From patchwork Fri Mar 18 23:14:54 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 8624271 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 1E6C99F44D for ; Fri, 18 Mar 2016 23:15:29 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4DC5F20396 for ; Fri, 18 Mar 2016 23:15:28 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 7C33320394 for ; Fri, 18 Mar 2016 23:15:27 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 87D9B6E40B; Fri, 18 Mar 2016 23:15:16 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-qk0-x230.google.com (mail-qk0-x230.google.com [IPv6:2607:f8b0:400d:c09::230]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4E5F86E19D; Fri, 18 Mar 2016 23:15:13 +0000 (UTC) Received: by mail-qk0-x230.google.com with SMTP id o6so55698379qkc.2; Fri, 18 Mar 2016 16:15:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=4FdZ5XehNSsAR0SxlNLOvHzQAo1NtliXDhNwxPXGfIE=; b=MaOadNbB63Y8DFPMdPZe3gDQ5D87E6OjgVR0G6OSBpoebSGMWPbSPvmOKvq84beTSC lWdyVb3hv/xLxgY7bsX/4DZWemYlhjsqe4NFcpt0y10OwviWlU5cgqi3LmfI7XASmGBv xk7YgLi2mRdISZzNxQVsvovtVRP1LwV3eEbaoX6gppFY9n+B1pals3G2razVlTUf0Oq+ g04uvsu1WQEiQuPSgZ2aa+6eWiolVEP+6keNA8kx8QDDXMwETqs95CDvVUmeYEeCTz2j WdsnF3QVQQFQSWjGjBJRbDftDv6cbkALWY7JX3v6TYWwOvlgThQkEFYg7yFA/mQ8MzK4 AyFg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=4FdZ5XehNSsAR0SxlNLOvHzQAo1NtliXDhNwxPXGfIE=; b=Cb+vlJo2nqMyCKug9Eq4rlYKraxOrNBER+5/kSu4PjRx+aPEaBBPmd/4Q6yZ8AISR2 DYXHcJ5LerMCB7KMexucmLlqiDTMjXnGde5ep0YRp7BSn6H5HlriyvW3oBuoojziF5T7 MJsICUato9MvDMLpqzkt8xhGl0kkMwSIc7pGXUkvvaFwtaQ7Jgmgn3ZI2VXA8JlczXAJ nvArVtrlWCCk0QcXQQ61HFV2IeJkZyZ8zGw/xWQAxbbQ9yAx2+SeorXcxfFN2sxLPH4A bEWrH0yofk1z3qTa93M8P1xNKGvM7m8YXkAGxwebd8kIh2baZ0TrP4XdCHTVDlKV+kJT 4f1A== X-Gm-Message-State: AD7BkJLrFC0yYMzzg5M/J/y6flCSk1QxrVyveoJJ7sVUL7mykzTVOpwuALzfnHzHMgptGw== X-Received: by 10.55.74.197 with SMTP id x188mr25927135qka.104.1458342911328; Fri, 18 Mar 2016 16:15:11 -0700 (PDT) Received: from localhost ([2601:184:4000:90da:6af7:28ff:fe77:e429]) by smtp.gmail.com with ESMTPSA id b40sm7033651qga.7.2016.03.18.16.15.10 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 18 Mar 2016 16:15:10 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Subject: [PATCH 01/11] reservation: add reservation_object_get_excl_unlocked() Date: Fri, 18 Mar 2016 19:14:54 -0400 Message-Id: <1458342904-23326-2-git-send-email-robdclark@gmail.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1458342904-23326-1-git-send-email-robdclark@gmail.com> References: <1458342904-23326-1-git-send-email-robdclark@gmail.com> Cc: maarten.lankhorst@canonical.com, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Spam-Status: No, score=-4.1 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In the atomic modesetting path, each driver simply wants to grab a ref to the exlusive fence from a reservation object to store in the incoming drm_plane_state, without doing the whole RCU dance. Since each driver will need to do this, lets make a helper. Signed-off-by: Rob Clark --- include/linux/reservation.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/include/linux/reservation.h b/include/linux/reservation.h index 5a0b64c..7a018a9 100644 --- a/include/linux/reservation.h +++ b/include/linux/reservation.h @@ -120,6 +120,24 @@ reservation_object_get_excl(struct reservation_object *obj) reservation_object_held(obj)); } +static inline struct fence * +reservation_object_get_excl_unlocked(struct reservation_object *obj) +{ + struct fence *fence; + unsigned seq; +retry: + seq = read_seqcount_begin(&obj->seq); + rcu_read_lock(); + fence = rcu_dereference(obj->fence_excl); + if (read_seqcount_retry(&obj->seq, seq)) { + rcu_read_unlock(); + goto retry; + } + fence = fence_get(fence); + rcu_read_unlock(); + return fence; +} + int reservation_object_reserve_shared(struct reservation_object *obj); void reservation_object_add_shared_fence(struct reservation_object *obj, struct fence *fence);