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> |
e3fe0bb6 | 29 | #include "hv_api.h" |
645954c5 | 30 | #include "logging.h" |
72daf320 | 31 | #include "vmbus_private.h" |
3e7ee490 | 32 | |
e3fe0bb6 S |
33 | #define NUM_PAGES_SPANNED(addr, len) \ |
34 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) | |
35 | ||
454f18a9 | 36 | /* Internal routines */ |
fff41b2e | 37 | static int create_gpadl_header( |
39d70a4a HZ |
38 | void *kbuffer, /* must be phys and virt contiguous */ |
39 | u32 size, /* page-size multiple */ | |
40 | struct vmbus_channel_msginfo **msginfo, | |
41 | u32 *messagecount); | |
fff41b2e HZ |
42 | static void dump_vmbus_channel(struct vmbus_channel *channel); |
43 | static void vmbus_setevent(struct vmbus_channel *channel); | |
3e7ee490 HJ |
44 | |
45 | ||
46 | #if 0 | |
f4266e34 | 47 | static void DumpMonitorPage(struct hv_monitor_page *MonitorPage) |
3e7ee490 | 48 | { |
f4266e34 GKH |
49 | int i = 0; |
50 | int j = 0; | |
3e7ee490 | 51 | |
f4266e34 | 52 | DPRINT_DBG(VMBUS, "monitorPage - %p, trigger state - %d", |
f6feebe0 | 53 | MonitorPage, MonitorPage->trigger_state); |
3e7ee490 | 54 | |
f4266e34 GKH |
55 | for (i = 0; i < 4; i++) |
56 | DPRINT_DBG(VMBUS, "trigger group (%d) - %llx", i, | |
f6feebe0 | 57 | MonitorPage->trigger_group[i].as_uint64); |
3e7ee490 | 58 | |
f4266e34 GKH |
59 | for (i = 0; i < 4; i++) { |
60 | for (j = 0; j < 32; j++) { | |
61 | DPRINT_DBG(VMBUS, "latency (%d)(%d) - %llx", i, j, | |
f6feebe0 | 62 | MonitorPage->latency[i][j]); |
3e7ee490 HJ |
63 | } |
64 | } | |
f4266e34 GKH |
65 | for (i = 0; i < 4; i++) { |
66 | for (j = 0; j < 32; j++) { | |
67 | DPRINT_DBG(VMBUS, "param-conn id (%d)(%d) - %d", i, j, | |
f6feebe0 | 68 | MonitorPage->parameter[i][j].connectionid.asu32); |
f4266e34 | 69 | DPRINT_DBG(VMBUS, "param-flag (%d)(%d) - %d", i, j, |
f6feebe0 | 70 | MonitorPage->parameter[i][j].flag_number); |
3e7ee490 HJ |
71 | } |
72 | } | |
73 | } | |
74 | #endif | |
75 | ||
3e189519 | 76 | /* |
fff41b2e | 77 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 78 | * channel. |
f4266e34 | 79 | */ |
fff41b2e | 80 | static void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 81 | { |
39d70a4a | 82 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 83 | |
c50f7fb2 | 84 | if (channel->offermsg.monitor_allocated) { |
454f18a9 | 85 | /* Each u32 represents 32 channels */ |
22356585 | 86 | sync_set_bit(channel->offermsg.child_relid & 31, |
da9fcb72 | 87 | (unsigned long *) vmbus_connection.send_int_page + |
c50f7fb2 | 88 | (channel->offermsg.child_relid >> 5)); |
3e7ee490 | 89 | |
da9fcb72 | 90 | monitorpage = vmbus_connection.monitor_pages; |
39d70a4a | 91 | monitorpage++; /* Get the child to parent monitor page */ |
3e7ee490 | 92 | |
22356585 | 93 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
94 | (unsigned long *)&monitorpage->trigger_group |
95 | [channel->monitor_grp].pending); | |
7c369f40 | 96 | |
f4266e34 | 97 | } else { |
c6977677 | 98 | vmbus_set_event(channel->offermsg.child_relid); |
3e7ee490 | 99 | } |
3e7ee490 HJ |
100 | } |
101 | ||
102 | #if 0 | |
aded7165 | 103 | static void VmbusChannelClearEvent(struct vmbus_channel *channel) |
3e7ee490 | 104 | { |
eacb1b4d | 105 | struct hv_monitor_page *monitorPage; |
3e7ee490 | 106 | |
c50f7fb2 | 107 | if (Channel->offermsg.monitor_allocated) { |
454f18a9 | 108 | /* Each u32 represents 32 channels */ |
22356585 | 109 | sync_clear_bit(Channel->offermsg.child_relid & 31, |
da9fcb72 | 110 | (unsigned long *)vmbus_connection.send_int_page + |
c50f7fb2 | 111 | (Channel->offermsg.child_relid >> 5)); |
3e7ee490 | 112 | |
da9fcb72 HZ |
113 | monitorPage = (struct hv_monitor_page *) |
114 | vmbus_connection.monitor_pages; | |
454f18a9 | 115 | monitorPage++; /* Get the child to parent monitor page */ |
3e7ee490 | 116 | |
22356585 | 117 | sync_clear_bit(Channel->monitor_bit, |
f6feebe0 | 118 | (unsigned long *)&monitorPage->trigger_group |
c50f7fb2 | 119 | [Channel->monitor_grp].Pending); |
3e7ee490 | 120 | } |
3e7ee490 HJ |
121 | } |
122 | ||
123 | #endif | |
3e189519 | 124 | /* |
fff41b2e | 125 | * vmbus_get_debug_info -Retrieve various channel debug info |
f4266e34 | 126 | */ |
fff41b2e | 127 | void vmbus_get_debug_info(struct vmbus_channel *channel, |
39d70a4a | 128 | struct vmbus_channel_debug_info *debuginfo) |
3e7ee490 | 129 | { |
39d70a4a | 130 | struct hv_monitor_page *monitorpage; |
c50f7fb2 HZ |
131 | u8 monitor_group = (u8)channel->offermsg.monitorid / 32; |
132 | u8 monitor_offset = (u8)channel->offermsg.monitorid % 32; | |
454f18a9 | 133 | /* u32 monitorBit = 1 << monitorOffset; */ |
3e7ee490 | 134 | |
c50f7fb2 HZ |
135 | debuginfo->relid = channel->offermsg.child_relid; |
136 | debuginfo->state = channel->state; | |
137 | memcpy(&debuginfo->interfacetype, | |
767dff68 | 138 | &channel->offermsg.offer.if_type, sizeof(struct hv_guid)); |
c50f7fb2 | 139 | memcpy(&debuginfo->interface_instance, |
767dff68 | 140 | &channel->offermsg.offer.if_instance, |
f4266e34 | 141 | sizeof(struct hv_guid)); |
3e7ee490 | 142 | |
da9fcb72 | 143 | monitorpage = (struct hv_monitor_page *)vmbus_connection.monitor_pages; |
3e7ee490 | 144 | |
c50f7fb2 | 145 | debuginfo->monitorid = channel->offermsg.monitorid; |
3e7ee490 | 146 | |
c50f7fb2 | 147 | debuginfo->servermonitor_pending = |
f6feebe0 | 148 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 149 | debuginfo->servermonitor_latency = |
f6feebe0 | 150 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 151 | debuginfo->servermonitor_connectionid = |
f6feebe0 HZ |
152 | monitorpage->parameter[monitor_group] |
153 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 154 | |
39d70a4a | 155 | monitorpage++; |
3e7ee490 | 156 | |
c50f7fb2 | 157 | debuginfo->clientmonitor_pending = |
f6feebe0 | 158 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 159 | debuginfo->clientmonitor_latency = |
f6feebe0 | 160 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 161 | debuginfo->clientmonitor_connectionid = |
f6feebe0 HZ |
162 | monitorpage->parameter[monitor_group] |
163 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 164 | |
1ac58644 HZ |
165 | ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound); |
166 | ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound); | |
3e7ee490 HJ |
167 | } |
168 | ||
3e189519 | 169 | /* |
fff41b2e | 170 | * vmbus_open - Open the specified channel. |
f4266e34 | 171 | */ |
fff41b2e | 172 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
173 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
174 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 175 | { |
82250213 | 176 | struct vmbus_channel_open_channel *openMsg; |
b94ef345 | 177 | struct vmbus_channel_msginfo *openInfo = NULL; |
3e7ee490 | 178 | void *in, *out; |
dd0813b6 | 179 | unsigned long flags; |
c3bf2e26 | 180 | int ret, err = 0; |
3e7ee490 | 181 | |
454f18a9 | 182 | /* Aligned to page size */ |
0ace247e BP |
183 | /* ASSERT(!(SendRingBufferSize & (PAGE_SIZE - 1))); */ |
184 | /* ASSERT(!(RecvRingBufferSize & (PAGE_SIZE - 1))); */ | |
3e7ee490 | 185 | |
c50f7fb2 HZ |
186 | newchannel->onchannel_callback = onchannelcallback; |
187 | newchannel->channel_callback_context = context; | |
3e7ee490 | 188 | |
454f18a9 | 189 | /* Allocate the ring buffer */ |
df3493e0 S |
190 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
191 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
192 | ||
7e052d98 BP |
193 | if (!out) |
194 | return -ENOMEM; | |
195 | ||
0ace247e | 196 | /* ASSERT(((unsigned long)out & (PAGE_SIZE-1)) == 0); */ |
3e7ee490 | 197 | |
39d70a4a | 198 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 199 | |
c50f7fb2 HZ |
200 | newchannel->ringbuffer_pages = out; |
201 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 202 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 203 | |
72a95cbc S |
204 | ret = hv_ringbuffer_init( |
205 | &newchannel->outbound, out, send_ringbuffer_size); | |
206 | ||
fd4dc88e | 207 | if (ret != 0) { |
3324fb40 BP |
208 | err = ret; |
209 | goto errorout; | |
210 | } | |
211 | ||
72a95cbc S |
212 | ret = hv_ringbuffer_init( |
213 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 214 | if (ret != 0) { |
3324fb40 BP |
215 | err = ret; |
216 | goto errorout; | |
217 | } | |
3e7ee490 | 218 | |
3e7ee490 | 219 | |
454f18a9 | 220 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 221 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 222 | |
fff41b2e | 223 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 224 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
225 | send_ringbuffer_size + |
226 | recv_ringbuffer_size, | |
c50f7fb2 | 227 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 228 | |
fd4dc88e | 229 | if (ret != 0) { |
b94ef345 BP |
230 | err = ret; |
231 | goto errorout; | |
232 | } | |
f4266e34 | 233 | |
454f18a9 | 234 | /* Create and init the channel open message */ |
f4266e34 GKH |
235 | openInfo = kmalloc(sizeof(*openInfo) + |
236 | sizeof(struct vmbus_channel_open_channel), | |
237 | GFP_KERNEL); | |
c3bf2e26 BP |
238 | if (!openInfo) { |
239 | err = -ENOMEM; | |
240 | goto errorout; | |
241 | } | |
3e7ee490 | 242 | |
0c3b7b2f | 243 | init_waitqueue_head(&openInfo->waitevent); |
3e7ee490 | 244 | |
c50f7fb2 HZ |
245 | openMsg = (struct vmbus_channel_open_channel *)openInfo->msg; |
246 | openMsg->header.msgtype = CHANNELMSG_OPENCHANNEL; | |
247 | openMsg->openid = newchannel->offermsg.child_relid; /* FIXME */ | |
248 | openMsg->child_relid = newchannel->offermsg.child_relid; | |
249 | openMsg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
250 | openMsg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 251 | PAGE_SHIFT; |
c50f7fb2 | 252 | openMsg->server_contextarea_gpadlhandle = 0; /* TODO */ |
3e7ee490 | 253 | |
39d70a4a | 254 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 BP |
255 | err = -EINVAL; |
256 | goto errorout; | |
257 | } | |
258 | ||
39d70a4a | 259 | if (userdatalen) |
c50f7fb2 | 260 | memcpy(openMsg->userdata, userdata, userdatalen); |
3e7ee490 | 261 | |
15b2f647 | 262 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 263 | list_add_tail(&openInfo->msglistentry, |
da9fcb72 | 264 | &vmbus_connection.chn_msg_list); |
15b2f647 | 265 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 266 | |
c6977677 | 267 | ret = vmbus_post_msg(openMsg, |
f4266e34 | 268 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 HJ |
269 | |
270 | if (ret != 0) | |
3e7ee490 | 271 | goto Cleanup; |
3e7ee490 | 272 | |
0c3b7b2f S |
273 | openInfo->wait_condition = 0; |
274 | wait_event_timeout(openInfo->waitevent, | |
275 | openInfo->wait_condition, | |
276 | msecs_to_jiffies(1000)); | |
277 | if (openInfo->wait_condition == 0) { | |
278 | err = -ETIMEDOUT; | |
279 | goto errorout; | |
280 | } | |
281 | ||
3e7ee490 | 282 | |
98e08702 HJ |
283 | if (openInfo->response.open_result.status) |
284 | err = openInfo->response.open_result.status; | |
3e7ee490 HJ |
285 | |
286 | Cleanup: | |
15b2f647 | 287 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 288 | list_del(&openInfo->msglistentry); |
15b2f647 | 289 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 290 | |
8c69f52a | 291 | kfree(openInfo); |
98e08702 | 292 | return err; |
c3bf2e26 BP |
293 | |
294 | errorout: | |
2dba688b S |
295 | hv_ringbuffer_cleanup(&newchannel->outbound); |
296 | hv_ringbuffer_cleanup(&newchannel->inbound); | |
df3493e0 S |
297 | free_pages((unsigned long)out, |
298 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
c3bf2e26 BP |
299 | kfree(openInfo); |
300 | return err; | |
3e7ee490 | 301 | } |
36ceadfc | 302 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 303 | |
3e189519 | 304 | /* |
fff41b2e | 305 | * dump_gpadl_body - Dump the gpadl body message to the console for |
3e189519 | 306 | * debugging purposes. |
f4266e34 | 307 | */ |
fff41b2e | 308 | static void dump_gpadl_body(struct vmbus_channel_gpadl_body *gpadl, u32 len) |
3e7ee490 | 309 | { |
f4266e34 | 310 | int i; |
39d70a4a | 311 | int pfncount; |
3e7ee490 | 312 | |
39d70a4a | 313 | pfncount = (len - sizeof(struct vmbus_channel_gpadl_body)) / |
f4266e34 | 314 | sizeof(u64); |
98e08702 | 315 | |
39d70a4a | 316 | DPRINT_DBG(VMBUS, "gpadl body - len %d pfn count %d", len, pfncount); |
3e7ee490 | 317 | |
39d70a4a | 318 | for (i = 0; i < pfncount; i++) |
f4266e34 | 319 | DPRINT_DBG(VMBUS, "gpadl body - %d) pfn %llu", |
c50f7fb2 | 320 | i, gpadl->pfn[i]); |
3e7ee490 HJ |
321 | } |
322 | ||
3e189519 | 323 | /* |
fff41b2e | 324 | * dump_gpadl_header - Dump the gpadl header message to the console for |
3e189519 | 325 | * debugging purposes. |
f4266e34 | 326 | */ |
fff41b2e | 327 | static void dump_gpadl_header(struct vmbus_channel_gpadl_header *gpadl) |
3e7ee490 | 328 | { |
f4266e34 | 329 | int i, j; |
39d70a4a | 330 | int pagecount; |
3e7ee490 | 331 | |
f4266e34 GKH |
332 | DPRINT_DBG(VMBUS, |
333 | "gpadl header - relid %d, range count %d, range buflen %d", | |
c50f7fb2 HZ |
334 | gpadl->child_relid, gpadl->rangecount, gpadl->range_buflen); |
335 | for (i = 0; i < gpadl->rangecount; i++) { | |
415f2287 | 336 | pagecount = gpadl->range[i].byte_count >> PAGE_SHIFT; |
39d70a4a | 337 | pagecount = (pagecount > 26) ? 26 : pagecount; |
3e7ee490 | 338 | |
f4266e34 | 339 | DPRINT_DBG(VMBUS, "gpadl range %d - len %d offset %d " |
415f2287 HZ |
340 | "page count %d", i, gpadl->range[i].byte_count, |
341 | gpadl->range[i].byte_offset, pagecount); | |
3e7ee490 | 342 | |
39d70a4a | 343 | for (j = 0; j < pagecount; j++) |
f4266e34 | 344 | DPRINT_DBG(VMBUS, "%d) pfn %llu", j, |
415f2287 | 345 | gpadl->range[i].pfn_array[j]); |
3e7ee490 HJ |
346 | } |
347 | } | |
348 | ||
3e189519 | 349 | /* |
fff41b2e | 350 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 351 | */ |
fff41b2e | 352 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
353 | struct vmbus_channel_msginfo **msginfo, |
354 | u32 *messagecount) | |
3e7ee490 HJ |
355 | { |
356 | int i; | |
39d70a4a | 357 | int pagecount; |
f4266e34 | 358 | unsigned long long pfn; |
39d70a4a HZ |
359 | struct vmbus_channel_gpadl_header *gpadl_header; |
360 | struct vmbus_channel_gpadl_body *gpadl_body; | |
361 | struct vmbus_channel_msginfo *msgheader; | |
362 | struct vmbus_channel_msginfo *msgbody = NULL; | |
363 | u32 msgsize; | |
3e7ee490 | 364 | |
39d70a4a | 365 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 366 | |
f4266e34 | 367 | /* ASSERT((kbuffer & (PAGE_SIZE-1)) == 0); */ |
0ace247e | 368 | /* ASSERT((Size & (PAGE_SIZE-1)) == 0); */ |
3e7ee490 | 369 | |
39d70a4a HZ |
370 | pagecount = size >> PAGE_SHIFT; |
371 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; | |
3e7ee490 | 372 | |
454f18a9 | 373 | /* do we need a gpadl body msg */ |
39d70a4a | 374 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
375 | sizeof(struct vmbus_channel_gpadl_header) - |
376 | sizeof(struct gpa_range); | |
39d70a4a | 377 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 378 | |
39d70a4a | 379 | if (pagecount > pfncount) { |
f4266e34 | 380 | /* we need a gpadl body */ |
454f18a9 | 381 | /* fill in the header */ |
39d70a4a | 382 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 383 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
384 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
385 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
386 | if (!msgheader) | |
d1c250bb | 387 | goto nomem; |
3e7ee490 | 388 | |
c50f7fb2 HZ |
389 | INIT_LIST_HEAD(&msgheader->submsglist); |
390 | msgheader->msgsize = msgsize; | |
3e7ee490 | 391 | |
39d70a4a | 392 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
393 | msgheader->msg; |
394 | gpadl_header->rangecount = 1; | |
395 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 396 | pagecount * sizeof(u64); |
415f2287 HZ |
397 | gpadl_header->range[0].byte_offset = 0; |
398 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 399 | for (i = 0; i < pfncount; i++) |
415f2287 | 400 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
401 | *msginfo = msgheader; |
402 | *messagecount = 1; | |
3e7ee490 | 403 | |
39d70a4a HZ |
404 | pfnsum = pfncount; |
405 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 406 | |
454f18a9 | 407 | /* how many pfns can we fit */ |
39d70a4a | 408 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 409 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 410 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 411 | |
454f18a9 | 412 | /* fill in the body */ |
39d70a4a HZ |
413 | while (pfnleft) { |
414 | if (pfnleft > pfncount) | |
415 | pfncurr = pfncount; | |
3e7ee490 | 416 | else |
39d70a4a | 417 | pfncurr = pfnleft; |
3e7ee490 | 418 | |
39d70a4a | 419 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 420 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
421 | pfncurr * sizeof(u64); |
422 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
d1c250bb | 423 | /* FIXME: we probably need to more if this fails */ |
39d70a4a | 424 | if (!msgbody) |
d1c250bb | 425 | goto nomem; |
c50f7fb2 | 426 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
427 | (*messagecount)++; |
428 | gpadl_body = | |
c50f7fb2 | 429 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
430 | |
431 | /* | |
432 | * FIXME: | |
433 | * Gpadl is u32 and we are using a pointer which could | |
434 | * be 64-bit | |
435 | */ | |
39d70a4a HZ |
436 | /* gpadl_body->Gpadl = kbuffer; */ |
437 | for (i = 0; i < pfncurr; i++) | |
c50f7fb2 | 438 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
3e7ee490 | 439 | |
454f18a9 | 440 | /* add to msg header */ |
c50f7fb2 HZ |
441 | list_add_tail(&msgbody->msglistentry, |
442 | &msgheader->submsglist); | |
39d70a4a HZ |
443 | pfnsum += pfncurr; |
444 | pfnleft -= pfncurr; | |
3e7ee490 | 445 | } |
f4266e34 | 446 | } else { |
454f18a9 | 447 | /* everything fits in a header */ |
39d70a4a | 448 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 449 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
450 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
451 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
452 | if (msgheader == NULL) | |
e3eb7cdd | 453 | goto nomem; |
c50f7fb2 | 454 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
455 | |
456 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
457 | msgheader->msg; |
458 | gpadl_header->rangecount = 1; | |
459 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 460 | pagecount * sizeof(u64); |
415f2287 HZ |
461 | gpadl_header->range[0].byte_offset = 0; |
462 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 463 | for (i = 0; i < pagecount; i++) |
415f2287 | 464 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
465 | |
466 | *msginfo = msgheader; | |
467 | *messagecount = 1; | |
3e7ee490 HJ |
468 | } |
469 | ||
470 | return 0; | |
d1c250bb | 471 | nomem: |
39d70a4a HZ |
472 | kfree(msgheader); |
473 | kfree(msgbody); | |
d1c250bb | 474 | return -ENOMEM; |
3e7ee490 HJ |
475 | } |
476 | ||
3e189519 | 477 | /* |
fff41b2e | 478 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 479 | * |
39d70a4a HZ |
480 | * @channel: a channel |
481 | * @kbuffer: from kmalloc | |
482 | * @size: page-size multiple | |
483 | * @gpadl_handle: some funky thing | |
f4266e34 | 484 | */ |
fff41b2e | 485 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 486 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 487 | { |
39d70a4a HZ |
488 | struct vmbus_channel_gpadl_header *gpadlmsg; |
489 | struct vmbus_channel_gpadl_body *gpadl_body; | |
82250213 | 490 | /* struct vmbus_channel_gpadl_created *gpadlCreated; */ |
39d70a4a HZ |
491 | struct vmbus_channel_msginfo *msginfo = NULL; |
492 | struct vmbus_channel_msginfo *submsginfo; | |
493 | u32 msgcount; | |
53af545b | 494 | struct list_head *curr; |
39d70a4a | 495 | u32 next_gpadl_handle; |
dd0813b6 | 496 | unsigned long flags; |
c3bf2e26 | 497 | int ret = 0; |
3e7ee490 | 498 | |
da9fcb72 HZ |
499 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
500 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 501 | |
fff41b2e | 502 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
503 | if (ret) |
504 | return ret; | |
3e7ee490 | 505 | |
0c3b7b2f | 506 | init_waitqueue_head(&msginfo->waitevent); |
c3bf2e26 | 507 | |
c50f7fb2 HZ |
508 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
509 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
510 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
511 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 512 | |
fff41b2e | 513 | dump_gpadl_header(gpadlmsg); |
3e7ee490 | 514 | |
15b2f647 | 515 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 516 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 517 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 518 | |
15b2f647 | 519 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 520 | |
0c3b7b2f | 521 | msginfo->wait_condition = 0; |
c6977677 | 522 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 523 | sizeof(*msginfo)); |
98e08702 | 524 | if (ret != 0) |
3e7ee490 | 525 | goto Cleanup; |
3e7ee490 | 526 | |
39d70a4a | 527 | if (msgcount > 1) { |
c50f7fb2 | 528 | list_for_each(curr, &msginfo->submsglist) { |
53af545b BP |
529 | |
530 | /* FIXME: should this use list_entry() instead ? */ | |
39d70a4a HZ |
531 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
532 | gpadl_body = | |
c50f7fb2 | 533 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 534 | |
c50f7fb2 HZ |
535 | gpadl_body->header.msgtype = |
536 | CHANNELMSG_GPADL_BODY; | |
537 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 538 | |
c50f7fb2 | 539 | dump_gpadl_body(gpadl_body, submsginfo->msgsize - |
39d70a4a | 540 | sizeof(*submsginfo)); |
c6977677 | 541 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 542 | submsginfo->msgsize - |
39d70a4a | 543 | sizeof(*submsginfo)); |
fd4dc88e | 544 | if (ret != 0) |
99259159 BP |
545 | goto Cleanup; |
546 | ||
3e7ee490 HJ |
547 | } |
548 | } | |
0c3b7b2f S |
549 | wait_event_timeout(msginfo->waitevent, |
550 | msginfo->wait_condition, | |
551 | msecs_to_jiffies(1000)); | |
552 | BUG_ON(msginfo->wait_condition == 0); | |
553 | ||
3e7ee490 | 554 | |
454f18a9 | 555 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 556 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 HJ |
557 | |
558 | Cleanup: | |
15b2f647 | 559 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 560 | list_del(&msginfo->msglistentry); |
15b2f647 | 561 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 562 | |
39d70a4a | 563 | kfree(msginfo); |
3e7ee490 HJ |
564 | return ret; |
565 | } | |
98873724 | 566 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 567 | |
3e189519 | 568 | /* |
fff41b2e | 569 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 570 | */ |
fff41b2e | 571 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 572 | { |
82250213 | 573 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 574 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 575 | unsigned long flags; |
f4266e34 | 576 | int ret; |
3e7ee490 | 577 | |
39d70a4a | 578 | /* ASSERT(gpadl_handle != 0); */ |
3e7ee490 | 579 | |
f4266e34 GKH |
580 | info = kmalloc(sizeof(*info) + |
581 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
582 | if (!info) |
583 | return -ENOMEM; | |
3e7ee490 | 584 | |
0c3b7b2f | 585 | init_waitqueue_head(&info->waitevent); |
3e7ee490 | 586 | |
c50f7fb2 | 587 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 588 | |
c50f7fb2 HZ |
589 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
590 | msg->child_relid = channel->offermsg.child_relid; | |
591 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 592 | |
15b2f647 | 593 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 594 | list_add_tail(&info->msglistentry, |
da9fcb72 | 595 | &vmbus_connection.chn_msg_list); |
15b2f647 | 596 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
0c3b7b2f | 597 | info->wait_condition = 0; |
c6977677 | 598 | ret = vmbus_post_msg(msg, |
f4266e34 | 599 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 600 | |
0c3b7b2f S |
601 | BUG_ON(ret != 0); |
602 | wait_event_timeout(info->waitevent, | |
603 | info->wait_condition, msecs_to_jiffies(1000)); | |
604 | BUG_ON(info->wait_condition == 0); | |
3e7ee490 | 605 | |
454f18a9 | 606 | /* Received a torndown response */ |
15b2f647 | 607 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 608 | list_del(&info->msglistentry); |
15b2f647 | 609 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 610 | |
8c69f52a | 611 | kfree(info); |
3e7ee490 HJ |
612 | return ret; |
613 | } | |
18726d7a | 614 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 615 | |
3e189519 | 616 | /* |
fff41b2e | 617 | * vmbus_close - Close the specified channel |
f4266e34 | 618 | */ |
fff41b2e | 619 | void vmbus_close(struct vmbus_channel *channel) |
3e7ee490 | 620 | { |
82250213 | 621 | struct vmbus_channel_close_channel *msg; |
aded7165 | 622 | struct vmbus_channel_msginfo *info; |
0f5e44ca | 623 | unsigned long flags; |
f4266e34 | 624 | int ret; |
3e7ee490 | 625 | |
454f18a9 | 626 | /* Stop callback and cancel the timer asap */ |
c50f7fb2 | 627 | channel->onchannel_callback = NULL; |
39d70a4a | 628 | del_timer_sync(&channel->poll_timer); |
3e7ee490 | 629 | |
454f18a9 | 630 | /* Send a closing message */ |
f4266e34 GKH |
631 | info = kmalloc(sizeof(*info) + |
632 | sizeof(struct vmbus_channel_close_channel), GFP_KERNEL); | |
c3bf2e26 BP |
633 | /* FIXME: can't do anything other than return here because the |
634 | * function is void */ | |
635 | if (!info) | |
636 | return; | |
3e7ee490 | 637 | |
3e7ee490 | 638 | |
c50f7fb2 HZ |
639 | msg = (struct vmbus_channel_close_channel *)info->msg; |
640 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; | |
641 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 642 | |
c6977677 | 643 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 644 | |
0c3b7b2f | 645 | BUG_ON(ret != 0); |
454f18a9 | 646 | /* Tear down the gpadl for the channel's ring buffer */ |
c50f7fb2 | 647 | if (channel->ringbuffer_gpadlhandle) |
fff41b2e | 648 | vmbus_teardown_gpadl(channel, |
c50f7fb2 | 649 | channel->ringbuffer_gpadlhandle); |
3e7ee490 | 650 | |
454f18a9 | 651 | /* TODO: Send a msg to release the childRelId */ |
3e7ee490 | 652 | |
454f18a9 | 653 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
654 | hv_ringbuffer_cleanup(&channel->outbound); |
655 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 656 | |
df3493e0 S |
657 | free_pages((unsigned long)channel->ringbuffer_pages, |
658 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 659 | |
8c69f52a | 660 | kfree(info); |
3e7ee490 | 661 | |
454f18a9 BP |
662 | /* |
663 | * If we are closing the channel during an error path in | |
664 | * opening the channel, don't free the channel since the | |
665 | * caller will free the channel | |
666 | */ | |
667 | ||
c50f7fb2 | 668 | if (channel->state == CHANNEL_OPEN_STATE) { |
15b2f647 | 669 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
c50f7fb2 | 670 | list_del(&channel->listentry); |
15b2f647 | 671 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 672 | |
e98cb276 | 673 | free_channel(channel); |
3e7ee490 | 674 | } |
3e7ee490 | 675 | } |
70bfa307 | 676 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 677 | |
c88c4e4c | 678 | /** |
fff41b2e | 679 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
680 | * @channel: Pointer to vmbus_channel structure. |
681 | * @buffer: Pointer to the buffer you want to receive the data into. | |
682 | * @bufferlen: Maximum size of what the the buffer will hold | |
683 | * @requestid: Identifier of the request | |
684 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
685 | * packet etc. |
686 | * | |
39d70a4a | 687 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
688 | * This will send the data unparsed to hyper-v. |
689 | * | |
690 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 691 | */ |
fff41b2e | 692 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
39d70a4a HZ |
693 | u32 bufferlen, u64 requestid, |
694 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 695 | { |
8dc0a06a | 696 | struct vmpacket_descriptor desc; |
39d70a4a | 697 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 698 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
39d70a4a HZ |
699 | struct scatterlist bufferlist[3]; |
700 | u64 aligned_data = 0; | |
f4266e34 | 701 | int ret; |
3e7ee490 | 702 | |
fff41b2e | 703 | dump_vmbus_channel(channel); |
3e7ee490 | 704 | |
0ace247e | 705 | /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */ |
3e7ee490 | 706 | |
454f18a9 | 707 | /* Setup the descriptor */ |
415f2287 HZ |
708 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
709 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 710 | /* in 8-bytes granularity */ |
415f2287 HZ |
711 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
712 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
713 | desc.trans_id = requestid; | |
3e7ee490 | 714 | |
39d70a4a HZ |
715 | sg_init_table(bufferlist, 3); |
716 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); | |
717 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
718 | sg_set_buf(&bufferlist[2], &aligned_data, | |
719 | packetlen_aligned - packetlen); | |
3e7ee490 | 720 | |
633c4dce | 721 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 722 | |
454f18a9 | 723 | /* TODO: We should determine if this is optional */ |
1ac58644 | 724 | if (ret == 0 && !get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 725 | vmbus_setevent(channel); |
3e7ee490 | 726 | |
3e7ee490 HJ |
727 | return ret; |
728 | } | |
fff41b2e | 729 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 730 | |
3e189519 | 731 | /* |
fff41b2e | 732 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 733 | * packets using a GPADL Direct packet type. |
f4266e34 | 734 | */ |
fff41b2e | 735 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
736 | struct hv_page_buffer pagebuffers[], |
737 | u32 pagecount, void *buffer, u32 bufferlen, | |
738 | u64 requestid) | |
3e7ee490 | 739 | { |
f4266e34 GKH |
740 | int ret; |
741 | int i; | |
430a8e9a | 742 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
743 | u32 descsize; |
744 | u32 packetlen; | |
745 | u32 packetlen_aligned; | |
746 | struct scatterlist bufferlist[3]; | |
747 | u64 aligned_data = 0; | |
3e7ee490 | 748 | |
39d70a4a | 749 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 750 | return -EINVAL; |
3e7ee490 | 751 | |
fff41b2e | 752 | dump_vmbus_channel(channel); |
3e7ee490 | 753 | |
f4266e34 | 754 | /* |
430a8e9a | 755 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
756 | * largest size we support |
757 | */ | |
39d70a4a HZ |
758 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
759 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 760 | sizeof(struct hv_page_buffer)); |
39d70a4a | 761 | packetlen = descsize + bufferlen; |
73509681 | 762 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 763 | |
0ace247e | 764 | /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */ |
3e7ee490 | 765 | |
454f18a9 | 766 | /* Setup the descriptor */ |
415f2287 | 767 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 768 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
769 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
770 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
771 | desc.transactionid = requestid; | |
772 | desc.rangecount = pagecount; | |
773 | ||
774 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
775 | desc.range[i].len = pagebuffers[i].len; |
776 | desc.range[i].offset = pagebuffers[i].offset; | |
777 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
778 | } |
779 | ||
39d70a4a HZ |
780 | sg_init_table(bufferlist, 3); |
781 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
782 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
783 | sg_set_buf(&bufferlist[2], &aligned_data, | |
784 | packetlen_aligned - packetlen); | |
3e7ee490 | 785 | |
633c4dce | 786 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 787 | |
454f18a9 | 788 | /* TODO: We should determine if this is optional */ |
1ac58644 | 789 | if (ret == 0 && !get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 790 | vmbus_setevent(channel); |
3e7ee490 | 791 | |
3e7ee490 HJ |
792 | return ret; |
793 | } | |
713efeb4 | 794 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 795 | |
3e189519 | 796 | /* |
fff41b2e | 797 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 798 | * using a GPADL Direct packet type. |
f4266e34 | 799 | */ |
fff41b2e | 800 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
801 | struct hv_multipage_buffer *multi_pagebuffer, |
802 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 803 | { |
f4266e34 | 804 | int ret; |
430a8e9a | 805 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
806 | u32 descsize; |
807 | u32 packetlen; | |
808 | u32 packetlen_aligned; | |
809 | struct scatterlist bufferlist[3]; | |
810 | u64 aligned_data = 0; | |
ca623ad3 HZ |
811 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
812 | multi_pagebuffer->len); | |
3e7ee490 | 813 | |
fff41b2e | 814 | dump_vmbus_channel(channel); |
3e7ee490 | 815 | |
39d70a4a | 816 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 817 | return -EINVAL; |
3e7ee490 | 818 | |
f4266e34 | 819 | /* |
430a8e9a | 820 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
821 | * the largest size we support |
822 | */ | |
39d70a4a HZ |
823 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
824 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 825 | sizeof(u64)); |
39d70a4a | 826 | packetlen = descsize + bufferlen; |
73509681 | 827 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 828 | |
0ace247e | 829 | /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */ |
3e7ee490 | 830 | |
454f18a9 | 831 | /* Setup the descriptor */ |
415f2287 | 832 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 833 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
834 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
835 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
836 | desc.transactionid = requestid; | |
430a8e9a | 837 | desc.rangecount = 1; |
3e7ee490 | 838 | |
ca623ad3 HZ |
839 | desc.range.len = multi_pagebuffer->len; |
840 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 841 | |
ca623ad3 | 842 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 843 | pfncount * sizeof(u64)); |
3e7ee490 | 844 | |
39d70a4a HZ |
845 | sg_init_table(bufferlist, 3); |
846 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
847 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
848 | sg_set_buf(&bufferlist[2], &aligned_data, | |
849 | packetlen_aligned - packetlen); | |
3e7ee490 | 850 | |
633c4dce | 851 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 852 | |
454f18a9 | 853 | /* TODO: We should determine if this is optional */ |
1ac58644 | 854 | if (ret == 0 && !get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 855 | vmbus_setevent(channel); |
3e7ee490 | 856 | |
3e7ee490 HJ |
857 | return ret; |
858 | } | |
4cb106fa | 859 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
860 | |
861 | /** | |
fff41b2e | 862 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
863 | * @channel: Pointer to vmbus_channel structure. |
864 | * @buffer: Pointer to the buffer you want to receive the data into. | |
865 | * @bufferlen: Maximum size of what the the buffer will hold | |
866 | * @buffer_actual_len: The actual size of the data after it was received | |
867 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
868 | * |
869 | * Receives directly from the hyper-v vmbus and puts the data it received | |
870 | * into Buffer. This will receive the data unparsed from hyper-v. | |
871 | * | |
872 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 873 | */ |
fff41b2e | 874 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 875 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 876 | { |
8dc0a06a | 877 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
878 | u32 packetlen; |
879 | u32 userlen; | |
3e7ee490 | 880 | int ret; |
54411c42 | 881 | unsigned long flags; |
3e7ee490 | 882 | |
39d70a4a HZ |
883 | *buffer_actual_len = 0; |
884 | *requestid = 0; | |
3e7ee490 | 885 | |
39d70a4a | 886 | spin_lock_irqsave(&channel->inbound_lock, flags); |
3e7ee490 | 887 | |
a89186c2 | 888 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 GKH |
889 | sizeof(struct vmpacket_descriptor)); |
890 | if (ret != 0) { | |
39d70a4a | 891 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 HJ |
892 | return 0; |
893 | } | |
894 | ||
454f18a9 | 895 | /* VmbusChannelClearEvent(Channel); */ |
3e7ee490 | 896 | |
415f2287 HZ |
897 | packetlen = desc.len8 << 3; |
898 | userlen = packetlen - (desc.offset8 << 3); | |
454f18a9 | 899 | /* ASSERT(userLen > 0); */ |
3e7ee490 | 900 | |
39d70a4a | 901 | *buffer_actual_len = userlen; |
3e7ee490 | 902 | |
39d70a4a HZ |
903 | if (userlen > bufferlen) { |
904 | spin_unlock_irqrestore(&channel->inbound_lock, flags); | |
3e7ee490 | 905 | |
0a46618d | 906 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 907 | bufferlen, userlen); |
3e7ee490 HJ |
908 | return -1; |
909 | } | |
910 | ||
415f2287 | 911 | *requestid = desc.trans_id; |
3e7ee490 | 912 | |
454f18a9 | 913 | /* Copy over the packet to the user buffer */ |
1ac58644 | 914 | ret = ringbuffer_read(&channel->inbound, buffer, userlen, |
415f2287 | 915 | (desc.offset8 << 3)); |
3e7ee490 | 916 | |
39d70a4a | 917 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 | 918 | |
3e7ee490 HJ |
919 | return 0; |
920 | } | |
fff41b2e | 921 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 922 | |
3e189519 | 923 | /* |
fff41b2e | 924 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 925 | */ |
fff41b2e | 926 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
927 | u32 bufferlen, u32 *buffer_actual_len, |
928 | u64 *requestid) | |
3e7ee490 | 929 | { |
8dc0a06a | 930 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
931 | u32 packetlen; |
932 | u32 userlen; | |
3e7ee490 | 933 | int ret; |
54411c42 | 934 | unsigned long flags; |
3e7ee490 | 935 | |
39d70a4a HZ |
936 | *buffer_actual_len = 0; |
937 | *requestid = 0; | |
3e7ee490 | 938 | |
39d70a4a | 939 | spin_lock_irqsave(&channel->inbound_lock, flags); |
3e7ee490 | 940 | |
a89186c2 | 941 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 GKH |
942 | sizeof(struct vmpacket_descriptor)); |
943 | if (ret != 0) { | |
39d70a4a | 944 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 HJ |
945 | return 0; |
946 | } | |
947 | ||
454f18a9 | 948 | /* VmbusChannelClearEvent(Channel); */ |
3e7ee490 | 949 | |
415f2287 HZ |
950 | packetlen = desc.len8 << 3; |
951 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 952 | |
39d70a4a | 953 | *buffer_actual_len = packetlen; |
3e7ee490 | 954 | |
39d70a4a HZ |
955 | if (packetlen > bufferlen) { |
956 | spin_unlock_irqrestore(&channel->inbound_lock, flags); | |
3e7ee490 | 957 | |
0a46618d HJ |
958 | pr_err("Buffer too small - needed %d bytes but " |
959 | "got space for only %d bytes\n", | |
960 | packetlen, bufferlen); | |
3e7ee490 HJ |
961 | return -2; |
962 | } | |
963 | ||
415f2287 | 964 | *requestid = desc.trans_id; |
3e7ee490 | 965 | |
454f18a9 | 966 | /* Copy over the entire packet to the user buffer */ |
1ac58644 | 967 | ret = ringbuffer_read(&channel->inbound, buffer, packetlen, 0); |
3e7ee490 | 968 | |
39d70a4a | 969 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 HJ |
970 | return 0; |
971 | } | |
adaee6bd | 972 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |
3e7ee490 | 973 | |
3e189519 | 974 | /* |
fff41b2e | 975 | * vmbus_onchannel_event - Channel event callback |
f4266e34 | 976 | */ |
fff41b2e | 977 | void vmbus_onchannel_event(struct vmbus_channel *channel) |
3e7ee490 | 978 | { |
fff41b2e | 979 | dump_vmbus_channel(channel); |
0ace247e | 980 | /* ASSERT(Channel->OnChannelCallback); */ |
5996b3dd | 981 | |
c50f7fb2 | 982 | channel->onchannel_callback(channel->channel_callback_context); |
5996b3dd | 983 | |
39d70a4a | 984 | mod_timer(&channel->poll_timer, jiffies + usecs_to_jiffies(100)); |
3e7ee490 HJ |
985 | } |
986 | ||
3e189519 | 987 | /* |
fff41b2e | 988 | * vmbus_ontimer - Timer event callback |
f4266e34 | 989 | */ |
fff41b2e | 990 | void vmbus_ontimer(unsigned long data) |
3e7ee490 | 991 | { |
aded7165 | 992 | struct vmbus_channel *channel = (struct vmbus_channel *)data; |
3e7ee490 | 993 | |
c50f7fb2 HZ |
994 | if (channel->onchannel_callback) |
995 | channel->onchannel_callback(channel->channel_callback_context); | |
3e7ee490 HJ |
996 | } |
997 | ||
3e189519 | 998 | /* |
fff41b2e | 999 | * dump_vmbus_channel- Dump vmbus channel info to the console |
f4266e34 | 1000 | */ |
fff41b2e | 1001 | static void dump_vmbus_channel(struct vmbus_channel *channel) |
3e7ee490 | 1002 | { |
c50f7fb2 | 1003 | DPRINT_DBG(VMBUS, "Channel (%d)", channel->offermsg.child_relid); |
1ac58644 HZ |
1004 | dump_ring_info(&channel->outbound, "Outbound "); |
1005 | dump_ring_info(&channel->inbound, "Inbound "); | |
3e7ee490 | 1006 | } |