Commit | Line | Data |
---|---|---|
9fff0425 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ab841160 | 2 | /* |
95953618 | 3 | * Copyright (c) 2003-2022, Intel Corporation. All rights reserved. |
ab841160 | 4 | * Intel Management Engine Interface (Intel MEI) Linux driver |
ab841160 | 5 | */ |
9fff0425 | 6 | |
ab841160 OW |
7 | #include <linux/module.h> |
8 | #include <linux/moduleparam.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/device.h> | |
1f180359 | 11 | #include <linux/slab.h> |
ab841160 OW |
12 | #include <linux/fs.h> |
13 | #include <linux/errno.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/fcntl.h> | |
ab841160 OW |
16 | #include <linux/poll.h> |
17 | #include <linux/init.h> | |
18 | #include <linux/ioctl.h> | |
19 | #include <linux/cdev.h> | |
174cd4b1 | 20 | #include <linux/sched/signal.h> |
ab841160 OW |
21 | #include <linux/uuid.h> |
22 | #include <linux/compat.h> | |
23 | #include <linux/jiffies.h> | |
24 | #include <linux/interrupt.h> | |
25 | ||
4f3afe1d | 26 | #include <linux/mei.h> |
47a73801 TW |
27 | |
28 | #include "mei_dev.h" | |
90e0b5f1 | 29 | #include "client.h" |
ab841160 | 30 | |
43b8a7ed AU |
31 | static struct class *mei_class; |
32 | static dev_t mei_devt; | |
33 | #define MEI_MAX_DEVS MINORMASK | |
34 | static DEFINE_MUTEX(mei_minor_lock); | |
35 | static DEFINE_IDR(mei_idr); | |
36 | ||
ab841160 OW |
37 | /** |
38 | * mei_open - the open function | |
39 | * | |
40 | * @inode: pointer to inode structure | |
41 | * @file: pointer to file structure | |
83ce0741 | 42 | * |
a8605ea2 | 43 | * Return: 0 on success, <0 on error |
ab841160 OW |
44 | */ |
45 | static int mei_open(struct inode *inode, struct file *file) | |
46 | { | |
ab841160 | 47 | struct mei_device *dev; |
f3d8e878 | 48 | struct mei_cl *cl; |
2703d4b2 | 49 | |
6f37aca8 | 50 | int err; |
ab841160 | 51 | |
f3d8e878 | 52 | dev = container_of(inode->i_cdev, struct mei_device, cdev); |
ab841160 OW |
53 | |
54 | mutex_lock(&dev->device_lock); | |
e036cc57 | 55 | |
b210d750 | 56 | if (dev->dev_state != MEI_DEV_ENABLED) { |
2bf94cab | 57 | dev_dbg(dev->dev, "dev_state != MEI_ENABLED dev_state = %s\n", |
b210d750 | 58 | mei_dev_state_str(dev->dev_state)); |
03b8d341 | 59 | err = -ENODEV; |
e036cc57 | 60 | goto err_unlock; |
1b812947 | 61 | } |
ab841160 | 62 | |
7851e008 | 63 | cl = mei_cl_alloc_linked(dev); |
03b8d341 TW |
64 | if (IS_ERR(cl)) { |
65 | err = PTR_ERR(cl); | |
e036cc57 | 66 | goto err_unlock; |
03b8d341 | 67 | } |
ab841160 | 68 | |
97d549b4 | 69 | cl->fp = file; |
ab841160 | 70 | file->private_data = cl; |
e036cc57 | 71 | |
ab841160 OW |
72 | mutex_unlock(&dev->device_lock); |
73 | ||
5b881e3c | 74 | return nonseekable_open(inode, file); |
ab841160 | 75 | |
e036cc57 | 76 | err_unlock: |
ab841160 | 77 | mutex_unlock(&dev->device_lock); |
ab841160 OW |
78 | return err; |
79 | } | |
80 | ||
f35fe5f4 AU |
81 | /** |
82 | * mei_cl_vtag_remove_by_fp - remove vtag that corresponds to fp from list | |
83 | * | |
84 | * @cl: host client | |
85 | * @fp: pointer to file structure | |
86 | * | |
87 | */ | |
88 | static void mei_cl_vtag_remove_by_fp(const struct mei_cl *cl, | |
89 | const struct file *fp) | |
90 | { | |
91 | struct mei_cl_vtag *vtag_l, *next; | |
92 | ||
93 | list_for_each_entry_safe(vtag_l, next, &cl->vtag_map, list) { | |
94 | if (vtag_l->fp == fp) { | |
95 | list_del(&vtag_l->list); | |
96 | kfree(vtag_l); | |
97 | return; | |
98 | } | |
99 | } | |
100 | } | |
101 | ||
ab841160 OW |
102 | /** |
103 | * mei_release - the release function | |
104 | * | |
105 | * @inode: pointer to inode structure | |
106 | * @file: pointer to file structure | |
107 | * | |
a8605ea2 | 108 | * Return: 0 on success, <0 on error |
ab841160 OW |
109 | */ |
110 | static int mei_release(struct inode *inode, struct file *file) | |
111 | { | |
112 | struct mei_cl *cl = file->private_data; | |
ab841160 | 113 | struct mei_device *dev; |
3c666182 | 114 | int rets; |
ab841160 OW |
115 | |
116 | if (WARN_ON(!cl || !cl->dev)) | |
117 | return -ENODEV; | |
118 | ||
119 | dev = cl->dev; | |
120 | ||
121 | mutex_lock(&dev->device_lock); | |
394a77d0 | 122 | |
f35fe5f4 AU |
123 | mei_cl_vtag_remove_by_fp(cl, file); |
124 | ||
125 | if (!list_empty(&cl->vtag_map)) { | |
126 | cl_dbg(dev, cl, "not the last vtag\n"); | |
127 | mei_cl_flush_queues(cl, file); | |
128 | rets = 0; | |
129 | goto out; | |
130 | } | |
131 | ||
3c666182 | 132 | rets = mei_cl_disconnect(cl); |
f35fe5f4 AU |
133 | /* |
134 | * Check again: This is necessary since disconnect releases the lock | |
135 | * and another client can connect in the meantime. | |
136 | */ | |
137 | if (!list_empty(&cl->vtag_map)) { | |
138 | cl_dbg(dev, cl, "not the last vtag after disconnect\n"); | |
139 | mei_cl_flush_queues(cl, file); | |
140 | goto out; | |
141 | } | |
3c666182 | 142 | |
f35fe5f4 | 143 | mei_cl_flush_queues(cl, NULL); |
46922186 | 144 | cl_dbg(dev, cl, "removing\n"); |
a562d5c2 | 145 | |
90e0b5f1 | 146 | mei_cl_unlink(cl); |
f35fe5f4 | 147 | kfree(cl); |
a562d5c2 | 148 | |
f35fe5f4 | 149 | out: |
a562d5c2 | 150 | file->private_data = NULL; |
ab841160 | 151 | |
ab841160 OW |
152 | mutex_unlock(&dev->device_lock); |
153 | return rets; | |
154 | } | |
155 | ||
156 | ||
157 | /** | |
158 | * mei_read - the read function. | |
159 | * | |
160 | * @file: pointer to file structure | |
161 | * @ubuf: pointer to user buffer | |
162 | * @length: buffer length | |
163 | * @offset: data offset in buffer | |
164 | * | |
a8605ea2 | 165 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
166 | */ |
167 | static ssize_t mei_read(struct file *file, char __user *ubuf, | |
441ab50f | 168 | size_t length, loff_t *offset) |
ab841160 OW |
169 | { |
170 | struct mei_cl *cl = file->private_data; | |
ab841160 | 171 | struct mei_device *dev; |
a9bed610 | 172 | struct mei_cl_cb *cb = NULL; |
ff1586a7 | 173 | bool nonblock = !!(file->f_flags & O_NONBLOCK); |
5151e2b5 | 174 | ssize_t rets; |
ab841160 OW |
175 | |
176 | if (WARN_ON(!cl || !cl->dev)) | |
177 | return -ENODEV; | |
178 | ||
179 | dev = cl->dev; | |
180 | ||
dd5de1f1 | 181 | |
ab841160 | 182 | mutex_lock(&dev->device_lock); |
b210d750 | 183 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
184 | rets = -ENODEV; |
185 | goto out; | |
186 | } | |
187 | ||
dd5de1f1 TW |
188 | if (length == 0) { |
189 | rets = 0; | |
190 | goto out; | |
191 | } | |
192 | ||
8b2458f4 AU |
193 | if (ubuf == NULL) { |
194 | rets = -EMSGSIZE; | |
195 | goto out; | |
196 | } | |
197 | ||
a9bed610 | 198 | cb = mei_cl_read_cb(cl, file); |
8b2458f4 AU |
199 | if (cb) |
200 | goto copy_buffer; | |
201 | ||
202 | if (*offset > 0) | |
ab841160 | 203 | *offset = 0; |
ab841160 | 204 | |
ff1586a7 AU |
205 | rets = mei_cl_read_start(cl, length, file); |
206 | if (rets && rets != -EBUSY) { | |
5151e2b5 | 207 | cl_dbg(dev, cl, "mei start read failure status = %zd\n", rets); |
ab841160 OW |
208 | goto out; |
209 | } | |
210 | ||
ff1586a7 AU |
211 | if (nonblock) { |
212 | rets = -EAGAIN; | |
213 | goto out; | |
214 | } | |
215 | ||
cb97fbbc AU |
216 | mutex_unlock(&dev->device_lock); |
217 | if (wait_event_interruptible(cl->rx_wait, | |
d1376f3d | 218 | mei_cl_read_cb(cl, file) || |
cb97fbbc AU |
219 | !mei_cl_is_connected(cl))) { |
220 | if (signal_pending(current)) | |
221 | return -EINTR; | |
222 | return -ERESTARTSYS; | |
223 | } | |
224 | mutex_lock(&dev->device_lock); | |
e2b31644 | 225 | |
cb97fbbc AU |
226 | if (!mei_cl_is_connected(cl)) { |
227 | rets = -ENODEV; | |
228 | goto out; | |
229 | } | |
ab841160 | 230 | |
cb97fbbc AU |
231 | cb = mei_cl_read_cb(cl, file); |
232 | if (!cb) { | |
cb97fbbc AU |
233 | rets = 0; |
234 | goto out; | |
235 | } | |
3d33ff24 | 236 | |
ab841160 | 237 | copy_buffer: |
3d33ff24 TW |
238 | /* now copy the data to user space */ |
239 | if (cb->status) { | |
240 | rets = cb->status; | |
5151e2b5 | 241 | cl_dbg(dev, cl, "read operation failed %zd\n", rets); |
3d33ff24 TW |
242 | goto free; |
243 | } | |
244 | ||
35bf7692 | 245 | cl_dbg(dev, cl, "buf.size = %zu buf.idx = %zu offset = %lld\n", |
8b2458f4 AU |
246 | cb->buf.size, cb->buf_idx, *offset); |
247 | if (*offset >= cb->buf_idx) { | |
248 | rets = 0; | |
ab841160 OW |
249 | goto free; |
250 | } | |
251 | ||
ebb108ef TW |
252 | /* length is being truncated to PAGE_SIZE, |
253 | * however buf_idx may point beyond that */ | |
254 | length = min_t(size_t, length, cb->buf_idx - *offset); | |
ab841160 | 255 | |
5db7514d | 256 | if (copy_to_user(ubuf, cb->buf.data + *offset, length)) { |
2bf94cab | 257 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
ab841160 OW |
258 | rets = -EFAULT; |
259 | goto free; | |
260 | } | |
261 | ||
262 | rets = length; | |
263 | *offset += length; | |
f862b6b2 TW |
264 | /* not all data was read, keep the cb */ |
265 | if (*offset < cb->buf_idx) | |
ab841160 OW |
266 | goto out; |
267 | ||
268 | free: | |
d1376f3d | 269 | mei_cl_del_rd_completed(cl, cb); |
8b2458f4 | 270 | *offset = 0; |
928fa666 | 271 | |
ab841160 | 272 | out: |
5151e2b5 | 273 | cl_dbg(dev, cl, "end mei read rets = %zd\n", rets); |
ab841160 OW |
274 | mutex_unlock(&dev->device_lock); |
275 | return rets; | |
276 | } | |
f35fe5f4 AU |
277 | |
278 | /** | |
279 | * mei_cl_vtag_by_fp - obtain the vtag by file pointer | |
280 | * | |
281 | * @cl: host client | |
282 | * @fp: pointer to file structure | |
283 | * | |
284 | * Return: vtag value on success, otherwise 0 | |
285 | */ | |
286 | static u8 mei_cl_vtag_by_fp(const struct mei_cl *cl, const struct file *fp) | |
287 | { | |
288 | struct mei_cl_vtag *cl_vtag; | |
289 | ||
290 | if (!fp) | |
291 | return 0; | |
292 | ||
293 | list_for_each_entry(cl_vtag, &cl->vtag_map, list) | |
294 | if (cl_vtag->fp == fp) | |
295 | return cl_vtag->vtag; | |
296 | return 0; | |
297 | } | |
298 | ||
ab841160 OW |
299 | /** |
300 | * mei_write - the write function. | |
301 | * | |
302 | * @file: pointer to file structure | |
303 | * @ubuf: pointer to user buffer | |
304 | * @length: buffer length | |
305 | * @offset: data offset in buffer | |
306 | * | |
a8605ea2 | 307 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
308 | */ |
309 | static ssize_t mei_write(struct file *file, const char __user *ubuf, | |
441ab50f | 310 | size_t length, loff_t *offset) |
ab841160 OW |
311 | { |
312 | struct mei_cl *cl = file->private_data; | |
6cbb097f | 313 | struct mei_cl_cb *cb; |
ab841160 | 314 | struct mei_device *dev; |
5151e2b5 | 315 | ssize_t rets; |
ab841160 OW |
316 | |
317 | if (WARN_ON(!cl || !cl->dev)) | |
318 | return -ENODEV; | |
319 | ||
320 | dev = cl->dev; | |
321 | ||
322 | mutex_lock(&dev->device_lock); | |
323 | ||
b210d750 | 324 | if (dev->dev_state != MEI_DEV_ENABLED) { |
75f0ee15 | 325 | rets = -ENODEV; |
4234a6de | 326 | goto out; |
ab841160 OW |
327 | } |
328 | ||
d49ed64a AU |
329 | if (!mei_cl_is_connected(cl)) { |
330 | cl_err(dev, cl, "is not connected"); | |
331 | rets = -ENODEV; | |
4234a6de | 332 | goto out; |
75f0ee15 | 333 | } |
dd5de1f1 | 334 | |
d49ed64a AU |
335 | if (!mei_me_cl_is_active(cl->me_cl)) { |
336 | rets = -ENOTTY; | |
dd5de1f1 TW |
337 | goto out; |
338 | } | |
339 | ||
d49ed64a | 340 | if (length > mei_cl_mtu(cl)) { |
dd5de1f1 | 341 | rets = -EFBIG; |
4234a6de | 342 | goto out; |
75f0ee15 TW |
343 | } |
344 | ||
d49ed64a AU |
345 | if (length == 0) { |
346 | rets = 0; | |
4234a6de | 347 | goto out; |
75f0ee15 | 348 | } |
d49ed64a | 349 | |
af336cab AU |
350 | while (cl->tx_cb_queued >= dev->tx_queue_limit) { |
351 | if (file->f_flags & O_NONBLOCK) { | |
352 | rets = -EAGAIN; | |
353 | goto out; | |
354 | } | |
355 | mutex_unlock(&dev->device_lock); | |
356 | rets = wait_event_interruptible(cl->tx_wait, | |
357 | cl->writing_state == MEI_WRITE_COMPLETE || | |
358 | (!mei_cl_is_connected(cl))); | |
359 | mutex_lock(&dev->device_lock); | |
360 | if (rets) { | |
361 | if (signal_pending(current)) | |
362 | rets = -EINTR; | |
363 | goto out; | |
364 | } | |
365 | if (!mei_cl_is_connected(cl)) { | |
366 | rets = -ENODEV; | |
367 | goto out; | |
368 | } | |
369 | } | |
370 | ||
6cbb097f AU |
371 | cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file); |
372 | if (!cb) { | |
33d28c92 | 373 | rets = -ENOMEM; |
4234a6de | 374 | goto out; |
ab841160 | 375 | } |
f35fe5f4 | 376 | cb->vtag = mei_cl_vtag_by_fp(cl, file); |
ab841160 | 377 | |
6cbb097f | 378 | rets = copy_from_user(cb->buf.data, ubuf, length); |
d8b29efa | 379 | if (rets) { |
2bf94cab | 380 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
d8b29efa | 381 | rets = -EFAULT; |
6cbb097f | 382 | mei_io_cb_free(cb); |
4234a6de | 383 | goto out; |
d8b29efa | 384 | } |
ab841160 | 385 | |
e0cb6b2f | 386 | rets = mei_cl_write(cl, cb); |
b0d0cf77 | 387 | out: |
ab841160 | 388 | mutex_unlock(&dev->device_lock); |
ab841160 OW |
389 | return rets; |
390 | } | |
391 | ||
9f81abda TW |
392 | /** |
393 | * mei_ioctl_connect_client - the connect to fw client IOCTL function | |
394 | * | |
9f81abda | 395 | * @file: private data of the file object |
aa207a05 AU |
396 | * @in_client_uuid: requested UUID for connection |
397 | * @client: IOCTL connect data, output parameters | |
9f81abda TW |
398 | * |
399 | * Locking: called under "dev->device_lock" lock | |
400 | * | |
a8605ea2 | 401 | * Return: 0 on success, <0 on failure. |
9f81abda TW |
402 | */ |
403 | static int mei_ioctl_connect_client(struct file *file, | |
aa207a05 AU |
404 | const uuid_le *in_client_uuid, |
405 | struct mei_client *client) | |
9f81abda TW |
406 | { |
407 | struct mei_device *dev; | |
d320832f | 408 | struct mei_me_client *me_cl; |
9f81abda | 409 | struct mei_cl *cl; |
9f81abda TW |
410 | int rets; |
411 | ||
412 | cl = file->private_data; | |
9f81abda TW |
413 | dev = cl->dev; |
414 | ||
9f81abda | 415 | if (cl->state != MEI_FILE_INITIALIZING && |
79563db9 TW |
416 | cl->state != MEI_FILE_DISCONNECTED) |
417 | return -EBUSY; | |
9f81abda TW |
418 | |
419 | /* find ME client we're trying to connect to */ | |
aa207a05 | 420 | me_cl = mei_me_cl_by_uuid(dev, in_client_uuid); |
f4e06246 | 421 | if (!me_cl) { |
2bf94cab | 422 | dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n", |
aa207a05 | 423 | in_client_uuid); |
f4e06246 AU |
424 | rets = -ENOTTY; |
425 | goto end; | |
426 | } | |
427 | ||
428 | if (me_cl->props.fixed_address) { | |
429 | bool forbidden = dev->override_fixed_address ? | |
430 | !dev->allow_fixed_address : !dev->hbm_f_fa_supported; | |
431 | if (forbidden) { | |
432 | dev_dbg(dev->dev, "Connection forbidden to FW Client UUID = %pUl\n", | |
aa207a05 | 433 | in_client_uuid); |
f4e06246 AU |
434 | rets = -ENOTTY; |
435 | goto end; | |
436 | } | |
9f81abda TW |
437 | } |
438 | ||
2bf94cab | 439 | dev_dbg(dev->dev, "Connect to FW Client ID = %d\n", |
d49ed64a | 440 | me_cl->client_id); |
2bf94cab | 441 | dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n", |
d320832f | 442 | me_cl->props.protocol_version); |
2bf94cab | 443 | dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n", |
d320832f | 444 | me_cl->props.max_msg_length); |
9f81abda | 445 | |
9f81abda | 446 | /* prepare the output buffer */ |
d320832f TW |
447 | client->max_msg_length = me_cl->props.max_msg_length; |
448 | client->protocol_version = me_cl->props.protocol_version; | |
2bf94cab | 449 | dev_dbg(dev->dev, "Can connect?\n"); |
9f81abda | 450 | |
d49ed64a | 451 | rets = mei_cl_connect(cl, me_cl, file); |
9f81abda TW |
452 | |
453 | end: | |
79563db9 | 454 | mei_me_cl_put(me_cl); |
9f81abda TW |
455 | return rets; |
456 | } | |
457 | ||
aa207a05 AU |
458 | /** |
459 | * mei_vt_support_check - check if client support vtags | |
460 | * | |
461 | * Locking: called under "dev->device_lock" lock | |
462 | * | |
463 | * @dev: mei_device | |
464 | * @uuid: client UUID | |
465 | * | |
466 | * Return: | |
467 | * 0 - supported | |
468 | * -ENOTTY - no such client | |
469 | * -EOPNOTSUPP - vtags are not supported by client | |
470 | */ | |
471 | static int mei_vt_support_check(struct mei_device *dev, const uuid_le *uuid) | |
472 | { | |
473 | struct mei_me_client *me_cl; | |
474 | int ret; | |
475 | ||
476 | if (!dev->hbm_f_vt_supported) | |
477 | return -EOPNOTSUPP; | |
478 | ||
479 | me_cl = mei_me_cl_by_uuid(dev, uuid); | |
480 | if (!me_cl) { | |
481 | dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n", | |
482 | uuid); | |
483 | return -ENOTTY; | |
484 | } | |
485 | ret = me_cl->props.vt_supported ? 0 : -EOPNOTSUPP; | |
486 | mei_me_cl_put(me_cl); | |
487 | ||
488 | return ret; | |
489 | } | |
490 | ||
491 | /** | |
492 | * mei_ioctl_connect_vtag - connect to fw client with vtag IOCTL function | |
493 | * | |
494 | * @file: private data of the file object | |
495 | * @in_client_uuid: requested UUID for connection | |
496 | * @client: IOCTL connect data, output parameters | |
497 | * @vtag: vm tag | |
498 | * | |
499 | * Locking: called under "dev->device_lock" lock | |
500 | * | |
501 | * Return: 0 on success, <0 on failure. | |
502 | */ | |
503 | static int mei_ioctl_connect_vtag(struct file *file, | |
504 | const uuid_le *in_client_uuid, | |
505 | struct mei_client *client, | |
506 | u8 vtag) | |
507 | { | |
508 | struct mei_device *dev; | |
509 | struct mei_cl *cl; | |
510 | struct mei_cl *pos; | |
511 | struct mei_cl_vtag *cl_vtag; | |
512 | ||
513 | cl = file->private_data; | |
514 | dev = cl->dev; | |
515 | ||
516 | dev_dbg(dev->dev, "FW Client %pUl vtag %d\n", in_client_uuid, vtag); | |
517 | ||
518 | switch (cl->state) { | |
519 | case MEI_FILE_DISCONNECTED: | |
520 | if (mei_cl_vtag_by_fp(cl, file) != vtag) { | |
521 | dev_err(dev->dev, "reconnect with different vtag\n"); | |
522 | return -EINVAL; | |
523 | } | |
524 | break; | |
525 | case MEI_FILE_INITIALIZING: | |
526 | /* malicious connect from another thread may push vtag */ | |
527 | if (!IS_ERR(mei_cl_fp_by_vtag(cl, vtag))) { | |
528 | dev_err(dev->dev, "vtag already filled\n"); | |
529 | return -EINVAL; | |
530 | } | |
531 | ||
532 | list_for_each_entry(pos, &dev->file_list, link) { | |
533 | if (pos == cl) | |
534 | continue; | |
535 | if (!pos->me_cl) | |
536 | continue; | |
537 | ||
538 | /* only search for same UUID */ | |
539 | if (uuid_le_cmp(*mei_cl_uuid(pos), *in_client_uuid)) | |
540 | continue; | |
541 | ||
542 | /* if tag already exist try another fp */ | |
543 | if (!IS_ERR(mei_cl_fp_by_vtag(pos, vtag))) | |
544 | continue; | |
545 | ||
546 | /* replace cl with acquired one */ | |
547 | dev_dbg(dev->dev, "replacing with existing cl\n"); | |
548 | mei_cl_unlink(cl); | |
549 | kfree(cl); | |
550 | file->private_data = pos; | |
551 | cl = pos; | |
552 | break; | |
553 | } | |
554 | ||
555 | cl_vtag = mei_cl_vtag_alloc(file, vtag); | |
556 | if (IS_ERR(cl_vtag)) | |
557 | return -ENOMEM; | |
558 | ||
559 | list_add_tail(&cl_vtag->list, &cl->vtag_map); | |
560 | break; | |
561 | default: | |
562 | return -EBUSY; | |
563 | } | |
564 | ||
565 | while (cl->state != MEI_FILE_INITIALIZING && | |
566 | cl->state != MEI_FILE_DISCONNECTED && | |
567 | cl->state != MEI_FILE_CONNECTED) { | |
568 | mutex_unlock(&dev->device_lock); | |
569 | wait_event_timeout(cl->wait, | |
570 | (cl->state == MEI_FILE_CONNECTED || | |
571 | cl->state == MEI_FILE_DISCONNECTED || | |
572 | cl->state == MEI_FILE_DISCONNECT_REQUIRED || | |
573 | cl->state == MEI_FILE_DISCONNECT_REPLY), | |
95953618 | 574 | dev->timeouts.cl_connect); |
aa207a05 AU |
575 | mutex_lock(&dev->device_lock); |
576 | } | |
577 | ||
578 | if (!mei_cl_is_connected(cl)) | |
579 | return mei_ioctl_connect_client(file, in_client_uuid, client); | |
580 | ||
581 | client->max_msg_length = cl->me_cl->props.max_msg_length; | |
582 | client->protocol_version = cl->me_cl->props.protocol_version; | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
3c7c8468 TW |
587 | /** |
588 | * mei_ioctl_client_notify_request - | |
589 | * propagate event notification request to client | |
590 | * | |
591 | * @file: pointer to file structure | |
592 | * @request: 0 - disable, 1 - enable | |
593 | * | |
594 | * Return: 0 on success , <0 on error | |
595 | */ | |
f23e2cc4 | 596 | static int mei_ioctl_client_notify_request(const struct file *file, u32 request) |
3c7c8468 TW |
597 | { |
598 | struct mei_cl *cl = file->private_data; | |
599 | ||
7326fffb AU |
600 | if (request != MEI_HBM_NOTIFICATION_START && |
601 | request != MEI_HBM_NOTIFICATION_STOP) | |
602 | return -EINVAL; | |
603 | ||
604 | return mei_cl_notify_request(cl, file, (u8)request); | |
3c7c8468 TW |
605 | } |
606 | ||
607 | /** | |
608 | * mei_ioctl_client_notify_get - wait for notification request | |
609 | * | |
610 | * @file: pointer to file structure | |
611 | * @notify_get: 0 - disable, 1 - enable | |
612 | * | |
613 | * Return: 0 on success , <0 on error | |
614 | */ | |
f23e2cc4 | 615 | static int mei_ioctl_client_notify_get(const struct file *file, u32 *notify_get) |
3c7c8468 TW |
616 | { |
617 | struct mei_cl *cl = file->private_data; | |
618 | bool notify_ev; | |
619 | bool block = (file->f_flags & O_NONBLOCK) == 0; | |
620 | int rets; | |
621 | ||
622 | rets = mei_cl_notify_get(cl, block, ¬ify_ev); | |
623 | if (rets) | |
624 | return rets; | |
625 | ||
626 | *notify_get = notify_ev ? 1 : 0; | |
627 | return 0; | |
628 | } | |
629 | ||
ab841160 OW |
630 | /** |
631 | * mei_ioctl - the IOCTL function | |
632 | * | |
633 | * @file: pointer to file structure | |
634 | * @cmd: ioctl command | |
635 | * @data: pointer to mei message structure | |
636 | * | |
a8605ea2 | 637 | * Return: 0 on success , <0 on error |
ab841160 OW |
638 | */ |
639 | static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data) | |
640 | { | |
641 | struct mei_device *dev; | |
642 | struct mei_cl *cl = file->private_data; | |
aa207a05 AU |
643 | struct mei_connect_client_data conn; |
644 | struct mei_connect_client_data_vtag conn_vtag; | |
645 | const uuid_le *cl_uuid; | |
646 | struct mei_client *props; | |
647 | u8 vtag; | |
3c7c8468 | 648 | u32 notify_get, notify_req; |
ab841160 OW |
649 | int rets; |
650 | ||
ab841160 OW |
651 | |
652 | if (WARN_ON(!cl || !cl->dev)) | |
653 | return -ENODEV; | |
654 | ||
655 | dev = cl->dev; | |
656 | ||
2bf94cab | 657 | dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd); |
ab841160 OW |
658 | |
659 | mutex_lock(&dev->device_lock); | |
b210d750 | 660 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
661 | rets = -ENODEV; |
662 | goto out; | |
663 | } | |
664 | ||
4f046e7b TW |
665 | switch (cmd) { |
666 | case IOCTL_MEI_CONNECT_CLIENT: | |
2bf94cab | 667 | dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n"); |
aa207a05 | 668 | if (copy_from_user(&conn, (char __user *)data, sizeof(conn))) { |
2bf94cab | 669 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
4f046e7b TW |
670 | rets = -EFAULT; |
671 | goto out; | |
672 | } | |
aa207a05 AU |
673 | cl_uuid = &conn.in_client_uuid; |
674 | props = &conn.out_client_properties; | |
675 | vtag = 0; | |
676 | ||
677 | rets = mei_vt_support_check(dev, cl_uuid); | |
678 | if (rets == -ENOTTY) | |
679 | goto out; | |
680 | if (!rets) | |
681 | rets = mei_ioctl_connect_vtag(file, cl_uuid, props, | |
682 | vtag); | |
683 | else | |
684 | rets = mei_ioctl_connect_client(file, cl_uuid, props); | |
685 | if (rets) | |
686 | goto out; | |
687 | ||
688 | /* if all is ok, copying the data back to user. */ | |
689 | if (copy_to_user((char __user *)data, &conn, sizeof(conn))) { | |
690 | dev_dbg(dev->dev, "failed to copy data to userland\n"); | |
691 | rets = -EFAULT; | |
692 | goto out; | |
693 | } | |
694 | ||
695 | break; | |
696 | ||
697 | case IOCTL_MEI_CONNECT_CLIENT_VTAG: | |
698 | dev_dbg(dev->dev, "IOCTL_MEI_CONNECT_CLIENT_VTAG\n"); | |
699 | if (copy_from_user(&conn_vtag, (char __user *)data, | |
700 | sizeof(conn_vtag))) { | |
701 | dev_dbg(dev->dev, "failed to copy data from userland\n"); | |
702 | rets = -EFAULT; | |
703 | goto out; | |
704 | } | |
705 | ||
706 | cl_uuid = &conn_vtag.connect.in_client_uuid; | |
707 | props = &conn_vtag.out_client_properties; | |
708 | vtag = conn_vtag.connect.vtag; | |
709 | ||
710 | rets = mei_vt_support_check(dev, cl_uuid); | |
711 | if (rets == -EOPNOTSUPP) | |
712 | dev_dbg(dev->dev, "FW Client %pUl does not support vtags\n", | |
713 | cl_uuid); | |
714 | if (rets) | |
715 | goto out; | |
716 | ||
717 | if (!vtag) { | |
718 | dev_dbg(dev->dev, "vtag can't be zero\n"); | |
719 | rets = -EINVAL; | |
720 | goto out; | |
721 | } | |
ab841160 | 722 | |
aa207a05 | 723 | rets = mei_ioctl_connect_vtag(file, cl_uuid, props, vtag); |
4f046e7b TW |
724 | if (rets) |
725 | goto out; | |
ab841160 | 726 | |
4f046e7b | 727 | /* if all is ok, copying the data back to user. */ |
aa207a05 AU |
728 | if (copy_to_user((char __user *)data, &conn_vtag, |
729 | sizeof(conn_vtag))) { | |
2bf94cab | 730 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
4f046e7b TW |
731 | rets = -EFAULT; |
732 | goto out; | |
733 | } | |
734 | ||
735 | break; | |
154eb18f | 736 | |
3c7c8468 TW |
737 | case IOCTL_MEI_NOTIFY_SET: |
738 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_SET.\n"); | |
739 | if (copy_from_user(¬ify_req, | |
740 | (char __user *)data, sizeof(notify_req))) { | |
741 | dev_dbg(dev->dev, "failed to copy data from userland\n"); | |
742 | rets = -EFAULT; | |
743 | goto out; | |
744 | } | |
745 | rets = mei_ioctl_client_notify_request(file, notify_req); | |
746 | break; | |
747 | ||
748 | case IOCTL_MEI_NOTIFY_GET: | |
749 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_GET.\n"); | |
750 | rets = mei_ioctl_client_notify_get(file, ¬ify_get); | |
751 | if (rets) | |
752 | goto out; | |
753 | ||
754 | dev_dbg(dev->dev, "copy connect data to user\n"); | |
755 | if (copy_to_user((char __user *)data, | |
756 | ¬ify_get, sizeof(notify_get))) { | |
757 | dev_dbg(dev->dev, "failed to copy data to userland\n"); | |
758 | rets = -EFAULT; | |
759 | goto out; | |
760 | ||
761 | } | |
762 | break; | |
763 | ||
4f046e7b | 764 | default: |
4f046e7b | 765 | rets = -ENOIOCTLCMD; |
ab841160 OW |
766 | } |
767 | ||
768 | out: | |
ab841160 OW |
769 | mutex_unlock(&dev->device_lock); |
770 | return rets; | |
771 | } | |
772 | ||
ab841160 OW |
773 | /** |
774 | * mei_poll - the poll function | |
775 | * | |
776 | * @file: pointer to file structure | |
777 | * @wait: pointer to poll_table structure | |
778 | * | |
a8605ea2 | 779 | * Return: poll mask |
ab841160 | 780 | */ |
afc9a42b | 781 | static __poll_t mei_poll(struct file *file, poll_table *wait) |
ab841160 | 782 | { |
01699437 | 783 | __poll_t req_events = poll_requested_events(wait); |
ab841160 OW |
784 | struct mei_cl *cl = file->private_data; |
785 | struct mei_device *dev; | |
afc9a42b | 786 | __poll_t mask = 0; |
2c84c297 | 787 | bool notify_en; |
ab841160 OW |
788 | |
789 | if (WARN_ON(!cl || !cl->dev)) | |
a9a08845 | 790 | return EPOLLERR; |
ab841160 OW |
791 | |
792 | dev = cl->dev; | |
793 | ||
794 | mutex_lock(&dev->device_lock); | |
795 | ||
a9a08845 | 796 | notify_en = cl->notify_en && (req_events & EPOLLPRI); |
f3de9b63 TW |
797 | |
798 | if (dev->dev_state != MEI_DEV_ENABLED || | |
799 | !mei_cl_is_connected(cl)) { | |
a9a08845 | 800 | mask = EPOLLERR; |
ab841160 OW |
801 | goto out; |
802 | } | |
803 | ||
2c84c297 TW |
804 | if (notify_en) { |
805 | poll_wait(file, &cl->ev_wait, wait); | |
806 | if (cl->notify_ev) | |
a9a08845 | 807 | mask |= EPOLLPRI; |
2c84c297 | 808 | } |
9fa0be8b | 809 | |
a9a08845 | 810 | if (req_events & (EPOLLIN | EPOLLRDNORM)) { |
1d9013f0 TW |
811 | poll_wait(file, &cl->rx_wait, wait); |
812 | ||
d1376f3d | 813 | if (mei_cl_read_cb(cl, file)) |
a9a08845 | 814 | mask |= EPOLLIN | EPOLLRDNORM; |
1d9013f0 | 815 | else |
3030dc05 | 816 | mei_cl_read_start(cl, mei_cl_mtu(cl), file); |
1d9013f0 | 817 | } |
ab841160 | 818 | |
03b2cbb6 | 819 | if (req_events & (EPOLLOUT | EPOLLWRNORM)) { |
af336cab AU |
820 | poll_wait(file, &cl->tx_wait, wait); |
821 | if (cl->tx_cb_queued < dev->tx_queue_limit) | |
03b2cbb6 | 822 | mask |= EPOLLOUT | EPOLLWRNORM; |
af336cab AU |
823 | } |
824 | ||
ab841160 OW |
825 | out: |
826 | mutex_unlock(&dev->device_lock); | |
827 | return mask; | |
828 | } | |
829 | ||
58cde1a6 AU |
830 | /** |
831 | * mei_cl_is_write_queued - check if the client has pending writes. | |
832 | * | |
833 | * @cl: writing host client | |
834 | * | |
835 | * Return: true if client is writing, false otherwise. | |
836 | */ | |
837 | static bool mei_cl_is_write_queued(struct mei_cl *cl) | |
838 | { | |
839 | struct mei_device *dev = cl->dev; | |
840 | struct mei_cl_cb *cb; | |
841 | ||
842 | list_for_each_entry(cb, &dev->write_list, list) | |
843 | if (cb->cl == cl) | |
844 | return true; | |
845 | list_for_each_entry(cb, &dev->write_waiting_list, list) | |
846 | if (cb->cl == cl) | |
847 | return true; | |
848 | return false; | |
849 | } | |
850 | ||
851 | /** | |
852 | * mei_fsync - the fsync handler | |
853 | * | |
854 | * @fp: pointer to file structure | |
855 | * @start: unused | |
856 | * @end: unused | |
857 | * @datasync: unused | |
858 | * | |
859 | * Return: 0 on success, -ENODEV if client is not connected | |
860 | */ | |
861 | static int mei_fsync(struct file *fp, loff_t start, loff_t end, int datasync) | |
862 | { | |
863 | struct mei_cl *cl = fp->private_data; | |
864 | struct mei_device *dev; | |
865 | int rets; | |
866 | ||
867 | if (WARN_ON(!cl || !cl->dev)) | |
868 | return -ENODEV; | |
869 | ||
870 | dev = cl->dev; | |
871 | ||
872 | mutex_lock(&dev->device_lock); | |
873 | ||
874 | if (dev->dev_state != MEI_DEV_ENABLED || !mei_cl_is_connected(cl)) { | |
875 | rets = -ENODEV; | |
876 | goto out; | |
877 | } | |
878 | ||
879 | while (mei_cl_is_write_queued(cl)) { | |
880 | mutex_unlock(&dev->device_lock); | |
881 | rets = wait_event_interruptible(cl->tx_wait, | |
882 | cl->writing_state == MEI_WRITE_COMPLETE || | |
883 | !mei_cl_is_connected(cl)); | |
884 | mutex_lock(&dev->device_lock); | |
885 | if (rets) { | |
886 | if (signal_pending(current)) | |
887 | rets = -EINTR; | |
888 | goto out; | |
889 | } | |
890 | if (!mei_cl_is_connected(cl)) { | |
891 | rets = -ENODEV; | |
892 | goto out; | |
893 | } | |
894 | } | |
895 | rets = 0; | |
896 | out: | |
897 | mutex_unlock(&dev->device_lock); | |
898 | return rets; | |
899 | } | |
900 | ||
237092bf TW |
901 | /** |
902 | * mei_fasync - asynchronous io support | |
903 | * | |
904 | * @fd: file descriptor | |
905 | * @file: pointer to file structure | |
906 | * @band: band bitmap | |
907 | * | |
ed6dc538 TW |
908 | * Return: negative on error, |
909 | * 0 if it did no changes, | |
910 | * and positive a process was added or deleted | |
237092bf TW |
911 | */ |
912 | static int mei_fasync(int fd, struct file *file, int band) | |
913 | { | |
914 | ||
915 | struct mei_cl *cl = file->private_data; | |
916 | ||
917 | if (!mei_cl_is_connected(cl)) | |
ed6dc538 | 918 | return -ENODEV; |
237092bf TW |
919 | |
920 | return fasync_helper(fd, file, band, &cl->ev_async); | |
921 | } | |
922 | ||
52f6efdf AU |
923 | /** |
924 | * trc_show - mei device trc attribute show method | |
925 | * | |
926 | * @device: device pointer | |
927 | * @attr: attribute pointer | |
928 | * @buf: char out buffer | |
929 | * | |
930 | * Return: number of the bytes printed into buf or error | |
931 | */ | |
932 | static ssize_t trc_show(struct device *device, | |
933 | struct device_attribute *attr, char *buf) | |
934 | { | |
935 | struct mei_device *dev = dev_get_drvdata(device); | |
936 | u32 trc; | |
937 | int ret; | |
938 | ||
939 | ret = mei_trc_status(dev, &trc); | |
940 | if (ret) | |
941 | return ret; | |
942 | return sprintf(buf, "%08X\n", trc); | |
943 | } | |
944 | static DEVICE_ATTR_RO(trc); | |
945 | ||
55c4e640 | 946 | /** |
88d1bece | 947 | * fw_status_show - mei device fw_status attribute show method |
55c4e640 TW |
948 | * |
949 | * @device: device pointer | |
950 | * @attr: attribute pointer | |
951 | * @buf: char out buffer | |
952 | * | |
953 | * Return: number of the bytes printed into buf or error | |
954 | */ | |
955 | static ssize_t fw_status_show(struct device *device, | |
956 | struct device_attribute *attr, char *buf) | |
957 | { | |
958 | struct mei_device *dev = dev_get_drvdata(device); | |
959 | struct mei_fw_status fw_status; | |
960 | int err, i; | |
961 | ssize_t cnt = 0; | |
962 | ||
963 | mutex_lock(&dev->device_lock); | |
964 | err = mei_fw_status(dev, &fw_status); | |
965 | mutex_unlock(&dev->device_lock); | |
966 | if (err) { | |
967 | dev_err(device, "read fw_status error = %d\n", err); | |
968 | return err; | |
969 | } | |
970 | ||
971 | for (i = 0; i < fw_status.count; i++) | |
972 | cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n", | |
973 | fw_status.status[i]); | |
974 | return cnt; | |
975 | } | |
976 | static DEVICE_ATTR_RO(fw_status); | |
977 | ||
88d1bece AU |
978 | /** |
979 | * hbm_ver_show - display HBM protocol version negotiated with FW | |
980 | * | |
981 | * @device: device pointer | |
982 | * @attr: attribute pointer | |
983 | * @buf: char out buffer | |
984 | * | |
985 | * Return: number of the bytes printed into buf or error | |
986 | */ | |
987 | static ssize_t hbm_ver_show(struct device *device, | |
988 | struct device_attribute *attr, char *buf) | |
989 | { | |
990 | struct mei_device *dev = dev_get_drvdata(device); | |
991 | struct hbm_version ver; | |
992 | ||
993 | mutex_lock(&dev->device_lock); | |
994 | ver = dev->version; | |
995 | mutex_unlock(&dev->device_lock); | |
996 | ||
997 | return sprintf(buf, "%u.%u\n", ver.major_version, ver.minor_version); | |
998 | } | |
999 | static DEVICE_ATTR_RO(hbm_ver); | |
1000 | ||
1001 | /** | |
1002 | * hbm_ver_drv_show - display HBM protocol version advertised by driver | |
1003 | * | |
1004 | * @device: device pointer | |
1005 | * @attr: attribute pointer | |
1006 | * @buf: char out buffer | |
1007 | * | |
1008 | * Return: number of the bytes printed into buf or error | |
1009 | */ | |
1010 | static ssize_t hbm_ver_drv_show(struct device *device, | |
1011 | struct device_attribute *attr, char *buf) | |
1012 | { | |
1013 | return sprintf(buf, "%u.%u\n", HBM_MAJOR_VERSION, HBM_MINOR_VERSION); | |
1014 | } | |
1015 | static DEVICE_ATTR_RO(hbm_ver_drv); | |
1016 | ||
af336cab AU |
1017 | static ssize_t tx_queue_limit_show(struct device *device, |
1018 | struct device_attribute *attr, char *buf) | |
1019 | { | |
1020 | struct mei_device *dev = dev_get_drvdata(device); | |
1021 | u8 size = 0; | |
1022 | ||
1023 | mutex_lock(&dev->device_lock); | |
1024 | size = dev->tx_queue_limit; | |
1025 | mutex_unlock(&dev->device_lock); | |
1026 | ||
e666b79e | 1027 | return sysfs_emit(buf, "%u\n", size); |
af336cab AU |
1028 | } |
1029 | ||
1030 | static ssize_t tx_queue_limit_store(struct device *device, | |
1031 | struct device_attribute *attr, | |
1032 | const char *buf, size_t count) | |
1033 | { | |
1034 | struct mei_device *dev = dev_get_drvdata(device); | |
1035 | u8 limit; | |
1036 | unsigned int inp; | |
1037 | int err; | |
1038 | ||
1039 | err = kstrtouint(buf, 10, &inp); | |
1040 | if (err) | |
1041 | return err; | |
1042 | if (inp > MEI_TX_QUEUE_LIMIT_MAX || inp < MEI_TX_QUEUE_LIMIT_MIN) | |
1043 | return -EINVAL; | |
1044 | limit = inp; | |
1045 | ||
1046 | mutex_lock(&dev->device_lock); | |
1047 | dev->tx_queue_limit = limit; | |
1048 | mutex_unlock(&dev->device_lock); | |
1049 | ||
1050 | return count; | |
1051 | } | |
1052 | static DEVICE_ATTR_RW(tx_queue_limit); | |
1053 | ||
3cfaeb33 AU |
1054 | /** |
1055 | * fw_ver_show - display ME FW version | |
1056 | * | |
1057 | * @device: device pointer | |
1058 | * @attr: attribute pointer | |
1059 | * @buf: char out buffer | |
1060 | * | |
1061 | * Return: number of the bytes printed into buf or error | |
1062 | */ | |
1063 | static ssize_t fw_ver_show(struct device *device, | |
1064 | struct device_attribute *attr, char *buf) | |
1065 | { | |
1066 | struct mei_device *dev = dev_get_drvdata(device); | |
1067 | struct mei_fw_version *ver; | |
1068 | ssize_t cnt = 0; | |
1069 | int i; | |
1070 | ||
1071 | ver = dev->fw_ver; | |
1072 | ||
1073 | for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++) | |
1074 | cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%u:%u.%u.%u.%u\n", | |
1075 | ver[i].platform, ver[i].major, ver[i].minor, | |
1076 | ver[i].hotfix, ver[i].buildno); | |
1077 | return cnt; | |
1078 | } | |
1079 | static DEVICE_ATTR_RO(fw_ver); | |
1080 | ||
43b8a7ed AU |
1081 | /** |
1082 | * dev_state_show - display device state | |
1083 | * | |
1084 | * @device: device pointer | |
1085 | * @attr: attribute pointer | |
1086 | * @buf: char out buffer | |
1087 | * | |
1088 | * Return: number of the bytes printed into buf or error | |
1089 | */ | |
1090 | static ssize_t dev_state_show(struct device *device, | |
1091 | struct device_attribute *attr, char *buf) | |
1092 | { | |
1093 | struct mei_device *dev = dev_get_drvdata(device); | |
1094 | enum mei_dev_state dev_state; | |
1095 | ||
1096 | mutex_lock(&dev->device_lock); | |
1097 | dev_state = dev->dev_state; | |
1098 | mutex_unlock(&dev->device_lock); | |
1099 | ||
1100 | return sprintf(buf, "%s", mei_dev_state_str(dev_state)); | |
1101 | } | |
1102 | static DEVICE_ATTR_RO(dev_state); | |
1103 | ||
43b8a7ed | 1104 | /** |
09f8c33a | 1105 | * mei_set_devstate: set to new device state and notify sysfs file. |
43b8a7ed AU |
1106 | * |
1107 | * @dev: mei_device | |
1108 | * @state: new device state | |
1109 | */ | |
1110 | void mei_set_devstate(struct mei_device *dev, enum mei_dev_state state) | |
1111 | { | |
1112 | struct device *clsdev; | |
1113 | ||
1114 | if (dev->dev_state == state) | |
1115 | return; | |
1116 | ||
1117 | dev->dev_state = state; | |
1118 | ||
4495dfdd | 1119 | clsdev = class_find_device_by_devt(mei_class, dev->cdev.dev); |
43b8a7ed AU |
1120 | if (clsdev) { |
1121 | sysfs_notify(&clsdev->kobj, NULL, "dev_state"); | |
1122 | put_device(clsdev); | |
1123 | } | |
1124 | } | |
1125 | ||
2f79d3d1 AU |
1126 | /** |
1127 | * kind_show - display device kind | |
1128 | * | |
1129 | * @device: device pointer | |
1130 | * @attr: attribute pointer | |
1131 | * @buf: char out buffer | |
1132 | * | |
1133 | * Return: number of the bytes printed into buf or error | |
1134 | */ | |
1135 | static ssize_t kind_show(struct device *device, | |
1136 | struct device_attribute *attr, char *buf) | |
1137 | { | |
1138 | struct mei_device *dev = dev_get_drvdata(device); | |
1139 | ssize_t ret; | |
1140 | ||
1141 | if (dev->kind) | |
1142 | ret = sprintf(buf, "%s\n", dev->kind); | |
1143 | else | |
1144 | ret = sprintf(buf, "%s\n", "mei"); | |
1145 | ||
1146 | return ret; | |
1147 | } | |
1148 | static DEVICE_ATTR_RO(kind); | |
1149 | ||
55c4e640 TW |
1150 | static struct attribute *mei_attrs[] = { |
1151 | &dev_attr_fw_status.attr, | |
88d1bece AU |
1152 | &dev_attr_hbm_ver.attr, |
1153 | &dev_attr_hbm_ver_drv.attr, | |
af336cab | 1154 | &dev_attr_tx_queue_limit.attr, |
3cfaeb33 | 1155 | &dev_attr_fw_ver.attr, |
43b8a7ed | 1156 | &dev_attr_dev_state.attr, |
52f6efdf | 1157 | &dev_attr_trc.attr, |
2f79d3d1 | 1158 | &dev_attr_kind.attr, |
55c4e640 TW |
1159 | NULL |
1160 | }; | |
1161 | ATTRIBUTE_GROUPS(mei); | |
1162 | ||
5b881e3c OW |
1163 | /* |
1164 | * file operations structure will be used for mei char device. | |
1165 | */ | |
1166 | static const struct file_operations mei_fops = { | |
1167 | .owner = THIS_MODULE, | |
1168 | .read = mei_read, | |
1169 | .unlocked_ioctl = mei_ioctl, | |
407e9ef7 | 1170 | .compat_ioctl = compat_ptr_ioctl, |
5b881e3c OW |
1171 | .open = mei_open, |
1172 | .release = mei_release, | |
1173 | .write = mei_write, | |
1174 | .poll = mei_poll, | |
58cde1a6 | 1175 | .fsync = mei_fsync, |
237092bf | 1176 | .fasync = mei_fasync, |
5b881e3c OW |
1177 | .llseek = no_llseek |
1178 | }; | |
1179 | ||
f3d8e878 AU |
1180 | /** |
1181 | * mei_minor_get - obtain next free device minor number | |
1182 | * | |
1183 | * @dev: device pointer | |
1184 | * | |
a8605ea2 | 1185 | * Return: allocated minor, or -ENOSPC if no free minor left |
5b881e3c | 1186 | */ |
f3d8e878 AU |
1187 | static int mei_minor_get(struct mei_device *dev) |
1188 | { | |
1189 | int ret; | |
1190 | ||
1191 | mutex_lock(&mei_minor_lock); | |
1192 | ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL); | |
1193 | if (ret >= 0) | |
1194 | dev->minor = ret; | |
1195 | else if (ret == -ENOSPC) | |
2bf94cab | 1196 | dev_err(dev->dev, "too many mei devices\n"); |
5b881e3c | 1197 | |
f3d8e878 AU |
1198 | mutex_unlock(&mei_minor_lock); |
1199 | return ret; | |
1200 | } | |
30e53bb8 | 1201 | |
f3d8e878 AU |
1202 | /** |
1203 | * mei_minor_free - mark device minor number as free | |
1204 | * | |
1205 | * @dev: device pointer | |
1206 | */ | |
1207 | static void mei_minor_free(struct mei_device *dev) | |
9a123f19 | 1208 | { |
f3d8e878 AU |
1209 | mutex_lock(&mei_minor_lock); |
1210 | idr_remove(&mei_idr, dev->minor); | |
1211 | mutex_unlock(&mei_minor_lock); | |
1212 | } | |
1213 | ||
1214 | int mei_register(struct mei_device *dev, struct device *parent) | |
1215 | { | |
1216 | struct device *clsdev; /* class device */ | |
1217 | int ret, devno; | |
1218 | ||
1219 | ret = mei_minor_get(dev); | |
1220 | if (ret < 0) | |
30e53bb8 TW |
1221 | return ret; |
1222 | ||
f3d8e878 AU |
1223 | /* Fill in the data structures */ |
1224 | devno = MKDEV(MAJOR(mei_devt), dev->minor); | |
1225 | cdev_init(&dev->cdev, &mei_fops); | |
154322f4 | 1226 | dev->cdev.owner = parent->driver->owner; |
f3d8e878 AU |
1227 | |
1228 | /* Add the device */ | |
1229 | ret = cdev_add(&dev->cdev, devno, 1); | |
1230 | if (ret) { | |
1231 | dev_err(parent, "unable to add device %d:%d\n", | |
1232 | MAJOR(mei_devt), dev->minor); | |
1233 | goto err_dev_add; | |
1234 | } | |
1235 | ||
55c4e640 TW |
1236 | clsdev = device_create_with_groups(mei_class, parent, devno, |
1237 | dev, mei_groups, | |
1238 | "mei%d", dev->minor); | |
f3d8e878 AU |
1239 | |
1240 | if (IS_ERR(clsdev)) { | |
1241 | dev_err(parent, "unable to create device %d:%d\n", | |
1242 | MAJOR(mei_devt), dev->minor); | |
1243 | ret = PTR_ERR(clsdev); | |
1244 | goto err_dev_create; | |
1245 | } | |
1246 | ||
5666d896 | 1247 | mei_dbgfs_register(dev, dev_name(clsdev)); |
30e53bb8 TW |
1248 | |
1249 | return 0; | |
f3d8e878 | 1250 | |
f3d8e878 AU |
1251 | err_dev_create: |
1252 | cdev_del(&dev->cdev); | |
1253 | err_dev_add: | |
1254 | mei_minor_free(dev); | |
1255 | return ret; | |
5b881e3c | 1256 | } |
40e0b67b | 1257 | EXPORT_SYMBOL_GPL(mei_register); |
5b881e3c | 1258 | |
30e53bb8 | 1259 | void mei_deregister(struct mei_device *dev) |
5b881e3c | 1260 | { |
f3d8e878 AU |
1261 | int devno; |
1262 | ||
1263 | devno = dev->cdev.dev; | |
1264 | cdev_del(&dev->cdev); | |
1265 | ||
30e53bb8 | 1266 | mei_dbgfs_deregister(dev); |
f3d8e878 AU |
1267 | |
1268 | device_destroy(mei_class, devno); | |
1269 | ||
1270 | mei_minor_free(dev); | |
5b881e3c | 1271 | } |
40e0b67b | 1272 | EXPORT_SYMBOL_GPL(mei_deregister); |
ab841160 | 1273 | |
cf3baefb SO |
1274 | static int __init mei_init(void) |
1275 | { | |
f3d8e878 AU |
1276 | int ret; |
1277 | ||
1278 | mei_class = class_create(THIS_MODULE, "mei"); | |
1279 | if (IS_ERR(mei_class)) { | |
1280 | pr_err("couldn't create class\n"); | |
1281 | ret = PTR_ERR(mei_class); | |
1282 | goto err; | |
1283 | } | |
1284 | ||
1285 | ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei"); | |
1286 | if (ret < 0) { | |
1287 | pr_err("unable to allocate char dev region\n"); | |
1288 | goto err_class; | |
1289 | } | |
1290 | ||
1291 | ret = mei_cl_bus_init(); | |
1292 | if (ret < 0) { | |
1293 | pr_err("unable to initialize bus\n"); | |
1294 | goto err_chrdev; | |
1295 | } | |
1296 | ||
1297 | return 0; | |
1298 | ||
1299 | err_chrdev: | |
1300 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); | |
1301 | err_class: | |
1302 | class_destroy(mei_class); | |
1303 | err: | |
1304 | return ret; | |
cf3baefb SO |
1305 | } |
1306 | ||
1307 | static void __exit mei_exit(void) | |
1308 | { | |
f3d8e878 AU |
1309 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); |
1310 | class_destroy(mei_class); | |
cf3baefb SO |
1311 | mei_cl_bus_exit(); |
1312 | } | |
1313 | ||
1314 | module_init(mei_init); | |
1315 | module_exit(mei_exit); | |
1316 | ||
40e0b67b TW |
1317 | MODULE_AUTHOR("Intel Corporation"); |
1318 | MODULE_DESCRIPTION("Intel(R) Management Engine Interface"); | |
827eef51 | 1319 | MODULE_LICENSE("GPL v2"); |
ab841160 | 1320 |