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

["C, Ramalingam" <ramalingam.c@xxxxxxxxx>]

On 1/31/2019 1:47 PM, Daniel Vetter wrote:
> 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@xxxxxxxxx>
> > Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> 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 :-)
sure :)
> What's missing here is the component_del. Not exactly sure why this
> doesn't blow up.
That is weird. But yes note the absence of _del. I will introduce the 
the call to hdcp_exit at unload and handle the component_del.
> Luckily we don't need a component_del_typed because
> component_del already takes the (dev, ops) pair, and that's unique.
yes true.

-Ram
> -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

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