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Staging: heci: fix softirq safe to unsafe spinlock issue
[linux-2.6/btrfs-unstable.git] / drivers / staging / heci / io_heci.c
blob0d7f31bed566ffa5fe827bd21f7a8e3102a867e0
1 /*
2 * Part of Intel(R) Manageability Engine Interface Linux driver
3 *
4 * Copyright (c) 2003 - 2008 Intel Corp.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions, and the following disclaimer,
12 * without modification.
13 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
14 * substantially similar to the "NO WARRANTY" disclaimer below
15 * ("Disclaimer") and any redistribution must be conditioned upon
16 * including a substantially similar Disclaimer requirement for further
17 * binary redistribution.
18 * 3. Neither the names of the above-listed copyright holders nor the names
19 * of any contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * Alternatively, this software may be distributed under the terms of the
23 * GNU General Public License ("GPL") version 2 as published by the Free
24 * Software Foundation.
25 *
26 * NO WARRANTY
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
35 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
36 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGES.
38 *
39 */
40
41 #include <linux/module.h>
42 #include <linux/moduleparam.h>
43 #include <linux/kernel.h>
44 #include <linux/slab.h>
45 #include <linux/fs.h>
46 #include <linux/errno.h>
47 #include <linux/types.h>
48 #include <linux/fcntl.h>
49 #include <linux/aio.h>
50 #include <linux/pci.h>
51 #include <linux/reboot.h>
52 #include <linux/poll.h>
53 #include <linux/init.h>
54 #include <linux/kdev_t.h>
55 #include <linux/ioctl.h>
56 #include <linux/cdev.h>
57 #include <linux/list.h>
58 #include <linux/unistd.h>
59 #include <linux/delay.h>
60
61 #include "heci_data_structures.h"
62 #include "heci.h"
63 #include "heci_interface.h"
64 #include "heci_version.h"
65
66
67 /**
68 * heci_ioctl_get_version - the get driver version IOCTL function
69 *
70 * @dev: Device object for our driver
71 * @if_num: minor number
72 * @*u_msg: pointer to user data struct in user space
73 * @k_msg: data in kernel on the stack
74 * @file_ext: private data of the file object
75 *
76 * returns 0 on success, <0 on failure.
77 */
78 int heci_ioctl_get_version(struct iamt_heci_device *dev, int if_num,
79 struct heci_message_data __user *u_msg,
80 struct heci_message_data k_msg,
81 struct heci_file_private *file_ext)
82 {
83 int rets = 0;
84 struct heci_driver_version *version;
85 struct heci_message_data res_msg;
86
87 if ((if_num != HECI_MINOR_NUMBER) || (!dev)
88 || (!file_ext))
89 return -ENODEV;
90
91 if (k_msg.size < (sizeof(struct heci_driver_version) - 2)) {
92 DBG("user buffer less than heci_driver_version.\n");
93 return -EMSGSIZE;
94 }
95
96 res_msg.data = kmalloc(sizeof(struct heci_driver_version), GFP_KERNEL);
97 if (!res_msg.data) {
98 DBG("failed allocation response buffer size = %d.\n",
99 (int) sizeof(struct heci_driver_version));
100 return -ENOMEM;
101 }
102
103 version = (struct heci_driver_version *) res_msg.data;
104 version->major = MAJOR_VERSION;
105 version->minor = MINOR_VERSION;
106 version->hotfix = QUICK_FIX_NUMBER;
107 version->build = VER_BUILD;
108 res_msg.size = sizeof(struct heci_driver_version);
109 if (k_msg.size < sizeof(struct heci_driver_version))
110 res_msg.size -= 2;
111
112 rets = file_ext->status;
113 /* now copy the data to user space */
114 if (copy_to_user((void __user *)k_msg.data, res_msg.data, res_msg.size)) {
115 rets = -EFAULT;
116 goto end;
117 }
118 if (put_user(res_msg.size, &u_msg->size)) {
119 rets = -EFAULT;
120 goto end;
121 }
122 end:
123 kfree(res_msg.data);
124 return rets;
125 }
126
127 /**
128 * heci_ioctl_connect_client - the connect to fw client IOCTL function
129 *
130 * @dev: Device object for our driver
131 * @if_num: minor number
132 * @*u_msg: pointer to user data struct in user space
133 * @k_msg: data in kernel on the stack
134 * @file_ext: private data of the file object
135 *
136 * returns 0 on success, <0 on failure.
137 */
138 int heci_ioctl_connect_client(struct iamt_heci_device *dev, int if_num,
139 struct heci_message_data __user *u_msg,
140 struct heci_message_data k_msg,
141 struct file *file)
142 {
143 int rets = 0;
144 struct heci_message_data req_msg, res_msg;
145 struct heci_cb_private *priv_cb = NULL;
146 struct heci_client *client;
147 struct heci_file_private *file_ext;
148 struct heci_file_private *file_pos = NULL;
149 struct heci_file_private *file_next = NULL;
150 long timeout = 15; /*15 second */
151 __u8 i;
152 int err = 0;
153
154 if ((if_num != HECI_MINOR_NUMBER) || (!dev) || (!file))
155 return -ENODEV;
156
157 file_ext = file->private_data;
158 if (!file_ext)
159 return -ENODEV;
160
161 if (k_msg.size != sizeof(struct guid)) {
162 DBG("user buffer size is not equal to size of struct "
163 "guid(16).\n");
164 return -EMSGSIZE;
165 }
166
167 if (!k_msg.data)
168 return -EIO;
169
170 req_msg.data = kmalloc(sizeof(struct guid), GFP_KERNEL);
171 res_msg.data = kmalloc(sizeof(struct heci_client), GFP_KERNEL);
172
173 if (!res_msg.data) {
174 DBG("failed allocation response buffer size = %d.\n",
175 (int) sizeof(struct heci_client));
176 kfree(req_msg.data);
177 return -ENOMEM;
178 }
179 if (!req_msg.data) {
180 DBG("failed allocation request buffer size = %d.\n",
181 (int) sizeof(struct guid));
182 kfree(res_msg.data);
183 return -ENOMEM;
184 }
185 req_msg.size = sizeof(struct guid);
186 res_msg.size = sizeof(struct heci_client);
187
188 /* copy the message to kernel space -
189 * use a pointer already copied into kernel space
190 */
191 if (copy_from_user(req_msg.data, (void __user *)k_msg.data, k_msg.size)) {
192 rets = -EFAULT;
193 goto end;
194 }
195 /* buffered ioctl cb */
196 priv_cb = kzalloc(sizeof(struct heci_cb_private), GFP_KERNEL);
197 if (!priv_cb) {
198 rets = -ENOMEM;
199 goto end;
200 }
201 INIT_LIST_HEAD(&priv_cb->cb_list);
202 priv_cb->response_buffer.data = res_msg.data;
203 priv_cb->response_buffer.size = res_msg.size;
204 priv_cb->request_buffer.data = req_msg.data;
205 priv_cb->request_buffer.size = req_msg.size;
206 priv_cb->major_file_operations = HECI_IOCTL;
207 spin_lock_bh(&dev->device_lock);
208 if (dev->heci_state != HECI_ENABLED) {
209 rets = -ENODEV;
210 spin_unlock_bh(&dev->device_lock);
211 goto end;
212 }
213 if ((file_ext->state != HECI_FILE_INITIALIZING) &&
214 (file_ext->state != HECI_FILE_DISCONNECTED)) {
215 rets = -EBUSY;
216 spin_unlock_bh(&dev->device_lock);
217 goto end;
218 }
219
220 /* find ME client we're trying to connect to */
221 for (i = 0; i < dev->num_heci_me_clients; i++) {
222 if (memcmp((struct guid *)req_msg.data,
223 &dev->me_clients[i].props.protocol_name,
224 sizeof(struct guid)) == 0) {
225 if (dev->me_clients[i].props.fixed_address == 0) {
226 file_ext->me_client_id =
227 dev->me_clients[i].client_id;
228 file_ext->state = HECI_FILE_CONNECTING;
229 }
230 break;
231 }
232 }
233 /* if we're connecting to PTHI client so we will use the exist
234 * connection
235 */
236 if (memcmp((struct guid *)req_msg.data, &heci_pthi_guid,
237 sizeof(struct guid)) == 0) {
238 if (dev->iamthif_file_ext.state != HECI_FILE_CONNECTED) {
239 rets = -ENODEV;
240 spin_unlock_bh(&dev->device_lock);
241 goto end;
242 }
243 dev->heci_host_clients[file_ext->host_client_id / 8] &=
244 ~(1 << (file_ext->host_client_id % 8));
245 list_for_each_entry_safe(file_pos,
246 file_next, &dev->file_list, link) {
247 if (heci_fe_same_id(file_ext, file_pos)) {
248 DBG("remove file private data node host"
249 " client = %d, ME client = %d.\n",
250 file_pos->host_client_id,
251 file_pos->me_client_id);
252 list_del(&file_pos->link);
253 }
254
255 }
256 DBG("free file private data memory.\n");
257 kfree(file_ext);
258 file_ext = NULL;
259 file->private_data = &dev->iamthif_file_ext;
260 client = (struct heci_client *) res_msg.data;
261 client->max_msg_length =
262 dev->me_clients[i].props.max_msg_length;
263 client->protocol_version =
264 dev->me_clients[i].props.protocol_version;
265 rets = dev->iamthif_file_ext.status;
266 spin_unlock_bh(&dev->device_lock);
267
268 /* now copy the data to user space */
269 if (copy_to_user((void __user *)k_msg.data,
270 res_msg.data, res_msg.size)) {
271 rets = -EFAULT;
272 goto end;
273 }
274 if (put_user(res_msg.size, &u_msg->size)) {
275 rets = -EFAULT;
276 goto end;
277 }
278 goto end;
279 }
280 spin_unlock_bh(&dev->device_lock);
281
282 spin_lock(&file_ext->file_lock);
283 spin_lock_bh(&dev->device_lock);
284 if (file_ext->state != HECI_FILE_CONNECTING) {
285 rets = -ENODEV;
286 spin_unlock_bh(&dev->device_lock);
287 spin_unlock(&file_ext->file_lock);
288 goto end;
289 }
290 /* prepare the output buffer */
291 client = (struct heci_client *) res_msg.data;
292 client->max_msg_length = dev->me_clients[i].props.max_msg_length;
293 client->protocol_version = dev->me_clients[i].props.protocol_version;
294 if (dev->host_buffer_is_empty
295 && !other_client_is_connecting(dev, file_ext)) {
296 dev->host_buffer_is_empty = 0;
297 if (!heci_connect(dev, file_ext)) {
298 rets = -ENODEV;
299 spin_unlock_bh(&dev->device_lock);
300 goto end;
301 } else {
302 file_ext->timer_count = HECI_CONNECT_TIMEOUT;
303 priv_cb->file_private = file_ext;
304 list_add_tail(&priv_cb->cb_list,
305 &dev->ctrl_rd_list.heci_cb.
306 cb_list);
307 }
308
309
310 } else {
311 priv_cb->file_private = file_ext;
312 DBG("add connect cb to control write list.\n");
313 list_add_tail(&priv_cb->cb_list,
314 &dev->ctrl_wr_list.heci_cb.cb_list);
315 }
316 spin_unlock_bh(&dev->device_lock);
317 spin_unlock(&file_ext->file_lock);
318 err = wait_event_timeout(dev->wait_recvd_msg,
319 (HECI_FILE_CONNECTED == file_ext->state
320 || HECI_FILE_DISCONNECTED == file_ext->state),
321 timeout * HZ);
322
323 if (HECI_FILE_CONNECTED == file_ext->state) {
324 DBG("successfully connected to FW client.\n");
325 rets = file_ext->status;
326 /* now copy the data to user space */
327 if (copy_to_user((void __user *)k_msg.data,
328 res_msg.data, res_msg.size)) {
329 rets = -EFAULT;
330 goto end;
331 }
332 if (put_user(res_msg.size, &u_msg->size)) {
333 rets = -EFAULT;
334 goto end;
335 }
336 goto end;
337 } else {
338 DBG("failed to connect to FW client.file_ext->state = %d.\n",
339 file_ext->state);
340 if (!err) {
341 DBG("wait_event_interruptible_timeout failed on client"
342 " connect message fw response message.\n");
343 }
344 rets = -EFAULT;
345 goto remove_list;
346 }
347
348 remove_list:
349 if (priv_cb) {
350 spin_lock_bh(&dev->device_lock);
351 heci_flush_list(&dev->ctrl_rd_list, file_ext);
352 heci_flush_list(&dev->ctrl_wr_list, file_ext);
353 spin_unlock_bh(&dev->device_lock);
354 }
355 end:
356 DBG("free connect cb memory.");
357 kfree(req_msg.data);
358 kfree(res_msg.data);
359 kfree(priv_cb);
360 return rets;
361 }
362
363 /**
364 * heci_ioctl_wd - the wd IOCTL function
365 *
366 * @dev: Device object for our driver
367 * @if_num: minor number
368 * @k_msg: data in kernel on the stack
369 * @file_ext: private data of the file object
370 *
371 * returns 0 on success, <0 on failure.
372 */
373 int heci_ioctl_wd(struct iamt_heci_device *dev, int if_num,
374 struct heci_message_data k_msg,
375 struct heci_file_private *file_ext)
376 {
377 int rets = 0;
378 struct heci_message_data req_msg; /*in kernel on the stack */
379
380 if (if_num != HECI_MINOR_NUMBER)
381 return -ENODEV;
382
383 spin_lock(&file_ext->file_lock);
384 if (k_msg.size != HECI_WATCHDOG_DATA_SIZE) {
385 DBG("user buffer has invalid size.\n");
386 spin_unlock(&file_ext->file_lock);
387 return -EMSGSIZE;
388 }
389 spin_unlock(&file_ext->file_lock);
390
391 req_msg.data = kmalloc(HECI_WATCHDOG_DATA_SIZE, GFP_KERNEL);
392 if (!req_msg.data) {
393 DBG("failed allocation request buffer size = %d.\n",
394 HECI_WATCHDOG_DATA_SIZE);
395 return -ENOMEM;
396 }
397 req_msg.size = HECI_WATCHDOG_DATA_SIZE;
398
399 /* copy the message to kernel space - use a pointer already
400 * copied into kernel space
401 */
402 if (copy_from_user(req_msg.data,
403 (void __user *)k_msg.data, req_msg.size)) {
404 rets = -EFAULT;
405 goto end;
406 }
407 spin_lock_bh(&dev->device_lock);
408 if (dev->heci_state != HECI_ENABLED) {
409 rets = -ENODEV;
410 spin_unlock_bh(&dev->device_lock);
411 goto end;
412 }
413
414 if (dev->wd_file_ext.state != HECI_FILE_CONNECTED) {
415 rets = -ENODEV;
416 spin_unlock_bh(&dev->device_lock);
417 goto end;
418 }
419 if (!dev->asf_mode) {
420 rets = -EIO;
421 spin_unlock_bh(&dev->device_lock);
422 goto end;
423 }
424
425 memcpy(&dev->wd_data[HECI_WD_PARAMS_SIZE], req_msg.data,
426 HECI_WATCHDOG_DATA_SIZE);
427
428 dev->wd_timeout = (req_msg.data[1] << 8) + req_msg.data[0];
429 dev->wd_pending = 0;
430 dev->wd_due_counter = 1; /* next timer */
431 if (dev->wd_timeout == 0) {
432 memcpy(dev->wd_data, heci_stop_wd_params,
433 HECI_WD_PARAMS_SIZE);
434 } else {
435 memcpy(dev->wd_data, heci_start_wd_params,
436 HECI_WD_PARAMS_SIZE);
437 mod_timer(&dev->wd_timer, jiffies);
438 }
439 spin_unlock_bh(&dev->device_lock);
440 end:
441 kfree(req_msg.data);
442 return rets;
443 }
444
445
446 /**
447 * heci_ioctl_bypass_wd - the bypass_wd IOCTL function
448 *
449 * @dev: Device object for our driver
450 * @if_num: minor number
451 * @k_msg: data in kernel on the stack
452 * @file_ext: private data of the file object
453 *
454 * returns 0 on success, <0 on failure.
455 */
456 int heci_ioctl_bypass_wd(struct iamt_heci_device *dev, int if_num,
457 struct heci_message_data k_msg,
458 struct heci_file_private *file_ext)
459 {
460 __u8 flag = 0;
461 int rets = 0;
462
463 if (if_num != HECI_MINOR_NUMBER)
464 return -ENODEV;
465
466 spin_lock(&file_ext->file_lock);
467 if (k_msg.size < 1) {
468 DBG("user buffer less than HECI_WATCHDOG_DATA_SIZE.\n");
469 spin_unlock(&file_ext->file_lock);
470 return -EMSGSIZE;
471 }
472 spin_unlock(&file_ext->file_lock);
473 if (copy_from_user(&flag, (void __user *)k_msg.data, 1)) {
474 rets = -EFAULT;
475 goto end;
476 }
477
478 spin_lock_bh(&dev->device_lock);
479 flag = flag ? (1) : (0);
480 dev->wd_bypass = flag;
481 spin_unlock_bh(&dev->device_lock);
482 end:
483 return rets;
484 }
485
486 /**
487 * find_pthi_read_list_entry - finds a PTHIlist entry for current file
488 *
489 * @dev: Device object for our driver
490 * @file: pointer to file object
491 *
492 * returns returned a list entry on success, NULL on failure.
493 */
494 struct heci_cb_private *find_pthi_read_list_entry(
495 struct iamt_heci_device *dev,
496 struct file *file)
497 {
498 struct heci_file_private *file_ext_temp;
499 struct heci_cb_private *priv_cb_pos = NULL;
500 struct heci_cb_private *priv_cb_next = NULL;
501
502 if ((dev->pthi_read_complete_list.status == 0) &&
503 !list_empty(&dev->pthi_read_complete_list.heci_cb.cb_list)) {
504 list_for_each_entry_safe(priv_cb_pos, priv_cb_next,
505 &dev->pthi_read_complete_list.heci_cb.cb_list, cb_list) {
506 file_ext_temp = (struct heci_file_private *)
507 priv_cb_pos->file_private;
508 if ((file_ext_temp != NULL) &&
509 (file_ext_temp == &dev->iamthif_file_ext) &&
510 (priv_cb_pos->file_object == file))
511 return priv_cb_pos;
512 }
513 }
514 return NULL;
515 }
516
517 /**
518 * pthi_read - read data from pthi client
519 *
520 * @dev: Device object for our driver
521 * @if_num: minor number
522 * @file: pointer to file object
523 * @*ubuf: pointer to user data in user space
524 * @length: data length to read
525 * @offset: data read offset
526 *
527 * returns
528 * returned data length on success,
529 * zero if no data to read,
530 * negative on failure.
531 */
532 int pthi_read(struct iamt_heci_device *dev, int if_num, struct file *file,
533 char __user *ubuf, size_t length, loff_t *offset)
534 {
535 int rets = 0;
536 struct heci_cb_private *priv_cb = NULL;
537 struct heci_file_private *file_ext = file->private_data;
538 __u8 i;
539 unsigned long currtime = get_seconds();
540
541 if ((if_num != HECI_MINOR_NUMBER) || (!dev))
542 return -ENODEV;
543
544 if ((file_ext == NULL) || (file_ext != &dev->iamthif_file_ext))
545 return -ENODEV;
546
547 spin_lock_bh(&dev->device_lock);
548 for (i = 0; i < dev->num_heci_me_clients; i++) {
549 if (dev->me_clients[i].client_id ==
550 dev->iamthif_file_ext.me_client_id)
551 break;
552 }
553 BUG_ON(dev->me_clients[i].client_id != file_ext->me_client_id);
554 if ((i == dev->num_heci_me_clients)
555 || (dev->me_clients[i].client_id !=
556 dev->iamthif_file_ext.me_client_id)) {
557 DBG("PTHI client not found.\n");
558 spin_unlock_bh(&dev->device_lock);
559 return -ENODEV;
560 }
561 priv_cb = find_pthi_read_list_entry(dev, file);
562 if (!priv_cb) {
563 spin_unlock_bh(&dev->device_lock);
564 return 0; /* No more data to read */
565 } else {
566 if (priv_cb &&
567 (currtime - priv_cb->read_time > IAMTHIF_READ_TIMER)) {
568 /* 15 sec for the message has expired */
569 list_del(&priv_cb->cb_list);
570 spin_unlock_bh(&dev->device_lock);
571 rets = -ETIMEDOUT;
572 goto free;
573 }
574 /* if the whole message will fit remove it from the list */
575 if ((priv_cb->information >= *offset) &&
576 (length >= (priv_cb->information - *offset)))
577 list_del(&priv_cb->cb_list);
578 else if ((priv_cb->information > 0) &&
579 (priv_cb->information <= *offset)) {
580 /* end of the message has been reached */
581 list_del(&priv_cb->cb_list);
582 rets = 0;
583 spin_unlock_bh(&dev->device_lock);
584 goto free;
585 }
586 /* else means that not full buffer will be read and do not
587 * remove message from deletion list
588 */
589 }
590 DBG("pthi priv_cb->response_buffer size - %d\n",
591 priv_cb->response_buffer.size);
592 DBG("pthi priv_cb->information - %lu\n",
593 priv_cb->information);
594 spin_unlock_bh(&dev->device_lock);
595
596 /* length is being turncated to PAGE_SIZE, however,
597 * the information may be longer */
598 length = length < (priv_cb->information - *offset) ?
599 length : (priv_cb->information - *offset);
600
601 if (copy_to_user(ubuf,
602 priv_cb->response_buffer.data + *offset,
603 length))
604 rets = -EFAULT;
605 else {
606 rets = length;
607 if ((*offset + length) < priv_cb->information) {
608 *offset += length;
609 goto out;
610 }
611 }
612 free:
613 DBG("free pthi cb memory.\n");
614 *offset = 0;
615 heci_free_cb_private(priv_cb);
616 out:
617 return rets;
618 }
619
620 /**
621 * heci_start_read - the start read client message function.
622 *
623 * @dev: Device object for our driver
624 * @if_num: minor number
625 * @file_ext: private data of the file object
626 *
627 * returns 0 on success, <0 on failure.
628 */
629 int heci_start_read(struct iamt_heci_device *dev, int if_num,
630 struct heci_file_private *file_ext)
631 {
632 int rets = 0;
633 __u8 i;
634 struct heci_cb_private *priv_cb = NULL;
635
636 if ((if_num != HECI_MINOR_NUMBER) || (!dev) || (!file_ext)) {
637 DBG("received wrong function input param.\n");
638 return -ENODEV;
639 }
640 if (file_ext->state != HECI_FILE_CONNECTED) {
641 return -ENODEV;
642 }
643
644 spin_lock_bh(&dev->device_lock);
645 if (dev->heci_state != HECI_ENABLED) {
646 spin_unlock_bh(&dev->device_lock);
647 return -ENODEV;
648 }
649 spin_unlock_bh(&dev->device_lock);
650 DBG("check if read is pending.\n");
651 spin_lock_bh(&file_ext->read_io_lock);
652 if ((file_ext->read_pending) || (file_ext->read_cb != NULL)) {
653 DBG("read is pending.\n");
654 spin_unlock_bh(&file_ext->read_io_lock);
655 return -EBUSY;
656 }
657 spin_unlock_bh(&file_ext->read_io_lock);
658
659 priv_cb = kzalloc(sizeof(struct heci_cb_private), GFP_KERNEL);
660 if (!priv_cb)
661 return -ENOMEM;
662
663 spin_lock_bh(&file_ext->read_io_lock);
664 DBG("allocation call back success\n"
665 "host client = %d, ME client = %d\n",
666 file_ext->host_client_id, file_ext->me_client_id);
667 spin_unlock_bh(&file_ext->read_io_lock);
668
669 spin_lock_bh(&dev->device_lock);
670 spin_lock_bh(&file_ext->read_io_lock);
671 for (i = 0; i < dev->num_heci_me_clients; i++) {
672 if (dev->me_clients[i].client_id == file_ext->me_client_id)
673 break;
674
675 }
676
677 BUG_ON(dev->me_clients[i].client_id != file_ext->me_client_id);
678 spin_unlock_bh(&file_ext->read_io_lock);
679 if (i == dev->num_heci_me_clients) {
680 rets = -ENODEV;
681 goto unlock;
682 }
683
684 priv_cb->response_buffer.size = dev->me_clients[i].props.max_msg_length;
685 spin_unlock_bh(&dev->device_lock);
686 priv_cb->response_buffer.data =
687 kmalloc(priv_cb->response_buffer.size, GFP_KERNEL);
688 if (!priv_cb->response_buffer.data) {
689 rets = -ENOMEM;
690 goto fail;
691 }
692 DBG("allocation call back data success.\n");
693 priv_cb->major_file_operations = HECI_READ;
694 /* make sure information is zero before we start */
695 priv_cb->information = 0;
696 priv_cb->file_private = (void *) file_ext;
697 spin_lock_bh(&dev->device_lock);
698 spin_lock_bh(&file_ext->read_io_lock);
699 file_ext->read_cb = priv_cb;
700 if (dev->host_buffer_is_empty) {
701 dev->host_buffer_is_empty = 0;
702 if (!heci_send_flow_control(dev, file_ext)) {
703 rets = -ENODEV;
704 spin_unlock_bh(&file_ext->read_io_lock);
705 goto unlock;
706 } else {
707 list_add_tail(&priv_cb->cb_list,
708 &dev->read_list.heci_cb.cb_list);
709 }
710 } else {
711 list_add_tail(&priv_cb->cb_list,
712 &dev->ctrl_wr_list.heci_cb.cb_list);
713 }
714 spin_unlock_bh(&file_ext->read_io_lock);
715 spin_unlock_bh(&dev->device_lock);
716 return rets;
717 unlock:
718 spin_unlock_bh(&dev->device_lock);
719 fail:
720 heci_free_cb_private(priv_cb);
721 return rets;
722 }
723
724 /**
725 * pthi_write - write iamthif data to pthi client
726 *
727 * @dev: Device object for our driver
728 * @priv_cb: heci call back struct
729 *
730 * returns 0 on success, <0 on failure.
731 */
732 int pthi_write(struct iamt_heci_device *dev,
733 struct heci_cb_private *priv_cb)
734 {
735 int rets = 0;
736 struct heci_msg_hdr heci_hdr;
737
738 if ((!dev) || (!priv_cb))
739 return -ENODEV;
740
741 DBG("write data to pthi client.\n");
742
743 dev->iamthif_state = HECI_IAMTHIF_WRITING;
744 dev->iamthif_current_cb = priv_cb;
745 dev->iamthif_file_object = priv_cb->file_object;
746 dev->iamthif_canceled = 0;
747 dev->iamthif_ioctl = 1;
748 dev->iamthif_msg_buf_size = priv_cb->request_buffer.size;
749 memcpy(dev->iamthif_msg_buf, priv_cb->request_buffer.data,
750 priv_cb->request_buffer.size);
751
752 if (flow_ctrl_creds(dev, &dev->iamthif_file_ext) &&
753 dev->host_buffer_is_empty) {
754 dev->host_buffer_is_empty = 0;
755 if (priv_cb->request_buffer.size >
756 (((dev->host_hw_state & H_CBD) >> 24) *
757 sizeof(__u32)) - sizeof(struct heci_msg_hdr)) {
758 heci_hdr.length =
759 (((dev->host_hw_state & H_CBD) >> 24) *
760 sizeof(__u32)) - sizeof(struct heci_msg_hdr);
761 heci_hdr.msg_complete = 0;
762 } else {
763 heci_hdr.length = priv_cb->request_buffer.size;
764 heci_hdr.msg_complete = 1;
765 }
766
767 heci_hdr.host_addr = dev->iamthif_file_ext.host_client_id;
768 heci_hdr.me_addr = dev->iamthif_file_ext.me_client_id;
769 heci_hdr.reserved = 0;
770 dev->iamthif_msg_buf_index += heci_hdr.length;
771 if (!heci_write_message(dev, &heci_hdr,
772 (unsigned char *)(dev->iamthif_msg_buf),
773 heci_hdr.length))
774 return -ENODEV;
775
776 if (heci_hdr.msg_complete) {
777 flow_ctrl_reduce(dev, &dev->iamthif_file_ext);
778 dev->iamthif_flow_control_pending = 1;
779 dev->iamthif_state = HECI_IAMTHIF_FLOW_CONTROL;
780 DBG("add pthi cb to write waiting list\n");
781 dev->iamthif_current_cb = priv_cb;
782 dev->iamthif_file_object = priv_cb->file_object;
783 list_add_tail(&priv_cb->cb_list,
784 &dev->write_waiting_list.heci_cb.cb_list);
785 } else {
786 DBG("message does not complete, "
787 "so add pthi cb to write list.\n");
788 list_add_tail(&priv_cb->cb_list,
789 &dev->write_list.heci_cb.cb_list);
790 }
791 } else {
792 if (!(dev->host_buffer_is_empty))
793 DBG("host buffer is not empty");
794
795 DBG("No flow control credentials, "
796 "so add iamthif cb to write list.\n");
797 list_add_tail(&priv_cb->cb_list,
798 &dev->write_list.heci_cb.cb_list);
799 }
800 return rets;
801 }
802
803 /**
804 * iamthif_ioctl_send_msg - send cmd data to pthi client
805 *
806 * @dev: Device object for our driver
807 *
808 * returns 0 on success, <0 on failure.
809 */
810 void run_next_iamthif_cmd(struct iamt_heci_device *dev)
811 {
812 struct heci_file_private *file_ext_tmp;
813 struct heci_cb_private *priv_cb_pos = NULL;
814 struct heci_cb_private *priv_cb_next = NULL;
815 int status = 0;
816
817 if (!dev)
818 return;
819
820 dev->iamthif_msg_buf_size = 0;
821 dev->iamthif_msg_buf_index = 0;
822 dev->iamthif_canceled = 0;
823 dev->iamthif_ioctl = 1;
824 dev->iamthif_state = HECI_IAMTHIF_IDLE;
825 dev->iamthif_timer = 0;
826 dev->iamthif_file_object = NULL;
827
828 if (dev->pthi_cmd_list.status == 0 &&
829 !list_empty(&dev->pthi_cmd_list.heci_cb.cb_list)) {
830 DBG("complete pthi cmd_list cb.\n");
831
832 list_for_each_entry_safe(priv_cb_pos, priv_cb_next,
833 &dev->pthi_cmd_list.heci_cb.cb_list, cb_list) {
834 list_del(&priv_cb_pos->cb_list);
835 file_ext_tmp = (struct heci_file_private *)
836 priv_cb_pos->file_private;
837
838 if ((file_ext_tmp != NULL) &&
839 (file_ext_tmp == &dev->iamthif_file_ext)) {
840 status = pthi_write(dev, priv_cb_pos);
841 if (status != 0) {
842 DBG("pthi write failed status = %d\n",
843 status);
844 return;
845 }
846 break;
847 }
848 }
849 }
850 }
851
852 /**
853 * heci_free_cb_private - free heci_cb_private related memory
854 *
855 * @priv_cb: heci callback struct
856 */
857 void heci_free_cb_private(struct heci_cb_private *priv_cb)
858 {
859 if (priv_cb == NULL)
860 return;
861
862 kfree(priv_cb->request_buffer.data);
863 kfree(priv_cb->response_buffer.data);
864 kfree(priv_cb);
865 }
866
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