[PATCH v6 32/35] misc/mei/hdcp: Repeater topology verification and ack

[Shankar, Uma]

>-----Original Message-----
>From: C, Ramalingam
>Sent: Saturday, July 14, 2018 8:45 AM
>To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org;
>daniel at ffwll.ch; seanpaul at chromium.org; Winkler, Tomas
><tomas.winkler at intel.com>; Usyskin, Alexander <alexander.usyskin at intel.com>;
>Shankar, Uma <uma.shankar at intel.com>
>Cc: Sharma, Shashank <shashank.sharma at intel.com>; C, Ramalingam
><ramalingam.c at intel.com>
>Subject: [PATCH v6 32/35] misc/mei/hdcp: Repeater topology verification and
>ack
>
>Request ME to verify the downstream topology information received.
>
>ME FW will validate the Repeaters receiver id list and downstream topology.
>
>On Success ME FW will provide the Least Significant 128bits of VPrime, which
>forms the repeater ack.
>
>v2:
>  Rebased.
>v3:
>  cldev is passed as first parameter [Tomas]
>  Redundant comments and cast are removed [Tomas]
>v4:
>  %zd for ssize_t [Alexander]
>  %s/return -1/return -EIO [Alexander]
>  Style and typos fixed [Uma]
>v5:
>  Rebased.
>v6:
>  No change.
>

Looks ok to me.
Reviewed-by: Uma Shankar <uma.shankar at intel.com>

>Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
>---
> drivers/misc/mei/hdcp/mei_hdcp.c | 77
>+++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 76 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>b/drivers/misc/mei/hdcp/mei_hdcp.c
>index eb35e22fdeff..be220f8a6393 100644
>--- a/drivers/misc/mei/hdcp/mei_hdcp.c
>+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>@@ -482,6 +482,80 @@ static int mei_get_session_key(struct mei_cl_device
>*cldev,
> 	return 0;
> }
>
>+/*
>+ * mei_repeater_check_flow_prepare_ack:
>+ *	Function to validate the Downstream topology and prepare rep_ack.
>+ *
>+ * cldev		: Pointer for mei client device
>+ * data			: Intel HW specific Data
>+ * rep_topology		: Pointer for Receiver Id List to be validated.
>+ * rep_send_ack		: Pointer for repeater ack
>+ *
>+ * Returns 0 on Success, <0 on Failure
>+ */
>+static int
>+mei_repeater_check_flow_prepare_ack(struct mei_cl_device *cldev,
>+				    struct mei_hdcp_data *data,
>+				    struct hdcp2_rep_send_receiverid_list
>+							*rep_topology,
>+				    struct hdcp2_rep_send_ack *rep_send_ack) {
>+	struct wired_cmd_verify_repeater_in verify_repeater_in = { { 0 } };
>+	struct wired_cmd_verify_repeater_out verify_repeater_out = { { 0 } };
>+	struct device *dev;
>+	ssize_t byte;
>+
>+	if (!rep_topology || !rep_send_ack || !data)
>+		return -EINVAL;
>+
>+	dev = &cldev->dev;
>+
>+	verify_repeater_in.header.api_version = HDCP_API_VERSION;
>+	verify_repeater_in.header.command_id = WIRED_VERIFY_REPEATER;
>+	verify_repeater_in.header.status = ME_HDCP_STATUS_SUCCESS;
>+	verify_repeater_in.header.buffer_len =
>+
>	WIRED_CMD_BUF_LEN_VERIFY_REPEATER_IN;
>+
>+	verify_repeater_in.port.integrated_port_type = data->port_type;
>+	verify_repeater_in.port.physical_port = data->port;
>+
>+	memcpy(verify_repeater_in.rx_info, rep_topology->rx_info,
>+	       HDCP_2_2_RXINFO_LEN);
>+	memcpy(verify_repeater_in.seq_num_v, rep_topology->seq_num_v,
>+	       HDCP_2_2_SEQ_NUM_LEN);
>+	memcpy(verify_repeater_in.v_prime, rep_topology->v_prime,
>+	       HDCP_2_2_LPRIME_HALF_LEN);
>+	memcpy(verify_repeater_in.receiver_ids, rep_topology->receiver_ids,
>+	       HDCP_2_2_RECEIVER_IDS_MAX_LEN);
>+
>+	byte = mei_cldev_send(cldev, (u8 *)&verify_repeater_in,
>+			      sizeof(verify_repeater_in));
>+	if (byte < 0) {
>+		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
>+		return byte;
>+	}
>+
>+	byte = mei_cldev_recv(cldev, (u8 *)&verify_repeater_out,
>+			      sizeof(verify_repeater_out));
>+	if (byte < 0) {
>+		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
>+		return byte;
>+	}
>+
>+	if (verify_repeater_out.header.status != ME_HDCP_STATUS_SUCCESS) {
>+		dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
>+			WIRED_VERIFY_REPEATER,
>+			verify_repeater_out.header.status);
>+		return -EIO;
>+	}
>+
>+	memcpy(rep_send_ack->v, verify_repeater_out.v,
>+	       HDCP_2_2_LPRIME_HALF_LEN);
>+	rep_send_ack->msg_id = HDCP_2_2_REP_SEND_ACK;
>+
>+	return 0;
>+}
>+
> struct i915_hdcp_component_ops mei_hdcp_component_ops = {
> 	.owner					= THIS_MODULE,
> 	.initiate_hdcp2_session			= mei_initiate_hdcp2_session,
>@@ -492,7 +566,8 @@ struct i915_hdcp_component_ops
>mei_hdcp_component_ops = {
> 	.initiate_locality_check		= mei_initiate_locality_check,
> 	.verify_lprime				= mei_verify_lprime,
> 	.get_session_key			= mei_get_session_key,
>-	.repeater_check_flow_prepare_ack	= NULL,
>+	.repeater_check_flow_prepare_ack	=
>+
>	mei_repeater_check_flow_prepare_ack,
> 	.verify_mprime				= NULL,
> 	.enable_hdcp_authentication		= NULL,
> 	.close_hdcp_session			= NULL,
>--
>2.7.4