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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> | |
174cd4b1 | 29 | #include <linux/sched/signal.h> |
ab841160 OW |
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 | 73 | |
97d549b4 | 74 | cl->fp = file; |
ab841160 | 75 | file->private_data = cl; |
e036cc57 | 76 | |
ab841160 OW |
77 | mutex_unlock(&dev->device_lock); |
78 | ||
5b881e3c | 79 | return nonseekable_open(inode, file); |
ab841160 | 80 | |
e036cc57 | 81 | err_unlock: |
ab841160 | 82 | mutex_unlock(&dev->device_lock); |
ab841160 OW |
83 | return err; |
84 | } | |
85 | ||
86 | /** | |
87 | * mei_release - the release function | |
88 | * | |
89 | * @inode: pointer to inode structure | |
90 | * @file: pointer to file structure | |
91 | * | |
a8605ea2 | 92 | * Return: 0 on success, <0 on error |
ab841160 OW |
93 | */ |
94 | static int mei_release(struct inode *inode, struct file *file) | |
95 | { | |
96 | struct mei_cl *cl = file->private_data; | |
ab841160 | 97 | struct mei_device *dev; |
3c666182 | 98 | int rets; |
ab841160 OW |
99 | |
100 | if (WARN_ON(!cl || !cl->dev)) | |
101 | return -ENODEV; | |
102 | ||
103 | dev = cl->dev; | |
104 | ||
105 | mutex_lock(&dev->device_lock); | |
a562d5c2 TW |
106 | if (cl == &dev->iamthif_cl) { |
107 | rets = mei_amthif_release(dev, file); | |
108 | goto out; | |
109 | } | |
3c666182 TW |
110 | rets = mei_cl_disconnect(cl); |
111 | ||
a9bed610 | 112 | mei_cl_flush_queues(cl, file); |
46922186 | 113 | cl_dbg(dev, cl, "removing\n"); |
a562d5c2 | 114 | |
90e0b5f1 | 115 | mei_cl_unlink(cl); |
a562d5c2 | 116 | |
a562d5c2 | 117 | file->private_data = NULL; |
ab841160 | 118 | |
a562d5c2 TW |
119 | kfree(cl); |
120 | out: | |
ab841160 OW |
121 | mutex_unlock(&dev->device_lock); |
122 | return rets; | |
123 | } | |
124 | ||
125 | ||
126 | /** | |
127 | * mei_read - the read function. | |
128 | * | |
129 | * @file: pointer to file structure | |
130 | * @ubuf: pointer to user buffer | |
131 | * @length: buffer length | |
132 | * @offset: data offset in buffer | |
133 | * | |
a8605ea2 | 134 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
135 | */ |
136 | static ssize_t mei_read(struct file *file, char __user *ubuf, | |
441ab50f | 137 | size_t length, loff_t *offset) |
ab841160 OW |
138 | { |
139 | struct mei_cl *cl = file->private_data; | |
ab841160 | 140 | struct mei_device *dev; |
a9bed610 | 141 | struct mei_cl_cb *cb = NULL; |
ff1586a7 | 142 | bool nonblock = !!(file->f_flags & O_NONBLOCK); |
ab841160 | 143 | int rets; |
ab841160 OW |
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 | ||
a9bed610 | 167 | cb = mei_cl_read_cb(cl, file); |
8b2458f4 AU |
168 | if (cb) |
169 | goto copy_buffer; | |
170 | ||
171 | if (*offset > 0) | |
ab841160 | 172 | *offset = 0; |
ab841160 | 173 | |
ff1586a7 AU |
174 | rets = mei_cl_read_start(cl, length, file); |
175 | if (rets && rets != -EBUSY) { | |
176 | cl_dbg(dev, cl, "mei start read failure status = %d\n", rets); | |
ab841160 OW |
177 | goto out; |
178 | } | |
179 | ||
ff1586a7 AU |
180 | if (nonblock) { |
181 | rets = -EAGAIN; | |
182 | goto out; | |
183 | } | |
184 | ||
ab841160 | 185 | |
cb97fbbc AU |
186 | again: |
187 | mutex_unlock(&dev->device_lock); | |
188 | if (wait_event_interruptible(cl->rx_wait, | |
189 | !list_empty(&cl->rd_completed) || | |
190 | !mei_cl_is_connected(cl))) { | |
191 | if (signal_pending(current)) | |
192 | return -EINTR; | |
193 | return -ERESTARTSYS; | |
194 | } | |
195 | mutex_lock(&dev->device_lock); | |
e2b31644 | 196 | |
cb97fbbc AU |
197 | if (!mei_cl_is_connected(cl)) { |
198 | rets = -ENODEV; | |
199 | goto out; | |
200 | } | |
ab841160 | 201 | |
cb97fbbc AU |
202 | cb = mei_cl_read_cb(cl, file); |
203 | if (!cb) { | |
204 | /* | |
205 | * For amthif all the waiters are woken up, | |
206 | * but only fp with matching cb->fp get the cb, | |
207 | * the others have to return to wait on read. | |
208 | */ | |
209 | if (cl == &dev->iamthif_cl) | |
210 | goto again; | |
ab841160 | 211 | |
cb97fbbc AU |
212 | rets = 0; |
213 | goto out; | |
214 | } | |
3d33ff24 | 215 | |
ab841160 | 216 | copy_buffer: |
3d33ff24 TW |
217 | /* now copy the data to user space */ |
218 | if (cb->status) { | |
219 | rets = cb->status; | |
292f82c8 | 220 | cl_dbg(dev, cl, "read operation failed %d\n", rets); |
3d33ff24 TW |
221 | goto free; |
222 | } | |
223 | ||
35bf7692 | 224 | cl_dbg(dev, cl, "buf.size = %zu buf.idx = %zu offset = %lld\n", |
8b2458f4 AU |
225 | cb->buf.size, cb->buf_idx, *offset); |
226 | if (*offset >= cb->buf_idx) { | |
227 | rets = 0; | |
ab841160 OW |
228 | goto free; |
229 | } | |
230 | ||
ebb108ef TW |
231 | /* length is being truncated to PAGE_SIZE, |
232 | * however buf_idx may point beyond that */ | |
233 | length = min_t(size_t, length, cb->buf_idx - *offset); | |
ab841160 | 234 | |
5db7514d | 235 | if (copy_to_user(ubuf, cb->buf.data + *offset, length)) { |
2bf94cab | 236 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
ab841160 OW |
237 | rets = -EFAULT; |
238 | goto free; | |
239 | } | |
240 | ||
241 | rets = length; | |
242 | *offset += length; | |
f862b6b2 TW |
243 | /* not all data was read, keep the cb */ |
244 | if (*offset < cb->buf_idx) | |
ab841160 OW |
245 | goto out; |
246 | ||
247 | free: | |
601a1efa | 248 | mei_io_cb_free(cb); |
8b2458f4 | 249 | *offset = 0; |
928fa666 | 250 | |
ab841160 | 251 | out: |
292f82c8 | 252 | cl_dbg(dev, cl, "end mei read rets = %d\n", rets); |
ab841160 OW |
253 | mutex_unlock(&dev->device_lock); |
254 | return rets; | |
255 | } | |
ab841160 OW |
256 | /** |
257 | * mei_write - the write function. | |
258 | * | |
259 | * @file: pointer to file structure | |
260 | * @ubuf: pointer to user buffer | |
261 | * @length: buffer length | |
262 | * @offset: data offset in buffer | |
263 | * | |
a8605ea2 | 264 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
265 | */ |
266 | static ssize_t mei_write(struct file *file, const char __user *ubuf, | |
441ab50f | 267 | size_t length, loff_t *offset) |
ab841160 OW |
268 | { |
269 | struct mei_cl *cl = file->private_data; | |
6cbb097f | 270 | struct mei_cl_cb *cb; |
ab841160 | 271 | struct mei_device *dev; |
ab841160 | 272 | int rets; |
ab841160 OW |
273 | |
274 | if (WARN_ON(!cl || !cl->dev)) | |
275 | return -ENODEV; | |
276 | ||
277 | dev = cl->dev; | |
278 | ||
279 | mutex_lock(&dev->device_lock); | |
280 | ||
b210d750 | 281 | if (dev->dev_state != MEI_DEV_ENABLED) { |
75f0ee15 | 282 | rets = -ENODEV; |
4234a6de | 283 | goto out; |
ab841160 OW |
284 | } |
285 | ||
d49ed64a AU |
286 | if (!mei_cl_is_connected(cl)) { |
287 | cl_err(dev, cl, "is not connected"); | |
288 | rets = -ENODEV; | |
4234a6de | 289 | goto out; |
75f0ee15 | 290 | } |
dd5de1f1 | 291 | |
d49ed64a AU |
292 | if (!mei_me_cl_is_active(cl->me_cl)) { |
293 | rets = -ENOTTY; | |
dd5de1f1 TW |
294 | goto out; |
295 | } | |
296 | ||
d49ed64a | 297 | if (length > mei_cl_mtu(cl)) { |
dd5de1f1 | 298 | rets = -EFBIG; |
4234a6de | 299 | goto out; |
75f0ee15 TW |
300 | } |
301 | ||
d49ed64a AU |
302 | if (length == 0) { |
303 | rets = 0; | |
4234a6de | 304 | goto out; |
75f0ee15 | 305 | } |
d49ed64a | 306 | |
a9bed610 | 307 | *offset = 0; |
6cbb097f AU |
308 | cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file); |
309 | if (!cb) { | |
33d28c92 | 310 | rets = -ENOMEM; |
4234a6de | 311 | goto out; |
ab841160 | 312 | } |
ab841160 | 313 | |
6cbb097f | 314 | rets = copy_from_user(cb->buf.data, ubuf, length); |
d8b29efa | 315 | if (rets) { |
2bf94cab | 316 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
d8b29efa | 317 | rets = -EFAULT; |
6cbb097f | 318 | mei_io_cb_free(cb); |
4234a6de | 319 | goto out; |
d8b29efa | 320 | } |
ab841160 | 321 | |
ab841160 | 322 | if (cl == &dev->iamthif_cl) { |
6cbb097f AU |
323 | rets = mei_amthif_write(cl, cb); |
324 | if (!rets) | |
325 | rets = length; | |
326 | goto out; | |
ab841160 OW |
327 | } |
328 | ||
e0cb6b2f | 329 | rets = mei_cl_write(cl, cb); |
b0d0cf77 | 330 | out: |
ab841160 | 331 | mutex_unlock(&dev->device_lock); |
ab841160 OW |
332 | return rets; |
333 | } | |
334 | ||
9f81abda TW |
335 | /** |
336 | * mei_ioctl_connect_client - the connect to fw client IOCTL function | |
337 | * | |
9f81abda | 338 | * @file: private data of the file object |
a8605ea2 | 339 | * @data: IOCTL connect data, input and output parameters |
9f81abda TW |
340 | * |
341 | * Locking: called under "dev->device_lock" lock | |
342 | * | |
a8605ea2 | 343 | * Return: 0 on success, <0 on failure. |
9f81abda TW |
344 | */ |
345 | static int mei_ioctl_connect_client(struct file *file, | |
346 | struct mei_connect_client_data *data) | |
347 | { | |
348 | struct mei_device *dev; | |
349 | struct mei_client *client; | |
d320832f | 350 | struct mei_me_client *me_cl; |
9f81abda | 351 | struct mei_cl *cl; |
9f81abda TW |
352 | int rets; |
353 | ||
354 | cl = file->private_data; | |
9f81abda TW |
355 | dev = cl->dev; |
356 | ||
79563db9 TW |
357 | if (dev->dev_state != MEI_DEV_ENABLED) |
358 | return -ENODEV; | |
9f81abda TW |
359 | |
360 | if (cl->state != MEI_FILE_INITIALIZING && | |
79563db9 TW |
361 | cl->state != MEI_FILE_DISCONNECTED) |
362 | return -EBUSY; | |
9f81abda TW |
363 | |
364 | /* find ME client we're trying to connect to */ | |
d320832f | 365 | me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid); |
f4e06246 | 366 | if (!me_cl) { |
2bf94cab | 367 | dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n", |
d49ed64a | 368 | &data->in_client_uuid); |
f4e06246 AU |
369 | rets = -ENOTTY; |
370 | goto end; | |
371 | } | |
372 | ||
373 | if (me_cl->props.fixed_address) { | |
374 | bool forbidden = dev->override_fixed_address ? | |
375 | !dev->allow_fixed_address : !dev->hbm_f_fa_supported; | |
376 | if (forbidden) { | |
377 | dev_dbg(dev->dev, "Connection forbidden to FW Client UUID = %pUl\n", | |
378 | &data->in_client_uuid); | |
379 | rets = -ENOTTY; | |
380 | goto end; | |
381 | } | |
9f81abda TW |
382 | } |
383 | ||
2bf94cab | 384 | dev_dbg(dev->dev, "Connect to FW Client ID = %d\n", |
d49ed64a | 385 | me_cl->client_id); |
2bf94cab | 386 | dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n", |
d320832f | 387 | me_cl->props.protocol_version); |
2bf94cab | 388 | dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n", |
d320832f | 389 | me_cl->props.max_msg_length); |
9f81abda | 390 | |
1a1aca42 | 391 | /* if we're connecting to amthif client then we will use the |
9f81abda TW |
392 | * existing connection |
393 | */ | |
1a1aca42 | 394 | if (uuid_le_cmp(data->in_client_uuid, mei_amthif_guid) == 0) { |
2bf94cab | 395 | dev_dbg(dev->dev, "FW Client is amthi\n"); |
f3de9b63 | 396 | if (!mei_cl_is_connected(&dev->iamthif_cl)) { |
9f81abda TW |
397 | rets = -ENODEV; |
398 | goto end; | |
399 | } | |
9f81abda TW |
400 | mei_cl_unlink(cl); |
401 | ||
402 | kfree(cl); | |
403 | cl = NULL; | |
22f96a0e | 404 | dev->iamthif_open_count++; |
9f81abda TW |
405 | file->private_data = &dev->iamthif_cl; |
406 | ||
407 | client = &data->out_client_properties; | |
d320832f TW |
408 | client->max_msg_length = me_cl->props.max_msg_length; |
409 | client->protocol_version = me_cl->props.protocol_version; | |
9f81abda TW |
410 | rets = dev->iamthif_cl.status; |
411 | ||
412 | goto end; | |
413 | } | |
414 | ||
9f81abda TW |
415 | /* prepare the output buffer */ |
416 | client = &data->out_client_properties; | |
d320832f TW |
417 | client->max_msg_length = me_cl->props.max_msg_length; |
418 | client->protocol_version = me_cl->props.protocol_version; | |
2bf94cab | 419 | dev_dbg(dev->dev, "Can connect?\n"); |
9f81abda | 420 | |
d49ed64a | 421 | rets = mei_cl_connect(cl, me_cl, file); |
9f81abda TW |
422 | |
423 | end: | |
79563db9 | 424 | mei_me_cl_put(me_cl); |
9f81abda TW |
425 | return rets; |
426 | } | |
427 | ||
3c7c8468 TW |
428 | /** |
429 | * mei_ioctl_client_notify_request - | |
430 | * propagate event notification request to client | |
431 | * | |
432 | * @file: pointer to file structure | |
433 | * @request: 0 - disable, 1 - enable | |
434 | * | |
435 | * Return: 0 on success , <0 on error | |
436 | */ | |
f23e2cc4 | 437 | static int mei_ioctl_client_notify_request(const struct file *file, u32 request) |
3c7c8468 TW |
438 | { |
439 | struct mei_cl *cl = file->private_data; | |
440 | ||
7326fffb AU |
441 | if (request != MEI_HBM_NOTIFICATION_START && |
442 | request != MEI_HBM_NOTIFICATION_STOP) | |
443 | return -EINVAL; | |
444 | ||
445 | return mei_cl_notify_request(cl, file, (u8)request); | |
3c7c8468 TW |
446 | } |
447 | ||
448 | /** | |
449 | * mei_ioctl_client_notify_get - wait for notification request | |
450 | * | |
451 | * @file: pointer to file structure | |
452 | * @notify_get: 0 - disable, 1 - enable | |
453 | * | |
454 | * Return: 0 on success , <0 on error | |
455 | */ | |
f23e2cc4 | 456 | static int mei_ioctl_client_notify_get(const struct file *file, u32 *notify_get) |
3c7c8468 TW |
457 | { |
458 | struct mei_cl *cl = file->private_data; | |
459 | bool notify_ev; | |
460 | bool block = (file->f_flags & O_NONBLOCK) == 0; | |
461 | int rets; | |
462 | ||
463 | rets = mei_cl_notify_get(cl, block, ¬ify_ev); | |
464 | if (rets) | |
465 | return rets; | |
466 | ||
467 | *notify_get = notify_ev ? 1 : 0; | |
468 | return 0; | |
469 | } | |
470 | ||
ab841160 OW |
471 | /** |
472 | * mei_ioctl - the IOCTL function | |
473 | * | |
474 | * @file: pointer to file structure | |
475 | * @cmd: ioctl command | |
476 | * @data: pointer to mei message structure | |
477 | * | |
a8605ea2 | 478 | * Return: 0 on success , <0 on error |
ab841160 OW |
479 | */ |
480 | static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data) | |
481 | { | |
482 | struct mei_device *dev; | |
483 | struct mei_cl *cl = file->private_data; | |
154eb18f | 484 | struct mei_connect_client_data connect_data; |
3c7c8468 | 485 | u32 notify_get, notify_req; |
ab841160 OW |
486 | int rets; |
487 | ||
ab841160 OW |
488 | |
489 | if (WARN_ON(!cl || !cl->dev)) | |
490 | return -ENODEV; | |
491 | ||
492 | dev = cl->dev; | |
493 | ||
2bf94cab | 494 | dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd); |
ab841160 OW |
495 | |
496 | mutex_lock(&dev->device_lock); | |
b210d750 | 497 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
498 | rets = -ENODEV; |
499 | goto out; | |
500 | } | |
501 | ||
4f046e7b TW |
502 | switch (cmd) { |
503 | case IOCTL_MEI_CONNECT_CLIENT: | |
2bf94cab | 504 | dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n"); |
154eb18f | 505 | if (copy_from_user(&connect_data, (char __user *)data, |
4f046e7b | 506 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 507 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
4f046e7b TW |
508 | rets = -EFAULT; |
509 | goto out; | |
510 | } | |
ab841160 | 511 | |
154eb18f | 512 | rets = mei_ioctl_connect_client(file, &connect_data); |
4f046e7b TW |
513 | if (rets) |
514 | goto out; | |
ab841160 | 515 | |
4f046e7b | 516 | /* if all is ok, copying the data back to user. */ |
154eb18f | 517 | if (copy_to_user((char __user *)data, &connect_data, |
ab841160 | 518 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 519 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
4f046e7b TW |
520 | rets = -EFAULT; |
521 | goto out; | |
522 | } | |
523 | ||
524 | break; | |
154eb18f | 525 | |
3c7c8468 TW |
526 | case IOCTL_MEI_NOTIFY_SET: |
527 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_SET.\n"); | |
528 | if (copy_from_user(¬ify_req, | |
529 | (char __user *)data, sizeof(notify_req))) { | |
530 | dev_dbg(dev->dev, "failed to copy data from userland\n"); | |
531 | rets = -EFAULT; | |
532 | goto out; | |
533 | } | |
534 | rets = mei_ioctl_client_notify_request(file, notify_req); | |
535 | break; | |
536 | ||
537 | case IOCTL_MEI_NOTIFY_GET: | |
538 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_GET.\n"); | |
539 | rets = mei_ioctl_client_notify_get(file, ¬ify_get); | |
540 | if (rets) | |
541 | goto out; | |
542 | ||
543 | dev_dbg(dev->dev, "copy connect data to user\n"); | |
544 | if (copy_to_user((char __user *)data, | |
545 | ¬ify_get, sizeof(notify_get))) { | |
546 | dev_dbg(dev->dev, "failed to copy data to userland\n"); | |
547 | rets = -EFAULT; | |
548 | goto out; | |
549 | ||
550 | } | |
551 | break; | |
552 | ||
4f046e7b | 553 | default: |
2bf94cab | 554 | dev_err(dev->dev, ": unsupported ioctl %d.\n", cmd); |
4f046e7b | 555 | rets = -ENOIOCTLCMD; |
ab841160 OW |
556 | } |
557 | ||
558 | out: | |
ab841160 OW |
559 | mutex_unlock(&dev->device_lock); |
560 | return rets; | |
561 | } | |
562 | ||
563 | /** | |
564 | * mei_compat_ioctl - the compat IOCTL function | |
565 | * | |
566 | * @file: pointer to file structure | |
567 | * @cmd: ioctl command | |
568 | * @data: pointer to mei message structure | |
569 | * | |
a8605ea2 | 570 | * Return: 0 on success , <0 on error |
ab841160 OW |
571 | */ |
572 | #ifdef CONFIG_COMPAT | |
573 | static long mei_compat_ioctl(struct file *file, | |
441ab50f | 574 | unsigned int cmd, unsigned long data) |
ab841160 OW |
575 | { |
576 | return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data)); | |
577 | } | |
578 | #endif | |
579 | ||
580 | ||
581 | /** | |
582 | * mei_poll - the poll function | |
583 | * | |
584 | * @file: pointer to file structure | |
585 | * @wait: pointer to poll_table structure | |
586 | * | |
a8605ea2 | 587 | * Return: poll mask |
ab841160 OW |
588 | */ |
589 | static unsigned int mei_poll(struct file *file, poll_table *wait) | |
590 | { | |
1d9013f0 | 591 | unsigned long req_events = poll_requested_events(wait); |
ab841160 OW |
592 | struct mei_cl *cl = file->private_data; |
593 | struct mei_device *dev; | |
594 | unsigned int mask = 0; | |
2c84c297 | 595 | bool notify_en; |
ab841160 OW |
596 | |
597 | if (WARN_ON(!cl || !cl->dev)) | |
b950ac1d | 598 | return POLLERR; |
ab841160 OW |
599 | |
600 | dev = cl->dev; | |
601 | ||
602 | mutex_lock(&dev->device_lock); | |
603 | ||
2c84c297 | 604 | notify_en = cl->notify_en && (req_events & POLLPRI); |
f3de9b63 TW |
605 | |
606 | if (dev->dev_state != MEI_DEV_ENABLED || | |
607 | !mei_cl_is_connected(cl)) { | |
b950ac1d | 608 | mask = POLLERR; |
ab841160 OW |
609 | goto out; |
610 | } | |
611 | ||
2c84c297 TW |
612 | if (notify_en) { |
613 | poll_wait(file, &cl->ev_wait, wait); | |
614 | if (cl->notify_ev) | |
615 | mask |= POLLPRI; | |
616 | } | |
9fa0be8b AU |
617 | |
618 | if (cl == &dev->iamthif_cl) { | |
619 | mask |= mei_amthif_poll(file, wait); | |
620 | goto out; | |
621 | } | |
2c84c297 | 622 | |
1d9013f0 TW |
623 | if (req_events & (POLLIN | POLLRDNORM)) { |
624 | poll_wait(file, &cl->rx_wait, wait); | |
625 | ||
626 | if (!list_empty(&cl->rd_completed)) | |
627 | mask |= POLLIN | POLLRDNORM; | |
628 | else | |
3030dc05 | 629 | mei_cl_read_start(cl, mei_cl_mtu(cl), file); |
1d9013f0 | 630 | } |
ab841160 OW |
631 | |
632 | out: | |
633 | mutex_unlock(&dev->device_lock); | |
634 | return mask; | |
635 | } | |
636 | ||
237092bf TW |
637 | /** |
638 | * mei_fasync - asynchronous io support | |
639 | * | |
640 | * @fd: file descriptor | |
641 | * @file: pointer to file structure | |
642 | * @band: band bitmap | |
643 | * | |
ed6dc538 TW |
644 | * Return: negative on error, |
645 | * 0 if it did no changes, | |
646 | * and positive a process was added or deleted | |
237092bf TW |
647 | */ |
648 | static int mei_fasync(int fd, struct file *file, int band) | |
649 | { | |
650 | ||
651 | struct mei_cl *cl = file->private_data; | |
652 | ||
653 | if (!mei_cl_is_connected(cl)) | |
ed6dc538 | 654 | return -ENODEV; |
237092bf TW |
655 | |
656 | return fasync_helper(fd, file, band, &cl->ev_async); | |
657 | } | |
658 | ||
55c4e640 | 659 | /** |
88d1bece | 660 | * fw_status_show - mei device fw_status attribute show method |
55c4e640 TW |
661 | * |
662 | * @device: device pointer | |
663 | * @attr: attribute pointer | |
664 | * @buf: char out buffer | |
665 | * | |
666 | * Return: number of the bytes printed into buf or error | |
667 | */ | |
668 | static ssize_t fw_status_show(struct device *device, | |
669 | struct device_attribute *attr, char *buf) | |
670 | { | |
671 | struct mei_device *dev = dev_get_drvdata(device); | |
672 | struct mei_fw_status fw_status; | |
673 | int err, i; | |
674 | ssize_t cnt = 0; | |
675 | ||
676 | mutex_lock(&dev->device_lock); | |
677 | err = mei_fw_status(dev, &fw_status); | |
678 | mutex_unlock(&dev->device_lock); | |
679 | if (err) { | |
680 | dev_err(device, "read fw_status error = %d\n", err); | |
681 | return err; | |
682 | } | |
683 | ||
684 | for (i = 0; i < fw_status.count; i++) | |
685 | cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n", | |
686 | fw_status.status[i]); | |
687 | return cnt; | |
688 | } | |
689 | static DEVICE_ATTR_RO(fw_status); | |
690 | ||
88d1bece AU |
691 | /** |
692 | * hbm_ver_show - display HBM protocol version negotiated with FW | |
693 | * | |
694 | * @device: device pointer | |
695 | * @attr: attribute pointer | |
696 | * @buf: char out buffer | |
697 | * | |
698 | * Return: number of the bytes printed into buf or error | |
699 | */ | |
700 | static ssize_t hbm_ver_show(struct device *device, | |
701 | struct device_attribute *attr, char *buf) | |
702 | { | |
703 | struct mei_device *dev = dev_get_drvdata(device); | |
704 | struct hbm_version ver; | |
705 | ||
706 | mutex_lock(&dev->device_lock); | |
707 | ver = dev->version; | |
708 | mutex_unlock(&dev->device_lock); | |
709 | ||
710 | return sprintf(buf, "%u.%u\n", ver.major_version, ver.minor_version); | |
711 | } | |
712 | static DEVICE_ATTR_RO(hbm_ver); | |
713 | ||
714 | /** | |
715 | * hbm_ver_drv_show - display HBM protocol version advertised by driver | |
716 | * | |
717 | * @device: device pointer | |
718 | * @attr: attribute pointer | |
719 | * @buf: char out buffer | |
720 | * | |
721 | * Return: number of the bytes printed into buf or error | |
722 | */ | |
723 | static ssize_t hbm_ver_drv_show(struct device *device, | |
724 | struct device_attribute *attr, char *buf) | |
725 | { | |
726 | return sprintf(buf, "%u.%u\n", HBM_MAJOR_VERSION, HBM_MINOR_VERSION); | |
727 | } | |
728 | static DEVICE_ATTR_RO(hbm_ver_drv); | |
729 | ||
55c4e640 TW |
730 | static struct attribute *mei_attrs[] = { |
731 | &dev_attr_fw_status.attr, | |
88d1bece AU |
732 | &dev_attr_hbm_ver.attr, |
733 | &dev_attr_hbm_ver_drv.attr, | |
55c4e640 TW |
734 | NULL |
735 | }; | |
736 | ATTRIBUTE_GROUPS(mei); | |
737 | ||
5b881e3c OW |
738 | /* |
739 | * file operations structure will be used for mei char device. | |
740 | */ | |
741 | static const struct file_operations mei_fops = { | |
742 | .owner = THIS_MODULE, | |
743 | .read = mei_read, | |
744 | .unlocked_ioctl = mei_ioctl, | |
745 | #ifdef CONFIG_COMPAT | |
746 | .compat_ioctl = mei_compat_ioctl, | |
747 | #endif | |
748 | .open = mei_open, | |
749 | .release = mei_release, | |
750 | .write = mei_write, | |
751 | .poll = mei_poll, | |
237092bf | 752 | .fasync = mei_fasync, |
5b881e3c OW |
753 | .llseek = no_llseek |
754 | }; | |
755 | ||
f3d8e878 AU |
756 | static struct class *mei_class; |
757 | static dev_t mei_devt; | |
758 | #define MEI_MAX_DEVS MINORMASK | |
759 | static DEFINE_MUTEX(mei_minor_lock); | |
760 | static DEFINE_IDR(mei_idr); | |
761 | ||
762 | /** | |
763 | * mei_minor_get - obtain next free device minor number | |
764 | * | |
765 | * @dev: device pointer | |
766 | * | |
a8605ea2 | 767 | * Return: allocated minor, or -ENOSPC if no free minor left |
5b881e3c | 768 | */ |
f3d8e878 AU |
769 | static int mei_minor_get(struct mei_device *dev) |
770 | { | |
771 | int ret; | |
772 | ||
773 | mutex_lock(&mei_minor_lock); | |
774 | ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL); | |
775 | if (ret >= 0) | |
776 | dev->minor = ret; | |
777 | else if (ret == -ENOSPC) | |
2bf94cab | 778 | dev_err(dev->dev, "too many mei devices\n"); |
5b881e3c | 779 | |
f3d8e878 AU |
780 | mutex_unlock(&mei_minor_lock); |
781 | return ret; | |
782 | } | |
30e53bb8 | 783 | |
f3d8e878 AU |
784 | /** |
785 | * mei_minor_free - mark device minor number as free | |
786 | * | |
787 | * @dev: device pointer | |
788 | */ | |
789 | static void mei_minor_free(struct mei_device *dev) | |
9a123f19 | 790 | { |
f3d8e878 AU |
791 | mutex_lock(&mei_minor_lock); |
792 | idr_remove(&mei_idr, dev->minor); | |
793 | mutex_unlock(&mei_minor_lock); | |
794 | } | |
795 | ||
796 | int mei_register(struct mei_device *dev, struct device *parent) | |
797 | { | |
798 | struct device *clsdev; /* class device */ | |
799 | int ret, devno; | |
800 | ||
801 | ret = mei_minor_get(dev); | |
802 | if (ret < 0) | |
30e53bb8 TW |
803 | return ret; |
804 | ||
f3d8e878 AU |
805 | /* Fill in the data structures */ |
806 | devno = MKDEV(MAJOR(mei_devt), dev->minor); | |
807 | cdev_init(&dev->cdev, &mei_fops); | |
154322f4 | 808 | dev->cdev.owner = parent->driver->owner; |
f3d8e878 AU |
809 | |
810 | /* Add the device */ | |
811 | ret = cdev_add(&dev->cdev, devno, 1); | |
812 | if (ret) { | |
813 | dev_err(parent, "unable to add device %d:%d\n", | |
814 | MAJOR(mei_devt), dev->minor); | |
815 | goto err_dev_add; | |
816 | } | |
817 | ||
55c4e640 TW |
818 | clsdev = device_create_with_groups(mei_class, parent, devno, |
819 | dev, mei_groups, | |
820 | "mei%d", dev->minor); | |
f3d8e878 AU |
821 | |
822 | if (IS_ERR(clsdev)) { | |
823 | dev_err(parent, "unable to create device %d:%d\n", | |
824 | MAJOR(mei_devt), dev->minor); | |
825 | ret = PTR_ERR(clsdev); | |
826 | goto err_dev_create; | |
827 | } | |
828 | ||
829 | ret = mei_dbgfs_register(dev, dev_name(clsdev)); | |
830 | if (ret) { | |
831 | dev_err(clsdev, "cannot register debugfs ret = %d\n", ret); | |
832 | goto err_dev_dbgfs; | |
833 | } | |
30e53bb8 TW |
834 | |
835 | return 0; | |
f3d8e878 AU |
836 | |
837 | err_dev_dbgfs: | |
838 | device_destroy(mei_class, devno); | |
839 | err_dev_create: | |
840 | cdev_del(&dev->cdev); | |
841 | err_dev_add: | |
842 | mei_minor_free(dev); | |
843 | return ret; | |
5b881e3c | 844 | } |
40e0b67b | 845 | EXPORT_SYMBOL_GPL(mei_register); |
5b881e3c | 846 | |
30e53bb8 | 847 | void mei_deregister(struct mei_device *dev) |
5b881e3c | 848 | { |
f3d8e878 AU |
849 | int devno; |
850 | ||
851 | devno = dev->cdev.dev; | |
852 | cdev_del(&dev->cdev); | |
853 | ||
30e53bb8 | 854 | mei_dbgfs_deregister(dev); |
f3d8e878 AU |
855 | |
856 | device_destroy(mei_class, devno); | |
857 | ||
858 | mei_minor_free(dev); | |
5b881e3c | 859 | } |
40e0b67b | 860 | EXPORT_SYMBOL_GPL(mei_deregister); |
ab841160 | 861 | |
cf3baefb SO |
862 | static int __init mei_init(void) |
863 | { | |
f3d8e878 AU |
864 | int ret; |
865 | ||
866 | mei_class = class_create(THIS_MODULE, "mei"); | |
867 | if (IS_ERR(mei_class)) { | |
868 | pr_err("couldn't create class\n"); | |
869 | ret = PTR_ERR(mei_class); | |
870 | goto err; | |
871 | } | |
872 | ||
873 | ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei"); | |
874 | if (ret < 0) { | |
875 | pr_err("unable to allocate char dev region\n"); | |
876 | goto err_class; | |
877 | } | |
878 | ||
879 | ret = mei_cl_bus_init(); | |
880 | if (ret < 0) { | |
881 | pr_err("unable to initialize bus\n"); | |
882 | goto err_chrdev; | |
883 | } | |
884 | ||
885 | return 0; | |
886 | ||
887 | err_chrdev: | |
888 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); | |
889 | err_class: | |
890 | class_destroy(mei_class); | |
891 | err: | |
892 | return ret; | |
cf3baefb SO |
893 | } |
894 | ||
895 | static void __exit mei_exit(void) | |
896 | { | |
f3d8e878 AU |
897 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); |
898 | class_destroy(mei_class); | |
cf3baefb SO |
899 | mei_cl_bus_exit(); |
900 | } | |
901 | ||
902 | module_init(mei_init); | |
903 | module_exit(mei_exit); | |
904 | ||
40e0b67b TW |
905 | MODULE_AUTHOR("Intel Corporation"); |
906 | MODULE_DESCRIPTION("Intel(R) Management Engine Interface"); | |
827eef51 | 907 | MODULE_LICENSE("GPL v2"); |
ab841160 | 908 |