Re: [PATCH v10 06/40] drm/i915: MEI interface definition

[Daniel Vetter <daniel@ffwll.ch>]

On Thu, Jan 31, 2019 at 12:29:22PM +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]
> 
> Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

When you make substantial changes to a patch (like here) and decide to
keep the r-b, then please indicate that it was for an earlier version. I
most definitely didn't review this one that re-adds all the locking :-)

What's missing here is the component_del. Not exactly sure why this
doesn't blow up. Luckily we don't need a component_del_typed because
component_del already takes the (dev, ops) pair, and that's unique.
-Daniel


> ---
>  drivers/gpu/drm/i915/i915_drv.c   |   1 +
>  drivers/gpu/drm/i915/i915_drv.h   |   7 +
>  drivers/gpu/drm/i915/intel_drv.h  |   5 +
>  drivers/gpu/drm/i915/intel_hdcp.c | 378 +++++++++++++++++++++++++++++++++++++-
>  include/drm/i915_component.h      |   3 +
>  5 files changed, 393 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index a7aaa1ac4c99..75aff907ba69 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 22da9df1f0a7..d9a0771af4d1 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_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 0ac870feb5e9..63e009286d5f 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 {
> diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
> index 1a85dc46692d..e0bb5f32ba90 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 +834,348 @@ 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);
> +
> +	DRM_DEBUG("I915 HDCP comp unbind\n");
> +	mutex_lock(&dev_priv->hdcp_comp_mutex);
> +	dev_priv->hdcp_master->mei_dev = NULL;
> +	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;
> +}
> +
>  bool is_hdcp2_supported(struct drm_i915_private *dev_priv)
>  {
>  	if (!IS_ENABLED(CONFIG_INTEL_MEI_HDCP))
> @@ -845,10 +1189,42 @@ 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;
>  
>  	WARN_ON(!is_hdcp2_supported(dev_priv));
>  
> -	/* TODO: MEI interface needs to be initialized here */
> +	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) {
> +		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;
> +		}
> +	}
> +
>  	hdcp->hdcp2_supported = true;
>  }
>  
> 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
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel