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01325476 S |
1 | /* |
2 | * An implementation of file copy service. | |
3 | * | |
4 | * Copyright (C) 2014, Microsoft, Inc. | |
5 | * | |
6 | * Author : K. Y. Srinivasan <ksrinivasan@novell.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License version 2 as published | |
10 | * by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
15 | * NON INFRINGEMENT. See the GNU General Public License for more | |
16 | * details. | |
17 | * | |
18 | */ | |
19 | ||
20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
21 | ||
01325476 S |
22 | #include <linux/nls.h> |
23 | #include <linux/workqueue.h> | |
01325476 S |
24 | #include <linux/hyperv.h> |
25 | #include <linux/sched.h> | |
01325476 S |
26 | |
27 | #include "hyperv_vmbus.h" | |
c7e490fc | 28 | #include "hv_utils_transport.h" |
01325476 S |
29 | |
30 | #define WIN8_SRV_MAJOR 1 | |
31 | #define WIN8_SRV_MINOR 1 | |
32 | #define WIN8_SRV_VERSION (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR) | |
33 | ||
a1656454 AN |
34 | #define FCOPY_VER_COUNT 1 |
35 | static const int fcopy_versions[] = { | |
36 | WIN8_SRV_VERSION | |
37 | }; | |
38 | ||
39 | #define FW_VER_COUNT 1 | |
40 | static const int fw_versions[] = { | |
41 | UTIL_FW_VERSION | |
42 | }; | |
43 | ||
01325476 S |
44 | /* |
45 | * Global state maintained for transaction that is being processed. | |
46 | * For a class of integration services, including the "file copy service", | |
47 | * the specified protocol is a "request/response" protocol which means that | |
48 | * there can only be single outstanding transaction from the host at any | |
49 | * given point in time. We use this to simplify memory management in this | |
50 | * driver - we cache and process only one message at a time. | |
51 | * | |
52 | * While the request/response protocol is guaranteed by the host, we further | |
53 | * ensure this by serializing packet processing in this driver - we do not | |
54 | * read additional packets from the VMBUs until the current packet is fully | |
55 | * handled. | |
01325476 S |
56 | */ |
57 | ||
58 | static struct { | |
4c93cccc | 59 | int state; /* hvutil_device_state */ |
01325476 S |
60 | int recv_len; /* number of bytes received. */ |
61 | struct hv_fcopy_hdr *fcopy_msg; /* current message */ | |
01325476 S |
62 | struct vmbus_channel *recv_channel; /* chn we got the request */ |
63 | u64 recv_req_id; /* request ID. */ | |
01325476 S |
64 | } fcopy_transaction; |
65 | ||
01325476 | 66 | static void fcopy_respond_to_host(int error); |
c7e490fc | 67 | static void fcopy_send_data(struct work_struct *dummy); |
1d072339 VK |
68 | static void fcopy_timeout_func(struct work_struct *dummy); |
69 | static DECLARE_DELAYED_WORK(fcopy_timeout_work, fcopy_timeout_func); | |
c7e490fc VK |
70 | static DECLARE_WORK(fcopy_send_work, fcopy_send_data); |
71 | static const char fcopy_devname[] = "vmbus/hv_fcopy"; | |
01325476 | 72 | static u8 *recv_buffer; |
c7e490fc | 73 | static struct hvutil_transport *hvt; |
20951c75 | 74 | static struct completion release_event; |
a4d1ee5b VK |
75 | /* |
76 | * This state maintains the version number registered by the daemon. | |
77 | */ | |
78 | static int dm_reg_value; | |
01325476 | 79 | |
3cace4a6 OH |
80 | static void fcopy_poll_wrapper(void *channel) |
81 | { | |
82 | /* Transaction is finished, reset the state here to avoid races. */ | |
83 | fcopy_transaction.state = HVUTIL_READY; | |
84 | hv_fcopy_onchannelcallback(channel); | |
85 | } | |
86 | ||
1d072339 | 87 | static void fcopy_timeout_func(struct work_struct *dummy) |
01325476 S |
88 | { |
89 | /* | |
90 | * If the timer fires, the user-mode component has not responded; | |
91 | * process the pending transaction. | |
92 | */ | |
93 | fcopy_respond_to_host(HV_E_FAIL); | |
3cace4a6 | 94 | hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper); |
01325476 S |
95 | } |
96 | ||
e0fa3e5e VK |
97 | static void fcopy_register_done(void) |
98 | { | |
99 | pr_debug("FCP: userspace daemon registered\n"); | |
100 | hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper); | |
101 | } | |
102 | ||
01325476 S |
103 | static int fcopy_handle_handshake(u32 version) |
104 | { | |
a4d1ee5b VK |
105 | u32 our_ver = FCOPY_CURRENT_VERSION; |
106 | ||
01325476 | 107 | switch (version) { |
a4d1ee5b VK |
108 | case FCOPY_VERSION_0: |
109 | /* Daemon doesn't expect us to reply */ | |
110 | dm_reg_value = version; | |
111 | break; | |
112 | case FCOPY_VERSION_1: | |
113 | /* Daemon expects us to reply with our own version */ | |
e0fa3e5e VK |
114 | if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver), |
115 | fcopy_register_done)) | |
a4d1ee5b VK |
116 | return -EFAULT; |
117 | dm_reg_value = version; | |
01325476 S |
118 | break; |
119 | default: | |
120 | /* | |
121 | * For now we will fail the registration. | |
122 | * If and when we have multiple versions to | |
123 | * deal with, we will be backward compatible. | |
124 | * We will add this code when needed. | |
125 | */ | |
126 | return -EINVAL; | |
127 | } | |
e0fa3e5e | 128 | pr_debug("FCP: userspace daemon ver. %d connected\n", version); |
01325476 S |
129 | return 0; |
130 | } | |
131 | ||
c7e490fc | 132 | static void fcopy_send_data(struct work_struct *dummy) |
01325476 | 133 | { |
25ef06fe | 134 | struct hv_start_fcopy *smsg_out = NULL; |
01325476 S |
135 | int operation = fcopy_transaction.fcopy_msg->operation; |
136 | struct hv_start_fcopy *smsg_in; | |
c7e490fc VK |
137 | void *out_src; |
138 | int rc, out_len; | |
01325476 S |
139 | |
140 | /* | |
141 | * The strings sent from the host are encoded in | |
142 | * in utf16; convert it to utf8 strings. | |
143 | * The host assures us that the utf16 strings will not exceed | |
144 | * the max lengths specified. We will however, reserve room | |
145 | * for the string terminating character - in the utf16s_utf8s() | |
146 | * function we limit the size of the buffer where the converted | |
147 | * string is placed to W_MAX_PATH -1 to guarantee | |
148 | * that the strings can be properly terminated! | |
149 | */ | |
150 | ||
151 | switch (operation) { | |
152 | case START_FILE_COPY: | |
c7e490fc | 153 | out_len = sizeof(struct hv_start_fcopy); |
25ef06fe VK |
154 | smsg_out = kzalloc(sizeof(*smsg_out), GFP_KERNEL); |
155 | if (!smsg_out) | |
156 | return; | |
157 | ||
158 | smsg_out->hdr.operation = operation; | |
01325476 S |
159 | smsg_in = (struct hv_start_fcopy *)fcopy_transaction.fcopy_msg; |
160 | ||
161 | utf16s_to_utf8s((wchar_t *)smsg_in->file_name, W_MAX_PATH, | |
162 | UTF16_LITTLE_ENDIAN, | |
25ef06fe | 163 | (__u8 *)&smsg_out->file_name, W_MAX_PATH - 1); |
01325476 S |
164 | |
165 | utf16s_to_utf8s((wchar_t *)smsg_in->path_name, W_MAX_PATH, | |
166 | UTF16_LITTLE_ENDIAN, | |
25ef06fe | 167 | (__u8 *)&smsg_out->path_name, W_MAX_PATH - 1); |
01325476 | 168 | |
25ef06fe VK |
169 | smsg_out->copy_flags = smsg_in->copy_flags; |
170 | smsg_out->file_size = smsg_in->file_size; | |
171 | out_src = smsg_out; | |
01325476 S |
172 | break; |
173 | ||
174 | default: | |
c7e490fc VK |
175 | out_src = fcopy_transaction.fcopy_msg; |
176 | out_len = fcopy_transaction.recv_len; | |
01325476 S |
177 | break; |
178 | } | |
c7e490fc VK |
179 | |
180 | fcopy_transaction.state = HVUTIL_USERSPACE_REQ; | |
e0fa3e5e | 181 | rc = hvutil_transport_send(hvt, out_src, out_len, NULL); |
c7e490fc VK |
182 | if (rc) { |
183 | pr_debug("FCP: failed to communicate to the daemon: %d\n", rc); | |
184 | if (cancel_delayed_work_sync(&fcopy_timeout_work)) { | |
185 | fcopy_respond_to_host(HV_E_FAIL); | |
186 | fcopy_transaction.state = HVUTIL_READY; | |
187 | } | |
188 | } | |
25ef06fe VK |
189 | kfree(smsg_out); |
190 | ||
01325476 S |
191 | return; |
192 | } | |
193 | ||
194 | /* | |
195 | * Send a response back to the host. | |
196 | */ | |
197 | ||
198 | static void | |
199 | fcopy_respond_to_host(int error) | |
200 | { | |
201 | struct icmsg_hdr *icmsghdr; | |
202 | u32 buf_len; | |
203 | struct vmbus_channel *channel; | |
204 | u64 req_id; | |
205 | ||
206 | /* | |
207 | * Copy the global state for completing the transaction. Note that | |
208 | * only one transaction can be active at a time. This is guaranteed | |
209 | * by the file copy protocol implemented by the host. Furthermore, | |
210 | * the "transaction active" state we maintain ensures that there can | |
211 | * only be one active transaction at a time. | |
212 | */ | |
213 | ||
214 | buf_len = fcopy_transaction.recv_len; | |
215 | channel = fcopy_transaction.recv_channel; | |
216 | req_id = fcopy_transaction.recv_req_id; | |
217 | ||
01325476 S |
218 | icmsghdr = (struct icmsg_hdr *) |
219 | &recv_buffer[sizeof(struct vmbuspipe_hdr)]; | |
220 | ||
221 | if (channel->onchannel_callback == NULL) | |
222 | /* | |
223 | * We have raced with util driver being unloaded; | |
224 | * silently return. | |
225 | */ | |
226 | return; | |
227 | ||
228 | icmsghdr->status = error; | |
229 | icmsghdr->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE; | |
230 | vmbus_sendpacket(channel, recv_buffer, buf_len, req_id, | |
231 | VM_PKT_DATA_INBAND, 0); | |
232 | } | |
233 | ||
234 | void hv_fcopy_onchannelcallback(void *context) | |
235 | { | |
236 | struct vmbus_channel *channel = context; | |
237 | u32 recvlen; | |
238 | u64 requestid; | |
239 | struct hv_fcopy_hdr *fcopy_msg; | |
240 | struct icmsg_hdr *icmsghdr; | |
01325476 S |
241 | int fcopy_srv_version; |
242 | ||
3cace4a6 | 243 | if (fcopy_transaction.state > HVUTIL_READY) |
01325476 | 244 | return; |
01325476 S |
245 | |
246 | vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 2, &recvlen, | |
247 | &requestid); | |
248 | if (recvlen <= 0) | |
249 | return; | |
250 | ||
251 | icmsghdr = (struct icmsg_hdr *)&recv_buffer[ | |
252 | sizeof(struct vmbuspipe_hdr)]; | |
253 | if (icmsghdr->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
1274a690 | 254 | if (vmbus_prep_negotiate_resp(icmsghdr, recv_buffer, |
a1656454 AN |
255 | fw_versions, FW_VER_COUNT, |
256 | fcopy_versions, FCOPY_VER_COUNT, | |
1274a690 AN |
257 | NULL, &fcopy_srv_version)) { |
258 | ||
259 | pr_info("FCopy IC version %d.%d\n", | |
260 | fcopy_srv_version >> 16, | |
261 | fcopy_srv_version & 0xFFFF); | |
262 | } | |
01325476 S |
263 | } else { |
264 | fcopy_msg = (struct hv_fcopy_hdr *)&recv_buffer[ | |
265 | sizeof(struct vmbuspipe_hdr) + | |
266 | sizeof(struct icmsg_hdr)]; | |
267 | ||
268 | /* | |
269 | * Stash away this global state for completing the | |
270 | * transaction; note transactions are serialized. | |
271 | */ | |
272 | ||
01325476 | 273 | fcopy_transaction.recv_len = recvlen; |
01325476 S |
274 | fcopy_transaction.recv_req_id = requestid; |
275 | fcopy_transaction.fcopy_msg = fcopy_msg; | |
276 | ||
4c93cccc VK |
277 | if (fcopy_transaction.state < HVUTIL_READY) { |
278 | /* Userspace is not registered yet */ | |
279 | fcopy_respond_to_host(HV_E_FAIL); | |
280 | return; | |
281 | } | |
282 | fcopy_transaction.state = HVUTIL_HOSTMSG_RECEIVED; | |
283 | ||
01325476 S |
284 | /* |
285 | * Send the information to the user-level daemon. | |
286 | */ | |
c7e490fc | 287 | schedule_work(&fcopy_send_work); |
c0b200cf S |
288 | schedule_delayed_work(&fcopy_timeout_work, |
289 | HV_UTIL_TIMEOUT * HZ); | |
01325476 S |
290 | return; |
291 | } | |
292 | icmsghdr->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE; | |
293 | vmbus_sendpacket(channel, recv_buffer, recvlen, requestid, | |
294 | VM_PKT_DATA_INBAND, 0); | |
295 | } | |
296 | ||
c7e490fc VK |
297 | /* Callback when data is received from userspace */ |
298 | static int fcopy_on_msg(void *msg, int len) | |
01325476 | 299 | { |
c7e490fc | 300 | int *val = (int *)msg; |
01325476 | 301 | |
c7e490fc | 302 | if (len != sizeof(int)) |
01325476 S |
303 | return -EINVAL; |
304 | ||
c7e490fc VK |
305 | if (fcopy_transaction.state == HVUTIL_DEVICE_INIT) |
306 | return fcopy_handle_handshake(*val); | |
01325476 | 307 | |
4c93cccc VK |
308 | if (fcopy_transaction.state != HVUTIL_USERSPACE_REQ) |
309 | return -EINVAL; | |
310 | ||
01325476 S |
311 | /* |
312 | * Complete the transaction by forwarding the result | |
313 | * to the host. But first, cancel the timeout. | |
314 | */ | |
4c93cccc VK |
315 | if (cancel_delayed_work_sync(&fcopy_timeout_work)) { |
316 | fcopy_transaction.state = HVUTIL_USERSPACE_RECV; | |
c7e490fc | 317 | fcopy_respond_to_host(*val); |
3cace4a6 OH |
318 | hv_poll_channel(fcopy_transaction.recv_channel, |
319 | fcopy_poll_wrapper); | |
242f3122 | 320 | } |
01325476 | 321 | |
01325476 S |
322 | return 0; |
323 | } | |
324 | ||
c7e490fc | 325 | static void fcopy_on_reset(void) |
01325476 S |
326 | { |
327 | /* | |
328 | * The daemon has exited; reset the state. | |
329 | */ | |
4c93cccc | 330 | fcopy_transaction.state = HVUTIL_DEVICE_INIT; |
d9b16529 | 331 | |
c7e490fc | 332 | if (cancel_delayed_work_sync(&fcopy_timeout_work)) |
d9b16529 | 333 | fcopy_respond_to_host(HV_E_FAIL); |
20951c75 | 334 | complete(&release_event); |
01325476 S |
335 | } |
336 | ||
337 | int hv_fcopy_init(struct hv_util_service *srv) | |
338 | { | |
339 | recv_buffer = srv->recv_buffer; | |
b9830d12 | 340 | fcopy_transaction.recv_channel = srv->channel; |
01325476 | 341 | |
20951c75 | 342 | init_completion(&release_event); |
01325476 S |
343 | /* |
344 | * When this driver loads, the user level daemon that | |
345 | * processes the host requests may not yet be running. | |
346 | * Defer processing channel callbacks until the daemon | |
347 | * has registered. | |
348 | */ | |
4c93cccc | 349 | fcopy_transaction.state = HVUTIL_DEVICE_INIT; |
01325476 | 350 | |
c7e490fc VK |
351 | hvt = hvutil_transport_init(fcopy_devname, 0, 0, |
352 | fcopy_on_msg, fcopy_on_reset); | |
353 | if (!hvt) | |
354 | return -EFAULT; | |
355 | ||
356 | return 0; | |
01325476 S |
357 | } |
358 | ||
359 | void hv_fcopy_deinit(void) | |
360 | { | |
4c93cccc | 361 | fcopy_transaction.state = HVUTIL_DEVICE_DYING; |
1d072339 | 362 | cancel_delayed_work_sync(&fcopy_timeout_work); |
c7e490fc | 363 | hvutil_transport_destroy(hvt); |
20951c75 | 364 | wait_for_completion(&release_event); |
01325476 | 365 | } |