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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * An implementation of file copy service.
4 *
5 * Copyright (C) 2014, Microsoft, Inc.
6 *
7 * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/nls.h>
13#include <linux/workqueue.h>
14#include <linux/hyperv.h>
15#include <linux/sched.h>
16#include <asm/hyperv-tlfs.h>
17
18#include "hyperv_vmbus.h"
19#include "hv_utils_transport.h"
20
21#define WIN8_SRV_MAJOR 1
22#define WIN8_SRV_MINOR 1
23#define WIN8_SRV_VERSION (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR)
24
25#define FCOPY_VER_COUNT 1
26static const int fcopy_versions[] = {
27 WIN8_SRV_VERSION
28};
29
30#define FW_VER_COUNT 1
31static const int fw_versions[] = {
32 UTIL_FW_VERSION
33};
34
35/*
36 * Global state maintained for transaction that is being processed.
37 * For a class of integration services, including the "file copy service",
38 * the specified protocol is a "request/response" protocol which means that
39 * there can only be single outstanding transaction from the host at any
40 * given point in time. We use this to simplify memory management in this
41 * driver - we cache and process only one message at a time.
42 *
43 * While the request/response protocol is guaranteed by the host, we further
44 * ensure this by serializing packet processing in this driver - we do not
45 * read additional packets from the VMBUs until the current packet is fully
46 * handled.
47 */
48
49static struct {
50 int state; /* hvutil_device_state */
51 int recv_len; /* number of bytes received. */
52 struct hv_fcopy_hdr *fcopy_msg; /* current message */
53 struct vmbus_channel *recv_channel; /* chn we got the request */
54 u64 recv_req_id; /* request ID. */
55} fcopy_transaction;
56
57static void fcopy_respond_to_host(int error);
58static void fcopy_send_data(struct work_struct *dummy);
59static void fcopy_timeout_func(struct work_struct *dummy);
60static DECLARE_DELAYED_WORK(fcopy_timeout_work, fcopy_timeout_func);
61static DECLARE_WORK(fcopy_send_work, fcopy_send_data);
62static const char fcopy_devname[] = "vmbus/hv_fcopy";
63static u8 *recv_buffer;
64static struct hvutil_transport *hvt;
65/*
66 * This state maintains the version number registered by the daemon.
67 */
68static int dm_reg_value;
69
70static void fcopy_poll_wrapper(void *channel)
71{
72 /* Transaction is finished, reset the state here to avoid races. */
73 fcopy_transaction.state = HVUTIL_READY;
74 tasklet_schedule(&((struct vmbus_channel *)channel)->callback_event);
75}
76
77static void fcopy_timeout_func(struct work_struct *dummy)
78{
79 /*
80 * If the timer fires, the user-mode component has not responded;
81 * process the pending transaction.
82 */
83 fcopy_respond_to_host(HV_E_FAIL);
84 hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper);
85}
86
87static void fcopy_register_done(void)
88{
89 pr_debug("FCP: userspace daemon registered\n");
90 hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper);
91}
92
93static int fcopy_handle_handshake(u32 version)
94{
95 u32 our_ver = FCOPY_CURRENT_VERSION;
96
97 switch (version) {
98 case FCOPY_VERSION_0:
99 /* Daemon doesn't expect us to reply */
100 dm_reg_value = version;
101 break;
102 case FCOPY_VERSION_1:
103 /* Daemon expects us to reply with our own version */
104 if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver),
105 fcopy_register_done))
106 return -EFAULT;
107 dm_reg_value = version;
108 break;
109 default:
110 /*
111 * For now we will fail the registration.
112 * If and when we have multiple versions to
113 * deal with, we will be backward compatible.
114 * We will add this code when needed.
115 */
116 return -EINVAL;
117 }
118 pr_debug("FCP: userspace daemon ver. %d connected\n", version);
119 return 0;
120}
121
122static void fcopy_send_data(struct work_struct *dummy)
123{
124 struct hv_start_fcopy *smsg_out = NULL;
125 int operation = fcopy_transaction.fcopy_msg->operation;
126 struct hv_start_fcopy *smsg_in;
127 void *out_src;
128 int rc, out_len;
129
130 /*
131 * The strings sent from the host are encoded in
132 * utf16; convert it to utf8 strings.
133 * The host assures us that the utf16 strings will not exceed
134 * the max lengths specified. We will however, reserve room
135 * for the string terminating character - in the utf16s_utf8s()
136 * function we limit the size of the buffer where the converted
137 * string is placed to W_MAX_PATH -1 to guarantee
138 * that the strings can be properly terminated!
139 */
140
141 switch (operation) {
142 case START_FILE_COPY:
143 out_len = sizeof(struct hv_start_fcopy);
144 smsg_out = kzalloc(sizeof(*smsg_out), GFP_KERNEL);
145 if (!smsg_out)
146 return;
147
148 smsg_out->hdr.operation = operation;
149 smsg_in = (struct hv_start_fcopy *)fcopy_transaction.fcopy_msg;
150
151 utf16s_to_utf8s((wchar_t *)smsg_in->file_name, W_MAX_PATH,
152 UTF16_LITTLE_ENDIAN,
153 (__u8 *)&smsg_out->file_name, W_MAX_PATH - 1);
154
155 utf16s_to_utf8s((wchar_t *)smsg_in->path_name, W_MAX_PATH,
156 UTF16_LITTLE_ENDIAN,
157 (__u8 *)&smsg_out->path_name, W_MAX_PATH - 1);
158
159 smsg_out->copy_flags = smsg_in->copy_flags;
160 smsg_out->file_size = smsg_in->file_size;
161 out_src = smsg_out;
162 break;
163
164 case WRITE_TO_FILE:
165 out_src = fcopy_transaction.fcopy_msg;
166 out_len = sizeof(struct hv_do_fcopy);
167 break;
168 default:
169 out_src = fcopy_transaction.fcopy_msg;
170 out_len = fcopy_transaction.recv_len;
171 break;
172 }
173
174 fcopy_transaction.state = HVUTIL_USERSPACE_REQ;
175 rc = hvutil_transport_send(hvt, out_src, out_len, NULL);
176 if (rc) {
177 pr_debug("FCP: failed to communicate to the daemon: %d\n", rc);
178 if (cancel_delayed_work_sync(&fcopy_timeout_work)) {
179 fcopy_respond_to_host(HV_E_FAIL);
180 fcopy_transaction.state = HVUTIL_READY;
181 }
182 }
183 kfree(smsg_out);
184}
185
186/*
187 * Send a response back to the host.
188 */
189
190static void
191fcopy_respond_to_host(int error)
192{
193 struct icmsg_hdr *icmsghdr;
194 u32 buf_len;
195 struct vmbus_channel *channel;
196 u64 req_id;
197
198 /*
199 * Copy the global state for completing the transaction. Note that
200 * only one transaction can be active at a time. This is guaranteed
201 * by the file copy protocol implemented by the host. Furthermore,
202 * the "transaction active" state we maintain ensures that there can
203 * only be one active transaction at a time.
204 */
205
206 buf_len = fcopy_transaction.recv_len;
207 channel = fcopy_transaction.recv_channel;
208 req_id = fcopy_transaction.recv_req_id;
209
210 icmsghdr = (struct icmsg_hdr *)
211 &recv_buffer[sizeof(struct vmbuspipe_hdr)];
212
213 if (channel->onchannel_callback == NULL)
214 /*
215 * We have raced with util driver being unloaded;
216 * silently return.
217 */
218 return;
219
220 icmsghdr->status = error;
221 icmsghdr->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
222 vmbus_sendpacket(channel, recv_buffer, buf_len, req_id,
223 VM_PKT_DATA_INBAND, 0);
224}
225
226void hv_fcopy_onchannelcallback(void *context)
227{
228 struct vmbus_channel *channel = context;
229 u32 recvlen;
230 u64 requestid;
231 struct hv_fcopy_hdr *fcopy_msg;
232 struct icmsg_hdr *icmsghdr;
233 int fcopy_srv_version;
234
235 if (fcopy_transaction.state > HVUTIL_READY)
236 return;
237
238 if (vmbus_recvpacket(channel, recv_buffer, HV_HYP_PAGE_SIZE * 2, &recvlen, &requestid)) {
239 pr_err_ratelimited("Fcopy request received. Could not read into recv buf\n");
240 return;
241 }
242
243 if (!recvlen)
244 return;
245
246 /* Ensure recvlen is big enough to read header data */
247 if (recvlen < ICMSG_HDR) {
248 pr_err_ratelimited("Fcopy request received. Packet length too small: %d\n",
249 recvlen);
250 return;
251 }
252
253 icmsghdr = (struct icmsg_hdr *)&recv_buffer[
254 sizeof(struct vmbuspipe_hdr)];
255
256 if (icmsghdr->icmsgtype == ICMSGTYPE_NEGOTIATE) {
257 if (vmbus_prep_negotiate_resp(icmsghdr,
258 recv_buffer, recvlen,
259 fw_versions, FW_VER_COUNT,
260 fcopy_versions, FCOPY_VER_COUNT,
261 NULL, &fcopy_srv_version)) {
262
263 pr_info("FCopy IC version %d.%d\n",
264 fcopy_srv_version >> 16,
265 fcopy_srv_version & 0xFFFF);
266 }
267 } else if (icmsghdr->icmsgtype == ICMSGTYPE_FCOPY) {
268 /* Ensure recvlen is big enough to contain hv_fcopy_hdr */
269 if (recvlen < ICMSG_HDR + sizeof(struct hv_fcopy_hdr)) {
270 pr_err_ratelimited("Invalid Fcopy hdr. Packet length too small: %u\n",
271 recvlen);
272 return;
273 }
274 fcopy_msg = (struct hv_fcopy_hdr *)&recv_buffer[ICMSG_HDR];
275
276 /*
277 * Stash away this global state for completing the
278 * transaction; note transactions are serialized.
279 */
280
281 fcopy_transaction.recv_len = recvlen;
282 fcopy_transaction.recv_req_id = requestid;
283 fcopy_transaction.fcopy_msg = fcopy_msg;
284
285 if (fcopy_transaction.state < HVUTIL_READY) {
286 /* Userspace is not registered yet */
287 fcopy_respond_to_host(HV_E_FAIL);
288 return;
289 }
290 fcopy_transaction.state = HVUTIL_HOSTMSG_RECEIVED;
291
292 /*
293 * Send the information to the user-level daemon.
294 */
295 schedule_work(&fcopy_send_work);
296 schedule_delayed_work(&fcopy_timeout_work,
297 HV_UTIL_TIMEOUT * HZ);
298 return;
299 } else {
300 pr_err_ratelimited("Fcopy request received. Invalid msg type: %d\n",
301 icmsghdr->icmsgtype);
302 return;
303 }
304 icmsghdr->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
305 vmbus_sendpacket(channel, recv_buffer, recvlen, requestid,
306 VM_PKT_DATA_INBAND, 0);
307}
308
309/* Callback when data is received from userspace */
310static int fcopy_on_msg(void *msg, int len)
311{
312 int *val = (int *)msg;
313
314 if (len != sizeof(int))
315 return -EINVAL;
316
317 if (fcopy_transaction.state == HVUTIL_DEVICE_INIT)
318 return fcopy_handle_handshake(*val);
319
320 if (fcopy_transaction.state != HVUTIL_USERSPACE_REQ)
321 return -EINVAL;
322
323 /*
324 * Complete the transaction by forwarding the result
325 * to the host. But first, cancel the timeout.
326 */
327 if (cancel_delayed_work_sync(&fcopy_timeout_work)) {
328 fcopy_transaction.state = HVUTIL_USERSPACE_RECV;
329 fcopy_respond_to_host(*val);
330 hv_poll_channel(fcopy_transaction.recv_channel,
331 fcopy_poll_wrapper);
332 }
333
334 return 0;
335}
336
337static void fcopy_on_reset(void)
338{
339 /*
340 * The daemon has exited; reset the state.
341 */
342 fcopy_transaction.state = HVUTIL_DEVICE_INIT;
343
344 if (cancel_delayed_work_sync(&fcopy_timeout_work))
345 fcopy_respond_to_host(HV_E_FAIL);
346}
347
348int hv_fcopy_init(struct hv_util_service *srv)
349{
350 recv_buffer = srv->recv_buffer;
351 fcopy_transaction.recv_channel = srv->channel;
352 fcopy_transaction.recv_channel->max_pkt_size = HV_HYP_PAGE_SIZE * 2;
353
354 /*
355 * When this driver loads, the user level daemon that
356 * processes the host requests may not yet be running.
357 * Defer processing channel callbacks until the daemon
358 * has registered.
359 */
360 fcopy_transaction.state = HVUTIL_DEVICE_INIT;
361
362 hvt = hvutil_transport_init(fcopy_devname, 0, 0,
363 fcopy_on_msg, fcopy_on_reset);
364 if (!hvt)
365 return -EFAULT;
366
367 return 0;
368}
369
370static void hv_fcopy_cancel_work(void)
371{
372 cancel_delayed_work_sync(&fcopy_timeout_work);
373 cancel_work_sync(&fcopy_send_work);
374}
375
376int hv_fcopy_pre_suspend(void)
377{
378 struct vmbus_channel *channel = fcopy_transaction.recv_channel;
379 struct hv_fcopy_hdr *fcopy_msg;
380
381 /*
382 * Fake a CANCEL_FCOPY message for the user space daemon in case the
383 * daemon is in the middle of copying some file. It doesn't matter if
384 * there is already a message pending to be delivered to the user
385 * space since we force fcopy_transaction.state to be HVUTIL_READY, so
386 * the user space daemon's write() will fail with EINVAL (see
387 * fcopy_on_msg()), and the daemon will reset the device by closing
388 * and re-opening it.
389 */
390 fcopy_msg = kzalloc(sizeof(*fcopy_msg), GFP_KERNEL);
391 if (!fcopy_msg)
392 return -ENOMEM;
393
394 tasklet_disable(&channel->callback_event);
395
396 fcopy_msg->operation = CANCEL_FCOPY;
397
398 hv_fcopy_cancel_work();
399
400 /* We don't care about the return value. */
401 hvutil_transport_send(hvt, fcopy_msg, sizeof(*fcopy_msg), NULL);
402
403 kfree(fcopy_msg);
404
405 fcopy_transaction.state = HVUTIL_READY;
406
407 /* tasklet_enable() will be called in hv_fcopy_pre_resume(). */
408 return 0;
409}
410
411int hv_fcopy_pre_resume(void)
412{
413 struct vmbus_channel *channel = fcopy_transaction.recv_channel;
414
415 tasklet_enable(&channel->callback_event);
416
417 return 0;
418}
419
420void hv_fcopy_deinit(void)
421{
422 fcopy_transaction.state = HVUTIL_DEVICE_DYING;
423
424 hv_fcopy_cancel_work();
425
426 hvutil_transport_destroy(hvt);
427}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * An implementation of file copy service.
4 *
5 * Copyright (C) 2014, Microsoft, Inc.
6 *
7 * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/nls.h>
13#include <linux/workqueue.h>
14#include <linux/hyperv.h>
15#include <linux/sched.h>
16
17#include "hyperv_vmbus.h"
18#include "hv_utils_transport.h"
19
20#define WIN8_SRV_MAJOR 1
21#define WIN8_SRV_MINOR 1
22#define WIN8_SRV_VERSION (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR)
23
24#define FCOPY_VER_COUNT 1
25static const int fcopy_versions[] = {
26 WIN8_SRV_VERSION
27};
28
29#define FW_VER_COUNT 1
30static const int fw_versions[] = {
31 UTIL_FW_VERSION
32};
33
34/*
35 * Global state maintained for transaction that is being processed.
36 * For a class of integration services, including the "file copy service",
37 * the specified protocol is a "request/response" protocol which means that
38 * there can only be single outstanding transaction from the host at any
39 * given point in time. We use this to simplify memory management in this
40 * driver - we cache and process only one message at a time.
41 *
42 * While the request/response protocol is guaranteed by the host, we further
43 * ensure this by serializing packet processing in this driver - we do not
44 * read additional packets from the VMBUs until the current packet is fully
45 * handled.
46 */
47
48static struct {
49 int state; /* hvutil_device_state */
50 int recv_len; /* number of bytes received. */
51 struct hv_fcopy_hdr *fcopy_msg; /* current message */
52 struct vmbus_channel *recv_channel; /* chn we got the request */
53 u64 recv_req_id; /* request ID. */
54} fcopy_transaction;
55
56static void fcopy_respond_to_host(int error);
57static void fcopy_send_data(struct work_struct *dummy);
58static void fcopy_timeout_func(struct work_struct *dummy);
59static DECLARE_DELAYED_WORK(fcopy_timeout_work, fcopy_timeout_func);
60static DECLARE_WORK(fcopy_send_work, fcopy_send_data);
61static const char fcopy_devname[] = "vmbus/hv_fcopy";
62static u8 *recv_buffer;
63static struct hvutil_transport *hvt;
64/*
65 * This state maintains the version number registered by the daemon.
66 */
67static int dm_reg_value;
68
69static void fcopy_poll_wrapper(void *channel)
70{
71 /* Transaction is finished, reset the state here to avoid races. */
72 fcopy_transaction.state = HVUTIL_READY;
73 hv_fcopy_onchannelcallback(channel);
74}
75
76static void fcopy_timeout_func(struct work_struct *dummy)
77{
78 /*
79 * If the timer fires, the user-mode component has not responded;
80 * process the pending transaction.
81 */
82 fcopy_respond_to_host(HV_E_FAIL);
83 hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper);
84}
85
86static void fcopy_register_done(void)
87{
88 pr_debug("FCP: userspace daemon registered\n");
89 hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper);
90}
91
92static int fcopy_handle_handshake(u32 version)
93{
94 u32 our_ver = FCOPY_CURRENT_VERSION;
95
96 switch (version) {
97 case FCOPY_VERSION_0:
98 /* Daemon doesn't expect us to reply */
99 dm_reg_value = version;
100 break;
101 case FCOPY_VERSION_1:
102 /* Daemon expects us to reply with our own version */
103 if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver),
104 fcopy_register_done))
105 return -EFAULT;
106 dm_reg_value = version;
107 break;
108 default:
109 /*
110 * For now we will fail the registration.
111 * If and when we have multiple versions to
112 * deal with, we will be backward compatible.
113 * We will add this code when needed.
114 */
115 return -EINVAL;
116 }
117 pr_debug("FCP: userspace daemon ver. %d connected\n", version);
118 return 0;
119}
120
121static void fcopy_send_data(struct work_struct *dummy)
122{
123 struct hv_start_fcopy *smsg_out = NULL;
124 int operation = fcopy_transaction.fcopy_msg->operation;
125 struct hv_start_fcopy *smsg_in;
126 void *out_src;
127 int rc, out_len;
128
129 /*
130 * The strings sent from the host are encoded in
131 * in utf16; convert it to utf8 strings.
132 * The host assures us that the utf16 strings will not exceed
133 * the max lengths specified. We will however, reserve room
134 * for the string terminating character - in the utf16s_utf8s()
135 * function we limit the size of the buffer where the converted
136 * string is placed to W_MAX_PATH -1 to guarantee
137 * that the strings can be properly terminated!
138 */
139
140 switch (operation) {
141 case START_FILE_COPY:
142 out_len = sizeof(struct hv_start_fcopy);
143 smsg_out = kzalloc(sizeof(*smsg_out), GFP_KERNEL);
144 if (!smsg_out)
145 return;
146
147 smsg_out->hdr.operation = operation;
148 smsg_in = (struct hv_start_fcopy *)fcopy_transaction.fcopy_msg;
149
150 utf16s_to_utf8s((wchar_t *)smsg_in->file_name, W_MAX_PATH,
151 UTF16_LITTLE_ENDIAN,
152 (__u8 *)&smsg_out->file_name, W_MAX_PATH - 1);
153
154 utf16s_to_utf8s((wchar_t *)smsg_in->path_name, W_MAX_PATH,
155 UTF16_LITTLE_ENDIAN,
156 (__u8 *)&smsg_out->path_name, W_MAX_PATH - 1);
157
158 smsg_out->copy_flags = smsg_in->copy_flags;
159 smsg_out->file_size = smsg_in->file_size;
160 out_src = smsg_out;
161 break;
162
163 case WRITE_TO_FILE:
164 out_src = fcopy_transaction.fcopy_msg;
165 out_len = sizeof(struct hv_do_fcopy);
166 break;
167 default:
168 out_src = fcopy_transaction.fcopy_msg;
169 out_len = fcopy_transaction.recv_len;
170 break;
171 }
172
173 fcopy_transaction.state = HVUTIL_USERSPACE_REQ;
174 rc = hvutil_transport_send(hvt, out_src, out_len, NULL);
175 if (rc) {
176 pr_debug("FCP: failed to communicate to the daemon: %d\n", rc);
177 if (cancel_delayed_work_sync(&fcopy_timeout_work)) {
178 fcopy_respond_to_host(HV_E_FAIL);
179 fcopy_transaction.state = HVUTIL_READY;
180 }
181 }
182 kfree(smsg_out);
183}
184
185/*
186 * Send a response back to the host.
187 */
188
189static void
190fcopy_respond_to_host(int error)
191{
192 struct icmsg_hdr *icmsghdr;
193 u32 buf_len;
194 struct vmbus_channel *channel;
195 u64 req_id;
196
197 /*
198 * Copy the global state for completing the transaction. Note that
199 * only one transaction can be active at a time. This is guaranteed
200 * by the file copy protocol implemented by the host. Furthermore,
201 * the "transaction active" state we maintain ensures that there can
202 * only be one active transaction at a time.
203 */
204
205 buf_len = fcopy_transaction.recv_len;
206 channel = fcopy_transaction.recv_channel;
207 req_id = fcopy_transaction.recv_req_id;
208
209 icmsghdr = (struct icmsg_hdr *)
210 &recv_buffer[sizeof(struct vmbuspipe_hdr)];
211
212 if (channel->onchannel_callback == NULL)
213 /*
214 * We have raced with util driver being unloaded;
215 * silently return.
216 */
217 return;
218
219 icmsghdr->status = error;
220 icmsghdr->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
221 vmbus_sendpacket(channel, recv_buffer, buf_len, req_id,
222 VM_PKT_DATA_INBAND, 0);
223}
224
225void hv_fcopy_onchannelcallback(void *context)
226{
227 struct vmbus_channel *channel = context;
228 u32 recvlen;
229 u64 requestid;
230 struct hv_fcopy_hdr *fcopy_msg;
231 struct icmsg_hdr *icmsghdr;
232 int fcopy_srv_version;
233
234 if (fcopy_transaction.state > HVUTIL_READY)
235 return;
236
237 vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 2, &recvlen,
238 &requestid);
239 if (recvlen <= 0)
240 return;
241
242 icmsghdr = (struct icmsg_hdr *)&recv_buffer[
243 sizeof(struct vmbuspipe_hdr)];
244 if (icmsghdr->icmsgtype == ICMSGTYPE_NEGOTIATE) {
245 if (vmbus_prep_negotiate_resp(icmsghdr, recv_buffer,
246 fw_versions, FW_VER_COUNT,
247 fcopy_versions, FCOPY_VER_COUNT,
248 NULL, &fcopy_srv_version)) {
249
250 pr_info("FCopy IC version %d.%d\n",
251 fcopy_srv_version >> 16,
252 fcopy_srv_version & 0xFFFF);
253 }
254 } else {
255 fcopy_msg = (struct hv_fcopy_hdr *)&recv_buffer[
256 sizeof(struct vmbuspipe_hdr) +
257 sizeof(struct icmsg_hdr)];
258
259 /*
260 * Stash away this global state for completing the
261 * transaction; note transactions are serialized.
262 */
263
264 fcopy_transaction.recv_len = recvlen;
265 fcopy_transaction.recv_req_id = requestid;
266 fcopy_transaction.fcopy_msg = fcopy_msg;
267
268 if (fcopy_transaction.state < HVUTIL_READY) {
269 /* Userspace is not registered yet */
270 fcopy_respond_to_host(HV_E_FAIL);
271 return;
272 }
273 fcopy_transaction.state = HVUTIL_HOSTMSG_RECEIVED;
274
275 /*
276 * Send the information to the user-level daemon.
277 */
278 schedule_work(&fcopy_send_work);
279 schedule_delayed_work(&fcopy_timeout_work,
280 HV_UTIL_TIMEOUT * HZ);
281 return;
282 }
283 icmsghdr->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
284 vmbus_sendpacket(channel, recv_buffer, recvlen, requestid,
285 VM_PKT_DATA_INBAND, 0);
286}
287
288/* Callback when data is received from userspace */
289static int fcopy_on_msg(void *msg, int len)
290{
291 int *val = (int *)msg;
292
293 if (len != sizeof(int))
294 return -EINVAL;
295
296 if (fcopy_transaction.state == HVUTIL_DEVICE_INIT)
297 return fcopy_handle_handshake(*val);
298
299 if (fcopy_transaction.state != HVUTIL_USERSPACE_REQ)
300 return -EINVAL;
301
302 /*
303 * Complete the transaction by forwarding the result
304 * to the host. But first, cancel the timeout.
305 */
306 if (cancel_delayed_work_sync(&fcopy_timeout_work)) {
307 fcopy_transaction.state = HVUTIL_USERSPACE_RECV;
308 fcopy_respond_to_host(*val);
309 hv_poll_channel(fcopy_transaction.recv_channel,
310 fcopy_poll_wrapper);
311 }
312
313 return 0;
314}
315
316static void fcopy_on_reset(void)
317{
318 /*
319 * The daemon has exited; reset the state.
320 */
321 fcopy_transaction.state = HVUTIL_DEVICE_INIT;
322
323 if (cancel_delayed_work_sync(&fcopy_timeout_work))
324 fcopy_respond_to_host(HV_E_FAIL);
325}
326
327int hv_fcopy_init(struct hv_util_service *srv)
328{
329 recv_buffer = srv->recv_buffer;
330 fcopy_transaction.recv_channel = srv->channel;
331
332 /*
333 * When this driver loads, the user level daemon that
334 * processes the host requests may not yet be running.
335 * Defer processing channel callbacks until the daemon
336 * has registered.
337 */
338 fcopy_transaction.state = HVUTIL_DEVICE_INIT;
339
340 hvt = hvutil_transport_init(fcopy_devname, 0, 0,
341 fcopy_on_msg, fcopy_on_reset);
342 if (!hvt)
343 return -EFAULT;
344
345 return 0;
346}
347
348void hv_fcopy_deinit(void)
349{
350 fcopy_transaction.state = HVUTIL_DEVICE_DYING;
351 cancel_delayed_work_sync(&fcopy_timeout_work);
352 hvutil_transport_destroy(hvt);
353}