From patchwork Mon Jul 8 11:21:14 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ramalingam C X-Patchwork-Id: 11035595 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 317061805 for ; Mon, 8 Jul 2019 18:20:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 221E328647 for ; Mon, 8 Jul 2019 18:20:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 16D1A28657; Mon, 8 Jul 2019 18:20:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.7 required=2.0 tests=BAYES_00,DATE_IN_PAST_06_12, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id AA67928647 for ; Mon, 8 Jul 2019 18:20:30 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3C0D36E038; Mon, 8 Jul 2019 18:20:19 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8C9BD6E038; Mon, 8 Jul 2019 18:20:16 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Jul 2019 11:20:16 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,466,1557212400"; d="scan'208";a="176240768" Received: from ramaling-i9x.iind.intel.com ([10.99.66.154]) by orsmga002.jf.intel.com with ESMTP; 08 Jul 2019 11:20:14 -0700 From: Ramalingam C To: intel-gfx , dri-devel , Daniel Vetter Subject: [PATCH v9 4/6] drm/hdcp: update content protection property with uevent Date: Mon, 8 Jul 2019 16:51:14 +0530 Message-Id: <20190708112116.1780-5-ramalingam.c@intel.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190708112116.1780-1-ramalingam.c@intel.com> References: <20190708112116.1780-1-ramalingam.c@intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP 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 Reviewed-by: Daniel Vetter --- 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). * * 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