Re: [PATCH v10 36/40] misc/mei/hdcp: Component framework for I915 Interface

["Shankar, Uma" <uma.shankar@intel.com>]

>-----Original Message-----
>From: C, Ramalingam
>Sent: Thursday, January 31, 2019 12:30 PM
>To: intel-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org;
>daniel.vetter@ffwll.ch; Winkler, Tomas <tomas.winkler@intel.com>; Shankar,
>Uma <uma.shankar@intel.com>
>Cc: C, Ramalingam <ramalingam.c@intel.com>
>Subject: [PATCH v10 36/40] misc/mei/hdcp: Component framework for I915
>Interface
>
>Mei hdcp driver is designed as component slave for the I915 component master.
>
>v2: Rebased.
>v3:
>  Notifier chain is adopted for cldev state update [Tomas]
>v4:
>  Made static dummy functions as inline in mei_hdcp.h
>  API for polling client device status
>  IS_ENABLED used in header, for config status for mei_hdcp.
>v5:
>  Replacing the notifier with component framework. [Daniel]
>v6:
>  Rebased on the I915 comp master redesign.
>v7:
>  mei_hdcp_component_registered is made static [Uma]
>  Need for global static variable mei_cldev is removed.
>v8:
>  master comp is added to be matched with i915 subcomponent [daniel]
>
>Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
>Reviewed-by: Uma Shankar <uma.shankar@intel.com>

This is a new interface change and definitely a lot is changed from the time I reviewed.
You can drop my RB and I would suggest to go with Daniel and Tomas's feedback for the same.

>---
> drivers/misc/mei/hdcp/mei_hdcp.c | 90
>+++++++++++++++++++++++++++++++++++++++-
> drivers/misc/mei/hdcp/mei_hdcp.h |  5 +++
> 2 files changed, 93 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>b/drivers/misc/mei/hdcp/mei_hdcp.c
>index edfc70fb0617..be2ce12ca460 100644
>--- a/drivers/misc/mei/hdcp/mei_hdcp.c
>+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>@@ -23,6 +23,7 @@
> #include <linux/slab.h>
> #include <linux/uuid.h>
> #include <linux/mei_cl_bus.h>
>+#include <linux/component.h>
> #include <drm/drm_connector.h>
> #include <drm/i915_component.h>
> #include <drm/i915_mei_hdcp_interface.h> @@ -692,8 +693,7 @@
>mei_close_hdcp_session(struct device *dev, struct hdcp_port_data *data)
> 	return 0;
> }
>
>-static __attribute__((unused))
>-struct i915_hdcp_component_ops mei_hdcp_ops = {
>+static struct i915_hdcp_component_ops mei_hdcp_ops = {
> 	.owner = THIS_MODULE,
> 	.initiate_hdcp2_session = mei_initiate_hdcp2_session,
> 	.verify_receiver_cert_prepare_km =
>mei_verify_receiver_cert_prepare_km,
>@@ -708,20 +708,106 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
> 	.close_hdcp_session = mei_close_hdcp_session,  };
>
>+static int mei_component_master_bind(struct device *dev) {
>+	struct mei_cl_device *cldev = to_mei_cl_device(dev);
>+	struct mei_hdcp_drv_data *drv_data = mei_cldev_get_drvdata(cldev);
>+	int ret;
>+
>+	dev_info(dev, "%s\n", __func__);
>+	drv_data->comp_master->ops = &mei_hdcp_ops;
>+	drv_data->comp_master->mei_dev = dev;
>+	ret = component_bind_all(dev, drv_data->comp_master);
>+	if (ret < 0)
>+		return ret;
>+
>+	return 0;
>+}
>+
>+static void mei_component_master_unbind(struct device *dev) {
>+	struct mei_cl_device *cldev = to_mei_cl_device(dev);
>+	struct mei_hdcp_drv_data *drv_data = mei_cldev_get_drvdata(cldev);
>+
>+	dev_info(dev, "%s\n", __func__);
>+	component_unbind_all(dev, drv_data->comp_master); }
>+
>+static const struct component_master_ops mei_component_master_ops = {
>+	.bind = mei_component_master_bind,
>+	.unbind = mei_component_master_unbind, };
>+
>+static int mei_hdcp_component_match(struct device *dev, int subcomponent,
>+				    void *data)
>+{
>+	return !strcmp(dev->driver->name, "i915") &&
>+	       subcomponent == I915_COMPONENT_HDCP; }
>+
> static int mei_hdcp_probe(struct mei_cl_device *cldev,
> 			  const struct mei_cl_device_id *id)  {
>+	struct mei_hdcp_drv_data *drv_data;
> 	int ret;
>
> 	ret = mei_cldev_enable(cldev);
> 	if (ret < 0)
> 		dev_err(&cldev->dev, "mei_cldev_enable Failed. %d\n", ret);
>
>+	drv_data = kzalloc(sizeof(*drv_data), GFP_KERNEL);
>+	if (!drv_data) {
>+		ret = -ENOMEM;
>+		goto drv_data_exit;
>+	}
>+
>+	drv_data->comp_master = kzalloc(sizeof(*drv_data->comp_master),
>+					GFP_KERNEL);
>+	if (!drv_data->comp_master) {
>+		ret = -ENOMEM;
>+		goto comp_master_exit;
>+	}
>+
>+	drv_data->master_match = NULL;
>+	component_match_add_typed(&cldev->dev, &drv_data->master_match,
>+				  mei_hdcp_component_match,
>+				  drv_data->comp_master);
>+	if (IS_ERR_OR_NULL(drv_data->master_match)) {
>+		ret = -ENOMEM;
>+		goto match_add_exit;
>+	}
>+
>+	mei_cldev_set_drvdata(cldev, drv_data);
>+	ret = component_master_add_with_match(&cldev->dev,
>+					      &mei_component_master_ops,
>+					      drv_data->master_match);
>+	if (ret < 0) {
>+		dev_err(&cldev->dev, "Master comp add failed %d\n", ret);
>+		mei_cldev_set_drvdata(cldev, NULL);
>+		goto match_add_exit;
>+	}
>+
>+	return 0;
>+
>+match_add_exit:
>+	kfree(drv_data->comp_master);
>+comp_master_exit:
>+	kfree(drv_data);
>+drv_data_exit:
>+	mei_cldev_disable(cldev);
>+
> 	return ret;
> }
>
> static int mei_hdcp_remove(struct mei_cl_device *cldev)  {
>+	struct mei_hdcp_drv_data *drv_data = mei_cldev_get_drvdata(cldev);
>+
>+	component_master_del(&cldev->dev, &mei_component_master_ops);
>+	kfree(drv_data->comp_master);
>+	kfree(drv_data);
>+	mei_cldev_set_drvdata(cldev, NULL);
>+
> 	return mei_cldev_disable(cldev);
> }
>
>diff --git a/drivers/misc/mei/hdcp/mei_hdcp.h
>b/drivers/misc/mei/hdcp/mei_hdcp.h
>index f831db3cbd54..5c872a57ba11 100644
>--- a/drivers/misc/mei/hdcp/mei_hdcp.h
>+++ b/drivers/misc/mei/hdcp/mei_hdcp.h
>@@ -363,6 +363,11 @@ struct wired_cmd_repeater_auth_stream_req_out {
> 	struct hdcp_port_id	port;
> } __packed;
>
>+struct mei_hdcp_drv_data {
>+	struct i915_hdcp_comp_master *comp_master;
>+	struct component_match *master_match;
>+};
>+
> enum mei_hdcp_ddi {
> 	MEI_DDI_INVALID_PORT = 0x0,
>
>--
>2.7.4

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