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/drm_hdcp.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.hdcp_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.hdcp_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.hdcp_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.hdcp_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 = 0;
 195                         if (content_type == DRM_MODE_HDCP_CONTENT_TYPE0)
 196                                 hdcp_w->link.adjust.hdcp2.force_type = MOD_HDCP_FORCE_TYPE_0;
 197                         else if (content_type == DRM_MODE_HDCP_CONTENT_TYPE1)
 198                                 hdcp_w->link.adjust.hdcp2.force_type = MOD_HDCP_FORCE_TYPE_1;
 199
 200                         schedule_delayed_work(&hdcp_w->property_validate_dwork,
 201                                               msecs_to_jiffies(DRM_HDCP_CHECK_PERIOD_MS));
 202                 } else {
 203                         display->adjust.disable = 1;
 204                         hdcp_w->encryption_status = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF;
 205                         cancel_delayed_work(&hdcp_w->property_validate_dwork);
 206                 }
 207
 208                 display->state = MOD_HDCP_DISPLAY_ACTIVE;
 209         }
 210
 211         mod_hdcp_add_display(&hdcp_w->hdcp, link, display, &hdcp_w->output);
 212
 213         process_output(hdcp_w);
 214         mutex_unlock(&hdcp_w->mutex);
 215 }
 216
 217 static void hdcp_remove_display(struct hdcp_workqueue *hdcp_work,
 218                          unsigned int link_index,
 219                          struct amdgpu_dm_connector *aconnector)
 220 {
 221         struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index];
 222
 223         mutex_lock(&hdcp_w->mutex);
 224         hdcp_w->aconnector = aconnector;
 225
 226         mod_hdcp_remove_display(&hdcp_w->hdcp, aconnector->base.index, &hdcp_w->output);
 227
 228         process_output(hdcp_w);
 229         mutex_unlock(&hdcp_w->mutex);
 230 }
 231 void hdcp_reset_display(struct hdcp_workqueue *hdcp_work, unsigned int link_index)
 232 {
 233         struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index];
 234
 235         mutex_lock(&hdcp_w->mutex);
 236
 237         mod_hdcp_reset_connection(&hdcp_w->hdcp,  &hdcp_w->output);
 238
 239         cancel_delayed_work(&hdcp_w->property_validate_dwork);
 240         hdcp_w->encryption_status = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF;
 241
 242         process_output(hdcp_w);
 243
 244         mutex_unlock(&hdcp_w->mutex);
 245 }
 246
 247 void hdcp_handle_cpirq(struct hdcp_workqueue *hdcp_work, unsigned int link_index)
 248 {
 249         struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index];
 250
 251         schedule_work(&hdcp_w->cpirq_work);
 252 }
 253
 254
 255
 256
 257 static void event_callback(struct work_struct *work)
 258 {
 259         struct hdcp_workqueue *hdcp_work;
 260
 261         hdcp_work = container_of(to_delayed_work(work), struct hdcp_workqueue,
 262                                       callback_dwork);
 263
 264         mutex_lock(&hdcp_work->mutex);
 265
 266         cancel_delayed_work(&hdcp_work->watchdog_timer_dwork);
 267
 268         mod_hdcp_process_event(&hdcp_work->hdcp, MOD_HDCP_EVENT_CALLBACK,
 269                                &hdcp_work->output);
 270
 271         process_output(hdcp_work);
 272
 273         mutex_unlock(&hdcp_work->mutex);
 274
 275
 276 }
 277 static void event_property_update(struct work_struct *work)
 278 {
 279
 280         struct hdcp_workqueue *hdcp_work = container_of(work, struct hdcp_workqueue, property_update_work);
 281         struct amdgpu_dm_connector *aconnector = hdcp_work->aconnector;
 282         struct drm_device *dev = hdcp_work->aconnector->base.dev;
 283         long ret;
 284
 285         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 286         mutex_lock(&hdcp_work->mutex);
 287
 288
 289         if (aconnector->base.state->commit) {
 290                 ret = wait_for_completion_interruptible_timeout(&aconnector->base.state->commit->hw_done, 10 * HZ);
 291
 292                 if (ret == 0) {
 293                         DRM_ERROR("HDCP state unknown! Setting it to DESIRED");
 294                         hdcp_work->encryption_status = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF;
 295                 }
 296         }
 297
 298         if (hdcp_work->encryption_status != MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF) {
 299                 if (aconnector->base.state->hdcp_content_type == DRM_MODE_HDCP_CONTENT_TYPE0 &&
 300                     hdcp_work->encryption_status <= MOD_HDCP_ENCRYPTION_STATUS_HDCP2_TYPE0_ON)
 301                         drm_hdcp_update_content_protection(&aconnector->base, DRM_MODE_CONTENT_PROTECTION_ENABLED);
 302                 else if (aconnector->base.state->hdcp_content_type == DRM_MODE_HDCP_CONTENT_TYPE1 &&
 303                          hdcp_work->encryption_status == MOD_HDCP_ENCRYPTION_STATUS_HDCP2_TYPE1_ON)
 304                         drm_hdcp_update_content_protection(&aconnector->base, DRM_MODE_CONTENT_PROTECTION_ENABLED);
 305         } else {
 306                 drm_hdcp_update_content_protection(&aconnector->base, DRM_MODE_CONTENT_PROTECTION_DESIRED);
 307         }
 308
 309
 310         mutex_unlock(&hdcp_work->mutex);
 311         drm_modeset_unlock(&dev->mode_config.connection_mutex);
 312 }
 313
 314 static void event_property_validate(struct work_struct *work)
 315 {
 316         struct hdcp_workqueue *hdcp_work =
 317                 container_of(to_delayed_work(work), struct hdcp_workqueue, property_validate_dwork);
 318         struct mod_hdcp_display_query query;
 319         struct amdgpu_dm_connector *aconnector = hdcp_work->aconnector;
 320
 321         if (!aconnector)
 322                 return;
 323
 324         mutex_lock(&hdcp_work->mutex);
 325
 326         query.encryption_status = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF;
 327         mod_hdcp_query_display(&hdcp_work->hdcp, aconnector->base.index, &query);
 328
 329         if (query.encryption_status != hdcp_work->encryption_status) {
 330                 hdcp_work->encryption_status = query.encryption_status;
 331                 schedule_work(&hdcp_work->property_update_work);
 332         }
 333
 334         mutex_unlock(&hdcp_work->mutex);
 335 }
 336
 337 static void event_watchdog_timer(struct work_struct *work)
 338 {
 339         struct hdcp_workqueue *hdcp_work;
 340
 341         hdcp_work = container_of(to_delayed_work(work),
 342                                       struct hdcp_workqueue,
 343                                       watchdog_timer_dwork);
 344
 345         mutex_lock(&hdcp_work->mutex);
 346
 347         mod_hdcp_process_event(&hdcp_work->hdcp,
 348                                MOD_HDCP_EVENT_WATCHDOG_TIMEOUT,
 349                                &hdcp_work->output);
 350
 351         process_output(hdcp_work);
 352
 353         mutex_unlock(&hdcp_work->mutex);
 354
 355 }
 356
 357 static void event_cpirq(struct work_struct *work)
 358 {
 359         struct hdcp_workqueue *hdcp_work;
 360
 361         hdcp_work = container_of(work, struct hdcp_workqueue, cpirq_work);
 362
 363         mutex_lock(&hdcp_work->mutex);
 364
 365         mod_hdcp_process_event(&hdcp_work->hdcp, MOD_HDCP_EVENT_CPIRQ, &hdcp_work->output);
 366
 367         process_output(hdcp_work);
 368
 369         mutex_unlock(&hdcp_work->mutex);
 370
 371 }
 372
 373
 374 void hdcp_destroy(struct hdcp_workqueue *hdcp_work)
 375 {
 376         int i = 0;
 377
 378         for (i = 0; i < hdcp_work->max_link; i++) {
 379                 cancel_delayed_work_sync(&hdcp_work[i].callback_dwork);
 380                 cancel_delayed_work_sync(&hdcp_work[i].watchdog_timer_dwork);
 381         }
 382
 383         kfree(hdcp_work->srm);
 384         kfree(hdcp_work->srm_temp);
 385         kfree(hdcp_work);
 386 }
 387
 388 static void update_config(void *handle, struct cp_psp_stream_config *config)
 389 {
 390         struct hdcp_workqueue *hdcp_work = handle;
 391         struct amdgpu_dm_connector *aconnector = config->dm_stream_ctx;
 392         int link_index = aconnector->dc_link->link_index;
 393         struct mod_hdcp_display *display = &hdcp_work[link_index].display;
 394         struct mod_hdcp_link *link = &hdcp_work[link_index].link;
 395
 396         memset(display, 0, sizeof(*display));
 397         memset(link, 0, sizeof(*link));
 398
 399         display->index = aconnector->base.index;
 400
 401         if (config->dpms_off) {
 402                 hdcp_remove_display(hdcp_work, link_index, aconnector);
 403                 return;
 404         }
 405         display->state = MOD_HDCP_DISPLAY_ACTIVE;
 406
 407         if (aconnector->dc_sink != NULL)
 408                 link->mode = mod_hdcp_signal_type_to_operation_mode(aconnector->dc_sink->sink_signal);
 409
 410         display->controller = CONTROLLER_ID_D0 + config->otg_inst;
 411         display->dig_fe = config->stream_enc_inst;
 412         link->dig_be = config->link_enc_inst;
 413         link->ddc_line = aconnector->dc_link->ddc_hw_inst + 1;
 414         link->dp.rev = aconnector->dc_link->dpcd_caps.dpcd_rev.raw;
 415         link->dp.mst_supported = config->mst_supported;
 416         display->adjust.disable = 1;
 417         link->adjust.auth_delay = 2;
 418
 419         hdcp_update_display(hdcp_work, link_index, aconnector, DRM_MODE_HDCP_CONTENT_TYPE0, false);
 420 }
 421
 422
 423 /* NOTE: From the usermodes prospective you only need to call write *ONCE*, the kernel
 424  *      will automatically call once or twice depending on the size
 425  *
 426  * call: "cat file > /sys/class/drm/card0/device/hdcp_srm" from usermode no matter what the size is
 427  *
 428  * The kernel can only send PAGE_SIZE at once and since MAX_SRM_FILE(5120) > PAGE_SIZE(4096),
 429  * srm_data_write can be called multiple times.
 430  *
 431  * sysfs interface doesn't tell us the size we will get so we are sending partial SRMs to psp and on
 432  * the last call we will send the full SRM. PSP will fail on every call before the last.
 433  *
 434  * This means we don't know if the SRM is good until the last call. And because of this limitation we
 435  * cannot throw errors early as it will stop the kernel from writing to sysfs
 436  *
 437  * Example 1:
 438  *      Good SRM size = 5096
 439  *      first call to write 4096 -> PSP fails
 440  *      Second call to write 1000 -> PSP Pass -> SRM is set
 441  *
 442  * Example 2:
 443  *      Bad SRM size = 4096
 444  *      first call to write 4096 -> PSP fails (This is the same as above, but we don't know if this
 445  *      is the last call)
 446  *
 447  * Solution?:
 448  *      1: Parse the SRM? -> It is signed so we don't know the EOF
 449  *      2: We can have another sysfs that passes the size before calling set. -> simpler solution
 450  *      below
 451  *
 452  * Easy Solution:
 453  * Always call get after Set to verify if set was successful.
 454  * +----------------------+
 455  * |   Why it works:      |
 456  * +----------------------+
 457  * PSP will only update its srm if its older than the one we are trying to load.
 458  * Always do set first than get.
 459  *      -if we try to "1. SET" a older version PSP will reject it and we can "2. GET" the newer
 460  *      version and save it
 461  *
 462  *      -if we try to "1. SET" a newer version PSP will accept it and we can "2. GET" the
 463  *      same(newer) version back and save it
 464  *
 465  *      -if we try to "1. SET" a newer version and PSP rejects it. That means the format is
 466  *      incorrect/corrupted and we should correct our SRM by getting it from PSP
 467  */
 468 static ssize_t srm_data_write(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buffer,
 469                               loff_t pos, size_t count)
 470 {
 471         struct hdcp_workqueue *work;
 472         uint32_t srm_version = 0;
 473
 474         work = container_of(bin_attr, struct hdcp_workqueue, attr);
 475         link_lock(work, true);
 476
 477         memcpy(work->srm_temp + pos, buffer, count);
 478
 479         if (!psp_set_srm(work->hdcp.config.psp.handle, work->srm_temp, pos + count, &srm_version)) {
 480                 DRM_DEBUG_DRIVER("HDCP SRM SET version 0x%X", srm_version);
 481                 memcpy(work->srm, work->srm_temp, pos + count);
 482                 work->srm_size = pos + count;
 483                 work->srm_version = srm_version;
 484         }
 485
 486
 487         link_lock(work, false);
 488
 489         return count;
 490 }
 491
 492 static ssize_t srm_data_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buffer,
 493                              loff_t pos, size_t count)
 494 {
 495         struct hdcp_workqueue *work;
 496         uint8_t *srm = NULL;
 497         uint32_t srm_version;
 498         uint32_t srm_size;
 499         size_t ret = count;
 500
 501         work = container_of(bin_attr, struct hdcp_workqueue, attr);
 502
 503         link_lock(work, true);
 504
 505         srm = psp_get_srm(work->hdcp.config.psp.handle, &srm_version, &srm_size);
 506
 507         if (!srm)
 508                 return -EINVAL;
 509
 510         if (pos >= srm_size)
 511                 ret = 0;
 512
 513         if (srm_size - pos < count) {
 514                 memcpy(buffer, srm + pos, srm_size - pos);
 515                 ret = srm_size - pos;
 516                 goto ret;
 517         }
 518
 519         memcpy(buffer, srm + pos, count);
 520
 521 ret:
 522         link_lock(work, false);
 523         return ret;
 524 }
 525
 526 /* From the hdcp spec (5.Renewability) SRM needs to be stored in a non-volatile memory.
 527  *
 528  * For example,
 529  *      if Application "A" sets the SRM (ver 2) and we reboot/suspend and later when Application "B"
 530  *      needs to use HDCP, the version in PSP should be SRM(ver 2). So SRM should be persistent
 531  *      across boot/reboots/suspend/resume/shutdown
 532  *
 533  * Currently when the system goes down (suspend/shutdown) the SRM is cleared from PSP. For HDCP we need
 534  * to make the SRM persistent.
 535  *
 536  * -PSP owns the checking of SRM but doesn't have the ability to store it in a non-volatile memory.
 537  * -The kernel cannot write to the file systems.
 538  * -So we need usermode to do this for us, which is why an interface for usermode is needed
 539  *
 540  *
 541  *
 542  * Usermode can read/write to/from PSP using the sysfs interface
 543  * For example:
 544  *      to save SRM from PSP to storage : cat /sys/class/drm/card0/device/hdcp_srm > srmfile
 545  *      to load from storage to PSP: cat srmfile > /sys/class/drm/card0/device/hdcp_srm
 546  */
 547 static const struct bin_attribute data_attr = {
 548         .attr = {.name = "hdcp_srm", .mode = 0664},
 549         .size = PSP_HDCP_SRM_FIRST_GEN_MAX_SIZE, /* Limit SRM size */
 550         .write = srm_data_write,
 551         .read = srm_data_read,
 552 };
 553
 554
 555 struct hdcp_workqueue *hdcp_create_workqueue(struct amdgpu_device *adev, struct cp_psp *cp_psp, struct dc *dc)
 556 {
 557
 558         int max_caps = dc->caps.max_links;
 559         struct hdcp_workqueue *hdcp_work;
 560         int i = 0;
 561
 562         hdcp_work = kcalloc(max_caps, sizeof(*hdcp_work), GFP_KERNEL);
 563         if (hdcp_work == NULL)
 564                 return NULL;
 565
 566         hdcp_work->srm = kcalloc(PSP_HDCP_SRM_FIRST_GEN_MAX_SIZE, sizeof(*hdcp_work->srm), GFP_KERNEL);
 567
 568         if (hdcp_work->srm == NULL)
 569                 goto fail_alloc_context;
 570
 571         hdcp_work->srm_temp = kcalloc(PSP_HDCP_SRM_FIRST_GEN_MAX_SIZE, sizeof(*hdcp_work->srm_temp), GFP_KERNEL);
 572
 573         if (hdcp_work->srm_temp == NULL)
 574                 goto fail_alloc_context;
 575
 576         hdcp_work->max_link = max_caps;
 577
 578         for (i = 0; i < max_caps; i++) {
 579                 mutex_init(&hdcp_work[i].mutex);
 580
 581                 INIT_WORK(&hdcp_work[i].cpirq_work, event_cpirq);
 582                 INIT_WORK(&hdcp_work[i].property_update_work, event_property_update);
 583                 INIT_DELAYED_WORK(&hdcp_work[i].callback_dwork, event_callback);
 584                 INIT_DELAYED_WORK(&hdcp_work[i].watchdog_timer_dwork, event_watchdog_timer);
 585                 INIT_DELAYED_WORK(&hdcp_work[i].property_validate_dwork, event_property_validate);
 586
 587                 hdcp_work[i].hdcp.config.psp.handle = &adev->psp;
 588                 hdcp_work[i].hdcp.config.ddc.handle = dc_get_link_at_index(dc, i);
 589                 hdcp_work[i].hdcp.config.ddc.funcs.write_i2c = lp_write_i2c;
 590                 hdcp_work[i].hdcp.config.ddc.funcs.read_i2c = lp_read_i2c;
 591                 hdcp_work[i].hdcp.config.ddc.funcs.write_dpcd = lp_write_dpcd;
 592                 hdcp_work[i].hdcp.config.ddc.funcs.read_dpcd = lp_read_dpcd;
 593         }
 594
 595         cp_psp->funcs.update_stream_config = update_config;
 596         cp_psp->handle = hdcp_work;
 597
 598         /* File created at /sys/class/drm/card0/device/hdcp_srm*/
 599         hdcp_work[0].attr = data_attr;
 600
 601         if (sysfs_create_bin_file(&adev->dev->kobj, &hdcp_work[0].attr))
 602                 DRM_WARN("Failed to create device file hdcp_srm");
 603
 604         return hdcp_work;
 605
 606 fail_alloc_context:
 607         kfree(hdcp_work->srm);
 608         kfree(hdcp_work->srm_temp);
 609         kfree(hdcp_work);
 610
 611         return NULL;
 612
 613
 614
 615 }
 616
 617
 618