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

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