On Mon, 8 Jul 2019 16:51:14 +0530
Ramalingam C <ramalingam.c@xxxxxxxxx> wrote:
> drm function is defined and exported to update a connector's
> content protection property state and to generate a uevent along
> with it.
>
> Need ACK for the uevent from userspace consumer.
>
> v2:
> Update only when state is different from old one.
> v3:
> KDoc is added [Daniel]
> v4:
> KDoc is extended bit more [pekka]
> v5:
> Uevent usage is documented at kdoc of "Content Protection" also
> [pekka]
>
> Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
> Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
> drivers/gpu/drm/drm_connector.c | 17 +++++++++++++----
> drivers/gpu/drm/drm_hdcp.c | 34 +++++++++++++++++++++++++++++++++
> include/drm/drm_hdcp.h | 2 ++
> 3 files changed, 49 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 732f6645643d..6de906ef10b3 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -947,10 +947,19 @@ static const struct drm_prop_enum_list hdmi_colorspaces[] = {
> * - If the state is DESIRED, kernel should attempt to re-authenticate the
> * link whenever possible. This includes across disable/enable, dpms,
> * hotplug, downstream device changes, link status failures, etc..
> - * - Userspace is responsible for polling the property to determine when
> - * the value transitions from ENABLED to DESIRED. This signifies the link
> - * is no longer protected and userspace should take appropriate action
> - * (whatever that might be).
> + * - Kernel sends uevent with the connector id and property id through
> + * @drm_hdcp_update_content_protection, upon below kernel triggered
> + * scenarios:
> + * DESIRED -> ENABLED (authentication success)
> + * ENABLED -> DESIRED (termination of authentication)
> + * - Please note no uevents for userspace triggered property state changes,
> + * which can't fail such as
> + * DESIRED/ENABLED -> UNDESIRED
> + * UNDESIRED -> DESIRED
> + * - Userspace is responsible for polling the property or listen to uevents
> + * to determine when the value transitions from ENABLED to DESIRED.
> + * This signifies the link is no longer protected and userspace should
> + * take appropriate action (whatever that might be).
Yes!
This doc is exactly what I hoped to see. Good job.
This is also exactly how
https://gitlab.freedesktop.org/wayland/weston/merge_requests/48 deals
with this in userspace. That MR still has some open issues, but I think
nothing related to the uevent.
Thanks,
pq
> *
> * HDCP Content Type:
> * This Enum property is used by the userspace to declare the content type
> diff --git a/drivers/gpu/drm/drm_hdcp.c b/drivers/gpu/drm/drm_hdcp.c
> index ce235fd1c844..77433ee3d652 100644
> --- a/drivers/gpu/drm/drm_hdcp.c
> +++ b/drivers/gpu/drm/drm_hdcp.c
> @@ -374,6 +374,10 @@ DRM_ENUM_NAME_FN(drm_get_hdcp_content_type_name,
> *
> * The content protection will be set to &drm_connector_state.content_protection
> *
> + * When kernel triggered content protection state change like DESIRED->ENABLED
> + * and ENABLED->DESIRED, will use drm_hdcp_update_content_protection() to update
> + * the content protection state of a connector.
> + *
> * Returns:
> * Zero on success, negative errno on failure.
> */
> @@ -414,3 +418,33 @@ int drm_connector_attach_content_protection_property(
> return 0;
> }
> EXPORT_SYMBOL(drm_connector_attach_content_protection_property);
> +
> +/**
> + * drm_hdcp_update_content_protection - Updates the content protection state
> + * of a connector
> + *
> + * @connector: drm_connector on which content protection state needs an update
> + * @val: New state of the content protection property
> + *
> + * This function can be used by display drivers, to update the kernel triggered
> + * content protection state changes of a drm_connector such as DESIRED->ENABLED
> + * and ENABLED->DESIRED. No uevent for DESIRED->UNDESIRED or ENABLED->UNDESIRED,
> + * as userspace is triggering such state change and kernel performs it without
> + * fail.This function update the new state of the property into the connector's
> + * state and generate an uevent to notify the userspace.
> + */
> +void drm_hdcp_update_content_protection(struct drm_connector *connector,
> + u64 val)
> +{
> + struct drm_device *dev = connector->dev;
> + struct drm_connector_state *state = connector->state;
> +
> + WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
> + if (state->content_protection == val)
> + return;
> +
> + state->content_protection = val;
> + drm_sysfs_connector_status_event(connector,
> + dev->mode_config.content_protection_property);
> +}
> +EXPORT_SYMBOL(drm_hdcp_update_content_protection);
> diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h
> index 2970abdfaf12..dd864ac9ce85 100644
> --- a/include/drm/drm_hdcp.h
> +++ b/include/drm/drm_hdcp.h
> @@ -292,4 +292,6 @@ bool drm_hdcp_check_ksvs_revoked(struct drm_device *dev,
> u8 *ksvs, u32 ksv_count);
> int drm_connector_attach_content_protection_property(
> struct drm_connector *connector, bool hdcp_content_type);
> +void drm_hdcp_update_content_protection(struct drm_connector *connector,
> + u64 val);
> #endif
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