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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c')
-rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c | 779 |
1 files changed, 779 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c new file mode 100644 index 0000000000..20cfc5be21 --- /dev/null +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c @@ -0,0 +1,779 @@ +/* + * Copyright 2019 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: AMD + * + */ + +#include "amdgpu_dm_hdcp.h" +#include "amdgpu.h" +#include "amdgpu_dm.h" +#include "dm_helpers.h" +#include <drm/display/drm_hdcp_helper.h> +#include "hdcp_psp.h" + +/* + * If the SRM version being loaded is less than or equal to the + * currently loaded SRM, psp will return 0xFFFF as the version + */ +#define PSP_SRM_VERSION_MAX 0xFFFF + +static bool +lp_write_i2c(void *handle, uint32_t address, const uint8_t *data, uint32_t size) +{ + struct dc_link *link = handle; + struct i2c_payload i2c_payloads[] = {{true, address, size, (void *)data} }; + struct i2c_command cmd = {i2c_payloads, 1, I2C_COMMAND_ENGINE_HW, + link->dc->caps.i2c_speed_in_khz}; + + return dm_helpers_submit_i2c(link->ctx, link, &cmd); +} + +static bool +lp_read_i2c(void *handle, uint32_t address, uint8_t offset, uint8_t *data, uint32_t size) +{ + struct dc_link *link = handle; + + struct i2c_payload i2c_payloads[] = {{true, address, 1, &offset}, + {false, address, size, data} }; + struct i2c_command cmd = {i2c_payloads, 2, I2C_COMMAND_ENGINE_HW, + link->dc->caps.i2c_speed_in_khz}; + + return dm_helpers_submit_i2c(link->ctx, link, &cmd); +} + +static bool +lp_write_dpcd(void *handle, uint32_t address, const uint8_t *data, uint32_t size) +{ + struct dc_link *link = handle; + + return dm_helpers_dp_write_dpcd(link->ctx, link, address, data, size); +} + +static bool +lp_read_dpcd(void *handle, uint32_t address, uint8_t *data, uint32_t size) +{ + struct dc_link *link = handle; + + return dm_helpers_dp_read_dpcd(link->ctx, link, address, data, size); +} + +static uint8_t *psp_get_srm(struct psp_context *psp, uint32_t *srm_version, uint32_t *srm_size) +{ + struct ta_hdcp_shared_memory *hdcp_cmd; + + if (!psp->hdcp_context.context.initialized) { + DRM_WARN("Failed to get hdcp srm. HDCP TA is not initialized."); + return NULL; + } + + hdcp_cmd = (struct ta_hdcp_shared_memory *)psp->hdcp_context.context.mem_context.shared_buf; + memset(hdcp_cmd, 0, sizeof(struct ta_hdcp_shared_memory)); + + hdcp_cmd->cmd_id = TA_HDCP_COMMAND__HDCP_GET_SRM; + psp_hdcp_invoke(psp, hdcp_cmd->cmd_id); + + if (hdcp_cmd->hdcp_status != TA_HDCP_STATUS__SUCCESS) + return NULL; + + *srm_version = hdcp_cmd->out_msg.hdcp_get_srm.srm_version; + *srm_size = hdcp_cmd->out_msg.hdcp_get_srm.srm_buf_size; + + return hdcp_cmd->out_msg.hdcp_get_srm.srm_buf; +} + +static int psp_set_srm(struct psp_context *psp, + u8 *srm, uint32_t srm_size, uint32_t *srm_version) +{ + struct ta_hdcp_shared_memory *hdcp_cmd; + + if (!psp->hdcp_context.context.initialized) { + DRM_WARN("Failed to get hdcp srm. HDCP TA is not initialized."); + return -EINVAL; + } + + hdcp_cmd = (struct ta_hdcp_shared_memory *)psp->hdcp_context.context.mem_context.shared_buf; + memset(hdcp_cmd, 0, sizeof(struct ta_hdcp_shared_memory)); + + memcpy(hdcp_cmd->in_msg.hdcp_set_srm.srm_buf, srm, srm_size); + hdcp_cmd->in_msg.hdcp_set_srm.srm_buf_size = srm_size; + hdcp_cmd->cmd_id = TA_HDCP_COMMAND__HDCP_SET_SRM; + + psp_hdcp_invoke(psp, hdcp_cmd->cmd_id); + + if (hdcp_cmd->hdcp_status != TA_HDCP_STATUS__SUCCESS || + hdcp_cmd->out_msg.hdcp_set_srm.valid_signature != 1 || + hdcp_cmd->out_msg.hdcp_set_srm.srm_version == PSP_SRM_VERSION_MAX) + return -EINVAL; + + *srm_version = hdcp_cmd->out_msg.hdcp_set_srm.srm_version; + return 0; +} + +static void process_output(struct hdcp_workqueue *hdcp_work) +{ + struct mod_hdcp_output output = hdcp_work->output; + + if (output.callback_stop) + cancel_delayed_work(&hdcp_work->callback_dwork); + + if (output.callback_needed) + schedule_delayed_work(&hdcp_work->callback_dwork, + msecs_to_jiffies(output.callback_delay)); + + if (output.watchdog_timer_stop) + cancel_delayed_work(&hdcp_work->watchdog_timer_dwork); + + if (output.watchdog_timer_needed) + schedule_delayed_work(&hdcp_work->watchdog_timer_dwork, + msecs_to_jiffies(output.watchdog_timer_delay)); + + schedule_delayed_work(&hdcp_work->property_validate_dwork, msecs_to_jiffies(0)); +} + +static void link_lock(struct hdcp_workqueue *work, bool lock) +{ + int i = 0; + + for (i = 0; i < work->max_link; i++) { + if (lock) + mutex_lock(&work[i].mutex); + else + mutex_unlock(&work[i].mutex); + } +} + +void hdcp_update_display(struct hdcp_workqueue *hdcp_work, + unsigned int link_index, + struct amdgpu_dm_connector *aconnector, + u8 content_type, + bool enable_encryption) +{ + struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index]; + struct mod_hdcp_link_adjustment link_adjust; + struct mod_hdcp_display_adjustment display_adjust; + unsigned int conn_index = aconnector->base.index; + + mutex_lock(&hdcp_w->mutex); + hdcp_w->aconnector[conn_index] = aconnector; + + memset(&link_adjust, 0, sizeof(link_adjust)); + memset(&display_adjust, 0, sizeof(display_adjust)); + + if (enable_encryption) { + /* Explicitly set the saved SRM as sysfs call will be after we already enabled hdcp + * (s3 resume case) + */ + if (hdcp_work->srm_size > 0) + psp_set_srm(hdcp_work->hdcp.config.psp.handle, hdcp_work->srm, + hdcp_work->srm_size, + &hdcp_work->srm_version); + + display_adjust.disable = MOD_HDCP_DISPLAY_NOT_DISABLE; + + link_adjust.auth_delay = 2; + + if (content_type == DRM_MODE_HDCP_CONTENT_TYPE0) { + link_adjust.hdcp2.force_type = MOD_HDCP_FORCE_TYPE_0; + } else if (content_type == DRM_MODE_HDCP_CONTENT_TYPE1) { + link_adjust.hdcp1.disable = 1; + link_adjust.hdcp2.force_type = MOD_HDCP_FORCE_TYPE_1; + } + + schedule_delayed_work(&hdcp_w->property_validate_dwork, + msecs_to_jiffies(DRM_HDCP_CHECK_PERIOD_MS)); + } else { + display_adjust.disable = MOD_HDCP_DISPLAY_DISABLE_AUTHENTICATION; + hdcp_w->encryption_status[conn_index] = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF; + cancel_delayed_work(&hdcp_w->property_validate_dwork); + } + + mod_hdcp_update_display(&hdcp_w->hdcp, conn_index, &link_adjust, &display_adjust, &hdcp_w->output); + + process_output(hdcp_w); + mutex_unlock(&hdcp_w->mutex); +} + +static void hdcp_remove_display(struct hdcp_workqueue *hdcp_work, + unsigned int link_index, + struct amdgpu_dm_connector *aconnector) +{ + struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index]; + struct drm_connector_state *conn_state = aconnector->base.state; + unsigned int conn_index = aconnector->base.index; + + mutex_lock(&hdcp_w->mutex); + hdcp_w->aconnector[conn_index] = aconnector; + + /* the removal of display will invoke auth reset -> hdcp destroy and + * we'd expect the Content Protection (CP) property changed back to + * DESIRED if at the time ENABLED. CP property change should occur + * before the element removed from linked list. + */ + if (conn_state && conn_state->content_protection == DRM_MODE_CONTENT_PROTECTION_ENABLED) { + conn_state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED; + + DRM_DEBUG_DRIVER("[HDCP_DM] display %d, CP 2 -> 1, type %u, DPMS %u\n", + aconnector->base.index, conn_state->hdcp_content_type, + aconnector->base.dpms); + } + + mod_hdcp_remove_display(&hdcp_w->hdcp, aconnector->base.index, &hdcp_w->output); + + process_output(hdcp_w); + mutex_unlock(&hdcp_w->mutex); +} + +void hdcp_reset_display(struct hdcp_workqueue *hdcp_work, unsigned int link_index) +{ + struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index]; + unsigned int conn_index; + + mutex_lock(&hdcp_w->mutex); + + mod_hdcp_reset_connection(&hdcp_w->hdcp, &hdcp_w->output); + + cancel_delayed_work(&hdcp_w->property_validate_dwork); + + for (conn_index = 0; conn_index < AMDGPU_DM_MAX_DISPLAY_INDEX; conn_index++) { + hdcp_w->encryption_status[conn_index] = + MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF; + } + + process_output(hdcp_w); + + mutex_unlock(&hdcp_w->mutex); +} + +void hdcp_handle_cpirq(struct hdcp_workqueue *hdcp_work, unsigned int link_index) +{ + struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index]; + + schedule_work(&hdcp_w->cpirq_work); +} + +static void event_callback(struct work_struct *work) +{ + struct hdcp_workqueue *hdcp_work; + + hdcp_work = container_of(to_delayed_work(work), struct hdcp_workqueue, + callback_dwork); + + mutex_lock(&hdcp_work->mutex); + + cancel_delayed_work(&hdcp_work->callback_dwork); + + mod_hdcp_process_event(&hdcp_work->hdcp, MOD_HDCP_EVENT_CALLBACK, + &hdcp_work->output); + + process_output(hdcp_work); + + mutex_unlock(&hdcp_work->mutex); +} + +static void event_property_update(struct work_struct *work) +{ + struct hdcp_workqueue *hdcp_work = container_of(work, struct hdcp_workqueue, + property_update_work); + struct amdgpu_dm_connector *aconnector = NULL; + struct drm_device *dev; + long ret; + unsigned int conn_index; + struct drm_connector *connector; + struct drm_connector_state *conn_state; + + for (conn_index = 0; conn_index < AMDGPU_DM_MAX_DISPLAY_INDEX; conn_index++) { + aconnector = hdcp_work->aconnector[conn_index]; + + if (!aconnector) + continue; + + connector = &aconnector->base; + + /* check if display connected */ + if (connector->status != connector_status_connected) + continue; + + conn_state = aconnector->base.state; + + if (!conn_state) + continue; + + dev = connector->dev; + + if (!dev) + continue; + + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); + mutex_lock(&hdcp_work->mutex); + + if (conn_state->commit) { + ret = wait_for_completion_interruptible_timeout(&conn_state->commit->hw_done, + 10 * HZ); + if (ret == 0) { + DRM_ERROR("HDCP state unknown! Setting it to DESIRED\n"); + hdcp_work->encryption_status[conn_index] = + MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF; + } + } + if (hdcp_work->encryption_status[conn_index] != + MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF) { + if (conn_state->hdcp_content_type == + DRM_MODE_HDCP_CONTENT_TYPE0 && + hdcp_work->encryption_status[conn_index] <= + MOD_HDCP_ENCRYPTION_STATUS_HDCP2_TYPE0_ON) { + DRM_DEBUG_DRIVER("[HDCP_DM] DRM_MODE_CONTENT_PROTECTION_ENABLED\n"); + drm_hdcp_update_content_protection(connector, + DRM_MODE_CONTENT_PROTECTION_ENABLED); + } else if (conn_state->hdcp_content_type == + DRM_MODE_HDCP_CONTENT_TYPE1 && + hdcp_work->encryption_status[conn_index] == + MOD_HDCP_ENCRYPTION_STATUS_HDCP2_TYPE1_ON) { + drm_hdcp_update_content_protection(connector, + DRM_MODE_CONTENT_PROTECTION_ENABLED); + } + } else { + DRM_DEBUG_DRIVER("[HDCP_DM] DRM_MODE_CONTENT_PROTECTION_DESIRED\n"); + drm_hdcp_update_content_protection(connector, + DRM_MODE_CONTENT_PROTECTION_DESIRED); + } + mutex_unlock(&hdcp_work->mutex); + drm_modeset_unlock(&dev->mode_config.connection_mutex); + } +} + +static void event_property_validate(struct work_struct *work) +{ + struct hdcp_workqueue *hdcp_work = + container_of(to_delayed_work(work), struct hdcp_workqueue, property_validate_dwork); + struct mod_hdcp_display_query query; + struct amdgpu_dm_connector *aconnector; + unsigned int conn_index; + + mutex_lock(&hdcp_work->mutex); + + for (conn_index = 0; conn_index < AMDGPU_DM_MAX_DISPLAY_INDEX; + conn_index++) { + aconnector = hdcp_work->aconnector[conn_index]; + + if (!aconnector) + continue; + + /* check if display connected */ + if (aconnector->base.status != connector_status_connected) + continue; + + if (!aconnector->base.state) + continue; + + query.encryption_status = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF; + mod_hdcp_query_display(&hdcp_work->hdcp, aconnector->base.index, + &query); + + DRM_DEBUG_DRIVER("[HDCP_DM] disp %d, connector->CP %u, (query, work): (%d, %d)\n", + aconnector->base.index, + aconnector->base.state->content_protection, + query.encryption_status, + hdcp_work->encryption_status[conn_index]); + + if (query.encryption_status != + hdcp_work->encryption_status[conn_index]) { + DRM_DEBUG_DRIVER("[HDCP_DM] encryption_status change from %x to %x\n", + hdcp_work->encryption_status[conn_index], + query.encryption_status); + + hdcp_work->encryption_status[conn_index] = + query.encryption_status; + + DRM_DEBUG_DRIVER("[HDCP_DM] trigger property_update_work\n"); + + schedule_work(&hdcp_work->property_update_work); + } + } + + mutex_unlock(&hdcp_work->mutex); +} + +static void event_watchdog_timer(struct work_struct *work) +{ + struct hdcp_workqueue *hdcp_work; + + hdcp_work = container_of(to_delayed_work(work), + struct hdcp_workqueue, + watchdog_timer_dwork); + + mutex_lock(&hdcp_work->mutex); + + cancel_delayed_work(&hdcp_work->watchdog_timer_dwork); + + mod_hdcp_process_event(&hdcp_work->hdcp, + MOD_HDCP_EVENT_WATCHDOG_TIMEOUT, + &hdcp_work->output); + + process_output(hdcp_work); + + mutex_unlock(&hdcp_work->mutex); +} + +static void event_cpirq(struct work_struct *work) +{ + struct hdcp_workqueue *hdcp_work; + + hdcp_work = container_of(work, struct hdcp_workqueue, cpirq_work); + + mutex_lock(&hdcp_work->mutex); + + mod_hdcp_process_event(&hdcp_work->hdcp, MOD_HDCP_EVENT_CPIRQ, &hdcp_work->output); + + process_output(hdcp_work); + + mutex_unlock(&hdcp_work->mutex); +} + +void hdcp_destroy(struct kobject *kobj, struct hdcp_workqueue *hdcp_work) +{ + int i = 0; + + for (i = 0; i < hdcp_work->max_link; i++) { + cancel_delayed_work_sync(&hdcp_work[i].callback_dwork); + cancel_delayed_work_sync(&hdcp_work[i].watchdog_timer_dwork); + } + + sysfs_remove_bin_file(kobj, &hdcp_work[0].attr); + kfree(hdcp_work->srm); + kfree(hdcp_work->srm_temp); + kfree(hdcp_work); +} + +static bool enable_assr(void *handle, struct dc_link *link) +{ + struct hdcp_workqueue *hdcp_work = handle; + struct mod_hdcp hdcp = hdcp_work->hdcp; + struct psp_context *psp = hdcp.config.psp.handle; + struct ta_dtm_shared_memory *dtm_cmd; + bool res = true; + + if (!psp->dtm_context.context.initialized) { + DRM_INFO("Failed to enable ASSR, DTM TA is not initialized."); + return false; + } + + dtm_cmd = (struct ta_dtm_shared_memory *)psp->dtm_context.context.mem_context.shared_buf; + + mutex_lock(&psp->dtm_context.mutex); + memset(dtm_cmd, 0, sizeof(struct ta_dtm_shared_memory)); + + dtm_cmd->cmd_id = TA_DTM_COMMAND__TOPOLOGY_ASSR_ENABLE; + dtm_cmd->dtm_in_message.topology_assr_enable.display_topology_dig_be_index = + link->link_enc_hw_inst; + dtm_cmd->dtm_status = TA_DTM_STATUS__GENERIC_FAILURE; + + psp_dtm_invoke(psp, dtm_cmd->cmd_id); + + if (dtm_cmd->dtm_status != TA_DTM_STATUS__SUCCESS) { + DRM_INFO("Failed to enable ASSR"); + res = false; + } + + mutex_unlock(&psp->dtm_context.mutex); + + return res; +} + +static void update_config(void *handle, struct cp_psp_stream_config *config) +{ + struct hdcp_workqueue *hdcp_work = handle; + struct amdgpu_dm_connector *aconnector = config->dm_stream_ctx; + int link_index = aconnector->dc_link->link_index; + struct mod_hdcp_display *display = &hdcp_work[link_index].display; + struct mod_hdcp_link *link = &hdcp_work[link_index].link; + struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index]; + struct dc_sink *sink = NULL; + bool link_is_hdcp14 = false; + + if (config->dpms_off) { + hdcp_remove_display(hdcp_work, link_index, aconnector); + return; + } + + memset(display, 0, sizeof(*display)); + memset(link, 0, sizeof(*link)); + + display->index = aconnector->base.index; + display->state = MOD_HDCP_DISPLAY_ACTIVE; + + if (aconnector->dc_sink) + sink = aconnector->dc_sink; + else if (aconnector->dc_em_sink) + sink = aconnector->dc_em_sink; + + if (sink) + link->mode = mod_hdcp_signal_type_to_operation_mode(sink->sink_signal); + + display->controller = CONTROLLER_ID_D0 + config->otg_inst; + display->dig_fe = config->dig_fe; + link->dig_be = config->dig_be; + link->ddc_line = aconnector->dc_link->ddc_hw_inst + 1; + display->stream_enc_idx = config->stream_enc_idx; + link->link_enc_idx = config->link_enc_idx; + link->dio_output_id = config->dio_output_idx; + link->phy_idx = config->phy_idx; + + if (sink) + link_is_hdcp14 = dc_link_is_hdcp14(aconnector->dc_link, sink->sink_signal); + link->hdcp_supported_informational = link_is_hdcp14; + link->dp.rev = aconnector->dc_link->dpcd_caps.dpcd_rev.raw; + link->dp.assr_enabled = config->assr_enabled; + link->dp.mst_enabled = config->mst_enabled; + link->dp.dp2_enabled = config->dp2_enabled; + link->dp.usb4_enabled = config->usb4_enabled; + display->adjust.disable = MOD_HDCP_DISPLAY_DISABLE_AUTHENTICATION; + link->adjust.auth_delay = 2; + link->adjust.hdcp1.disable = 0; + hdcp_w->encryption_status[display->index] = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF; + + DRM_DEBUG_DRIVER("[HDCP_DM] display %d, CP %d, type %d\n", aconnector->base.index, + (!!aconnector->base.state) ? + aconnector->base.state->content_protection : -1, + (!!aconnector->base.state) ? + aconnector->base.state->hdcp_content_type : -1); + + mutex_lock(&hdcp_w->mutex); + + mod_hdcp_add_display(&hdcp_w->hdcp, link, display, &hdcp_w->output); + + process_output(hdcp_w); + mutex_unlock(&hdcp_w->mutex); + +} + +/** + * DOC: Add sysfs interface for set/get srm + * + * NOTE: From the usermodes prospective you only need to call write *ONCE*, the kernel + * will automatically call once or twice depending on the size + * + * call: "cat file > /sys/class/drm/card0/device/hdcp_srm" from usermode no matter what the size is + * + * The kernel can only send PAGE_SIZE at once and since MAX_SRM_FILE(5120) > PAGE_SIZE(4096), + * srm_data_write can be called multiple times. + * + * sysfs interface doesn't tell us the size we will get so we are sending partial SRMs to psp and on + * the last call we will send the full SRM. PSP will fail on every call before the last. + * + * This means we don't know if the SRM is good until the last call. And because of this + * limitation we cannot throw errors early as it will stop the kernel from writing to sysfs + * + * Example 1: + * Good SRM size = 5096 + * first call to write 4096 -> PSP fails + * Second call to write 1000 -> PSP Pass -> SRM is set + * + * Example 2: + * Bad SRM size = 4096 + * first call to write 4096 -> PSP fails (This is the same as above, but we don't know if this + * is the last call) + * + * Solution?: + * 1: Parse the SRM? -> It is signed so we don't know the EOF + * 2: We can have another sysfs that passes the size before calling set. -> simpler solution + * below + * + * Easy Solution: + * Always call get after Set to verify if set was successful. + * +----------------------+ + * | Why it works: | + * +----------------------+ + * PSP will only update its srm if its older than the one we are trying to load. + * Always do set first than get. + * -if we try to "1. SET" a older version PSP will reject it and we can "2. GET" the newer + * version and save it + * + * -if we try to "1. SET" a newer version PSP will accept it and we can "2. GET" the + * same(newer) version back and save it + * + * -if we try to "1. SET" a newer version and PSP rejects it. That means the format is + * incorrect/corrupted and we should correct our SRM by getting it from PSP + */ +static ssize_t srm_data_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buffer, + loff_t pos, size_t count) +{ + struct hdcp_workqueue *work; + u32 srm_version = 0; + + work = container_of(bin_attr, struct hdcp_workqueue, attr); + link_lock(work, true); + + memcpy(work->srm_temp + pos, buffer, count); + + if (!psp_set_srm(work->hdcp.config.psp.handle, work->srm_temp, pos + count, &srm_version)) { + DRM_DEBUG_DRIVER("HDCP SRM SET version 0x%X", srm_version); + memcpy(work->srm, work->srm_temp, pos + count); + work->srm_size = pos + count; + work->srm_version = srm_version; + } + + link_lock(work, false); + + return count; +} + +static ssize_t srm_data_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buffer, + loff_t pos, size_t count) +{ + struct hdcp_workqueue *work; + u8 *srm = NULL; + u32 srm_version; + u32 srm_size; + size_t ret = count; + + work = container_of(bin_attr, struct hdcp_workqueue, attr); + + link_lock(work, true); + + srm = psp_get_srm(work->hdcp.config.psp.handle, &srm_version, &srm_size); + + if (!srm) { + ret = -EINVAL; + goto ret; + } + + if (pos >= srm_size) + ret = 0; + + if (srm_size - pos < count) { + memcpy(buffer, srm + pos, srm_size - pos); + ret = srm_size - pos; + goto ret; + } + + memcpy(buffer, srm + pos, count); + +ret: + link_lock(work, false); + return ret; +} + +/* From the hdcp spec (5.Renewability) SRM needs to be stored in a non-volatile memory. + * + * For example, + * if Application "A" sets the SRM (ver 2) and we reboot/suspend and later when Application "B" + * needs to use HDCP, the version in PSP should be SRM(ver 2). So SRM should be persistent + * across boot/reboots/suspend/resume/shutdown + * + * Currently when the system goes down (suspend/shutdown) the SRM is cleared from PSP. For HDCP + * we need to make the SRM persistent. + * + * -PSP owns the checking of SRM but doesn't have the ability to store it in a non-volatile memory. + * -The kernel cannot write to the file systems. + * -So we need usermode to do this for us, which is why an interface for usermode is needed + * + * + * + * Usermode can read/write to/from PSP using the sysfs interface + * For example: + * to save SRM from PSP to storage : cat /sys/class/drm/card0/device/hdcp_srm > srmfile + * to load from storage to PSP: cat srmfile > /sys/class/drm/card0/device/hdcp_srm + */ +static const struct bin_attribute data_attr = { + .attr = {.name = "hdcp_srm", .mode = 0664}, + .size = PSP_HDCP_SRM_FIRST_GEN_MAX_SIZE, /* Limit SRM size */ + .write = srm_data_write, + .read = srm_data_read, +}; + +struct hdcp_workqueue *hdcp_create_workqueue(struct amdgpu_device *adev, + struct cp_psp *cp_psp, struct dc *dc) +{ + int max_caps = dc->caps.max_links; + struct hdcp_workqueue *hdcp_work; + int i = 0; + + hdcp_work = kcalloc(max_caps, sizeof(*hdcp_work), GFP_KERNEL); + if (ZERO_OR_NULL_PTR(hdcp_work)) + return NULL; + + hdcp_work->srm = kcalloc(PSP_HDCP_SRM_FIRST_GEN_MAX_SIZE, + sizeof(*hdcp_work->srm), GFP_KERNEL); + + if (!hdcp_work->srm) + goto fail_alloc_context; + + hdcp_work->srm_temp = kcalloc(PSP_HDCP_SRM_FIRST_GEN_MAX_SIZE, + sizeof(*hdcp_work->srm_temp), GFP_KERNEL); + + if (!hdcp_work->srm_temp) + goto fail_alloc_context; + + hdcp_work->max_link = max_caps; + + for (i = 0; i < max_caps; i++) { + mutex_init(&hdcp_work[i].mutex); + + INIT_WORK(&hdcp_work[i].cpirq_work, event_cpirq); + INIT_WORK(&hdcp_work[i].property_update_work, event_property_update); + INIT_DELAYED_WORK(&hdcp_work[i].callback_dwork, event_callback); + INIT_DELAYED_WORK(&hdcp_work[i].watchdog_timer_dwork, event_watchdog_timer); + INIT_DELAYED_WORK(&hdcp_work[i].property_validate_dwork, event_property_validate); + + hdcp_work[i].hdcp.config.psp.handle = &adev->psp; + if (dc->ctx->dce_version == DCN_VERSION_3_1 || + dc->ctx->dce_version == DCN_VERSION_3_14 || + dc->ctx->dce_version == DCN_VERSION_3_15 || + dc->ctx->dce_version == DCN_VERSION_3_16) + hdcp_work[i].hdcp.config.psp.caps.dtm_v3_supported = 1; + hdcp_work[i].hdcp.config.ddc.handle = dc_get_link_at_index(dc, i); + hdcp_work[i].hdcp.config.ddc.funcs.write_i2c = lp_write_i2c; + hdcp_work[i].hdcp.config.ddc.funcs.read_i2c = lp_read_i2c; + hdcp_work[i].hdcp.config.ddc.funcs.write_dpcd = lp_write_dpcd; + hdcp_work[i].hdcp.config.ddc.funcs.read_dpcd = lp_read_dpcd; + + memset(hdcp_work[i].aconnector, 0, + sizeof(struct amdgpu_dm_connector *) * + AMDGPU_DM_MAX_DISPLAY_INDEX); + memset(hdcp_work[i].encryption_status, 0, + sizeof(enum mod_hdcp_encryption_status) * + AMDGPU_DM_MAX_DISPLAY_INDEX); + } + + cp_psp->funcs.update_stream_config = update_config; + cp_psp->funcs.enable_assr = enable_assr; + cp_psp->handle = hdcp_work; + + /* File created at /sys/class/drm/card0/device/hdcp_srm*/ + hdcp_work[0].attr = data_attr; + sysfs_bin_attr_init(&hdcp_work[0].attr); + + if (sysfs_create_bin_file(&adev->dev->kobj, &hdcp_work[0].attr)) + DRM_WARN("Failed to create device file hdcp_srm"); + + return hdcp_work; + +fail_alloc_context: + kfree(hdcp_work->srm); + kfree(hdcp_work->srm_temp); + kfree(hdcp_work); + + return NULL; +} + |