Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Ramalingam C | 1423 | 93.56% | 6 | 21.43% |
Dave Airlie | 22 | 1.45% | 5 | 17.86% |
Sean Paul | 19 | 1.25% | 2 | 7.14% |
Hans de Goede | 12 | 0.79% | 1 | 3.57% |
David Herrmann | 12 | 0.79% | 1 | 3.57% |
Daniel Vetter | 11 | 0.72% | 4 | 14.29% |
Thomas Hellstrom | 9 | 0.59% | 2 | 7.14% |
Paul Gortmaker | 5 | 0.33% | 1 | 3.57% |
Eric Anholt | 2 | 0.13% | 1 | 3.57% |
Rob Clark | 2 | 0.13% | 1 | 3.57% |
caihuoqing | 1 | 0.07% | 1 | 3.57% |
David Howells | 1 | 0.07% | 1 | 3.57% |
Simon Ser | 1 | 0.07% | 1 | 3.57% |
Thomas Zimmermann | 1 | 0.07% | 1 | 3.57% |
Total | 1521 | 28 |
// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2019 Intel Corporation. * * Authors: * Ramalingam C <ramalingam.c@intel.com> */ #include <linux/device.h> #include <linux/err.h> #include <linux/gfp.h> #include <linux/export.h> #include <linux/slab.h> #include <linux/firmware.h> #include <drm/display/drm_hdcp_helper.h> #include <drm/drm_sysfs.h> #include <drm/drm_print.h> #include <drm/drm_device.h> #include <drm/drm_property.h> #include <drm/drm_mode_object.h> #include <drm/drm_connector.h> static inline void drm_hdcp_print_ksv(const u8 *ksv) { DRM_DEBUG("\t%#02x, %#02x, %#02x, %#02x, %#02x\n", ksv[0], ksv[1], ksv[2], ksv[3], ksv[4]); } static u32 drm_hdcp_get_revoked_ksv_count(const u8 *buf, u32 vrls_length) { u32 parsed_bytes = 0, ksv_count = 0, vrl_ksv_cnt, vrl_sz; while (parsed_bytes < vrls_length) { vrl_ksv_cnt = *buf; ksv_count += vrl_ksv_cnt; vrl_sz = (vrl_ksv_cnt * DRM_HDCP_KSV_LEN) + 1; buf += vrl_sz; parsed_bytes += vrl_sz; } /* * When vrls are not valid, ksvs are not considered. * Hence SRM will be discarded. */ if (parsed_bytes != vrls_length) ksv_count = 0; return ksv_count; } static u32 drm_hdcp_get_revoked_ksvs(const u8 *buf, u8 **revoked_ksv_list, u32 vrls_length) { u32 vrl_ksv_cnt, vrl_ksv_sz, vrl_idx = 0; u32 parsed_bytes = 0, ksv_count = 0; do { vrl_ksv_cnt = *buf; vrl_ksv_sz = vrl_ksv_cnt * DRM_HDCP_KSV_LEN; buf++; DRM_DEBUG("vrl: %d, Revoked KSVs: %d\n", vrl_idx++, vrl_ksv_cnt); memcpy((*revoked_ksv_list) + (ksv_count * DRM_HDCP_KSV_LEN), buf, vrl_ksv_sz); ksv_count += vrl_ksv_cnt; buf += vrl_ksv_sz; parsed_bytes += (vrl_ksv_sz + 1); } while (parsed_bytes < vrls_length); return ksv_count; } static inline u32 get_vrl_length(const u8 *buf) { return drm_hdcp_be24_to_cpu(buf); } static int drm_hdcp_parse_hdcp1_srm(const u8 *buf, size_t count, u8 **revoked_ksv_list, u32 *revoked_ksv_cnt) { struct hdcp_srm_header *header; u32 vrl_length, ksv_count; if (count < (sizeof(struct hdcp_srm_header) + DRM_HDCP_1_4_VRL_LENGTH_SIZE + DRM_HDCP_1_4_DCP_SIG_SIZE)) { DRM_ERROR("Invalid blob length\n"); return -EINVAL; } header = (struct hdcp_srm_header *)buf; DRM_DEBUG("SRM ID: 0x%x, SRM Ver: 0x%x, SRM Gen No: 0x%x\n", header->srm_id, be16_to_cpu(header->srm_version), header->srm_gen_no); WARN_ON(header->reserved); buf = buf + sizeof(*header); vrl_length = get_vrl_length(buf); if (count < (sizeof(struct hdcp_srm_header) + vrl_length) || vrl_length < (DRM_HDCP_1_4_VRL_LENGTH_SIZE + DRM_HDCP_1_4_DCP_SIG_SIZE)) { DRM_ERROR("Invalid blob length or vrl length\n"); return -EINVAL; } /* Length of the all vrls combined */ vrl_length -= (DRM_HDCP_1_4_VRL_LENGTH_SIZE + DRM_HDCP_1_4_DCP_SIG_SIZE); if (!vrl_length) { DRM_ERROR("No vrl found\n"); return -EINVAL; } buf += DRM_HDCP_1_4_VRL_LENGTH_SIZE; ksv_count = drm_hdcp_get_revoked_ksv_count(buf, vrl_length); if (!ksv_count) { DRM_DEBUG("Revoked KSV count is 0\n"); return 0; } *revoked_ksv_list = kcalloc(ksv_count, DRM_HDCP_KSV_LEN, GFP_KERNEL); if (!*revoked_ksv_list) { DRM_ERROR("Out of Memory\n"); return -ENOMEM; } if (drm_hdcp_get_revoked_ksvs(buf, revoked_ksv_list, vrl_length) != ksv_count) { *revoked_ksv_cnt = 0; kfree(*revoked_ksv_list); return -EINVAL; } *revoked_ksv_cnt = ksv_count; return 0; } static int drm_hdcp_parse_hdcp2_srm(const u8 *buf, size_t count, u8 **revoked_ksv_list, u32 *revoked_ksv_cnt) { struct hdcp_srm_header *header; u32 vrl_length, ksv_count, ksv_sz; if (count < (sizeof(struct hdcp_srm_header) + DRM_HDCP_2_VRL_LENGTH_SIZE + DRM_HDCP_2_DCP_SIG_SIZE)) { DRM_ERROR("Invalid blob length\n"); return -EINVAL; } header = (struct hdcp_srm_header *)buf; DRM_DEBUG("SRM ID: 0x%x, SRM Ver: 0x%x, SRM Gen No: 0x%x\n", header->srm_id & DRM_HDCP_SRM_ID_MASK, be16_to_cpu(header->srm_version), header->srm_gen_no); if (header->reserved) return -EINVAL; buf = buf + sizeof(*header); vrl_length = get_vrl_length(buf); if (count < (sizeof(struct hdcp_srm_header) + vrl_length) || vrl_length < (DRM_HDCP_2_VRL_LENGTH_SIZE + DRM_HDCP_2_DCP_SIG_SIZE)) { DRM_ERROR("Invalid blob length or vrl length\n"); return -EINVAL; } /* Length of the all vrls combined */ vrl_length -= (DRM_HDCP_2_VRL_LENGTH_SIZE + DRM_HDCP_2_DCP_SIG_SIZE); if (!vrl_length) { DRM_ERROR("No vrl found\n"); return -EINVAL; } buf += DRM_HDCP_2_VRL_LENGTH_SIZE; ksv_count = (*buf << 2) | DRM_HDCP_2_KSV_COUNT_2_LSBITS(*(buf + 1)); if (!ksv_count) { DRM_DEBUG("Revoked KSV count is 0\n"); return 0; } *revoked_ksv_list = kcalloc(ksv_count, DRM_HDCP_KSV_LEN, GFP_KERNEL); if (!*revoked_ksv_list) { DRM_ERROR("Out of Memory\n"); return -ENOMEM; } ksv_sz = ksv_count * DRM_HDCP_KSV_LEN; buf += DRM_HDCP_2_NO_OF_DEV_PLUS_RESERVED_SZ; DRM_DEBUG("Revoked KSVs: %d\n", ksv_count); memcpy(*revoked_ksv_list, buf, ksv_sz); *revoked_ksv_cnt = ksv_count; return 0; } static inline bool is_srm_version_hdcp1(const u8 *buf) { return *buf == (u8)(DRM_HDCP_1_4_SRM_ID << 4); } static inline bool is_srm_version_hdcp2(const u8 *buf) { return *buf == (u8)(DRM_HDCP_2_SRM_ID << 4 | DRM_HDCP_2_INDICATOR); } static int drm_hdcp_srm_update(const u8 *buf, size_t count, u8 **revoked_ksv_list, u32 *revoked_ksv_cnt) { if (count < sizeof(struct hdcp_srm_header)) return -EINVAL; if (is_srm_version_hdcp1(buf)) return drm_hdcp_parse_hdcp1_srm(buf, count, revoked_ksv_list, revoked_ksv_cnt); else if (is_srm_version_hdcp2(buf)) return drm_hdcp_parse_hdcp2_srm(buf, count, revoked_ksv_list, revoked_ksv_cnt); else return -EINVAL; } static int drm_hdcp_request_srm(struct drm_device *drm_dev, u8 **revoked_ksv_list, u32 *revoked_ksv_cnt) { char fw_name[36] = "display_hdcp_srm.bin"; const struct firmware *fw; int ret; ret = request_firmware_direct(&fw, (const char *)fw_name, drm_dev->dev); if (ret < 0) { *revoked_ksv_cnt = 0; *revoked_ksv_list = NULL; ret = 0; goto exit; } if (fw->size && fw->data) ret = drm_hdcp_srm_update(fw->data, fw->size, revoked_ksv_list, revoked_ksv_cnt); exit: release_firmware(fw); return ret; } /** * drm_hdcp_check_ksvs_revoked - Check the revoked status of the IDs * * @drm_dev: drm_device for which HDCP revocation check is requested * @ksvs: List of KSVs (HDCP receiver IDs) * @ksv_count: KSV count passed in through @ksvs * * This function reads the HDCP System renewability Message(SRM Table) * from userspace as a firmware and parses it for the revoked HDCP * KSVs(Receiver IDs) detected by DCP LLC. Once the revoked KSVs are known, * revoked state of the KSVs in the list passed in by display drivers are * decided and response is sent. * * SRM should be presented in the name of "display_hdcp_srm.bin". * * Format of the SRM table, that userspace needs to write into the binary file, * is defined at: * 1. Renewability chapter on 55th page of HDCP 1.4 specification * https://www.digital-cp.com/sites/default/files/specifications/HDCP%20Specification%20Rev1_4_Secure.pdf * 2. Renewability chapter on 63rd page of HDCP 2.2 specification * https://www.digital-cp.com/sites/default/files/specifications/HDCP%20on%20HDMI%20Specification%20Rev2_2_Final1.pdf * * Returns: * Count of the revoked KSVs or -ve error number in case of the failure. */ int drm_hdcp_check_ksvs_revoked(struct drm_device *drm_dev, u8 *ksvs, u32 ksv_count) { u32 revoked_ksv_cnt = 0, i, j; u8 *revoked_ksv_list = NULL; int ret = 0; ret = drm_hdcp_request_srm(drm_dev, &revoked_ksv_list, &revoked_ksv_cnt); if (ret) return ret; /* revoked_ksv_cnt will be zero when above function failed */ for (i = 0; i < revoked_ksv_cnt; i++) for (j = 0; j < ksv_count; j++) if (!memcmp(&ksvs[j * DRM_HDCP_KSV_LEN], &revoked_ksv_list[i * DRM_HDCP_KSV_LEN], DRM_HDCP_KSV_LEN)) { DRM_DEBUG("Revoked KSV is "); drm_hdcp_print_ksv(&ksvs[j * DRM_HDCP_KSV_LEN]); ret++; } kfree(revoked_ksv_list); return ret; } EXPORT_SYMBOL_GPL(drm_hdcp_check_ksvs_revoked); static struct drm_prop_enum_list drm_cp_enum_list[] = { { DRM_MODE_CONTENT_PROTECTION_UNDESIRED, "Undesired" }, { DRM_MODE_CONTENT_PROTECTION_DESIRED, "Desired" }, { DRM_MODE_CONTENT_PROTECTION_ENABLED, "Enabled" }, }; DRM_ENUM_NAME_FN(drm_get_content_protection_name, drm_cp_enum_list) static struct drm_prop_enum_list drm_hdcp_content_type_enum_list[] = { { DRM_MODE_HDCP_CONTENT_TYPE0, "HDCP Type0" }, { DRM_MODE_HDCP_CONTENT_TYPE1, "HDCP Type1" }, }; DRM_ENUM_NAME_FN(drm_get_hdcp_content_type_name, drm_hdcp_content_type_enum_list) /** * drm_connector_attach_content_protection_property - attach content protection * property * * @connector: connector to attach CP property on. * @hdcp_content_type: is HDCP Content Type property needed for connector * * This is used to add support for content protection on select connectors. * Content Protection is intentionally vague to allow for different underlying * technologies, however it is most implemented by HDCP. * * When hdcp_content_type is true enum property called HDCP Content Type is * created (if it is not already) and attached to the connector. * * This property is used for sending the protected content's stream type * from userspace to kernel on selected connectors. Protected content provider * will decide their type of their content and declare the same to kernel. * * Content type will be used during the HDCP 2.2 authentication. * Content type will be set to &drm_connector_state.hdcp_content_type. * * The content protection will be set to &drm_connector_state.content_protection * * When kernel triggered content protection state change like DESIRED->ENABLED * and ENABLED->DESIRED, will use drm_hdcp_update_content_protection() to update * the content protection state of a connector. * * Returns: * Zero on success, negative errno on failure. */ int drm_connector_attach_content_protection_property( struct drm_connector *connector, bool hdcp_content_type) { struct drm_device *dev = connector->dev; struct drm_property *prop = dev->mode_config.content_protection_property; if (!prop) prop = drm_property_create_enum(dev, 0, "Content Protection", drm_cp_enum_list, ARRAY_SIZE(drm_cp_enum_list)); if (!prop) return -ENOMEM; drm_object_attach_property(&connector->base, prop, DRM_MODE_CONTENT_PROTECTION_UNDESIRED); dev->mode_config.content_protection_property = prop; if (!hdcp_content_type) return 0; prop = dev->mode_config.hdcp_content_type_property; if (!prop) prop = drm_property_create_enum(dev, 0, "HDCP Content Type", drm_hdcp_content_type_enum_list, ARRAY_SIZE( drm_hdcp_content_type_enum_list)); if (!prop) return -ENOMEM; drm_object_attach_property(&connector->base, prop, DRM_MODE_HDCP_CONTENT_TYPE0); dev->mode_config.hdcp_content_type_property = prop; return 0; } EXPORT_SYMBOL(drm_connector_attach_content_protection_property); /** * drm_hdcp_update_content_protection - Updates the content protection state * of a connector * * @connector: drm_connector on which content protection state needs an update * @val: New state of the content protection property * * This function can be used by display drivers, to update the kernel triggered * content protection state changes of a drm_connector such as DESIRED->ENABLED * and ENABLED->DESIRED. No uevent for DESIRED->UNDESIRED or ENABLED->UNDESIRED, * as userspace is triggering such state change and kernel performs it without * fail.This function update the new state of the property into the connector's * state and generate an uevent to notify the userspace. */ void drm_hdcp_update_content_protection(struct drm_connector *connector, u64 val) { struct drm_device *dev = connector->dev; struct drm_connector_state *state = connector->state; WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); if (state->content_protection == val) return; state->content_protection = val; drm_sysfs_connector_property_event(connector, dev->mode_config.content_protection_property); } EXPORT_SYMBOL(drm_hdcp_update_content_protection);
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