From patchwork Tue Dec 5 05:15:02 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Paul X-Patchwork-Id: 10092093 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2022560329 for ; Tue, 5 Dec 2017 05:15:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 125932868C for ; Tue, 5 Dec 2017 05:15:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0766A28DA2; Tue, 5 Dec 2017 05:15:49 +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=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED, T_DKIM_INVALID 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 7C6BE2868C for ; Tue, 5 Dec 2017 05:15:48 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C0B1A6E404; Tue, 5 Dec 2017 05:15:45 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mail-yw0-x242.google.com (mail-yw0-x242.google.com [IPv6:2607:f8b0:4002:c05::242]) by gabe.freedesktop.org (Postfix) with ESMTPS id E49F06E402 for ; Tue, 5 Dec 2017 05:15:43 +0000 (UTC) Received: by mail-yw0-x242.google.com with SMTP id m129so7646388ywb.11 for ; Mon, 04 Dec 2017 21:15:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=l0k7VCnG5uXYReZha7xsKGI3NVHc1JHebmlD4JjCl0s=; b=EA5cxxxuEvYfEFWylLC4nXMMyTWc5tRQPnEtrSaaHSvFHjJZKCSA0l1jR7OvuPyJlD caP8P1a4NNroeB5TJdRVGVqq3X5/E6CJYTaCNaBRl9FfCs644KRkO/8Lssl9feTSo+VP uryCtW4HeDEqXPAVpqBgSzZXMGW3uL8s9P5Bk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=l0k7VCnG5uXYReZha7xsKGI3NVHc1JHebmlD4JjCl0s=; b=EDI13KhWDdk/SwQgrD3RdzlUy7IaxZe1NYCQmsGkQ4lsqyhurJQ6V4cldJdtHRHSyI OK4tQJ0xTichjhjrSs2e7d3zaWaFPGvFDQzK+V+FYnOGdDndcIkMiiumoHS7izvYj+2B Jn+AFCyrbcY7/RBiqhghTmOQLFMwSWmFv6rx8u9eQFbFszqFweRhd9HuWFTwKTQlFAMF fGvgb1P2aqwVePT96EqxEP/Z4Y5CWYbFhuVBE1wshu62TV1AJxMY3X+ahhMyJqKn91QF hLuPGPXGHQ3Cq1GuQjOSHUfBSrMw0Kex6LZbgpeyWDrYcwH7tqVeTcbMPqWBMOK7MTKx bwNA== X-Gm-Message-State: AJaThX4XG3/Dkut0p6adI56gvi5tqBE2khhhS3n2+VV2dX12BOlZw4Oc zG/UO7VAQbsiiBb1puNNwmoqV4dd2nc= X-Google-Smtp-Source: AGs4zMY1zuo/7ZO6/nxOI9yuqiKGHX/cntMfIygIctnDmHQZKScxdRnYIbXESTxbWLo40PcSrpgl0w== X-Received: by 10.129.83.67 with SMTP id h64mr11274479ywb.169.1512450942865; Mon, 04 Dec 2017 21:15:42 -0800 (PST) Received: from rosewood.cam.corp.google.com ([2620:0:1013:11:d3af:69ac:1964:28e8]) by smtp.gmail.com with ESMTPSA id z145sm2647231ywa.98.2017.12.04.21.15.42 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 04 Dec 2017 21:15:42 -0800 (PST) From: Sean Paul To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Date: Tue, 5 Dec 2017 00:15:02 -0500 Message-Id: <20171205051513.8603-4-seanpaul@chromium.org> X-Mailer: git-send-email 2.15.0.531.g2ccb3012c9-goog In-Reply-To: <20171205051513.8603-1-seanpaul@chromium.org> References: <20171205051513.8603-1-seanpaul@chromium.org> Cc: seanpaul@google.com, David Airlie , linux-kernel@vger.kernel.org, daniel.vetter@intel.com Subject: [Intel-gfx] [PATCH v3 3/9] drm: Add Content Protection property X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP This patch adds a new optional connector property to allow userspace to enable protection over the content it is displaying. This will typically be implemented by the driver using HDCP. The property is a tri-state with the following values: - OFF: Self explanatory, no content protection - DESIRED: Userspace requests that the driver enable protection - ENABLED: Once the driver has authenticated the link, it sets this value The driver is responsible for downgrading ENABLED to DESIRED if the link becomes unprotected. The driver should also maintain the desiredness of protection across hotplug/dpms/suspend. If this looks familiar, I posted [1] this 3 years ago. We have been using this in ChromeOS across exynos, mediatek, and rockchip over that time. Changes in v2: - Pimp kerneldoc for content_protection_property (Daniel) - Drop sysfs attribute Changes in v3: - None Cc: Daniel Vetter Signed-off-by: Sean Paul [1] https://lists.freedesktop.org/archives/dri-devel/2014-December/073336.html Reviewed-by: Daniel Vetter --- drivers/gpu/drm/drm_atomic.c | 8 +++++ drivers/gpu/drm/drm_connector.c | 71 +++++++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/drm_sysfs.c | 1 + include/drm/drm_connector.h | 16 ++++++++++ include/uapi/drm/drm_mode.h | 4 +++ 5 files changed, 100 insertions(+) diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index c2da5585e201..676025d755b2 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1196,6 +1196,12 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector, state->picture_aspect_ratio = val; } else if (property == connector->scaling_mode_property) { state->scaling_mode = val; + } else if (property == connector->content_protection_property) { + if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) { + DRM_DEBUG_KMS("only drivers can set CP Enabled\n"); + return -EINVAL; + } + state->content_protection = val; } else if (connector->funcs->atomic_set_property) { return connector->funcs->atomic_set_property(connector, state, property, val); @@ -1275,6 +1281,8 @@ drm_atomic_connector_get_property(struct drm_connector *connector, *val = state->picture_aspect_ratio; } else if (property == connector->scaling_mode_property) { *val = state->scaling_mode; + } else if (property == connector->content_protection_property) { + *val = state->content_protection; } else if (connector->funcs->atomic_get_property) { return connector->funcs->atomic_get_property(connector, state, property, val); diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index f14b48e6e839..8626aa8f485e 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -698,6 +698,13 @@ static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = { DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name, drm_tv_subconnector_enum_list) +static struct drm_prop_enum_list drm_cp_enum_list[] = { + { DRM_MODE_CONTENT_PROTECTION_OFF, "Off" }, + { DRM_MODE_CONTENT_PROTECTION_DESIRED, "Desired" }, + { DRM_MODE_CONTENT_PROTECTION_ENABLED, "Enabled" }, +}; +DRM_ENUM_NAME_FN(drm_get_content_protection_name, drm_cp_enum_list) + /** * DOC: standard connector properties * @@ -764,6 +771,34 @@ DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name, * after modeset, the kernel driver may set this to "BAD" and issue a * hotplug uevent. Drivers should update this value using * drm_mode_connector_set_link_status_property(). + * Content Protection: + * This property is used by userspace to request the kernel protect future + * content communicated over the link. When requested, kernel will apply + * the appropriate means of protection (most often HDCP), and use the + * property to tell userspace the protection is active. + * + * The value of this property can be one of the following: + * + * - DRM_MODE_CONTENT_PROTECTION_OFF = 0 + * The link is not protected, content is transmitted in the clear. + * - DRM_MODE_CONTENT_PROTECTION_DESIRED = 1 + * Userspace has requested content protection, but the link is not + * currently protected. When in this state, kernel should enable + * Content Protection as soon as possible. + * - DRM_MODE_CONTENT_PROTECTION_ENABLED = 2 + * Userspace has requested content protection, and the link is + * protected. Only the driver can set the property to this value. + * If userspace attempts to set to ENABLED, kernel will return + * -EINVAL. + * + * A few guidelines: + * + * - DESIRED state should be preserved until userspace de-asserts it by + * setting the property to OFF. This means ENABLED should only transition + * to OFF when the user explicitly requests it. + * - 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.. * * Connectors also have one standardized atomic property: * @@ -1047,6 +1082,42 @@ int drm_connector_attach_scaling_mode_property(struct drm_connector *connector, } EXPORT_SYMBOL(drm_connector_attach_scaling_mode_property); +/** + * drm_connector_attach_content_protection_property - attach content protection + * property + * + * @connector: connector to attach CP property on. + * + * This is used to add support for content protection on select connectors. + * Content Protection is intentionally vague to allow for different underlying + * technologies, however it is most implemented by HDCP. + * + * The content protection will be set to &drm_connector_state.content_protection + * + * Returns: + * Zero on success, negative errno on failure. + */ +int drm_connector_attach_content_protection_property( + struct drm_connector *connector) +{ + struct drm_device *dev = connector->dev; + struct drm_property *prop; + + prop = drm_property_create_enum(dev, 0, "Content Protection", + drm_cp_enum_list, + ARRAY_SIZE(drm_cp_enum_list)); + if (!prop) + return -ENOMEM; + + drm_object_attach_property(&connector->base, prop, + DRM_MODE_CONTENT_PROTECTION_OFF); + + connector->content_protection_property = prop; + + return 0; +} +EXPORT_SYMBOL(drm_connector_attach_content_protection_property); + /** * drm_mode_create_aspect_ratio_property - create aspect ratio property * @dev: DRM device diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c index 1c5b5ce1fd7f..2385c7e0bef5 100644 --- a/drivers/gpu/drm/drm_sysfs.c +++ b/drivers/gpu/drm/drm_sysfs.c @@ -21,6 +21,7 @@ #include #include #include "drm_internal.h" +#include "drm_crtc_internal.h" #define to_drm_minor(d) dev_get_drvdata(d) #define to_drm_connector(d) dev_get_drvdata(d) diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 7a7140543012..828878addd03 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -370,6 +370,12 @@ struct drm_connector_state { * upscaling, mostly used for built-in panels. */ unsigned int scaling_mode; + + /** + * @content_protection: Connector property to request content + * protection. This is most commonly used for HDCP. + */ + unsigned int content_protection; }; /** @@ -718,6 +724,7 @@ struct drm_cmdline_mode { * @tile_h_size: horizontal size of this tile. * @tile_v_size: vertical size of this tile. * @scaling_mode_property: Optional atomic property to control the upscaling. + * @content_protection_property: Optional property to control content protection * * Each connector may be connected to one or more CRTCs, or may be clonable by * another connector if they can share a CRTC. Each connector also has a specific @@ -808,6 +815,12 @@ struct drm_connector { struct drm_property *scaling_mode_property; + /** + * @content_protection_property: DRM ENUM property for content + * protection + */ + struct drm_property *content_protection_property; + /** * @path_blob_ptr: * @@ -1002,6 +1015,7 @@ const char *drm_get_dvi_i_subconnector_name(int val); const char *drm_get_dvi_i_select_name(int val); const char *drm_get_tv_subconnector_name(int val); const char *drm_get_tv_select_name(int val); +const char *drm_get_content_protection_name(int val); int drm_mode_create_dvi_i_properties(struct drm_device *dev); int drm_mode_create_tv_properties(struct drm_device *dev, @@ -1010,6 +1024,8 @@ int drm_mode_create_tv_properties(struct drm_device *dev, int drm_mode_create_scaling_mode_property(struct drm_device *dev); int drm_connector_attach_scaling_mode_property(struct drm_connector *connector, u32 scaling_mode_mask); +int drm_connector_attach_content_protection_property( + struct drm_connector *connector); int drm_mode_create_aspect_ratio_property(struct drm_device *dev); int drm_mode_create_suggested_offset_properties(struct drm_device *dev); diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index 5597a87154e5..03f4d22305c2 100644 --- a/include/uapi/drm/drm_mode.h +++ b/include/uapi/drm/drm_mode.h @@ -173,6 +173,10 @@ extern "C" { DRM_MODE_REFLECT_X | \ DRM_MODE_REFLECT_Y) +/* Content Protection Flags */ +#define DRM_MODE_CONTENT_PROTECTION_OFF 0 +#define DRM_MODE_CONTENT_PROTECTION_DESIRED 1 +#define DRM_MODE_CONTENT_PROTECTION_ENABLED 2 struct drm_mode_modeinfo { __u32 clock;