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1/*
2 * This module provides an interface to trigger and test firmware loading.
3 *
4 * It is designed to be used for basic evaluation of the firmware loading
5 * subsystem (for example when validating firmware verification). It lacks
6 * any extra dependencies, and will not normally be loaded by the system
7 * unless explicitly requested by name.
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/printk.h>
eb910947 15#include <linux/completion.h>
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16#include <linux/firmware.h>
17#include <linux/device.h>
18#include <linux/fs.h>
19#include <linux/miscdevice.h>
20#include <linux/slab.h>
21#include <linux/uaccess.h>
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22#include <linux/delay.h>
23#include <linux/kthread.h>
24
25#define TEST_FIRMWARE_NAME "test-firmware.bin"
26#define TEST_FIRMWARE_NUM_REQS 4
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27
28static DEFINE_MUTEX(test_fw_mutex);
29static const struct firmware *test_firmware;
30
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31struct test_batched_req {
32 u8 idx;
33 int rc;
34 bool sent;
35 const struct firmware *fw;
36 const char *name;
37 struct completion completion;
38 struct task_struct *task;
39 struct device *dev;
40};
41
42/**
43 * test_config - represents configuration for the test for different triggers
44 *
45 * @name: the name of the firmware file to look for
46 * @sync_direct: when the sync trigger is used if this is true
47 * request_firmware_direct() will be used instead.
48 * @send_uevent: whether or not to send a uevent for async requests
49 * @num_requests: number of requests to try per test case. This is trigger
50 * specific.
51 * @reqs: stores all requests information
52 * @read_fw_idx: index of thread from which we want to read firmware results
53 * from through the read_fw trigger.
54 * @test_result: a test may use this to collect the result from the call
55 * of the request_firmware*() calls used in their tests. In order of
56 * priority we always keep first any setup error. If no setup errors were
57 * found then we move on to the first error encountered while running the
58 * API. Note that for async calls this typically will be a successful
59 * result (0) unless of course you've used bogus parameters, or the system
60 * is out of memory. In the async case the callback is expected to do a
61 * bit more homework to figure out what happened, unfortunately the only
62 * information passed today on error is the fact that no firmware was
63 * found so we can only assume -ENOENT on async calls if the firmware is
64 * NULL.
65 *
66 * Errors you can expect:
67 *
68 * API specific:
69 *
70 * 0: success for sync, for async it means request was sent
71 * -EINVAL: invalid parameters or request
72 * -ENOENT: files not found
73 *
74 * System environment:
75 *
76 * -ENOMEM: memory pressure on system
77 * -ENODEV: out of number of devices to test
78 * -EINVAL: an unexpected error has occurred
79 * @req_firmware: if @sync_direct is true this is set to
80 * request_firmware_direct(), otherwise request_firmware()
81 */
82struct test_config {
83 char *name;
84 bool sync_direct;
85 bool send_uevent;
86 u8 num_requests;
87 u8 read_fw_idx;
88
89 /*
90 * These below don't belong her but we'll move them once we create
91 * a struct fw_test_device and stuff the misc_dev under there later.
92 */
93 struct test_batched_req *reqs;
94 int test_result;
95 int (*req_firmware)(const struct firmware **fw, const char *name,
96 struct device *device);
97};
98
99struct test_config *test_fw_config;
100
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101static ssize_t test_fw_misc_read(struct file *f, char __user *buf,
102 size_t size, loff_t *offset)
103{
104 ssize_t rc = 0;
105
106 mutex_lock(&test_fw_mutex);
107 if (test_firmware)
108 rc = simple_read_from_buffer(buf, size, offset,
109 test_firmware->data,
110 test_firmware->size);
111 mutex_unlock(&test_fw_mutex);
112 return rc;
113}
114
115static const struct file_operations test_fw_fops = {
116 .owner = THIS_MODULE,
117 .read = test_fw_misc_read,
118};
119
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120static void __test_release_all_firmware(void)
121{
122 struct test_batched_req *req;
123 u8 i;
124
125 if (!test_fw_config->reqs)
126 return;
127
128 for (i = 0; i < test_fw_config->num_requests; i++) {
129 req = &test_fw_config->reqs[i];
130 if (req->fw)
131 release_firmware(req->fw);
132 }
133
134 vfree(test_fw_config->reqs);
135 test_fw_config->reqs = NULL;
136}
137
138static void test_release_all_firmware(void)
139{
140 mutex_lock(&test_fw_mutex);
141 __test_release_all_firmware();
142 mutex_unlock(&test_fw_mutex);
143}
144
145
146static void __test_firmware_config_free(void)
147{
148 __test_release_all_firmware();
149 kfree_const(test_fw_config->name);
150 test_fw_config->name = NULL;
151}
152
153/*
154 * XXX: move to kstrncpy() once merged.
155 *
156 * Users should use kfree_const() when freeing these.
157 */
158static int __kstrncpy(char **dst, const char *name, size_t count, gfp_t gfp)
159{
160 *dst = kstrndup(name, count, gfp);
161 if (!*dst)
162 return -ENOSPC;
163 return count;
164}
165
166static int __test_firmware_config_init(void)
167{
168 int ret;
169
170 ret = __kstrncpy(&test_fw_config->name, TEST_FIRMWARE_NAME,
171 strlen(TEST_FIRMWARE_NAME), GFP_KERNEL);
172 if (ret < 0)
173 goto out;
174
175 test_fw_config->num_requests = TEST_FIRMWARE_NUM_REQS;
176 test_fw_config->send_uevent = true;
177 test_fw_config->sync_direct = false;
178 test_fw_config->req_firmware = request_firmware;
179 test_fw_config->test_result = 0;
180 test_fw_config->reqs = NULL;
181
182 return 0;
183
184out:
185 __test_firmware_config_free();
186 return ret;
187}
188
189static ssize_t reset_store(struct device *dev,
190 struct device_attribute *attr,
191 const char *buf, size_t count)
192{
193 int ret;
194
195 mutex_lock(&test_fw_mutex);
196
197 __test_firmware_config_free();
198
199 ret = __test_firmware_config_init();
200 if (ret < 0) {
201 ret = -ENOMEM;
202 pr_err("could not alloc settings for config trigger: %d\n",
203 ret);
204 goto out;
205 }
206
207 pr_info("reset\n");
208 ret = count;
209
210out:
211 mutex_unlock(&test_fw_mutex);
212
213 return ret;
214}
215static DEVICE_ATTR_WO(reset);
216
217static ssize_t config_show(struct device *dev,
218 struct device_attribute *attr,
219 char *buf)
220{
221 int len = 0;
222
223 mutex_lock(&test_fw_mutex);
224
6831791d 225 len += scnprintf(buf, PAGE_SIZE - len,
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226 "Custom trigger configuration for: %s\n",
227 dev_name(dev));
228
229 if (test_fw_config->name)
6831791d 230 len += scnprintf(buf+len, PAGE_SIZE - len,
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231 "name:\t%s\n",
232 test_fw_config->name);
233 else
6831791d 234 len += scnprintf(buf+len, PAGE_SIZE - len,
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235 "name:\tEMTPY\n");
236
6831791d 237 len += scnprintf(buf+len, PAGE_SIZE - len,
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238 "num_requests:\t%u\n", test_fw_config->num_requests);
239
6831791d 240 len += scnprintf(buf+len, PAGE_SIZE - len,
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241 "send_uevent:\t\t%s\n",
242 test_fw_config->send_uevent ?
243 "FW_ACTION_HOTPLUG" :
244 "FW_ACTION_NOHOTPLUG");
6831791d 245 len += scnprintf(buf+len, PAGE_SIZE - len,
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246 "sync_direct:\t\t%s\n",
247 test_fw_config->sync_direct ? "true" : "false");
6831791d 248 len += scnprintf(buf+len, PAGE_SIZE - len,
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249 "read_fw_idx:\t%u\n", test_fw_config->read_fw_idx);
250
251 mutex_unlock(&test_fw_mutex);
252
253 return len;
254}
255static DEVICE_ATTR_RO(config);
256
257static ssize_t config_name_store(struct device *dev,
258 struct device_attribute *attr,
259 const char *buf, size_t count)
260{
261 int ret;
262
263 mutex_lock(&test_fw_mutex);
264 kfree_const(test_fw_config->name);
265 ret = __kstrncpy(&test_fw_config->name, buf, count, GFP_KERNEL);
266 mutex_unlock(&test_fw_mutex);
267
268 return ret;
269}
270
271/*
272 * As per sysfs_kf_seq_show() the buf is max PAGE_SIZE.
273 */
274static ssize_t config_test_show_str(char *dst,
275 char *src)
276{
277 int len;
278
279 mutex_lock(&test_fw_mutex);
280 len = snprintf(dst, PAGE_SIZE, "%s\n", src);
281 mutex_unlock(&test_fw_mutex);
282
283 return len;
284}
285
286static int test_dev_config_update_bool(const char *buf, size_t size,
287 bool *cfg)
288{
289 int ret;
290
291 mutex_lock(&test_fw_mutex);
292 if (strtobool(buf, cfg) < 0)
293 ret = -EINVAL;
294 else
295 ret = size;
296 mutex_unlock(&test_fw_mutex);
297
298 return ret;
299}
300
301static ssize_t
302test_dev_config_show_bool(char *buf,
303 bool config)
304{
305 bool val;
306
307 mutex_lock(&test_fw_mutex);
308 val = config;
309 mutex_unlock(&test_fw_mutex);
310
311 return snprintf(buf, PAGE_SIZE, "%d\n", val);
312}
313
314static ssize_t test_dev_config_show_int(char *buf, int cfg)
315{
316 int val;
317
318 mutex_lock(&test_fw_mutex);
319 val = cfg;
320 mutex_unlock(&test_fw_mutex);
321
322 return snprintf(buf, PAGE_SIZE, "%d\n", val);
323}
324
325static int test_dev_config_update_u8(const char *buf, size_t size, u8 *cfg)
326{
327 int ret;
328 long new;
329
330 ret = kstrtol(buf, 10, &new);
331 if (ret)
332 return ret;
333
334 if (new > U8_MAX)
335 return -EINVAL;
336
337 mutex_lock(&test_fw_mutex);
338 *(u8 *)cfg = new;
339 mutex_unlock(&test_fw_mutex);
340
341 /* Always return full write size even if we didn't consume all */
342 return size;
343}
344
345static ssize_t test_dev_config_show_u8(char *buf, u8 cfg)
346{
347 u8 val;
348
349 mutex_lock(&test_fw_mutex);
350 val = cfg;
351 mutex_unlock(&test_fw_mutex);
352
353 return snprintf(buf, PAGE_SIZE, "%u\n", val);
354}
355
356static ssize_t config_name_show(struct device *dev,
357 struct device_attribute *attr,
358 char *buf)
359{
360 return config_test_show_str(buf, test_fw_config->name);
361}
69d725f4 362static DEVICE_ATTR_RW(config_name);
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363
364static ssize_t config_num_requests_store(struct device *dev,
365 struct device_attribute *attr,
366 const char *buf, size_t count)
367{
368 int rc;
369
370 mutex_lock(&test_fw_mutex);
371 if (test_fw_config->reqs) {
372 pr_err("Must call release_all_firmware prior to changing config\n");
373 rc = -EINVAL;
a5befdc8 374 mutex_unlock(&test_fw_mutex);
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375 goto out;
376 }
377 mutex_unlock(&test_fw_mutex);
378
379 rc = test_dev_config_update_u8(buf, count,
380 &test_fw_config->num_requests);
381
382out:
383 return rc;
384}
385
386static ssize_t config_num_requests_show(struct device *dev,
387 struct device_attribute *attr,
388 char *buf)
389{
390 return test_dev_config_show_u8(buf, test_fw_config->num_requests);
391}
69d725f4 392static DEVICE_ATTR_RW(config_num_requests);
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393
394static ssize_t config_sync_direct_store(struct device *dev,
395 struct device_attribute *attr,
396 const char *buf, size_t count)
397{
398 int rc = test_dev_config_update_bool(buf, count,
399 &test_fw_config->sync_direct);
400
401 if (rc == count)
402 test_fw_config->req_firmware = test_fw_config->sync_direct ?
403 request_firmware_direct :
404 request_firmware;
405 return rc;
406}
407
408static ssize_t config_sync_direct_show(struct device *dev,
409 struct device_attribute *attr,
410 char *buf)
411{
412 return test_dev_config_show_bool(buf, test_fw_config->sync_direct);
413}
69d725f4 414static DEVICE_ATTR_RW(config_sync_direct);
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415
416static ssize_t config_send_uevent_store(struct device *dev,
417 struct device_attribute *attr,
418 const char *buf, size_t count)
419{
420 return test_dev_config_update_bool(buf, count,
421 &test_fw_config->send_uevent);
422}
423
424static ssize_t config_send_uevent_show(struct device *dev,
425 struct device_attribute *attr,
426 char *buf)
427{
428 return test_dev_config_show_bool(buf, test_fw_config->send_uevent);
429}
69d725f4 430static DEVICE_ATTR_RW(config_send_uevent);
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431
432static ssize_t config_read_fw_idx_store(struct device *dev,
433 struct device_attribute *attr,
434 const char *buf, size_t count)
435{
436 return test_dev_config_update_u8(buf, count,
437 &test_fw_config->read_fw_idx);
438}
439
440static ssize_t config_read_fw_idx_show(struct device *dev,
441 struct device_attribute *attr,
442 char *buf)
443{
444 return test_dev_config_show_u8(buf, test_fw_config->read_fw_idx);
445}
69d725f4 446static DEVICE_ATTR_RW(config_read_fw_idx);
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447
448
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449static ssize_t trigger_request_store(struct device *dev,
450 struct device_attribute *attr,
451 const char *buf, size_t count)
452{
453 int rc;
454 char *name;
455
be4a1326 456 name = kstrndup(buf, count, GFP_KERNEL);
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457 if (!name)
458 return -ENOSPC;
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459
460 pr_info("loading '%s'\n", name);
461
462 mutex_lock(&test_fw_mutex);
463 release_firmware(test_firmware);
464 test_firmware = NULL;
465 rc = request_firmware(&test_firmware, name, dev);
47e0bbb7 466 if (rc) {
0a8adf58 467 pr_info("load of '%s' failed: %d\n", name, rc);
47e0bbb7
BN
468 goto out;
469 }
470 pr_info("loaded: %zu\n", test_firmware->size);
471 rc = count;
472
473out:
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KC
474 mutex_unlock(&test_fw_mutex);
475
476 kfree(name);
477
47e0bbb7 478 return rc;
0a8adf58
KC
479}
480static DEVICE_ATTR_WO(trigger_request);
481
eb910947
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482static DECLARE_COMPLETION(async_fw_done);
483
484static void trigger_async_request_cb(const struct firmware *fw, void *context)
485{
486 test_firmware = fw;
487 complete(&async_fw_done);
488}
489
490static ssize_t trigger_async_request_store(struct device *dev,
491 struct device_attribute *attr,
492 const char *buf, size_t count)
493{
494 int rc;
495 char *name;
496
497 name = kstrndup(buf, count, GFP_KERNEL);
498 if (!name)
499 return -ENOSPC;
500
501 pr_info("loading '%s'\n", name);
502
503 mutex_lock(&test_fw_mutex);
504 release_firmware(test_firmware);
505 test_firmware = NULL;
506 rc = request_firmware_nowait(THIS_MODULE, 1, name, dev, GFP_KERNEL,
507 NULL, trigger_async_request_cb);
508 if (rc) {
509 pr_info("async load of '%s' failed: %d\n", name, rc);
510 kfree(name);
511 goto out;
512 }
513 /* Free 'name' ASAP, to test for race conditions */
514 kfree(name);
515
516 wait_for_completion(&async_fw_done);
517
518 if (test_firmware) {
519 pr_info("loaded: %zu\n", test_firmware->size);
520 rc = count;
521 } else {
522 pr_err("failed to async load firmware\n");
523 rc = -ENODEV;
524 }
525
526out:
527 mutex_unlock(&test_fw_mutex);
528
529 return rc;
530}
531static DEVICE_ATTR_WO(trigger_async_request);
532
061132d2
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533static ssize_t trigger_custom_fallback_store(struct device *dev,
534 struct device_attribute *attr,
535 const char *buf, size_t count)
536{
537 int rc;
538 char *name;
539
540 name = kstrndup(buf, count, GFP_KERNEL);
541 if (!name)
542 return -ENOSPC;
543
544 pr_info("loading '%s' using custom fallback mechanism\n", name);
545
546 mutex_lock(&test_fw_mutex);
547 release_firmware(test_firmware);
548 test_firmware = NULL;
549 rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG, name,
550 dev, GFP_KERNEL, NULL,
551 trigger_async_request_cb);
552 if (rc) {
553 pr_info("async load of '%s' failed: %d\n", name, rc);
554 kfree(name);
555 goto out;
556 }
557 /* Free 'name' ASAP, to test for race conditions */
558 kfree(name);
559
560 wait_for_completion(&async_fw_done);
561
562 if (test_firmware) {
563 pr_info("loaded: %zu\n", test_firmware->size);
564 rc = count;
565 } else {
566 pr_err("failed to async load firmware\n");
567 rc = -ENODEV;
568 }
569
570out:
571 mutex_unlock(&test_fw_mutex);
572
573 return rc;
574}
575static DEVICE_ATTR_WO(trigger_custom_fallback);
576
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577static int test_fw_run_batch_request(void *data)
578{
579 struct test_batched_req *req = data;
580
581 if (!req) {
582 test_fw_config->test_result = -EINVAL;
583 return -EINVAL;
584 }
585
586 req->rc = test_fw_config->req_firmware(&req->fw, req->name, req->dev);
587 if (req->rc) {
588 pr_info("#%u: batched sync load failed: %d\n",
589 req->idx, req->rc);
590 if (!test_fw_config->test_result)
591 test_fw_config->test_result = req->rc;
592 } else if (req->fw) {
593 req->sent = true;
594 pr_info("#%u: batched sync loaded %zu\n",
595 req->idx, req->fw->size);
596 }
597 complete(&req->completion);
598
599 req->task = NULL;
600
601 return 0;
602}
603
604/*
605 * We use a kthread as otherwise the kernel serializes all our sync requests
606 * and we would not be able to mimic batched requests on a sync call. Batched
607 * requests on a sync call can for instance happen on a device driver when
608 * multiple cards are used and firmware loading happens outside of probe.
609 */
610static ssize_t trigger_batched_requests_store(struct device *dev,
611 struct device_attribute *attr,
612 const char *buf, size_t count)
613{
614 struct test_batched_req *req;
615 int rc;
616 u8 i;
617
618 mutex_lock(&test_fw_mutex);
619
620 test_fw_config->reqs = vzalloc(sizeof(struct test_batched_req) *
621 test_fw_config->num_requests * 2);
622 if (!test_fw_config->reqs) {
623 rc = -ENOMEM;
624 goto out_unlock;
625 }
626
627 pr_info("batched sync firmware loading '%s' %u times\n",
628 test_fw_config->name, test_fw_config->num_requests);
629
630 for (i = 0; i < test_fw_config->num_requests; i++) {
631 req = &test_fw_config->reqs[i];
632 if (!req) {
633 WARN_ON(1);
634 rc = -ENOMEM;
635 goto out_bail;
636 }
637 req->fw = NULL;
638 req->idx = i;
639 req->name = test_fw_config->name;
640 req->dev = dev;
641 init_completion(&req->completion);
642 req->task = kthread_run(test_fw_run_batch_request, req,
643 "%s-%u", KBUILD_MODNAME, req->idx);
644 if (!req->task || IS_ERR(req->task)) {
645 pr_err("Setting up thread %u failed\n", req->idx);
646 req->task = NULL;
647 rc = -ENOMEM;
648 goto out_bail;
649 }
650 }
651
652 rc = count;
653
654 /*
655 * We require an explicit release to enable more time and delay of
656 * calling release_firmware() to improve our chances of forcing a
657 * batched request. If we instead called release_firmware() right away
658 * then we might miss on an opportunity of having a successful firmware
659 * request pass on the opportunity to be come a batched request.
660 */
661
662out_bail:
663 for (i = 0; i < test_fw_config->num_requests; i++) {
664 req = &test_fw_config->reqs[i];
665 if (req->task || req->sent)
666 wait_for_completion(&req->completion);
667 }
668
669 /* Override any worker error if we had a general setup error */
670 if (rc < 0)
671 test_fw_config->test_result = rc;
672
673out_unlock:
674 mutex_unlock(&test_fw_mutex);
675
676 return rc;
677}
678static DEVICE_ATTR_WO(trigger_batched_requests);
679
680/*
681 * We wait for each callback to return with the lock held, no need to lock here
682 */
683static void trigger_batched_cb(const struct firmware *fw, void *context)
684{
685 struct test_batched_req *req = context;
686
687 if (!req) {
688 test_fw_config->test_result = -EINVAL;
689 return;
690 }
691
692 /* forces *some* batched requests to queue up */
693 if (!req->idx)
694 ssleep(2);
695
696 req->fw = fw;
697
698 /*
699 * Unfortunately the firmware API gives us nothing other than a null FW
700 * if the firmware was not found on async requests. Best we can do is
701 * just assume -ENOENT. A better API would pass the actual return
702 * value to the callback.
703 */
704 if (!fw && !test_fw_config->test_result)
705 test_fw_config->test_result = -ENOENT;
706
707 complete(&req->completion);
708}
709
710static
711ssize_t trigger_batched_requests_async_store(struct device *dev,
712 struct device_attribute *attr,
713 const char *buf, size_t count)
714{
715 struct test_batched_req *req;
716 bool send_uevent;
717 int rc;
718 u8 i;
719
720 mutex_lock(&test_fw_mutex);
721
722 test_fw_config->reqs = vzalloc(sizeof(struct test_batched_req) *
723 test_fw_config->num_requests * 2);
724 if (!test_fw_config->reqs) {
725 rc = -ENOMEM;
726 goto out;
727 }
728
729 pr_info("batched loading '%s' custom fallback mechanism %u times\n",
730 test_fw_config->name, test_fw_config->num_requests);
731
732 send_uevent = test_fw_config->send_uevent ? FW_ACTION_HOTPLUG :
733 FW_ACTION_NOHOTPLUG;
734
735 for (i = 0; i < test_fw_config->num_requests; i++) {
736 req = &test_fw_config->reqs[i];
737 if (!req) {
738 WARN_ON(1);
739 goto out_bail;
740 }
741 req->name = test_fw_config->name;
742 req->fw = NULL;
743 req->idx = i;
744 init_completion(&req->completion);
745 rc = request_firmware_nowait(THIS_MODULE, send_uevent,
746 req->name,
747 dev, GFP_KERNEL, req,
748 trigger_batched_cb);
749 if (rc) {
750 pr_info("#%u: batched async load failed setup: %d\n",
751 i, rc);
752 req->rc = rc;
753 goto out_bail;
754 } else
755 req->sent = true;
756 }
757
758 rc = count;
759
760out_bail:
761
762 /*
763 * We require an explicit release to enable more time and delay of
764 * calling release_firmware() to improve our chances of forcing a
765 * batched request. If we instead called release_firmware() right away
766 * then we might miss on an opportunity of having a successful firmware
767 * request pass on the opportunity to be come a batched request.
768 */
769
770 for (i = 0; i < test_fw_config->num_requests; i++) {
771 req = &test_fw_config->reqs[i];
772 if (req->sent)
773 wait_for_completion(&req->completion);
774 }
775
776 /* Override any worker error if we had a general setup error */
777 if (rc < 0)
778 test_fw_config->test_result = rc;
779
780out:
781 mutex_unlock(&test_fw_mutex);
782
783 return rc;
784}
785static DEVICE_ATTR_WO(trigger_batched_requests_async);
786
787static ssize_t test_result_show(struct device *dev,
788 struct device_attribute *attr,
789 char *buf)
790{
791 return test_dev_config_show_int(buf, test_fw_config->test_result);
792}
793static DEVICE_ATTR_RO(test_result);
794
795static ssize_t release_all_firmware_store(struct device *dev,
796 struct device_attribute *attr,
797 const char *buf, size_t count)
798{
799 test_release_all_firmware();
800 return count;
801}
802static DEVICE_ATTR_WO(release_all_firmware);
803
804static ssize_t read_firmware_show(struct device *dev,
805 struct device_attribute *attr,
806 char *buf)
807{
808 struct test_batched_req *req;
809 u8 idx;
810 ssize_t rc = 0;
811
812 mutex_lock(&test_fw_mutex);
813
814 idx = test_fw_config->read_fw_idx;
815 if (idx >= test_fw_config->num_requests) {
816 rc = -ERANGE;
817 goto out;
818 }
819
820 if (!test_fw_config->reqs) {
821 rc = -EINVAL;
822 goto out;
823 }
824
825 req = &test_fw_config->reqs[idx];
826 if (!req->fw) {
827 pr_err("#%u: failed to async load firmware\n", idx);
828 rc = -ENOENT;
829 goto out;
830 }
831
832 pr_info("#%u: loaded %zu\n", idx, req->fw->size);
833
834 if (req->fw->size > PAGE_SIZE) {
835 pr_err("Testing interface must use PAGE_SIZE firmware for now\n");
836 rc = -EINVAL;
44a5b964 837 goto out;
c92316bf
LR
838 }
839 memcpy(buf, req->fw->data, req->fw->size);
840
841 rc = req->fw->size;
842out:
843 mutex_unlock(&test_fw_mutex);
844
845 return rc;
846}
847static DEVICE_ATTR_RO(read_firmware);
848
083a93b0
LR
849#define TEST_FW_DEV_ATTR(name) &dev_attr_##name.attr
850
851static struct attribute *test_dev_attrs[] = {
c92316bf
LR
852 TEST_FW_DEV_ATTR(reset),
853
854 TEST_FW_DEV_ATTR(config),
855 TEST_FW_DEV_ATTR(config_name),
856 TEST_FW_DEV_ATTR(config_num_requests),
857 TEST_FW_DEV_ATTR(config_sync_direct),
858 TEST_FW_DEV_ATTR(config_send_uevent),
859 TEST_FW_DEV_ATTR(config_read_fw_idx),
860
861 /* These don't use the config at all - they could be ported! */
083a93b0
LR
862 TEST_FW_DEV_ATTR(trigger_request),
863 TEST_FW_DEV_ATTR(trigger_async_request),
061132d2 864 TEST_FW_DEV_ATTR(trigger_custom_fallback),
c92316bf
LR
865
866 /* These use the config and can use the test_result */
867 TEST_FW_DEV_ATTR(trigger_batched_requests),
868 TEST_FW_DEV_ATTR(trigger_batched_requests_async),
869
870 TEST_FW_DEV_ATTR(release_all_firmware),
871 TEST_FW_DEV_ATTR(test_result),
872 TEST_FW_DEV_ATTR(read_firmware),
083a93b0
LR
873 NULL,
874};
875
876ATTRIBUTE_GROUPS(test_dev);
877
67fd553c
LR
878static struct miscdevice test_fw_misc_device = {
879 .minor = MISC_DYNAMIC_MINOR,
880 .name = "test_firmware",
881 .fops = &test_fw_fops,
083a93b0 882 .groups = test_dev_groups,
67fd553c
LR
883};
884
0a8adf58
KC
885static int __init test_firmware_init(void)
886{
887 int rc;
888
c92316bf
LR
889 test_fw_config = kzalloc(sizeof(struct test_config), GFP_KERNEL);
890 if (!test_fw_config)
891 return -ENOMEM;
892
893 rc = __test_firmware_config_init();
311b9b49
WW
894 if (rc) {
895 kfree(test_fw_config);
896 pr_err("could not init firmware test config: %d\n", rc);
c92316bf 897 return rc;
311b9b49 898 }
c92316bf 899
0a8adf58
KC
900 rc = misc_register(&test_fw_misc_device);
901 if (rc) {
c92316bf 902 kfree(test_fw_config);
0a8adf58
KC
903 pr_err("could not register misc device: %d\n", rc);
904 return rc;
905 }
eb910947 906
0a8adf58
KC
907 pr_warn("interface ready\n");
908
909 return 0;
0a8adf58
KC
910}
911
912module_init(test_firmware_init);
913
914static void __exit test_firmware_exit(void)
915{
c92316bf 916 mutex_lock(&test_fw_mutex);
0a8adf58 917 release_firmware(test_firmware);
0a8adf58 918 misc_deregister(&test_fw_misc_device);
c92316bf
LR
919 __test_firmware_config_free();
920 kfree(test_fw_config);
921 mutex_unlock(&test_fw_mutex);
922
0a8adf58
KC
923 pr_warn("removed interface\n");
924}
925
926module_exit(test_firmware_exit);
927
928MODULE_AUTHOR("Kees Cook <keescook@chromium.org>");
929MODULE_LICENSE("GPL");