608 | * it is perhaps better to leak memory. | |
609 | */ | |
63d55b2a | 610 | goto out; |
98d731bb S |
611 | } |
612 | ||
454f18a9 | 613 | /* Tear down the gpadl for the channel's ring buffer */ |
98d731bb S |
614 | if (channel->ringbuffer_gpadlhandle) { |
615 | ret = vmbus_teardown_gpadl(channel, | |
616 | channel->ringbuffer_gpadlhandle); | |
617 | if (ret) { | |
618 | pr_err("Close failed: teardown gpadl return %d\n", ret); | |
619 | /* | |
620 | * If we failed to teardown gpadl, | |
621 | * it is perhaps better to leak memory. | |
622 | */ | |
63d55b2a | 623 | goto out; |
98d731bb S |
624 | } |
625 | } | |
3e7ee490 | 626 | |
454f18a9 | 627 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
628 | hv_ringbuffer_cleanup(&channel->outbound); |
629 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 630 | |
df3493e0 S |
631 | free_pages((unsigned long)channel->ringbuffer_pages, |
632 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 633 | |
63d55b2a | 634 | out: |
6463a457 SH |
635 | /* re-enable tasklet for use on re-open */ |
636 | tasklet_enable(&channel->callback_event); | |
98d731bb | 637 | return ret; |
3e7ee490 | 638 | } |
e68d2971 S |
639 | |
640 | /* | |
641 | * vmbus_close - Close the specified channel | |
642 | */ | |
643 | void vmbus_close(struct vmbus_channel *channel) | |
644 | { | |
645 | struct list_head *cur, *tmp; | |
646 | struct vmbus_channel *cur_channel; | |
647 | ||
648 | if (channel->primary_channel != NULL) { | |
649 | /* | |
650 | * We will only close sub-channels when | |
651 | * the primary is closed. | |
652 | */ | |
653 | return; | |
654 | } | |
192b2d78 | 655 | mutex_lock(&vmbus_connection.channel_mutex); |
e68d2971 S |
656 | /* |
657 | * Close all the sub-channels first and then close the | |
658 | * primary channel. | |
659 | */ | |
660 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
661 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
e68d2971 | 662 | vmbus_close_internal(cur_channel); |
54a66265 | 663 | if (cur_channel->rescind) { |
192b2d78 | 664 | hv_process_channel_removal( |
54a66265 | 665 | cur_channel->offermsg.child_relid); |
54a66265 | 666 | } |
e68d2971 S |
667 | } |
668 | /* | |
669 | * Now close the primary. | |
670 | */ | |
671 | vmbus_close_internal(channel); | |
192b2d78 | 672 | mutex_unlock(&vmbus_connection.channel_mutex); |
e68d2971 | 673 | } |
70bfa307 | 674 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 675 | |
5dd0fb9b | 676 | /** |
677 | * vmbus_sendpacket() - Send the specified buffer on the given channel | |
678 | * @channel: Pointer to vmbus_channel structure. | |
679 | * @buffer: Pointer to the buffer you want to receive the data into. | |
680 | * @bufferlen: Maximum size of what the the buffer will hold | |
681 | * @requestid: Identifier of the request | |
682 | * @type: Type of packet that is being send e.g. negotiate, time | |
683 | * packet etc. | |
684 | * | |
685 | * Sends data in @buffer directly to hyper-v via the vmbus | |
686 | * This will send the data unparsed to hyper-v. | |
687 | * | |
688 | * Mainly used by Hyper-V drivers. | |
689 | */ | |
690 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, | |
691 | u32 bufferlen, u64 requestid, | |
692 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 693 | { |
8dc0a06a | 694 | struct vmpacket_descriptor desc; |
39d70a4a | 695 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 696 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 697 | struct kvec bufferlist[3]; |
39d70a4a | 698 | u64 aligned_data = 0; |
b81658cf | 699 | int num_vecs = ((bufferlen != 0) ? 3 : 1); |
3e7ee490 | 700 | |
3e7ee490 | 701 | |
454f18a9 | 702 | /* Setup the descriptor */ |
415f2287 HZ |
703 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
704 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 705 | /* in 8-bytes granularity */ |
415f2287 HZ |
706 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
707 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
708 | desc.trans_id = requestid; | |
3e7ee490 | 709 | |
011a7c3c S |
710 | bufferlist[0].iov_base = &desc; |
711 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
712 | bufferlist[1].iov_base = buffer; | |
713 | bufferlist[1].iov_len = bufferlen; | |
714 | bufferlist[2].iov_base = &aligned_data; | |
715 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 716 | |
5529eaf6 | 717 | return hv_ringbuffer_write(channel, bufferlist, num_vecs); |
3e7ee490 | 718 | } |
fff41b2e | 719 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 720 | |
3e189519 | 721 | /* |
5a668d8c | 722 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
87e93d61 S |
723 | * packets using a GPADL Direct packet type. This interface allows you |
724 | * to control notifying the host. This will be useful for sending | |
725 | * batched data. Also the sender can control the send flags | |
726 | * explicitly. | |
f4266e34 | 727 | */ |
5a668d8c | 728 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
729 | struct hv_page_buffer pagebuffers[], | |
730 | u32 pagecount, void *buffer, u32 bufferlen, | |
731 | u64 requestid) | |
3e7ee490 | 732 | { |
f4266e34 | 733 | int i; |
430a8e9a | 734 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
735 | u32 descsize; |
736 | u32 packetlen; | |
737 | u32 packetlen_aligned; | |
011a7c3c | 738 | struct kvec bufferlist[3]; |
39d70a4a | 739 | u64 aligned_data = 0; |
3e7ee490 | 740 | |
39d70a4a | 741 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 742 | return -EINVAL; |
3e7ee490 | 743 | |
f4266e34 | 744 | /* |
430a8e9a | 745 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
746 | * largest size we support |
747 | */ | |
39d70a4a HZ |
748 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
749 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 750 | sizeof(struct hv_page_buffer)); |
39d70a4a | 751 | packetlen = descsize + bufferlen; |
73509681 | 752 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 753 | |
454f18a9 | 754 | /* Setup the descriptor */ |
415f2287 | 755 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
5a668d8c | 756 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
bdc1dd47 | 757 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes granularity */ |
39d70a4a HZ |
758 | desc.length8 = (u16)(packetlen_aligned >> 3); |
759 | desc.transactionid = requestid; | |
33d426a9 | 760 | desc.reserved = 0; |
39d70a4a HZ |
761 | desc.rangecount = pagecount; |
762 | ||
763 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
764 | desc.range[i].len = pagebuffers[i].len; |
765 | desc.range[i].offset = pagebuffers[i].offset; | |
766 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
767 | } |
768 | ||
011a7c3c S |
769 | bufferlist[0].iov_base = &desc; |
770 | bufferlist[0].iov_len = descsize; | |
771 | bufferlist[1].iov_base = buffer; | |
772 | bufferlist[1].iov_len = bufferlen; | |
773 | bufferlist[2].iov_base = &aligned_data; | |
774 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 775 | |
5529eaf6 | 776 | return hv_ringbuffer_write(channel, bufferlist, 3); |
3e7ee490 | 777 | } |
713efeb4 | 778 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 779 | |
d61031ee S |
780 | /* |
781 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet | |
782 | * using a GPADL Direct packet type. | |
783 | * The buffer includes the vmbus descriptor. | |
784 | */ | |
785 | int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, | |
786 | struct vmbus_packet_mpb_array *desc, | |
787 | u32 desc_size, | |
788 | void *buffer, u32 bufferlen, u64 requestid) | |
789 | { | |
d61031ee S |
790 | u32 packetlen; |
791 | u32 packetlen_aligned; | |
792 | struct kvec bufferlist[3]; | |
793 | u64 aligned_data = 0; | |
d61031ee S |
794 | |
795 | packetlen = desc_size + bufferlen; | |
796 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); | |
797 | ||
798 | /* Setup the descriptor */ | |
799 | desc->type = VM_PKT_DATA_USING_GPA_DIRECT; | |
800 | desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
bdc1dd47 | 801 | desc->dataoffset8 = desc_size >> 3; /* in 8-bytes granularity */ |
d61031ee S |
802 | desc->length8 = (u16)(packetlen_aligned >> 3); |
803 | desc->transactionid = requestid; | |
33d426a9 | 804 | desc->reserved = 0; |
d61031ee S |
805 | desc->rangecount = 1; |
806 | ||
807 | bufferlist[0].iov_base = desc; | |
808 | bufferlist[0].iov_len = desc_size; | |
809 | bufferlist[1].iov_base = buffer; | |
810 | bufferlist[1].iov_len = bufferlen; | |
811 | bufferlist[2].iov_base = &aligned_data; | |
812 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
813 | ||
5529eaf6 | 814 | return hv_ringbuffer_write(channel, bufferlist, 3); |
d61031ee S |
815 | } |
816 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc); | |
817 | ||
c88c4e4c | 818 | /** |
fff41b2e | 819 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
820 | * @channel: Pointer to vmbus_channel structure. |
821 | * @buffer: Pointer to the buffer you want to receive the data into. | |
822 | * @bufferlen: Maximum size of what the the buffer will hold | |
823 | * @buffer_actual_len: The actual size of the data after it was received | |
824 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
825 | * |
826 | * Receives directly from the hyper-v vmbus and puts the data it received | |
827 | * into Buffer. This will receive the data unparsed from hyper-v. | |
828 | * | |
829 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 830 | */ |
667d3740 VK |
831 | static inline int |
832 | __vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, | |
833 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid, | |
834 | bool raw) | |
3e7ee490 | 835 | { |
3372592a S |
836 | return hv_ringbuffer_read(channel, buffer, bufferlen, |
837 | buffer_actual_len, requestid, raw); | |
3e7ee490 | 838 | |
667d3740 VK |
839 | } |
840 | ||
841 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, | |
842 | u32 bufferlen, u32 *buffer_actual_len, | |
843 | u64 *requestid) | |
844 | { | |
845 | return __vmbus_recvpacket(channel, buffer, bufferlen, | |
846 | buffer_actual_len, requestid, false); | |
3e7ee490 | 847 | } |
fff41b2e | 848 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 849 | |
3e189519 | 850 | /* |
fff41b2e | 851 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 852 | */ |
fff41b2e | 853 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
854 | u32 bufferlen, u32 *buffer_actual_len, |
855 | u64 *requestid) | |
3e7ee490 | 856 | { |
667d3740 VK |
857 | return __vmbus_recvpacket(channel, buffer, bufferlen, |
858 | buffer_actual_len, requestid, true); | |
3e7ee490 | 859 | } |
adaee6bd | 860 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |