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 "amdgpu_dm_hdcp.h" 27 #include "amdgpu.h" 28 #include "amdgpu_dm.h" 29 #include "dm_helpers.h" 30 #include <drm/display/drm_hdcp_helper.h> 31 #include "hdcp_psp.h" 32 33 /* 34 * If the SRM version being loaded is less than or equal to the 35 * currently loaded SRM, psp will return 0xFFFF as the version 36 */ 37 #define PSP_SRM_VERSION_MAX 0xFFFF 38 39 static bool 40 lp_write_i2c(void *handle, uint32_t address, const uint8_t *data, uint32_t size) 41 { 42 43 struct dc_link *link = handle; 44 struct i2c_payload i2c_payloads[] = {{true, address, size, (void *)data} }; 45 struct i2c_command cmd = {i2c_payloads, 1, I2C_COMMAND_ENGINE_HW, link->dc->caps.i2c_speed_in_khz}; 46 47 return dm_helpers_submit_i2c(link->ctx, link, &cmd); 48 } 49 50 static bool 51 lp_read_i2c(void *handle, uint32_t address, uint8_t offset, uint8_t *data, uint32_t size) 52 { 53 struct dc_link *link = handle; 54 55 struct i2c_payload i2c_payloads[] = {{true, address, 1, &offset}, {false, address, size, data} }; 56 struct i2c_command cmd = {i2c_payloads, 2, I2C_COMMAND_ENGINE_HW, link->dc->caps.i2c_speed_in_khz}; 57 58 return dm_helpers_submit_i2c(link->ctx, link, &cmd); 59 } 60 61 static bool 62 lp_write_dpcd(void *handle, uint32_t address, const uint8_t *data, uint32_t size) 63 { 64 struct dc_link *link = handle; 65 66 return dm_helpers_dp_write_dpcd(link->ctx, link, address, data, size); 67 } 68 69 static bool 70 lp_read_dpcd(void *handle, uint32_t address, uint8_t *data, uint32_t size) 71 { 72 struct dc_link *link = handle; 73 74 return dm_helpers_dp_read_dpcd(link->ctx, link, address, data, size); 75 } 76 77 static uint8_t *psp_get_srm(struct psp_context *psp, uint32_t *srm_version, uint32_t *srm_size) 78 { 79 80 struct ta_hdcp_shared_memory *hdcp_cmd; 81 82 if (!psp->hdcp_context.context.initialized) { 83 DRM_WARN("Failed to get hdcp srm. HDCP TA is not initialized."); 84 return NULL; 85 } 86 87 hdcp_cmd = (struct ta_hdcp_shared_memory *)psp->hdcp_context.context.mem_context.shared_buf; 88 memset(hdcp_cmd, 0, sizeof(struct ta_hdcp_shared_memory)); 89 90 hdcp_cmd->cmd_id = TA_HDCP_COMMAND__HDCP_GET_SRM; 91 psp_hdcp_invoke(psp, hdcp_cmd->cmd_id); 92 93 if (hdcp_cmd->hdcp_status != TA_HDCP_STATUS__SUCCESS) 94 return NULL; 95 96 *srm_version = hdcp_cmd->out_msg.hdcp_get_srm.srm_version; 97 *srm_size = hdcp_cmd->out_msg.hdcp_get_srm.srm_buf_size; 98 99 100 return hdcp_cmd->out_msg.hdcp_get_srm.srm_buf; 101 } 102 103 static int psp_set_srm(struct psp_context *psp, uint8_t *srm, uint32_t srm_size, uint32_t *srm_version) 104 { 105 106 struct ta_hdcp_shared_memory *hdcp_cmd; 107 108 if (!psp->hdcp_context.context.initialized) { 109 DRM_WARN("Failed to get hdcp srm. HDCP TA is not initialized."); 110 return -EINVAL; 111 } 112 113 hdcp_cmd = (struct ta_hdcp_shared_memory *)psp->hdcp_context.context.mem_context.shared_buf; 114 memset(hdcp_cmd, 0, sizeof(struct ta_hdcp_shared_memory)); 115 116 memcpy(hdcp_cmd->in_msg.hdcp_set_srm.srm_buf, srm, srm_size); 117 hdcp_cmd->in_msg.hdcp_set_srm.srm_buf_size = srm_size; 118 hdcp_cmd->cmd_id = TA_HDCP_COMMAND__HDCP_SET_SRM; 119 120 psp_hdcp_invoke(psp, hdcp_cmd->cmd_id); 121 122 if (hdcp_cmd->hdcp_status != TA_HDCP_STATUS__SUCCESS || hdcp_cmd->out_msg.hdcp_set_srm.valid_signature != 1 || 123 hdcp_cmd->out_msg.hdcp_set_srm.srm_version == PSP_SRM_VERSION_MAX) 124 return -EINVAL; 125 126 *srm_version = hdcp_cmd->out_msg.hdcp_set_srm.srm_version; 127 return 0; 128 } 129 130 static void process_output(struct hdcp_workqueue *hdcp_work) 131 { 132 struct mod_hdcp_output output = hdcp_work->output; 133 134 if (output.callback_stop) 135 cancel_delayed_work(&hdcp_work->callback_dwork); 136 137 if (output.callback_needed) 138 schedule_delayed_work(&hdcp_work->callback_dwork, 139 msecs_to_jiffies(output.callback_delay)); 140 141 if (output.watchdog_timer_stop) 142 cancel_delayed_work(&hdcp_work->watchdog_timer_dwork); 143 144 if (output.watchdog_timer_needed) 145 schedule_delayed_work(&hdcp_work->watchdog_timer_dwork, 146 msecs_to_jiffies(output.watchdog_timer_delay)); 147 148 schedule_delayed_work(&hdcp_work->property_validate_dwork, msecs_to_jiffies(0)); 149 } 150 151 static void link_lock(struct hdcp_workqueue *work, bool lock) 152 { 153 154 int i = 0; 155 156 for (i = 0; i < work->max_link; i++) { 157 if (lock) 158 mutex_lock(&work[i].mutex); 159 else 160 mutex_unlock(&work[i].mutex); 161 } 162 } 163 void hdcp_update_display(struct hdcp_workqueue *hdcp_work, 164 unsigned int link_index, 165 struct amdgpu_dm_connector *aconnector, 166 uint8_t content_type, 167 bool enable_encryption) 168 { 169 struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index]; 170 struct mod_hdcp_display *display = &hdcp_work[link_index].display; 171 struct mod_hdcp_link *link = &hdcp_work[link_index].link; 172 struct mod_hdcp_display_query query; 173 174 mutex_lock(&hdcp_w->mutex); 175 hdcp_w->aconnector = aconnector; 176 177 query.display = NULL; 178 mod_hdcp_query_display(&hdcp_w->hdcp, aconnector->base.index, &query); 179 180 if (query.display != NULL) { 181 memcpy(display, query.display, sizeof(struct mod_hdcp_display)); 182 mod_hdcp_remove_display(&hdcp_w->hdcp, aconnector->base.index, &hdcp_w->output); 183 184 hdcp_w->link.adjust.hdcp2.force_type = MOD_HDCP_FORCE_TYPE_0; 185 186 if (enable_encryption) { 187 /* Explicitly set the saved SRM as sysfs call will be after we already enabled hdcp 188 * (s3 resume case) 189 */ 190 if (hdcp_work->srm_size > 0) 191 psp_set_srm(hdcp_work->hdcp.config.psp.handle, hdcp_work->srm, hdcp_work->srm_size, 192 &hdcp_work->srm_version); 193 194 display->adjust.disable = MOD_HDCP_DISPLAY_NOT_DISABLE; 195 if (content_type == DRM_MODE_HDCP_CONTENT_TYPE0) { 196 hdcp_w->link.adjust.hdcp1.disable = 0; 197 hdcp_w->link.adjust.hdcp2.force_type = MOD_HDCP_FORCE_TYPE_0; 198 } else if (content_type == DRM_MODE_HDCP_CONTENT_TYPE1) { 199 hdcp_w->link.adjust.hdcp1.disable = 1; 200 hdcp_w->link.adjust.hdcp2.force_type = MOD_HDCP_FORCE_TYPE_1; 201 } 202 203 schedule_delayed_work(&hdcp_w->property_validate_dwork, 204 msecs_to_jiffies(DRM_HDCP_CHECK_PERIOD_MS)); 205 } else { 206 display->adjust.disable = MOD_HDCP_DISPLAY_DISABLE_AUTHENTICATION; 207 hdcp_w->encryption_status = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF; 208 cancel_delayed_work(&hdcp_w->property_validate_dwork); 209 } 210 211 display->state = MOD_HDCP_DISPLAY_ACTIVE; 212 } 213 214 mod_hdcp_add_display(&hdcp_w->hdcp, link, display, &hdcp_w->output); 215 216 process_output(hdcp_w); 217 mutex_unlock(&hdcp_w->mutex); 218 } 219 220 static void hdcp_remove_display(struct hdcp_workqueue *hdcp_work, 221 unsigned int link_index, 222 struct amdgpu_dm_connector *aconnector) 223 { 224 struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index]; 225 struct drm_connector_state *conn_state = aconnector->base.state; 226 227 mutex_lock(&hdcp_w->mutex); 228 hdcp_w->aconnector = aconnector; 229 230 /* the removal of display will invoke auth reset -> hdcp destroy and 231 * we'd expect the Content Protection (CP) property changed back to 232 * DESIRED if at the time ENABLED. CP property change should occur 233 * before the element removed from linked list. 234 */ 235 if (conn_state && conn_state->content_protection == DRM_MODE_CONTENT_PROTECTION_ENABLED) { 236 conn_state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED; 237 238 DRM_DEBUG_DRIVER("[HDCP_DM] display %d, CP 2 -> 1, type %u, DPMS %u\n", 239 aconnector->base.index, conn_state->hdcp_content_type, aconnector->base.dpms); 240 } 241 242 mod_hdcp_remove_display(&hdcp_w->hdcp, aconnector->base.index, &hdcp_w->output); 243 244 process_output(hdcp_w); 245 mutex_unlock(&hdcp_w->mutex); 246 } 247 void hdcp_reset_display(struct hdcp_workqueue *hdcp_work, unsigned int link_index) 248 { 249 struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index]; 250 251 mutex_lock(&hdcp_w->mutex); 252 253 mod_hdcp_reset_connection(&hdcp_w->hdcp, &hdcp_w->output); 254 255 cancel_delayed_work(&hdcp_w->property_validate_dwork); 256 hdcp_w->encryption_status = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF; 257 258 process_output(hdcp_w); 259 260 mutex_unlock(&hdcp_w->mutex); 261 } 262 263 void hdcp_handle_cpirq(struct hdcp_workqueue *hdcp_work, unsigned int link_index) 264 { 265 struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index]; 266 267 schedule_work(&hdcp_w->cpirq_work); 268 } 269 270 271 272 273 static void event_callback(struct work_struct *work) 274 { 275 struct hdcp_workqueue *hdcp_work; 276 277 hdcp_work = container_of(to_delayed_work(work), struct hdcp_workqueue, 278 callback_dwork); 279 280 mutex_lock(&hdcp_work->mutex); 281 282 cancel_delayed_work(&hdcp_work->callback_dwork); 283 284 mod_hdcp_process_event(&hdcp_work->hdcp, MOD_HDCP_EVENT_CALLBACK, 285 &hdcp_work->output); 286 287 process_output(hdcp_work); 288 289 mutex_unlock(&hdcp_work->mutex); 290 291 292 } 293 static void event_property_update(struct work_struct *work) 294 { 295 296 struct hdcp_workqueue *hdcp_work = container_of(work, struct hdcp_workqueue, property_update_work); 297 struct amdgpu_dm_connector *aconnector = hdcp_work->aconnector; 298 struct drm_device *dev = hdcp_work->aconnector->base.dev; 299 long ret; 300 301 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); 302 mutex_lock(&hdcp_work->mutex); 303 304 305 if (aconnector->base.state && aconnector->base.state->commit) { 306 ret = wait_for_completion_interruptible_timeout(&aconnector->base.state->commit->hw_done, 10 * HZ); 307 308 if (ret == 0) { 309 DRM_ERROR("HDCP state unknown! Setting it to DESIRED"); 310 hdcp_work->encryption_status = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF; 311 } 312 } 313 314 if (aconnector->base.state) { 315 if (hdcp_work->encryption_status != MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF) { 316 if (aconnector->base.state->hdcp_content_type == 317 DRM_MODE_HDCP_CONTENT_TYPE0 && 318 hdcp_work->encryption_status <= 319 MOD_HDCP_ENCRYPTION_STATUS_HDCP2_TYPE0_ON) 320 drm_hdcp_update_content_protection(&aconnector->base, 321 DRM_MODE_CONTENT_PROTECTION_ENABLED); 322 else if (aconnector->base.state->hdcp_content_type == 323 DRM_MODE_HDCP_CONTENT_TYPE1 && 324 hdcp_work->encryption_status == 325 MOD_HDCP_ENCRYPTION_STATUS_HDCP2_TYPE1_ON) 326 drm_hdcp_update_content_protection(&aconnector->base, 327 DRM_MODE_CONTENT_PROTECTION_ENABLED); 328 } else { 329 drm_hdcp_update_content_protection(&aconnector->base, 330 DRM_MODE_CONTENT_PROTECTION_DESIRED); 331 } 332 } 333 334 mutex_unlock(&hdcp_work->mutex); 335 drm_modeset_unlock(&dev->mode_config.connection_mutex); 336 } 337 338 static void event_property_validate(struct work_struct *work) 339 { 340 struct hdcp_workqueue *hdcp_work = 341 container_of(to_delayed_work(work), struct hdcp_workqueue, property_validate_dwork); 342 struct mod_hdcp_display_query query; 343 struct amdgpu_dm_connector *aconnector = hdcp_work->aconnector; 344 345 if (!aconnector) 346 return; 347 348 mutex_lock(&hdcp_work->mutex); 349 350 query.encryption_status = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF; 351 mod_hdcp_query_display(&hdcp_work->hdcp, aconnector->base.index, &query); 352 353 if (query.encryption_status != hdcp_work->encryption_status) { 354 hdcp_work->encryption_status = query.encryption_status; 355 schedule_work(&hdcp_work->property_update_work); 356 } 357 358 mutex_unlock(&hdcp_work->mutex); 359 } 360 361 static void event_watchdog_timer(struct work_struct *work) 362 { 363 struct hdcp_workqueue *hdcp_work; 364 365 hdcp_work = container_of(to_delayed_work(work), 366 struct hdcp_workqueue, 367 watchdog_timer_dwork); 368 369 mutex_lock(&hdcp_work->mutex); 370 371 cancel_delayed_work(&hdcp_work->watchdog_timer_dwork); 372 373 mod_hdcp_process_event(&hdcp_work->hdcp, 374 MOD_HDCP_EVENT_WATCHDOG_TIMEOUT, 375 &hdcp_work->output); 376 377 process_output(hdcp_work); 378 379 mutex_unlock(&hdcp_work->mutex); 380 381 } 382 383 static void event_cpirq(struct work_struct *work) 384 { 385 struct hdcp_workqueue *hdcp_work; 386 387 hdcp_work = container_of(work, struct hdcp_workqueue, cpirq_work); 388 389 mutex_lock(&hdcp_work->mutex); 390 391 mod_hdcp_process_event(&hdcp_work->hdcp, MOD_HDCP_EVENT_CPIRQ, &hdcp_work->output); 392 393 process_output(hdcp_work); 394 395 mutex_unlock(&hdcp_work->mutex); 396 397 } 398 399 400 void hdcp_destroy(struct kobject *kobj, struct hdcp_workqueue *hdcp_work) 401 { 402 int i = 0; 403 404 for (i = 0; i < hdcp_work->max_link; i++) { 405 cancel_delayed_work_sync(&hdcp_work[i].callback_dwork); 406 cancel_delayed_work_sync(&hdcp_work[i].watchdog_timer_dwork); 407 } 408 409 sysfs_remove_bin_file(kobj, &hdcp_work[0].attr); 410 kfree(hdcp_work->srm); 411 kfree(hdcp_work->srm_temp); 412 kfree(hdcp_work); 413 } 414 415 416 static bool enable_assr(void *handle, struct dc_link *link) 417 { 418 419 struct hdcp_workqueue *hdcp_work = handle; 420 struct mod_hdcp hdcp = hdcp_work->hdcp; 421 struct psp_context *psp = hdcp.config.psp.handle; 422 struct ta_dtm_shared_memory *dtm_cmd; 423 bool res = true; 424 425 if (!psp->dtm_context.context.initialized) { 426 DRM_INFO("Failed to enable ASSR, DTM TA is not initialized."); 427 return false; 428 } 429 430 dtm_cmd = (struct ta_dtm_shared_memory *)psp->dtm_context.context.mem_context.shared_buf; 431 432 mutex_lock(&psp->dtm_context.mutex); 433 memset(dtm_cmd, 0, sizeof(struct ta_dtm_shared_memory)); 434 435 dtm_cmd->cmd_id = TA_DTM_COMMAND__TOPOLOGY_ASSR_ENABLE; 436 dtm_cmd->dtm_in_message.topology_assr_enable.display_topology_dig_be_index = link->link_enc_hw_inst; 437 dtm_cmd->dtm_status = TA_DTM_STATUS__GENERIC_FAILURE; 438 439 psp_dtm_invoke(psp, dtm_cmd->cmd_id); 440 441 if (dtm_cmd->dtm_status != TA_DTM_STATUS__SUCCESS) { 442 DRM_INFO("Failed to enable ASSR"); 443 res = false; 444 } 445 446 mutex_unlock(&psp->dtm_context.mutex); 447 448 return res; 449 } 450 451 static void update_config(void *handle, struct cp_psp_stream_config *config) 452 { 453 struct hdcp_workqueue *hdcp_work = handle; 454 struct amdgpu_dm_connector *aconnector = config->dm_stream_ctx; 455 int link_index = aconnector->dc_link->link_index; 456 struct mod_hdcp_display *display = &hdcp_work[link_index].display; 457 struct mod_hdcp_link *link = &hdcp_work[link_index].link; 458 struct drm_connector_state *conn_state; 459 struct dc_sink *sink = NULL; 460 bool link_is_hdcp14 = false; 461 462 if (config->dpms_off) { 463 hdcp_remove_display(hdcp_work, link_index, aconnector); 464 return; 465 } 466 467 memset(display, 0, sizeof(*display)); 468 memset(link, 0, sizeof(*link)); 469 470 display->index = aconnector->base.index; 471 display->state = MOD_HDCP_DISPLAY_ACTIVE; 472 473 if (aconnector->dc_sink) 474 sink = aconnector->dc_sink; 475 else if (aconnector->dc_em_sink) 476 sink = aconnector->dc_em_sink; 477 478 if (sink != NULL) 479 link->mode = mod_hdcp_signal_type_to_operation_mode(sink->sink_signal); 480 481 display->controller = CONTROLLER_ID_D0 + config->otg_inst; 482 display->dig_fe = config->dig_fe; 483 link->dig_be = config->dig_be; 484 link->ddc_line = aconnector->dc_link->ddc_hw_inst + 1; 485 display->stream_enc_idx = config->stream_enc_idx; 486 link->link_enc_idx = config->link_enc_idx; 487 link->dio_output_id = config->dio_output_idx; 488 link->phy_idx = config->phy_idx; 489 490 if (sink) 491 link_is_hdcp14 = dc_link_is_hdcp14(aconnector->dc_link, sink->sink_signal); 492 link->hdcp_supported_informational = link_is_hdcp14; 493 link->dp.rev = aconnector->dc_link->dpcd_caps.dpcd_rev.raw; 494 link->dp.assr_enabled = config->assr_enabled; 495 link->dp.mst_enabled = config->mst_enabled; 496 link->dp.usb4_enabled = config->usb4_enabled; 497 display->adjust.disable = MOD_HDCP_DISPLAY_DISABLE_AUTHENTICATION; 498 link->adjust.auth_delay = 3; 499 link->adjust.hdcp1.disable = 0; 500 conn_state = aconnector->base.state; 501 502 DRM_DEBUG_DRIVER("[HDCP_DM] display %d, CP %d, type %d\n", aconnector->base.index, 503 (!!aconnector->base.state) ? aconnector->base.state->content_protection : -1, 504 (!!aconnector->base.state) ? aconnector->base.state->hdcp_content_type : -1); 505 506 if (conn_state) 507 hdcp_update_display(hdcp_work, link_index, aconnector, 508 conn_state->hdcp_content_type, false); 509 } 510 511 512 /* NOTE: From the usermodes prospective you only need to call write *ONCE*, the kernel 513 * will automatically call once or twice depending on the size 514 * 515 * call: "cat file > /sys/class/drm/card0/device/hdcp_srm" from usermode no matter what the size is 516 * 517 * The kernel can only send PAGE_SIZE at once and since MAX_SRM_FILE(5120) > PAGE_SIZE(4096), 518 * srm_data_write can be called multiple times. 519 * 520 * sysfs interface doesn't tell us the size we will get so we are sending partial SRMs to psp and on 521 * the last call we will send the full SRM. PSP will fail on every call before the last. 522 * 523 * This means we don't know if the SRM is good until the last call. And because of this limitation we 524 * cannot throw errors early as it will stop the kernel from writing to sysfs 525 * 526 * Example 1: 527 * Good SRM size = 5096 528 * first call to write 4096 -> PSP fails 529 * Second call to write 1000 -> PSP Pass -> SRM is set 530 * 531 * Example 2: 532 * Bad SRM size = 4096 533 * first call to write 4096 -> PSP fails (This is the same as above, but we don't know if this 534 * is the last call) 535 * 536 * Solution?: 537 * 1: Parse the SRM? -> It is signed so we don't know the EOF 538 * 2: We can have another sysfs that passes the size before calling set. -> simpler solution 539 * below 540 * 541 * Easy Solution: 542 * Always call get after Set to verify if set was successful. 543 * +----------------------+ 544 * | Why it works: | 545 * +----------------------+ 546 * PSP will only update its srm if its older than the one we are trying to load. 547 * Always do set first than get. 548 * -if we try to "1. SET" a older version PSP will reject it and we can "2. GET" the newer 549 * version and save it 550 * 551 * -if we try to "1. SET" a newer version PSP will accept it and we can "2. GET" the 552 * same(newer) version back and save it 553 * 554 * -if we try to "1. SET" a newer version and PSP rejects it. That means the format is 555 * incorrect/corrupted and we should correct our SRM by getting it from PSP 556 */ 557 static ssize_t srm_data_write(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buffer, 558 loff_t pos, size_t count) 559 { 560 struct hdcp_workqueue *work; 561 uint32_t srm_version = 0; 562 563 work = container_of(bin_attr, struct hdcp_workqueue, attr); 564 link_lock(work, true); 565 566 memcpy(work->srm_temp + pos, buffer, count); 567 568 if (!psp_set_srm(work->hdcp.config.psp.handle, work->srm_temp, pos + count, &srm_version)) { 569 DRM_DEBUG_DRIVER("HDCP SRM SET version 0x%X", srm_version); 570 memcpy(work->srm, work->srm_temp, pos + count); 571 work->srm_size = pos + count; 572 work->srm_version = srm_version; 573 } 574 575 576 link_lock(work, false); 577 578 return count; 579 } 580 581 static ssize_t srm_data_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buffer, 582 loff_t pos, size_t count) 583 { 584 struct hdcp_workqueue *work; 585 uint8_t *srm = NULL; 586 uint32_t srm_version; 587 uint32_t srm_size; 588 size_t ret = count; 589 590 work = container_of(bin_attr, struct hdcp_workqueue, attr); 591 592 link_lock(work, true); 593 594 srm = psp_get_srm(work->hdcp.config.psp.handle, &srm_version, &srm_size); 595 596 if (!srm) { 597 ret = -EINVAL; 598 goto ret; 599 } 600 601 if (pos >= srm_size) 602 ret = 0; 603 604 if (srm_size - pos < count) { 605 memcpy(buffer, srm + pos, srm_size - pos); 606 ret = srm_size - pos; 607 goto ret; 608 } 609 610 memcpy(buffer, srm + pos, count); 611 612 ret: 613 link_lock(work, false); 614 return ret; 615 } 616 617 /* From the hdcp spec (5.Renewability) SRM needs to be stored in a non-volatile memory. 618 * 619 * For example, 620 * if Application "A" sets the SRM (ver 2) and we reboot/suspend and later when Application "B" 621 * needs to use HDCP, the version in PSP should be SRM(ver 2). So SRM should be persistent 622 * across boot/reboots/suspend/resume/shutdown 623 * 624 * Currently when the system goes down (suspend/shutdown) the SRM is cleared from PSP. For HDCP we need 625 * to make the SRM persistent. 626 * 627 * -PSP owns the checking of SRM but doesn't have the ability to store it in a non-volatile memory. 628 * -The kernel cannot write to the file systems. 629 * -So we need usermode to do this for us, which is why an interface for usermode is needed 630 * 631 * 632 * 633 * Usermode can read/write to/from PSP using the sysfs interface 634 * For example: 635 * to save SRM from PSP to storage : cat /sys/class/drm/card0/device/hdcp_srm > srmfile 636 * to load from storage to PSP: cat srmfile > /sys/class/drm/card0/device/hdcp_srm 637 */ 638 static const struct bin_attribute data_attr = { 639 .attr = {.name = "hdcp_srm", .mode = 0664}, 640 .size = PSP_HDCP_SRM_FIRST_GEN_MAX_SIZE, /* Limit SRM size */ 641 .write = srm_data_write, 642 .read = srm_data_read, 643 }; 644 645 646 struct hdcp_workqueue *hdcp_create_workqueue(struct amdgpu_device *adev, struct cp_psp *cp_psp, struct dc *dc) 647 { 648 649 int max_caps = dc->caps.max_links; 650 struct hdcp_workqueue *hdcp_work; 651 int i = 0; 652 653 hdcp_work = kcalloc(max_caps, sizeof(*hdcp_work), GFP_KERNEL); 654 if (ZERO_OR_NULL_PTR(hdcp_work)) 655 return NULL; 656 657 hdcp_work->srm = kcalloc(PSP_HDCP_SRM_FIRST_GEN_MAX_SIZE, sizeof(*hdcp_work->srm), GFP_KERNEL); 658 659 if (hdcp_work->srm == NULL) 660 goto fail_alloc_context; 661 662 hdcp_work->srm_temp = kcalloc(PSP_HDCP_SRM_FIRST_GEN_MAX_SIZE, sizeof(*hdcp_work->srm_temp), GFP_KERNEL); 663 664 if (hdcp_work->srm_temp == NULL) 665 goto fail_alloc_context; 666 667 hdcp_work->max_link = max_caps; 668 669 for (i = 0; i < max_caps; i++) { 670 mutex_init(&hdcp_work[i].mutex); 671 672 INIT_WORK(&hdcp_work[i].cpirq_work, event_cpirq); 673 INIT_WORK(&hdcp_work[i].property_update_work, event_property_update); 674 INIT_DELAYED_WORK(&hdcp_work[i].callback_dwork, event_callback); 675 INIT_DELAYED_WORK(&hdcp_work[i].watchdog_timer_dwork, event_watchdog_timer); 676 INIT_DELAYED_WORK(&hdcp_work[i].property_validate_dwork, event_property_validate); 677 678 hdcp_work[i].hdcp.config.psp.handle = &adev->psp; 679 if (dc->ctx->dce_version == DCN_VERSION_3_1 || 680 dc->ctx->dce_version == DCN_VERSION_3_14 || 681 dc->ctx->dce_version == DCN_VERSION_3_15 || 682 dc->ctx->dce_version == DCN_VERSION_3_16) 683 hdcp_work[i].hdcp.config.psp.caps.dtm_v3_supported = 1; 684 hdcp_work[i].hdcp.config.ddc.handle = dc_get_link_at_index(dc, i); 685 hdcp_work[i].hdcp.config.ddc.funcs.write_i2c = lp_write_i2c; 686 hdcp_work[i].hdcp.config.ddc.funcs.read_i2c = lp_read_i2c; 687 hdcp_work[i].hdcp.config.ddc.funcs.write_dpcd = lp_write_dpcd; 688 hdcp_work[i].hdcp.config.ddc.funcs.read_dpcd = lp_read_dpcd; 689 } 690 691 cp_psp->funcs.update_stream_config = update_config; 692 cp_psp->funcs.enable_assr = enable_assr; 693 cp_psp->handle = hdcp_work; 694 695 /* File created at /sys/class/drm/card0/device/hdcp_srm*/ 696 hdcp_work[0].attr = data_attr; 697 sysfs_bin_attr_init(&hdcp_work[0].attr); 698 699 if (sysfs_create_bin_file(&adev->dev->kobj, &hdcp_work[0].attr)) 700 DRM_WARN("Failed to create device file hdcp_srm"); 701 702 return hdcp_work; 703 704 fail_alloc_context: 705 kfree(hdcp_work->srm); 706 kfree(hdcp_work->srm_temp); 707 kfree(hdcp_work); 708 709 return NULL; 710 711 712 713 } 714 715 716 717