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/slab.h> 21#include <linux/uuid.h> 22#include <linux/mei_cl_bus.h> 23#include <linux/component.h> 24#include <drm/drm_connector.h> 25#include <drm/i915_component.h> 26#include <drm/i915_mei_hdcp_interface.h> 27 28#include "mei_hdcp.h" 29 30/** 31 * mei_hdcp_initiate_session() - Initiate a Wired HDCP2.2 Tx Session in ME FW 32 * @dev: device corresponding to the mei_cl_device 33 * @data: Intel HW specific hdcp data 34 * @ake_data: AKE_Init msg output. 35 * 36 * Return: 0 on Success, <0 on Failure. 37 */ 38static int 39mei_hdcp_initiate_session(struct device *dev, struct hdcp_port_data *data, 40 struct hdcp2_ake_init *ake_data) 41{ 42 struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 } }; 43 struct wired_cmd_initiate_hdcp2_session_out 44 session_init_out = { { 0 } }; 45 struct mei_cl_device *cldev; 46 ssize_t byte; 47 48 if (!dev || !data || !ake_data) 49 return -EINVAL; 50 51 cldev = to_mei_cl_device(dev); 52 53 session_init_in.header.api_version = HDCP_API_VERSION; 54 session_init_in.header.command_id = WIRED_INITIATE_HDCP2_SESSION; 55 session_init_in.header.status = ME_HDCP_STATUS_SUCCESS; 56 session_init_in.header.buffer_len = 57 WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_IN; 58 59 session_init_in.port.integrated_port_type = data->port_type; 60 session_init_in.port.physical_port = (u8)data->fw_ddi; 61 session_init_in.port.attached_transcoder = (u8)data->fw_tc; 62 session_init_in.protocol = data->protocol; 63 64 byte = mei_cldev_send(cldev, (u8 *)&session_init_in, 65 sizeof(session_init_in)); 66 if (byte < 0) { 67 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte); 68 return byte; 69 } 70 71 byte = mei_cldev_recv(cldev, (u8 *)&session_init_out, 72 sizeof(session_init_out)); 73 if (byte < 0) { 74 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte); 75 return byte; 76 } 77 78 if (session_init_out.header.status != ME_HDCP_STATUS_SUCCESS) { 79 dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n", 80 WIRED_INITIATE_HDCP2_SESSION, 81 session_init_out.header.status); 82 return -EIO; 83 } 84 85 ake_data->msg_id = HDCP_2_2_AKE_INIT; 86 ake_data->tx_caps = session_init_out.tx_caps; 87 memcpy(ake_data->r_tx, session_init_out.r_tx, HDCP_2_2_RTX_LEN); 88 89 return 0; 90} 91 92/** 93 * mei_hdcp_verify_receiver_cert_prepare_km() - Verify the Receiver Certificate 94 * AKE_Send_Cert and prepare AKE_Stored_Km/AKE_No_Stored_Km 95 * @dev: device corresponding to the mei_cl_device 96 * @data: Intel HW specific hdcp data 97 * @rx_cert: AKE_Send_Cert for verification 98 * @km_stored: Pairing status flag output 99 * @ek_pub_km: AKE_Stored_Km/AKE_No_Stored_Km output msg 100 * @msg_sz : size of AKE_XXXXX_Km output msg 101 * 102 * Return: 0 on Success, <0 on Failure 103 */ 104static int 105mei_hdcp_verify_receiver_cert_prepare_km(struct device *dev, 106 struct hdcp_port_data *data, 107 struct hdcp2_ake_send_cert *rx_cert, 108 bool *km_stored, 109 struct hdcp2_ake_no_stored_km 110 *ek_pub_km, 111 size_t *msg_sz) 112{ 113 struct wired_cmd_verify_receiver_cert_in verify_rxcert_in = { { 0 } }; 114 struct wired_cmd_verify_receiver_cert_out verify_rxcert_out = { { 0 } }; 115 struct mei_cl_device *cldev; 116 ssize_t byte; 117 118 if (!dev || !data || !rx_cert || !km_stored || !ek_pub_km || !msg_sz) 119 return -EINVAL; 120 121 cldev = to_mei_cl_device(dev); 122 123 verify_rxcert_in.header.api_version = HDCP_API_VERSION; 124 verify_rxcert_in.header.command_id = WIRED_VERIFY_RECEIVER_CERT; 125 verify_rxcert_in.header.status = ME_HDCP_STATUS_SUCCESS; 126 verify_rxcert_in.header.buffer_len = 127 WIRED_CMD_BUF_LEN_VERIFY_RECEIVER_CERT_IN; 128 129 verify_rxcert_in.port.integrated_port_type = data->port_type; 130 verify_rxcert_in.port.physical_port = (u8)data->fw_ddi; 131 verify_rxcert_in.port.attached_transcoder = (u8)data->fw_tc; 132 133 verify_rxcert_in.cert_rx = rx_cert->cert_rx; 134 memcpy(verify_rxcert_in.r_rx, &rx_cert->r_rx, HDCP_2_2_RRX_LEN); 135 memcpy(verify_rxcert_in.rx_caps, rx_cert->rx_caps, HDCP_2_2_RXCAPS_LEN); 136 137 byte = mei_cldev_send(cldev, (u8 *)&verify_rxcert_in, 138 sizeof(verify_rxcert_in)); 139 if (byte < 0) { 140 dev_dbg(dev, "mei_cldev_send failed: %zd\n", byte); 141 return byte; 142 } 143 144 byte = mei_cldev_recv(cldev, (u8 *)&verify_rxcert_out, 145 sizeof(verify_rxcert_out)); 146 if (byte < 0) { 147 dev_dbg(dev, "mei_cldev_recv failed: %zd\n", byte); 148 return byte; 149 } 150 151 if (verify_rxcert_out.header.status != ME_HDCP_STATUS_SUCCESS) { 152 dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n", 153 WIRED_VERIFY_RECEIVER_CERT, 154 verify_rxcert_out.header.status); 155 return -EIO; 156 } 157 158 *km_stored = !!verify_rxcert_out.km_stored; 159 if (verify_rxcert_out.km_stored) { 160 ek_pub_km->msg_id = HDCP_2_2_AKE_STORED_KM; 161 *msg_sz = sizeof(struct hdcp2_ake_stored_km); 162 } else { 163 ek_pub_km->msg_id = HDCP_2_2_AKE_NO_STORED_KM; 164 *msg_sz = sizeof(struct hdcp2_ake_no_stored_km); 165 } 166 167 memcpy(ek_pub_km->e_kpub_km, &verify_rxcert_out.ekm_buff, 168 sizeof(verify_rxcert_out.ekm_buff)); 169 170 return 0; 171} 172 173/** 174 * mei_hdcp_verify_hprime() - Verify AKE_Send_H_prime at ME FW. 175 * @dev: device corresponding to the mei_cl_device 176 * @data: Intel HW specific hdcp data 177 * @rx_hprime: AKE_Send_H_prime msg for ME FW verification 178 * 179 * Return: 0 on Success, <0 on Failure 180 */ 181static int 182mei_hdcp_verify_hprime(struct device *dev, struct hdcp_port_data *data, 183 struct hdcp2_ake_send_hprime *rx_hprime) 184{ 185 struct wired_cmd_ake_send_hprime_in send_hprime_in = { { 0 } }; 186 struct wired_cmd_ake_send_hprime_out send_hprime_out = { { 0 } }; 187 struct mei_cl_device *cldev; 188 ssize_t byte; 189 190 if (!dev || !data || !rx_hprime) 191 return -EINVAL; 192 193 cldev = to_mei_cl_device(dev); 194 195 send_hprime_in.header.api_version = HDCP_API_VERSION; 196 send_hprime_in.header.command_id = WIRED_AKE_SEND_HPRIME; 197 send_hprime_in.header.status = ME_HDCP_STATUS_SUCCESS; 198 send_hprime_in.header.buffer_len = WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_IN; 199 200 send_hprime_in.port.integrated_port_type = data->port_type; 201 send_hprime_in.port.physical_port = (u8)data->fw_ddi; 202 send_hprime_in.port.attached_transcoder = (u8)data->fw_tc; 203 204 memcpy(send_hprime_in.h_prime, rx_hprime->h_prime, 205 HDCP_2_2_H_PRIME_LEN); 206 207 byte = mei_cldev_send(cldev, (u8 *)&send_hprime_in, 208 sizeof(send_hprime_in)); 209 if (byte < 0) { 210 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte); 211 return byte; 212 } 213 214 byte = mei_cldev_recv(cldev, (u8 *)&send_hprime_out, 215 sizeof(send_hprime_out)); 216 if (byte < 0) { 217 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte); 218 return byte; 219 } 220 221 if (send_hprime_out.header.status != ME_HDCP_STATUS_SUCCESS) { 222 dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n", 223 WIRED_AKE_SEND_HPRIME, send_hprime_out.header.status); 224 return -EIO; 225 } 226 227 return 0; 228} 229 230/** 231 * mei_hdcp_store_pairing_info() - Store pairing info received at ME FW 232 * @dev: device corresponding to the mei_cl_device 233 * @data: Intel HW specific hdcp data 234 * @pairing_info: AKE_Send_Pairing_Info msg input to ME FW 235 * 236 * Return: 0 on Success, <0 on Failure 237 */ 238static int 239mei_hdcp_store_pairing_info(struct device *dev, struct hdcp_port_data *data, 240 struct hdcp2_ake_send_pairing_info *pairing_info) 241{ 242 struct wired_cmd_ake_send_pairing_info_in pairing_info_in = { { 0 } }; 243 struct wired_cmd_ake_send_pairing_info_out pairing_info_out = { { 0 } }; 244 struct mei_cl_device *cldev; 245 ssize_t byte; 246 247 if (!dev || !data || !pairing_info) 248 return -EINVAL; 249 250 cldev = to_mei_cl_device(dev); 251 252 pairing_info_in.header.api_version = HDCP_API_VERSION; 253 pairing_info_in.header.command_id = WIRED_AKE_SEND_PAIRING_INFO; 254 pairing_info_in.header.status = ME_HDCP_STATUS_SUCCESS; 255 pairing_info_in.header.buffer_len = 256 WIRED_CMD_BUF_LEN_SEND_PAIRING_INFO_IN; 257 258 pairing_info_in.port.integrated_port_type = data->port_type; 259 pairing_info_in.port.physical_port = (u8)data->fw_ddi; 260 pairing_info_in.port.attached_transcoder = (u8)data->fw_tc; 261 262 memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km, 263 HDCP_2_2_E_KH_KM_LEN); 264 265 byte = mei_cldev_send(cldev, (u8 *)&pairing_info_in, 266 sizeof(pairing_info_in)); 267 if (byte < 0) { 268 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte); 269 return byte; 270 } 271 272 byte = mei_cldev_recv(cldev, (u8 *)&pairing_info_out, 273 sizeof(pairing_info_out)); 274 if (byte < 0) { 275 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte); 276 return byte; 277 } 278 279 if (pairing_info_out.header.status != ME_HDCP_STATUS_SUCCESS) { 280 dev_dbg(dev, "ME cmd 0x%08X failed. Status: 0x%X\n", 281 WIRED_AKE_SEND_PAIRING_INFO, 282 pairing_info_out.header.status); 283 return -EIO; 284 } 285 286 return 0; 287} 288 289/** 290 * mei_hdcp_initiate_locality_check() - Prepare LC_Init 291 * @dev: device corresponding to the mei_cl_device 292 * @data: Intel HW specific hdcp data 293 * @lc_init_data: LC_Init msg output 294 * 295 * Return: 0 on Success, <0 on Failure 296 */ 297static int 298mei_hdcp_initiate_locality_check(struct device *dev, 299 struct hdcp_port_data *data, 300 struct hdcp2_lc_init *lc_init_data) 301{ 302 struct wired_cmd_init_locality_check_in lc_init_in = { { 0 } }; 303 struct wired_cmd_init_locality_check_out lc_init_out = { { 0 } }; 304 struct mei_cl_device *cldev; 305 ssize_t byte; 306 307 if (!dev || !data || !lc_init_data) 308 return -EINVAL; 309 310 cldev = to_mei_cl_device(dev); 311 312 lc_init_in.header.api_version = HDCP_API_VERSION; 313 lc_init_in.header.command_id = WIRED_INIT_LOCALITY_CHECK; 314 lc_init_in.header.status = ME_HDCP_STATUS_SUCCESS; 315 lc_init_in.header.buffer_len = WIRED_CMD_BUF_LEN_INIT_LOCALITY_CHECK_IN; 316 317 lc_init_in.port.integrated_port_type = data->port_type; 318 lc_init_in.port.physical_port = (u8)data->fw_ddi; 319 lc_init_in.port.attached_transcoder = (u8)data->fw_tc; 320 321 byte = mei_cldev_send(cldev, (u8 *)&lc_init_in, sizeof(lc_init_in)); 322 if (byte < 0) { 323 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte); 324 return byte; 325 } 326 327 byte = mei_cldev_recv(cldev, (u8 *)&lc_init_out, sizeof(lc_init_out)); 328 if (byte < 0) { 329 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte); 330 return byte; 331 } 332 333 if (lc_init_out.header.status != ME_HDCP_STATUS_SUCCESS) { 334 dev_dbg(dev, "ME cmd 0x%08X Failed. status: 0x%X\n", 335 WIRED_INIT_LOCALITY_CHECK, lc_init_out.header.status); 336 return -EIO; 337 } 338 339 lc_init_data->msg_id = HDCP_2_2_LC_INIT; 340 memcpy(lc_init_data->r_n, lc_init_out.r_n, HDCP_2_2_RN_LEN); 341 342 return 0; 343} 344 345/** 346 * mei_hdcp_verify_lprime() - Verify lprime. 347 * @dev: device corresponding to the mei_cl_device 348 * @data: Intel HW specific hdcp data 349 * @rx_lprime: LC_Send_L_prime msg for ME FW verification 350 * 351 * Return: 0 on Success, <0 on Failure 352 */ 353static int 354mei_hdcp_verify_lprime(struct device *dev, struct hdcp_port_data *data, 355 struct hdcp2_lc_send_lprime *rx_lprime) 356{ 357 struct wired_cmd_validate_locality_in verify_lprime_in = { { 0 } }; 358 struct wired_cmd_validate_locality_out verify_lprime_out = { { 0 } }; 359 struct mei_cl_device *cldev; 360 ssize_t byte; 361 362 if (!dev || !data || !rx_lprime) 363 return -EINVAL; 364 365 cldev = to_mei_cl_device(dev); 366 367 verify_lprime_in.header.api_version = HDCP_API_VERSION; 368 verify_lprime_in.header.command_id = WIRED_VALIDATE_LOCALITY; 369 verify_lprime_in.header.status = ME_HDCP_STATUS_SUCCESS; 370 verify_lprime_in.header.buffer_len = 371 WIRED_CMD_BUF_LEN_VALIDATE_LOCALITY_IN; 372 373 verify_lprime_in.port.integrated_port_type = data->port_type; 374 verify_lprime_in.port.physical_port = (u8)data->fw_ddi; 375 verify_lprime_in.port.attached_transcoder = (u8)data->fw_tc; 376 377 memcpy(verify_lprime_in.l_prime, rx_lprime->l_prime, 378 HDCP_2_2_L_PRIME_LEN); 379 380 byte = mei_cldev_send(cldev, (u8 *)&verify_lprime_in, 381 sizeof(verify_lprime_in)); 382 if (byte < 0) { 383 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte); 384 return byte; 385 } 386 387 byte = mei_cldev_recv(cldev, (u8 *)&verify_lprime_out, 388 sizeof(verify_lprime_out)); 389 if (byte < 0) { 390 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte); 391 return byte; 392 } 393 394 if (verify_lprime_out.header.status != ME_HDCP_STATUS_SUCCESS) { 395 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n", 396 WIRED_VALIDATE_LOCALITY, 397 verify_lprime_out.header.status); 398 return -EIO; 399 } 400 401 return 0; 402} 403 404/** 405 * mei_hdcp_get_session_key() - Prepare SKE_Send_Eks. 406 * @dev: device corresponding to the mei_cl_device 407 * @data: Intel HW specific hdcp data 408 * @ske_data: SKE_Send_Eks msg output from ME FW. 409 * 410 * Return: 0 on Success, <0 on Failure 411 */ 412static int mei_hdcp_get_session_key(struct device *dev, 413 struct hdcp_port_data *data, 414 struct hdcp2_ske_send_eks *ske_data) 415{ 416 struct wired_cmd_get_session_key_in get_skey_in = { { 0 } }; 417 struct wired_cmd_get_session_key_out get_skey_out = { { 0 } }; 418 struct mei_cl_device *cldev; 419 ssize_t byte; 420 421 if (!dev || !data || !ske_data) 422 return -EINVAL; 423 424 cldev = to_mei_cl_device(dev); 425 426 get_skey_in.header.api_version = HDCP_API_VERSION; 427 get_skey_in.header.command_id = WIRED_GET_SESSION_KEY; 428 get_skey_in.header.status = ME_HDCP_STATUS_SUCCESS; 429 get_skey_in.header.buffer_len = WIRED_CMD_BUF_LEN_GET_SESSION_KEY_IN; 430 431 get_skey_in.port.integrated_port_type = data->port_type; 432 get_skey_in.port.physical_port = (u8)data->fw_ddi; 433 get_skey_in.port.attached_transcoder = (u8)data->fw_tc; 434 435 byte = mei_cldev_send(cldev, (u8 *)&get_skey_in, sizeof(get_skey_in)); 436 if (byte < 0) { 437 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte); 438 return byte; 439 } 440 441 byte = mei_cldev_recv(cldev, (u8 *)&get_skey_out, sizeof(get_skey_out)); 442 443 if (byte < 0) { 444 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte); 445 return byte; 446 } 447 448 if (get_skey_out.header.status != ME_HDCP_STATUS_SUCCESS) { 449 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n", 450 WIRED_GET_SESSION_KEY, get_skey_out.header.status); 451 return -EIO; 452 } 453 454 ske_data->msg_id = HDCP_2_2_SKE_SEND_EKS; 455 memcpy(ske_data->e_dkey_ks, get_skey_out.e_dkey_ks, 456 HDCP_2_2_E_DKEY_KS_LEN); 457 memcpy(ske_data->riv, get_skey_out.r_iv, HDCP_2_2_RIV_LEN); 458 459 return 0; 460} 461 462/** 463 * mei_hdcp_repeater_check_flow_prepare_ack() - Validate the Downstream topology 464 * and prepare rep_ack. 465 * @dev: device corresponding to the mei_cl_device 466 * @data: Intel HW specific hdcp data 467 * @rep_topology: Receiver ID List to be validated 468 * @rep_send_ack : repeater ack from ME FW. 469 * 470 * Return: 0 on Success, <0 on Failure 471 */ 472static int 473mei_hdcp_repeater_check_flow_prepare_ack(struct device *dev, 474 struct hdcp_port_data *data, 475 struct hdcp2_rep_send_receiverid_list 476 *rep_topology, 477 struct hdcp2_rep_send_ack 478 *rep_send_ack) 479{ 480 struct wired_cmd_verify_repeater_in verify_repeater_in = { { 0 } }; 481 struct wired_cmd_verify_repeater_out verify_repeater_out = { { 0 } }; 482 struct mei_cl_device *cldev; 483 ssize_t byte; 484 485 if (!dev || !rep_topology || !rep_send_ack || !data) 486 return -EINVAL; 487 488 cldev = to_mei_cl_device(dev); 489 490 verify_repeater_in.header.api_version = HDCP_API_VERSION; 491 verify_repeater_in.header.command_id = WIRED_VERIFY_REPEATER; 492 verify_repeater_in.header.status = ME_HDCP_STATUS_SUCCESS; 493 verify_repeater_in.header.buffer_len = 494 WIRED_CMD_BUF_LEN_VERIFY_REPEATER_IN; 495 496 verify_repeater_in.port.integrated_port_type = data->port_type; 497 verify_repeater_in.port.physical_port = (u8)data->fw_ddi; 498 verify_repeater_in.port.attached_transcoder = (u8)data->fw_tc; 499 500 memcpy(verify_repeater_in.rx_info, rep_topology->rx_info, 501 HDCP_2_2_RXINFO_LEN); 502 memcpy(verify_repeater_in.seq_num_v, rep_topology->seq_num_v, 503 HDCP_2_2_SEQ_NUM_LEN); 504 memcpy(verify_repeater_in.v_prime, rep_topology->v_prime, 505 HDCP_2_2_V_PRIME_HALF_LEN); 506 memcpy(verify_repeater_in.receiver_ids, rep_topology->receiver_ids, 507 HDCP_2_2_RECEIVER_IDS_MAX_LEN); 508 509 byte = mei_cldev_send(cldev, (u8 *)&verify_repeater_in, 510 sizeof(verify_repeater_in)); 511 if (byte < 0) { 512 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte); 513 return byte; 514 } 515 516 byte = mei_cldev_recv(cldev, (u8 *)&verify_repeater_out, 517 sizeof(verify_repeater_out)); 518 if (byte < 0) { 519 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte); 520 return byte; 521 } 522 523 if (verify_repeater_out.header.status != ME_HDCP_STATUS_SUCCESS) { 524 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n", 525 WIRED_VERIFY_REPEATER, 526 verify_repeater_out.header.status); 527 return -EIO; 528 } 529 530 memcpy(rep_send_ack->v, verify_repeater_out.v, 531 HDCP_2_2_V_PRIME_HALF_LEN); 532 rep_send_ack->msg_id = HDCP_2_2_REP_SEND_ACK; 533 534 return 0; 535} 536 537/** 538 * mei_hdcp_verify_mprime() - Verify mprime. 539 * @dev: device corresponding to the mei_cl_device 540 * @data: Intel HW specific hdcp data 541 * @stream_ready: RepeaterAuth_Stream_Ready msg for ME FW verification. 542 * 543 * Return: 0 on Success, <0 on Failure 544 */ 545static int mei_hdcp_verify_mprime(struct device *dev, 546 struct hdcp_port_data *data, 547 struct hdcp2_rep_stream_ready *stream_ready) 548{ 549 struct wired_cmd_repeater_auth_stream_req_in *verify_mprime_in; 550 struct wired_cmd_repeater_auth_stream_req_out 551 verify_mprime_out = { { 0 } }; 552 struct mei_cl_device *cldev; 553 ssize_t byte; 554 size_t cmd_size; 555 556 if (!dev || !stream_ready || !data) 557 return -EINVAL; 558 559 cldev = to_mei_cl_device(dev); 560 561 cmd_size = struct_size(verify_mprime_in, streams, data->k); 562 if (cmd_size == SIZE_MAX) 563 return -EINVAL; 564 565 verify_mprime_in = kzalloc(cmd_size, GFP_KERNEL); 566 if (!verify_mprime_in) 567 return -ENOMEM; 568 569 verify_mprime_in->header.api_version = HDCP_API_VERSION; 570 verify_mprime_in->header.command_id = WIRED_REPEATER_AUTH_STREAM_REQ; 571 verify_mprime_in->header.status = ME_HDCP_STATUS_SUCCESS; 572 verify_mprime_in->header.buffer_len = 573 WIRED_CMD_BUF_LEN_REPEATER_AUTH_STREAM_REQ_MIN_IN; 574 575 verify_mprime_in->port.integrated_port_type = data->port_type; 576 verify_mprime_in->port.physical_port = (u8)data->fw_ddi; 577 verify_mprime_in->port.attached_transcoder = (u8)data->fw_tc; 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 != ME_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 */ 619static 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 = ME_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->fw_ddi; 639 enable_auth_in.port.attached_transcoder = (u8)data->fw_tc; 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 != ME_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 */ 673static int 674mei_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 = ME_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->fw_ddi; 694 session_close_in.port.attached_transcoder = (u8)data->fw_tc; 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 != ME_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 719static const struct i915_hdcp_component_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 736static int mei_component_master_bind(struct device *dev) 737{ 738 struct mei_cl_device *cldev = to_mei_cl_device(dev); 739 struct i915_hdcp_comp_master *comp_master = 740 mei_cldev_get_drvdata(cldev); 741 int ret; 742 743 dev_dbg(dev, "%s\n", __func__); 744 comp_master->ops = &mei_hdcp_ops; 745 comp_master->mei_dev = dev; 746 ret = component_bind_all(dev, comp_master); 747 if (ret < 0) 748 return ret; 749 750 return 0; 751} 752 753static void mei_component_master_unbind(struct device *dev) 754{ 755 struct mei_cl_device *cldev = to_mei_cl_device(dev); 756 struct i915_hdcp_comp_master *comp_master = 757 mei_cldev_get_drvdata(cldev); 758 759 dev_dbg(dev, "%s\n", __func__); 760 component_unbind_all(dev, comp_master); 761} 762 763static const struct component_master_ops mei_component_master_ops = { 764 .bind = mei_component_master_bind, 765 .unbind = mei_component_master_unbind, 766}; 767 768/** 769 * mei_hdcp_component_match - compare function for matching mei hdcp. 770 * 771 * The function checks if the driver is i915, the subcomponent is HDCP 772 * and the grand parent of hdcp and the parent of i915 are the same 773 * PCH device. 774 * 775 * @dev: master device 776 * @subcomponent: subcomponent to match (I915_COMPONENT_HDCP) 777 * @data: compare data (mei hdcp device) 778 * 779 * Return: 780 * * 1 - if components match 781 * * 0 - otherwise 782 */ 783static int mei_hdcp_component_match(struct device *dev, int subcomponent, 784 void *data) 785{ 786 struct device *base = data; 787 788 if (strcmp(dev->driver->name, "i915") || 789 subcomponent != I915_COMPONENT_HDCP) 790 return 0; 791 792 base = base->parent; 793 if (!base) 794 return 0; 795 796 base = base->parent; 797 dev = dev->parent; 798 799 return (base && dev && dev == base); 800} 801 802static int mei_hdcp_probe(struct mei_cl_device *cldev, 803 const struct mei_cl_device_id *id) 804{ 805 struct i915_hdcp_comp_master *comp_master; 806 struct component_match *master_match; 807 int ret; 808 809 ret = mei_cldev_enable(cldev); 810 if (ret < 0) { 811 dev_err(&cldev->dev, "mei_cldev_enable Failed. %d\n", ret); 812 goto enable_err_exit; 813 } 814 815 comp_master = kzalloc(sizeof(*comp_master), GFP_KERNEL); 816 if (!comp_master) { 817 ret = -ENOMEM; 818 goto err_exit; 819 } 820 821 master_match = NULL; 822 component_match_add_typed(&cldev->dev, &master_match, 823 mei_hdcp_component_match, &cldev->dev); 824 if (IS_ERR_OR_NULL(master_match)) { 825 ret = -ENOMEM; 826 goto err_exit; 827 } 828 829 mei_cldev_set_drvdata(cldev, comp_master); 830 ret = component_master_add_with_match(&cldev->dev, 831 &mei_component_master_ops, 832 master_match); 833 if (ret < 0) { 834 dev_err(&cldev->dev, "Master comp add failed %d\n", ret); 835 goto err_exit; 836 } 837 838 return 0; 839 840err_exit: 841 mei_cldev_set_drvdata(cldev, NULL); 842 kfree(comp_master); 843 mei_cldev_disable(cldev); 844enable_err_exit: 845 return ret; 846} 847 848static int mei_hdcp_remove(struct mei_cl_device *cldev) 849{ 850 struct i915_hdcp_comp_master *comp_master = 851 mei_cldev_get_drvdata(cldev); 852 853 component_master_del(&cldev->dev, &mei_component_master_ops); 854 kfree(comp_master); 855 mei_cldev_set_drvdata(cldev, NULL); 856 857 return mei_cldev_disable(cldev); 858} 859 860#define MEI_UUID_HDCP GUID_INIT(0xB638AB7E, 0x94E2, 0x4EA2, 0xA5, \ 861 0x52, 0xD1, 0xC5, 0x4B, 0x62, 0x7F, 0x04) 862 863static const struct mei_cl_device_id mei_hdcp_tbl[] = { 864 { .uuid = MEI_UUID_HDCP, .version = MEI_CL_VERSION_ANY }, 865 { } 866}; 867MODULE_DEVICE_TABLE(mei, mei_hdcp_tbl); 868 869static struct mei_cl_driver mei_hdcp_driver = { 870 .id_table = mei_hdcp_tbl, 871 .name = KBUILD_MODNAME, 872 .probe = mei_hdcp_probe, 873 .remove = mei_hdcp_remove, 874}; 875 876module_mei_cl_driver(mei_hdcp_driver); 877 878MODULE_AUTHOR("Intel Corporation"); 879MODULE_LICENSE("GPL"); 880MODULE_DESCRIPTION("MEI HDCP"); 881