diff options
| -rw-r--r-- | drivers/gpu/drm/i915/intel_drv.h | 34 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_hdcp.c | 197 |
2 files changed, 216 insertions, 15 deletions
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 7fcaa3ba538c..5aa50fe34471 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -403,6 +403,22 @@ struct intel_hdcp_shim { /* Detects whether sink is HDCP2.2 capable */ int (*hdcp_2_2_capable)(struct intel_digital_port *intel_dig_port, bool *capable); + + /* Write HDCP2.2 messages */ + int (*write_2_2_msg)(struct intel_digital_port *intel_dig_port, + void *buf, size_t size); + + /* Read HDCP2.2 messages */ + int (*read_2_2_msg)(struct intel_digital_port *intel_dig_port, + u8 msg_id, void *buf, size_t size); + + /* + * Implementation of DP HDCP2.2 Errata for the communication of stream + * type to Receivers. In DP HDCP2.2 Stream type is one of the input to + * the HDCP2.2 Cipher for En/De-Cryption. Not applicable for HDMI. + */ + int (*config_stream_type)(struct intel_digital_port *intel_dig_port, + bool is_repeater, u8 type); }; struct intel_hdcp { @@ -430,6 +446,24 @@ struct intel_hdcp { */ u8 content_type; struct hdcp_port_data port_data; + + bool is_paired; + bool is_repeater; + + /* + * Count of ReceiverID_List received. Initialized to 0 at AKE_INIT. + * Incremented after processing the RepeaterAuth_Send_ReceiverID_List. + * When it rolls over re-auth has to be triggered. + */ + u32 seq_num_v; + + /* + * Count of RepeaterAuth_Stream_Manage msg propagated. + * Initialized to 0 on AKE_INIT. Incremented after every successful + * transmission of RepeaterAuth_Stream_Manage message. When it rolls + * over re-Auth has to be triggered. + */ + u32 seq_num_m; }; struct intel_connector { diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c index 0b6ccb3d24fe..d63f620581ad 100644 --- a/drivers/gpu/drm/i915/intel_hdcp.c +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -17,6 +17,7 @@ #define KEY_LOAD_TRIES 5 #define ENCRYPT_STATUS_CHANGE_TIMEOUT_MS 50 +#define HDCP2_LC_RETRY_CNT 3 static bool intel_hdcp_is_ksv_valid(u8 *ksv) @@ -862,7 +863,7 @@ bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port) return INTEL_GEN(dev_priv) >= 9 && port < PORT_E; } -static __attribute__((unused)) int +static int hdcp2_prepare_ake_init(struct intel_connector *connector, struct hdcp2_ake_init *ake_data) { @@ -887,7 +888,7 @@ hdcp2_prepare_ake_init(struct intel_connector *connector, return ret; } -static __attribute__((unused)) int +static int hdcp2_verify_rx_cert_prepare_km(struct intel_connector *connector, struct hdcp2_ake_send_cert *rx_cert, bool *paired, @@ -917,9 +918,8 @@ hdcp2_verify_rx_cert_prepare_km(struct intel_connector *connector, return ret; } -static __attribute__((unused)) int -hdcp2_verify_hprime(struct intel_connector *connector, - struct hdcp2_ake_send_hprime *rx_hprime) +static int hdcp2_verify_hprime(struct intel_connector *connector, + struct hdcp2_ake_send_hprime *rx_hprime) { struct hdcp_port_data *data = &connector->hdcp.port_data; struct drm_i915_private *dev_priv = to_i915(connector->base.dev); @@ -942,7 +942,7 @@ hdcp2_verify_hprime(struct intel_connector *connector, return ret; } -static __attribute__((unused)) int +static int hdcp2_store_pairing_info(struct intel_connector *connector, struct hdcp2_ake_send_pairing_info *pairing_info) { @@ -967,7 +967,7 @@ hdcp2_store_pairing_info(struct intel_connector *connector, return ret; } -static __attribute__((unused)) int +static int hdcp2_prepare_lc_init(struct intel_connector *connector, struct hdcp2_lc_init *lc_init) { @@ -992,7 +992,7 @@ hdcp2_prepare_lc_init(struct intel_connector *connector, return ret; } -static __attribute__((unused)) int +static int hdcp2_verify_lprime(struct intel_connector *connector, struct hdcp2_lc_send_lprime *rx_lprime) { @@ -1017,9 +1017,8 @@ hdcp2_verify_lprime(struct intel_connector *connector, return ret; } -static __attribute__((unused)) -int hdcp2_prepare_skey(struct intel_connector *connector, - struct hdcp2_ske_send_eks *ske_data) +static int hdcp2_prepare_skey(struct intel_connector *connector, + struct hdcp2_ske_send_eks *ske_data) { struct hdcp_port_data *data = &connector->hdcp.port_data; struct drm_i915_private *dev_priv = to_i915(connector->base.dev); @@ -1096,8 +1095,7 @@ hdcp2_verify_mprime(struct intel_connector *connector, return ret; } -static __attribute__((unused)) -int hdcp2_authenticate_port(struct intel_connector *connector) +static int hdcp2_authenticate_port(struct intel_connector *connector) { struct hdcp_port_data *data = &connector->hdcp.port_data; struct drm_i915_private *dev_priv = to_i915(connector->base.dev); @@ -1146,11 +1144,180 @@ static int hdcp2_deauthenticate_port(struct intel_connector *connector) return hdcp2_close_mei_session(connector); } +/* Authentication flow starts from here */ +static int hdcp2_authentication_key_exchange(struct intel_connector *connector) +{ + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + struct intel_hdcp *hdcp = &connector->hdcp; + union { + struct hdcp2_ake_init ake_init; + struct hdcp2_ake_send_cert send_cert; + struct hdcp2_ake_no_stored_km no_stored_km; + struct hdcp2_ake_send_hprime send_hprime; + struct hdcp2_ake_send_pairing_info pairing_info; + } msgs; + const struct intel_hdcp_shim *shim = hdcp->shim; + size_t size; + int ret; + + /* Init for seq_num */ + hdcp->seq_num_v = 0; + hdcp->seq_num_m = 0; + + ret = hdcp2_prepare_ake_init(connector, &msgs.ake_init); + if (ret < 0) + return ret; + + ret = shim->write_2_2_msg(intel_dig_port, &msgs.ake_init, + sizeof(msgs.ake_init)); + if (ret < 0) + return ret; + + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_AKE_SEND_CERT, + &msgs.send_cert, sizeof(msgs.send_cert)); + if (ret < 0) + return ret; + + if (msgs.send_cert.rx_caps[0] != HDCP_2_2_RX_CAPS_VERSION_VAL) + return -EINVAL; + + hdcp->is_repeater = HDCP_2_2_RX_REPEATER(msgs.send_cert.rx_caps[2]); + + /* + * Here msgs.no_stored_km will hold msgs corresponding to the km + * stored also. + */ + ret = hdcp2_verify_rx_cert_prepare_km(connector, &msgs.send_cert, + &hdcp->is_paired, + &msgs.no_stored_km, &size); + if (ret < 0) + return ret; + + ret = shim->write_2_2_msg(intel_dig_port, &msgs.no_stored_km, size); + if (ret < 0) + return ret; + + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_AKE_SEND_HPRIME, + &msgs.send_hprime, sizeof(msgs.send_hprime)); + if (ret < 0) + return ret; + + ret = hdcp2_verify_hprime(connector, &msgs.send_hprime); + if (ret < 0) + return ret; + + if (!hdcp->is_paired) { + /* Pairing is required */ + ret = shim->read_2_2_msg(intel_dig_port, + HDCP_2_2_AKE_SEND_PAIRING_INFO, + &msgs.pairing_info, + sizeof(msgs.pairing_info)); + if (ret < 0) + return ret; + + ret = hdcp2_store_pairing_info(connector, &msgs.pairing_info); + if (ret < 0) + return ret; + hdcp->is_paired = true; + } + + return 0; +} + +static int hdcp2_locality_check(struct intel_connector *connector) +{ + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + struct intel_hdcp *hdcp = &connector->hdcp; + union { + struct hdcp2_lc_init lc_init; + struct hdcp2_lc_send_lprime send_lprime; + } msgs; + const struct intel_hdcp_shim *shim = hdcp->shim; + int tries = HDCP2_LC_RETRY_CNT, ret, i; + + for (i = 0; i < tries; i++) { + ret = hdcp2_prepare_lc_init(connector, &msgs.lc_init); + if (ret < 0) + continue; + + ret = shim->write_2_2_msg(intel_dig_port, &msgs.lc_init, + sizeof(msgs.lc_init)); + if (ret < 0) + continue; + + ret = shim->read_2_2_msg(intel_dig_port, + HDCP_2_2_LC_SEND_LPRIME, + &msgs.send_lprime, + sizeof(msgs.send_lprime)); + if (ret < 0) + continue; + + ret = hdcp2_verify_lprime(connector, &msgs.send_lprime); + if (!ret) + break; + } + + return ret; +} + +static int hdcp2_session_key_exchange(struct intel_connector *connector) +{ + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + struct intel_hdcp *hdcp = &connector->hdcp; + struct hdcp2_ske_send_eks send_eks; + int ret; + + ret = hdcp2_prepare_skey(connector, &send_eks); + if (ret < 0) + return ret; + + ret = hdcp->shim->write_2_2_msg(intel_dig_port, &send_eks, + sizeof(send_eks)); + if (ret < 0) + return ret; + + return 0; +} + static int hdcp2_authenticate_sink(struct intel_connector *connector) { - DRM_ERROR("Sink authentication is done in subsequent patches\n"); + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + struct intel_hdcp *hdcp = &connector->hdcp; + const struct intel_hdcp_shim *shim = hdcp->shim; + int ret; - return -EINVAL; + ret = hdcp2_authentication_key_exchange(connector); + if (ret < 0) { + DRM_DEBUG_KMS("AKE Failed. Err : %d\n", ret); + return ret; + } + + ret = hdcp2_locality_check(connector); + if (ret < 0) { + DRM_DEBUG_KMS("Locality Check failed. Err : %d\n", ret); + return ret; + } + + ret = hdcp2_session_key_exchange(connector); + if (ret < 0) { + DRM_DEBUG_KMS("SKE Failed. Err : %d\n", ret); + return ret; + } + + if (shim->config_stream_type) { + ret = shim->config_stream_type(intel_dig_port, + hdcp->is_repeater, + hdcp->content_type); + if (ret < 0) + return ret; + } + + hdcp->port_data.streams[0].stream_type = hdcp->content_type; + ret = hdcp2_authenticate_port(connector); + if (ret < 0) + return ret; + + return ret; } static int hdcp2_enable_encryption(struct intel_connector *connector) |