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 u8 bksv[sizeof(n)] = { };
33
34 memcpy(bksv, hdcp->auth.msg.hdcp1.bksv, sizeof(hdcp->auth.msg.hdcp1.bksv));
35 n = *(uint64_t *)bksv;
36
37 while (n) {
38 count++;
39 n &= (n - 1);
40 }
41 return (count == 20) ? MOD_HDCP_STATUS_SUCCESS :
42 MOD_HDCP_STATUS_HDCP1_INVALID_BKSV;
43}
44
45static inline enum mod_hdcp_status check_ksv_ready(struct mod_hdcp *hdcp)
46{
47 if (is_dp_hdcp(hdcp))
48 return (hdcp->auth.msg.hdcp1.bstatus & DP_BSTATUS_READY) ?
49 MOD_HDCP_STATUS_SUCCESS :
50 MOD_HDCP_STATUS_HDCP1_KSV_LIST_NOT_READY;
51 return (hdcp->auth.msg.hdcp1.bcaps & DRM_HDCP_DDC_BCAPS_KSV_FIFO_READY) ?
52 MOD_HDCP_STATUS_SUCCESS :
53 MOD_HDCP_STATUS_HDCP1_KSV_LIST_NOT_READY;
54}
55
56static inline enum mod_hdcp_status check_hdcp_capable_dp(struct mod_hdcp *hdcp)
57{
58 return (hdcp->auth.msg.hdcp1.bcaps & DP_BCAPS_HDCP_CAPABLE) ?
59 MOD_HDCP_STATUS_SUCCESS :
60 MOD_HDCP_STATUS_HDCP1_NOT_CAPABLE;
61}
62
63static inline enum mod_hdcp_status check_r0p_available_dp(struct mod_hdcp *hdcp)
64{
65 enum mod_hdcp_status status;
66
67 if (is_dp_hdcp(hdcp)) {
68 status = (hdcp->auth.msg.hdcp1.bstatus &
69 DP_BSTATUS_R0_PRIME_READY) ?
70 MOD_HDCP_STATUS_SUCCESS :
71 MOD_HDCP_STATUS_HDCP1_R0_PRIME_PENDING;
72 } else {
73 status = MOD_HDCP_STATUS_INVALID_OPERATION;
74 }
75 return status;
76}
77
78static inline enum mod_hdcp_status check_link_integrity_dp(
79 struct mod_hdcp *hdcp)
80{
81 return (hdcp->auth.msg.hdcp1.bstatus &
82 DP_BSTATUS_LINK_FAILURE) ?
83 MOD_HDCP_STATUS_HDCP1_LINK_INTEGRITY_FAILURE :
84 MOD_HDCP_STATUS_SUCCESS;
85}
86
87static inline enum mod_hdcp_status check_no_reauthentication_request_dp(
88 struct mod_hdcp *hdcp)
89{
90 return (hdcp->auth.msg.hdcp1.bstatus & DP_BSTATUS_REAUTH_REQ) ?
91 MOD_HDCP_STATUS_HDCP1_REAUTH_REQUEST_ISSUED :
92 MOD_HDCP_STATUS_SUCCESS;
93}
94
95static inline enum mod_hdcp_status check_no_max_cascade(struct mod_hdcp *hdcp)
96{
97 enum mod_hdcp_status status;
98
99 if (is_dp_hdcp(hdcp))
100 status = DRM_HDCP_MAX_CASCADE_EXCEEDED(hdcp->auth.msg.hdcp1.binfo_dp >> 8)
101 ? MOD_HDCP_STATUS_HDCP1_MAX_CASCADE_EXCEEDED_FAILURE
102 : MOD_HDCP_STATUS_SUCCESS;
103 else
104 status = DRM_HDCP_MAX_CASCADE_EXCEEDED(hdcp->auth.msg.hdcp1.bstatus >> 8)
105 ? MOD_HDCP_STATUS_HDCP1_MAX_CASCADE_EXCEEDED_FAILURE
106 : MOD_HDCP_STATUS_SUCCESS;
107 return status;
108}
109
110static inline enum mod_hdcp_status check_no_max_devs(struct mod_hdcp *hdcp)
111{
112 enum mod_hdcp_status status;
113
114 if (is_dp_hdcp(hdcp))
115 status = DRM_HDCP_MAX_DEVICE_EXCEEDED(hdcp->auth.msg.hdcp1.binfo_dp) ?
116 MOD_HDCP_STATUS_HDCP1_MAX_DEVS_EXCEEDED_FAILURE :
117 MOD_HDCP_STATUS_SUCCESS;
118 else
119 status = DRM_HDCP_MAX_DEVICE_EXCEEDED(hdcp->auth.msg.hdcp1.bstatus) ?
120 MOD_HDCP_STATUS_HDCP1_MAX_DEVS_EXCEEDED_FAILURE :
121 MOD_HDCP_STATUS_SUCCESS;
122 return status;
123}
124
125static inline uint8_t get_device_count(struct mod_hdcp *hdcp)
126{
127 return is_dp_hdcp(hdcp) ?
128 DRM_HDCP_NUM_DOWNSTREAM(hdcp->auth.msg.hdcp1.binfo_dp) :
129 DRM_HDCP_NUM_DOWNSTREAM(hdcp->auth.msg.hdcp1.bstatus);
130}
131
132static inline enum mod_hdcp_status check_device_count(struct mod_hdcp *hdcp)
133{
134 /* Avoid device count == 0 to do authentication */
135 if (get_device_count(hdcp) == 0)
136 return MOD_HDCP_STATUS_HDCP1_DEVICE_COUNT_MISMATCH_FAILURE;
137
138 /* Some MST display may choose to report the internal panel as an HDCP RX.
139 * To update this condition with 1(because the immediate repeater's internal
140 * panel is possibly not included in DEVICE_COUNT) + get_device_count(hdcp).
141 * Device count must be greater than or equal to tracked hdcp displays.
142 */
143 return ((1 + get_device_count(hdcp)) < get_active_display_count(hdcp)) ?
144 MOD_HDCP_STATUS_HDCP1_DEVICE_COUNT_MISMATCH_FAILURE :
145 MOD_HDCP_STATUS_SUCCESS;
146}
147
148static enum mod_hdcp_status wait_for_active_rx(struct mod_hdcp *hdcp,
149 struct mod_hdcp_event_context *event_ctx,
150 struct mod_hdcp_transition_input_hdcp1 *input)
151{
152 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
153
154 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
155 event_ctx->unexpected_event = 1;
156 goto out;
157 }
158
159 if (!mod_hdcp_execute_and_set(func: mod_hdcp_read_bksv,
160 flag: &input->bksv_read, status: &status,
161 hdcp, str: "bksv_read"))
162 goto out;
163 if (!mod_hdcp_execute_and_set(func: mod_hdcp_read_bcaps,
164 flag: &input->bcaps_read, status: &status,
165 hdcp, str: "bcaps_read"))
166 goto out;
167out:
168 return status;
169}
170
171static enum mod_hdcp_status exchange_ksvs(struct mod_hdcp *hdcp,
172 struct mod_hdcp_event_context *event_ctx,
173 struct mod_hdcp_transition_input_hdcp1 *input)
174{
175 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
176
177 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
178 event_ctx->unexpected_event = 1;
179 goto out;
180 }
181
182 if (!mod_hdcp_execute_and_set(func: mod_hdcp_hdcp1_create_session,
183 flag: &input->create_session, status: &status,
184 hdcp, str: "create_session"))
185 goto out;
186 if (!mod_hdcp_execute_and_set(func: mod_hdcp_write_an,
187 flag: &input->an_write, status: &status,
188 hdcp, str: "an_write"))
189 goto out;
190 if (!mod_hdcp_execute_and_set(func: mod_hdcp_write_aksv,
191 flag: &input->aksv_write, status: &status,
192 hdcp, str: "aksv_write"))
193 goto out;
194 if (!mod_hdcp_execute_and_set(func: mod_hdcp_read_bksv,
195 flag: &input->bksv_read, status: &status,
196 hdcp, str: "bksv_read"))
197 goto out;
198 if (!mod_hdcp_execute_and_set(func: validate_bksv,
199 flag: &input->bksv_validation, status: &status,
200 hdcp, str: "bksv_validation"))
201 goto out;
202 if (hdcp->auth.msg.hdcp1.ainfo) {
203 if (!mod_hdcp_execute_and_set(func: mod_hdcp_write_ainfo,
204 flag: &input->ainfo_write, status: &status,
205 hdcp, str: "ainfo_write"))
206 goto out;
207 }
208out:
209 return status;
210}
211
212static enum mod_hdcp_status computations_validate_rx_test_for_repeater(
213 struct mod_hdcp *hdcp,
214 struct mod_hdcp_event_context *event_ctx,
215 struct mod_hdcp_transition_input_hdcp1 *input)
216{
217 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
218
219 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
220 event_ctx->unexpected_event = 1;
221 goto out;
222 }
223
224 if (!mod_hdcp_execute_and_set(func: mod_hdcp_read_r0p,
225 flag: &input->r0p_read, status: &status,
226 hdcp, str: "r0p_read"))
227 goto out;
228 if (!mod_hdcp_execute_and_set(func: mod_hdcp_hdcp1_validate_rx,
229 flag: &input->rx_validation, status: &status,
230 hdcp, str: "rx_validation"))
231 goto out;
232 if (hdcp->connection.is_repeater) {
233 if (!hdcp->connection.link.adjust.hdcp1.postpone_encryption)
234 if (!mod_hdcp_execute_and_set(
235 func: mod_hdcp_hdcp1_enable_encryption,
236 flag: &input->encryption, status: &status,
237 hdcp, str: "encryption"))
238 goto out;
239 } else {
240 if (!mod_hdcp_execute_and_set(func: mod_hdcp_hdcp1_enable_encryption,
241 flag: &input->encryption, status: &status,
242 hdcp, str: "encryption"))
243 goto out;
244 if (is_dp_mst_hdcp(hdcp))
245 if (!mod_hdcp_execute_and_set(
246 func: mod_hdcp_hdcp1_enable_dp_stream_encryption,
247 flag: &input->stream_encryption_dp, status: &status,
248 hdcp, str: "stream_encryption_dp"))
249 goto out;
250 }
251out:
252 return status;
253}
254
255static enum mod_hdcp_status authenticated(struct mod_hdcp *hdcp,
256 struct mod_hdcp_event_context *event_ctx,
257 struct mod_hdcp_transition_input_hdcp1 *input)
258{
259 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
260
261 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
262 event_ctx->unexpected_event = 1;
263 goto out;
264 }
265
266 mod_hdcp_execute_and_set(func: mod_hdcp_hdcp1_link_maintenance,
267 flag: &input->link_maintenance, status: &status,
268 hdcp, str: "link_maintenance");
269out:
270 return status;
271}
272
273static enum mod_hdcp_status wait_for_ready(struct mod_hdcp *hdcp,
274 struct mod_hdcp_event_context *event_ctx,
275 struct mod_hdcp_transition_input_hdcp1 *input)
276{
277 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
278
279 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK &&
280 event_ctx->event != MOD_HDCP_EVENT_CPIRQ &&
281 event_ctx->event != MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) {
282 event_ctx->unexpected_event = 1;
283 goto out;
284 }
285
286 if (is_dp_hdcp(hdcp)) {
287 if (!mod_hdcp_execute_and_set(func: mod_hdcp_read_bstatus,
288 flag: &input->bstatus_read, status: &status,
289 hdcp, str: "bstatus_read"))
290 goto out;
291 if (!mod_hdcp_execute_and_set(func: check_link_integrity_dp,
292 flag: &input->link_integrity_check, status: &status,
293 hdcp, str: "link_integrity_check"))
294 goto out;
295 if (!mod_hdcp_execute_and_set(func: check_no_reauthentication_request_dp,
296 flag: &input->reauth_request_check, status: &status,
297 hdcp, str: "reauth_request_check"))
298 goto out;
299 } else {
300 if (!mod_hdcp_execute_and_set(func: mod_hdcp_read_bcaps,
301 flag: &input->bcaps_read, status: &status,
302 hdcp, str: "bcaps_read"))
303 goto out;
304 }
305 if (!mod_hdcp_execute_and_set(func: check_ksv_ready,
306 flag: &input->ready_check, status: &status,
307 hdcp, str: "ready_check"))
308 goto out;
309out:
310 return status;
311}
312
313static enum mod_hdcp_status read_ksv_list(struct mod_hdcp *hdcp,
314 struct mod_hdcp_event_context *event_ctx,
315 struct mod_hdcp_transition_input_hdcp1 *input)
316{
317 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
318 uint8_t device_count;
319
320 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
321 event_ctx->unexpected_event = 1;
322 goto out;
323 }
324
325 if (is_dp_hdcp(hdcp)) {
326 if (!mod_hdcp_execute_and_set(func: mod_hdcp_read_binfo,
327 flag: &input->binfo_read_dp, status: &status,
328 hdcp, str: "binfo_read_dp"))
329 goto out;
330 } else {
331 if (!mod_hdcp_execute_and_set(func: mod_hdcp_read_bstatus,
332 flag: &input->bstatus_read, status: &status,
333 hdcp, str: "bstatus_read"))
334 goto out;
335 }
336 if (!mod_hdcp_execute_and_set(func: check_no_max_cascade,
337 flag: &input->max_cascade_check, status: &status,
338 hdcp, str: "max_cascade_check"))
339 goto out;
340 if (!mod_hdcp_execute_and_set(func: check_no_max_devs,
341 flag: &input->max_devs_check, status: &status,
342 hdcp, str: "max_devs_check"))
343 goto out;
344 if (!mod_hdcp_execute_and_set(func: check_device_count,
345 flag: &input->device_count_check, status: &status,
346 hdcp, str: "device_count_check"))
347 goto out;
348 device_count = get_device_count(hdcp);
349 hdcp->auth.msg.hdcp1.ksvlist_size = device_count*5;
350 if (!mod_hdcp_execute_and_set(func: mod_hdcp_read_ksvlist,
351 flag: &input->ksvlist_read, status: &status,
352 hdcp, str: "ksvlist_read"))
353 goto out;
354 if (!mod_hdcp_execute_and_set(func: mod_hdcp_read_vp,
355 flag: &input->vp_read, status: &status,
356 hdcp, str: "vp_read"))
357 goto out;
358 if (!mod_hdcp_execute_and_set(func: mod_hdcp_hdcp1_validate_ksvlist_vp,
359 flag: &input->ksvlist_vp_validation, status: &status,
360 hdcp, str: "ksvlist_vp_validation"))
361 goto out;
362 if (input->encryption != PASS)
363 if (!mod_hdcp_execute_and_set(func: mod_hdcp_hdcp1_enable_encryption,
364 flag: &input->encryption, status: &status,
365 hdcp, str: "encryption"))
366 goto out;
367 if (is_dp_mst_hdcp(hdcp))
368 if (!mod_hdcp_execute_and_set(
369 func: mod_hdcp_hdcp1_enable_dp_stream_encryption,
370 flag: &input->stream_encryption_dp, status: &status,
371 hdcp, str: "stream_encryption_dp"))
372 goto out;
373out:
374 return status;
375}
376
377static enum mod_hdcp_status determine_rx_hdcp_capable_dp(struct mod_hdcp *hdcp,
378 struct mod_hdcp_event_context *event_ctx,
379 struct mod_hdcp_transition_input_hdcp1 *input)
380{
381 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
382
383 if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
384 event_ctx->unexpected_event = 1;
385 goto out;
386 }
387
388 if (!mod_hdcp_execute_and_set(func: mod_hdcp_read_bcaps,
389 flag: &input->bcaps_read, status: &status,
390 hdcp, str: "bcaps_read"))
391 goto out;
392 if (!mod_hdcp_execute_and_set(func: check_hdcp_capable_dp,
393 flag: &input->hdcp_capable_dp, status: &status,
394 hdcp, str: "hdcp_capable_dp"))
395 goto out;
396out:
397 return status;
398}
399
400static enum mod_hdcp_status wait_for_r0_prime_dp(struct mod_hdcp *hdcp,
401 struct mod_hdcp_event_context *event_ctx,
402 struct mod_hdcp_transition_input_hdcp1 *input)
403{
404 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
405
406 if (event_ctx->event != MOD_HDCP_EVENT_CPIRQ &&
407 event_ctx->event != MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) {
408 event_ctx->unexpected_event = 1;
409 goto out;
410 }
411
412 if (!mod_hdcp_execute_and_set(func: mod_hdcp_read_bstatus,
413 flag: &input->bstatus_read, status: &status,
414 hdcp, str: "bstatus_read"))
415 goto out;
416 if (!mod_hdcp_execute_and_set(func: check_r0p_available_dp,
417 flag: &input->r0p_available_dp, status: &status,
418 hdcp, str: "r0p_available_dp"))
419 goto out;
420out:
421 return status;
422}
423
424static enum mod_hdcp_status authenticated_dp(struct mod_hdcp *hdcp,
425 struct mod_hdcp_event_context *event_ctx,
426 struct mod_hdcp_transition_input_hdcp1 *input)
427{
428 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
429
430 if (event_ctx->event != MOD_HDCP_EVENT_CPIRQ) {
431 event_ctx->unexpected_event = 1;
432 goto out;
433 }
434
435 if (status == MOD_HDCP_STATUS_SUCCESS)
436 mod_hdcp_execute_and_set(func: mod_hdcp_read_bstatus,
437 flag: &input->bstatus_read, status: &status,
438 hdcp, str: "bstatus_read");
439 if (status == MOD_HDCP_STATUS_SUCCESS)
440 mod_hdcp_execute_and_set(func: check_link_integrity_dp,
441 flag: &input->link_integrity_check, status: &status,
442 hdcp, str: "link_integrity_check");
443 if (status == MOD_HDCP_STATUS_SUCCESS)
444 mod_hdcp_execute_and_set(func: check_no_reauthentication_request_dp,
445 flag: &input->reauth_request_check, status: &status,
446 hdcp, str: "reauth_request_check");
447out:
448 return status;
449}
450
451uint8_t mod_hdcp_execute_and_set(
452 mod_hdcp_action func, uint8_t *flag,
453 enum mod_hdcp_status *status, struct mod_hdcp *hdcp, char *str)
454{
455 *status = func(hdcp);
456 if (*status == MOD_HDCP_STATUS_SUCCESS && *flag != PASS) {
457 HDCP_INPUT_PASS_TRACE(hdcp, str);
458 *flag = PASS;
459 } else if (*status != MOD_HDCP_STATUS_SUCCESS && *flag != FAIL) {
460 HDCP_INPUT_FAIL_TRACE(hdcp, str);
461 *flag = FAIL;
462 }
463 return (*status == MOD_HDCP_STATUS_SUCCESS);
464}
465
466enum mod_hdcp_status mod_hdcp_hdcp1_execution(struct mod_hdcp *hdcp,
467 struct mod_hdcp_event_context *event_ctx,
468 struct mod_hdcp_transition_input_hdcp1 *input)
469{
470 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
471
472 switch (current_state(hdcp)) {
473 case H1_A0_WAIT_FOR_ACTIVE_RX:
474 status = wait_for_active_rx(hdcp, event_ctx, input);
475 break;
476 case H1_A1_EXCHANGE_KSVS:
477 status = exchange_ksvs(hdcp, event_ctx, input);
478 break;
479 case H1_A2_COMPUTATIONS_A3_VALIDATE_RX_A6_TEST_FOR_REPEATER:
480 status = computations_validate_rx_test_for_repeater(hdcp,
481 event_ctx, input);
482 break;
483 case H1_A45_AUTHENTICATED:
484 status = authenticated(hdcp, event_ctx, input);
485 break;
486 case H1_A8_WAIT_FOR_READY:
487 status = wait_for_ready(hdcp, event_ctx, input);
488 break;
489 case H1_A9_READ_KSV_LIST:
490 status = read_ksv_list(hdcp, event_ctx, input);
491 break;
492 default:
493 status = MOD_HDCP_STATUS_INVALID_STATE;
494 break;
495 }
496
497 return status;
498}
499
500enum mod_hdcp_status mod_hdcp_hdcp1_dp_execution(struct mod_hdcp *hdcp,
501 struct mod_hdcp_event_context *event_ctx,
502 struct mod_hdcp_transition_input_hdcp1 *input)
503{
504 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
505
506 switch (current_state(hdcp)) {
507 case D1_A0_DETERMINE_RX_HDCP_CAPABLE:
508 status = determine_rx_hdcp_capable_dp(hdcp, event_ctx, input);
509 break;
510 case D1_A1_EXCHANGE_KSVS:
511 status = exchange_ksvs(hdcp, event_ctx, input);
512 break;
513 case D1_A23_WAIT_FOR_R0_PRIME:
514 status = wait_for_r0_prime_dp(hdcp, event_ctx, input);
515 break;
516 case D1_A2_COMPUTATIONS_A3_VALIDATE_RX_A5_TEST_FOR_REPEATER:
517 status = computations_validate_rx_test_for_repeater(
518 hdcp, event_ctx, input);
519 break;
520 case D1_A4_AUTHENTICATED:
521 status = authenticated_dp(hdcp, event_ctx, input);
522 break;
523 case D1_A6_WAIT_FOR_READY:
524 status = wait_for_ready(hdcp, event_ctx, input);
525 break;
526 case D1_A7_READ_KSV_LIST:
527 status = read_ksv_list(hdcp, event_ctx, input);
528 break;
529 default:
530 status = MOD_HDCP_STATUS_INVALID_STATE;
531 break;
532 }
533
534 return status;
535}
536

source code of linux/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c