[PATCH v6 09/35] drm/i915: Initialize HDCP2.2 and its MEI interface
Shankar, Uma
uma.shankar at intel.com
Tue Jul 31 19:41:21 UTC 2018
>-----Original Message-----
>From: C, Ramalingam
>Sent: Saturday, July 14, 2018 8:45 AM
>To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org;
>daniel at ffwll.ch; seanpaul at chromium.org; Winkler, Tomas
><tomas.winkler at intel.com>; Usyskin, Alexander <alexander.usyskin at intel.com>;
>Shankar, Uma <uma.shankar at intel.com>
>Cc: Sharma, Shashank <shashank.sharma at intel.com>; C, Ramalingam
><ramalingam.c at intel.com>
>Subject: [PATCH v6 09/35] drm/i915: Initialize HDCP2.2 and its MEI interface
>
>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]
>v6:
> HDCP2.2 uses the I915 component master to communicate with mei_hdcp
> - [Daniel]
> Required HDCP2.2 variables defined [Sean Paul]
>
>Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
>---
> drivers/gpu/drm/i915/intel_dp.c | 3 +-
> drivers/gpu/drm/i915/intel_drv.h | 23 +++++++++++-
>drivers/gpu/drm/i915/intel_hdcp.c | 77
>++++++++++++++++++++++++++++++++++++++-
> drivers/gpu/drm/i915/intel_hdmi.c | 2 +-
> include/drm/i915_component.h | 60 ++++++++++++++++++++++++++++++
> 5 files changed, 161 insertions(+), 4 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
>index 5be07e1d816d..12eb5bd33b7e 100644
>--- a/drivers/gpu/drm/i915/intel_dp.c
>+++ b/drivers/gpu/drm/i915/intel_dp.c
>@@ -6406,7 +6406,8 @@ 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 c32665136d5d..38262792813a 100644
>--- a/drivers/gpu/drm/i915/intel_drv.h
>+++ b/drivers/gpu/drm/i915/intel_drv.h
>@@ -29,6 +29,7 @@
> #include <linux/i2c.h>
> #include <linux/hdmi.h>
> #include <linux/sched/clock.h>
>+#include <linux/mei_hdcp.h>
> #include <drm/i915_drm.h>
> #include "i915_drv.h"
> #include <drm/drm_crtc.h>
>@@ -376,6 +377,9 @@ 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);
>+
>+ /* Detects the HDCP protocol(DP/HDMI) required on the port */
>+ enum hdcp_protocol (*hdcp_protocol)(void);
> };
>
> struct intel_hdcp {
>@@ -385,6 +389,20 @@ struct intel_hdcp {
> uint64_t value;
> struct delayed_work check_work;
> struct work_struct prop_work;
>+
>+ /* HDCP2.2 related definitions */
>+ /* Flag indicates whether this connector supports HDCP2.2 or not. */
>+ bool hdcp2_supported;
>+
>+ /*
>+ * Content Stream Type defined by content owner. TYPE0(0x0) content
>can
>+ * flow in the link protected by HDCP2.2 or HDCP1.4, where as
>TYPE1(0x1)
>+ * content can flow only through a link protected by HDCP2.2.
>+ */
>+ u8 content_type;
>+
>+ /* mei interface related information */
>+ struct mei_hdcp_data mei_data;
> };
>
> struct intel_connector {
>@@ -1903,11 +1921,14 @@ 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); bool
>is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port);
>+int intel_hdcp_component_init(struct drm_i915_private *dev_priv); bool
>+is_hdcp2_supported(struct drm_i915_private *dev_priv);
>
> /* 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 55bc4d423187..cfe915c3f336 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) @@ -
>744,11 +750,15 @@ 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 *shim)
>+ const struct intel_hdcp_shim *shim,
>+ bool hdcp2_supported)
> {
> struct intel_hdcp *hdcp = &connector->hdcp;
> int ret;
>
>+ if (!shim)
>+ return -EINVAL;
>+
> ret = drm_connector_attach_content_protection_property(
> &connector->base);
> if (ret)
>@@ -758,6 +768,10 @@ int intel_hdcp_init(struct intel_connector *connector,
> mutex_init(&hdcp->mutex);
> INIT_DELAYED_WORK(&hdcp->check_work, intel_hdcp_check_work);
> INIT_WORK(&hdcp->prop_work, intel_hdcp_prop_work);
>+
>+ if (hdcp2_supported)
>+ intel_hdcp2_init(connector);
>+
> return 0;
> }
>
>@@ -895,3 +909,64 @@ int intel_hdcp_check_link(struct intel_connector
>*connector)
> mutex_unlock(&hdcp->mutex);
> return ret;
> }
>+
>+static int i915_hdcp_component_match(struct device *dev, void *data) {
>+ return !strcmp(dev->driver->name, "mei_hdcp"); }
>+
>+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->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)) &&
>IS_ENABLED(CONFIG_INTEL_MEI_HDCP));
>+}
>+
>+static int intel_hdcp2_init(struct intel_connector *connector) {
The caller doesn't care for the return. Either make it void or handle the error.
I recommend later would be good.
>+ 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));
Don't think this extra check is required, since it's called only from 1 place with
hdcp2 check already taken care of. This can be dropped.
>+ ret = initialize_mei_hdcp_data(connector);
>+ if (ret)
>+ goto exit;
>+
>+ component_match_add(dev_priv->drm.dev, &dev_priv->master_match,
>+ i915_hdcp_component_match, dev_priv);
>+
>+ 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);
A comment mentioning the reason for hdcp2 supported to be false would be good.
> 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 52313bc227b2..f208a83ea2c9 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
> */
>@@ -121,6 +125,54 @@ 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_component_master - Used for communication between i915
> * and any other drivers for the services of different feature.
>@@ -131,6 +183,14 @@ struct i915_component_master {
> * 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;
>+ /**
>+ * @ops: Ops implemented by mei_hdcp driver, used by i915 driver.
>+ */
>+ const struct i915_hdcp_component_ops *hdcp_ops;
>
> /*
> * Add here the interface details between I915 and interested modules.
>--
>2.7.4
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