Commit | Line | Data |
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3b20eb23 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3e7ee490 | 2 | /* |
3e7ee490 HJ |
3 | * Copyright (c) 2009, Microsoft Corporation. |
4 | * | |
3e7ee490 HJ |
5 | * Authors: |
6 | * Haiyang Zhang <haiyangz@microsoft.com> | |
7 | * Hank Janssen <hjanssen@microsoft.com> | |
3e7ee490 | 8 | */ |
0a46618d HJ |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | ||
5654e932 | 11 | #include <linux/kernel.h> |
0c3b7b2f S |
12 | #include <linux/sched.h> |
13 | #include <linux/wait.h> | |
a0086dc5 | 14 | #include <linux/mm.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
c88c4e4c | 16 | #include <linux/module.h> |
46a97191 | 17 | #include <linux/hyperv.h> |
011a7c3c | 18 | #include <linux/uio.h> |
63d55b2a | 19 | #include <linux/interrupt.h> |
6ba34171 | 20 | #include <asm/page.h> |
3f335ea2 | 21 | |
0f2a6619 | 22 | #include "hyperv_vmbus.h" |
3e7ee490 | 23 | |
e3fe0bb6 S |
24 | #define NUM_PAGES_SPANNED(addr, len) \ |
25 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) | |
26 | ||
6ba34171 MK |
27 | static unsigned long virt_to_hvpfn(void *addr) |
28 | { | |
a9fc4340 | 29 | phys_addr_t paddr; |
6ba34171 MK |
30 | |
31 | if (is_vmalloc_addr(addr)) | |
32 | paddr = page_to_phys(vmalloc_to_page(addr)) + | |
33 | offset_in_page(addr); | |
34 | else | |
35 | paddr = __pa(addr); | |
36 | ||
37 | return paddr >> PAGE_SHIFT; | |
38 | } | |
39 | ||
3e189519 | 40 | /* |
fff41b2e | 41 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 42 | * channel. |
f4266e34 | 43 | */ |
1f6ee4e7 | 44 | void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 45 | { |
39d70a4a | 46 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 47 | |
991f8f1c VK |
48 | trace_vmbus_setevent(channel); |
49 | ||
3724287c S |
50 | /* |
51 | * For channels marked as in "low latency" mode | |
52 | * bypass the monitor page mechanism. | |
53 | */ | |
5c1bec61 SH |
54 | if (channel->offermsg.monitor_allocated && !channel->low_latency) { |
55 | vmbus_send_interrupt(channel->offermsg.child_relid); | |
3e7ee490 | 56 | |
8681db44 GKH |
57 | /* Get the child to parent monitor page */ |
58 | monitorpage = vmbus_connection.monitor_pages[1]; | |
3e7ee490 | 59 | |
22356585 | 60 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
61 | (unsigned long *)&monitorpage->trigger_group |
62 | [channel->monitor_grp].pending); | |
7c369f40 | 63 | |
f4266e34 | 64 | } else { |
21c3bef5 | 65 | vmbus_set_event(channel); |
3e7ee490 | 66 | } |
3e7ee490 | 67 | } |
1f6ee4e7 | 68 | EXPORT_SYMBOL_GPL(vmbus_setevent); |
3e7ee490 | 69 | |
ae6935ed SH |
70 | /* vmbus_free_ring - drop mapping of ring buffer */ |
71 | void vmbus_free_ring(struct vmbus_channel *channel) | |
3e7ee490 | 72 | { |
ae6935ed SH |
73 | hv_ringbuffer_cleanup(&channel->outbound); |
74 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 75 | |
ae6935ed SH |
76 | if (channel->ringbuffer_page) { |
77 | __free_pages(channel->ringbuffer_page, | |
78 | get_order(channel->ringbuffer_pagecount | |
79 | << PAGE_SHIFT)); | |
80 | channel->ringbuffer_page = NULL; | |
81 | } | |
82 | } | |
83 | EXPORT_SYMBOL_GPL(vmbus_free_ring); | |
98f531b1 | 84 | |
ae6935ed SH |
85 | /* vmbus_alloc_ring - allocate and map pages for ring buffer */ |
86 | int vmbus_alloc_ring(struct vmbus_channel *newchannel, | |
87 | u32 send_size, u32 recv_size) | |
88 | { | |
89 | struct page *page; | |
90 | int order; | |
52a42c2a | 91 | |
ae6935ed | 92 | if (send_size % PAGE_SIZE || recv_size % PAGE_SIZE) |
e68d2971 | 93 | return -EINVAL; |
3e7ee490 | 94 | |
454f18a9 | 95 | /* Allocate the ring buffer */ |
ae6935ed | 96 | order = get_order(send_size + recv_size); |
294409d2 | 97 | page = alloc_pages_node(cpu_to_node(newchannel->target_cpu), |
52a42c2a | 98 | GFP_KERNEL|__GFP_ZERO, order); |
294409d2 S |
99 | |
100 | if (!page) | |
52a42c2a | 101 | page = alloc_pages(GFP_KERNEL|__GFP_ZERO, order); |
df3493e0 | 102 | |
ae6935ed SH |
103 | if (!page) |
104 | return -ENOMEM; | |
3e7ee490 | 105 | |
52a42c2a | 106 | newchannel->ringbuffer_page = page; |
ae6935ed SH |
107 | newchannel->ringbuffer_pagecount = (send_size + recv_size) >> PAGE_SHIFT; |
108 | newchannel->ringbuffer_send_offset = send_size >> PAGE_SHIFT; | |
3e7ee490 | 109 | |
ae6935ed SH |
110 | return 0; |
111 | } | |
112 | EXPORT_SYMBOL_GPL(vmbus_alloc_ring); | |
72a95cbc | 113 | |
ae6935ed SH |
114 | static int __vmbus_open(struct vmbus_channel *newchannel, |
115 | void *userdata, u32 userdatalen, | |
116 | void (*onchannelcallback)(void *context), void *context) | |
117 | { | |
118 | struct vmbus_channel_open_channel *open_msg; | |
119 | struct vmbus_channel_msginfo *open_info = NULL; | |
120 | struct page *page = newchannel->ringbuffer_page; | |
121 | u32 send_pages, recv_pages; | |
122 | unsigned long flags; | |
123 | int err; | |
3324fb40 | 124 | |
ae6935ed SH |
125 | if (userdatalen > MAX_USER_DEFINED_BYTES) |
126 | return -EINVAL; | |
127 | ||
128 | send_pages = newchannel->ringbuffer_send_offset; | |
129 | recv_pages = newchannel->ringbuffer_pagecount - send_pages; | |
130 | ||
131 | spin_lock_irqsave(&newchannel->lock, flags); | |
132 | if (newchannel->state != CHANNEL_OPEN_STATE) { | |
133 | spin_unlock_irqrestore(&newchannel->lock, flags); | |
134 | return -EINVAL; | |
3324fb40 | 135 | } |
ae6935ed | 136 | spin_unlock_irqrestore(&newchannel->lock, flags); |
3e7ee490 | 137 | |
ae6935ed SH |
138 | newchannel->state = CHANNEL_OPENING_STATE; |
139 | newchannel->onchannel_callback = onchannelcallback; | |
140 | newchannel->channel_callback_context = context; | |
141 | ||
142 | err = hv_ringbuffer_init(&newchannel->outbound, page, send_pages); | |
143 | if (err) | |
144 | goto error_clean_ring; | |
145 | ||
146 | err = hv_ringbuffer_init(&newchannel->inbound, | |
147 | &page[send_pages], recv_pages); | |
148 | if (err) | |
149 | goto error_clean_ring; | |
3e7ee490 | 150 | |
454f18a9 | 151 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 152 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 153 | |
ae6935ed SH |
154 | err = vmbus_establish_gpadl(newchannel, |
155 | page_address(newchannel->ringbuffer_page), | |
156 | (send_pages + recv_pages) << PAGE_SHIFT, | |
9988ce68 | 157 | &newchannel->ringbuffer_gpadlhandle); |
ae6935ed SH |
158 | if (err) |
159 | goto error_clean_ring; | |
f4266e34 | 160 | |
454f18a9 | 161 | /* Create and init the channel open message */ |
176fb9e3 | 162 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
163 | sizeof(struct vmbus_channel_open_channel), |
164 | GFP_KERNEL); | |
176fb9e3 | 165 | if (!open_info) { |
c3bf2e26 | 166 | err = -ENOMEM; |
98f531b1 | 167 | goto error_free_gpadl; |
c3bf2e26 | 168 | } |
3e7ee490 | 169 | |
176fb9e3 | 170 | init_completion(&open_info->waitevent); |
ccb61f8a | 171 | open_info->waiting_channel = newchannel; |
3e7ee490 | 172 | |
176fb9e3 | 173 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
174 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
175 | open_msg->openid = newchannel->offermsg.child_relid; | |
176 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
177 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
ae6935ed | 178 | open_msg->downstream_ringbuffer_pageoffset = newchannel->ringbuffer_send_offset; |
abbf3b2a | 179 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 180 | |
39d70a4a | 181 | if (userdatalen) |
0987ff69 | 182 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 183 | |
15b2f647 | 184 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 185 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 186 | &vmbus_connection.chn_msg_list); |
15b2f647 | 187 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 188 | |
6f3d791f S |
189 | if (newchannel->rescind) { |
190 | err = -ENODEV; | |
ae6935ed | 191 | goto error_free_info; |
6f3d791f S |
192 | } |
193 | ||
ae6935ed | 194 | err = vmbus_post_msg(open_msg, |
c0bb0392 | 195 | sizeof(struct vmbus_channel_open_channel), true); |
98e08702 | 196 | |
ae6935ed | 197 | trace_vmbus_open(open_msg, err); |
9202d771 | 198 | |
ae6935ed | 199 | if (err != 0) |
98f531b1 | 200 | goto error_clean_msglist; |
3e7ee490 | 201 | |
396e287f | 202 | wait_for_completion(&open_info->waitevent); |
0c3b7b2f | 203 | |
15b2f647 | 204 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 205 | list_del(&open_info->msglistentry); |
15b2f647 | 206 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 207 | |
ccb61f8a S |
208 | if (newchannel->rescind) { |
209 | err = -ENODEV; | |
ae6935ed | 210 | goto error_free_info; |
ccb61f8a S |
211 | } |
212 | ||
ffc151f3 VK |
213 | if (open_info->response.open_result.status) { |
214 | err = -EAGAIN; | |
ae6935ed | 215 | goto error_free_info; |
ffc151f3 | 216 | } |
e68d2971 | 217 | |
ffc151f3 | 218 | newchannel->state = CHANNEL_OPENED_STATE; |
176fb9e3 | 219 | kfree(open_info); |
ffc151f3 | 220 | return 0; |
c3bf2e26 | 221 | |
98f531b1 | 222 | error_clean_msglist: |
13925502 S |
223 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
224 | list_del(&open_info->msglistentry); | |
225 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
ae6935ed SH |
226 | error_free_info: |
227 | kfree(open_info); | |
98f531b1 | 228 | error_free_gpadl: |
40384e4b | 229 | vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle); |
ae6935ed SH |
230 | newchannel->ringbuffer_gpadlhandle = 0; |
231 | error_clean_ring: | |
9988ce68 VK |
232 | hv_ringbuffer_cleanup(&newchannel->outbound); |
233 | hv_ringbuffer_cleanup(&newchannel->inbound); | |
ac0d12b7 | 234 | newchannel->state = CHANNEL_OPEN_STATE; |
c3bf2e26 | 235 | return err; |
3e7ee490 | 236 | } |
ae6935ed SH |
237 | |
238 | /* | |
239 | * vmbus_connect_ring - Open the channel but reuse ring buffer | |
240 | */ | |
241 | int vmbus_connect_ring(struct vmbus_channel *newchannel, | |
242 | void (*onchannelcallback)(void *context), void *context) | |
243 | { | |
244 | return __vmbus_open(newchannel, NULL, 0, onchannelcallback, context); | |
245 | } | |
246 | EXPORT_SYMBOL_GPL(vmbus_connect_ring); | |
247 | ||
248 | /* | |
249 | * vmbus_open - Open the specified channel. | |
250 | */ | |
251 | int vmbus_open(struct vmbus_channel *newchannel, | |
252 | u32 send_ringbuffer_size, u32 recv_ringbuffer_size, | |
253 | void *userdata, u32 userdatalen, | |
254 | void (*onchannelcallback)(void *context), void *context) | |
255 | { | |
256 | int err; | |
257 | ||
258 | err = vmbus_alloc_ring(newchannel, send_ringbuffer_size, | |
259 | recv_ringbuffer_size); | |
260 | if (err) | |
261 | return err; | |
262 | ||
263 | err = __vmbus_open(newchannel, userdata, userdatalen, | |
264 | onchannelcallback, context); | |
265 | if (err) | |
266 | vmbus_free_ring(newchannel); | |
267 | ||
268 | return err; | |
269 | } | |
36ceadfc | 270 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 271 | |
5c23a1a5 | 272 | /* Used for Hyper-V Socket: a guest client's connect() to the host */ |
593db803 AS |
273 | int vmbus_send_tl_connect_request(const guid_t *shv_guest_servie_id, |
274 | const guid_t *shv_host_servie_id) | |
5c23a1a5 DC |
275 | { |
276 | struct vmbus_channel_tl_connect_request conn_msg; | |
98f31a00 | 277 | int ret; |
5c23a1a5 DC |
278 | |
279 | memset(&conn_msg, 0, sizeof(conn_msg)); | |
280 | conn_msg.header.msgtype = CHANNELMSG_TL_CONNECT_REQUEST; | |
281 | conn_msg.guest_endpoint_id = *shv_guest_servie_id; | |
282 | conn_msg.host_service_id = *shv_host_servie_id; | |
283 | ||
98f31a00 VK |
284 | ret = vmbus_post_msg(&conn_msg, sizeof(conn_msg), true); |
285 | ||
286 | trace_vmbus_send_tl_connect_request(&conn_msg, ret); | |
287 | ||
288 | return ret; | |
5c23a1a5 DC |
289 | } |
290 | EXPORT_SYMBOL_GPL(vmbus_send_tl_connect_request); | |
291 | ||
3e189519 | 292 | /* |
fff41b2e | 293 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 294 | */ |
fff41b2e | 295 | static int create_gpadl_header(void *kbuffer, u32 size, |
4d637632 | 296 | struct vmbus_channel_msginfo **msginfo) |
3e7ee490 HJ |
297 | { |
298 | int i; | |
39d70a4a | 299 | int pagecount; |
39d70a4a HZ |
300 | struct vmbus_channel_gpadl_header *gpadl_header; |
301 | struct vmbus_channel_gpadl_body *gpadl_body; | |
302 | struct vmbus_channel_msginfo *msgheader; | |
303 | struct vmbus_channel_msginfo *msgbody = NULL; | |
304 | u32 msgsize; | |
3e7ee490 | 305 | |
39d70a4a | 306 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 307 | |
39d70a4a | 308 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 309 | |
454f18a9 | 310 | /* do we need a gpadl body msg */ |
39d70a4a | 311 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
312 | sizeof(struct vmbus_channel_gpadl_header) - |
313 | sizeof(struct gpa_range); | |
39d70a4a | 314 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 315 | |
39d70a4a | 316 | if (pagecount > pfncount) { |
f4266e34 | 317 | /* we need a gpadl body */ |
454f18a9 | 318 | /* fill in the header */ |
39d70a4a | 319 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 320 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
321 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
322 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
323 | if (!msgheader) | |
d1c250bb | 324 | goto nomem; |
3e7ee490 | 325 | |
c50f7fb2 HZ |
326 | INIT_LIST_HEAD(&msgheader->submsglist); |
327 | msgheader->msgsize = msgsize; | |
3e7ee490 | 328 | |
39d70a4a | 329 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
330 | msgheader->msg; |
331 | gpadl_header->rangecount = 1; | |
332 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 333 | pagecount * sizeof(u64); |
415f2287 HZ |
334 | gpadl_header->range[0].byte_offset = 0; |
335 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 336 | for (i = 0; i < pfncount; i++) |
6ba34171 MK |
337 | gpadl_header->range[0].pfn_array[i] = virt_to_hvpfn( |
338 | kbuffer + PAGE_SIZE * i); | |
39d70a4a | 339 | *msginfo = msgheader; |
3e7ee490 | 340 | |
39d70a4a HZ |
341 | pfnsum = pfncount; |
342 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 343 | |
454f18a9 | 344 | /* how many pfns can we fit */ |
39d70a4a | 345 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 346 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 347 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 348 | |
454f18a9 | 349 | /* fill in the body */ |
39d70a4a HZ |
350 | while (pfnleft) { |
351 | if (pfnleft > pfncount) | |
352 | pfncurr = pfncount; | |
3e7ee490 | 353 | else |
39d70a4a | 354 | pfncurr = pfnleft; |
3e7ee490 | 355 | |
39d70a4a | 356 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 357 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
358 | pfncurr * sizeof(u64); |
359 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
360 | |
361 | if (!msgbody) { | |
362 | struct vmbus_channel_msginfo *pos = NULL; | |
363 | struct vmbus_channel_msginfo *tmp = NULL; | |
364 | /* | |
365 | * Free up all the allocated messages. | |
366 | */ | |
367 | list_for_each_entry_safe(pos, tmp, | |
368 | &msgheader->submsglist, | |
369 | msglistentry) { | |
370 | ||
371 | list_del(&pos->msglistentry); | |
372 | kfree(pos); | |
373 | } | |
374 | ||
d1c250bb | 375 | goto nomem; |
f38cf9cc S |
376 | } |
377 | ||
c50f7fb2 | 378 | msgbody->msgsize = msgsize; |
39d70a4a | 379 | gpadl_body = |
c50f7fb2 | 380 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
381 | |
382 | /* | |
f4266e34 GKH |
383 | * Gpadl is u32 and we are using a pointer which could |
384 | * be 64-bit | |
f27df643 | 385 | * This is governed by the guest/host protocol and |
bdc1dd47 | 386 | * so the hypervisor guarantees that this is ok. |
f4266e34 | 387 | */ |
39d70a4a | 388 | for (i = 0; i < pfncurr; i++) |
6ba34171 MK |
389 | gpadl_body->pfn[i] = virt_to_hvpfn( |
390 | kbuffer + PAGE_SIZE * (pfnsum + i)); | |
3e7ee490 | 391 | |
454f18a9 | 392 | /* add to msg header */ |
c50f7fb2 HZ |
393 | list_add_tail(&msgbody->msglistentry, |
394 | &msgheader->submsglist); | |
39d70a4a HZ |
395 | pfnsum += pfncurr; |
396 | pfnleft -= pfncurr; | |
3e7ee490 | 397 | } |
f4266e34 | 398 | } else { |
454f18a9 | 399 | /* everything fits in a header */ |
39d70a4a | 400 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 401 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
402 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
403 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
404 | if (msgheader == NULL) | |
e3eb7cdd | 405 | goto nomem; |
4d637632 VK |
406 | |
407 | INIT_LIST_HEAD(&msgheader->submsglist); | |
c50f7fb2 | 408 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
409 | |
410 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
411 | msgheader->msg; |
412 | gpadl_header->rangecount = 1; | |
413 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 414 | pagecount * sizeof(u64); |
415f2287 HZ |
415 | gpadl_header->range[0].byte_offset = 0; |
416 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 417 | for (i = 0; i < pagecount; i++) |
6ba34171 MK |
418 | gpadl_header->range[0].pfn_array[i] = virt_to_hvpfn( |
419 | kbuffer + PAGE_SIZE * i); | |
39d70a4a HZ |
420 | |
421 | *msginfo = msgheader; | |
3e7ee490 HJ |
422 | } |
423 | ||
424 | return 0; | |
d1c250bb | 425 | nomem: |
39d70a4a HZ |
426 | kfree(msgheader); |
427 | kfree(msgbody); | |
d1c250bb | 428 | return -ENOMEM; |
3e7ee490 HJ |
429 | } |
430 | ||
3e189519 | 431 | /* |
bdc1dd47 | 432 | * vmbus_establish_gpadl - Establish a GPADL for the specified buffer |
f4266e34 | 433 | * |
39d70a4a | 434 | * @channel: a channel |
b679ef73 | 435 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
436 | * @size: page-size multiple |
437 | * @gpadl_handle: some funky thing | |
f4266e34 | 438 | */ |
fff41b2e | 439 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 440 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 441 | { |
39d70a4a HZ |
442 | struct vmbus_channel_gpadl_header *gpadlmsg; |
443 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a | 444 | struct vmbus_channel_msginfo *msginfo = NULL; |
7cc80c98 | 445 | struct vmbus_channel_msginfo *submsginfo, *tmp; |
53af545b | 446 | struct list_head *curr; |
39d70a4a | 447 | u32 next_gpadl_handle; |
dd0813b6 | 448 | unsigned long flags; |
c3bf2e26 | 449 | int ret = 0; |
3e7ee490 | 450 | |
9f52a163 S |
451 | next_gpadl_handle = |
452 | (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); | |
3e7ee490 | 453 | |
4d637632 | 454 | ret = create_gpadl_header(kbuffer, size, &msginfo); |
c3bf2e26 BP |
455 | if (ret) |
456 | return ret; | |
3e7ee490 | 457 | |
9568a193 | 458 | init_completion(&msginfo->waitevent); |
ccb61f8a | 459 | msginfo->waiting_channel = channel; |
c3bf2e26 | 460 | |
c50f7fb2 HZ |
461 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
462 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
463 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
464 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 465 | |
3e7ee490 | 466 | |
15b2f647 | 467 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 468 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 469 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 470 | |
15b2f647 | 471 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 472 | |
6f3d791f S |
473 | if (channel->rescind) { |
474 | ret = -ENODEV; | |
475 | goto cleanup; | |
476 | } | |
477 | ||
c6977677 | 478 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
c0bb0392 | 479 | sizeof(*msginfo), true); |
69edbd5f VK |
480 | |
481 | trace_vmbus_establish_gpadl_header(gpadlmsg, ret); | |
482 | ||
98e08702 | 483 | if (ret != 0) |
00d760b0 | 484 | goto cleanup; |
3e7ee490 | 485 | |
4d637632 VK |
486 | list_for_each(curr, &msginfo->submsglist) { |
487 | submsginfo = (struct vmbus_channel_msginfo *)curr; | |
488 | gpadl_body = | |
489 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; | |
53af545b | 490 | |
4d637632 VK |
491 | gpadl_body->header.msgtype = |
492 | CHANNELMSG_GPADL_BODY; | |
493 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 494 | |
4d637632 | 495 | ret = vmbus_post_msg(gpadl_body, |
c0bb0392 VK |
496 | submsginfo->msgsize - sizeof(*submsginfo), |
497 | true); | |
69edbd5f VK |
498 | |
499 | trace_vmbus_establish_gpadl_body(gpadl_body, ret); | |
500 | ||
4d637632 VK |
501 | if (ret != 0) |
502 | goto cleanup; | |
3e7ee490 | 503 | |
3e7ee490 | 504 | } |
72c6b71c | 505 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 506 | |
eceb0596 DC |
507 | if (msginfo->response.gpadl_created.creation_status != 0) { |
508 | pr_err("Failed to establish GPADL: err = 0x%x\n", | |
509 | msginfo->response.gpadl_created.creation_status); | |
510 | ||
511 | ret = -EDQUOT; | |
512 | goto cleanup; | |
513 | } | |
514 | ||
ccb61f8a S |
515 | if (channel->rescind) { |
516 | ret = -ENODEV; | |
517 | goto cleanup; | |
518 | } | |
519 | ||
454f18a9 | 520 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 521 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 522 | |
00d760b0 | 523 | cleanup: |
15b2f647 | 524 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 525 | list_del(&msginfo->msglistentry); |
15b2f647 | 526 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
7cc80c98 VK |
527 | list_for_each_entry_safe(submsginfo, tmp, &msginfo->submsglist, |
528 | msglistentry) { | |
529 | kfree(submsginfo); | |
530 | } | |
3e7ee490 | 531 | |
39d70a4a | 532 | kfree(msginfo); |
3e7ee490 HJ |
533 | return ret; |
534 | } | |
98873724 | 535 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 536 | |
3e189519 | 537 | /* |
fff41b2e | 538 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 539 | */ |
fff41b2e | 540 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 541 | { |
82250213 | 542 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 543 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 544 | unsigned long flags; |
66be6530 | 545 | int ret; |
3e7ee490 | 546 | |
f4266e34 GKH |
547 | info = kmalloc(sizeof(*info) + |
548 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
549 | if (!info) |
550 | return -ENOMEM; | |
3e7ee490 | 551 | |
9568a193 | 552 | init_completion(&info->waitevent); |
ccb61f8a | 553 | info->waiting_channel = channel; |
3e7ee490 | 554 | |
c50f7fb2 | 555 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 556 | |
c50f7fb2 HZ |
557 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
558 | msg->child_relid = channel->offermsg.child_relid; | |
559 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 560 | |
15b2f647 | 561 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 562 | list_add_tail(&info->msglistentry, |
da9fcb72 | 563 | &vmbus_connection.chn_msg_list); |
15b2f647 | 564 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
6f3d791f S |
565 | |
566 | if (channel->rescind) | |
567 | goto post_msg_err; | |
568 | ||
c0bb0392 VK |
569 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_gpadl_teardown), |
570 | true); | |
3e7ee490 | 571 | |
09cdf8f8 VK |
572 | trace_vmbus_teardown_gpadl(msg, ret); |
573 | ||
66be6530 S |
574 | if (ret) |
575 | goto post_msg_err; | |
576 | ||
577 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 578 | |
66be6530 | 579 | post_msg_err: |
5e030d5c S |
580 | /* |
581 | * If the channel has been rescinded; | |
582 | * we will be awakened by the rescind | |
583 | * handler; set the error code to zero so we don't leak memory. | |
584 | */ | |
585 | if (channel->rescind) | |
586 | ret = 0; | |
587 | ||
15b2f647 | 588 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 589 | list_del(&info->msglistentry); |
15b2f647 | 590 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 591 | |
8c69f52a | 592 | kfree(info); |
3e7ee490 HJ |
593 | return ret; |
594 | } | |
18726d7a | 595 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 596 | |
d3ba720d S |
597 | static void reset_channel_cb(void *arg) |
598 | { | |
599 | struct vmbus_channel *channel = arg; | |
600 | ||
601 | channel->onchannel_callback = NULL; | |
602 | } | |
603 | ||
d3b26dd7 | 604 | void vmbus_reset_channel_cb(struct vmbus_channel *channel) |
3e7ee490 | 605 | { |
63d55b2a | 606 | /* |
dad72a1d | 607 | * vmbus_on_event(), running in the per-channel tasklet, can race |
63d55b2a DC |
608 | * with vmbus_close_internal() in the case of SMP guest, e.g., when |
609 | * the former is accessing channel->inbound.ring_buffer, the latter | |
dad72a1d DC |
610 | * could be freeing the ring_buffer pages, so here we must stop it |
611 | * first. | |
63d55b2a | 612 | */ |
dad72a1d | 613 | tasklet_disable(&channel->callback_event); |
63d55b2a | 614 | |
d3b26dd7 DC |
615 | channel->sc_creation_callback = NULL; |
616 | ||
617 | /* Stop the callback asap */ | |
618 | if (channel->target_cpu != get_cpu()) { | |
619 | put_cpu(); | |
620 | smp_call_function_single(channel->target_cpu, reset_channel_cb, | |
621 | channel, true); | |
622 | } else { | |
623 | reset_channel_cb(channel); | |
624 | put_cpu(); | |
625 | } | |
626 | ||
627 | /* Re-enable tasklet for use on re-open */ | |
628 | tasklet_enable(&channel->callback_event); | |
629 | } | |
630 | ||
631 | static int vmbus_close_internal(struct vmbus_channel *channel) | |
632 | { | |
633 | struct vmbus_channel_close_channel *msg; | |
634 | int ret; | |
635 | ||
636 | vmbus_reset_channel_cb(channel); | |
637 | ||
64b7faf9 DC |
638 | /* |
639 | * In case a device driver's probe() fails (e.g., | |
640 | * util_probe() -> vmbus_open() returns -ENOMEM) and the device is | |
8a1115ff | 641 | * rescinded later (e.g., we dynamically disable an Integrated Service |
64b7faf9 DC |
642 | * in Hyper-V Manager), the driver's remove() invokes vmbus_close(): |
643 | * here we should skip most of the below cleanup work. | |
644 | */ | |
ae6935ed SH |
645 | if (channel->state != CHANNEL_OPENED_STATE) |
646 | return -EINVAL; | |
64b7faf9 | 647 | |
e68d2971 | 648 | channel->state = CHANNEL_OPEN_STATE; |
3e7ee490 | 649 | |
454f18a9 | 650 | /* Send a closing message */ |
3e7ee490 | 651 | |
e9a27a9f | 652 | msg = &channel->close_msg.msg; |
3e7ee490 | 653 | |
c50f7fb2 HZ |
654 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
655 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 656 | |
c0bb0392 VK |
657 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel), |
658 | true); | |
3e7ee490 | 659 | |
633b005d VK |
660 | trace_vmbus_close_internal(msg, ret); |
661 | ||
98d731bb S |
662 | if (ret) { |
663 | pr_err("Close failed: close post msg return is %d\n", ret); | |
664 | /* | |
665 | * If we failed to post the close msg, | |
666 | * it is perhaps better to leak memory. | |
667 | */ | |
98d731bb S |
668 | } |
669 | ||
454f18a9 | 670 | /* Tear down the gpadl for the channel's ring buffer */ |
ae6935ed | 671 | else if (channel->ringbuffer_gpadlhandle) { |
98d731bb S |
672 | ret = vmbus_teardown_gpadl(channel, |
673 | channel->ringbuffer_gpadlhandle); | |
674 | if (ret) { | |
675 | pr_err("Close failed: teardown gpadl return %d\n", ret); | |
676 | /* | |
677 | * If we failed to teardown gpadl, | |
678 | * it is perhaps better to leak memory. | |
679 | */ | |
98d731bb | 680 | } |
3e7ee490 | 681 | |
ae6935ed SH |
682 | channel->ringbuffer_gpadlhandle = 0; |
683 | } | |
3e7ee490 | 684 | |
98d731bb | 685 | return ret; |
3e7ee490 | 686 | } |
e68d2971 | 687 | |
ae6935ed SH |
688 | /* disconnect ring - close all channels */ |
689 | int vmbus_disconnect_ring(struct vmbus_channel *channel) | |
e68d2971 | 690 | { |
ae6935ed | 691 | struct vmbus_channel *cur_channel, *tmp; |
ae6935ed | 692 | int ret; |
e68d2971 | 693 | |
ae6935ed SH |
694 | if (channel->primary_channel != NULL) |
695 | return -EINVAL; | |
696 | ||
b5679ceb | 697 | list_for_each_entry_safe(cur_channel, tmp, &channel->sc_list, sc_list) { |
ae6935ed | 698 | if (cur_channel->rescind) |
7fa32e5e | 699 | wait_for_completion(&cur_channel->rescind_event); |
ae6935ed SH |
700 | |
701 | mutex_lock(&vmbus_connection.channel_mutex); | |
702 | if (vmbus_close_internal(cur_channel) == 0) { | |
703 | vmbus_free_ring(cur_channel); | |
704 | ||
705 | if (cur_channel->rescind) | |
706 | hv_process_channel_removal(cur_channel); | |
54a66265 | 707 | } |
7fa32e5e | 708 | mutex_unlock(&vmbus_connection.channel_mutex); |
e68d2971 | 709 | } |
ae6935ed | 710 | |
e68d2971 S |
711 | /* |
712 | * Now close the primary. | |
713 | */ | |
7fa32e5e | 714 | mutex_lock(&vmbus_connection.channel_mutex); |
ae6935ed | 715 | ret = vmbus_close_internal(channel); |
192b2d78 | 716 | mutex_unlock(&vmbus_connection.channel_mutex); |
ae6935ed SH |
717 | |
718 | return ret; | |
719 | } | |
720 | EXPORT_SYMBOL_GPL(vmbus_disconnect_ring); | |
721 | ||
722 | /* | |
723 | * vmbus_close - Close the specified channel | |
724 | */ | |
725 | void vmbus_close(struct vmbus_channel *channel) | |
726 | { | |
727 | if (vmbus_disconnect_ring(channel) == 0) | |
728 | vmbus_free_ring(channel); | |
e68d2971 | 729 | } |
70bfa307 | 730 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 731 | |
5dd0fb9b | 732 | /** |
733 | * vmbus_sendpacket() - Send the specified buffer on the given channel | |
fe857bb4 DC |
734 | * @channel: Pointer to vmbus_channel structure |
735 | * @buffer: Pointer to the buffer you want to send the data from. | |
736 | * @bufferlen: Maximum size of what the buffer holds. | |
5dd0fb9b | 737 | * @requestid: Identifier of the request |
fe857bb4 DC |
738 | * @type: Type of packet that is being sent e.g. negotiate, time |
739 | * packet etc. | |
740 | * @flags: 0 or VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED | |
5dd0fb9b | 741 | * |
fe857bb4 DC |
742 | * Sends data in @buffer directly to Hyper-V via the vmbus. |
743 | * This will send the data unparsed to Hyper-V. | |
5dd0fb9b | 744 | * |
745 | * Mainly used by Hyper-V drivers. | |
746 | */ | |
747 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, | |
748 | u32 bufferlen, u64 requestid, | |
749 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 750 | { |
8dc0a06a | 751 | struct vmpacket_descriptor desc; |
39d70a4a | 752 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 753 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 754 | struct kvec bufferlist[3]; |
39d70a4a | 755 | u64 aligned_data = 0; |
b81658cf | 756 | int num_vecs = ((bufferlen != 0) ? 3 : 1); |
3e7ee490 | 757 | |
3e7ee490 | 758 | |
454f18a9 | 759 | /* Setup the descriptor */ |
415f2287 HZ |
760 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
761 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 762 | /* in 8-bytes granularity */ |
415f2287 HZ |
763 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
764 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
765 | desc.trans_id = requestid; | |
3e7ee490 | 766 | |
011a7c3c S |
767 | bufferlist[0].iov_base = &desc; |
768 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
769 | bufferlist[1].iov_base = buffer; | |
770 | bufferlist[1].iov_len = bufferlen; | |
771 | bufferlist[2].iov_base = &aligned_data; | |
772 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 773 | |
5529eaf6 | 774 | return hv_ringbuffer_write(channel, bufferlist, num_vecs); |
3e7ee490 | 775 | } |
fff41b2e | 776 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 777 | |
3e189519 | 778 | /* |
5a668d8c | 779 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
87e93d61 S |
780 | * packets using a GPADL Direct packet type. This interface allows you |
781 | * to control notifying the host. This will be useful for sending | |
782 | * batched data. Also the sender can control the send flags | |
783 | * explicitly. | |
f4266e34 | 784 | */ |
5a668d8c | 785 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
786 | struct hv_page_buffer pagebuffers[], | |
787 | u32 pagecount, void *buffer, u32 bufferlen, | |
788 | u64 requestid) | |
3e7ee490 | 789 | { |
f4266e34 | 790 | int i; |
430a8e9a | 791 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
792 | u32 descsize; |
793 | u32 packetlen; | |
794 | u32 packetlen_aligned; | |
011a7c3c | 795 | struct kvec bufferlist[3]; |
39d70a4a | 796 | u64 aligned_data = 0; |
3e7ee490 | 797 | |
39d70a4a | 798 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 799 | return -EINVAL; |
3e7ee490 | 800 | |
f4266e34 | 801 | /* |
430a8e9a | 802 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
803 | * largest size we support |
804 | */ | |
39d70a4a HZ |
805 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
806 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 807 | sizeof(struct hv_page_buffer)); |
39d70a4a | 808 | packetlen = descsize + bufferlen; |
73509681 | 809 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 810 | |
454f18a9 | 811 | /* Setup the descriptor */ |
415f2287 | 812 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
5a668d8c | 813 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
bdc1dd47 | 814 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes granularity */ |
39d70a4a HZ |
815 | desc.length8 = (u16)(packetlen_aligned >> 3); |
816 | desc.transactionid = requestid; | |
33d426a9 | 817 | desc.reserved = 0; |
39d70a4a HZ |
818 | desc.rangecount = pagecount; |
819 | ||
820 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
821 | desc.range[i].len = pagebuffers[i].len; |
822 | desc.range[i].offset = pagebuffers[i].offset; | |
823 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
824 | } |
825 | ||
011a7c3c S |
826 | bufferlist[0].iov_base = &desc; |
827 | bufferlist[0].iov_len = descsize; | |
828 | bufferlist[1].iov_base = buffer; | |
829 | bufferlist[1].iov_len = bufferlen; | |
830 | bufferlist[2].iov_base = &aligned_data; | |
831 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 832 | |
5529eaf6 | 833 | return hv_ringbuffer_write(channel, bufferlist, 3); |
3e7ee490 | 834 | } |
713efeb4 | 835 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 836 | |
d61031ee S |
837 | /* |
838 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet | |
839 | * using a GPADL Direct packet type. | |
840 | * The buffer includes the vmbus descriptor. | |
841 | */ | |
842 | int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, | |
843 | struct vmbus_packet_mpb_array *desc, | |
844 | u32 desc_size, | |
845 | void *buffer, u32 bufferlen, u64 requestid) | |
846 | { | |
d61031ee S |
847 | u32 packetlen; |
848 | u32 packetlen_aligned; | |
849 | struct kvec bufferlist[3]; | |
850 | u64 aligned_data = 0; | |
d61031ee S |
851 | |
852 | packetlen = desc_size + bufferlen; | |
853 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); | |
854 | ||
855 | /* Setup the descriptor */ | |
856 | desc->type = VM_PKT_DATA_USING_GPA_DIRECT; | |
857 | desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
bdc1dd47 | 858 | desc->dataoffset8 = desc_size >> 3; /* in 8-bytes granularity */ |
d61031ee S |
859 | desc->length8 = (u16)(packetlen_aligned >> 3); |
860 | desc->transactionid = requestid; | |
33d426a9 | 861 | desc->reserved = 0; |
d61031ee S |
862 | desc->rangecount = 1; |
863 | ||
864 | bufferlist[0].iov_base = desc; | |
865 | bufferlist[0].iov_len = desc_size; | |
866 | bufferlist[1].iov_base = buffer; | |
867 | bufferlist[1].iov_len = bufferlen; | |
868 | bufferlist[2].iov_base = &aligned_data; | |
869 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
870 | ||
5529eaf6 | 871 | return hv_ringbuffer_write(channel, bufferlist, 3); |
d61031ee S |
872 | } |
873 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc); | |
874 | ||
c88c4e4c | 875 | /** |
fe857bb4 DC |
876 | * __vmbus_recvpacket() - Retrieve the user packet on the specified channel |
877 | * @channel: Pointer to vmbus_channel structure | |
39d70a4a | 878 | * @buffer: Pointer to the buffer you want to receive the data into. |
fe857bb4 DC |
879 | * @bufferlen: Maximum size of what the buffer can hold. |
880 | * @buffer_actual_len: The actual size of the data after it was received. | |
39d70a4a | 881 | * @requestid: Identifier of the request |
fe857bb4 | 882 | * @raw: true means keep the vmpacket_descriptor header in the received data. |
c88c4e4c HJ |
883 | * |
884 | * Receives directly from the hyper-v vmbus and puts the data it received | |
885 | * into Buffer. This will receive the data unparsed from hyper-v. | |
886 | * | |
887 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 888 | */ |
667d3740 VK |
889 | static inline int |
890 | __vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, | |
891 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid, | |
892 | bool raw) | |
3e7ee490 | 893 | { |
3372592a S |
894 | return hv_ringbuffer_read(channel, buffer, bufferlen, |
895 | buffer_actual_len, requestid, raw); | |
3e7ee490 | 896 | |
667d3740 VK |
897 | } |
898 | ||
899 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, | |
900 | u32 bufferlen, u32 *buffer_actual_len, | |
901 | u64 *requestid) | |
902 | { | |
903 | return __vmbus_recvpacket(channel, buffer, bufferlen, | |
904 | buffer_actual_len, requestid, false); | |
3e7ee490 | 905 | } |
fff41b2e | 906 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 907 | |
3e189519 | 908 | /* |
fff41b2e | 909 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 910 | */ |
fff41b2e | 911 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
912 | u32 bufferlen, u32 *buffer_actual_len, |
913 | u64 *requestid) | |
3e7ee490 | 914 | { |
667d3740 VK |
915 | return __vmbus_recvpacket(channel, buffer, bufferlen, |
916 | buffer_actual_len, requestid, true); | |
3e7ee490 | 917 | } |
adaee6bd | 918 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |