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Commit | Line | Data |
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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 | */ | |
ab841160 OW |
16 | #include <linux/module.h> |
17 | #include <linux/moduleparam.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/device.h> | |
1f180359 | 20 | #include <linux/slab.h> |
ab841160 OW |
21 | #include <linux/fs.h> |
22 | #include <linux/errno.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/fcntl.h> | |
ab841160 OW |
25 | #include <linux/poll.h> |
26 | #include <linux/init.h> | |
27 | #include <linux/ioctl.h> | |
28 | #include <linux/cdev.h> | |
ab841160 OW |
29 | #include <linux/sched.h> |
30 | #include <linux/uuid.h> | |
31 | #include <linux/compat.h> | |
32 | #include <linux/jiffies.h> | |
33 | #include <linux/interrupt.h> | |
34 | ||
4f3afe1d | 35 | #include <linux/mei.h> |
47a73801 TW |
36 | |
37 | #include "mei_dev.h" | |
90e0b5f1 | 38 | #include "client.h" |
ab841160 | 39 | |
ab841160 OW |
40 | /** |
41 | * mei_open - the open function | |
42 | * | |
43 | * @inode: pointer to inode structure | |
44 | * @file: pointer to file structure | |
83ce0741 | 45 | * |
a8605ea2 | 46 | * Return: 0 on success, <0 on error |
ab841160 OW |
47 | */ |
48 | static int mei_open(struct inode *inode, struct file *file) | |
49 | { | |
ab841160 | 50 | struct mei_device *dev; |
f3d8e878 | 51 | struct mei_cl *cl; |
2703d4b2 | 52 | |
6f37aca8 | 53 | int err; |
ab841160 | 54 | |
f3d8e878 | 55 | dev = container_of(inode->i_cdev, struct mei_device, cdev); |
5b881e3c | 56 | if (!dev) |
e036cc57 | 57 | return -ENODEV; |
ab841160 OW |
58 | |
59 | mutex_lock(&dev->device_lock); | |
e036cc57 | 60 | |
b210d750 | 61 | if (dev->dev_state != MEI_DEV_ENABLED) { |
2bf94cab | 62 | dev_dbg(dev->dev, "dev_state != MEI_ENABLED dev_state = %s\n", |
b210d750 | 63 | mei_dev_state_str(dev->dev_state)); |
03b8d341 | 64 | err = -ENODEV; |
e036cc57 | 65 | goto err_unlock; |
1b812947 | 66 | } |
ab841160 | 67 | |
7851e008 | 68 | cl = mei_cl_alloc_linked(dev); |
03b8d341 TW |
69 | if (IS_ERR(cl)) { |
70 | err = PTR_ERR(cl); | |
e036cc57 | 71 | goto err_unlock; |
03b8d341 | 72 | } |
ab841160 OW |
73 | |
74 | file->private_data = cl; | |
e036cc57 | 75 | |
ab841160 OW |
76 | mutex_unlock(&dev->device_lock); |
77 | ||
5b881e3c | 78 | return nonseekable_open(inode, file); |
ab841160 | 79 | |
e036cc57 | 80 | err_unlock: |
ab841160 | 81 | mutex_unlock(&dev->device_lock); |
ab841160 OW |
82 | return err; |
83 | } | |
84 | ||
85 | /** | |
86 | * mei_release - the release function | |
87 | * | |
88 | * @inode: pointer to inode structure | |
89 | * @file: pointer to file structure | |
90 | * | |
a8605ea2 | 91 | * Return: 0 on success, <0 on error |
ab841160 OW |
92 | */ |
93 | static int mei_release(struct inode *inode, struct file *file) | |
94 | { | |
95 | struct mei_cl *cl = file->private_data; | |
ab841160 | 96 | struct mei_device *dev; |
3c666182 | 97 | int rets; |
ab841160 OW |
98 | |
99 | if (WARN_ON(!cl || !cl->dev)) | |
100 | return -ENODEV; | |
101 | ||
102 | dev = cl->dev; | |
103 | ||
104 | mutex_lock(&dev->device_lock); | |
a562d5c2 TW |
105 | if (cl == &dev->iamthif_cl) { |
106 | rets = mei_amthif_release(dev, file); | |
107 | goto out; | |
108 | } | |
3c666182 TW |
109 | rets = mei_cl_disconnect(cl); |
110 | ||
a9bed610 | 111 | mei_cl_flush_queues(cl, file); |
46922186 | 112 | cl_dbg(dev, cl, "removing\n"); |
a562d5c2 | 113 | |
90e0b5f1 | 114 | mei_cl_unlink(cl); |
a562d5c2 | 115 | |
a562d5c2 | 116 | file->private_data = NULL; |
ab841160 | 117 | |
a562d5c2 TW |
118 | kfree(cl); |
119 | out: | |
ab841160 OW |
120 | mutex_unlock(&dev->device_lock); |
121 | return rets; | |
122 | } | |
123 | ||
124 | ||
125 | /** | |
126 | * mei_read - the read function. | |
127 | * | |
128 | * @file: pointer to file structure | |
129 | * @ubuf: pointer to user buffer | |
130 | * @length: buffer length | |
131 | * @offset: data offset in buffer | |
132 | * | |
a8605ea2 | 133 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
134 | */ |
135 | static ssize_t mei_read(struct file *file, char __user *ubuf, | |
441ab50f | 136 | size_t length, loff_t *offset) |
ab841160 OW |
137 | { |
138 | struct mei_cl *cl = file->private_data; | |
ab841160 | 139 | struct mei_device *dev; |
a9bed610 | 140 | struct mei_cl_cb *cb = NULL; |
ab841160 OW |
141 | int rets; |
142 | int err; | |
143 | ||
144 | ||
145 | if (WARN_ON(!cl || !cl->dev)) | |
146 | return -ENODEV; | |
147 | ||
148 | dev = cl->dev; | |
149 | ||
dd5de1f1 | 150 | |
ab841160 | 151 | mutex_lock(&dev->device_lock); |
b210d750 | 152 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
153 | rets = -ENODEV; |
154 | goto out; | |
155 | } | |
156 | ||
dd5de1f1 TW |
157 | if (length == 0) { |
158 | rets = 0; | |
159 | goto out; | |
160 | } | |
161 | ||
8b2458f4 AU |
162 | if (ubuf == NULL) { |
163 | rets = -EMSGSIZE; | |
164 | goto out; | |
165 | } | |
166 | ||
ab841160 | 167 | if (cl == &dev->iamthif_cl) { |
19838fb8 | 168 | rets = mei_amthif_read(dev, file, ubuf, length, offset); |
ab841160 OW |
169 | goto out; |
170 | } | |
171 | ||
a9bed610 | 172 | cb = mei_cl_read_cb(cl, file); |
8b2458f4 AU |
173 | if (cb) |
174 | goto copy_buffer; | |
175 | ||
176 | if (*offset > 0) | |
ab841160 | 177 | *offset = 0; |
ab841160 | 178 | |
bca67d68 | 179 | err = mei_cl_read_start(cl, length, file); |
ab841160 | 180 | if (err && err != -EBUSY) { |
292f82c8 | 181 | cl_dbg(dev, cl, "mei start read failure status = %d\n", err); |
ab841160 OW |
182 | rets = err; |
183 | goto out; | |
184 | } | |
185 | ||
1eb5bd4d AU |
186 | /* synchronized under device mutex */ |
187 | if (!waitqueue_active(&cl->rx_wait)) { | |
ab841160 OW |
188 | if (file->f_flags & O_NONBLOCK) { |
189 | rets = -EAGAIN; | |
190 | goto out; | |
191 | } | |
192 | ||
193 | mutex_unlock(&dev->device_lock); | |
194 | ||
195 | if (wait_event_interruptible(cl->rx_wait, | |
a9bed610 | 196 | (!list_empty(&cl->rd_completed)) || |
6a84d63d | 197 | (!mei_cl_is_connected(cl)))) { |
e2b31644 | 198 | |
ab841160 OW |
199 | if (signal_pending(current)) |
200 | return -EINTR; | |
201 | return -ERESTARTSYS; | |
202 | } | |
203 | ||
204 | mutex_lock(&dev->device_lock); | |
6a84d63d | 205 | if (!mei_cl_is_connected(cl)) { |
2d4d5481 | 206 | rets = -ENODEV; |
ab841160 OW |
207 | goto out; |
208 | } | |
209 | } | |
210 | ||
a9bed610 | 211 | cb = mei_cl_read_cb(cl, file); |
ab841160 | 212 | if (!cb) { |
ab841160 OW |
213 | rets = 0; |
214 | goto out; | |
215 | } | |
3d33ff24 | 216 | |
ab841160 | 217 | copy_buffer: |
3d33ff24 TW |
218 | /* now copy the data to user space */ |
219 | if (cb->status) { | |
220 | rets = cb->status; | |
292f82c8 | 221 | cl_dbg(dev, cl, "read operation failed %d\n", rets); |
3d33ff24 TW |
222 | goto free; |
223 | } | |
224 | ||
35bf7692 | 225 | cl_dbg(dev, cl, "buf.size = %zu buf.idx = %zu offset = %lld\n", |
8b2458f4 AU |
226 | cb->buf.size, cb->buf_idx, *offset); |
227 | if (*offset >= cb->buf_idx) { | |
228 | rets = 0; | |
ab841160 OW |
229 | goto free; |
230 | } | |
231 | ||
ebb108ef TW |
232 | /* length is being truncated to PAGE_SIZE, |
233 | * however buf_idx may point beyond that */ | |
234 | length = min_t(size_t, length, cb->buf_idx - *offset); | |
ab841160 | 235 | |
5db7514d | 236 | if (copy_to_user(ubuf, cb->buf.data + *offset, length)) { |
2bf94cab | 237 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
ab841160 OW |
238 | rets = -EFAULT; |
239 | goto free; | |
240 | } | |
241 | ||
242 | rets = length; | |
243 | *offset += length; | |
f862b6b2 TW |
244 | /* not all data was read, keep the cb */ |
245 | if (*offset < cb->buf_idx) | |
ab841160 OW |
246 | goto out; |
247 | ||
248 | free: | |
601a1efa | 249 | mei_io_cb_free(cb); |
8b2458f4 | 250 | *offset = 0; |
928fa666 | 251 | |
ab841160 | 252 | out: |
292f82c8 | 253 | cl_dbg(dev, cl, "end mei read rets = %d\n", rets); |
ab841160 OW |
254 | mutex_unlock(&dev->device_lock); |
255 | return rets; | |
256 | } | |
ab841160 OW |
257 | /** |
258 | * mei_write - the write function. | |
259 | * | |
260 | * @file: pointer to file structure | |
261 | * @ubuf: pointer to user buffer | |
262 | * @length: buffer length | |
263 | * @offset: data offset in buffer | |
264 | * | |
a8605ea2 | 265 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
266 | */ |
267 | static ssize_t mei_write(struct file *file, const char __user *ubuf, | |
441ab50f | 268 | size_t length, loff_t *offset) |
ab841160 OW |
269 | { |
270 | struct mei_cl *cl = file->private_data; | |
6cbb097f | 271 | struct mei_cl_cb *cb; |
ab841160 | 272 | struct mei_device *dev; |
ab841160 | 273 | int rets; |
ab841160 OW |
274 | |
275 | if (WARN_ON(!cl || !cl->dev)) | |
276 | return -ENODEV; | |
277 | ||
278 | dev = cl->dev; | |
279 | ||
280 | mutex_lock(&dev->device_lock); | |
281 | ||
b210d750 | 282 | if (dev->dev_state != MEI_DEV_ENABLED) { |
75f0ee15 | 283 | rets = -ENODEV; |
4234a6de | 284 | goto out; |
ab841160 OW |
285 | } |
286 | ||
d49ed64a AU |
287 | if (!mei_cl_is_connected(cl)) { |
288 | cl_err(dev, cl, "is not connected"); | |
289 | rets = -ENODEV; | |
4234a6de | 290 | goto out; |
75f0ee15 | 291 | } |
dd5de1f1 | 292 | |
d49ed64a AU |
293 | if (!mei_me_cl_is_active(cl->me_cl)) { |
294 | rets = -ENOTTY; | |
dd5de1f1 TW |
295 | goto out; |
296 | } | |
297 | ||
d49ed64a | 298 | if (length > mei_cl_mtu(cl)) { |
dd5de1f1 | 299 | rets = -EFBIG; |
4234a6de | 300 | goto out; |
75f0ee15 TW |
301 | } |
302 | ||
d49ed64a AU |
303 | if (length == 0) { |
304 | rets = 0; | |
4234a6de | 305 | goto out; |
75f0ee15 | 306 | } |
d49ed64a | 307 | |
a9bed610 | 308 | *offset = 0; |
6cbb097f AU |
309 | cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file); |
310 | if (!cb) { | |
33d28c92 | 311 | rets = -ENOMEM; |
4234a6de | 312 | goto out; |
ab841160 | 313 | } |
ab841160 | 314 | |
6cbb097f | 315 | rets = copy_from_user(cb->buf.data, ubuf, length); |
d8b29efa | 316 | if (rets) { |
2bf94cab | 317 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
d8b29efa | 318 | rets = -EFAULT; |
6cbb097f | 319 | mei_io_cb_free(cb); |
4234a6de | 320 | goto out; |
d8b29efa | 321 | } |
ab841160 | 322 | |
ab841160 | 323 | if (cl == &dev->iamthif_cl) { |
6cbb097f AU |
324 | rets = mei_amthif_write(cl, cb); |
325 | if (!rets) | |
326 | rets = length; | |
327 | goto out; | |
ab841160 OW |
328 | } |
329 | ||
6cbb097f | 330 | rets = mei_cl_write(cl, cb, false); |
b0d0cf77 | 331 | out: |
ab841160 | 332 | mutex_unlock(&dev->device_lock); |
ab841160 OW |
333 | return rets; |
334 | } | |
335 | ||
9f81abda TW |
336 | /** |
337 | * mei_ioctl_connect_client - the connect to fw client IOCTL function | |
338 | * | |
9f81abda | 339 | * @file: private data of the file object |
a8605ea2 | 340 | * @data: IOCTL connect data, input and output parameters |
9f81abda TW |
341 | * |
342 | * Locking: called under "dev->device_lock" lock | |
343 | * | |
a8605ea2 | 344 | * Return: 0 on success, <0 on failure. |
9f81abda TW |
345 | */ |
346 | static int mei_ioctl_connect_client(struct file *file, | |
347 | struct mei_connect_client_data *data) | |
348 | { | |
349 | struct mei_device *dev; | |
350 | struct mei_client *client; | |
d320832f | 351 | struct mei_me_client *me_cl; |
9f81abda | 352 | struct mei_cl *cl; |
9f81abda TW |
353 | int rets; |
354 | ||
355 | cl = file->private_data; | |
9f81abda TW |
356 | dev = cl->dev; |
357 | ||
79563db9 TW |
358 | if (dev->dev_state != MEI_DEV_ENABLED) |
359 | return -ENODEV; | |
9f81abda TW |
360 | |
361 | if (cl->state != MEI_FILE_INITIALIZING && | |
79563db9 TW |
362 | cl->state != MEI_FILE_DISCONNECTED) |
363 | return -EBUSY; | |
9f81abda TW |
364 | |
365 | /* find ME client we're trying to connect to */ | |
d320832f | 366 | me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid); |
f4e06246 | 367 | if (!me_cl) { |
2bf94cab | 368 | dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n", |
d49ed64a | 369 | &data->in_client_uuid); |
f4e06246 AU |
370 | rets = -ENOTTY; |
371 | goto end; | |
372 | } | |
373 | ||
374 | if (me_cl->props.fixed_address) { | |
375 | bool forbidden = dev->override_fixed_address ? | |
376 | !dev->allow_fixed_address : !dev->hbm_f_fa_supported; | |
377 | if (forbidden) { | |
378 | dev_dbg(dev->dev, "Connection forbidden to FW Client UUID = %pUl\n", | |
379 | &data->in_client_uuid); | |
380 | rets = -ENOTTY; | |
381 | goto end; | |
382 | } | |
9f81abda TW |
383 | } |
384 | ||
2bf94cab | 385 | dev_dbg(dev->dev, "Connect to FW Client ID = %d\n", |
d49ed64a | 386 | me_cl->client_id); |
2bf94cab | 387 | dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n", |
d320832f | 388 | me_cl->props.protocol_version); |
2bf94cab | 389 | dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n", |
d320832f | 390 | me_cl->props.max_msg_length); |
9f81abda | 391 | |
1a1aca42 | 392 | /* if we're connecting to amthif client then we will use the |
9f81abda TW |
393 | * existing connection |
394 | */ | |
1a1aca42 | 395 | if (uuid_le_cmp(data->in_client_uuid, mei_amthif_guid) == 0) { |
2bf94cab | 396 | dev_dbg(dev->dev, "FW Client is amthi\n"); |
f3de9b63 | 397 | if (!mei_cl_is_connected(&dev->iamthif_cl)) { |
9f81abda TW |
398 | rets = -ENODEV; |
399 | goto end; | |
400 | } | |
9f81abda TW |
401 | mei_cl_unlink(cl); |
402 | ||
403 | kfree(cl); | |
404 | cl = NULL; | |
22f96a0e | 405 | dev->iamthif_open_count++; |
9f81abda TW |
406 | file->private_data = &dev->iamthif_cl; |
407 | ||
408 | client = &data->out_client_properties; | |
d320832f TW |
409 | client->max_msg_length = me_cl->props.max_msg_length; |
410 | client->protocol_version = me_cl->props.protocol_version; | |
9f81abda TW |
411 | rets = dev->iamthif_cl.status; |
412 | ||
413 | goto end; | |
414 | } | |
415 | ||
9f81abda TW |
416 | /* prepare the output buffer */ |
417 | client = &data->out_client_properties; | |
d320832f TW |
418 | client->max_msg_length = me_cl->props.max_msg_length; |
419 | client->protocol_version = me_cl->props.protocol_version; | |
2bf94cab | 420 | dev_dbg(dev->dev, "Can connect?\n"); |
9f81abda | 421 | |
d49ed64a | 422 | rets = mei_cl_connect(cl, me_cl, file); |
9f81abda TW |
423 | |
424 | end: | |
79563db9 | 425 | mei_me_cl_put(me_cl); |
9f81abda TW |
426 | return rets; |
427 | } | |
428 | ||
3c7c8468 TW |
429 | /** |
430 | * mei_ioctl_client_notify_request - | |
431 | * propagate event notification request to client | |
432 | * | |
433 | * @file: pointer to file structure | |
434 | * @request: 0 - disable, 1 - enable | |
435 | * | |
436 | * Return: 0 on success , <0 on error | |
437 | */ | |
f23e2cc4 | 438 | static int mei_ioctl_client_notify_request(const struct file *file, u32 request) |
3c7c8468 TW |
439 | { |
440 | struct mei_cl *cl = file->private_data; | |
441 | ||
7326fffb AU |
442 | if (request != MEI_HBM_NOTIFICATION_START && |
443 | request != MEI_HBM_NOTIFICATION_STOP) | |
444 | return -EINVAL; | |
445 | ||
446 | return mei_cl_notify_request(cl, file, (u8)request); | |
3c7c8468 TW |
447 | } |
448 | ||
449 | /** | |
450 | * mei_ioctl_client_notify_get - wait for notification request | |
451 | * | |
452 | * @file: pointer to file structure | |
453 | * @notify_get: 0 - disable, 1 - enable | |
454 | * | |
455 | * Return: 0 on success , <0 on error | |
456 | */ | |
f23e2cc4 | 457 | static int mei_ioctl_client_notify_get(const struct file *file, u32 *notify_get) |
3c7c8468 TW |
458 | { |
459 | struct mei_cl *cl = file->private_data; | |
460 | bool notify_ev; | |
461 | bool block = (file->f_flags & O_NONBLOCK) == 0; | |
462 | int rets; | |
463 | ||
464 | rets = mei_cl_notify_get(cl, block, ¬ify_ev); | |
465 | if (rets) | |
466 | return rets; | |
467 | ||
468 | *notify_get = notify_ev ? 1 : 0; | |
469 | return 0; | |
470 | } | |
471 | ||
ab841160 OW |
472 | /** |
473 | * mei_ioctl - the IOCTL function | |
474 | * | |
475 | * @file: pointer to file structure | |
476 | * @cmd: ioctl command | |
477 | * @data: pointer to mei message structure | |
478 | * | |
a8605ea2 | 479 | * Return: 0 on success , <0 on error |
ab841160 OW |
480 | */ |
481 | static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data) | |
482 | { | |
483 | struct mei_device *dev; | |
484 | struct mei_cl *cl = file->private_data; | |
154eb18f | 485 | struct mei_connect_client_data connect_data; |
3c7c8468 | 486 | u32 notify_get, notify_req; |
ab841160 OW |
487 | int rets; |
488 | ||
ab841160 OW |
489 | |
490 | if (WARN_ON(!cl || !cl->dev)) | |
491 | return -ENODEV; | |
492 | ||
493 | dev = cl->dev; | |
494 | ||
2bf94cab | 495 | dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd); |
ab841160 OW |
496 | |
497 | mutex_lock(&dev->device_lock); | |
b210d750 | 498 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
499 | rets = -ENODEV; |
500 | goto out; | |
501 | } | |
502 | ||
4f046e7b TW |
503 | switch (cmd) { |
504 | case IOCTL_MEI_CONNECT_CLIENT: | |
2bf94cab | 505 | dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n"); |
154eb18f | 506 | if (copy_from_user(&connect_data, (char __user *)data, |
4f046e7b | 507 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 508 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
4f046e7b TW |
509 | rets = -EFAULT; |
510 | goto out; | |
511 | } | |
ab841160 | 512 | |
154eb18f | 513 | rets = mei_ioctl_connect_client(file, &connect_data); |
4f046e7b TW |
514 | if (rets) |
515 | goto out; | |
ab841160 | 516 | |
4f046e7b | 517 | /* if all is ok, copying the data back to user. */ |
154eb18f | 518 | if (copy_to_user((char __user *)data, &connect_data, |
ab841160 | 519 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 520 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
4f046e7b TW |
521 | rets = -EFAULT; |
522 | goto out; | |
523 | } | |
524 | ||
525 | break; | |
154eb18f | 526 | |
3c7c8468 TW |
527 | case IOCTL_MEI_NOTIFY_SET: |
528 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_SET.\n"); | |
529 | if (copy_from_user(¬ify_req, | |
530 | (char __user *)data, sizeof(notify_req))) { | |
531 | dev_dbg(dev->dev, "failed to copy data from userland\n"); | |
532 | rets = -EFAULT; | |
533 | goto out; | |
534 | } | |
535 | rets = mei_ioctl_client_notify_request(file, notify_req); | |
536 | break; | |
537 | ||
538 | case IOCTL_MEI_NOTIFY_GET: | |
539 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_GET.\n"); | |
540 | rets = mei_ioctl_client_notify_get(file, ¬ify_get); | |
541 | if (rets) | |
542 | goto out; | |
543 | ||
544 | dev_dbg(dev->dev, "copy connect data to user\n"); | |
545 | if (copy_to_user((char __user *)data, | |
546 | ¬ify_get, sizeof(notify_get))) { | |
547 | dev_dbg(dev->dev, "failed to copy data to userland\n"); | |
548 | rets = -EFAULT; | |
549 | goto out; | |
550 | ||
551 | } | |
552 | break; | |
553 | ||
4f046e7b | 554 | default: |
2bf94cab | 555 | dev_err(dev->dev, ": unsupported ioctl %d.\n", cmd); |
4f046e7b | 556 | rets = -ENOIOCTLCMD; |
ab841160 OW |
557 | } |
558 | ||
559 | out: | |
ab841160 OW |
560 | mutex_unlock(&dev->device_lock); |
561 | return rets; | |
562 | } | |
563 | ||
564 | /** | |
565 | * mei_compat_ioctl - the compat IOCTL function | |
566 | * | |
567 | * @file: pointer to file structure | |
568 | * @cmd: ioctl command | |
569 | * @data: pointer to mei message structure | |
570 | * | |
a8605ea2 | 571 | * Return: 0 on success , <0 on error |
ab841160 OW |
572 | */ |
573 | #ifdef CONFIG_COMPAT | |
574 | static long mei_compat_ioctl(struct file *file, | |
441ab50f | 575 | unsigned int cmd, unsigned long data) |
ab841160 OW |
576 | { |
577 | return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data)); | |
578 | } | |
579 | #endif | |
580 | ||
581 | ||
582 | /** | |
583 | * mei_poll - the poll function | |
584 | * | |
585 | * @file: pointer to file structure | |
586 | * @wait: pointer to poll_table structure | |
587 | * | |
a8605ea2 | 588 | * Return: poll mask |
ab841160 OW |
589 | */ |
590 | static unsigned int mei_poll(struct file *file, poll_table *wait) | |
591 | { | |
1d9013f0 | 592 | unsigned long req_events = poll_requested_events(wait); |
ab841160 OW |
593 | struct mei_cl *cl = file->private_data; |
594 | struct mei_device *dev; | |
595 | unsigned int mask = 0; | |
2c84c297 | 596 | bool notify_en; |
ab841160 OW |
597 | |
598 | if (WARN_ON(!cl || !cl->dev)) | |
b950ac1d | 599 | return POLLERR; |
ab841160 OW |
600 | |
601 | dev = cl->dev; | |
602 | ||
603 | mutex_lock(&dev->device_lock); | |
604 | ||
2c84c297 | 605 | notify_en = cl->notify_en && (req_events & POLLPRI); |
f3de9b63 TW |
606 | |
607 | if (dev->dev_state != MEI_DEV_ENABLED || | |
608 | !mei_cl_is_connected(cl)) { | |
b950ac1d | 609 | mask = POLLERR; |
ab841160 OW |
610 | goto out; |
611 | } | |
612 | ||
2c84c297 TW |
613 | if (notify_en) { |
614 | poll_wait(file, &cl->ev_wait, wait); | |
615 | if (cl->notify_ev) | |
616 | mask |= POLLPRI; | |
617 | } | |
9fa0be8b AU |
618 | |
619 | if (cl == &dev->iamthif_cl) { | |
620 | mask |= mei_amthif_poll(file, wait); | |
621 | goto out; | |
622 | } | |
2c84c297 | 623 | |
1d9013f0 TW |
624 | if (req_events & (POLLIN | POLLRDNORM)) { |
625 | poll_wait(file, &cl->rx_wait, wait); | |
626 | ||
627 | if (!list_empty(&cl->rd_completed)) | |
628 | mask |= POLLIN | POLLRDNORM; | |
629 | else | |
630 | mei_cl_read_start(cl, 0, file); | |
631 | } | |
ab841160 OW |
632 | |
633 | out: | |
634 | mutex_unlock(&dev->device_lock); | |
635 | return mask; | |
636 | } | |
637 | ||
237092bf TW |
638 | /** |
639 | * mei_fasync - asynchronous io support | |
640 | * | |
641 | * @fd: file descriptor | |
642 | * @file: pointer to file structure | |
643 | * @band: band bitmap | |
644 | * | |
ed6dc538 TW |
645 | * Return: negative on error, |
646 | * 0 if it did no changes, | |
647 | * and positive a process was added or deleted | |
237092bf TW |
648 | */ |
649 | static int mei_fasync(int fd, struct file *file, int band) | |
650 | { | |
651 | ||
652 | struct mei_cl *cl = file->private_data; | |
653 | ||
654 | if (!mei_cl_is_connected(cl)) | |
ed6dc538 | 655 | return -ENODEV; |
237092bf TW |
656 | |
657 | return fasync_helper(fd, file, band, &cl->ev_async); | |
658 | } | |
659 | ||
55c4e640 TW |
660 | /** |
661 | * fw_status_show - mei device attribute show method | |
662 | * | |
663 | * @device: device pointer | |
664 | * @attr: attribute pointer | |
665 | * @buf: char out buffer | |
666 | * | |
667 | * Return: number of the bytes printed into buf or error | |
668 | */ | |
669 | static ssize_t fw_status_show(struct device *device, | |
670 | struct device_attribute *attr, char *buf) | |
671 | { | |
672 | struct mei_device *dev = dev_get_drvdata(device); | |
673 | struct mei_fw_status fw_status; | |
674 | int err, i; | |
675 | ssize_t cnt = 0; | |
676 | ||
677 | mutex_lock(&dev->device_lock); | |
678 | err = mei_fw_status(dev, &fw_status); | |
679 | mutex_unlock(&dev->device_lock); | |
680 | if (err) { | |
681 | dev_err(device, "read fw_status error = %d\n", err); | |
682 | return err; | |
683 | } | |
684 | ||
685 | for (i = 0; i < fw_status.count; i++) | |
686 | cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n", | |
687 | fw_status.status[i]); | |
688 | return cnt; | |
689 | } | |
690 | static DEVICE_ATTR_RO(fw_status); | |
691 | ||
692 | static struct attribute *mei_attrs[] = { | |
693 | &dev_attr_fw_status.attr, | |
694 | NULL | |
695 | }; | |
696 | ATTRIBUTE_GROUPS(mei); | |
697 | ||
5b881e3c OW |
698 | /* |
699 | * file operations structure will be used for mei char device. | |
700 | */ | |
701 | static const struct file_operations mei_fops = { | |
702 | .owner = THIS_MODULE, | |
703 | .read = mei_read, | |
704 | .unlocked_ioctl = mei_ioctl, | |
705 | #ifdef CONFIG_COMPAT | |
706 | .compat_ioctl = mei_compat_ioctl, | |
707 | #endif | |
708 | .open = mei_open, | |
709 | .release = mei_release, | |
710 | .write = mei_write, | |
711 | .poll = mei_poll, | |
237092bf | 712 | .fasync = mei_fasync, |
5b881e3c OW |
713 | .llseek = no_llseek |
714 | }; | |
715 | ||
f3d8e878 AU |
716 | static struct class *mei_class; |
717 | static dev_t mei_devt; | |
718 | #define MEI_MAX_DEVS MINORMASK | |
719 | static DEFINE_MUTEX(mei_minor_lock); | |
720 | static DEFINE_IDR(mei_idr); | |
721 | ||
722 | /** | |
723 | * mei_minor_get - obtain next free device minor number | |
724 | * | |
725 | * @dev: device pointer | |
726 | * | |
a8605ea2 | 727 | * Return: allocated minor, or -ENOSPC if no free minor left |
5b881e3c | 728 | */ |
f3d8e878 AU |
729 | static int mei_minor_get(struct mei_device *dev) |
730 | { | |
731 | int ret; | |
732 | ||
733 | mutex_lock(&mei_minor_lock); | |
734 | ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL); | |
735 | if (ret >= 0) | |
736 | dev->minor = ret; | |
737 | else if (ret == -ENOSPC) | |
2bf94cab | 738 | dev_err(dev->dev, "too many mei devices\n"); |
5b881e3c | 739 | |
f3d8e878 AU |
740 | mutex_unlock(&mei_minor_lock); |
741 | return ret; | |
742 | } | |
30e53bb8 | 743 | |
f3d8e878 AU |
744 | /** |
745 | * mei_minor_free - mark device minor number as free | |
746 | * | |
747 | * @dev: device pointer | |
748 | */ | |
749 | static void mei_minor_free(struct mei_device *dev) | |
9a123f19 | 750 | { |
f3d8e878 AU |
751 | mutex_lock(&mei_minor_lock); |
752 | idr_remove(&mei_idr, dev->minor); | |
753 | mutex_unlock(&mei_minor_lock); | |
754 | } | |
755 | ||
756 | int mei_register(struct mei_device *dev, struct device *parent) | |
757 | { | |
758 | struct device *clsdev; /* class device */ | |
759 | int ret, devno; | |
760 | ||
761 | ret = mei_minor_get(dev); | |
762 | if (ret < 0) | |
30e53bb8 TW |
763 | return ret; |
764 | ||
f3d8e878 AU |
765 | /* Fill in the data structures */ |
766 | devno = MKDEV(MAJOR(mei_devt), dev->minor); | |
767 | cdev_init(&dev->cdev, &mei_fops); | |
154322f4 | 768 | dev->cdev.owner = parent->driver->owner; |
f3d8e878 AU |
769 | |
770 | /* Add the device */ | |
771 | ret = cdev_add(&dev->cdev, devno, 1); | |
772 | if (ret) { | |
773 | dev_err(parent, "unable to add device %d:%d\n", | |
774 | MAJOR(mei_devt), dev->minor); | |
775 | goto err_dev_add; | |
776 | } | |
777 | ||
55c4e640 TW |
778 | clsdev = device_create_with_groups(mei_class, parent, devno, |
779 | dev, mei_groups, | |
780 | "mei%d", dev->minor); | |
f3d8e878 AU |
781 | |
782 | if (IS_ERR(clsdev)) { | |
783 | dev_err(parent, "unable to create device %d:%d\n", | |
784 | MAJOR(mei_devt), dev->minor); | |
785 | ret = PTR_ERR(clsdev); | |
786 | goto err_dev_create; | |
787 | } | |
788 | ||
789 | ret = mei_dbgfs_register(dev, dev_name(clsdev)); | |
790 | if (ret) { | |
791 | dev_err(clsdev, "cannot register debugfs ret = %d\n", ret); | |
792 | goto err_dev_dbgfs; | |
793 | } | |
30e53bb8 TW |
794 | |
795 | return 0; | |
f3d8e878 AU |
796 | |
797 | err_dev_dbgfs: | |
798 | device_destroy(mei_class, devno); | |
799 | err_dev_create: | |
800 | cdev_del(&dev->cdev); | |
801 | err_dev_add: | |
802 | mei_minor_free(dev); | |
803 | return ret; | |
5b881e3c | 804 | } |
40e0b67b | 805 | EXPORT_SYMBOL_GPL(mei_register); |
5b881e3c | 806 | |
30e53bb8 | 807 | void mei_deregister(struct mei_device *dev) |
5b881e3c | 808 | { |
f3d8e878 AU |
809 | int devno; |
810 | ||
811 | devno = dev->cdev.dev; | |
812 | cdev_del(&dev->cdev); | |
813 | ||
30e53bb8 | 814 | mei_dbgfs_deregister(dev); |
f3d8e878 AU |
815 | |
816 | device_destroy(mei_class, devno); | |
817 | ||
818 | mei_minor_free(dev); | |
5b881e3c | 819 | } |
40e0b67b | 820 | EXPORT_SYMBOL_GPL(mei_deregister); |
ab841160 | 821 | |
cf3baefb SO |
822 | static int __init mei_init(void) |
823 | { | |
f3d8e878 AU |
824 | int ret; |
825 | ||
826 | mei_class = class_create(THIS_MODULE, "mei"); | |
827 | if (IS_ERR(mei_class)) { | |
828 | pr_err("couldn't create class\n"); | |
829 | ret = PTR_ERR(mei_class); | |
830 | goto err; | |
831 | } | |
832 | ||
833 | ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei"); | |
834 | if (ret < 0) { | |
835 | pr_err("unable to allocate char dev region\n"); | |
836 | goto err_class; | |
837 | } | |
838 | ||
839 | ret = mei_cl_bus_init(); | |
840 | if (ret < 0) { | |
841 | pr_err("unable to initialize bus\n"); | |
842 | goto err_chrdev; | |
843 | } | |
844 | ||
845 | return 0; | |
846 | ||
847 | err_chrdev: | |
848 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); | |
849 | err_class: | |
850 | class_destroy(mei_class); | |
851 | err: | |
852 | return ret; | |
cf3baefb SO |
853 | } |
854 | ||
855 | static void __exit mei_exit(void) | |
856 | { | |
f3d8e878 AU |
857 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); |
858 | class_destroy(mei_class); | |
cf3baefb SO |
859 | mei_cl_bus_exit(); |
860 | } | |
861 | ||
862 | module_init(mei_init); | |
863 | module_exit(mei_exit); | |
864 | ||
40e0b67b TW |
865 | MODULE_AUTHOR("Intel Corporation"); |
866 | MODULE_DESCRIPTION("Intel(R) Management Engine Interface"); | |
827eef51 | 867 | MODULE_LICENSE("GPL v2"); |
ab841160 | 868 |