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1/*
2 * Copyright 2019 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: AMD
23 *
24 */
25
26#include "hdcp.h"
27
28static inline enum mod_hdcp_status validate_bksv(struct mod_hdcp *hdcp)
29{
30 uint64_t n = 0;
31 uint8_t count = 0;
32
33 memcpy(&n, hdcp->auth.msg.hdcp1.bksv, sizeof(uint64_t));
34
35 while (n) {
36 count++;
37 n &= (n - 1);
38 }
39 return (count == 20) ? MOD_HDCP_STATUS_SUCCESS :
40 MOD_HDCP_STATUS_HDCP1_INVALID_BKSV;
41}
42
43static inline enum mod_hdcp_status check_ksv_ready(struct mod_hdcp *hdcp)
44{
45 if (is_dp_hdcp(hdcp))
46 return (hdcp->auth.msg.hdcp1.bstatus & DP_BSTATUS_READY) ?
47 MOD_HDCP_STATUS_SUCCESS :
48 MOD_HDCP_STATUS_HDCP1_KSV_LIST_NOT_READY;
49 return (hdcp->auth.msg.hdcp1.bcaps & DRM_HDCP_DDC_BCAPS_KSV_FIFO_READY) ?
50 MOD_HDCP_STATUS_SUCCESS :
51 MOD_HDCP_STATUS_HDCP1_KSV_LIST_NOT_READY;
52}
53
54static inline enum mod_hdcp_status check_hdcp_capable_dp(struct mod_hdcp *hdcp)
55{
56 return (hdcp->auth.msg.hdcp1.bcaps & DP_BCAPS_HDCP_CAPABLE) ?
57 MOD_HDCP_STATUS_SUCCESS :
58 MOD_HDCP_STATUS_HDCP1_NOT_CAPABLE;
59}
60
61static inline enum mod_hdcp_status check_r0p_available_dp(struct mod_hdcp *hdcp)
62{
63 enum mod_hdcp_status status;
64 if (is_dp_hdcp(hdcp)) {
65 status = (hdcp->auth.msg.hdcp1.bstatus &
66 DP_BSTATUS_R0_PRIME_READY) ?
67 MOD_HDCP_STATUS_SUCCESS :
68 MOD_HDCP_STATUS_HDCP1_R0_PRIME_PENDING;
69 } else {
70 status = MOD_HDCP_STATUS_INVALID_OPERATION;
71 }
72 return status;
73}
74
75static inline enum mod_hdcp_status check_link_integrity_dp(
76 struct mod_hdcp *hdcp)
77{
78 return (hdcp->auth.msg.hdcp1.bstatus &
79 DP_BSTATUS_LINK_FAILURE) ?
80 MOD_HDCP_STATUS_HDCP1_LINK_INTEGRITY_FAILURE :
81 MOD_HDCP_STATUS_SUCCESS;
82}
83
84static inline enum mod_hdcp_status check_no_reauthentication_request_dp(
85 struct mod_hdcp *hdcp)
86{
87 return (hdcp->auth.msg.hdcp1.bstatus & DP_BSTATUS_REAUTH_REQ) ?
88 MOD_HDCP_STATUS_HDCP1_REAUTH_REQUEST_ISSUED :
89 MOD_HDCP_STATUS_SUCCESS;
90}
91
92static inline enum mod_hdcp_status check_no_max_cascade(struct mod_hdcp *hdcp)
93{
94 enum mod_hdcp_status status;
95
96 if (is_dp_hdcp(hdcp))
97 status = DRM_HDCP_MAX_CASCADE_EXCEEDED(hdcp->auth.msg.hdcp1.binfo_dp >> 8)
98 ? MOD_HDCP_STATUS_HDCP1_MAX_CASCADE_EXCEEDED_FAILURE
99 : MOD_HDCP_STATUS_SUCCESS;
100 else
101 status = DRM_HDCP_MAX_CASCADE_EXCEEDED(hdcp->auth.msg.hdcp1.bstatus >> 8)
102 ? MOD_HDCP_STATUS_HDCP1_MAX_CASCADE_EXCEEDED_FAILURE
103 : MOD_HDCP_STATUS_SUCCESS;
104 return status;
105}
106
107static inline enum mod_hdcp_status check_no_max_devs(struct mod_hdcp *hdcp)
108{
109 enum mod_hdcp_status status;
110
111 if (is_dp_hdcp(hdcp))
112 status = DRM_HDCP_MAX_DEVICE_EXCEEDED(hdcp->auth.msg.hdcp1.binfo_dp) ?
113 MOD_HDCP_STATUS_HDCP1_MAX_DEVS_EXCEEDED_FAILURE :
114 MOD_HDCP_STATUS_SUCCESS;
115 else
116 status = DRM_HDCP_MAX_DEVICE_EXCEEDED(hdcp->auth.msg.hdcp1.bstatus) ?
117 MOD_HDCP_STATUS_HDCP1_MAX_DEVS_EXCEEDED_FAILURE :
118 MOD_HDCP_STATUS_SUCCESS;
119 return status;
120}
121
122static inline uint8_t get_device_count(struct mod_hdcp *hdcp)
123{
124 return is_dp_hdcp(hdcp) ?
125 DRM_HDCP_NUM_DOWNSTREAM(hdcp->auth.msg.hdcp1.binfo_dp) :
126 DRM_HDCP_NUM_DOWNSTREAM(hdcp->auth.msg.hdcp1.bstatus);
127}
128
129static inline enum mod_hdcp_status check_device_count(struct mod_hdcp *hdcp)
130{
131 /* device count must be greater than or equal to tracked hdcp displays */
132 return (get_device_count(hdcp) < get_active_display_count(hdcp)) ?
133 MOD_HDCP_STATUS_HDCP1_DEVICE_COUNT_MISMATCH_FAILURE :
134 MOD_HDCP_STATUS_SUCCESS;
135}
136
137static enum mod_hdcp_status wait_for_active_rx(struct mod_hdcp *hdcp,
138 struct mod_hdcp_event_context *event_ctx,
139 struct mod_hdcp_transition_input_hdcp1 *input)
140{
141 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
142
143 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
144 event_ctx->unexpected_event = 1;
145 goto out;
146 }
147
148 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bksv,
149 &input->bksv_read, &status,
150 hdcp, "bksv_read"))
151 goto out;
152 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bcaps,
153 &input->bcaps_read, &status,
154 hdcp, "bcaps_read"))
155 goto out;
156out:
157 return status;
158}
159
160static enum mod_hdcp_status exchange_ksvs(struct mod_hdcp *hdcp,
161 struct mod_hdcp_event_context *event_ctx,
162 struct mod_hdcp_transition_input_hdcp1 *input)
163{
164 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
165
166 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
167 event_ctx->unexpected_event = 1;
168 goto out;
169 }
170
171 if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_create_session,
172 &input->create_session, &status,
173 hdcp, "create_session"))
174 goto out;
175 if (!mod_hdcp_execute_and_set(mod_hdcp_write_an,
176 &input->an_write, &status,
177 hdcp, "an_write"))
178 goto out;
179 if (!mod_hdcp_execute_and_set(mod_hdcp_write_aksv,
180 &input->aksv_write, &status,
181 hdcp, "aksv_write"))
182 goto out;
183 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bksv,
184 &input->bksv_read, &status,
185 hdcp, "bksv_read"))
186 goto out;
187 if (!mod_hdcp_execute_and_set(validate_bksv,
188 &input->bksv_validation, &status,
189 hdcp, "bksv_validation"))
190 goto out;
191 if (hdcp->auth.msg.hdcp1.ainfo) {
192 if (!mod_hdcp_execute_and_set(mod_hdcp_write_ainfo,
193 &input->ainfo_write, &status,
194 hdcp, "ainfo_write"))
195 goto out;
196 }
197out:
198 return status;
199}
200
201static enum mod_hdcp_status computations_validate_rx_test_for_repeater(
202 struct mod_hdcp *hdcp,
203 struct mod_hdcp_event_context *event_ctx,
204 struct mod_hdcp_transition_input_hdcp1 *input)
205{
206 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
207
208 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
209 event_ctx->unexpected_event = 1;
210 goto out;
211 }
212
213 if (!mod_hdcp_execute_and_set(mod_hdcp_read_r0p,
214 &input->r0p_read, &status,
215 hdcp, "r0p_read"))
216 goto out;
217 if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_validate_rx,
218 &input->rx_validation, &status,
219 hdcp, "rx_validation"))
220 goto out;
221 if (hdcp->connection.is_repeater) {
222 if (!hdcp->connection.link.adjust.hdcp1.postpone_encryption)
223 if (!mod_hdcp_execute_and_set(
224 mod_hdcp_hdcp1_enable_encryption,
225 &input->encryption, &status,
226 hdcp, "encryption"))
227 goto out;
228 } else {
229 if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_enable_encryption,
230 &input->encryption, &status,
231 hdcp, "encryption"))
232 goto out;
233 if (is_dp_mst_hdcp(hdcp))
234 if (!mod_hdcp_execute_and_set(
235 mod_hdcp_hdcp1_enable_dp_stream_encryption,
236 &input->stream_encryption_dp, &status,
237 hdcp, "stream_encryption_dp"))
238 goto out;
239 }
240out:
241 return status;
242}
243
244static enum mod_hdcp_status authenticated(struct mod_hdcp *hdcp,
245 struct mod_hdcp_event_context *event_ctx,
246 struct mod_hdcp_transition_input_hdcp1 *input)
247{
248 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
249
250 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
251 event_ctx->unexpected_event = 1;
252 goto out;
253 }
254
255 if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_link_maintenance,
256 &input->link_maintenance, &status,
257 hdcp, "link_maintenance"))
258 goto out;
259out:
260 return status;
261}
262
263static enum mod_hdcp_status wait_for_ready(struct mod_hdcp *hdcp,
264 struct mod_hdcp_event_context *event_ctx,
265 struct mod_hdcp_transition_input_hdcp1 *input)
266{
267 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
268
269 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK &&
270 event_ctx->event != MOD_HDCP_EVENT_CPIRQ &&
271 event_ctx->event != MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) {
272 event_ctx->unexpected_event = 1;
273 goto out;
274 }
275
276 if (is_dp_hdcp(hdcp)) {
277 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
278 &input->bstatus_read, &status,
279 hdcp, "bstatus_read"))
280 goto out;
281 if (!mod_hdcp_execute_and_set(check_link_integrity_dp,
282 &input->link_integrity_check, &status,
283 hdcp, "link_integrity_check"))
284 goto out;
285 if (!mod_hdcp_execute_and_set(check_no_reauthentication_request_dp,
286 &input->reauth_request_check, &status,
287 hdcp, "reauth_request_check"))
288 goto out;
289 } else {
290 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bcaps,
291 &input->bcaps_read, &status,
292 hdcp, "bcaps_read"))
293 goto out;
294 }
295 if (!mod_hdcp_execute_and_set(check_ksv_ready,
296 &input->ready_check, &status,
297 hdcp, "ready_check"))
298 goto out;
299out:
300 return status;
301}
302
303static enum mod_hdcp_status read_ksv_list(struct mod_hdcp *hdcp,
304 struct mod_hdcp_event_context *event_ctx,
305 struct mod_hdcp_transition_input_hdcp1 *input)
306{
307 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
308 uint8_t device_count;
309
310 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
311 event_ctx->unexpected_event = 1;
312 goto out;
313 }
314
315 if (is_dp_hdcp(hdcp)) {
316 if (!mod_hdcp_execute_and_set(mod_hdcp_read_binfo,
317 &input->binfo_read_dp, &status,
318 hdcp, "binfo_read_dp"))
319 goto out;
320 } else {
321 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
322 &input->bstatus_read, &status,
323 hdcp, "bstatus_read"))
324 goto out;
325 }
326 if (!mod_hdcp_execute_and_set(check_no_max_cascade,
327 &input->max_cascade_check, &status,
328 hdcp, "max_cascade_check"))
329 goto out;
330 if (!mod_hdcp_execute_and_set(check_no_max_devs,
331 &input->max_devs_check, &status,
332 hdcp, "max_devs_check"))
333 goto out;
334 if (!mod_hdcp_execute_and_set(check_device_count,
335 &input->device_count_check, &status,
336 hdcp, "device_count_check"))
337 goto out;
338 device_count = get_device_count(hdcp);
339 hdcp->auth.msg.hdcp1.ksvlist_size = device_count*5;
340 if (!mod_hdcp_execute_and_set(mod_hdcp_read_ksvlist,
341 &input->ksvlist_read, &status,
342 hdcp, "ksvlist_read"))
343 goto out;
344 if (!mod_hdcp_execute_and_set(mod_hdcp_read_vp,
345 &input->vp_read, &status,
346 hdcp, "vp_read"))
347 goto out;
348 if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_validate_ksvlist_vp,
349 &input->ksvlist_vp_validation, &status,
350 hdcp, "ksvlist_vp_validation"))
351 goto out;
352 if (input->encryption != PASS)
353 if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_enable_encryption,
354 &input->encryption, &status,
355 hdcp, "encryption"))
356 goto out;
357 if (is_dp_mst_hdcp(hdcp))
358 if (!mod_hdcp_execute_and_set(
359 mod_hdcp_hdcp1_enable_dp_stream_encryption,
360 &input->stream_encryption_dp, &status,
361 hdcp, "stream_encryption_dp"))
362 goto out;
363out:
364 return status;
365}
366
367static enum mod_hdcp_status determine_rx_hdcp_capable_dp(struct mod_hdcp *hdcp,
368 struct mod_hdcp_event_context *event_ctx,
369 struct mod_hdcp_transition_input_hdcp1 *input)
370{
371 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
372
373 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
374 event_ctx->unexpected_event = 1;
375 goto out;
376 }
377
378 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bcaps,
379 &input->bcaps_read, &status,
380 hdcp, "bcaps_read"))
381 goto out;
382 if (!mod_hdcp_execute_and_set(check_hdcp_capable_dp,
383 &input->hdcp_capable_dp, &status,
384 hdcp, "hdcp_capable_dp"))
385 goto out;
386out:
387 return status;
388}
389
390static enum mod_hdcp_status wait_for_r0_prime_dp(struct mod_hdcp *hdcp,
391 struct mod_hdcp_event_context *event_ctx,
392 struct mod_hdcp_transition_input_hdcp1 *input)
393{
394 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
395
396 if (event_ctx->event != MOD_HDCP_EVENT_CPIRQ &&
397 event_ctx->event != MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) {
398 event_ctx->unexpected_event = 1;
399 goto out;
400 }
401
402 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
403 &input->bstatus_read, &status,
404 hdcp, "bstatus_read"))
405 goto out;
406 if (!mod_hdcp_execute_and_set(check_r0p_available_dp,
407 &input->r0p_available_dp, &status,
408 hdcp, "r0p_available_dp"))
409 goto out;
410out:
411 return status;
412}
413
414static enum mod_hdcp_status authenticated_dp(struct mod_hdcp *hdcp,
415 struct mod_hdcp_event_context *event_ctx,
416 struct mod_hdcp_transition_input_hdcp1 *input)
417{
418 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
419
420 if (event_ctx->event != MOD_HDCP_EVENT_CPIRQ) {
421 event_ctx->unexpected_event = 1;
422 goto out;
423 }
424
425 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
426 &input->bstatus_read, &status,
427 hdcp, "bstatus_read"))
428 goto out;
429 if (!mod_hdcp_execute_and_set(check_link_integrity_dp,
430 &input->link_integrity_check, &status,
431 hdcp, "link_integrity_check"))
432 goto out;
433 if (!mod_hdcp_execute_and_set(check_no_reauthentication_request_dp,
434 &input->reauth_request_check, &status,
435 hdcp, "reauth_request_check"))
436 goto out;
437out:
438 return status;
439}
440
441uint8_t mod_hdcp_execute_and_set(
442 mod_hdcp_action func, uint8_t *flag,
443 enum mod_hdcp_status *status, struct mod_hdcp *hdcp, char *str)
444{
445 *status = func(hdcp);
446 if (*status == MOD_HDCP_STATUS_SUCCESS && *flag != PASS) {
447 HDCP_INPUT_PASS_TRACE(hdcp, str);
448 *flag = PASS;
449 } else if (*status != MOD_HDCP_STATUS_SUCCESS && *flag != FAIL) {
450 HDCP_INPUT_FAIL_TRACE(hdcp, str);
451 *flag = FAIL;
452 }
453 return (*status == MOD_HDCP_STATUS_SUCCESS);
454}
455
456enum mod_hdcp_status mod_hdcp_hdcp1_execution(struct mod_hdcp *hdcp,
457 struct mod_hdcp_event_context *event_ctx,
458 struct mod_hdcp_transition_input_hdcp1 *input)
459{
460 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
461
462 switch (current_state(hdcp)) {
463 case H1_A0_WAIT_FOR_ACTIVE_RX:
464 status = wait_for_active_rx(hdcp, event_ctx, input);
465 break;
466 case H1_A1_EXCHANGE_KSVS:
467 status = exchange_ksvs(hdcp, event_ctx, input);
468 break;
469 case H1_A2_COMPUTATIONS_A3_VALIDATE_RX_A6_TEST_FOR_REPEATER:
470 status = computations_validate_rx_test_for_repeater(hdcp,
471 event_ctx, input);
472 break;
473 case H1_A45_AUTHENTICATED:
474 status = authenticated(hdcp, event_ctx, input);
475 break;
476 case H1_A8_WAIT_FOR_READY:
477 status = wait_for_ready(hdcp, event_ctx, input);
478 break;
479 case H1_A9_READ_KSV_LIST:
480 status = read_ksv_list(hdcp, event_ctx, input);
481 break;
482 default:
483 status = MOD_HDCP_STATUS_INVALID_STATE;
484 break;
485 }
486
487 return status;
488}
489
490extern enum mod_hdcp_status mod_hdcp_hdcp1_dp_execution(struct mod_hdcp *hdcp,
491 struct mod_hdcp_event_context *event_ctx,
492 struct mod_hdcp_transition_input_hdcp1 *input)
493{
494 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
495
496 switch (current_state(hdcp)) {
497 case D1_A0_DETERMINE_RX_HDCP_CAPABLE:
498 status = determine_rx_hdcp_capable_dp(hdcp, event_ctx, input);
499 break;
500 case D1_A1_EXCHANGE_KSVS:
501 status = exchange_ksvs(hdcp, event_ctx, input);
502 break;
503 case D1_A23_WAIT_FOR_R0_PRIME:
504 status = wait_for_r0_prime_dp(hdcp, event_ctx, input);
505 break;
506 case D1_A2_COMPUTATIONS_A3_VALIDATE_RX_A5_TEST_FOR_REPEATER:
507 status = computations_validate_rx_test_for_repeater(
508 hdcp, event_ctx, input);
509 break;
510 case D1_A4_AUTHENTICATED:
511 status = authenticated_dp(hdcp, event_ctx, input);
512 break;
513 case D1_A6_WAIT_FOR_READY:
514 status = wait_for_ready(hdcp, event_ctx, input);
515 break;
516 case D1_A7_READ_KSV_LIST:
517 status = read_ksv_list(hdcp, event_ctx, input);
518 break;
519 default:
520 status = MOD_HDCP_STATUS_INVALID_STATE;
521 break;
522 }
523
524 return status;
525}