[PATCH v5 08/40] drm/i915: Initialize HDCP2.2 and its MEI interface
Ramalingam C
ramalingam.c at intel.com
Wed Jun 27 08:39:57 UTC 2018
Initialize HDCP2.2 support. This includes the mei interface
initialization along with required component registration.
v2:
mei interface handle is protected with mutex. [Chris Wilson]
v3:
Notifiers are used for the mei interface state.
v4:
Poll for mei client device state
Error msg for out of mem [Uma]
Inline req for init function removed [Uma]
v5:
Rebase as Part of reordering.
Component is used for the I915 and MEI_HDCP interface [Daniel]
Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 2 +
drivers/gpu/drm/i915/intel_dp.c | 3 +-
drivers/gpu/drm/i915/intel_drv.h | 5 +-
drivers/gpu/drm/i915/intel_hdcp.c | 204 +++++++++++++++++++++++++++++++++++++-
drivers/gpu/drm/i915/intel_hdmi.c | 2 +-
include/drm/i915_component.h | 88 ++++++++++++++++
6 files changed, 298 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 6f08ab310118..0e6fe140dc63 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2142,6 +2142,8 @@ struct drm_i915_private {
struct i915_pmu pmu;
+ struct i915_hdcp_component *hdcp_comp;
+
/*
* NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch
* will be rejected. Instead look for a better place.
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index c1b2f00f324b..6bcc52766ea3 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -6404,7 +6404,8 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
intel_dp_add_properties(intel_dp, connector);
if (is_hdcp_supported(dev_priv, port) && !intel_dp_is_edp(intel_dp)) {
- int ret = intel_hdcp_init(intel_connector, &intel_dp_hdcp_shim);
+ int ret = intel_hdcp_init(intel_connector, &intel_dp_hdcp_shim,
+ false);
if (ret)
DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
}
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index b615ea4a44c3..2eeb82b04953 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -441,9 +441,7 @@ struct intel_hdcp {
uint32_t seq_num_m;
/* mei interface related information */
- struct mei_cl_device *cldev;
struct mei_hdcp_data mei_data;
-
struct delayed_work hdcp2_check_work;
};
@@ -1962,7 +1960,8 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
struct drm_connector_state *old_state,
struct drm_connector_state *new_state);
int intel_hdcp_init(struct intel_connector *connector,
- const struct intel_hdcp_shim *hdcp_shim);
+ const struct intel_hdcp_shim *hdcp_shim,
+ bool hdcp2_supported);
int intel_hdcp_enable(struct intel_connector *connector);
int intel_hdcp_disable(struct intel_connector *connector);
int intel_hdcp_check_link(struct intel_connector *connector);
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 65bbe5874eee..769560591aa8 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -8,13 +8,19 @@
#include <drm/drmP.h>
#include <drm/drm_hdcp.h>
+#include <drm/i915_component.h>
#include <linux/i2c.h>
#include <linux/random.h>
+#include <linux/component.h>
#include "intel_drv.h"
#include "i915_reg.h"
#define KEY_LOAD_TRIES 5
+#define GET_MEI_DDI_INDEX(port) (((port) == PORT_A) ? DDI_A : \
+ (enum hdcp_physical_port)(port))
+
+static int intel_hdcp2_init(struct intel_connector *connector);
static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port,
const struct intel_hdcp_shim *shim)
@@ -743,11 +749,15 @@ bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port)
}
int intel_hdcp_init(struct intel_connector *connector,
- const struct intel_hdcp_shim *hdcp_shim)
+ const struct intel_hdcp_shim *hdcp_shim,
+ bool hdcp2_supported)
{
struct intel_hdcp *hdcp = &connector->hdcp;
int ret;
+ if (!hdcp_shim)
+ return -EINVAL;
+
ret = drm_connector_attach_content_protection_property(
&connector->base);
if (ret)
@@ -757,6 +767,10 @@ int intel_hdcp_init(struct intel_connector *connector,
mutex_init(&hdcp->hdcp_mutex);
INIT_DELAYED_WORK(&hdcp->hdcp_check_work, intel_hdcp_check_work);
INIT_WORK(&hdcp->hdcp_prop_work, intel_hdcp_prop_work);
+
+ if (hdcp2_supported)
+ intel_hdcp2_init(connector);
+
return 0;
}
@@ -896,3 +910,191 @@ int intel_hdcp_check_link(struct intel_connector *connector)
mutex_unlock(&hdcp->hdcp_mutex);
return ret;
}
+
+static int i915_hdcp_component_master_bind(struct device *dev)
+{
+ struct drm_i915_private *dev_priv = kdev_to_i915(dev);
+ struct i915_hdcp_component *comp = dev_priv->hdcp_comp;
+ int ret;
+
+ mutex_lock(&comp->mutex);
+ ret = component_bind_all(dev, comp);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Atm, we don't support dynamic unbinding initiated by the child
+ * component, so pin its containing module until we unbind.
+ */
+ if (!try_module_get(comp->ops->owner)) {
+ ret = -ENODEV;
+ goto out_unbind;
+ }
+
+ mutex_unlock(&comp->mutex);
+ return 0;
+
+out_unbind:
+ component_unbind_all(dev, comp);
+ mutex_unlock(&comp->mutex);
+
+ return ret;
+}
+
+static void i915_hdcp_component_master_unbind(struct device *dev)
+{
+ struct drm_i915_private *dev_priv = kdev_to_i915(dev);
+ struct i915_hdcp_component *comp = dev_priv->hdcp_comp;
+
+ mutex_lock(&comp->mutex);
+ module_put(comp->ops->owner);
+ component_unbind_all(dev, comp);
+ WARN_ON(comp->ops);
+ mutex_unlock(&comp->mutex);
+}
+
+static const struct component_master_ops i915_hdcp_component_master_ops = {
+ .bind = i915_hdcp_component_master_bind,
+ .unbind = i915_hdcp_component_master_unbind,
+};
+
+static void intel_hdcp_component_cleanup(struct drm_i915_private *dev_priv)
+{
+ component_master_del(dev_priv->drm.dev,
+ &i915_hdcp_component_master_ops);
+ kfree(dev_priv->hdcp_comp);
+}
+
+static void intel_hdcp2_exit(struct intel_connector *connector)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+ /* TO-DO: Disable the HDCP here */
+ kfree(connector->hdcp.mei_data.streams);
+
+ if (dev_priv->hdcp_comp)
+ intel_hdcp_component_cleanup(dev_priv);
+}
+
+static void intel_pull_down_mei_interface(struct device *kdev)
+{
+ struct drm_i915_private *dev_priv = kdev_to_i915(kdev);
+ struct drm_device *dev = &dev_priv->drm;
+ struct intel_connector *intel_connector;
+ struct drm_connector *connector;
+ struct drm_connector_list_iter conn_iter;
+
+ DRM_INFO("MEI Device is Down");
+ drm_connector_list_iter_begin(dev, &conn_iter);
+ drm_for_each_connector_iter(connector, &conn_iter) {
+ intel_connector = to_intel_connector(connector);
+ if (!intel_connector->hdcp.hdcp2_supported)
+ continue;
+
+ intel_hdcp2_exit(intel_connector);
+ }
+ drm_connector_list_iter_end(&conn_iter);
+}
+
+struct i915_hdcp_component_master_ops master_ops = {
+ .pull_down_interface = intel_pull_down_mei_interface,
+};
+
+static int i915_hdcp_component_master_match(struct device *dev, void *data)
+{
+ return !strcmp(dev->driver->name, "mei_hdcp");
+}
+
+static int intel_hdcp_component_init(struct intel_connector *connector)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct i915_hdcp_component *comp;
+ struct component_match *match = NULL;
+ int ret;
+
+ comp = kzalloc(sizeof(*comp), GFP_KERNEL);
+ if (!comp)
+ return -ENOMEM;
+
+ mutex_init(&comp->mutex);
+ comp->master_ops = &master_ops;
+ dev_priv->hdcp_comp = comp;
+
+ component_match_add(dev_priv->drm.dev, &match,
+ i915_hdcp_component_master_match, dev_priv);
+ ret = component_master_add_with_match(dev_priv->drm.dev,
+ &i915_hdcp_component_master_ops,
+ match);
+ if (ret < 0)
+ goto out_err;
+
+ DRM_INFO("I915 hdcp component master added.\n");
+ return ret;
+
+out_err:
+ component_master_del(dev_priv->drm.dev,
+ &i915_hdcp_component_master_ops);
+ kfree(comp);
+ dev_priv->hdcp_comp = NULL;
+ DRM_ERROR("Failed to add i915 hdcp component master (%d)\n", ret);
+
+ return ret;
+}
+
+static int initialize_mei_hdcp_data(struct intel_connector *connector)
+{
+ struct intel_hdcp *hdcp = &connector->hdcp;
+ struct mei_hdcp_data *data = &hdcp->mei_data;
+ enum port port;
+
+ if (connector->encoder) {
+ port = connector->encoder->port;
+ data->port = GET_MEI_DDI_INDEX(port);
+ }
+
+ data->port_type = INTEGRATED;
+ data->protocol = hdcp->hdcp_shim->hdcp_protocol();
+
+ data->k = 1;
+ if (!data->streams)
+ data->streams = kcalloc(data->k,
+ sizeof(struct hdcp2_streamid_type),
+ GFP_KERNEL);
+ if (!data->streams) {
+ DRM_ERROR("Out of Memory\n");
+ return -ENOMEM;
+ }
+
+ data->streams[0].stream_id = 0;
+ data->streams[0].stream_type = hdcp->content_type;
+
+ return 0;
+}
+
+bool is_hdcp2_supported(struct drm_i915_private *dev_priv)
+{
+ return (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv) ||
+ IS_KABYLAKE(dev_priv));
+}
+
+static int intel_hdcp2_init(struct intel_connector *connector)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_hdcp *hdcp = &connector->hdcp;
+ int ret;
+
+ WARN_ON(!is_hdcp2_supported(dev_priv));
+ ret = initialize_mei_hdcp_data(connector);
+ if (ret)
+ goto exit;
+
+ if (!dev_priv->hdcp_comp)
+ ret = intel_hdcp_component_init(connector);
+
+ if (ret)
+ kfree(hdcp->mei_data.streams);
+ hdcp->hdcp2_supported = true;
+
+exit:
+ return ret;
+}
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 8363fbd18ee8..7988f958d835 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -2366,7 +2366,7 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
if (is_hdcp_supported(dev_priv, port)) {
int ret = intel_hdcp_init(intel_connector,
- &intel_hdmi_hdcp_shim);
+ &intel_hdmi_hdcp_shim, false);
if (ret)
DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
}
diff --git a/include/drm/i915_component.h b/include/drm/i915_component.h
index 346b1f5cb180..9986174ee090 100644
--- a/include/drm/i915_component.h
+++ b/include/drm/i915_component.h
@@ -24,6 +24,10 @@
#ifndef _I915_COMPONENT_H_
#define _I915_COMPONENT_H_
+#include <linux/mei_cl_bus.h>
+#include <linux/mei_hdcp.h>
+#include <drm/drm_hdcp.h>
+
/* MAX_PORT is the number of port
* It must be sync with I915_MAX_PORTS defined i915_drv.h
*/
@@ -121,4 +125,88 @@ struct i915_audio_component {
const struct i915_audio_component_audio_ops *audio_ops;
};
+struct i915_hdcp_component_ops {
+ /**
+ * @owner: mei_hdcp module
+ */
+ struct module *owner;
+ int (*initiate_hdcp2_session)(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data,
+ struct hdcp2_ake_init *ake_data);
+ int
+ (*verify_receiver_cert_prepare_km)(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data,
+ struct hdcp2_ake_send_cert *rx_cert,
+ bool *km_stored,
+ struct hdcp2_ake_no_stored_km
+ *ek_pub_km,
+ size_t *msg_sz);
+ int (*verify_hprime)(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data,
+ struct hdcp2_ake_send_hprime *rx_hprime);
+ int (*store_pairing_info)(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data,
+ struct hdcp2_ake_send_pairing_info
+ *pairing_info);
+ int (*initiate_locality_check)(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data,
+ struct hdcp2_lc_init *lc_init_data);
+ int (*verify_lprime)(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data,
+ struct hdcp2_lc_send_lprime *rx_lprime);
+ int (*get_session_key)(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data,
+ struct hdcp2_ske_send_eks *ske_data);
+ int
+ (*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);
+ int (*verify_mprime)(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data,
+ struct hdcp2_rep_stream_ready *stream_ready);
+ int (*enable_hdcp_authentication)(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data);
+ int (*close_hdcp_session)(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data);
+};
+
+struct i915_hdcp_component_master_ops {
+ void (*pull_down_interface)(struct device *dev);
+};
+
+/**
+ * struct i915_mei_hdcp_component - Used for direct communication between i915
+ * and mei_hdcp drivers
+ */
+struct i915_hdcp_component {
+ /**
+ * @dev: Kdev of Slave Component. Passed to bind calls.
+ */
+ struct device *dev;
+ /**
+ * @i915_kdev: Kdev of I915. Used from the client component for
+ * removing the reference to mei_cldev.
+ */
+ struct device *i915_kdev;
+ /**
+ * @mei_cldev: mei client device, used as parameter for ops
+ */
+ struct mei_cl_device *mei_cldev;
+ /**
+ * @mutex: Mutex to protect the state of mei_cldev
+ */
+ struct mutex mutex;
+ /**
+ * @ops: Ops implemented by mei_hdcp driver, used by i915 driver.
+ */
+ const struct i915_hdcp_component_ops *ops;
+ /**
+ * @master_ops: Ops implemented by I915 driver, used by mei_hdcp driver.
+ */
+ const struct i915_hdcp_component_master_ops *master_ops;
+};
+
#endif /* _I915_COMPONENT_H_ */
--
2.7.4
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