1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright © 2019 Intel Corporation
4 *
5 * mei_hdcp.c: HDCP client driver for mei bus
6 *
7 * Author:
8 * Ramalingam C <ramalingam.c@intel.com>
9 */
10
11 /**
12 * DOC: MEI_HDCP Client Driver
13 *
14 * The mei_hdcp driver acts as a translation layer between HDCP 2.2
15 * protocol implementer (I915) and ME FW by translating HDCP2.2
16 * negotiation messages to ME FW command payloads and vice versa.
17 */
18
19 #include <linux/module.h>
20 #include <linux/pci.h>
21 #include <linux/slab.h>
22 #include <linux/mei.h>
23 #include <linux/mei_cl_bus.h>
24 #include <linux/component.h>
25 #include <drm/drm_connector.h>
26 #include <drm/intel/i915_component.h>
27 #include <drm/intel/i915_hdcp_interface.h>
28
29 #include "mei_hdcp.h"
30
31 /**
32 * mei_hdcp_initiate_session() - Initiate a Wired HDCP2.2 Tx Session in ME FW
33 * @dev: device corresponding to the mei_cl_device
34 * @data: Intel HW specific hdcp data
35 * @ake_data: AKE_Init msg output.
36 *
37 * Return: 0 on Success, <0 on Failure.
38 */
39 static int
mei_hdcp_initiate_session(struct device * dev,struct hdcp_port_data * data,struct hdcp2_ake_init * ake_data)40 mei_hdcp_initiate_session(struct device *dev, struct hdcp_port_data *data,
41 struct hdcp2_ake_init *ake_data)
42 {
43 struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 } };
44 struct wired_cmd_initiate_hdcp2_session_out
45 session_init_out = { { 0 } };
46 struct mei_cl_device *cldev;
47 ssize_t byte;
48
49 if (!dev || !data || !ake_data)
50 return -EINVAL;
51
52 cldev = to_mei_cl_device(dev);
53
54 session_init_in.header.api_version = HDCP_API_VERSION;
55 session_init_in.header.command_id = WIRED_INITIATE_HDCP2_SESSION;
56 session_init_in.header.status = FW_HDCP_STATUS_SUCCESS;
57 session_init_in.header.buffer_len =
58 WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_IN;
59
60 session_init_in.port.integrated_port_type = data->port_type;
61 session_init_in.port.physical_port = (u8)data->hdcp_ddi;
62 session_init_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
63 session_init_in.protocol = data->protocol;
64
65 byte = mei_cldev_send(cldev, (u8 *)&session_init_in,
66 sizeof(session_init_in));
67 if (byte < 0) {
68 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
69 return byte;
70 }
71
72 byte = mei_cldev_recv(cldev, (u8 *)&session_init_out,
73 sizeof(session_init_out));
74 if (byte < 0) {
75 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
76 return byte;
77 }
78
79 if (session_init_out.header.status != FW_HDCP_STATUS_SUCCESS) {
80 dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
81 WIRED_INITIATE_HDCP2_SESSION,
82 session_init_out.header.status);
83 return -EIO;
84 }
85
86 ake_data->msg_id = HDCP_2_2_AKE_INIT;
87 ake_data->tx_caps = session_init_out.tx_caps;
88 memcpy(ake_data->r_tx, session_init_out.r_tx, HDCP_2_2_RTX_LEN);
89
90 return 0;
91 }
92
93 /**
94 * mei_hdcp_verify_receiver_cert_prepare_km() - Verify the Receiver Certificate
95 * AKE_Send_Cert and prepare AKE_Stored_Km/AKE_No_Stored_Km
96 * @dev: device corresponding to the mei_cl_device
97 * @data: Intel HW specific hdcp data
98 * @rx_cert: AKE_Send_Cert for verification
99 * @km_stored: Pairing status flag output
100 * @ek_pub_km: AKE_Stored_Km/AKE_No_Stored_Km output msg
101 * @msg_sz : size of AKE_XXXXX_Km output msg
102 *
103 * Return: 0 on Success, <0 on Failure
104 */
105 static int
mei_hdcp_verify_receiver_cert_prepare_km(struct device * dev,struct hdcp_port_data * data,struct hdcp2_ake_send_cert * rx_cert,bool * km_stored,struct hdcp2_ake_no_stored_km * ek_pub_km,size_t * msg_sz)106 mei_hdcp_verify_receiver_cert_prepare_km(struct device *dev,
107 struct hdcp_port_data *data,
108 struct hdcp2_ake_send_cert *rx_cert,
109 bool *km_stored,
110 struct hdcp2_ake_no_stored_km
111 *ek_pub_km,
112 size_t *msg_sz)
113 {
114 struct wired_cmd_verify_receiver_cert_in verify_rxcert_in = { { 0 } };
115 struct wired_cmd_verify_receiver_cert_out verify_rxcert_out = { { 0 } };
116 struct mei_cl_device *cldev;
117 ssize_t byte;
118
119 if (!dev || !data || !rx_cert || !km_stored || !ek_pub_km || !msg_sz)
120 return -EINVAL;
121
122 cldev = to_mei_cl_device(dev);
123
124 verify_rxcert_in.header.api_version = HDCP_API_VERSION;
125 verify_rxcert_in.header.command_id = WIRED_VERIFY_RECEIVER_CERT;
126 verify_rxcert_in.header.status = FW_HDCP_STATUS_SUCCESS;
127 verify_rxcert_in.header.buffer_len =
128 WIRED_CMD_BUF_LEN_VERIFY_RECEIVER_CERT_IN;
129
130 verify_rxcert_in.port.integrated_port_type = data->port_type;
131 verify_rxcert_in.port.physical_port = (u8)data->hdcp_ddi;
132 verify_rxcert_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
133
134 verify_rxcert_in.cert_rx = rx_cert->cert_rx;
135 memcpy(verify_rxcert_in.r_rx, &rx_cert->r_rx, HDCP_2_2_RRX_LEN);
136 memcpy(verify_rxcert_in.rx_caps, rx_cert->rx_caps, HDCP_2_2_RXCAPS_LEN);
137
138 byte = mei_cldev_send(cldev, (u8 *)&verify_rxcert_in,
139 sizeof(verify_rxcert_in));
140 if (byte < 0) {
141 dev_dbg(dev, "mei_cldev_send failed: %zd\n", byte);
142 return byte;
143 }
144
145 byte = mei_cldev_recv(cldev, (u8 *)&verify_rxcert_out,
146 sizeof(verify_rxcert_out));
147 if (byte < 0) {
148 dev_dbg(dev, "mei_cldev_recv failed: %zd\n", byte);
149 return byte;
150 }
151
152 if (verify_rxcert_out.header.status != FW_HDCP_STATUS_SUCCESS) {
153 dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
154 WIRED_VERIFY_RECEIVER_CERT,
155 verify_rxcert_out.header.status);
156 return -EIO;
157 }
158
159 *km_stored = !!verify_rxcert_out.km_stored;
160 if (verify_rxcert_out.km_stored) {
161 ek_pub_km->msg_id = HDCP_2_2_AKE_STORED_KM;
162 *msg_sz = sizeof(struct hdcp2_ake_stored_km);
163 } else {
164 ek_pub_km->msg_id = HDCP_2_2_AKE_NO_STORED_KM;
165 *msg_sz = sizeof(struct hdcp2_ake_no_stored_km);
166 }
167
168 memcpy(ek_pub_km->e_kpub_km, &verify_rxcert_out.ekm_buff,
169 sizeof(verify_rxcert_out.ekm_buff));
170
171 return 0;
172 }
173
174 /**
175 * mei_hdcp_verify_hprime() - Verify AKE_Send_H_prime at ME FW.
176 * @dev: device corresponding to the mei_cl_device
177 * @data: Intel HW specific hdcp data
178 * @rx_hprime: AKE_Send_H_prime msg for ME FW verification
179 *
180 * Return: 0 on Success, <0 on Failure
181 */
182 static int
mei_hdcp_verify_hprime(struct device * dev,struct hdcp_port_data * data,struct hdcp2_ake_send_hprime * rx_hprime)183 mei_hdcp_verify_hprime(struct device *dev, struct hdcp_port_data *data,
184 struct hdcp2_ake_send_hprime *rx_hprime)
185 {
186 struct wired_cmd_ake_send_hprime_in send_hprime_in = { { 0 } };
187 struct wired_cmd_ake_send_hprime_out send_hprime_out = { { 0 } };
188 struct mei_cl_device *cldev;
189 ssize_t byte;
190
191 if (!dev || !data || !rx_hprime)
192 return -EINVAL;
193
194 cldev = to_mei_cl_device(dev);
195
196 send_hprime_in.header.api_version = HDCP_API_VERSION;
197 send_hprime_in.header.command_id = WIRED_AKE_SEND_HPRIME;
198 send_hprime_in.header.status = FW_HDCP_STATUS_SUCCESS;
199 send_hprime_in.header.buffer_len = WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_IN;
200
201 send_hprime_in.port.integrated_port_type = data->port_type;
202 send_hprime_in.port.physical_port = (u8)data->hdcp_ddi;
203 send_hprime_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
204
205 memcpy(send_hprime_in.h_prime, rx_hprime->h_prime,
206 HDCP_2_2_H_PRIME_LEN);
207
208 byte = mei_cldev_send(cldev, (u8 *)&send_hprime_in,
209 sizeof(send_hprime_in));
210 if (byte < 0) {
211 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
212 return byte;
213 }
214
215 byte = mei_cldev_recv(cldev, (u8 *)&send_hprime_out,
216 sizeof(send_hprime_out));
217 if (byte < 0) {
218 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
219 return byte;
220 }
221
222 if (send_hprime_out.header.status != FW_HDCP_STATUS_SUCCESS) {
223 dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
224 WIRED_AKE_SEND_HPRIME, send_hprime_out.header.status);
225 return -EIO;
226 }
227
228 return 0;
229 }
230
231 /**
232 * mei_hdcp_store_pairing_info() - Store pairing info received at ME FW
233 * @dev: device corresponding to the mei_cl_device
234 * @data: Intel HW specific hdcp data
235 * @pairing_info: AKE_Send_Pairing_Info msg input to ME FW
236 *
237 * Return: 0 on Success, <0 on Failure
238 */
239 static int
mei_hdcp_store_pairing_info(struct device * dev,struct hdcp_port_data * data,struct hdcp2_ake_send_pairing_info * pairing_info)240 mei_hdcp_store_pairing_info(struct device *dev, struct hdcp_port_data *data,
241 struct hdcp2_ake_send_pairing_info *pairing_info)
242 {
243 struct wired_cmd_ake_send_pairing_info_in pairing_info_in = { { 0 } };
244 struct wired_cmd_ake_send_pairing_info_out pairing_info_out = { { 0 } };
245 struct mei_cl_device *cldev;
246 ssize_t byte;
247
248 if (!dev || !data || !pairing_info)
249 return -EINVAL;
250
251 cldev = to_mei_cl_device(dev);
252
253 pairing_info_in.header.api_version = HDCP_API_VERSION;
254 pairing_info_in.header.command_id = WIRED_AKE_SEND_PAIRING_INFO;
255 pairing_info_in.header.status = FW_HDCP_STATUS_SUCCESS;
256 pairing_info_in.header.buffer_len =
257 WIRED_CMD_BUF_LEN_SEND_PAIRING_INFO_IN;
258
259 pairing_info_in.port.integrated_port_type = data->port_type;
260 pairing_info_in.port.physical_port = (u8)data->hdcp_ddi;
261 pairing_info_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
262
263 memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km,
264 HDCP_2_2_E_KH_KM_LEN);
265
266 byte = mei_cldev_send(cldev, (u8 *)&pairing_info_in,
267 sizeof(pairing_info_in));
268 if (byte < 0) {
269 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
270 return byte;
271 }
272
273 byte = mei_cldev_recv(cldev, (u8 *)&pairing_info_out,
274 sizeof(pairing_info_out));
275 if (byte < 0) {
276 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
277 return byte;
278 }
279
280 if (pairing_info_out.header.status != FW_HDCP_STATUS_SUCCESS) {
281 dev_dbg(dev, "ME cmd 0x%08X failed. Status: 0x%X\n",
282 WIRED_AKE_SEND_PAIRING_INFO,
283 pairing_info_out.header.status);
284 return -EIO;
285 }
286
287 return 0;
288 }
289
290 /**
291 * mei_hdcp_initiate_locality_check() - Prepare LC_Init
292 * @dev: device corresponding to the mei_cl_device
293 * @data: Intel HW specific hdcp data
294 * @lc_init_data: LC_Init msg output
295 *
296 * Return: 0 on Success, <0 on Failure
297 */
298 static int
mei_hdcp_initiate_locality_check(struct device * dev,struct hdcp_port_data * data,struct hdcp2_lc_init * lc_init_data)299 mei_hdcp_initiate_locality_check(struct device *dev,
300 struct hdcp_port_data *data,
301 struct hdcp2_lc_init *lc_init_data)
302 {
303 struct wired_cmd_init_locality_check_in lc_init_in = { { 0 } };
304 struct wired_cmd_init_locality_check_out lc_init_out = { { 0 } };
305 struct mei_cl_device *cldev;
306 ssize_t byte;
307
308 if (!dev || !data || !lc_init_data)
309 return -EINVAL;
310
311 cldev = to_mei_cl_device(dev);
312
313 lc_init_in.header.api_version = HDCP_API_VERSION;
314 lc_init_in.header.command_id = WIRED_INIT_LOCALITY_CHECK;
315 lc_init_in.header.status = FW_HDCP_STATUS_SUCCESS;
316 lc_init_in.header.buffer_len = WIRED_CMD_BUF_LEN_INIT_LOCALITY_CHECK_IN;
317
318 lc_init_in.port.integrated_port_type = data->port_type;
319 lc_init_in.port.physical_port = (u8)data->hdcp_ddi;
320 lc_init_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
321
322 byte = mei_cldev_send(cldev, (u8 *)&lc_init_in, sizeof(lc_init_in));
323 if (byte < 0) {
324 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
325 return byte;
326 }
327
328 byte = mei_cldev_recv(cldev, (u8 *)&lc_init_out, sizeof(lc_init_out));
329 if (byte < 0) {
330 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
331 return byte;
332 }
333
334 if (lc_init_out.header.status != FW_HDCP_STATUS_SUCCESS) {
335 dev_dbg(dev, "ME cmd 0x%08X Failed. status: 0x%X\n",
336 WIRED_INIT_LOCALITY_CHECK, lc_init_out.header.status);
337 return -EIO;
338 }
339
340 lc_init_data->msg_id = HDCP_2_2_LC_INIT;
341 memcpy(lc_init_data->r_n, lc_init_out.r_n, HDCP_2_2_RN_LEN);
342
343 return 0;
344 }
345
346 /**
347 * mei_hdcp_verify_lprime() - Verify lprime.
348 * @dev: device corresponding to the mei_cl_device
349 * @data: Intel HW specific hdcp data
350 * @rx_lprime: LC_Send_L_prime msg for ME FW verification
351 *
352 * Return: 0 on Success, <0 on Failure
353 */
354 static int
mei_hdcp_verify_lprime(struct device * dev,struct hdcp_port_data * data,struct hdcp2_lc_send_lprime * rx_lprime)355 mei_hdcp_verify_lprime(struct device *dev, struct hdcp_port_data *data,
356 struct hdcp2_lc_send_lprime *rx_lprime)
357 {
358 struct wired_cmd_validate_locality_in verify_lprime_in = { { 0 } };
359 struct wired_cmd_validate_locality_out verify_lprime_out = { { 0 } };
360 struct mei_cl_device *cldev;
361 ssize_t byte;
362
363 if (!dev || !data || !rx_lprime)
364 return -EINVAL;
365
366 cldev = to_mei_cl_device(dev);
367
368 verify_lprime_in.header.api_version = HDCP_API_VERSION;
369 verify_lprime_in.header.command_id = WIRED_VALIDATE_LOCALITY;
370 verify_lprime_in.header.status = FW_HDCP_STATUS_SUCCESS;
371 verify_lprime_in.header.buffer_len =
372 WIRED_CMD_BUF_LEN_VALIDATE_LOCALITY_IN;
373
374 verify_lprime_in.port.integrated_port_type = data->port_type;
375 verify_lprime_in.port.physical_port = (u8)data->hdcp_ddi;
376 verify_lprime_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
377
378 memcpy(verify_lprime_in.l_prime, rx_lprime->l_prime,
379 HDCP_2_2_L_PRIME_LEN);
380
381 byte = mei_cldev_send(cldev, (u8 *)&verify_lprime_in,
382 sizeof(verify_lprime_in));
383 if (byte < 0) {
384 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
385 return byte;
386 }
387
388 byte = mei_cldev_recv(cldev, (u8 *)&verify_lprime_out,
389 sizeof(verify_lprime_out));
390 if (byte < 0) {
391 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
392 return byte;
393 }
394
395 if (verify_lprime_out.header.status != FW_HDCP_STATUS_SUCCESS) {
396 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
397 WIRED_VALIDATE_LOCALITY,
398 verify_lprime_out.header.status);
399 return -EIO;
400 }
401
402 return 0;
403 }
404
405 /**
406 * mei_hdcp_get_session_key() - Prepare SKE_Send_Eks.
407 * @dev: device corresponding to the mei_cl_device
408 * @data: Intel HW specific hdcp data
409 * @ske_data: SKE_Send_Eks msg output from ME FW.
410 *
411 * Return: 0 on Success, <0 on Failure
412 */
mei_hdcp_get_session_key(struct device * dev,struct hdcp_port_data * data,struct hdcp2_ske_send_eks * ske_data)413 static int mei_hdcp_get_session_key(struct device *dev,
414 struct hdcp_port_data *data,
415 struct hdcp2_ske_send_eks *ske_data)
416 {
417 struct wired_cmd_get_session_key_in get_skey_in = { { 0 } };
418 struct wired_cmd_get_session_key_out get_skey_out = { { 0 } };
419 struct mei_cl_device *cldev;
420 ssize_t byte;
421
422 if (!dev || !data || !ske_data)
423 return -EINVAL;
424
425 cldev = to_mei_cl_device(dev);
426
427 get_skey_in.header.api_version = HDCP_API_VERSION;
428 get_skey_in.header.command_id = WIRED_GET_SESSION_KEY;
429 get_skey_in.header.status = FW_HDCP_STATUS_SUCCESS;
430 get_skey_in.header.buffer_len = WIRED_CMD_BUF_LEN_GET_SESSION_KEY_IN;
431
432 get_skey_in.port.integrated_port_type = data->port_type;
433 get_skey_in.port.physical_port = (u8)data->hdcp_ddi;
434 get_skey_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
435
436 byte = mei_cldev_send(cldev, (u8 *)&get_skey_in, sizeof(get_skey_in));
437 if (byte < 0) {
438 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
439 return byte;
440 }
441
442 byte = mei_cldev_recv(cldev, (u8 *)&get_skey_out, sizeof(get_skey_out));
443
444 if (byte < 0) {
445 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
446 return byte;
447 }
448
449 if (get_skey_out.header.status != FW_HDCP_STATUS_SUCCESS) {
450 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
451 WIRED_GET_SESSION_KEY, get_skey_out.header.status);
452 return -EIO;
453 }
454
455 ske_data->msg_id = HDCP_2_2_SKE_SEND_EKS;
456 memcpy(ske_data->e_dkey_ks, get_skey_out.e_dkey_ks,
457 HDCP_2_2_E_DKEY_KS_LEN);
458 memcpy(ske_data->riv, get_skey_out.r_iv, HDCP_2_2_RIV_LEN);
459
460 return 0;
461 }
462
463 /**
464 * mei_hdcp_repeater_check_flow_prepare_ack() - Validate the Downstream topology
465 * and prepare rep_ack.
466 * @dev: device corresponding to the mei_cl_device
467 * @data: Intel HW specific hdcp data
468 * @rep_topology: Receiver ID List to be validated
469 * @rep_send_ack : repeater ack from ME FW.
470 *
471 * Return: 0 on Success, <0 on Failure
472 */
473 static int
mei_hdcp_repeater_check_flow_prepare_ack(struct device * dev,struct hdcp_port_data * data,struct hdcp2_rep_send_receiverid_list * rep_topology,struct hdcp2_rep_send_ack * rep_send_ack)474 mei_hdcp_repeater_check_flow_prepare_ack(struct device *dev,
475 struct hdcp_port_data *data,
476 struct hdcp2_rep_send_receiverid_list
477 *rep_topology,
478 struct hdcp2_rep_send_ack
479 *rep_send_ack)
480 {
481 struct wired_cmd_verify_repeater_in verify_repeater_in = { { 0 } };
482 struct wired_cmd_verify_repeater_out verify_repeater_out = { { 0 } };
483 struct mei_cl_device *cldev;
484 ssize_t byte;
485
486 if (!dev || !rep_topology || !rep_send_ack || !data)
487 return -EINVAL;
488
489 cldev = to_mei_cl_device(dev);
490
491 verify_repeater_in.header.api_version = HDCP_API_VERSION;
492 verify_repeater_in.header.command_id = WIRED_VERIFY_REPEATER;
493 verify_repeater_in.header.status = FW_HDCP_STATUS_SUCCESS;
494 verify_repeater_in.header.buffer_len =
495 WIRED_CMD_BUF_LEN_VERIFY_REPEATER_IN;
496
497 verify_repeater_in.port.integrated_port_type = data->port_type;
498 verify_repeater_in.port.physical_port = (u8)data->hdcp_ddi;
499 verify_repeater_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
500
501 memcpy(verify_repeater_in.rx_info, rep_topology->rx_info,
502 HDCP_2_2_RXINFO_LEN);
503 memcpy(verify_repeater_in.seq_num_v, rep_topology->seq_num_v,
504 HDCP_2_2_SEQ_NUM_LEN);
505 memcpy(verify_repeater_in.v_prime, rep_topology->v_prime,
506 HDCP_2_2_V_PRIME_HALF_LEN);
507 memcpy(verify_repeater_in.receiver_ids, rep_topology->receiver_ids,
508 HDCP_2_2_RECEIVER_IDS_MAX_LEN);
509
510 byte = mei_cldev_send(cldev, (u8 *)&verify_repeater_in,
511 sizeof(verify_repeater_in));
512 if (byte < 0) {
513 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
514 return byte;
515 }
516
517 byte = mei_cldev_recv(cldev, (u8 *)&verify_repeater_out,
518 sizeof(verify_repeater_out));
519 if (byte < 0) {
520 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
521 return byte;
522 }
523
524 if (verify_repeater_out.header.status != FW_HDCP_STATUS_SUCCESS) {
525 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
526 WIRED_VERIFY_REPEATER,
527 verify_repeater_out.header.status);
528 return -EIO;
529 }
530
531 memcpy(rep_send_ack->v, verify_repeater_out.v,
532 HDCP_2_2_V_PRIME_HALF_LEN);
533 rep_send_ack->msg_id = HDCP_2_2_REP_SEND_ACK;
534
535 return 0;
536 }
537
538 /**
539 * mei_hdcp_verify_mprime() - Verify mprime.
540 * @dev: device corresponding to the mei_cl_device
541 * @data: Intel HW specific hdcp data
542 * @stream_ready: RepeaterAuth_Stream_Ready msg for ME FW verification.
543 *
544 * Return: 0 on Success, <0 on Failure
545 */
mei_hdcp_verify_mprime(struct device * dev,struct hdcp_port_data * data,struct hdcp2_rep_stream_ready * stream_ready)546 static int mei_hdcp_verify_mprime(struct device *dev,
547 struct hdcp_port_data *data,
548 struct hdcp2_rep_stream_ready *stream_ready)
549 {
550 struct wired_cmd_repeater_auth_stream_req_in *verify_mprime_in;
551 struct wired_cmd_repeater_auth_stream_req_out
552 verify_mprime_out = { { 0 } };
553 struct mei_cl_device *cldev;
554 ssize_t byte;
555 size_t cmd_size;
556
557 if (!dev || !stream_ready || !data)
558 return -EINVAL;
559
560 cldev = to_mei_cl_device(dev);
561
562 cmd_size = struct_size(verify_mprime_in, streams, data->k);
563 if (cmd_size == SIZE_MAX)
564 return -EINVAL;
565
566 verify_mprime_in = kzalloc(cmd_size, GFP_KERNEL);
567 if (!verify_mprime_in)
568 return -ENOMEM;
569
570 verify_mprime_in->header.api_version = HDCP_API_VERSION;
571 verify_mprime_in->header.command_id = WIRED_REPEATER_AUTH_STREAM_REQ;
572 verify_mprime_in->header.status = FW_HDCP_STATUS_SUCCESS;
573 verify_mprime_in->header.buffer_len = cmd_size - sizeof(verify_mprime_in->header);
574
575 verify_mprime_in->port.integrated_port_type = data->port_type;
576 verify_mprime_in->port.physical_port = (u8)data->hdcp_ddi;
577 verify_mprime_in->port.attached_transcoder = (u8)data->hdcp_transcoder;
578
579 memcpy(verify_mprime_in->m_prime, stream_ready->m_prime, HDCP_2_2_MPRIME_LEN);
580 drm_hdcp_cpu_to_be24(verify_mprime_in->seq_num_m, data->seq_num_m);
581
582 memcpy(verify_mprime_in->streams, data->streams,
583 array_size(data->k, sizeof(*data->streams)));
584
585 verify_mprime_in->k = cpu_to_be16(data->k);
586
587 byte = mei_cldev_send(cldev, (u8 *)verify_mprime_in, cmd_size);
588 kfree(verify_mprime_in);
589 if (byte < 0) {
590 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
591 return byte;
592 }
593
594 byte = mei_cldev_recv(cldev, (u8 *)&verify_mprime_out,
595 sizeof(verify_mprime_out));
596 if (byte < 0) {
597 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
598 return byte;
599 }
600
601 if (verify_mprime_out.header.status != FW_HDCP_STATUS_SUCCESS) {
602 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
603 WIRED_REPEATER_AUTH_STREAM_REQ,
604 verify_mprime_out.header.status);
605 return -EIO;
606 }
607
608 return 0;
609 }
610
611 /**
612 * mei_hdcp_enable_authentication() - Mark a port as authenticated
613 * through ME FW
614 * @dev: device corresponding to the mei_cl_device
615 * @data: Intel HW specific hdcp data
616 *
617 * Return: 0 on Success, <0 on Failure
618 */
mei_hdcp_enable_authentication(struct device * dev,struct hdcp_port_data * data)619 static int mei_hdcp_enable_authentication(struct device *dev,
620 struct hdcp_port_data *data)
621 {
622 struct wired_cmd_enable_auth_in enable_auth_in = { { 0 } };
623 struct wired_cmd_enable_auth_out enable_auth_out = { { 0 } };
624 struct mei_cl_device *cldev;
625 ssize_t byte;
626
627 if (!dev || !data)
628 return -EINVAL;
629
630 cldev = to_mei_cl_device(dev);
631
632 enable_auth_in.header.api_version = HDCP_API_VERSION;
633 enable_auth_in.header.command_id = WIRED_ENABLE_AUTH;
634 enable_auth_in.header.status = FW_HDCP_STATUS_SUCCESS;
635 enable_auth_in.header.buffer_len = WIRED_CMD_BUF_LEN_ENABLE_AUTH_IN;
636
637 enable_auth_in.port.integrated_port_type = data->port_type;
638 enable_auth_in.port.physical_port = (u8)data->hdcp_ddi;
639 enable_auth_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
640 enable_auth_in.stream_type = data->streams[0].stream_type;
641
642 byte = mei_cldev_send(cldev, (u8 *)&enable_auth_in,
643 sizeof(enable_auth_in));
644 if (byte < 0) {
645 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
646 return byte;
647 }
648
649 byte = mei_cldev_recv(cldev, (u8 *)&enable_auth_out,
650 sizeof(enable_auth_out));
651 if (byte < 0) {
652 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
653 return byte;
654 }
655
656 if (enable_auth_out.header.status != FW_HDCP_STATUS_SUCCESS) {
657 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
658 WIRED_ENABLE_AUTH, enable_auth_out.header.status);
659 return -EIO;
660 }
661
662 return 0;
663 }
664
665 /**
666 * mei_hdcp_close_session() - Close the Wired HDCP Tx session of ME FW per port.
667 * This also disables the authenticated state of the port.
668 * @dev: device corresponding to the mei_cl_device
669 * @data: Intel HW specific hdcp data
670 *
671 * Return: 0 on Success, <0 on Failure
672 */
673 static int
mei_hdcp_close_session(struct device * dev,struct hdcp_port_data * data)674 mei_hdcp_close_session(struct device *dev, struct hdcp_port_data *data)
675 {
676 struct wired_cmd_close_session_in session_close_in = { { 0 } };
677 struct wired_cmd_close_session_out session_close_out = { { 0 } };
678 struct mei_cl_device *cldev;
679 ssize_t byte;
680
681 if (!dev || !data)
682 return -EINVAL;
683
684 cldev = to_mei_cl_device(dev);
685
686 session_close_in.header.api_version = HDCP_API_VERSION;
687 session_close_in.header.command_id = WIRED_CLOSE_SESSION;
688 session_close_in.header.status = FW_HDCP_STATUS_SUCCESS;
689 session_close_in.header.buffer_len =
690 WIRED_CMD_BUF_LEN_CLOSE_SESSION_IN;
691
692 session_close_in.port.integrated_port_type = data->port_type;
693 session_close_in.port.physical_port = (u8)data->hdcp_ddi;
694 session_close_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
695
696 byte = mei_cldev_send(cldev, (u8 *)&session_close_in,
697 sizeof(session_close_in));
698 if (byte < 0) {
699 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
700 return byte;
701 }
702
703 byte = mei_cldev_recv(cldev, (u8 *)&session_close_out,
704 sizeof(session_close_out));
705 if (byte < 0) {
706 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
707 return byte;
708 }
709
710 if (session_close_out.header.status != FW_HDCP_STATUS_SUCCESS) {
711 dev_dbg(dev, "Session Close Failed. status: 0x%X\n",
712 session_close_out.header.status);
713 return -EIO;
714 }
715
716 return 0;
717 }
718
719 static const struct i915_hdcp_ops mei_hdcp_ops = {
720 .owner = THIS_MODULE,
721 .initiate_hdcp2_session = mei_hdcp_initiate_session,
722 .verify_receiver_cert_prepare_km =
723 mei_hdcp_verify_receiver_cert_prepare_km,
724 .verify_hprime = mei_hdcp_verify_hprime,
725 .store_pairing_info = mei_hdcp_store_pairing_info,
726 .initiate_locality_check = mei_hdcp_initiate_locality_check,
727 .verify_lprime = mei_hdcp_verify_lprime,
728 .get_session_key = mei_hdcp_get_session_key,
729 .repeater_check_flow_prepare_ack =
730 mei_hdcp_repeater_check_flow_prepare_ack,
731 .verify_mprime = mei_hdcp_verify_mprime,
732 .enable_hdcp_authentication = mei_hdcp_enable_authentication,
733 .close_hdcp_session = mei_hdcp_close_session,
734 };
735
mei_component_master_bind(struct device * dev)736 static int mei_component_master_bind(struct device *dev)
737 {
738 struct mei_cl_device *cldev = to_mei_cl_device(dev);
739 struct i915_hdcp_arbiter *comp_arbiter = mei_cldev_get_drvdata(cldev);
740 int ret;
741
742 dev_dbg(dev, "%s\n", __func__);
743 comp_arbiter->ops = &mei_hdcp_ops;
744 comp_arbiter->hdcp_dev = dev;
745 ret = component_bind_all(dev, comp_arbiter);
746 if (ret < 0)
747 return ret;
748
749 return 0;
750 }
751
mei_component_master_unbind(struct device * dev)752 static void mei_component_master_unbind(struct device *dev)
753 {
754 struct mei_cl_device *cldev = to_mei_cl_device(dev);
755 struct i915_hdcp_arbiter *comp_arbiter = mei_cldev_get_drvdata(cldev);
756
757 dev_dbg(dev, "%s\n", __func__);
758 component_unbind_all(dev, comp_arbiter);
759 }
760
761 static const struct component_master_ops mei_component_master_ops = {
762 .bind = mei_component_master_bind,
763 .unbind = mei_component_master_unbind,
764 };
765
766 /**
767 * mei_hdcp_component_match - compare function for matching mei hdcp.
768 *
769 * The function checks if the driver is i915, the subcomponent is HDCP
770 * and the grand parent of hdcp and the parent of i915 are the same
771 * PCH device.
772 *
773 * @dev: master device
774 * @subcomponent: subcomponent to match (I915_COMPONENT_HDCP)
775 * @data: compare data (mei hdcp device)
776 *
777 * Return:
778 * * 1 - if components match
779 * * 0 - otherwise
780 */
mei_hdcp_component_match(struct device * dev,int subcomponent,void * data)781 static int mei_hdcp_component_match(struct device *dev, int subcomponent,
782 void *data)
783 {
784 struct device *base = data;
785 struct pci_dev *pdev;
786
787 if (!dev_is_pci(dev))
788 return 0;
789
790 pdev = to_pci_dev(dev);
791
792 if (pdev->class != (PCI_CLASS_DISPLAY_VGA << 8) ||
793 pdev->vendor != PCI_VENDOR_ID_INTEL)
794 return 0;
795
796 if (subcomponent != I915_COMPONENT_HDCP)
797 return 0;
798
799 base = base->parent;
800 if (!base)
801 return 0;
802
803 base = base->parent;
804 dev = dev->parent;
805
806 return (base && dev && dev == base);
807 }
808
mei_hdcp_probe(struct mei_cl_device * cldev,const struct mei_cl_device_id * id)809 static int mei_hdcp_probe(struct mei_cl_device *cldev,
810 const struct mei_cl_device_id *id)
811 {
812 struct i915_hdcp_arbiter *comp_arbiter;
813 struct component_match *master_match;
814 int ret;
815
816 ret = mei_cldev_enable(cldev);
817 if (ret < 0) {
818 dev_err(&cldev->dev, "mei_cldev_enable Failed. %d\n", ret);
819 goto enable_err_exit;
820 }
821
822 comp_arbiter = kzalloc(sizeof(*comp_arbiter), GFP_KERNEL);
823 if (!comp_arbiter) {
824 ret = -ENOMEM;
825 goto err_exit;
826 }
827
828 master_match = NULL;
829 component_match_add_typed(&cldev->dev, &master_match,
830 mei_hdcp_component_match, &cldev->dev);
831 if (IS_ERR_OR_NULL(master_match)) {
832 ret = -ENOMEM;
833 goto err_exit;
834 }
835
836 mei_cldev_set_drvdata(cldev, comp_arbiter);
837 ret = component_master_add_with_match(&cldev->dev,
838 &mei_component_master_ops,
839 master_match);
840 if (ret < 0) {
841 dev_err(&cldev->dev, "Master comp add failed %d\n", ret);
842 goto err_exit;
843 }
844
845 return 0;
846
847 err_exit:
848 mei_cldev_set_drvdata(cldev, NULL);
849 kfree(comp_arbiter);
850 mei_cldev_disable(cldev);
851 enable_err_exit:
852 return ret;
853 }
854
mei_hdcp_remove(struct mei_cl_device * cldev)855 static void mei_hdcp_remove(struct mei_cl_device *cldev)
856 {
857 struct i915_hdcp_arbiter *comp_arbiter = mei_cldev_get_drvdata(cldev);
858 int ret;
859
860 component_master_del(&cldev->dev, &mei_component_master_ops);
861 kfree(comp_arbiter);
862 mei_cldev_set_drvdata(cldev, NULL);
863
864 ret = mei_cldev_disable(cldev);
865 if (ret)
866 dev_warn(&cldev->dev, "mei_cldev_disable() failed\n");
867 }
868
869 #define MEI_UUID_HDCP UUID_LE(0xB638AB7E, 0x94E2, 0x4EA2, 0xA5, \
870 0x52, 0xD1, 0xC5, 0x4B, 0x62, 0x7F, 0x04)
871
872 static const struct mei_cl_device_id mei_hdcp_tbl[] = {
873 { .uuid = MEI_UUID_HDCP, .version = MEI_CL_VERSION_ANY },
874 { }
875 };
876 MODULE_DEVICE_TABLE(mei, mei_hdcp_tbl);
877
878 static struct mei_cl_driver mei_hdcp_driver = {
879 .id_table = mei_hdcp_tbl,
880 .name = KBUILD_MODNAME,
881 .probe = mei_hdcp_probe,
882 .remove = mei_hdcp_remove,
883 };
884
885 module_mei_cl_driver(mei_hdcp_driver);
886
887 MODULE_AUTHOR("Intel Corporation");
888 MODULE_LICENSE("GPL");
889 MODULE_DESCRIPTION("MEI HDCP");
890