From patchwork Fri Jul 25 03:28:06 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dheeraj Jamwal X-Patchwork-Id: 4708521 Return-Path: X-Original-To: patchwork-ltsi-dev@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 6B1D39F375 for ; Mon, 11 Aug 2014 18:44:33 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9BDBA2011E for ; Mon, 11 Aug 2014 18:44:32 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BB8DA2009C for ; Mon, 11 Aug 2014 18:44:31 +0000 (UTC) Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id CB607B57; Mon, 11 Aug 2014 18:42:54 +0000 (UTC) X-Original-To: ltsi-dev@lists.linuxfoundation.org Delivered-To: ltsi-dev@mail.linuxfoundation.org Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id F23A18E2 for ; Fri, 25 Jul 2014 03:25:51 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id A2A991FD46 for ; Fri, 25 Jul 2014 03:25:51 +0000 (UTC) Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP; 24 Jul 2014 20:25:51 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,727,1400050800"; d="scan'208";a="566985363" Received: from ubuntu-desktop.png.intel.com ([10.221.122.23]) by fmsmga001.fm.intel.com with ESMTP; 24 Jul 2014 20:25:49 -0700 From: Dheeraj Jamwal To: ltsi-dev@lists.linuxfoundation.org Date: Fri, 25 Jul 2014 11:28:06 +0800 Message-Id: <1406258918-18934-19-git-send-email-dheerajx.s.jamwal@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1406258918-18934-1-git-send-email-dheerajx.s.jamwal@intel.com> References: <1406258918-18934-1-git-send-email-dheerajx.s.jamwal@intel.com> X-Spam-Status: No, score=-4.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Mailman-Approved-At: Mon, 11 Aug 2014 18:42:51 +0000 Subject: [LTSI-dev] [PATCH 18/50] drm/i915: Only one open() allowed on pipe CRC result files X-BeenThere: ltsi-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "A list to discuss patches, development, and other things related to the LTSI project" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: ltsi-dev-bounces@lists.linuxfoundation.org Errors-To: ltsi-dev-bounces@lists.linuxfoundation.org X-Virus-Scanned: ClamAV using ClamSMTP From: Damien Lespiau It doesn't really make sense to have two processes dequeueing the CRC values at the same time. Forbid that usage. Signed-off-by: Damien Lespiau Signed-off-by: Daniel Vetter (cherry picked from commit be5c7a90753fb9f74c867f74489abe822ffb4b26) Signed-off-by: Dheeraj Jamwal --- drivers/gpu/drm/i915/i915_debugfs.c | 16 ++++++++++++++++ drivers/gpu/drm/i915/i915_drv.h | 1 + 2 files changed, 17 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 5137f8f..826ebce 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -1768,6 +1768,15 @@ struct pipe_crc_info { static int i915_pipe_crc_open(struct inode *inode, struct file *filep) { + struct pipe_crc_info *info = inode->i_private; + struct drm_i915_private *dev_priv = info->dev->dev_private; + struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[info->pipe]; + + if (!atomic_dec_and_test(&pipe_crc->available)) { + atomic_inc(&pipe_crc->available); + return -EBUSY; /* already open */ + } + filep->private_data = inode->i_private; return 0; @@ -1775,6 +1784,12 @@ static int i915_pipe_crc_open(struct inode *inode, struct file *filep) static int i915_pipe_crc_release(struct inode *inode, struct file *filep) { + struct pipe_crc_info *info = inode->i_private; + struct drm_i915_private *dev_priv = info->dev->dev_private; + struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[info->pipe]; + + atomic_inc(&pipe_crc->available); /* release the device */ + return 0; } @@ -2684,6 +2699,7 @@ void intel_display_crc_init(struct drm_device *dev) for (i = 0; i < INTEL_INFO(dev)->num_pipes; i++) { struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[i]; + atomic_set(&pipe_crc->available, 1); init_waitqueue_head(&pipe_crc->wq); } } diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 5cb9122..b4205b5 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1232,6 +1232,7 @@ struct intel_pipe_crc_entry { #define INTEL_PIPE_CRC_ENTRIES_NR 128 struct intel_pipe_crc { + atomic_t available; /* exclusive access to the device */ struct intel_pipe_crc_entry *entries; enum intel_pipe_crc_source source; atomic_t head, tail;