linux-kernel - [PATCH v10 05/10] drm/i915/hdcp: Consolidate HDCP setup/state cache

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:   Wed, 19 Apr 2023 11:43:15 -0400
From:   Mark Yacoub <markyacoub@...omium.org>
To:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     seanpaul@...omium.org, suraj.kandpal@...el.com,
        dianders@...omium.org, dmitry.baryshkov@...aro.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org,
        Jani Nikula <jani.nikula@...el.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v10 05/10] drm/i915/hdcp: Consolidate HDCP setup/state cache

From: Sean Paul <seanpaul@...omium.org>

Stick all of the setup for HDCP into a dedicated function. No functional
change, but this will facilitate moving HDCP logic into helpers.

Acked-by: Jani Nikula <jani.nikula@...el.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@...el.com>
Signed-off-by: Sean Paul <seanpaul@...omium.org>

---
Changes in v2:
-None
Changes in v3:
-None
Changes in v4:
-None
Changes in v5:
-None
Changes in v6:
-None
Changes in v7:
- None

 drivers/gpu/drm/i915/display/intel_hdcp.c | 52 +++++++++++++++--------
 1 file changed, 35 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index 396d2cef000aa..0a20bc41be55d 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -2190,6 +2190,37 @@ static enum mei_fw_tc intel_get_mei_fw_tc(enum transcoder cpu_transcoder)
 	}
 }
 
+static int
+_intel_hdcp_setup(struct intel_connector *connector,
+		  const struct intel_crtc_state *pipe_config, u8 content_type)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
+	struct intel_hdcp *hdcp = &connector->hdcp;
+	int ret = 0;
+
+	if (!connector->encoder) {
+		drm_err(&dev_priv->drm, "[%s:%d] encoder is not initialized\n",
+			connector->base.name, connector->base.base.id);
+		return -ENODEV;
+	}
+
+	hdcp->content_type = content_type;
+
+	if (intel_crtc_has_type(pipe_config, INTEL_OUTPUT_DP_MST)) {
+		hdcp->cpu_transcoder = pipe_config->mst_master_transcoder;
+		hdcp->stream_transcoder = pipe_config->cpu_transcoder;
+	} else {
+		hdcp->cpu_transcoder = pipe_config->cpu_transcoder;
+		hdcp->stream_transcoder = INVALID_TRANSCODER;
+	}
+
+	if (DISPLAY_VER(dev_priv) >= 12)
+		dig_port->hdcp_port_data.fw_tc = intel_get_mei_fw_tc(hdcp->cpu_transcoder);
+
+	return ret;
+}
+
 static int initialize_hdcp_port_data(struct intel_connector *connector,
 				     struct intel_digital_port *dig_port,
 				     const struct intel_hdcp_shim *shim)
@@ -2329,28 +2360,14 @@ int intel_hdcp_enable(struct intel_connector *connector,
 	if (!hdcp->shim)
 		return -ENOENT;
 
-	if (!connector->encoder) {
-		drm_err(&dev_priv->drm, "[%s:%d] encoder is not initialized\n",
-			connector->base.name, connector->base.base.id);
-		return -ENODEV;
-	}
-
 	mutex_lock(&hdcp->mutex);
 	mutex_lock(&dig_port->hdcp_mutex);
 	drm_WARN_ON(&dev_priv->drm,
 		    hdcp->value == DRM_MODE_CONTENT_PROTECTION_ENABLED);
-	hdcp->content_type = content_type;
-
-	if (intel_crtc_has_type(pipe_config, INTEL_OUTPUT_DP_MST)) {
-		hdcp->cpu_transcoder = pipe_config->mst_master_transcoder;
-		hdcp->stream_transcoder = pipe_config->cpu_transcoder;
-	} else {
-		hdcp->cpu_transcoder = pipe_config->cpu_transcoder;
-		hdcp->stream_transcoder = INVALID_TRANSCODER;
-	}
 
-	if (DISPLAY_VER(dev_priv) >= 12)
-		dig_port->hdcp_port_data.fw_tc = intel_get_mei_fw_tc(hdcp->cpu_transcoder);
+	ret = _intel_hdcp_setup(connector, pipe_config, content_type);
+	if (ret)
+		goto out;
 
 	/*
 	 * Considering that HDCP2.2 is more secure than HDCP1.4, If the setup
@@ -2378,6 +2395,7 @@ int intel_hdcp_enable(struct intel_connector *connector,
 					true);
 	}
 
+out:
 	mutex_unlock(&dig_port->hdcp_mutex);
 	mutex_unlock(&hdcp->mutex);
 	return ret;
-- 
2.40.0.634.g4ca3ef3211-goog