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ab841160 OW |
1 | /* |
2 | * | |
3 | * Intel Management Engine Interface (Intel MEI) Linux driver | |
733ba91c | 4 | * Copyright (c) 2003-2012, Intel Corporation. |
ab841160 OW |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | */ | |
16 | ||
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/fs.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/fcntl.h> | |
23 | #include <linux/aio.h> | |
24 | #include <linux/pci.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/ioctl.h> | |
27 | #include <linux/cdev.h> | |
28 | #include <linux/list.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/sched.h> | |
31 | #include <linux/uuid.h> | |
32 | #include <linux/jiffies.h> | |
33 | #include <linux/uaccess.h> | |
34 | ||
35 | ||
4f3afe1d | 36 | #include <linux/mei.h> |
47a73801 TW |
37 | |
38 | #include "mei_dev.h" | |
ab841160 | 39 | #include "interface.h" |
ab841160 | 40 | |
601a1efa TW |
41 | /** |
42 | * mei_io_cb_free - free mei_cb_private related memory | |
43 | * | |
44 | * @cb: mei callback struct | |
45 | */ | |
46 | void mei_io_cb_free(struct mei_cl_cb *cb) | |
47 | { | |
48 | if (cb == NULL) | |
49 | return; | |
50 | ||
51 | kfree(cb->request_buffer.data); | |
52 | kfree(cb->response_buffer.data); | |
53 | kfree(cb); | |
54 | } | |
664df38b TW |
55 | /** |
56 | * mei_io_cb_init - allocate and initialize io callback | |
57 | * | |
58 | * @cl - mei client | |
59 | * @file: pointer to file structure | |
60 | * | |
61 | * returns mei_cl_cb pointer or NULL; | |
62 | */ | |
63 | struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp) | |
64 | { | |
65 | struct mei_cl_cb *cb; | |
66 | ||
67 | cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL); | |
68 | if (!cb) | |
69 | return NULL; | |
70 | ||
71 | mei_io_list_init(cb); | |
72 | ||
73 | cb->file_object = fp; | |
db3ed431 | 74 | cb->cl = cl; |
664df38b TW |
75 | cb->buf_idx = 0; |
76 | return cb; | |
77 | } | |
78 | ||
79 | ||
80 | /** | |
81 | * mei_io_cb_alloc_req_buf - allocate request buffer | |
82 | * | |
83 | * @cb - io callback structure | |
84 | * @size: size of the buffer | |
85 | * | |
86 | * returns 0 on success | |
87 | * -EINVAL if cb is NULL | |
88 | * -ENOMEM if allocation failed | |
89 | */ | |
90 | int mei_io_cb_alloc_req_buf(struct mei_cl_cb *cb, size_t length) | |
91 | { | |
92 | if (!cb) | |
93 | return -EINVAL; | |
94 | ||
95 | if (length == 0) | |
96 | return 0; | |
97 | ||
98 | cb->request_buffer.data = kmalloc(length, GFP_KERNEL); | |
99 | if (!cb->request_buffer.data) | |
100 | return -ENOMEM; | |
101 | cb->request_buffer.size = length; | |
102 | return 0; | |
103 | } | |
104 | /** | |
105 | * mei_io_cb_alloc_req_buf - allocate respose buffer | |
106 | * | |
107 | * @cb - io callback structure | |
108 | * @size: size of the buffer | |
109 | * | |
110 | * returns 0 on success | |
111 | * -EINVAL if cb is NULL | |
112 | * -ENOMEM if allocation failed | |
113 | */ | |
114 | int mei_io_cb_alloc_resp_buf(struct mei_cl_cb *cb, size_t length) | |
115 | { | |
116 | if (!cb) | |
117 | return -EINVAL; | |
118 | ||
119 | if (length == 0) | |
120 | return 0; | |
121 | ||
122 | cb->response_buffer.data = kmalloc(length, GFP_KERNEL); | |
123 | if (!cb->response_buffer.data) | |
124 | return -ENOMEM; | |
125 | cb->response_buffer.size = length; | |
126 | return 0; | |
127 | } | |
128 | ||
601a1efa | 129 | |
07b509b7 TW |
130 | /** |
131 | * mei_me_cl_by_id return index to me_clients for client_id | |
132 | * | |
133 | * @dev: the device structure | |
134 | * @client_id: me client id | |
135 | * | |
136 | * Locking: called under "dev->device_lock" lock | |
137 | * | |
138 | * returns index on success, -ENOENT on failure. | |
139 | */ | |
ab841160 | 140 | |
07b509b7 TW |
141 | int mei_me_cl_by_id(struct mei_device *dev, u8 client_id) |
142 | { | |
143 | int i; | |
144 | for (i = 0; i < dev->me_clients_num; i++) | |
145 | if (dev->me_clients[i].client_id == client_id) | |
146 | break; | |
147 | if (WARN_ON(dev->me_clients[i].client_id != client_id)) | |
148 | return -ENOENT; | |
149 | ||
150 | if (i == dev->me_clients_num) | |
151 | return -ENOENT; | |
152 | ||
153 | return i; | |
154 | } | |
ab841160 OW |
155 | |
156 | /** | |
157 | * mei_ioctl_connect_client - the connect to fw client IOCTL function | |
158 | * | |
159 | * @dev: the device structure | |
160 | * @data: IOCTL connect data, input and output parameters | |
161 | * @file: private data of the file object | |
162 | * | |
163 | * Locking: called under "dev->device_lock" lock | |
164 | * | |
165 | * returns 0 on success, <0 on failure. | |
166 | */ | |
167 | int mei_ioctl_connect_client(struct file *file, | |
168 | struct mei_connect_client_data *data) | |
169 | { | |
170 | struct mei_device *dev; | |
171 | struct mei_cl_cb *cb; | |
172 | struct mei_client *client; | |
173 | struct mei_cl *cl; | |
3870c320 | 174 | long timeout = mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT); |
ab841160 OW |
175 | int i; |
176 | int err; | |
177 | int rets; | |
178 | ||
179 | cl = file->private_data; | |
180 | if (WARN_ON(!cl || !cl->dev)) | |
181 | return -ENODEV; | |
182 | ||
183 | dev = cl->dev; | |
184 | ||
185 | dev_dbg(&dev->pdev->dev, "mei_ioctl_connect_client() Entry\n"); | |
186 | ||
ab841160 | 187 | /* buffered ioctl cb */ |
664df38b | 188 | cb = mei_io_cb_init(cl, file); |
ab841160 OW |
189 | if (!cb) { |
190 | rets = -ENOMEM; | |
191 | goto end; | |
192 | } | |
ab841160 | 193 | |
4b8960b4 | 194 | cb->fop_type = MEI_FOP_IOCTL; |
ab841160 | 195 | |
b210d750 | 196 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
197 | rets = -ENODEV; |
198 | goto end; | |
199 | } | |
200 | if (cl->state != MEI_FILE_INITIALIZING && | |
201 | cl->state != MEI_FILE_DISCONNECTED) { | |
202 | rets = -EBUSY; | |
203 | goto end; | |
204 | } | |
205 | ||
206 | /* find ME client we're trying to connect to */ | |
07b509b7 | 207 | i = mei_me_cl_by_uuid(dev, &data->in_client_uuid); |
ab841160 OW |
208 | if (i >= 0 && !dev->me_clients[i].props.fixed_address) { |
209 | cl->me_client_id = dev->me_clients[i].client_id; | |
210 | cl->state = MEI_FILE_CONNECTING; | |
211 | } | |
212 | ||
213 | dev_dbg(&dev->pdev->dev, "Connect to FW Client ID = %d\n", | |
214 | cl->me_client_id); | |
215 | dev_dbg(&dev->pdev->dev, "FW Client - Protocol Version = %d\n", | |
216 | dev->me_clients[i].props.protocol_version); | |
217 | dev_dbg(&dev->pdev->dev, "FW Client - Max Msg Len = %d\n", | |
218 | dev->me_clients[i].props.max_msg_length); | |
219 | ||
5f9092f3 JM |
220 | /* if we're connecting to amthi client then we will use the |
221 | * existing connection | |
ab841160 OW |
222 | */ |
223 | if (uuid_le_cmp(data->in_client_uuid, mei_amthi_guid) == 0) { | |
224 | dev_dbg(&dev->pdev->dev, "FW Client is amthi\n"); | |
225 | if (dev->iamthif_cl.state != MEI_FILE_CONNECTED) { | |
226 | rets = -ENODEV; | |
227 | goto end; | |
228 | } | |
229 | clear_bit(cl->host_client_id, dev->host_clients_map); | |
ff8b2f4e | 230 | mei_me_cl_unlink(dev, cl); |
ab841160 | 231 | |
ab841160 | 232 | kfree(cl); |
ab841160 OW |
233 | cl = NULL; |
234 | file->private_data = &dev->iamthif_cl; | |
235 | ||
236 | client = &data->out_client_properties; | |
237 | client->max_msg_length = | |
238 | dev->me_clients[i].props.max_msg_length; | |
239 | client->protocol_version = | |
240 | dev->me_clients[i].props.protocol_version; | |
241 | rets = dev->iamthif_cl.status; | |
242 | ||
243 | goto end; | |
244 | } | |
245 | ||
246 | if (cl->state != MEI_FILE_CONNECTING) { | |
247 | rets = -ENODEV; | |
248 | goto end; | |
249 | } | |
250 | ||
251 | ||
252 | /* prepare the output buffer */ | |
253 | client = &data->out_client_properties; | |
254 | client->max_msg_length = dev->me_clients[i].props.max_msg_length; | |
255 | client->protocol_version = dev->me_clients[i].props.protocol_version; | |
256 | dev_dbg(&dev->pdev->dev, "Can connect?\n"); | |
257 | if (dev->mei_host_buffer_is_empty | |
258 | && !mei_other_client_is_connecting(dev, cl)) { | |
259 | dev_dbg(&dev->pdev->dev, "Sending Connect Message\n"); | |
eb9af0ac | 260 | dev->mei_host_buffer_is_empty = false; |
8120e720 | 261 | if (mei_hbm_cl_connect_req(dev, cl)) { |
ab841160 OW |
262 | dev_dbg(&dev->pdev->dev, "Sending connect message - failed\n"); |
263 | rets = -ENODEV; | |
264 | goto end; | |
265 | } else { | |
266 | dev_dbg(&dev->pdev->dev, "Sending connect message - succeeded\n"); | |
267 | cl->timer_count = MEI_CONNECT_TIMEOUT; | |
fb601adb | 268 | list_add_tail(&cb->list, &dev->ctrl_rd_list.list); |
ab841160 OW |
269 | } |
270 | ||
271 | ||
272 | } else { | |
273 | dev_dbg(&dev->pdev->dev, "Queuing the connect request due to device busy\n"); | |
ab841160 | 274 | dev_dbg(&dev->pdev->dev, "add connect cb to control write list.\n"); |
fb601adb | 275 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
ab841160 OW |
276 | } |
277 | mutex_unlock(&dev->device_lock); | |
278 | err = wait_event_timeout(dev->wait_recvd_msg, | |
279 | (MEI_FILE_CONNECTED == cl->state || | |
3870c320 | 280 | MEI_FILE_DISCONNECTED == cl->state), timeout); |
ab841160 OW |
281 | |
282 | mutex_lock(&dev->device_lock); | |
283 | if (MEI_FILE_CONNECTED == cl->state) { | |
284 | dev_dbg(&dev->pdev->dev, "successfully connected to FW client.\n"); | |
285 | rets = cl->status; | |
286 | goto end; | |
287 | } else { | |
288 | dev_dbg(&dev->pdev->dev, "failed to connect to FW client.cl->state = %d.\n", | |
289 | cl->state); | |
290 | if (!err) { | |
291 | dev_dbg(&dev->pdev->dev, | |
292 | "wait_event_interruptible_timeout failed on client" | |
293 | " connect message fw response message.\n"); | |
294 | } | |
295 | rets = -EFAULT; | |
296 | ||
0288c7c9 TW |
297 | mei_io_list_flush(&dev->ctrl_rd_list, cl); |
298 | mei_io_list_flush(&dev->ctrl_wr_list, cl); | |
ab841160 OW |
299 | goto end; |
300 | } | |
301 | rets = 0; | |
302 | end: | |
303 | dev_dbg(&dev->pdev->dev, "free connect cb memory."); | |
601a1efa | 304 | mei_io_cb_free(cb); |
ab841160 OW |
305 | return rets; |
306 | } | |
307 | ||
ab841160 OW |
308 | /** |
309 | * mei_start_read - the start read client message function. | |
310 | * | |
311 | * @dev: the device structure | |
312 | * @if_num: minor number | |
313 | * @cl: private data of the file object | |
314 | * | |
315 | * returns 0 on success, <0 on failure. | |
316 | */ | |
317 | int mei_start_read(struct mei_device *dev, struct mei_cl *cl) | |
318 | { | |
319 | struct mei_cl_cb *cb; | |
664df38b | 320 | int rets; |
ab841160 OW |
321 | int i; |
322 | ||
323 | if (cl->state != MEI_FILE_CONNECTED) | |
324 | return -ENODEV; | |
325 | ||
b210d750 | 326 | if (dev->dev_state != MEI_DEV_ENABLED) |
ab841160 OW |
327 | return -ENODEV; |
328 | ||
ab841160 OW |
329 | if (cl->read_pending || cl->read_cb) { |
330 | dev_dbg(&dev->pdev->dev, "read is pending.\n"); | |
331 | return -EBUSY; | |
332 | } | |
664df38b TW |
333 | i = mei_me_cl_by_id(dev, cl->me_client_id); |
334 | if (i < 0) { | |
335 | dev_err(&dev->pdev->dev, "no such me client %d\n", | |
336 | cl->me_client_id); | |
337 | return -ENODEV; | |
338 | } | |
ab841160 | 339 | |
664df38b | 340 | cb = mei_io_cb_init(cl, NULL); |
ab841160 OW |
341 | if (!cb) |
342 | return -ENOMEM; | |
343 | ||
664df38b TW |
344 | rets = mei_io_cb_alloc_resp_buf(cb, |
345 | dev->me_clients[i].props.max_msg_length); | |
346 | if (rets) | |
347 | goto err; | |
ab841160 | 348 | |
4b8960b4 | 349 | cb->fop_type = MEI_FOP_READ; |
ab841160 OW |
350 | cl->read_cb = cb; |
351 | if (dev->mei_host_buffer_is_empty) { | |
eb9af0ac | 352 | dev->mei_host_buffer_is_empty = false; |
8120e720 | 353 | if (mei_hbm_cl_flow_control_req(dev, cl)) { |
ab841160 | 354 | rets = -ENODEV; |
664df38b | 355 | goto err; |
ab841160 | 356 | } |
fb601adb | 357 | list_add_tail(&cb->list, &dev->read_list.list); |
ab841160 | 358 | } else { |
fb601adb | 359 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
ab841160 OW |
360 | } |
361 | return rets; | |
664df38b | 362 | err: |
601a1efa | 363 | mei_io_cb_free(cb); |
ab841160 OW |
364 | return rets; |
365 | } | |
366 |