Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753992AbcJKO5A (ORCPT ); Tue, 11 Oct 2016 10:57:00 -0400 Received: from foss.arm.com ([217.140.101.70]:35420 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752053AbcJKOyn (ORCPT ); Tue, 11 Oct 2016 10:54:43 -0400 From: Brian Starkey To: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, liviu.dudau@arm.com, robdclark@gmail.com, hverkuil@xs4all.nl, eric@anholt.net, ville.syrjala@linux.intel.com, daniel@ffwll.ch Subject: [RFC PATCH 01/11] drm: Add writeback connector type Date: Tue, 11 Oct 2016 15:53:58 +0100 Message-Id: <1476197648-24918-2-git-send-email-brian.starkey@arm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1476197648-24918-1-git-send-email-brian.starkey@arm.com> References: <1476197648-24918-1-git-send-email-brian.starkey@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5135 Lines: 144 Writeback connectors represent writeback engines which can write the CRTC output to a memory framebuffer. Add a writeback connector type, hidden from userspace behind a client cap. They are hidden from non-aware clients so that they do not attempt to use writeback connectors to provide visual output to the user. Signed-off-by: Brian Starkey --- drivers/gpu/drm/drm_connector.c | 4 +++- drivers/gpu/drm/drm_crtc.c | 14 +++++++++++++- drivers/gpu/drm/drm_ioctl.c | 7 +++++++ include/drm/drmP.h | 2 ++ include/uapi/drm/drm.h | 10 ++++++++++ include/uapi/drm/drm_mode.h | 1 + 6 files changed, 36 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index 26bb78c7..027d7a9 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -86,6 +86,7 @@ static struct drm_conn_prop_enum_list drm_connector_enum_list[] = { { DRM_MODE_CONNECTOR_VIRTUAL, "Virtual" }, { DRM_MODE_CONNECTOR_DSI, "DSI" }, { DRM_MODE_CONNECTOR_DPI, "DPI" }, + { DRM_MODE_CONNECTOR_WRITEBACK, "Writeback" }, }; void drm_connector_ida_init(void) @@ -235,7 +236,8 @@ int drm_connector_init(struct drm_device *dev, list_add_tail(&connector->head, &config->connector_list); config->num_connector++; - if (connector_type != DRM_MODE_CONNECTOR_VIRTUAL) + if ((connector_type != DRM_MODE_CONNECTOR_VIRTUAL) && + (connector_type != DRM_MODE_CONNECTOR_WRITEBACK)) drm_object_attach_property(&connector->base, config->edid_property, 0); diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 2d7bedf..33f66e2 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -422,6 +422,14 @@ static int drm_mode_create_standard_properties(struct drm_device *dev) return 0; } +static bool +drm_connector_expose_to_userspace(const struct drm_connector *conn, + const struct drm_file *file_priv) +{ + return (file_priv->writeback_connectors) || + (conn->connector_type != DRM_MODE_CONNECTOR_WRITEBACK); +} + /** * drm_mode_getresources - get graphics configuration * @dev: drm device for the ioctl @@ -491,7 +499,8 @@ int drm_mode_getresources(struct drm_device *dev, void *data, crtc_count++; drm_for_each_connector(connector, dev) - connector_count++; + if (drm_connector_expose_to_userspace(connector, file_priv)) + connector_count++; drm_for_each_encoder(encoder, dev) encoder_count++; @@ -535,6 +544,9 @@ int drm_mode_getresources(struct drm_device *dev, void *data, copied = 0; connector_id = (uint32_t __user *)(unsigned long)card_res->connector_id_ptr; drm_for_each_connector(connector, dev) { + if (!drm_connector_expose_to_userspace(connector, file_priv)) + continue; + if (put_user(connector->base.id, connector_id + copied)) { ret = -EFAULT; diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c index 0ad2c47..838a6e8 100644 --- a/drivers/gpu/drm/drm_ioctl.c +++ b/drivers/gpu/drm/drm_ioctl.c @@ -308,6 +308,13 @@ drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) file_priv->atomic = req->value; file_priv->universal_planes = req->value; break; + case DRM_CLIENT_CAP_WRITEBACK_CONNECTORS: + if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) + return -EINVAL; + if (req->value > 1) + return -EINVAL; + file_priv->writeback_connectors = req->value; + break; default: return -EINVAL; } diff --git a/include/drm/drmP.h b/include/drm/drmP.h index 0e99669..222d5dc 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -388,6 +388,8 @@ struct drm_file { unsigned universal_planes:1; /* true if client understands atomic properties */ unsigned atomic:1; + /* true if client understands writeback connectors */ + unsigned writeback_connectors:1; /* * This client is the creator of @master. * Protected by struct drm_device::master_mutex. diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h index b2c5284..d2b4543 100644 --- a/include/uapi/drm/drm.h +++ b/include/uapi/drm/drm.h @@ -678,6 +678,16 @@ struct drm_get_cap { */ #define DRM_CLIENT_CAP_ATOMIC 3 +/** + * DRM_CLIENT_CAP_WRITEBACK_CONNECTORS + * + * If set to 1, the DRM core will expose writeback connectors to userspace. + * Writeback connectors act differently to normal connectors (e.g. there will + * be no screen output if only writeback connectors are enabled), so we hide + * them from non-aware clients. + */ +#define DRM_CLIENT_CAP_WRITEBACK_CONNECTORS 4 + /** DRM_IOCTL_SET_CLIENT_CAP ioctl argument type */ struct drm_set_client_cap { __u64 capability; diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index df0e350..e9cb4fe 100644 --- a/include/uapi/drm/drm_mode.h +++ b/include/uapi/drm/drm_mode.h @@ -247,6 +247,7 @@ struct drm_mode_get_encoder { #define DRM_MODE_CONNECTOR_VIRTUAL 15 #define DRM_MODE_CONNECTOR_DSI 16 #define DRM_MODE_CONNECTOR_DPI 17 +#define DRM_MODE_CONNECTOR_WRITEBACK 18 struct drm_mode_get_connector { -- 1.7.9.5