Re: [PATCH v11 08/42] drm/i915: MEI interface definition

[Daniel Vetter <daniel@ffwll.ch>]

On Thu, Feb 07, 2019 at 08:40:08PM +0100, Daniel Vetter wrote:
> On Thu, Feb 07, 2019 at 02:33:57AM +0530, Ramalingam C wrote:
> > Defining the mei-i915 interface functions and initialization of
> > the interface.
> > 
> > v2:
> >   Adjust to the new interface changes. [Tomas]
> >   Added further debug logs for the failures at MEI i/f.
> >   port in hdcp_port data is equipped to handle -ve values.
> > v3:
> >   mei comp is matched for global i915 comp master. [Daniel]
> >   In hdcp_shim hdcp_protocol() is replaced with const variable. [Daniel]
> >   mei wrappers are adjusted as per the i/f change [Daniel]
> > v4:
> >   port initialization is done only at hdcp2_init only [Danvet]
> > v5:
> >   I915 registers a subcomponent to be matched with mei_hdcp [Daniel]
> > v6:
> >   HDCP_disable for all connectors incase of comp_unbind.
> >   Tear down HDCP comp interface at i915_unload [Daniel]
> > 
> > Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_drv.c        |   1 +
> >  drivers/gpu/drm/i915/i915_drv.h        |   7 +
> >  drivers/gpu/drm/i915/intel_connector.c |   2 +
> >  drivers/gpu/drm/i915/intel_drv.h       |   6 +
> >  drivers/gpu/drm/i915/intel_hdcp.c      | 423 ++++++++++++++++++++++++++++++++-
> >  include/drm/i915_component.h           |   3 +
> >  6 files changed, 441 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> > index 7de90701f6f1..9c4218b5d153 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.c
> > +++ b/drivers/gpu/drm/i915/i915_drv.c
> > @@ -904,6 +904,7 @@ static int i915_driver_init_early(struct drm_i915_private *dev_priv)
> >  	mutex_init(&dev_priv->av_mutex);
> >  	mutex_init(&dev_priv->wm.wm_mutex);
> >  	mutex_init(&dev_priv->pps_mutex);
> > +	mutex_init(&dev_priv->hdcp_comp_mutex);
> >  
> >  	i915_memcpy_init_early(dev_priv);
> >  	intel_runtime_pm_init_early(dev_priv);
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > index a2293152cb6a..e3d030b73b5b 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -55,6 +55,7 @@
> >  #include <drm/drm_util.h>
> >  #include <drm/drm_dsc.h>
> >  #include <drm/drm_connector.h>
> > +#include <drm/i915_mei_hdcp_interface.h>
> >  
> >  #include "i915_fixed.h"
> >  #include "i915_params.h"
> > @@ -2043,6 +2044,12 @@ struct drm_i915_private {
> >  
> >  	struct i915_pmu pmu;
> >  
> > +	struct i915_hdcp_comp_master *hdcp_master;
> > +	bool hdcp_comp_added;
> > +
> > +	/* Mutex to protect the above hdcp component related values. */
> > +	struct mutex hdcp_comp_mutex;
> > +
> >  	/*
> >  	 * 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_connector.c b/drivers/gpu/drm/i915/intel_connector.c
> > index ee16758747c5..66ed3ee5998a 100644
> > --- a/drivers/gpu/drm/i915/intel_connector.c
> > +++ b/drivers/gpu/drm/i915/intel_connector.c
> > @@ -88,6 +88,8 @@ void intel_connector_destroy(struct drm_connector *connector)
> >  
> >  	kfree(intel_connector->detect_edid);
> >  
> > +	intel_hdcp_cleanup(intel_connector);
> > +
> >  	if (!IS_ERR_OR_NULL(intel_connector->edid))
> >  		kfree(intel_connector->edid);
> >  
> > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > index 030d962697dd..b5c54c688256 100644
> > --- a/drivers/gpu/drm/i915/intel_drv.h
> > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > @@ -41,6 +41,7 @@
> >  #include <drm/drm_rect.h>
> >  #include <drm/drm_vblank.h>
> >  #include <drm/drm_atomic.h>
> > +#include <drm/i915_mei_hdcp_interface.h>
> >  #include <media/cec-notifier.h>
> >  
> >  struct drm_printer;
> > @@ -385,6 +386,9 @@ struct intel_hdcp_shim {
> >  	/* Detects panel's hdcp capability. This is optional for HDMI. */
> >  	int (*hdcp_capable)(struct intel_digital_port *intel_dig_port,
> >  			    bool *hdcp_capable);
> > +
> > +	/* HDCP adaptation(DP/HDMI) required on the port */
> > +	enum hdcp_wired_protocol protocol;
> >  };
> >  
> >  struct intel_hdcp {
> > @@ -405,6 +409,7 @@ struct intel_hdcp {
> >  	 * content can flow only through a link protected by HDCP2.2.
> >  	 */
> >  	u8 content_type;
> > +	struct hdcp_port_data port_data;
> >  };
> >  
> >  struct intel_connector {
> > @@ -2070,6 +2075,7 @@ int intel_hdcp_disable(struct intel_connector *connector);
> >  int intel_hdcp_check_link(struct intel_connector *connector);
> >  bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port);
> >  bool intel_hdcp_capable(struct intel_connector *connector);
> > +void intel_hdcp_cleanup(struct intel_connector *connector);
> >  
> >  /* intel_psr.c */
> >  #define CAN_PSR(dev_priv) (HAS_PSR(dev_priv) && dev_priv->psr.sink_support)
> > diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
> > index 7b1097d79fb8..79f8979b9150 100644
> > --- a/drivers/gpu/drm/i915/intel_hdcp.c
> > +++ b/drivers/gpu/drm/i915/intel_hdcp.c
> > @@ -7,8 +7,10 @@
> >   */
> >  
> >  #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"
> > @@ -832,6 +834,360 @@ 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
> > +hdcp2_prepare_ake_init(struct intel_connector *connector,
> > +		       struct hdcp2_ake_init *ake_data)
> > +{
> > +	struct hdcp_port_data *data = &connector->hdcp.port_data;
> > +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> > +	struct i915_hdcp_comp_master *comp;
> > +	int ret;
> > +
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	comp = dev_priv->hdcp_master;
> > +
> > +	if (!comp || !comp->ops) {
> > +		mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = comp->ops->initiate_hdcp2_session(comp->mei_dev, data, ake_data);
> > +	if (ret)
> > +		DRM_DEBUG_KMS("Prepare_ake_init failed. %d\n", ret);
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static __attribute__((unused)) int
> > +hdcp2_verify_rx_cert_prepare_km(struct intel_connector *connector,
> > +				struct hdcp2_ake_send_cert *rx_cert,
> > +				bool *paired,
> > +				struct hdcp2_ake_no_stored_km *ek_pub_km,
> > +				size_t *msg_sz)
> > +{
> > +	struct hdcp_port_data *data = &connector->hdcp.port_data;
> > +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> > +	struct i915_hdcp_comp_master *comp;
> > +	int ret;
> > +
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	comp = dev_priv->hdcp_master;
> > +
> > +	if (!comp || !comp->ops) {
> > +		mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = comp->ops->verify_receiver_cert_prepare_km(comp->mei_dev, data,
> > +							 rx_cert, paired,
> > +							 ek_pub_km, msg_sz);
> > +	if (ret < 0)
> > +		DRM_DEBUG_KMS("Verify rx_cert failed. %d\n", ret);
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static __attribute__((unused)) 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);
> > +	struct i915_hdcp_comp_master *comp;
> > +	int ret;
> > +
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	comp = dev_priv->hdcp_master;
> > +
> > +	if (!comp || !comp->ops) {
> > +		mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = comp->ops->verify_hprime(comp->mei_dev, data, rx_hprime);
> > +	if (ret < 0)
> > +		DRM_DEBUG_KMS("Verify hprime failed. %d\n", ret);
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static __attribute__((unused)) int
> > +hdcp2_store_pairing_info(struct intel_connector *connector,
> > +			 struct hdcp2_ake_send_pairing_info *pairing_info)
> > +{
> > +	struct hdcp_port_data *data = &connector->hdcp.port_data;
> > +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> > +	struct i915_hdcp_comp_master *comp;
> > +	int ret;
> > +
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	comp = dev_priv->hdcp_master;
> > +
> > +	if (!comp || !comp->ops) {
> > +		mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = comp->ops->store_pairing_info(comp->mei_dev, data, pairing_info);
> > +	if (ret < 0)
> > +		DRM_DEBUG_KMS("Store pairing info failed. %d\n", ret);
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static __attribute__((unused)) int
> > +hdcp2_prepare_lc_init(struct intel_connector *connector,
> > +		      struct hdcp2_lc_init *lc_init)
> > +{
> > +	struct hdcp_port_data *data = &connector->hdcp.port_data;
> > +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> > +	struct i915_hdcp_comp_master *comp;
> > +	int ret;
> > +
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	comp = dev_priv->hdcp_master;
> > +
> > +	if (!comp || !comp->ops) {
> > +		mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = comp->ops->initiate_locality_check(comp->mei_dev, data, lc_init);
> > +	if (ret < 0)
> > +		DRM_DEBUG_KMS("Prepare lc_init failed. %d\n", ret);
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static __attribute__((unused)) int
> > +hdcp2_verify_lprime(struct intel_connector *connector,
> > +		    struct hdcp2_lc_send_lprime *rx_lprime)
> > +{
> > +	struct hdcp_port_data *data = &connector->hdcp.port_data;
> > +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> > +	struct i915_hdcp_comp_master *comp;
> > +	int ret;
> > +
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	comp = dev_priv->hdcp_master;
> > +
> > +	if (!comp || !comp->ops) {
> > +		mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = comp->ops->verify_lprime(comp->mei_dev, data, rx_lprime);
> > +	if (ret < 0)
> > +		DRM_DEBUG_KMS("Verify L_Prime failed. %d\n", ret);
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static __attribute__((unused))
> > +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);
> > +	struct i915_hdcp_comp_master *comp;
> > +	int ret;
> > +
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	comp = dev_priv->hdcp_master;
> > +
> > +	if (!comp || !comp->ops) {
> > +		mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = comp->ops->get_session_key(comp->mei_dev, data, ske_data);
> > +	if (ret < 0)
> > +		DRM_DEBUG_KMS("Get session key failed. %d\n", ret);
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static __attribute__((unused)) int
> > +hdcp2_verify_rep_topology_prepare_ack(struct intel_connector *connector,
> > +				      struct hdcp2_rep_send_receiverid_list
> > +								*rep_topology,
> > +				      struct hdcp2_rep_send_ack *rep_send_ack)
> > +{
> > +	struct hdcp_port_data *data = &connector->hdcp.port_data;
> > +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> > +	struct i915_hdcp_comp_master *comp;
> > +	int ret;
> > +
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	comp = dev_priv->hdcp_master;
> > +
> > +	if (!comp || !comp->ops) {
> > +		mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = comp->ops->repeater_check_flow_prepare_ack(comp->mei_dev, data,
> > +							 rep_topology,
> > +							 rep_send_ack);
> > +	if (ret < 0)
> > +		DRM_DEBUG_KMS("Verify rep topology failed. %d\n", ret);
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static __attribute__((unused)) int
> > +hdcp2_verify_mprime(struct intel_connector *connector,
> > +		    struct hdcp2_rep_stream_ready *stream_ready)
> > +{
> > +	struct hdcp_port_data *data = &connector->hdcp.port_data;
> > +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> > +	struct i915_hdcp_comp_master *comp;
> > +	int ret;
> > +
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	comp = dev_priv->hdcp_master;
> > +
> > +	if (!comp || !comp->ops) {
> > +		mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = comp->ops->verify_mprime(comp->mei_dev, data, stream_ready);
> > +	if (ret < 0)
> > +		DRM_DEBUG_KMS("Verify mprime failed. %d\n", ret);
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static __attribute__((unused))
> > +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);
> > +	struct i915_hdcp_comp_master *comp;
> > +	int ret;
> > +
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	comp = dev_priv->hdcp_master;
> > +
> > +	if (!comp || !comp->ops) {
> > +		mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = comp->ops->enable_hdcp_authentication(comp->mei_dev, data);
> > +	if (ret < 0)
> > +		DRM_DEBUG_KMS("Enable hdcp auth failed. %d\n", ret);
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static __attribute__((unused))
> > +int hdcp2_close_mei_session(struct intel_connector *connector)
> > +{
> > +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> > +	struct i915_hdcp_comp_master *comp;
> > +	int ret;
> > +
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	comp = dev_priv->hdcp_master;
> > +
> > +	if (!comp || !comp->ops) {
> > +		mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = comp->ops->close_hdcp_session(comp->mei_dev,
> > +					     &connector->hdcp.port_data);
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static __attribute__((unused))
> > +int hdcp2_deauthenticate_port(struct intel_connector *connector)
> > +{
> > +	return hdcp2_close_mei_session(connector);
> > +}
> > +
> > +static int i915_hdcp_component_bind(struct device *i915_kdev,
> > +				    struct device *mei_kdev, void *data)
> > +{
> > +	struct drm_i915_private *dev_priv = kdev_to_i915(i915_kdev);
> > +
> > +	DRM_DEBUG("I915 HDCP comp bind\n");
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	dev_priv->hdcp_master = (struct i915_hdcp_comp_master *)data;
> > +	dev_priv->hdcp_master->mei_dev = mei_kdev;
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +
> > +	return 0;
> > +}
> > +
> > +static void i915_hdcp_component_unbind(struct device *i915_kdev,
> > +				       struct device *mei_kdev, void *data)
> > +{
> > +	struct drm_i915_private *dev_priv = kdev_to_i915(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_DEBUG("I915 HDCP comp unbind\n");
> > +
> > +	/* Once the component is unbind, Disable HDCP2.2 on all connectors */
> > +	drm_connector_list_iter_begin(dev, &conn_iter);
> > +	drm_for_each_connector_iter(connector, &conn_iter) {
> > +		intel_connector = to_intel_connector(connector);
> > +			intel_hdcp_disable(intel_connector);
> > +	}
> > +	drm_connector_list_iter_end(&conn_iter);
> 
> I played this through, and I think we have a bug here.
> 
> 1. Userspace asks for hdcp, sets connector_state->content_protection to
> DESIRED
> 2. hdcp is enabled, userspace visible value is now ENABLED
> 2. mei unloads
> 3. we disable content protection here
> 4. hdcp->value is set to UNDESIRED
> 5. intel_hdcp_prop_work does _not_ update
> connector_state->content_protection (this is correct, because otherwise
> dpms off/on would break and we would not try to restore)
> 6. Userspace still sees ENABLED, which is wrong
> 
> I think the better solution is to not call intel_hdcp_disable here at all,
> but instead wait for the link status check work to notice that ME is gone,
> which will the correctly change status from ENABLED to DESIRED.
> 
> So just the below code is needed I think
> 
> Otherwise looks good to me, with the ebove loop removed:
> 
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> 
> 
> > +
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	dev_priv->hdcp_master = NULL;
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +}
> > +
> > +static const struct component_ops i915_hdcp_component_ops = {
> > +	.bind   = i915_hdcp_component_bind,
> > +	.unbind = i915_hdcp_component_unbind,
> > +};
> > +
> > +static int initialize_hdcp_port_data(struct intel_connector *connector)
> > +{
> > +	struct intel_hdcp *hdcp = &connector->hdcp;
> > +	struct hdcp_port_data *data = &hdcp->port_data;
> > +
> > +	data->port = connector->encoder->port;
> > +	data->port_type = (u8)HDCP_PORT_TYPE_INTEGRATED;
> > +	data->protocol = (u8)hdcp->shim->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;
> > +}
> > +
> >  static bool is_hdcp2_supported(struct drm_i915_private *dev_priv)
> >  {
> >  	if (!IS_ENABLED(CONFIG_INTEL_MEI_HDCP))
> > @@ -843,9 +1199,42 @@ static bool is_hdcp2_supported(struct drm_i915_private *dev_priv)
> >  
> >  static void intel_hdcp2_init(struct intel_connector *connector)
> >  {
> > +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> >  	struct intel_hdcp *hdcp = &connector->hdcp;
> > +	bool add_component = false;
> > +	int ret;
> > +
> > +	ret = initialize_hdcp_port_data(connector);
> > +	if (ret) {
> > +		DRM_DEBUG_KMS("Mei hdcp data init failed\n");
> > +		return;
> > +	}
> > +
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	/*
> > +	 * Component for mei is common across the connector.
> > +	 * Adding the component once is sufficient.
> > +	 */
> > +	if (!dev_priv->hdcp_comp_added) {
> > +		dev_priv->hdcp_comp_added = true;
> > +		add_component = true;
> > +	}
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +
> > +	if (add_component) {

This one (and the similar code in the destroy path) is a bit awkward for
two reasons:
- Because of dp mst hotplug/unplug you need a lock to make sure we
  register only once, usually setup & teardown code doesn't need any
  locking at all because it's all single-threaded.
- ->hdcp_comp_added boils down to "have we loaded i915".

I think it would be nice to have a separate intel_hdcp_mei_comp_init/fini,
which is called only once (from mode_config setup/teardown functions
perhaps) in the driver load/unload code, which would avoid both issues.

Because the code is already protected with the mutex against the mei hdcp
driver appearing/disappearing any time it wants to this will not cause an
additional problem. So would be nice to simplify.

Cheers, Daniel

> > +		ret = component_add_typed(dev_priv->drm.dev,
> > +					  &i915_hdcp_component_ops,
> > +					  I915_COMPONENT_HDCP);
> > +		if (ret < 0) {
> > +			DRM_DEBUG_KMS("Failed at component add(%d)\n", ret);
> > +			mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +			dev_priv->hdcp_comp_added = false;
> > +			mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +			kfree(hdcp->port_data.streams);
> > +			return;
> > +		}
> > +	}
> >  
> > -	/* TODO: MEI interface needs to be initialized here */
> >  	hdcp->hdcp2_supported = true;
> >  }
> >  
> > @@ -917,6 +1306,38 @@ int intel_hdcp_disable(struct intel_connector *connector)
> >  	return ret;
> >  }
> >  
> > +void intel_hdcp_cleanup(struct intel_connector *connector)
> > +{
> > +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> > +
> > +	if (!connector->hdcp.shim)
> > +		return;
> > +
> > +	mutex_lock(&connector->hdcp.mutex);
> > +	if (!connector->hdcp.hdcp2_supported) {
> > +		mutex_unlock(&connector->hdcp.mutex);
> > +		return;
> > +	}
> > +
> > +	kfree(connector->hdcp.port_data.streams);
> > +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> > +	/*
> > +	 * Component for mei is common across the connector.
> > +	 * Removing the component once is sufficient.
> > +	 */
> > +	if (!dev_priv->hdcp_comp_added) {
> > +		mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +		mutex_unlock(&connector->hdcp.mutex);
> > +		return;
> > +	}
> > +
> > +	dev_priv->hdcp_comp_added = false;
> > +	mutex_unlock(&dev_priv->hdcp_comp_mutex);
> > +	mutex_unlock(&connector->hdcp.mutex);
> > +
> > +	component_del(dev_priv->drm.dev, &i915_hdcp_component_ops);
> > +}
> > +
> >  void intel_hdcp_atomic_check(struct drm_connector *connector,
> >  			     struct drm_connector_state *old_state,
> >  			     struct drm_connector_state *new_state)
> > diff --git a/include/drm/i915_component.h b/include/drm/i915_component.h
> > index 72fbb037f9b3..f3851ba3e4c3 100644
> > --- a/include/drm/i915_component.h
> > +++ b/include/drm/i915_component.h
> > @@ -24,10 +24,13 @@
> >  #ifndef _I915_COMPONENT_H_
> >  #define _I915_COMPONENT_H_
> >  
> > +#include <linux/device.h>
> > +
> >  #include "drm_audio_component.h"
> >  
> >  enum i915_component_type {
> >  	I915_COMPONENT_AUDIO = 1,
> > +	I915_COMPONENT_HDCP,
> >  };
> >  
> >  /* MAX_PORT is the number of port
> > -- 
> > 2.7.4
> > 
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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