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> | |
ab841160 OW |
29 | #include <linux/sched.h> |
30 | #include <linux/uuid.h> | |
31 | #include <linux/compat.h> | |
32 | #include <linux/jiffies.h> | |
33 | #include <linux/interrupt.h> | |
34 | ||
4f3afe1d | 35 | #include <linux/mei.h> |
47a73801 TW |
36 | |
37 | #include "mei_dev.h" | |
90e0b5f1 | 38 | #include "client.h" |
ab841160 | 39 | |
ab841160 OW |
40 | /** |
41 | * mei_open - the open function | |
42 | * | |
43 | * @inode: pointer to inode structure | |
44 | * @file: pointer to file structure | |
83ce0741 | 45 | * |
a8605ea2 | 46 | * Return: 0 on success, <0 on error |
ab841160 OW |
47 | */ |
48 | static int mei_open(struct inode *inode, struct file *file) | |
49 | { | |
ab841160 | 50 | struct mei_device *dev; |
f3d8e878 | 51 | struct mei_cl *cl; |
2703d4b2 | 52 | |
6f37aca8 | 53 | int err; |
ab841160 | 54 | |
f3d8e878 | 55 | dev = container_of(inode->i_cdev, struct mei_device, cdev); |
5b881e3c | 56 | if (!dev) |
e036cc57 | 57 | return -ENODEV; |
ab841160 OW |
58 | |
59 | mutex_lock(&dev->device_lock); | |
e036cc57 | 60 | |
b210d750 | 61 | if (dev->dev_state != MEI_DEV_ENABLED) { |
2bf94cab | 62 | dev_dbg(dev->dev, "dev_state != MEI_ENABLED dev_state = %s\n", |
b210d750 | 63 | mei_dev_state_str(dev->dev_state)); |
03b8d341 | 64 | err = -ENODEV; |
e036cc57 | 65 | goto err_unlock; |
1b812947 | 66 | } |
ab841160 | 67 | |
7851e008 | 68 | cl = mei_cl_alloc_linked(dev); |
03b8d341 TW |
69 | if (IS_ERR(cl)) { |
70 | err = PTR_ERR(cl); | |
e036cc57 | 71 | goto err_unlock; |
03b8d341 | 72 | } |
ab841160 | 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 | ||
185 | if (rets == -EBUSY && | |
186 | !mei_cl_enqueue_ctrl_wr_cb(cl, length, MEI_FOP_READ, file)) { | |
187 | rets = -ENOMEM; | |
188 | goto out; | |
189 | } | |
ab841160 | 190 | |
ff1586a7 | 191 | do { |
ab841160 OW |
192 | mutex_unlock(&dev->device_lock); |
193 | ||
194 | if (wait_event_interruptible(cl->rx_wait, | |
ff1586a7 AU |
195 | (!list_empty(&cl->rd_completed)) || |
196 | (!mei_cl_is_connected(cl)))) { | |
e2b31644 | 197 | |
ab841160 OW |
198 | if (signal_pending(current)) |
199 | return -EINTR; | |
200 | return -ERESTARTSYS; | |
201 | } | |
202 | ||
203 | mutex_lock(&dev->device_lock); | |
6a84d63d | 204 | if (!mei_cl_is_connected(cl)) { |
2d4d5481 | 205 | rets = -ENODEV; |
ab841160 OW |
206 | goto out; |
207 | } | |
ab841160 | 208 | |
ff1586a7 AU |
209 | cb = mei_cl_read_cb(cl, file); |
210 | } while (!cb); | |
3d33ff24 | 211 | |
ab841160 | 212 | copy_buffer: |
3d33ff24 TW |
213 | /* now copy the data to user space */ |
214 | if (cb->status) { | |
215 | rets = cb->status; | |
292f82c8 | 216 | cl_dbg(dev, cl, "read operation failed %d\n", rets); |
3d33ff24 TW |
217 | goto free; |
218 | } | |
219 | ||
35bf7692 | 220 | cl_dbg(dev, cl, "buf.size = %zu buf.idx = %zu offset = %lld\n", |
8b2458f4 AU |
221 | cb->buf.size, cb->buf_idx, *offset); |
222 | if (*offset >= cb->buf_idx) { | |
223 | rets = 0; | |
ab841160 OW |
224 | goto free; |
225 | } | |
226 | ||
ebb108ef TW |
227 | /* length is being truncated to PAGE_SIZE, |
228 | * however buf_idx may point beyond that */ | |
229 | length = min_t(size_t, length, cb->buf_idx - *offset); | |
ab841160 | 230 | |
5db7514d | 231 | if (copy_to_user(ubuf, cb->buf.data + *offset, length)) { |
2bf94cab | 232 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
ab841160 OW |
233 | rets = -EFAULT; |
234 | goto free; | |
235 | } | |
236 | ||
237 | rets = length; | |
238 | *offset += length; | |
f862b6b2 TW |
239 | /* not all data was read, keep the cb */ |
240 | if (*offset < cb->buf_idx) | |
ab841160 OW |
241 | goto out; |
242 | ||
243 | free: | |
601a1efa | 244 | mei_io_cb_free(cb); |
8b2458f4 | 245 | *offset = 0; |
928fa666 | 246 | |
ab841160 | 247 | out: |
292f82c8 | 248 | cl_dbg(dev, cl, "end mei read rets = %d\n", rets); |
ab841160 OW |
249 | mutex_unlock(&dev->device_lock); |
250 | return rets; | |
251 | } | |
ab841160 OW |
252 | /** |
253 | * mei_write - the write function. | |
254 | * | |
255 | * @file: pointer to file structure | |
256 | * @ubuf: pointer to user buffer | |
257 | * @length: buffer length | |
258 | * @offset: data offset in buffer | |
259 | * | |
a8605ea2 | 260 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
261 | */ |
262 | static ssize_t mei_write(struct file *file, const char __user *ubuf, | |
441ab50f | 263 | size_t length, loff_t *offset) |
ab841160 OW |
264 | { |
265 | struct mei_cl *cl = file->private_data; | |
6cbb097f | 266 | struct mei_cl_cb *cb; |
ab841160 | 267 | struct mei_device *dev; |
ab841160 | 268 | int rets; |
ab841160 OW |
269 | |
270 | if (WARN_ON(!cl || !cl->dev)) | |
271 | return -ENODEV; | |
272 | ||
273 | dev = cl->dev; | |
274 | ||
275 | mutex_lock(&dev->device_lock); | |
276 | ||
b210d750 | 277 | if (dev->dev_state != MEI_DEV_ENABLED) { |
75f0ee15 | 278 | rets = -ENODEV; |
4234a6de | 279 | goto out; |
ab841160 OW |
280 | } |
281 | ||
d49ed64a AU |
282 | if (!mei_cl_is_connected(cl)) { |
283 | cl_err(dev, cl, "is not connected"); | |
284 | rets = -ENODEV; | |
4234a6de | 285 | goto out; |
75f0ee15 | 286 | } |
dd5de1f1 | 287 | |
d49ed64a AU |
288 | if (!mei_me_cl_is_active(cl->me_cl)) { |
289 | rets = -ENOTTY; | |
dd5de1f1 TW |
290 | goto out; |
291 | } | |
292 | ||
d49ed64a | 293 | if (length > mei_cl_mtu(cl)) { |
dd5de1f1 | 294 | rets = -EFBIG; |
4234a6de | 295 | goto out; |
75f0ee15 TW |
296 | } |
297 | ||
d49ed64a AU |
298 | if (length == 0) { |
299 | rets = 0; | |
4234a6de | 300 | goto out; |
75f0ee15 | 301 | } |
d49ed64a | 302 | |
a9bed610 | 303 | *offset = 0; |
6cbb097f AU |
304 | cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file); |
305 | if (!cb) { | |
33d28c92 | 306 | rets = -ENOMEM; |
4234a6de | 307 | goto out; |
ab841160 | 308 | } |
ab841160 | 309 | |
6cbb097f | 310 | rets = copy_from_user(cb->buf.data, ubuf, length); |
d8b29efa | 311 | if (rets) { |
2bf94cab | 312 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
d8b29efa | 313 | rets = -EFAULT; |
6cbb097f | 314 | mei_io_cb_free(cb); |
4234a6de | 315 | goto out; |
d8b29efa | 316 | } |
ab841160 | 317 | |
ab841160 | 318 | if (cl == &dev->iamthif_cl) { |
6cbb097f AU |
319 | rets = mei_amthif_write(cl, cb); |
320 | if (!rets) | |
321 | rets = length; | |
322 | goto out; | |
ab841160 OW |
323 | } |
324 | ||
e0cb6b2f | 325 | rets = mei_cl_write(cl, cb); |
b0d0cf77 | 326 | out: |
ab841160 | 327 | mutex_unlock(&dev->device_lock); |
ab841160 OW |
328 | return rets; |
329 | } | |
330 | ||
9f81abda TW |
331 | /** |
332 | * mei_ioctl_connect_client - the connect to fw client IOCTL function | |
333 | * | |
9f81abda | 334 | * @file: private data of the file object |
a8605ea2 | 335 | * @data: IOCTL connect data, input and output parameters |
9f81abda TW |
336 | * |
337 | * Locking: called under "dev->device_lock" lock | |
338 | * | |
a8605ea2 | 339 | * Return: 0 on success, <0 on failure. |
9f81abda TW |
340 | */ |
341 | static int mei_ioctl_connect_client(struct file *file, | |
342 | struct mei_connect_client_data *data) | |
343 | { | |
344 | struct mei_device *dev; | |
345 | struct mei_client *client; | |
d320832f | 346 | struct mei_me_client *me_cl; |
9f81abda | 347 | struct mei_cl *cl; |
9f81abda TW |
348 | int rets; |
349 | ||
350 | cl = file->private_data; | |
9f81abda TW |
351 | dev = cl->dev; |
352 | ||
79563db9 TW |
353 | if (dev->dev_state != MEI_DEV_ENABLED) |
354 | return -ENODEV; | |
9f81abda TW |
355 | |
356 | if (cl->state != MEI_FILE_INITIALIZING && | |
79563db9 TW |
357 | cl->state != MEI_FILE_DISCONNECTED) |
358 | return -EBUSY; | |
9f81abda TW |
359 | |
360 | /* find ME client we're trying to connect to */ | |
d320832f | 361 | me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid); |
f4e06246 | 362 | if (!me_cl) { |
2bf94cab | 363 | dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n", |
d49ed64a | 364 | &data->in_client_uuid); |
f4e06246 AU |
365 | rets = -ENOTTY; |
366 | goto end; | |
367 | } | |
368 | ||
369 | if (me_cl->props.fixed_address) { | |
370 | bool forbidden = dev->override_fixed_address ? | |
371 | !dev->allow_fixed_address : !dev->hbm_f_fa_supported; | |
372 | if (forbidden) { | |
373 | dev_dbg(dev->dev, "Connection forbidden to FW Client UUID = %pUl\n", | |
374 | &data->in_client_uuid); | |
375 | rets = -ENOTTY; | |
376 | goto end; | |
377 | } | |
9f81abda TW |
378 | } |
379 | ||
2bf94cab | 380 | dev_dbg(dev->dev, "Connect to FW Client ID = %d\n", |
d49ed64a | 381 | me_cl->client_id); |
2bf94cab | 382 | dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n", |
d320832f | 383 | me_cl->props.protocol_version); |
2bf94cab | 384 | dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n", |
d320832f | 385 | me_cl->props.max_msg_length); |
9f81abda | 386 | |
1a1aca42 | 387 | /* if we're connecting to amthif client then we will use the |
9f81abda TW |
388 | * existing connection |
389 | */ | |
1a1aca42 | 390 | if (uuid_le_cmp(data->in_client_uuid, mei_amthif_guid) == 0) { |
2bf94cab | 391 | dev_dbg(dev->dev, "FW Client is amthi\n"); |
f3de9b63 | 392 | if (!mei_cl_is_connected(&dev->iamthif_cl)) { |
9f81abda TW |
393 | rets = -ENODEV; |
394 | goto end; | |
395 | } | |
9f81abda TW |
396 | mei_cl_unlink(cl); |
397 | ||
398 | kfree(cl); | |
399 | cl = NULL; | |
22f96a0e | 400 | dev->iamthif_open_count++; |
9f81abda TW |
401 | file->private_data = &dev->iamthif_cl; |
402 | ||
403 | client = &data->out_client_properties; | |
d320832f TW |
404 | client->max_msg_length = me_cl->props.max_msg_length; |
405 | client->protocol_version = me_cl->props.protocol_version; | |
9f81abda TW |
406 | rets = dev->iamthif_cl.status; |
407 | ||
408 | goto end; | |
409 | } | |
410 | ||
9f81abda TW |
411 | /* prepare the output buffer */ |
412 | client = &data->out_client_properties; | |
d320832f TW |
413 | client->max_msg_length = me_cl->props.max_msg_length; |
414 | client->protocol_version = me_cl->props.protocol_version; | |
2bf94cab | 415 | dev_dbg(dev->dev, "Can connect?\n"); |
9f81abda | 416 | |
d49ed64a | 417 | rets = mei_cl_connect(cl, me_cl, file); |
9f81abda TW |
418 | |
419 | end: | |
79563db9 | 420 | mei_me_cl_put(me_cl); |
9f81abda TW |
421 | return rets; |
422 | } | |
423 | ||
3c7c8468 TW |
424 | /** |
425 | * mei_ioctl_client_notify_request - | |
426 | * propagate event notification request to client | |
427 | * | |
428 | * @file: pointer to file structure | |
429 | * @request: 0 - disable, 1 - enable | |
430 | * | |
431 | * Return: 0 on success , <0 on error | |
432 | */ | |
f23e2cc4 | 433 | static int mei_ioctl_client_notify_request(const struct file *file, u32 request) |
3c7c8468 TW |
434 | { |
435 | struct mei_cl *cl = file->private_data; | |
436 | ||
7326fffb AU |
437 | if (request != MEI_HBM_NOTIFICATION_START && |
438 | request != MEI_HBM_NOTIFICATION_STOP) | |
439 | return -EINVAL; | |
440 | ||
441 | return mei_cl_notify_request(cl, file, (u8)request); | |
3c7c8468 TW |
442 | } |
443 | ||
444 | /** | |
445 | * mei_ioctl_client_notify_get - wait for notification request | |
446 | * | |
447 | * @file: pointer to file structure | |
448 | * @notify_get: 0 - disable, 1 - enable | |
449 | * | |
450 | * Return: 0 on success , <0 on error | |
451 | */ | |
f23e2cc4 | 452 | static int mei_ioctl_client_notify_get(const struct file *file, u32 *notify_get) |
3c7c8468 TW |
453 | { |
454 | struct mei_cl *cl = file->private_data; | |
455 | bool notify_ev; | |
456 | bool block = (file->f_flags & O_NONBLOCK) == 0; | |
457 | int rets; | |
458 | ||
459 | rets = mei_cl_notify_get(cl, block, ¬ify_ev); | |
460 | if (rets) | |
461 | return rets; | |
462 | ||
463 | *notify_get = notify_ev ? 1 : 0; | |
464 | return 0; | |
465 | } | |
466 | ||
ab841160 OW |
467 | /** |
468 | * mei_ioctl - the IOCTL function | |
469 | * | |
470 | * @file: pointer to file structure | |
471 | * @cmd: ioctl command | |
472 | * @data: pointer to mei message structure | |
473 | * | |
a8605ea2 | 474 | * Return: 0 on success , <0 on error |
ab841160 OW |
475 | */ |
476 | static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data) | |
477 | { | |
478 | struct mei_device *dev; | |
479 | struct mei_cl *cl = file->private_data; | |
154eb18f | 480 | struct mei_connect_client_data connect_data; |
3c7c8468 | 481 | u32 notify_get, notify_req; |
ab841160 OW |
482 | int rets; |
483 | ||
ab841160 OW |
484 | |
485 | if (WARN_ON(!cl || !cl->dev)) | |
486 | return -ENODEV; | |
487 | ||
488 | dev = cl->dev; | |
489 | ||
2bf94cab | 490 | dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd); |
ab841160 OW |
491 | |
492 | mutex_lock(&dev->device_lock); | |
b210d750 | 493 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
494 | rets = -ENODEV; |
495 | goto out; | |
496 | } | |
497 | ||
4f046e7b TW |
498 | switch (cmd) { |
499 | case IOCTL_MEI_CONNECT_CLIENT: | |
2bf94cab | 500 | dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n"); |
154eb18f | 501 | if (copy_from_user(&connect_data, (char __user *)data, |
4f046e7b | 502 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 503 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
4f046e7b TW |
504 | rets = -EFAULT; |
505 | goto out; | |
506 | } | |
ab841160 | 507 | |
154eb18f | 508 | rets = mei_ioctl_connect_client(file, &connect_data); |
4f046e7b TW |
509 | if (rets) |
510 | goto out; | |
ab841160 | 511 | |
4f046e7b | 512 | /* if all is ok, copying the data back to user. */ |
154eb18f | 513 | if (copy_to_user((char __user *)data, &connect_data, |
ab841160 | 514 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 515 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
4f046e7b TW |
516 | rets = -EFAULT; |
517 | goto out; | |
518 | } | |
519 | ||
520 | break; | |
154eb18f | 521 | |
3c7c8468 TW |
522 | case IOCTL_MEI_NOTIFY_SET: |
523 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_SET.\n"); | |
524 | if (copy_from_user(¬ify_req, | |
525 | (char __user *)data, sizeof(notify_req))) { | |
526 | dev_dbg(dev->dev, "failed to copy data from userland\n"); | |
527 | rets = -EFAULT; | |
528 | goto out; | |
529 | } | |
530 | rets = mei_ioctl_client_notify_request(file, notify_req); | |
531 | break; | |
532 | ||
533 | case IOCTL_MEI_NOTIFY_GET: | |
534 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_GET.\n"); | |
535 | rets = mei_ioctl_client_notify_get(file, ¬ify_get); | |
536 | if (rets) | |
537 | goto out; | |
538 | ||
539 | dev_dbg(dev->dev, "copy connect data to user\n"); | |
540 | if (copy_to_user((char __user *)data, | |
541 | ¬ify_get, sizeof(notify_get))) { | |
542 | dev_dbg(dev->dev, "failed to copy data to userland\n"); | |
543 | rets = -EFAULT; | |
544 | goto out; | |
545 | ||
546 | } | |
547 | break; | |
548 | ||
4f046e7b | 549 | default: |
2bf94cab | 550 | dev_err(dev->dev, ": unsupported ioctl %d.\n", cmd); |
4f046e7b | 551 | rets = -ENOIOCTLCMD; |
ab841160 OW |
552 | } |
553 | ||
554 | out: | |
ab841160 OW |
555 | mutex_unlock(&dev->device_lock); |
556 | return rets; | |
557 | } | |
558 | ||
559 | /** | |
560 | * mei_compat_ioctl - the compat IOCTL function | |
561 | * | |
562 | * @file: pointer to file structure | |
563 | * @cmd: ioctl command | |
564 | * @data: pointer to mei message structure | |
565 | * | |
a8605ea2 | 566 | * Return: 0 on success , <0 on error |
ab841160 OW |
567 | */ |
568 | #ifdef CONFIG_COMPAT | |
569 | static long mei_compat_ioctl(struct file *file, | |
441ab50f | 570 | unsigned int cmd, unsigned long data) |
ab841160 OW |
571 | { |
572 | return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data)); | |
573 | } | |
574 | #endif | |
575 | ||
576 | ||
577 | /** | |
578 | * mei_poll - the poll function | |
579 | * | |
580 | * @file: pointer to file structure | |
581 | * @wait: pointer to poll_table structure | |
582 | * | |
a8605ea2 | 583 | * Return: poll mask |
ab841160 OW |
584 | */ |
585 | static unsigned int mei_poll(struct file *file, poll_table *wait) | |
586 | { | |
1d9013f0 | 587 | unsigned long req_events = poll_requested_events(wait); |
ab841160 OW |
588 | struct mei_cl *cl = file->private_data; |
589 | struct mei_device *dev; | |
590 | unsigned int mask = 0; | |
2c84c297 | 591 | bool notify_en; |
ab841160 OW |
592 | |
593 | if (WARN_ON(!cl || !cl->dev)) | |
b950ac1d | 594 | return POLLERR; |
ab841160 OW |
595 | |
596 | dev = cl->dev; | |
597 | ||
598 | mutex_lock(&dev->device_lock); | |
599 | ||
2c84c297 | 600 | notify_en = cl->notify_en && (req_events & POLLPRI); |
f3de9b63 TW |
601 | |
602 | if (dev->dev_state != MEI_DEV_ENABLED || | |
603 | !mei_cl_is_connected(cl)) { | |
b950ac1d | 604 | mask = POLLERR; |
ab841160 OW |
605 | goto out; |
606 | } | |
607 | ||
2c84c297 TW |
608 | if (notify_en) { |
609 | poll_wait(file, &cl->ev_wait, wait); | |
610 | if (cl->notify_ev) | |
611 | mask |= POLLPRI; | |
612 | } | |
9fa0be8b AU |
613 | |
614 | if (cl == &dev->iamthif_cl) { | |
615 | mask |= mei_amthif_poll(file, wait); | |
616 | goto out; | |
617 | } | |
2c84c297 | 618 | |
1d9013f0 TW |
619 | if (req_events & (POLLIN | POLLRDNORM)) { |
620 | poll_wait(file, &cl->rx_wait, wait); | |
621 | ||
622 | if (!list_empty(&cl->rd_completed)) | |
623 | mask |= POLLIN | POLLRDNORM; | |
624 | else | |
3030dc05 | 625 | mei_cl_read_start(cl, mei_cl_mtu(cl), file); |
1d9013f0 | 626 | } |
ab841160 OW |
627 | |
628 | out: | |
629 | mutex_unlock(&dev->device_lock); | |
630 | return mask; | |
631 | } | |
632 | ||
237092bf TW |
633 | /** |
634 | * mei_fasync - asynchronous io support | |
635 | * | |
636 | * @fd: file descriptor | |
637 | * @file: pointer to file structure | |
638 | * @band: band bitmap | |
639 | * | |
ed6dc538 TW |
640 | * Return: negative on error, |
641 | * 0 if it did no changes, | |
642 | * and positive a process was added or deleted | |
237092bf TW |
643 | */ |
644 | static int mei_fasync(int fd, struct file *file, int band) | |
645 | { | |
646 | ||
647 | struct mei_cl *cl = file->private_data; | |
648 | ||
649 | if (!mei_cl_is_connected(cl)) | |
ed6dc538 | 650 | return -ENODEV; |
237092bf TW |
651 | |
652 | return fasync_helper(fd, file, band, &cl->ev_async); | |
653 | } | |
654 | ||
55c4e640 | 655 | /** |
88d1bece | 656 | * fw_status_show - mei device fw_status attribute show method |
55c4e640 TW |
657 | * |
658 | * @device: device pointer | |
659 | * @attr: attribute pointer | |
660 | * @buf: char out buffer | |
661 | * | |
662 | * Return: number of the bytes printed into buf or error | |
663 | */ | |
664 | static ssize_t fw_status_show(struct device *device, | |
665 | struct device_attribute *attr, char *buf) | |
666 | { | |
667 | struct mei_device *dev = dev_get_drvdata(device); | |
668 | struct mei_fw_status fw_status; | |
669 | int err, i; | |
670 | ssize_t cnt = 0; | |
671 | ||
672 | mutex_lock(&dev->device_lock); | |
673 | err = mei_fw_status(dev, &fw_status); | |
674 | mutex_unlock(&dev->device_lock); | |
675 | if (err) { | |
676 | dev_err(device, "read fw_status error = %d\n", err); | |
677 | return err; | |
678 | } | |
679 | ||
680 | for (i = 0; i < fw_status.count; i++) | |
681 | cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n", | |
682 | fw_status.status[i]); | |
683 | return cnt; | |
684 | } | |
685 | static DEVICE_ATTR_RO(fw_status); | |
686 | ||
88d1bece AU |
687 | /** |
688 | * hbm_ver_show - display HBM protocol version negotiated with FW | |
689 | * | |
690 | * @device: device pointer | |
691 | * @attr: attribute pointer | |
692 | * @buf: char out buffer | |
693 | * | |
694 | * Return: number of the bytes printed into buf or error | |
695 | */ | |
696 | static ssize_t hbm_ver_show(struct device *device, | |
697 | struct device_attribute *attr, char *buf) | |
698 | { | |
699 | struct mei_device *dev = dev_get_drvdata(device); | |
700 | struct hbm_version ver; | |
701 | ||
702 | mutex_lock(&dev->device_lock); | |
703 | ver = dev->version; | |
704 | mutex_unlock(&dev->device_lock); | |
705 | ||
706 | return sprintf(buf, "%u.%u\n", ver.major_version, ver.minor_version); | |
707 | } | |
708 | static DEVICE_ATTR_RO(hbm_ver); | |
709 | ||
710 | /** | |
711 | * hbm_ver_drv_show - display HBM protocol version advertised by driver | |
712 | * | |
713 | * @device: device pointer | |
714 | * @attr: attribute pointer | |
715 | * @buf: char out buffer | |
716 | * | |
717 | * Return: number of the bytes printed into buf or error | |
718 | */ | |
719 | static ssize_t hbm_ver_drv_show(struct device *device, | |
720 | struct device_attribute *attr, char *buf) | |
721 | { | |
722 | return sprintf(buf, "%u.%u\n", HBM_MAJOR_VERSION, HBM_MINOR_VERSION); | |
723 | } | |
724 | static DEVICE_ATTR_RO(hbm_ver_drv); | |
725 | ||
55c4e640 TW |
726 | static struct attribute *mei_attrs[] = { |
727 | &dev_attr_fw_status.attr, | |
88d1bece AU |
728 | &dev_attr_hbm_ver.attr, |
729 | &dev_attr_hbm_ver_drv.attr, | |
55c4e640 TW |
730 | NULL |
731 | }; | |
732 | ATTRIBUTE_GROUPS(mei); | |
733 | ||
5b881e3c OW |
734 | /* |
735 | * file operations structure will be used for mei char device. | |
736 | */ | |
737 | static const struct file_operations mei_fops = { | |
738 | .owner = THIS_MODULE, | |
739 | .read = mei_read, | |
740 | .unlocked_ioctl = mei_ioctl, | |
741 | #ifdef CONFIG_COMPAT | |
742 | .compat_ioctl = mei_compat_ioctl, | |
743 | #endif | |
744 | .open = mei_open, | |
745 | .release = mei_release, | |
746 | .write = mei_write, | |
747 | .poll = mei_poll, | |
237092bf | 748 | .fasync = mei_fasync, |
5b881e3c OW |
749 | .llseek = no_llseek |
750 | }; | |
751 | ||
f3d8e878 AU |
752 | static struct class *mei_class; |
753 | static dev_t mei_devt; | |
754 | #define MEI_MAX_DEVS MINORMASK | |
755 | static DEFINE_MUTEX(mei_minor_lock); | |
756 | static DEFINE_IDR(mei_idr); | |
757 | ||
758 | /** | |
759 | * mei_minor_get - obtain next free device minor number | |
760 | * | |
761 | * @dev: device pointer | |
762 | * | |
a8605ea2 | 763 | * Return: allocated minor, or -ENOSPC if no free minor left |
5b881e3c | 764 | */ |
f3d8e878 AU |
765 | static int mei_minor_get(struct mei_device *dev) |
766 | { | |
767 | int ret; | |
768 | ||
769 | mutex_lock(&mei_minor_lock); | |
770 | ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL); | |
771 | if (ret >= 0) | |
772 | dev->minor = ret; | |
773 | else if (ret == -ENOSPC) | |
2bf94cab | 774 | dev_err(dev->dev, "too many mei devices\n"); |
5b881e3c | 775 | |
f3d8e878 AU |
776 | mutex_unlock(&mei_minor_lock); |
777 | return ret; | |
778 | } | |
30e53bb8 | 779 | |
f3d8e878 AU |
780 | /** |
781 | * mei_minor_free - mark device minor number as free | |
782 | * | |
783 | * @dev: device pointer | |
784 | */ | |
785 | static void mei_minor_free(struct mei_device *dev) | |
9a123f19 | 786 | { |
f3d8e878 AU |
787 | mutex_lock(&mei_minor_lock); |
788 | idr_remove(&mei_idr, dev->minor); | |
789 | mutex_unlock(&mei_minor_lock); | |
790 | } | |
791 | ||
792 | int mei_register(struct mei_device *dev, struct device *parent) | |
793 | { | |
794 | struct device *clsdev; /* class device */ | |
795 | int ret, devno; | |
796 | ||
797 | ret = mei_minor_get(dev); | |
798 | if (ret < 0) | |
30e53bb8 TW |
799 | return ret; |
800 | ||
f3d8e878 AU |
801 | /* Fill in the data structures */ |
802 | devno = MKDEV(MAJOR(mei_devt), dev->minor); | |
803 | cdev_init(&dev->cdev, &mei_fops); | |
154322f4 | 804 | dev->cdev.owner = parent->driver->owner; |
f3d8e878 AU |
805 | |
806 | /* Add the device */ | |
807 | ret = cdev_add(&dev->cdev, devno, 1); | |
808 | if (ret) { | |
809 | dev_err(parent, "unable to add device %d:%d\n", | |
810 | MAJOR(mei_devt), dev->minor); | |
811 | goto err_dev_add; | |
812 | } | |
813 | ||
55c4e640 TW |
814 | clsdev = device_create_with_groups(mei_class, parent, devno, |
815 | dev, mei_groups, | |
816 | "mei%d", dev->minor); | |
f3d8e878 AU |
817 | |
818 | if (IS_ERR(clsdev)) { | |
819 | dev_err(parent, "unable to create device %d:%d\n", | |
820 | MAJOR(mei_devt), dev->minor); | |
821 | ret = PTR_ERR(clsdev); | |
822 | goto err_dev_create; | |
823 | } | |
824 | ||
825 | ret = mei_dbgfs_register(dev, dev_name(clsdev)); | |
826 | if (ret) { | |
827 | dev_err(clsdev, "cannot register debugfs ret = %d\n", ret); | |
828 | goto err_dev_dbgfs; | |
829 | } | |
30e53bb8 TW |
830 | |
831 | return 0; | |
f3d8e878 AU |
832 | |
833 | err_dev_dbgfs: | |
834 | device_destroy(mei_class, devno); | |
835 | err_dev_create: | |
836 | cdev_del(&dev->cdev); | |
837 | err_dev_add: | |
838 | mei_minor_free(dev); | |
839 | return ret; | |
5b881e3c | 840 | } |
40e0b67b | 841 | EXPORT_SYMBOL_GPL(mei_register); |
5b881e3c | 842 | |
30e53bb8 | 843 | void mei_deregister(struct mei_device *dev) |
5b881e3c | 844 | { |
f3d8e878 AU |
845 | int devno; |
846 | ||
847 | devno = dev->cdev.dev; | |
848 | cdev_del(&dev->cdev); | |
849 | ||
30e53bb8 | 850 | mei_dbgfs_deregister(dev); |
f3d8e878 AU |
851 | |
852 | device_destroy(mei_class, devno); | |
853 | ||
854 | mei_minor_free(dev); | |
5b881e3c | 855 | } |
40e0b67b | 856 | EXPORT_SYMBOL_GPL(mei_deregister); |
ab841160 | 857 | |
cf3baefb SO |
858 | static int __init mei_init(void) |
859 | { | |
f3d8e878 AU |
860 | int ret; |
861 | ||
862 | mei_class = class_create(THIS_MODULE, "mei"); | |
863 | if (IS_ERR(mei_class)) { | |
864 | pr_err("couldn't create class\n"); | |
865 | ret = PTR_ERR(mei_class); | |
866 | goto err; | |
867 | } | |
868 | ||
869 | ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei"); | |
870 | if (ret < 0) { | |
871 | pr_err("unable to allocate char dev region\n"); | |
872 | goto err_class; | |
873 | } | |
874 | ||
875 | ret = mei_cl_bus_init(); | |
876 | if (ret < 0) { | |
877 | pr_err("unable to initialize bus\n"); | |
878 | goto err_chrdev; | |
879 | } | |
880 | ||
881 | return 0; | |
882 | ||
883 | err_chrdev: | |
884 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); | |
885 | err_class: | |
886 | class_destroy(mei_class); | |
887 | err: | |
888 | return ret; | |
cf3baefb SO |
889 | } |
890 | ||
891 | static void __exit mei_exit(void) | |
892 | { | |
f3d8e878 AU |
893 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); |
894 | class_destroy(mei_class); | |
cf3baefb SO |
895 | mei_cl_bus_exit(); |
896 | } | |
897 | ||
898 | module_init(mei_init); | |
899 | module_exit(mei_exit); | |
900 | ||
40e0b67b TW |
901 | MODULE_AUTHOR("Intel Corporation"); |
902 | MODULE_DESCRIPTION("Intel(R) Management Engine Interface"); | |
827eef51 | 903 | MODULE_LICENSE("GPL v2"); |
ab841160 | 904 |