1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019 Intel Corporation.
*
* Authors:
* Ramalingam C <ramalingam.c@intel.com>
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gfp.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/firmware.h>
#include <drm/drm_hdcp.h>
#include <drm/drm_sysfs.h>
#include <drm/drm_print.h>
#include <drm/drm_device.h>
#include <drm/drm_property.h>
#include <drm/drm_mode_object.h>
#include <drm/drm_connector.h>
#include "drm_internal.h"
static inline void drm_hdcp_print_ksv(const u8 *ksv)
{
DRM_DEBUG("\t%#02x, %#02x, %#02x, %#02x, %#02x\n",
ksv[0], ksv[1], ksv[2], ksv[3], ksv[4]);
}
static u32 drm_hdcp_get_revoked_ksv_count(const u8 *buf, u32 vrls_length)
{
u32 parsed_bytes = 0, ksv_count = 0, vrl_ksv_cnt, vrl_sz;
while (parsed_bytes < vrls_length) {
vrl_ksv_cnt = *buf;
ksv_count += vrl_ksv_cnt;
vrl_sz = (vrl_ksv_cnt * DRM_HDCP_KSV_LEN) + 1;
buf += vrl_sz;
parsed_bytes += vrl_sz;
}
/*
* When vrls are not valid, ksvs are not considered.
* Hence SRM will be discarded.
*/
if (parsed_bytes != vrls_length)
ksv_count = 0;
return ksv_count;
}
static u32 drm_hdcp_get_revoked_ksvs(const u8 *buf, u8 **revoked_ksv_list,
u32 vrls_length)
{
u32 vrl_ksv_cnt, vrl_ksv_sz, vrl_idx = 0;
u32 parsed_bytes = 0, ksv_count = 0;
do {
vrl_ksv_cnt = *buf;
vrl_ksv_sz = vrl_ksv_cnt * DRM_HDCP_KSV_LEN;
buf++;
DRM_DEBUG("vrl: %d, Revoked KSVs: %d\n", vrl_idx++,
vrl_ksv_cnt);
memcpy((*revoked_ksv_list) + (ksv_count * DRM_HDCP_KSV_LEN),
buf, vrl_ksv_sz);
ksv_count += vrl_ksv_cnt;
buf += vrl_ksv_sz;
parsed_bytes += (vrl_ksv_sz + 1);
} while (parsed_bytes < vrls_length);
return ksv_count;
}
static inline u32 get_vrl_length(const u8 *buf)
{
return drm_hdcp_be24_to_cpu(buf);
}
static int drm_hdcp_parse_hdcp1_srm(const u8 *buf, size_t count,
u8 **revoked_ksv_list, u32 *revoked_ksv_cnt)
{
struct hdcp_srm_header *header;
u32 vrl_length, ksv_count;
if (count < (sizeof(struct hdcp_srm_header) +
DRM_HDCP_1_4_VRL_LENGTH_SIZE + DRM_HDCP_1_4_DCP_SIG_SIZE)) {
DRM_ERROR("Invalid blob length\n");
return -EINVAL;
}
header = (struct hdcp_srm_header *)buf;
DRM_DEBUG("SRM ID: 0x%x, SRM Ver: 0x%x, SRM Gen No: 0x%x\n",
header->srm_id,
be16_to_cpu(header->srm_version), header->srm_gen_no);
WARN_ON(header->reserved);
buf = buf + sizeof(*header);
vrl_length = get_vrl_length(buf);
if (count < (sizeof(struct hdcp_srm_header) + vrl_length) ||
vrl_length < (DRM_HDCP_1_4_VRL_LENGTH_SIZE +
DRM_HDCP_1_4_DCP_SIG_SIZE)) {
DRM_ERROR("Invalid blob length or vrl length\n");
return -EINVAL;
}
/* Length of the all vrls combined */
vrl_length -= (DRM_HDCP_1_4_VRL_LENGTH_SIZE +
DRM_HDCP_1_4_DCP_SIG_SIZE);
if (!vrl_length) {
DRM_ERROR("No vrl found\n");
return -EINVAL;
}
buf += DRM_HDCP_1_4_VRL_LENGTH_SIZE;
ksv_count = drm_hdcp_get_revoked_ksv_count(buf, vrl_length);
if (!ksv_count) {
DRM_DEBUG("Revoked KSV count is 0\n");
return 0;
}
*revoked_ksv_list = kcalloc(ksv_count, DRM_HDCP_KSV_LEN, GFP_KERNEL);
if (!*revoked_ksv_list) {
DRM_ERROR("Out of Memory\n");
return -ENOMEM;
}
if (drm_hdcp_get_revoked_ksvs(buf, revoked_ksv_list,
vrl_length) != ksv_count) {
*revoked_ksv_cnt = 0;
kfree(*revoked_ksv_list);
return -EINVAL;
}
*revoked_ksv_cnt = ksv_count;
return 0;
}
static int drm_hdcp_parse_hdcp2_srm(const u8 *buf, size_t count,
u8 **revoked_ksv_list, u32 *revoked_ksv_cnt)
{
struct hdcp_srm_header *header;
u32 vrl_length, ksv_count, ksv_sz;
if (count < (sizeof(struct hdcp_srm_header) +
DRM_HDCP_2_VRL_LENGTH_SIZE + DRM_HDCP_2_DCP_SIG_SIZE)) {
DRM_ERROR("Invalid blob length\n");
return -EINVAL;
}
header = (struct hdcp_srm_header *)buf;
DRM_DEBUG("SRM ID: 0x%x, SRM Ver: 0x%x, SRM Gen No: 0x%x\n",
header->srm_id & DRM_HDCP_SRM_ID_MASK,
be16_to_cpu(header->srm_version), header->srm_gen_no);
if (header->reserved)
return -EINVAL;
buf = buf + sizeof(*header);
vrl_length = get_vrl_length(buf);
if (count < (sizeof(struct hdcp_srm_header) + vrl_length) ||
vrl_length < (DRM_HDCP_2_VRL_LENGTH_SIZE +
DRM_HDCP_2_DCP_SIG_SIZE)) {
DRM_ERROR("Invalid blob length or vrl length\n");
return -EINVAL;
}
/* Length of the all vrls combined */
vrl_length -= (DRM_HDCP_2_VRL_LENGTH_SIZE +
DRM_HDCP_2_DCP_SIG_SIZE);
if (!vrl_length) {
DRM_ERROR("No vrl found\n");
return -EINVAL;
}
buf += DRM_HDCP_2_VRL_LENGTH_SIZE;
ksv_count = (*buf << 2) | DRM_HDCP_2_KSV_COUNT_2_LSBITS(*(buf + 1));
if (!ksv_count) {
DRM_DEBUG("Revoked KSV count is 0\n");
return 0;
}
*revoked_ksv_list = kcalloc(ksv_count, DRM_HDCP_KSV_LEN, GFP_KERNEL);
if (!*revoked_ksv_list) {
DRM_ERROR("Out of Memory\n");
return -ENOMEM;
}
ksv_sz = ksv_count * DRM_HDCP_KSV_LEN;
buf += DRM_HDCP_2_NO_OF_DEV_PLUS_RESERVED_SZ;
DRM_DEBUG("Revoked KSVs: %d\n", ksv_count);
memcpy(*revoked_ksv_list, buf, ksv_sz);
*revoked_ksv_cnt = ksv_count;
return 0;
}
static inline bool is_srm_version_hdcp1(const u8 *buf)
{
return *buf == (u8)(DRM_HDCP_1_4_SRM_ID << 4);
}
static inline bool is_srm_version_hdcp2(const u8 *buf)
{
return *buf == (u8)(DRM_HDCP_2_SRM_ID << 4 | DRM_HDCP_2_INDICATOR);
}
static int drm_hdcp_srm_update(const u8 *buf, size_t count,
u8 **revoked_ksv_list, u32 *revoked_ksv_cnt)
{
if (count < sizeof(struct hdcp_srm_header))
return -EINVAL;
if (is_srm_version_hdcp1(buf))
return drm_hdcp_parse_hdcp1_srm(buf, count, revoked_ksv_list,
revoked_ksv_cnt);
else if (is_srm_version_hdcp2(buf))
return drm_hdcp_parse_hdcp2_srm(buf, count, revoked_ksv_list,
revoked_ksv_cnt);
else
return -EINVAL;
}
static int drm_hdcp_request_srm(struct drm_device *drm_dev,
u8 **revoked_ksv_list, u32 *revoked_ksv_cnt)
{
char fw_name[36] = "display_hdcp_srm.bin";
const struct firmware *fw;
int ret;
ret = request_firmware_direct(&fw, (const char *)fw_name,
drm_dev->dev);
if (ret < 0)
goto exit;
if (fw->size && fw->data)
ret = drm_hdcp_srm_update(fw->data, fw->size, revoked_ksv_list,
revoked_ksv_cnt);
exit:
release_firmware(fw);
return ret;
}
/**
* drm_hdcp_check_ksvs_revoked - Check the revoked status of the IDs
*
* @drm_dev: drm_device for which HDCP revocation check is requested
* @ksvs: List of KSVs (HDCP receiver IDs)
* @ksv_count: KSV count passed in through @ksvs
*
* This function reads the HDCP
|