On Mon, Jul 09, 2018 at 07:01:09PM +0530, Ramalingam C wrote:
> 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:
> I915 registration is moved into hdcp component bind [Daniel]
>
> Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.c | 33 +++++--
> drivers/gpu/drm/i915/i915_drv.h | 3 +
> drivers/gpu/drm/i915/intel_dp.c | 3 +-
> drivers/gpu/drm/i915/intel_drv.h | 6 +-
> drivers/gpu/drm/i915/intel_hdcp.c | 193 +++++++++++++++++++++++++++++++++++++-
> drivers/gpu/drm/i915/intel_hdmi.c | 2 +-
> include/drm/i915_component.h | 88 +++++++++++++++++
> 7 files changed, 314 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 0db3c83cce29..e6dc0f409a6e 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1310,6 +1310,19 @@ static void i915_welcome_messages(struct drm_i915_private *dev_priv)
> DRM_INFO("DRM_I915_DEBUG_GEM enabled\n");
> }
>
> +void i915_driver_load_tail(struct drm_i915_private *dev_priv)
> +{
This isn't quite enough, we also must delay anything that might do a
modeset. For almost everything this happens when we call
i915_driver_register, but the fbdev emulation gets set up before that. We
need to also include that (and everything after that point) in the
load_tail function here.
> + i915_driver_register(dev_priv);
> +
> + intel_runtime_pm_enable(dev_priv);
> +
> + intel_init_ipc(dev_priv);
> +
> + intel_runtime_pm_put(dev_priv);
> +
> + i915_welcome_messages(dev_priv);
> +}
> +
> /**
> * i915_driver_load - setup chip and create an initial config
> * @pdev: PCI device
> @@ -1389,16 +1402,18 @@ int i915_driver_load(struct pci_dev *pdev, const struct pci_device_id *ent)
> if (ret < 0)
> goto out_cleanup_hw;
>
> - i915_driver_register(dev_priv);
> -
> - intel_runtime_pm_enable(dev_priv);
> -
> - intel_init_ipc(dev_priv);
> -
> - intel_runtime_pm_put(dev_priv);
> -
> - i915_welcome_messages(dev_priv);
> + if (is_hdcp2_supported(dev_priv)) {
> + ret = intel_hdcp_component_init(dev_priv);
> + if (ret) {
> + DRM_DEV_ERROR(&pdev->dev, "HDCP comp init failed %d\n",
> + ret);
> + goto out_cleanup_hw;
> + }
> + DRM_DEV_INFO(&pdev->dev, "I915 waits for MEI HDCP bind.\n");
> + return 0;
> + }
>
> + i915_driver_load_tail(dev_priv);
Yup, this is roughly what I had in mind. The only slightly annoying thing
is that this sprinkles is_hdcp2_supported() checks all over the codebase.
What I had in mind instead to have slightly more polished code, and make
this componentn business more useful in general for us:
- Put the component master into i915_dev_priv instead of hiding it in the
hdcp structure.
- Create a 2nd component that fires when driver loading is complete (i.e.
right here). This can be a really dumb one with nothing as callbacks.
- Put the driver_load_tail call unconditionally into the master_bind, and
put the component_master_add_with_match() call also here.
- Don't move the hdcp init around since that's no longer necessary.
> return 0;
>
> out_cleanup_hw:
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 09ab12458244..febb8c8dc457 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2119,6 +2119,8 @@ struct drm_i915_private {
>
> struct i915_pmu pmu;
>
> + struct i915_hdcp_component *hdcp_comp;
> +
> /*
> * NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch
> * will be rejected. Instead look for a better place.
> @@ -2732,6 +2734,7 @@ int intel_engines_init_mmio(struct drm_i915_private *dev_priv);
> int intel_engines_init(struct drm_i915_private *dev_priv);
>
> u32 intel_calculate_mcr_s_ss_select(struct drm_i915_private *dev_priv);
> +void i915_driver_load_tail(struct drm_i915_private *dev_priv);
>
> /* intel_hotplug.c */
> void intel_hpd_irq_handler(struct drm_i915_private *dev_priv,
> 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 5799788c8f5d..c40c8283bf79 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -443,7 +443,6 @@ struct intel_hdcp {
>
> /* mei interface related information */
> struct mei_hdcp_data mei_data;
> -
> struct delayed_work hdcp2_check_work;
> };
>
> @@ -1963,11 +1962,14 @@ 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 65bbe5874eee..928fcd214cf0 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)
> @@ -743,11 +749,15 @@ 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 *hdcp_shim)
> + const struct intel_hdcp_shim *hdcp_shim,
> + bool hdcp2_supported)
> {
> struct intel_hdcp *hdcp = &connector->hdcp;
> int ret;
>
> + if (!hdcp_shim)
> + return -EINVAL;
> +
> ret = drm_connector_attach_content_protection_property(
> &connector->base);
> if (ret)
> @@ -757,6 +767,10 @@ int intel_hdcp_init(struct intel_connector *connector,
> mutex_init(&hdcp->hdcp_mutex);
> INIT_DELAYED_WORK(&hdcp->hdcp_check_work, intel_hdcp_check_work);
> INIT_WORK(&hdcp->hdcp_prop_work, intel_hdcp_prop_work);
> +
> + if (hdcp2_supported)
> + intel_hdcp2_init(connector);
> +
> return 0;
> }
>
> @@ -896,3 +910,180 @@ int intel_hdcp_check_link(struct intel_connector *connector)
> mutex_unlock(&hdcp->hdcp_mutex);
> return ret;
> }
> +
> +static int i915_hdcp_component_master_bind(struct device *dev)
> +{
> + struct drm_i915_private *dev_priv = kdev_to_i915(dev);
> + struct i915_hdcp_component *comp = dev_priv->hdcp_comp;
> + static bool i915_loaded;
> + int ret;
> +
> + mutex_lock(&comp->mutex);
> + ret = component_bind_all(dev, comp);
> + if (ret < 0) {
> + mutex_unlock(&comp->mutex);
> + return ret;
> + }
> +
> + if (!i915_loaded)
I have no idea why you need this one here ...
> + i915_driver_load_tail(dev_priv);
> +
> + mutex_unlock(&comp->mutex);
Also not clear on the need for locking here? I thought component takes
care of that for you.
> + return 0;
> +}
> +
> +static void i915_hdcp_component_master_unbind(struct device *dev)
> +{
> + struct drm_i915_private *dev_priv = kdev_to_i915(dev);
> + struct i915_hdcp_component *comp = dev_priv->hdcp_comp;
> +
> + mutex_lock(&comp->mutex);
Same here.
Cheers, Daniel
> + component_unbind_all(dev, comp);
> + WARN_ON(comp->ops);
> + mutex_unlock(&comp->mutex);
> +}
> +
> +static const struct component_master_ops i915_hdcp_component_master_ops = {
> + .bind = i915_hdcp_component_master_bind,
> + .unbind = i915_hdcp_component_master_unbind,
> +};
> +
> +static void intel_hdcp_component_cleanup(struct drm_i915_private *dev_priv)
> +{
> + component_master_del(dev_priv->drm.dev,
> + &i915_hdcp_component_master_ops);
> + kfree(dev_priv->hdcp_comp);
> +}
> +
> +static void intel_hdcp2_exit(struct intel_connector *connector)
> +{
> + struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> +
> + /* TO-DO: Disable the HDCP here */
> + kfree(connector->hdcp.mei_data.streams);
> +
> + if (dev_priv->hdcp_comp)
> + intel_hdcp_component_cleanup(dev_priv);
> +}
> +
> +static void intel_pull_down_mei_interface(struct device *kdev)
> +{
> + struct drm_i915_private *dev_priv = kdev_to_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_INFO("MEI Device is Down");
> + drm_connector_list_iter_begin(dev, &conn_iter);
> + drm_for_each_connector_iter(connector, &conn_iter) {
> + intel_connector = to_intel_connector(connector);
> + if (!intel_connector->hdcp.hdcp2_supported)
> + continue;
> +
> + intel_hdcp2_exit(intel_connector);
> + }
> + drm_connector_list_iter_end(&conn_iter);
> +}
> +
> +struct i915_hdcp_component_master_ops master_ops = {
> + .pull_down_interface = intel_pull_down_mei_interface,
> +};
> +
> +static int i915_hdcp_component_master_match(struct device *dev, void *data)
> +{
> + return !strcmp(dev->driver->name, "mei_hdcp");
> +}
> +
> +int intel_hdcp_component_init(struct drm_i915_private *dev_priv)
> +{
> + struct i915_hdcp_component *comp;
> + struct component_match *match = NULL;
> + int ret;
> +
> + if (dev_priv->hdcp_comp)
> + return -EINVAL;
> +
> + comp = kzalloc(sizeof(*comp), GFP_KERNEL);
> + if (!comp)
> + return -ENOMEM;
> +
> + mutex_init(&comp->mutex);
> + comp->master_ops = &master_ops;
> + dev_priv->hdcp_comp = comp;
> +
> + component_match_add(dev_priv->drm.dev, &match,
> + i915_hdcp_component_master_match, dev_priv);
> + ret = component_master_add_with_match(dev_priv->drm.dev,
> + &i915_hdcp_component_master_ops,
> + match);
> + if (ret < 0)
> + goto out_err;
> +
> + DRM_INFO("I915 hdcp component master added.\n");
> + return ret;
> +
> +out_err:
> + component_master_del(dev_priv->drm.dev,
> + &i915_hdcp_component_master_ops);
> + kfree(comp);
> + dev_priv->hdcp_comp = NULL;
> + DRM_ERROR("Failed to add i915 hdcp component master (%d)\n", ret);
> +
> + return ret;
> +}
> +
> +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->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)
> +{
> + 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));
> + ret = initialize_mei_hdcp_data(connector);
> + if (ret)
> + goto exit;
> +
> + if (ret)
> + kfree(hdcp->mei_data.streams);
> + 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);
> 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 346b1f5cb180..9986174ee090 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
> */
> @@ -121,4 +125,88 @@ 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_hdcp_component_master_ops {
> + void (*pull_down_interface)(struct device *dev);
> +};
> +
> +/**
> + * struct i915_mei_hdcp_component - Used for direct communication between i915
> + * and mei_hdcp drivers
> + */
> +struct i915_hdcp_component {
> + /**
> + * @dev: Kdev of Slave Component. Passed to bind calls.
> + */
> + struct device *dev;
> + /**
> + * @i915_kdev: Kdev of I915. Used from the client component for
> + * 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;
> + /**
> + * @mutex: Mutex to protect the state of mei_cldev
> + */
> + struct mutex mutex;
> + /**
> + * @ops: Ops implemented by mei_hdcp driver, used by i915 driver.
> + */
> + const struct i915_hdcp_component_ops *ops;
> + /**
> + * @master_ops: Ops implemented by I915 driver, used by mei_hdcp driver.
> + */
> + const struct i915_hdcp_component_master_ops *master_ops;
> +};
> +
> #endif /* _I915_COMPONENT_H_ */
> --
> 2.7.4
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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