From patchwork Mon Sep 13 23:35:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kasireddy, Vivek" X-Patchwork-Id: 12491031 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D906AC433FE for ; Mon, 13 Sep 2021 23:49:02 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A5D4760EC0 for ; Mon, 13 Sep 2021 23:49:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org A5D4760EC0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2C46E6E2E1; Mon, 13 Sep 2021 23:48:45 +0000 (UTC) Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by gabe.freedesktop.org (Postfix) with ESMTPS id 222C46E2D5 for ; Mon, 13 Sep 2021 23:48:40 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10106"; a="285516272" X-IronPort-AV: E=Sophos;i="5.85,291,1624345200"; d="scan'208";a="285516272" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Sep 2021 16:48:39 -0700 X-IronPort-AV: E=Sophos;i="5.85,291,1624345200"; d="scan'208";a="543534426" Received: from vkasired-desk2.fm.intel.com ([10.105.128.127]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Sep 2021 16:48:38 -0700 From: Vivek Kasireddy To: dri-devel@lists.freedesktop.org Cc: Vivek Kasireddy Subject: [RFC v1 3/6] drm: Add a capability flag to support additional flip completion signalling Date: Mon, 13 Sep 2021 16:35:26 -0700 Message-Id: <20210913233529.3194401-4-vivek.kasireddy@intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210913233529.3194401-1-vivek.kasireddy@intel.com> References: <20210913233529.3194401-1-vivek.kasireddy@intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 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" If a driver supports this capability, it means that there would be an additional signalling mechanism for a page flip completion in addition to out_fence or DRM_MODE_PAGE_FLIP_EVENT. This capability may only be relevant for Virtual KMS drivers and is currently used only by virtio-gpu. Also, it can provide a potential solution for: https://gitlab.freedesktop.org/wayland/weston/-/issues/514 Signed-off-by: Vivek Kasireddy --- drivers/gpu/drm/drm_ioctl.c | 3 +++ include/drm/drm_mode_config.h | 8 ++++++++ include/uapi/drm/drm.h | 1 + 3 files changed, 12 insertions(+) diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c index 8b8744dcf691..8a420844f8bc 100644 --- a/drivers/gpu/drm/drm_ioctl.c +++ b/drivers/gpu/drm/drm_ioctl.c @@ -302,6 +302,9 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_ case DRM_CAP_CRTC_IN_VBLANK_EVENT: req->value = 1; break; + case DRM_CAP_RELEASE_FENCE: + req->value = dev->mode_config.release_fence; + break; default: return -EINVAL; } diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h index 12b964540069..944bebf359d7 100644 --- a/include/drm/drm_mode_config.h +++ b/include/drm/drm_mode_config.h @@ -935,6 +935,14 @@ struct drm_mode_config { */ bool normalize_zpos; + /** + * @release_fence: + * + * If this option is set, it means there would be an additional signalling + * mechanism for a page flip completion. + */ + bool release_fence; + /** * @modifiers_property: Plane property to list support modifier/format * combination. diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h index 3b810b53ba8b..8b8985f65581 100644 --- a/include/uapi/drm/drm.h +++ b/include/uapi/drm/drm.h @@ -767,6 +767,7 @@ struct drm_gem_open { * Documentation/gpu/drm-mm.rst, section "DRM Sync Objects". */ #define DRM_CAP_SYNCOBJ_TIMELINE 0x14 +#define DRM_CAP_RELEASE_FENCE 0x15 /* DRM_IOCTL_GET_CAP ioctl argument type */ struct drm_get_cap {