drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c

   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         unsigned int conn_index = aconnector->base.index;
 174
 175         mutex_lock(&hdcp_w->mutex);
 176         hdcp_w->aconnector[conn_index] = aconnector;
 177
 178         query.display = NULL;
 179         mod_hdcp_query_display(&hdcp_w->hdcp, aconnector->base.index, &query);
 180
 181         if (query.display != NULL) {
 182                 memcpy(display, query.display, sizeof(struct mod_hdcp_display));
 183                 mod_hdcp_remove_display(&hdcp_w->hdcp, aconnector->base.index, &hdcp_w->output);
 184
 185                 hdcp_w->link.adjust.hdcp2.force_type = MOD_HDCP_FORCE_TYPE_0;
 186
 187                 if (enable_encryption) {
 188                         /* Explicitly set the saved SRM as sysfs call will be after we already enabled hdcp
 189                          * (s3 resume case)
 190                          */
 191                         if (hdcp_work->srm_size > 0)
 192                                 psp_set_srm(hdcp_work->hdcp.config.psp.handle, hdcp_work->srm, hdcp_work->srm_size,
 193                                             &hdcp_work->srm_version);
 194
 195                         display->adjust.disable = MOD_HDCP_DISPLAY_NOT_DISABLE;
 196                         if (content_type == DRM_MODE_HDCP_CONTENT_TYPE0) {
 197                                 hdcp_w->link.adjust.hdcp1.disable = 0;
 198                                 hdcp_w->link.adjust.hdcp2.force_type = MOD_HDCP_FORCE_TYPE_0;
 199                         } else if (content_type == DRM_MODE_HDCP_CONTENT_TYPE1) {
 200                                 hdcp_w->link.adjust.hdcp1.disable = 1;
 201                                 hdcp_w->link.adjust.hdcp2.force_type = MOD_HDCP_FORCE_TYPE_1;
 202                         }
 203
 204                         schedule_delayed_work(&hdcp_w->property_validate_dwork,
 205                                               msecs_to_jiffies(DRM_HDCP_CHECK_PERIOD_MS));
 206                 } else {
 207                         display->adjust.disable = MOD_HDCP_DISPLAY_DISABLE_AUTHENTICATION;
 208                         hdcp_w->encryption_status[conn_index] = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF;
 209                         cancel_delayed_work(&hdcp_w->property_validate_dwork);
 210                 }
 211
 212                 display->state = MOD_HDCP_DISPLAY_ACTIVE;
 213         }
 214
 215         mod_hdcp_add_display(&hdcp_w->hdcp, link, display, &hdcp_w->output);
 216
 217         process_output(hdcp_w);
 218         mutex_unlock(&hdcp_w->mutex);
 219 }
 220
 221 static void hdcp_remove_display(struct hdcp_workqueue *hdcp_work,
 222                          unsigned int link_index,
 223                          struct amdgpu_dm_connector *aconnector)
 224 {
 225         struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index];
 226         struct drm_connector_state *conn_state = aconnector->base.state;
 227         unsigned int conn_index = aconnector->base.index;
 228
 229         mutex_lock(&hdcp_w->mutex);
 230         hdcp_w->aconnector[conn_index] = aconnector;
 231
 232         /* the removal of display will invoke auth reset -> hdcp destroy and
 233          * we'd expect the Content Protection (CP) property changed back to
 234          * DESIRED if at the time ENABLED. CP property change should occur
 235          * before the element removed from linked list.
 236          */
 237         if (conn_state && conn_state->content_protection == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
 238                 conn_state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED;
 239
 240                 DRM_DEBUG_DRIVER("[HDCP_DM] display %d, CP 2 -> 1, type %u, DPMS %u\n",
 241                          aconnector->base.index, conn_state->hdcp_content_type, aconnector->base.dpms);
 242         }
 243
 244         mod_hdcp_remove_display(&hdcp_w->hdcp, aconnector->base.index, &hdcp_w->output);
 245
 246         process_output(hdcp_w);
 247         mutex_unlock(&hdcp_w->mutex);
 248 }
 249 void hdcp_reset_display(struct hdcp_workqueue *hdcp_work, unsigned int link_index)
 250 {
 251         struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index];
 252         unsigned int conn_index;
 253
 254         mutex_lock(&hdcp_w->mutex);
 255
 256         mod_hdcp_reset_connection(&hdcp_w->hdcp,  &hdcp_w->output);
 257
 258         cancel_delayed_work(&hdcp_w->property_validate_dwork);
 259
 260         for (conn_index = 0; conn_index < AMDGPU_DM_MAX_DISPLAY_INDEX; conn_index++) {
 261                 hdcp_w->encryption_status[conn_index] =
 262                         MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF;
 263         }
 264
 265         process_output(hdcp_w);
 266
 267         mutex_unlock(&hdcp_w->mutex);
 268 }
 269
 270 void hdcp_handle_cpirq(struct hdcp_workqueue *hdcp_work, unsigned int link_index)
 271 {
 272         struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index];
 273
 274         schedule_work(&hdcp_w->cpirq_work);
 275 }
 276
 277
 278
 279
 280 static void event_callback(struct work_struct *work)
 281 {
 282         struct hdcp_workqueue *hdcp_work;
 283
 284         hdcp_work = container_of(to_delayed_work(work), struct hdcp_workqueue,
 285                                       callback_dwork);
 286
 287         mutex_lock(&hdcp_work->mutex);
 288
 289         cancel_delayed_work(&hdcp_work->callback_dwork);
 290
 291         mod_hdcp_process_event(&hdcp_work->hdcp, MOD_HDCP_EVENT_CALLBACK,
 292                                &hdcp_work->output);
 293
 294         process_output(hdcp_work);
 295
 296         mutex_unlock(&hdcp_work->mutex);
 297
 298
 299 }
 300
 301 static void event_property_update(struct work_struct *work)
 302 {
 303         struct hdcp_workqueue *hdcp_work = container_of(work, struct hdcp_workqueue, property_update_work);
 304         struct amdgpu_dm_connector *aconnector = NULL;
 305         struct drm_device *dev;
 306         long ret;
 307         unsigned int conn_index;
 308         struct drm_connector *connector;
 309         struct drm_connector_state *conn_state;
 310
 311         for (conn_index = 0; conn_index < AMDGPU_DM_MAX_DISPLAY_INDEX; conn_index++) {
 312                 aconnector = hdcp_work->aconnector[conn_index];
 313
 314                 if (!aconnector)
 315                         continue;
 316
 317                 connector = &aconnector->base;
 318
 319                 /* check if display connected */
 320                 if (connector->status != connector_status_connected)
 321                         continue;
 322
 323                 conn_state = aconnector->base.state;
 324
 325                 if (!conn_state)
 326                         continue;
 327
 328                 dev = connector->dev;
 329
 330                 if (!dev)
 331                         continue;
 332
 333                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 334                 mutex_lock(&hdcp_work->mutex);
 335
 336                 if (conn_state->commit) {
 337                         ret = wait_for_completion_interruptible_timeout(
 338                                 &conn_state->commit->hw_done, 10 * HZ);
 339                         if (ret == 0) {
 340                                 DRM_ERROR(
 341                                         "HDCP state unknown! Setting it to DESIRED");
 342                                 hdcp_work->encryption_status[conn_index] =
 343                                         MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF;
 344                         }
 345                 }
 346                 if (hdcp_work->encryption_status[conn_index] !=
 347                         MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF) {
 348                         if (conn_state->hdcp_content_type ==
 349                                 DRM_MODE_HDCP_CONTENT_TYPE0 &&
 350                                 hdcp_work->encryption_status[conn_index] <=
 351                                 MOD_HDCP_ENCRYPTION_STATUS_HDCP2_TYPE0_ON) {
 352
 353                                 DRM_DEBUG_DRIVER("[HDCP_DM] DRM_MODE_CONTENT_PROTECTION_ENABLED\n");
 354                                 drm_hdcp_update_content_protection(
 355                                         connector,
 356                                         DRM_MODE_CONTENT_PROTECTION_ENABLED);
 357                         } else if (conn_state->hdcp_content_type ==
 358                                         DRM_MODE_HDCP_CONTENT_TYPE1 &&
 359                                         hdcp_work->encryption_status[conn_index] ==
 360                                         MOD_HDCP_ENCRYPTION_STATUS_HDCP2_TYPE1_ON) {
 361                                 drm_hdcp_update_content_protection(
 362                                         connector,
 363                                         DRM_MODE_CONTENT_PROTECTION_ENABLED);
 364                         }
 365                 } else {
 366                         DRM_DEBUG_DRIVER("[HDCP_DM] DRM_MODE_CONTENT_PROTECTION_DESIRED\n");
 367                         drm_hdcp_update_content_protection(
 368                                 connector, DRM_MODE_CONTENT_PROTECTION_DESIRED);
 369
 370                 }
 371                 mutex_unlock(&hdcp_work->mutex);
 372                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
 373         }
 374 }
 375
 376 static void event_property_validate(struct work_struct *work)
 377 {
 378         struct hdcp_workqueue *hdcp_work =
 379                 container_of(to_delayed_work(work), struct hdcp_workqueue, property_validate_dwork);
 380         struct mod_hdcp_display_query query;
 381         struct amdgpu_dm_connector *aconnector;
 382         unsigned int conn_index;
 383
 384         mutex_lock(&hdcp_work->mutex);
 385
 386         for (conn_index = 0; conn_index < AMDGPU_DM_MAX_DISPLAY_INDEX;
 387              conn_index++) {
 388                 aconnector = hdcp_work->aconnector[conn_index];
 389
 390                 if (!aconnector)
 391                         continue;
 392
 393                 /* check if display connected */
 394                 if (aconnector->base.status != connector_status_connected)
 395                         continue;
 396
 397                 if (!aconnector->base.state)
 398                         continue;
 399
 400                 query.encryption_status = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF;
 401                 mod_hdcp_query_display(&hdcp_work->hdcp, aconnector->base.index,
 402                                        &query);
 403
 404                 DRM_DEBUG_DRIVER("[HDCP_DM] disp %d, connector->CP %u, (query, work): (%d, %d)\n",
 405                         aconnector->base.index,
 406                         aconnector->base.state->content_protection,
 407                         query.encryption_status,
 408                         hdcp_work->encryption_status[conn_index]);
 409
 410                 if (query.encryption_status !=
 411                     hdcp_work->encryption_status[conn_index]) {
 412                         DRM_DEBUG_DRIVER("[HDCP_DM] encryption_status change from %x to %x\n",
 413                                 hdcp_work->encryption_status[conn_index], query.encryption_status);
 414
 415                         hdcp_work->encryption_status[conn_index] =
 416                                 query.encryption_status;
 417
 418                         DRM_DEBUG_DRIVER("[HDCP_DM] trigger property_update_work\n");
 419
 420                         schedule_work(&hdcp_work->property_update_work);
 421                 }
 422         }
 423
 424         mutex_unlock(&hdcp_work->mutex);
 425 }
 426
 427 static void event_watchdog_timer(struct work_struct *work)
 428 {
 429         struct hdcp_workqueue *hdcp_work;
 430
 431         hdcp_work = container_of(to_delayed_work(work),
 432                                       struct hdcp_workqueue,
 433                                       watchdog_timer_dwork);
 434
 435         mutex_lock(&hdcp_work->mutex);
 436
 437         cancel_delayed_work(&hdcp_work->watchdog_timer_dwork);
 438
 439         mod_hdcp_process_event(&hdcp_work->hdcp,
 440                                MOD_HDCP_EVENT_WATCHDOG_TIMEOUT,
 441                                &hdcp_work->output);
 442
 443         process_output(hdcp_work);
 444
 445         mutex_unlock(&hdcp_work->mutex);
 446
 447 }
 448
 449 static void event_cpirq(struct work_struct *work)
 450 {
 451         struct hdcp_workqueue *hdcp_work;
 452
 453         hdcp_work = container_of(work, struct hdcp_workqueue, cpirq_work);
 454
 455         mutex_lock(&hdcp_work->mutex);
 456
 457         mod_hdcp_process_event(&hdcp_work->hdcp, MOD_HDCP_EVENT_CPIRQ, &hdcp_work->output);
 458
 459         process_output(hdcp_work);
 460
 461         mutex_unlock(&hdcp_work->mutex);
 462
 463 }
 464
 465
 466 void hdcp_destroy(struct kobject *kobj, struct hdcp_workqueue *hdcp_work)
 467 {
 468         int i = 0;
 469
 470         for (i = 0; i < hdcp_work->max_link; i++) {
 471                 cancel_delayed_work_sync(&hdcp_work[i].callback_dwork);
 472                 cancel_delayed_work_sync(&hdcp_work[i].watchdog_timer_dwork);
 473         }
 474
 475         sysfs_remove_bin_file(kobj, &hdcp_work[0].attr);
 476         kfree(hdcp_work->srm);
 477         kfree(hdcp_work->srm_temp);
 478         kfree(hdcp_work);
 479 }
 480
 481
 482 static bool enable_assr(void *handle, struct dc_link *link)
 483 {
 484
 485         struct hdcp_workqueue *hdcp_work = handle;
 486         struct mod_hdcp hdcp = hdcp_work->hdcp;
 487         struct psp_context *psp = hdcp.config.psp.handle;
 488         struct ta_dtm_shared_memory *dtm_cmd;
 489         bool res = true;
 490
 491         if (!psp->dtm_context.context.initialized) {
 492                 DRM_INFO("Failed to enable ASSR, DTM TA is not initialized.");
 493                 return false;
 494         }
 495
 496         dtm_cmd = (struct ta_dtm_shared_memory *)psp->dtm_context.context.mem_context.shared_buf;
 497
 498         mutex_lock(&psp->dtm_context.mutex);
 499         memset(dtm_cmd, 0, sizeof(struct ta_dtm_shared_memory));
 500
 501         dtm_cmd->cmd_id = TA_DTM_COMMAND__TOPOLOGY_ASSR_ENABLE;
 502         dtm_cmd->dtm_in_message.topology_assr_enable.display_topology_dig_be_index = link->link_enc_hw_inst;
 503         dtm_cmd->dtm_status = TA_DTM_STATUS__GENERIC_FAILURE;
 504
 505         psp_dtm_invoke(psp, dtm_cmd->cmd_id);
 506
 507         if (dtm_cmd->dtm_status != TA_DTM_STATUS__SUCCESS) {
 508                 DRM_INFO("Failed to enable ASSR");
 509                 res = false;
 510         }
 511
 512         mutex_unlock(&psp->dtm_context.mutex);
 513
 514         return res;
 515 }
 516
 517 static void update_config(void *handle, struct cp_psp_stream_config *config)
 518 {
 519         struct hdcp_workqueue *hdcp_work = handle;
 520         struct amdgpu_dm_connector *aconnector = config->dm_stream_ctx;
 521         int link_index = aconnector->dc_link->link_index;
 522         struct mod_hdcp_display *display = &hdcp_work[link_index].display;
 523         struct mod_hdcp_link *link = &hdcp_work[link_index].link;
 524         struct drm_connector_state *conn_state;
 525         struct dc_sink *sink = NULL;
 526         bool link_is_hdcp14 = false;
 527
 528         if (config->dpms_off) {
 529                 hdcp_remove_display(hdcp_work, link_index, aconnector);
 530                 return;
 531         }
 532
 533         memset(display, 0, sizeof(*display));
 534         memset(link, 0, sizeof(*link));
 535
 536         display->index = aconnector->base.index;
 537         display->state = MOD_HDCP_DISPLAY_ACTIVE;
 538
 539         if (aconnector->dc_sink)
 540                 sink = aconnector->dc_sink;
 541         else if (aconnector->dc_em_sink)
 542                 sink = aconnector->dc_em_sink;
 543
 544         if (sink != NULL)
 545                 link->mode = mod_hdcp_signal_type_to_operation_mode(sink->sink_signal);
 546
 547         display->controller = CONTROLLER_ID_D0 + config->otg_inst;
 548         display->dig_fe = config->dig_fe;
 549         link->dig_be = config->dig_be;
 550         link->ddc_line = aconnector->dc_link->ddc_hw_inst + 1;
 551         display->stream_enc_idx = config->stream_enc_idx;
 552         link->link_enc_idx = config->link_enc_idx;
 553         link->dio_output_id = config->dio_output_idx;
 554         link->phy_idx = config->phy_idx;
 555
 556         if (sink)
 557                 link_is_hdcp14 = dc_link_is_hdcp14(aconnector->dc_link, sink->sink_signal);
 558         link->hdcp_supported_informational = link_is_hdcp14;
 559         link->dp.rev = aconnector->dc_link->dpcd_caps.dpcd_rev.raw;
 560         link->dp.assr_enabled = config->assr_enabled;
 561         link->dp.mst_enabled = config->mst_enabled;
 562         link->dp.dp2_enabled = config->dp2_enabled;
 563         link->dp.usb4_enabled = config->usb4_enabled;
 564         display->adjust.disable = MOD_HDCP_DISPLAY_DISABLE_AUTHENTICATION;
 565         link->adjust.auth_delay = 2;
 566         link->adjust.hdcp1.disable = 0;
 567         conn_state = aconnector->base.state;
 568
 569         DRM_DEBUG_DRIVER("[HDCP_DM] display %d, CP %d, type %d\n", aconnector->base.index,
 570                         (!!aconnector->base.state) ? aconnector->base.state->content_protection : -1,
 571                         (!!aconnector->base.state) ? aconnector->base.state->hdcp_content_type : -1);
 572
 573         if (conn_state)
 574                 hdcp_update_display(hdcp_work, link_index, aconnector,
 575                         conn_state->hdcp_content_type, false);
 576 }
 577
 578
 579 /* NOTE: From the usermodes prospective you only need to call write *ONCE*, the kernel
 580  *      will automatically call once or twice depending on the size
 581  *
 582  * call: "cat file > /sys/class/drm/card0/device/hdcp_srm" from usermode no matter what the size is
 583  *
 584  * The kernel can only send PAGE_SIZE at once and since MAX_SRM_FILE(5120) > PAGE_SIZE(4096),
 585  * srm_data_write can be called multiple times.
 586  *
 587  * sysfs interface doesn't tell us the size we will get so we are sending partial SRMs to psp and on
 588  * the last call we will send the full SRM. PSP will fail on every call before the last.
 589  *
 590  * This means we don't know if the SRM is good until the last call. And because of this limitation we
 591  * cannot throw errors early as it will stop the kernel from writing to sysfs
 592  *
 593  * Example 1:
 594  *      Good SRM size = 5096
 595  *      first call to write 4096 -> PSP fails
 596  *      Second call to write 1000 -> PSP Pass -> SRM is set
 597  *
 598  * Example 2:
 599  *      Bad SRM size = 4096
 600  *      first call to write 4096 -> PSP fails (This is the same as above, but we don't know if this
 601  *      is the last call)
 602  *
 603  * Solution?:
 604  *      1: Parse the SRM? -> It is signed so we don't know the EOF
 605  *      2: We can have another sysfs that passes the size before calling set. -> simpler solution
 606  *      below
 607  *
 608  * Easy Solution:
 609  * Always call get after Set to verify if set was successful.
 610  * +----------------------+
 611  * |   Why it works:      |
 612  * +----------------------+
 613  * PSP will only update its srm if its older than the one we are trying to load.
 614  * Always do set first than get.
 615  *      -if we try to "1. SET" a older version PSP will reject it and we can "2. GET" the newer
 616  *      version and save it
 617  *
 618  *      -if we try to "1. SET" a newer version PSP will accept it and we can "2. GET" the
 619  *      same(newer) version back and save it
 620  *
 621  *      -if we try to "1. SET" a newer version and PSP rejects it. That means the format is
 622  *      incorrect/corrupted and we should correct our SRM by getting it from PSP
 623  */
 624 static ssize_t srm_data_write(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buffer,
 625                               loff_t pos, size_t count)
 626 {
 627         struct hdcp_workqueue *work;
 628         uint32_t srm_version = 0;
 629
 630         work = container_of(bin_attr, struct hdcp_workqueue, attr);
 631         link_lock(work, true);
 632
 633         memcpy(work->srm_temp + pos, buffer, count);
 634
 635         if (!psp_set_srm(work->hdcp.config.psp.handle, work->srm_temp, pos + count, &srm_version)) {
 636                 DRM_DEBUG_DRIVER("HDCP SRM SET version 0x%X", srm_version);
 637                 memcpy(work->srm, work->srm_temp, pos + count);
 638                 work->srm_size = pos + count;
 639                 work->srm_version = srm_version;
 640         }
 641
 642
 643         link_lock(work, false);
 644
 645         return count;
 646 }
 647
 648 static ssize_t srm_data_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buffer,
 649                              loff_t pos, size_t count)
 650 {
 651         struct hdcp_workqueue *work;
 652         uint8_t *srm = NULL;
 653         uint32_t srm_version;
 654         uint32_t srm_size;
 655         size_t ret = count;
 656
 657         work = container_of(bin_attr, struct hdcp_workqueue, attr);
 658
 659         link_lock(work, true);
 660
 661         srm = psp_get_srm(work->hdcp.config.psp.handle, &srm_version, &srm_size);
 662
 663         if (!srm) {
 664                 ret = -EINVAL;
 665                 goto ret;
 666         }
 667
 668         if (pos >= srm_size)
 669                 ret = 0;
 670
 671         if (srm_size - pos < count) {
 672                 memcpy(buffer, srm + pos, srm_size - pos);
 673                 ret = srm_size - pos;
 674                 goto ret;
 675         }
 676
 677         memcpy(buffer, srm + pos, count);
 678
 679 ret:
 680         link_lock(work, false);
 681         return ret;
 682 }
 683
 684 /* From the hdcp spec (5.Renewability) SRM needs to be stored in a non-volatile memory.
 685  *
 686  * For example,
 687  *      if Application "A" sets the SRM (ver 2) and we reboot/suspend and later when Application "B"
 688  *      needs to use HDCP, the version in PSP should be SRM(ver 2). So SRM should be persistent
 689  *      across boot/reboots/suspend/resume/shutdown
 690  *
 691  * Currently when the system goes down (suspend/shutdown) the SRM is cleared from PSP. For HDCP we need
 692  * to make the SRM persistent.
 693  *
 694  * -PSP owns the checking of SRM but doesn't have the ability to store it in a non-volatile memory.
 695  * -The kernel cannot write to the file systems.
 696  * -So we need usermode to do this for us, which is why an interface for usermode is needed
 697  *
 698  *
 699  *
 700  * Usermode can read/write to/from PSP using the sysfs interface
 701  * For example:
 702  *      to save SRM from PSP to storage : cat /sys/class/drm/card0/device/hdcp_srm > srmfile
 703  *      to load from storage to PSP: cat srmfile > /sys/class/drm/card0/device/hdcp_srm
 704  */
 705 static const struct bin_attribute data_attr = {
 706         .attr = {.name = "hdcp_srm", .mode = 0664},
 707         .size = PSP_HDCP_SRM_FIRST_GEN_MAX_SIZE, /* Limit SRM size */
 708         .write = srm_data_write,
 709         .read = srm_data_read,
 710 };
 711
 712
 713 struct hdcp_workqueue *hdcp_create_workqueue(struct amdgpu_device *adev, struct cp_psp *cp_psp, struct dc *dc)
 714 {
 715
 716         int max_caps = dc->caps.max_links;
 717         struct hdcp_workqueue *hdcp_work;
 718         int i = 0;
 719
 720         hdcp_work = kcalloc(max_caps, sizeof(*hdcp_work), GFP_KERNEL);
 721         if (ZERO_OR_NULL_PTR(hdcp_work))
 722                 return NULL;
 723
 724         hdcp_work->srm = kcalloc(PSP_HDCP_SRM_FIRST_GEN_MAX_SIZE, sizeof(*hdcp_work->srm), GFP_KERNEL);
 725
 726         if (hdcp_work->srm == NULL)
 727                 goto fail_alloc_context;
 728
 729         hdcp_work->srm_temp = kcalloc(PSP_HDCP_SRM_FIRST_GEN_MAX_SIZE, sizeof(*hdcp_work->srm_temp), GFP_KERNEL);
 730
 731         if (hdcp_work->srm_temp == NULL)
 732                 goto fail_alloc_context;
 733
 734         hdcp_work->max_link = max_caps;
 735
 736         for (i = 0; i < max_caps; i++) {
 737                 mutex_init(&hdcp_work[i].mutex);
 738
 739                 INIT_WORK(&hdcp_work[i].cpirq_work, event_cpirq);
 740                 INIT_WORK(&hdcp_work[i].property_update_work, event_property_update);
 741                 INIT_DELAYED_WORK(&hdcp_work[i].callback_dwork, event_callback);
 742                 INIT_DELAYED_WORK(&hdcp_work[i].watchdog_timer_dwork, event_watchdog_timer);
 743                 INIT_DELAYED_WORK(&hdcp_work[i].property_validate_dwork, event_property_validate);
 744
 745                 hdcp_work[i].hdcp.config.psp.handle = &adev->psp;
 746                 if (dc->ctx->dce_version == DCN_VERSION_3_1 ||
 747                     dc->ctx->dce_version == DCN_VERSION_3_14 ||
 748                     dc->ctx->dce_version == DCN_VERSION_3_15 ||
 749                     dc->ctx->dce_version == DCN_VERSION_3_16)
 750                         hdcp_work[i].hdcp.config.psp.caps.dtm_v3_supported = 1;
 751                 hdcp_work[i].hdcp.config.ddc.handle = dc_get_link_at_index(dc, i);
 752                 hdcp_work[i].hdcp.config.ddc.funcs.write_i2c = lp_write_i2c;
 753                 hdcp_work[i].hdcp.config.ddc.funcs.read_i2c = lp_read_i2c;
 754                 hdcp_work[i].hdcp.config.ddc.funcs.write_dpcd = lp_write_dpcd;
 755                 hdcp_work[i].hdcp.config.ddc.funcs.read_dpcd = lp_read_dpcd;
 756
 757                 memset(hdcp_work[i].aconnector, 0,
 758                        sizeof(struct amdgpu_dm_connector *) *
 759                                AMDGPU_DM_MAX_DISPLAY_INDEX);
 760                 memset(hdcp_work[i].encryption_status, 0,
 761                        sizeof(enum mod_hdcp_encryption_status) *
 762                                AMDGPU_DM_MAX_DISPLAY_INDEX);
 763         }
 764
 765         cp_psp->funcs.update_stream_config = update_config;
 766         cp_psp->funcs.enable_assr = enable_assr;
 767         cp_psp->handle = hdcp_work;
 768
 769         /* File created at /sys/class/drm/card0/device/hdcp_srm*/
 770         hdcp_work[0].attr = data_attr;
 771         sysfs_bin_attr_init(&hdcp_work[0].attr);
 772
 773         if (sysfs_create_bin_file(&adev->dev->kobj, &hdcp_work[0].attr))
 774                 DRM_WARN("Failed to create device file hdcp_srm");
 775
 776         return hdcp_work;
 777
 778 fail_alloc_context:
 779         kfree(hdcp_work->srm);
 780         kfree(hdcp_work->srm_temp);
 781         kfree(hdcp_work);
 782
 783         return NULL;
 784
 785
 786
 787 }
 788
 789
 790