Commit | Line | Data |
---|---|---|
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); | |
394a77d0 | 106 | |
3c666182 TW |
107 | rets = mei_cl_disconnect(cl); |
108 | ||
a9bed610 | 109 | mei_cl_flush_queues(cl, file); |
46922186 | 110 | cl_dbg(dev, cl, "removing\n"); |
a562d5c2 | 111 | |
90e0b5f1 | 112 | mei_cl_unlink(cl); |
a562d5c2 | 113 | |
a562d5c2 | 114 | file->private_data = NULL; |
ab841160 | 115 | |
a562d5c2 | 116 | kfree(cl); |
394a77d0 | 117 | |
ab841160 OW |
118 | mutex_unlock(&dev->device_lock); |
119 | return rets; | |
120 | } | |
121 | ||
122 | ||
123 | /** | |
124 | * mei_read - the read function. | |
125 | * | |
126 | * @file: pointer to file structure | |
127 | * @ubuf: pointer to user buffer | |
128 | * @length: buffer length | |
129 | * @offset: data offset in buffer | |
130 | * | |
a8605ea2 | 131 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
132 | */ |
133 | static ssize_t mei_read(struct file *file, char __user *ubuf, | |
441ab50f | 134 | size_t length, loff_t *offset) |
ab841160 OW |
135 | { |
136 | struct mei_cl *cl = file->private_data; | |
ab841160 | 137 | struct mei_device *dev; |
a9bed610 | 138 | struct mei_cl_cb *cb = NULL; |
ff1586a7 | 139 | bool nonblock = !!(file->f_flags & O_NONBLOCK); |
ab841160 | 140 | int rets; |
ab841160 OW |
141 | |
142 | if (WARN_ON(!cl || !cl->dev)) | |
143 | return -ENODEV; | |
144 | ||
145 | dev = cl->dev; | |
146 | ||
dd5de1f1 | 147 | |
ab841160 | 148 | mutex_lock(&dev->device_lock); |
b210d750 | 149 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
150 | rets = -ENODEV; |
151 | goto out; | |
152 | } | |
153 | ||
dd5de1f1 TW |
154 | if (length == 0) { |
155 | rets = 0; | |
156 | goto out; | |
157 | } | |
158 | ||
8b2458f4 AU |
159 | if (ubuf == NULL) { |
160 | rets = -EMSGSIZE; | |
161 | goto out; | |
162 | } | |
163 | ||
a9bed610 | 164 | cb = mei_cl_read_cb(cl, file); |
8b2458f4 AU |
165 | if (cb) |
166 | goto copy_buffer; | |
167 | ||
168 | if (*offset > 0) | |
ab841160 | 169 | *offset = 0; |
ab841160 | 170 | |
ff1586a7 AU |
171 | rets = mei_cl_read_start(cl, length, file); |
172 | if (rets && rets != -EBUSY) { | |
173 | cl_dbg(dev, cl, "mei start read failure status = %d\n", rets); | |
ab841160 OW |
174 | goto out; |
175 | } | |
176 | ||
ff1586a7 AU |
177 | if (nonblock) { |
178 | rets = -EAGAIN; | |
179 | goto out; | |
180 | } | |
181 | ||
cb97fbbc AU |
182 | mutex_unlock(&dev->device_lock); |
183 | if (wait_event_interruptible(cl->rx_wait, | |
184 | !list_empty(&cl->rd_completed) || | |
185 | !mei_cl_is_connected(cl))) { | |
186 | if (signal_pending(current)) | |
187 | return -EINTR; | |
188 | return -ERESTARTSYS; | |
189 | } | |
190 | mutex_lock(&dev->device_lock); | |
e2b31644 | 191 | |
cb97fbbc AU |
192 | if (!mei_cl_is_connected(cl)) { |
193 | rets = -ENODEV; | |
194 | goto out; | |
195 | } | |
ab841160 | 196 | |
cb97fbbc AU |
197 | cb = mei_cl_read_cb(cl, file); |
198 | if (!cb) { | |
cb97fbbc AU |
199 | rets = 0; |
200 | goto out; | |
201 | } | |
3d33ff24 | 202 | |
ab841160 | 203 | copy_buffer: |
3d33ff24 TW |
204 | /* now copy the data to user space */ |
205 | if (cb->status) { | |
206 | rets = cb->status; | |
292f82c8 | 207 | cl_dbg(dev, cl, "read operation failed %d\n", rets); |
3d33ff24 TW |
208 | goto free; |
209 | } | |
210 | ||
35bf7692 | 211 | cl_dbg(dev, cl, "buf.size = %zu buf.idx = %zu offset = %lld\n", |
8b2458f4 AU |
212 | cb->buf.size, cb->buf_idx, *offset); |
213 | if (*offset >= cb->buf_idx) { | |
214 | rets = 0; | |
ab841160 OW |
215 | goto free; |
216 | } | |
217 | ||
ebb108ef TW |
218 | /* length is being truncated to PAGE_SIZE, |
219 | * however buf_idx may point beyond that */ | |
220 | length = min_t(size_t, length, cb->buf_idx - *offset); | |
ab841160 | 221 | |
5db7514d | 222 | if (copy_to_user(ubuf, cb->buf.data + *offset, length)) { |
2bf94cab | 223 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
ab841160 OW |
224 | rets = -EFAULT; |
225 | goto free; | |
226 | } | |
227 | ||
228 | rets = length; | |
229 | *offset += length; | |
f862b6b2 TW |
230 | /* not all data was read, keep the cb */ |
231 | if (*offset < cb->buf_idx) | |
ab841160 OW |
232 | goto out; |
233 | ||
234 | free: | |
601a1efa | 235 | mei_io_cb_free(cb); |
8b2458f4 | 236 | *offset = 0; |
928fa666 | 237 | |
ab841160 | 238 | out: |
292f82c8 | 239 | cl_dbg(dev, cl, "end mei read rets = %d\n", rets); |
ab841160 OW |
240 | mutex_unlock(&dev->device_lock); |
241 | return rets; | |
242 | } | |
ab841160 OW |
243 | /** |
244 | * mei_write - the write function. | |
245 | * | |
246 | * @file: pointer to file structure | |
247 | * @ubuf: pointer to user buffer | |
248 | * @length: buffer length | |
249 | * @offset: data offset in buffer | |
250 | * | |
a8605ea2 | 251 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
252 | */ |
253 | static ssize_t mei_write(struct file *file, const char __user *ubuf, | |
441ab50f | 254 | size_t length, loff_t *offset) |
ab841160 OW |
255 | { |
256 | struct mei_cl *cl = file->private_data; | |
6cbb097f | 257 | struct mei_cl_cb *cb; |
ab841160 | 258 | struct mei_device *dev; |
ab841160 | 259 | int rets; |
ab841160 OW |
260 | |
261 | if (WARN_ON(!cl || !cl->dev)) | |
262 | return -ENODEV; | |
263 | ||
264 | dev = cl->dev; | |
265 | ||
266 | mutex_lock(&dev->device_lock); | |
267 | ||
b210d750 | 268 | if (dev->dev_state != MEI_DEV_ENABLED) { |
75f0ee15 | 269 | rets = -ENODEV; |
4234a6de | 270 | goto out; |
ab841160 OW |
271 | } |
272 | ||
d49ed64a AU |
273 | if (!mei_cl_is_connected(cl)) { |
274 | cl_err(dev, cl, "is not connected"); | |
275 | rets = -ENODEV; | |
4234a6de | 276 | goto out; |
75f0ee15 | 277 | } |
dd5de1f1 | 278 | |
d49ed64a AU |
279 | if (!mei_me_cl_is_active(cl->me_cl)) { |
280 | rets = -ENOTTY; | |
dd5de1f1 TW |
281 | goto out; |
282 | } | |
283 | ||
d49ed64a | 284 | if (length > mei_cl_mtu(cl)) { |
dd5de1f1 | 285 | rets = -EFBIG; |
4234a6de | 286 | goto out; |
75f0ee15 TW |
287 | } |
288 | ||
d49ed64a AU |
289 | if (length == 0) { |
290 | rets = 0; | |
4234a6de | 291 | goto out; |
75f0ee15 | 292 | } |
d49ed64a | 293 | |
a9bed610 | 294 | *offset = 0; |
6cbb097f AU |
295 | cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file); |
296 | if (!cb) { | |
33d28c92 | 297 | rets = -ENOMEM; |
4234a6de | 298 | goto out; |
ab841160 | 299 | } |
ab841160 | 300 | |
6cbb097f | 301 | rets = copy_from_user(cb->buf.data, ubuf, length); |
d8b29efa | 302 | if (rets) { |
2bf94cab | 303 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
d8b29efa | 304 | rets = -EFAULT; |
6cbb097f | 305 | mei_io_cb_free(cb); |
4234a6de | 306 | goto out; |
d8b29efa | 307 | } |
ab841160 | 308 | |
e0cb6b2f | 309 | rets = mei_cl_write(cl, cb); |
b0d0cf77 | 310 | out: |
ab841160 | 311 | mutex_unlock(&dev->device_lock); |
ab841160 OW |
312 | return rets; |
313 | } | |
314 | ||
9f81abda TW |
315 | /** |
316 | * mei_ioctl_connect_client - the connect to fw client IOCTL function | |
317 | * | |
9f81abda | 318 | * @file: private data of the file object |
a8605ea2 | 319 | * @data: IOCTL connect data, input and output parameters |
9f81abda TW |
320 | * |
321 | * Locking: called under "dev->device_lock" lock | |
322 | * | |
a8605ea2 | 323 | * Return: 0 on success, <0 on failure. |
9f81abda TW |
324 | */ |
325 | static int mei_ioctl_connect_client(struct file *file, | |
326 | struct mei_connect_client_data *data) | |
327 | { | |
328 | struct mei_device *dev; | |
329 | struct mei_client *client; | |
d320832f | 330 | struct mei_me_client *me_cl; |
9f81abda | 331 | struct mei_cl *cl; |
9f81abda TW |
332 | int rets; |
333 | ||
334 | cl = file->private_data; | |
9f81abda TW |
335 | dev = cl->dev; |
336 | ||
79563db9 TW |
337 | if (dev->dev_state != MEI_DEV_ENABLED) |
338 | return -ENODEV; | |
9f81abda TW |
339 | |
340 | if (cl->state != MEI_FILE_INITIALIZING && | |
79563db9 TW |
341 | cl->state != MEI_FILE_DISCONNECTED) |
342 | return -EBUSY; | |
9f81abda TW |
343 | |
344 | /* find ME client we're trying to connect to */ | |
d320832f | 345 | me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid); |
f4e06246 | 346 | if (!me_cl) { |
2bf94cab | 347 | dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n", |
d49ed64a | 348 | &data->in_client_uuid); |
f4e06246 AU |
349 | rets = -ENOTTY; |
350 | goto end; | |
351 | } | |
352 | ||
353 | if (me_cl->props.fixed_address) { | |
354 | bool forbidden = dev->override_fixed_address ? | |
355 | !dev->allow_fixed_address : !dev->hbm_f_fa_supported; | |
356 | if (forbidden) { | |
357 | dev_dbg(dev->dev, "Connection forbidden to FW Client UUID = %pUl\n", | |
358 | &data->in_client_uuid); | |
359 | rets = -ENOTTY; | |
360 | goto end; | |
361 | } | |
9f81abda TW |
362 | } |
363 | ||
2bf94cab | 364 | dev_dbg(dev->dev, "Connect to FW Client ID = %d\n", |
d49ed64a | 365 | me_cl->client_id); |
2bf94cab | 366 | dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n", |
d320832f | 367 | me_cl->props.protocol_version); |
2bf94cab | 368 | dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n", |
d320832f | 369 | me_cl->props.max_msg_length); |
9f81abda | 370 | |
9f81abda TW |
371 | /* prepare the output buffer */ |
372 | client = &data->out_client_properties; | |
d320832f TW |
373 | client->max_msg_length = me_cl->props.max_msg_length; |
374 | client->protocol_version = me_cl->props.protocol_version; | |
2bf94cab | 375 | dev_dbg(dev->dev, "Can connect?\n"); |
9f81abda | 376 | |
d49ed64a | 377 | rets = mei_cl_connect(cl, me_cl, file); |
9f81abda TW |
378 | |
379 | end: | |
79563db9 | 380 | mei_me_cl_put(me_cl); |
9f81abda TW |
381 | return rets; |
382 | } | |
383 | ||
3c7c8468 TW |
384 | /** |
385 | * mei_ioctl_client_notify_request - | |
386 | * propagate event notification request to client | |
387 | * | |
388 | * @file: pointer to file structure | |
389 | * @request: 0 - disable, 1 - enable | |
390 | * | |
391 | * Return: 0 on success , <0 on error | |
392 | */ | |
f23e2cc4 | 393 | static int mei_ioctl_client_notify_request(const struct file *file, u32 request) |
3c7c8468 TW |
394 | { |
395 | struct mei_cl *cl = file->private_data; | |
396 | ||
7326fffb AU |
397 | if (request != MEI_HBM_NOTIFICATION_START && |
398 | request != MEI_HBM_NOTIFICATION_STOP) | |
399 | return -EINVAL; | |
400 | ||
401 | return mei_cl_notify_request(cl, file, (u8)request); | |
3c7c8468 TW |
402 | } |
403 | ||
404 | /** | |
405 | * mei_ioctl_client_notify_get - wait for notification request | |
406 | * | |
407 | * @file: pointer to file structure | |
408 | * @notify_get: 0 - disable, 1 - enable | |
409 | * | |
410 | * Return: 0 on success , <0 on error | |
411 | */ | |
f23e2cc4 | 412 | static int mei_ioctl_client_notify_get(const struct file *file, u32 *notify_get) |
3c7c8468 TW |
413 | { |
414 | struct mei_cl *cl = file->private_data; | |
415 | bool notify_ev; | |
416 | bool block = (file->f_flags & O_NONBLOCK) == 0; | |
417 | int rets; | |
418 | ||
419 | rets = mei_cl_notify_get(cl, block, ¬ify_ev); | |
420 | if (rets) | |
421 | return rets; | |
422 | ||
423 | *notify_get = notify_ev ? 1 : 0; | |
424 | return 0; | |
425 | } | |
426 | ||
ab841160 OW |
427 | /** |
428 | * mei_ioctl - the IOCTL function | |
429 | * | |
430 | * @file: pointer to file structure | |
431 | * @cmd: ioctl command | |
432 | * @data: pointer to mei message structure | |
433 | * | |
a8605ea2 | 434 | * Return: 0 on success , <0 on error |
ab841160 OW |
435 | */ |
436 | static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data) | |
437 | { | |
438 | struct mei_device *dev; | |
439 | struct mei_cl *cl = file->private_data; | |
154eb18f | 440 | struct mei_connect_client_data connect_data; |
3c7c8468 | 441 | u32 notify_get, notify_req; |
ab841160 OW |
442 | int rets; |
443 | ||
ab841160 OW |
444 | |
445 | if (WARN_ON(!cl || !cl->dev)) | |
446 | return -ENODEV; | |
447 | ||
448 | dev = cl->dev; | |
449 | ||
2bf94cab | 450 | dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd); |
ab841160 OW |
451 | |
452 | mutex_lock(&dev->device_lock); | |
b210d750 | 453 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
454 | rets = -ENODEV; |
455 | goto out; | |
456 | } | |
457 | ||
4f046e7b TW |
458 | switch (cmd) { |
459 | case IOCTL_MEI_CONNECT_CLIENT: | |
2bf94cab | 460 | dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n"); |
154eb18f | 461 | if (copy_from_user(&connect_data, (char __user *)data, |
4f046e7b | 462 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 463 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
4f046e7b TW |
464 | rets = -EFAULT; |
465 | goto out; | |
466 | } | |
ab841160 | 467 | |
154eb18f | 468 | rets = mei_ioctl_connect_client(file, &connect_data); |
4f046e7b TW |
469 | if (rets) |
470 | goto out; | |
ab841160 | 471 | |
4f046e7b | 472 | /* if all is ok, copying the data back to user. */ |
154eb18f | 473 | if (copy_to_user((char __user *)data, &connect_data, |
ab841160 | 474 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 475 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
4f046e7b TW |
476 | rets = -EFAULT; |
477 | goto out; | |
478 | } | |
479 | ||
480 | break; | |
154eb18f | 481 | |
3c7c8468 TW |
482 | case IOCTL_MEI_NOTIFY_SET: |
483 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_SET.\n"); | |
484 | if (copy_from_user(¬ify_req, | |
485 | (char __user *)data, sizeof(notify_req))) { | |
486 | dev_dbg(dev->dev, "failed to copy data from userland\n"); | |
487 | rets = -EFAULT; | |
488 | goto out; | |
489 | } | |
490 | rets = mei_ioctl_client_notify_request(file, notify_req); | |
491 | break; | |
492 | ||
493 | case IOCTL_MEI_NOTIFY_GET: | |
494 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_GET.\n"); | |
495 | rets = mei_ioctl_client_notify_get(file, ¬ify_get); | |
496 | if (rets) | |
497 | goto out; | |
498 | ||
499 | dev_dbg(dev->dev, "copy connect data to user\n"); | |
500 | if (copy_to_user((char __user *)data, | |
501 | ¬ify_get, sizeof(notify_get))) { | |
502 | dev_dbg(dev->dev, "failed to copy data to userland\n"); | |
503 | rets = -EFAULT; | |
504 | goto out; | |
505 | ||
506 | } | |
507 | break; | |
508 | ||
4f046e7b | 509 | default: |
2bf94cab | 510 | dev_err(dev->dev, ": unsupported ioctl %d.\n", cmd); |
4f046e7b | 511 | rets = -ENOIOCTLCMD; |
ab841160 OW |
512 | } |
513 | ||
514 | out: | |
ab841160 OW |
515 | mutex_unlock(&dev->device_lock); |
516 | return rets; | |
517 | } | |
518 | ||
519 | /** | |
520 | * mei_compat_ioctl - the compat IOCTL function | |
521 | * | |
522 | * @file: pointer to file structure | |
523 | * @cmd: ioctl command | |
524 | * @data: pointer to mei message structure | |
525 | * | |
a8605ea2 | 526 | * Return: 0 on success , <0 on error |
ab841160 OW |
527 | */ |
528 | #ifdef CONFIG_COMPAT | |
529 | static long mei_compat_ioctl(struct file *file, | |
441ab50f | 530 | unsigned int cmd, unsigned long data) |
ab841160 OW |
531 | { |
532 | return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data)); | |
533 | } | |
534 | #endif | |
535 | ||
536 | ||
537 | /** | |
538 | * mei_poll - the poll function | |
539 | * | |
540 | * @file: pointer to file structure | |
541 | * @wait: pointer to poll_table structure | |
542 | * | |
a8605ea2 | 543 | * Return: poll mask |
ab841160 OW |
544 | */ |
545 | static unsigned int mei_poll(struct file *file, poll_table *wait) | |
546 | { | |
1d9013f0 | 547 | unsigned long req_events = poll_requested_events(wait); |
ab841160 OW |
548 | struct mei_cl *cl = file->private_data; |
549 | struct mei_device *dev; | |
550 | unsigned int mask = 0; | |
2c84c297 | 551 | bool notify_en; |
ab841160 OW |
552 | |
553 | if (WARN_ON(!cl || !cl->dev)) | |
b950ac1d | 554 | return POLLERR; |
ab841160 OW |
555 | |
556 | dev = cl->dev; | |
557 | ||
558 | mutex_lock(&dev->device_lock); | |
559 | ||
2c84c297 | 560 | notify_en = cl->notify_en && (req_events & POLLPRI); |
f3de9b63 TW |
561 | |
562 | if (dev->dev_state != MEI_DEV_ENABLED || | |
563 | !mei_cl_is_connected(cl)) { | |
b950ac1d | 564 | mask = POLLERR; |
ab841160 OW |
565 | goto out; |
566 | } | |
567 | ||
2c84c297 TW |
568 | if (notify_en) { |
569 | poll_wait(file, &cl->ev_wait, wait); | |
570 | if (cl->notify_ev) | |
571 | mask |= POLLPRI; | |
572 | } | |
9fa0be8b | 573 | |
1d9013f0 TW |
574 | if (req_events & (POLLIN | POLLRDNORM)) { |
575 | poll_wait(file, &cl->rx_wait, wait); | |
576 | ||
577 | if (!list_empty(&cl->rd_completed)) | |
578 | mask |= POLLIN | POLLRDNORM; | |
579 | else | |
3030dc05 | 580 | mei_cl_read_start(cl, mei_cl_mtu(cl), file); |
1d9013f0 | 581 | } |
ab841160 OW |
582 | |
583 | out: | |
584 | mutex_unlock(&dev->device_lock); | |
585 | return mask; | |
586 | } | |
587 | ||
58cde1a6 AU |
588 | /** |
589 | * mei_cl_is_write_queued - check if the client has pending writes. | |
590 | * | |
591 | * @cl: writing host client | |
592 | * | |
593 | * Return: true if client is writing, false otherwise. | |
594 | */ | |
595 | static bool mei_cl_is_write_queued(struct mei_cl *cl) | |
596 | { | |
597 | struct mei_device *dev = cl->dev; | |
598 | struct mei_cl_cb *cb; | |
599 | ||
600 | list_for_each_entry(cb, &dev->write_list, list) | |
601 | if (cb->cl == cl) | |
602 | return true; | |
603 | list_for_each_entry(cb, &dev->write_waiting_list, list) | |
604 | if (cb->cl == cl) | |
605 | return true; | |
606 | return false; | |
607 | } | |
608 | ||
609 | /** | |
610 | * mei_fsync - the fsync handler | |
611 | * | |
612 | * @fp: pointer to file structure | |
613 | * @start: unused | |
614 | * @end: unused | |
615 | * @datasync: unused | |
616 | * | |
617 | * Return: 0 on success, -ENODEV if client is not connected | |
618 | */ | |
619 | static int mei_fsync(struct file *fp, loff_t start, loff_t end, int datasync) | |
620 | { | |
621 | struct mei_cl *cl = fp->private_data; | |
622 | struct mei_device *dev; | |
623 | int rets; | |
624 | ||
625 | if (WARN_ON(!cl || !cl->dev)) | |
626 | return -ENODEV; | |
627 | ||
628 | dev = cl->dev; | |
629 | ||
630 | mutex_lock(&dev->device_lock); | |
631 | ||
632 | if (dev->dev_state != MEI_DEV_ENABLED || !mei_cl_is_connected(cl)) { | |
633 | rets = -ENODEV; | |
634 | goto out; | |
635 | } | |
636 | ||
637 | while (mei_cl_is_write_queued(cl)) { | |
638 | mutex_unlock(&dev->device_lock); | |
639 | rets = wait_event_interruptible(cl->tx_wait, | |
640 | cl->writing_state == MEI_WRITE_COMPLETE || | |
641 | !mei_cl_is_connected(cl)); | |
642 | mutex_lock(&dev->device_lock); | |
643 | if (rets) { | |
644 | if (signal_pending(current)) | |
645 | rets = -EINTR; | |
646 | goto out; | |
647 | } | |
648 | if (!mei_cl_is_connected(cl)) { | |
649 | rets = -ENODEV; | |
650 | goto out; | |
651 | } | |
652 | } | |
653 | rets = 0; | |
654 | out: | |
655 | mutex_unlock(&dev->device_lock); | |
656 | return rets; | |
657 | } | |
658 | ||
237092bf TW |
659 | /** |
660 | * mei_fasync - asynchronous io support | |
661 | * | |
662 | * @fd: file descriptor | |
663 | * @file: pointer to file structure | |
664 | * @band: band bitmap | |
665 | * | |
ed6dc538 TW |
666 | * Return: negative on error, |
667 | * 0 if it did no changes, | |
668 | * and positive a process was added or deleted | |
237092bf TW |
669 | */ |
670 | static int mei_fasync(int fd, struct file *file, int band) | |
671 | { | |
672 | ||
673 | struct mei_cl *cl = file->private_data; | |
674 | ||
675 | if (!mei_cl_is_connected(cl)) | |
ed6dc538 | 676 | return -ENODEV; |
237092bf TW |
677 | |
678 | return fasync_helper(fd, file, band, &cl->ev_async); | |
679 | } | |
680 | ||
55c4e640 | 681 | /** |
88d1bece | 682 | * fw_status_show - mei device fw_status attribute show method |
55c4e640 TW |
683 | * |
684 | * @device: device pointer | |
685 | * @attr: attribute pointer | |
686 | * @buf: char out buffer | |
687 | * | |
688 | * Return: number of the bytes printed into buf or error | |
689 | */ | |
690 | static ssize_t fw_status_show(struct device *device, | |
691 | struct device_attribute *attr, char *buf) | |
692 | { | |
693 | struct mei_device *dev = dev_get_drvdata(device); | |
694 | struct mei_fw_status fw_status; | |
695 | int err, i; | |
696 | ssize_t cnt = 0; | |
697 | ||
698 | mutex_lock(&dev->device_lock); | |
699 | err = mei_fw_status(dev, &fw_status); | |
700 | mutex_unlock(&dev->device_lock); | |
701 | if (err) { | |
702 | dev_err(device, "read fw_status error = %d\n", err); | |
703 | return err; | |
704 | } | |
705 | ||
706 | for (i = 0; i < fw_status.count; i++) | |
707 | cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n", | |
708 | fw_status.status[i]); | |
709 | return cnt; | |
710 | } | |
711 | static DEVICE_ATTR_RO(fw_status); | |
712 | ||
88d1bece AU |
713 | /** |
714 | * hbm_ver_show - display HBM protocol version negotiated with FW | |
715 | * | |
716 | * @device: device pointer | |
717 | * @attr: attribute pointer | |
718 | * @buf: char out buffer | |
719 | * | |
720 | * Return: number of the bytes printed into buf or error | |
721 | */ | |
722 | static ssize_t hbm_ver_show(struct device *device, | |
723 | struct device_attribute *attr, char *buf) | |
724 | { | |
725 | struct mei_device *dev = dev_get_drvdata(device); | |
726 | struct hbm_version ver; | |
727 | ||
728 | mutex_lock(&dev->device_lock); | |
729 | ver = dev->version; | |
730 | mutex_unlock(&dev->device_lock); | |
731 | ||
732 | return sprintf(buf, "%u.%u\n", ver.major_version, ver.minor_version); | |
733 | } | |
734 | static DEVICE_ATTR_RO(hbm_ver); | |
735 | ||
736 | /** | |
737 | * hbm_ver_drv_show - display HBM protocol version advertised by driver | |
738 | * | |
739 | * @device: device pointer | |
740 | * @attr: attribute pointer | |
741 | * @buf: char out buffer | |
742 | * | |
743 | * Return: number of the bytes printed into buf or error | |
744 | */ | |
745 | static ssize_t hbm_ver_drv_show(struct device *device, | |
746 | struct device_attribute *attr, char *buf) | |
747 | { | |
748 | return sprintf(buf, "%u.%u\n", HBM_MAJOR_VERSION, HBM_MINOR_VERSION); | |
749 | } | |
750 | static DEVICE_ATTR_RO(hbm_ver_drv); | |
751 | ||
55c4e640 TW |
752 | static struct attribute *mei_attrs[] = { |
753 | &dev_attr_fw_status.attr, | |
88d1bece AU |
754 | &dev_attr_hbm_ver.attr, |
755 | &dev_attr_hbm_ver_drv.attr, | |
55c4e640 TW |
756 | NULL |
757 | }; | |
758 | ATTRIBUTE_GROUPS(mei); | |
759 | ||
5b881e3c OW |
760 | /* |
761 | * file operations structure will be used for mei char device. | |
762 | */ | |
763 | static const struct file_operations mei_fops = { | |
764 | .owner = THIS_MODULE, | |
765 | .read = mei_read, | |
766 | .unlocked_ioctl = mei_ioctl, | |
767 | #ifdef CONFIG_COMPAT | |
768 | .compat_ioctl = mei_compat_ioctl, | |
769 | #endif | |
770 | .open = mei_open, | |
771 | .release = mei_release, | |
772 | .write = mei_write, | |
773 | .poll = mei_poll, | |
58cde1a6 | 774 | .fsync = mei_fsync, |
237092bf | 775 | .fasync = mei_fasync, |
5b881e3c OW |
776 | .llseek = no_llseek |
777 | }; | |
778 | ||
f3d8e878 AU |
779 | static struct class *mei_class; |
780 | static dev_t mei_devt; | |
781 | #define MEI_MAX_DEVS MINORMASK | |
782 | static DEFINE_MUTEX(mei_minor_lock); | |
783 | static DEFINE_IDR(mei_idr); | |
784 | ||
785 | /** | |
786 | * mei_minor_get - obtain next free device minor number | |
787 | * | |
788 | * @dev: device pointer | |
789 | * | |
a8605ea2 | 790 | * Return: allocated minor, or -ENOSPC if no free minor left |
5b881e3c | 791 | */ |
f3d8e878 AU |
792 | static int mei_minor_get(struct mei_device *dev) |
793 | { | |
794 | int ret; | |
795 | ||
796 | mutex_lock(&mei_minor_lock); | |
797 | ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL); | |
798 | if (ret >= 0) | |
799 | dev->minor = ret; | |
800 | else if (ret == -ENOSPC) | |
2bf94cab | 801 | dev_err(dev->dev, "too many mei devices\n"); |
5b881e3c | 802 | |
f3d8e878 AU |
803 | mutex_unlock(&mei_minor_lock); |
804 | return ret; | |
805 | } | |
30e53bb8 | 806 | |
f3d8e878 AU |
807 | /** |
808 | * mei_minor_free - mark device minor number as free | |
809 | * | |
810 | * @dev: device pointer | |
811 | */ | |
812 | static void mei_minor_free(struct mei_device *dev) | |
9a123f19 | 813 | { |
f3d8e878 AU |
814 | mutex_lock(&mei_minor_lock); |
815 | idr_remove(&mei_idr, dev->minor); | |
816 | mutex_unlock(&mei_minor_lock); | |
817 | } | |
818 | ||
819 | int mei_register(struct mei_device *dev, struct device *parent) | |
820 | { | |
821 | struct device *clsdev; /* class device */ | |
822 | int ret, devno; | |
823 | ||
824 | ret = mei_minor_get(dev); | |
825 | if (ret < 0) | |
30e53bb8 TW |
826 | return ret; |
827 | ||
f3d8e878 AU |
828 | /* Fill in the data structures */ |
829 | devno = MKDEV(MAJOR(mei_devt), dev->minor); | |
830 | cdev_init(&dev->cdev, &mei_fops); | |
154322f4 | 831 | dev->cdev.owner = parent->driver->owner; |
f3d8e878 AU |
832 | |
833 | /* Add the device */ | |
834 | ret = cdev_add(&dev->cdev, devno, 1); | |
835 | if (ret) { | |
836 | dev_err(parent, "unable to add device %d:%d\n", | |
837 | MAJOR(mei_devt), dev->minor); | |
838 | goto err_dev_add; | |
839 | } | |
840 | ||
55c4e640 TW |
841 | clsdev = device_create_with_groups(mei_class, parent, devno, |
842 | dev, mei_groups, | |
843 | "mei%d", dev->minor); | |
f3d8e878 AU |
844 | |
845 | if (IS_ERR(clsdev)) { | |
846 | dev_err(parent, "unable to create device %d:%d\n", | |
847 | MAJOR(mei_devt), dev->minor); | |
848 | ret = PTR_ERR(clsdev); | |
849 | goto err_dev_create; | |
850 | } | |
851 | ||
852 | ret = mei_dbgfs_register(dev, dev_name(clsdev)); | |
853 | if (ret) { | |
854 | dev_err(clsdev, "cannot register debugfs ret = %d\n", ret); | |
855 | goto err_dev_dbgfs; | |
856 | } | |
30e53bb8 TW |
857 | |
858 | return 0; | |
f3d8e878 AU |
859 | |
860 | err_dev_dbgfs: | |
861 | device_destroy(mei_class, devno); | |
862 | err_dev_create: | |
863 | cdev_del(&dev->cdev); | |
864 | err_dev_add: | |
865 | mei_minor_free(dev); | |
866 | return ret; | |
5b881e3c | 867 | } |
40e0b67b | 868 | EXPORT_SYMBOL_GPL(mei_register); |
5b881e3c | 869 | |
30e53bb8 | 870 | void mei_deregister(struct mei_device *dev) |
5b881e3c | 871 | { |
f3d8e878 AU |
872 | int devno; |
873 | ||
874 | devno = dev->cdev.dev; | |
875 | cdev_del(&dev->cdev); | |
876 | ||
30e53bb8 | 877 | mei_dbgfs_deregister(dev); |
f3d8e878 AU |
878 | |
879 | device_destroy(mei_class, devno); | |
880 | ||
881 | mei_minor_free(dev); | |
5b881e3c | 882 | } |
40e0b67b | 883 | EXPORT_SYMBOL_GPL(mei_deregister); |
ab841160 | 884 | |
cf3baefb SO |
885 | static int __init mei_init(void) |
886 | { | |
f3d8e878 AU |
887 | int ret; |
888 | ||
889 | mei_class = class_create(THIS_MODULE, "mei"); | |
890 | if (IS_ERR(mei_class)) { | |
891 | pr_err("couldn't create class\n"); | |
892 | ret = PTR_ERR(mei_class); | |
893 | goto err; | |
894 | } | |
895 | ||
896 | ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei"); | |
897 | if (ret < 0) { | |
898 | pr_err("unable to allocate char dev region\n"); | |
899 | goto err_class; | |
900 | } | |
901 | ||
902 | ret = mei_cl_bus_init(); | |
903 | if (ret < 0) { | |
904 | pr_err("unable to initialize bus\n"); | |
905 | goto err_chrdev; | |
906 | } | |
907 | ||
908 | return 0; | |
909 | ||
910 | err_chrdev: | |
911 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); | |
912 | err_class: | |
913 | class_destroy(mei_class); | |
914 | err: | |
915 | return ret; | |
cf3baefb SO |
916 | } |
917 | ||
918 | static void __exit mei_exit(void) | |
919 | { | |
f3d8e878 AU |
920 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); |
921 | class_destroy(mei_class); | |
cf3baefb SO |
922 | mei_cl_bus_exit(); |
923 | } | |
924 | ||
925 | module_init(mei_init); | |
926 | module_exit(mei_exit); | |
927 | ||
40e0b67b TW |
928 | MODULE_AUTHOR("Intel Corporation"); |
929 | MODULE_DESCRIPTION("Intel(R) Management Engine Interface"); | |
827eef51 | 930 | MODULE_LICENSE("GPL v2"); |
ab841160 | 931 |