tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 /* Some MST display may choose to report the internal panel as an HDCP RX.
132 * To update this condition with 1(because the immediate repeater's internal
133 * panel is possibly not included in DEVICE_COUNT) + get_device_count(hdcp).
134 * Device count must be greater than or equal to tracked hdcp displays.
135 */
136 return ((1 + get_device_count(hdcp)) < get_active_display_count(hdcp)) ?
137 MOD_HDCP_STATUS_HDCP1_DEVICE_COUNT_MISMATCH_FAILURE :
138 MOD_HDCP_STATUS_SUCCESS;
139}
140
141static enum mod_hdcp_status wait_for_active_rx(struct mod_hdcp *hdcp,
142 struct mod_hdcp_event_context *event_ctx,
143 struct mod_hdcp_transition_input_hdcp1 *input)
144{
145 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
146
147 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
148 event_ctx->unexpected_event = 1;
149 goto out;
150 }
151
152 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bksv,
153 &input->bksv_read, &status,
154 hdcp, "bksv_read"))
155 goto out;
156 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bcaps,
157 &input->bcaps_read, &status,
158 hdcp, "bcaps_read"))
159 goto out;
160out:
161 return status;
162}
163
164static enum mod_hdcp_status exchange_ksvs(struct mod_hdcp *hdcp,
165 struct mod_hdcp_event_context *event_ctx,
166 struct mod_hdcp_transition_input_hdcp1 *input)
167{
168 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
169
170 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
171 event_ctx->unexpected_event = 1;
172 goto out;
173 }
174
175 if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_create_session,
176 &input->create_session, &status,
177 hdcp, "create_session"))
178 goto out;
179 if (!mod_hdcp_execute_and_set(mod_hdcp_write_an,
180 &input->an_write, &status,
181 hdcp, "an_write"))
182 goto out;
183 if (!mod_hdcp_execute_and_set(mod_hdcp_write_aksv,
184 &input->aksv_write, &status,
185 hdcp, "aksv_write"))
186 goto out;
187 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bksv,
188 &input->bksv_read, &status,
189 hdcp, "bksv_read"))
190 goto out;
191 if (!mod_hdcp_execute_and_set(validate_bksv,
192 &input->bksv_validation, &status,
193 hdcp, "bksv_validation"))
194 goto out;
195 if (hdcp->auth.msg.hdcp1.ainfo) {
196 if (!mod_hdcp_execute_and_set(mod_hdcp_write_ainfo,
197 &input->ainfo_write, &status,
198 hdcp, "ainfo_write"))
199 goto out;
200 }
201out:
202 return status;
203}
204
205static enum mod_hdcp_status computations_validate_rx_test_for_repeater(
206 struct mod_hdcp *hdcp,
207 struct mod_hdcp_event_context *event_ctx,
208 struct mod_hdcp_transition_input_hdcp1 *input)
209{
210 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
211
212 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
213 event_ctx->unexpected_event = 1;
214 goto out;
215 }
216
217 if (!mod_hdcp_execute_and_set(mod_hdcp_read_r0p,
218 &input->r0p_read, &status,
219 hdcp, "r0p_read"))
220 goto out;
221 if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_validate_rx,
222 &input->rx_validation, &status,
223 hdcp, "rx_validation"))
224 goto out;
225 if (hdcp->connection.is_repeater) {
226 if (!hdcp->connection.link.adjust.hdcp1.postpone_encryption)
227 if (!mod_hdcp_execute_and_set(
228 mod_hdcp_hdcp1_enable_encryption,
229 &input->encryption, &status,
230 hdcp, "encryption"))
231 goto out;
232 } else {
233 if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_enable_encryption,
234 &input->encryption, &status,
235 hdcp, "encryption"))
236 goto out;
237 if (is_dp_mst_hdcp(hdcp))
238 if (!mod_hdcp_execute_and_set(
239 mod_hdcp_hdcp1_enable_dp_stream_encryption,
240 &input->stream_encryption_dp, &status,
241 hdcp, "stream_encryption_dp"))
242 goto out;
243 }
244out:
245 return status;
246}
247
248static enum mod_hdcp_status authenticated(struct mod_hdcp *hdcp,
249 struct mod_hdcp_event_context *event_ctx,
250 struct mod_hdcp_transition_input_hdcp1 *input)
251{
252 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
253
254 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
255 event_ctx->unexpected_event = 1;
256 goto out;
257 }
258
259 if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_link_maintenance,
260 &input->link_maintenance, &status,
261 hdcp, "link_maintenance"))
262 goto out;
263out:
264 return status;
265}
266
267static enum mod_hdcp_status wait_for_ready(struct mod_hdcp *hdcp,
268 struct mod_hdcp_event_context *event_ctx,
269 struct mod_hdcp_transition_input_hdcp1 *input)
270{
271 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
272
273 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK &&
274 event_ctx->event != MOD_HDCP_EVENT_CPIRQ &&
275 event_ctx->event != MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) {
276 event_ctx->unexpected_event = 1;
277 goto out;
278 }
279
280 if (is_dp_hdcp(hdcp)) {
281 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
282 &input->bstatus_read, &status,
283 hdcp, "bstatus_read"))
284 goto out;
285 if (!mod_hdcp_execute_and_set(check_link_integrity_dp,
286 &input->link_integrity_check, &status,
287 hdcp, "link_integrity_check"))
288 goto out;
289 if (!mod_hdcp_execute_and_set(check_no_reauthentication_request_dp,
290 &input->reauth_request_check, &status,
291 hdcp, "reauth_request_check"))
292 goto out;
293 } else {
294 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bcaps,
295 &input->bcaps_read, &status,
296 hdcp, "bcaps_read"))
297 goto out;
298 }
299 if (!mod_hdcp_execute_and_set(check_ksv_ready,
300 &input->ready_check, &status,
301 hdcp, "ready_check"))
302 goto out;
303out:
304 return status;
305}
306
307static enum mod_hdcp_status read_ksv_list(struct mod_hdcp *hdcp,
308 struct mod_hdcp_event_context *event_ctx,
309 struct mod_hdcp_transition_input_hdcp1 *input)
310{
311 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
312 uint8_t device_count;
313
314 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
315 event_ctx->unexpected_event = 1;
316 goto out;
317 }
318
319 if (is_dp_hdcp(hdcp)) {
320 if (!mod_hdcp_execute_and_set(mod_hdcp_read_binfo,
321 &input->binfo_read_dp, &status,
322 hdcp, "binfo_read_dp"))
323 goto out;
324 } else {
325 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
326 &input->bstatus_read, &status,
327 hdcp, "bstatus_read"))
328 goto out;
329 }
330 if (!mod_hdcp_execute_and_set(check_no_max_cascade,
331 &input->max_cascade_check, &status,
332 hdcp, "max_cascade_check"))
333 goto out;
334 if (!mod_hdcp_execute_and_set(check_no_max_devs,
335 &input->max_devs_check, &status,
336 hdcp, "max_devs_check"))
337 goto out;
338 if (!mod_hdcp_execute_and_set(check_device_count,
339 &input->device_count_check, &status,
340 hdcp, "device_count_check"))
341 goto out;
342 device_count = get_device_count(hdcp);
343 hdcp->auth.msg.hdcp1.ksvlist_size = device_count*5;
344 if (!mod_hdcp_execute_and_set(mod_hdcp_read_ksvlist,
345 &input->ksvlist_read, &status,
346 hdcp, "ksvlist_read"))
347 goto out;
348 if (!mod_hdcp_execute_and_set(mod_hdcp_read_vp,
349 &input->vp_read, &status,
350 hdcp, "vp_read"))
351 goto out;
352 if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_validate_ksvlist_vp,
353 &input->ksvlist_vp_validation, &status,
354 hdcp, "ksvlist_vp_validation"))
355 goto out;
356 if (input->encryption != PASS)
357 if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_enable_encryption,
358 &input->encryption, &status,
359 hdcp, "encryption"))
360 goto out;
361 if (is_dp_mst_hdcp(hdcp))
362 if (!mod_hdcp_execute_and_set(
363 mod_hdcp_hdcp1_enable_dp_stream_encryption,
364 &input->stream_encryption_dp, &status,
365 hdcp, "stream_encryption_dp"))
366 goto out;
367out:
368 return status;
369}
370
371static enum mod_hdcp_status determine_rx_hdcp_capable_dp(struct mod_hdcp *hdcp,
372 struct mod_hdcp_event_context *event_ctx,
373 struct mod_hdcp_transition_input_hdcp1 *input)
374{
375 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
376
377 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
378 event_ctx->unexpected_event = 1;
379 goto out;
380 }
381
382 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bcaps,
383 &input->bcaps_read, &status,
384 hdcp, "bcaps_read"))
385 goto out;
386 if (!mod_hdcp_execute_and_set(check_hdcp_capable_dp,
387 &input->hdcp_capable_dp, &status,
388 hdcp, "hdcp_capable_dp"))
389 goto out;
390out:
391 return status;
392}
393
394static enum mod_hdcp_status wait_for_r0_prime_dp(struct mod_hdcp *hdcp,
395 struct mod_hdcp_event_context *event_ctx,
396 struct mod_hdcp_transition_input_hdcp1 *input)
397{
398 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
399
400 if (event_ctx->event != MOD_HDCP_EVENT_CPIRQ &&
401 event_ctx->event != MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) {
402 event_ctx->unexpected_event = 1;
403 goto out;
404 }
405
406 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
407 &input->bstatus_read, &status,
408 hdcp, "bstatus_read"))
409 goto out;
410 if (!mod_hdcp_execute_and_set(check_r0p_available_dp,
411 &input->r0p_available_dp, &status,
412 hdcp, "r0p_available_dp"))
413 goto out;
414out:
415 return status;
416}
417
418static enum mod_hdcp_status authenticated_dp(struct mod_hdcp *hdcp,
419 struct mod_hdcp_event_context *event_ctx,
420 struct mod_hdcp_transition_input_hdcp1 *input)
421{
422 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
423
424 if (event_ctx->event != MOD_HDCP_EVENT_CPIRQ) {
425 event_ctx->unexpected_event = 1;
426 goto out;
427 }
428
429 if (!mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
430 &input->bstatus_read, &status,
431 hdcp, "bstatus_read"))
432 goto out;
433 if (!mod_hdcp_execute_and_set(check_link_integrity_dp,
434 &input->link_integrity_check, &status,
435 hdcp, "link_integrity_check"))
436 goto out;
437 if (!mod_hdcp_execute_and_set(check_no_reauthentication_request_dp,
438 &input->reauth_request_check, &status,
439 hdcp, "reauth_request_check"))
440 goto out;
441out:
442 return status;
443}
444
445uint8_t mod_hdcp_execute_and_set(
446 mod_hdcp_action func, uint8_t *flag,
447 enum mod_hdcp_status *status, struct mod_hdcp *hdcp, char *str)
448{
449 *status = func(hdcp);
450 if (*status == MOD_HDCP_STATUS_SUCCESS && *flag != PASS) {
451 HDCP_INPUT_PASS_TRACE(hdcp, str);
452 *flag = PASS;
453 } else if (*status != MOD_HDCP_STATUS_SUCCESS && *flag != FAIL) {
454 HDCP_INPUT_FAIL_TRACE(hdcp, str);
455 *flag = FAIL;
456 }
457 return (*status == MOD_HDCP_STATUS_SUCCESS);
458}
459
460enum mod_hdcp_status mod_hdcp_hdcp1_execution(struct mod_hdcp *hdcp,
461 struct mod_hdcp_event_context *event_ctx,
462 struct mod_hdcp_transition_input_hdcp1 *input)
463{
464 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
465
466 switch (current_state(hdcp)) {
467 case H1_A0_WAIT_FOR_ACTIVE_RX:
468 status = wait_for_active_rx(hdcp, event_ctx, input);
469 break;
470 case H1_A1_EXCHANGE_KSVS:
471 status = exchange_ksvs(hdcp, event_ctx, input);
472 break;
473 case H1_A2_COMPUTATIONS_A3_VALIDATE_RX_A6_TEST_FOR_REPEATER:
474 status = computations_validate_rx_test_for_repeater(hdcp,
475 event_ctx, input);
476 break;
477 case H1_A45_AUTHENTICATED:
478 status = authenticated(hdcp, event_ctx, input);
479 break;
480 case H1_A8_WAIT_FOR_READY:
481 status = wait_for_ready(hdcp, event_ctx, input);
482 break;
483 case H1_A9_READ_KSV_LIST:
484 status = read_ksv_list(hdcp, event_ctx, input);
485 break;
486 default:
487 status = MOD_HDCP_STATUS_INVALID_STATE;
488 break;
489 }
490
491 return status;
492}
493
494extern enum mod_hdcp_status mod_hdcp_hdcp1_dp_execution(struct mod_hdcp *hdcp,
495 struct mod_hdcp_event_context *event_ctx,
496 struct mod_hdcp_transition_input_hdcp1 *input)
497{
498 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
499
500 switch (current_state(hdcp)) {
501 case D1_A0_DETERMINE_RX_HDCP_CAPABLE:
502 status = determine_rx_hdcp_capable_dp(hdcp, event_ctx, input);
503 break;
504 case D1_A1_EXCHANGE_KSVS:
505 status = exchange_ksvs(hdcp, event_ctx, input);
506 break;
507 case D1_A23_WAIT_FOR_R0_PRIME:
508 status = wait_for_r0_prime_dp(hdcp, event_ctx, input);
509 break;
510 case D1_A2_COMPUTATIONS_A3_VALIDATE_RX_A5_TEST_FOR_REPEATER:
511 status = computations_validate_rx_test_for_repeater(
512 hdcp, event_ctx, input);
513 break;
514 case D1_A4_AUTHENTICATED:
515 status = authenticated_dp(hdcp, event_ctx, input);
516 break;
517 case D1_A6_WAIT_FOR_READY:
518 status = wait_for_ready(hdcp, event_ctx, input);
519 break;
520 case D1_A7_READ_KSV_LIST:
521 status = read_ksv_list(hdcp, event_ctx, input);
522 break;
523 default:
524 status = MOD_HDCP_STATUS_INVALID_STATE;
525 break;
526 }
527
528 return status;
529}