From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 0C554C0219B for ; Wed, 12 Feb 2025 01:03:01 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C0ABB10E1CD; Wed, 12 Feb 2025 01:03:01 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="SFwCc07r"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.16]) by gabe.freedesktop.org (Postfix) with ESMTPS id F1BC510E1CD for ; Wed, 12 Feb 2025 01:02:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1739322180; x=1770858180; h=from:to:subject:date:message-id:mime-version: content-transfer-encoding; bh=2ut+hjgKMF2pZYM6/LyfZh7XG+O8vY17ivh3ngj0lBk=; b=SFwCc07rxoGFA+pu8RvPp4ynfXHmlgdWDXs1uDoLjGCTGwjH1U++Dd4y W5KkdlklA/hSHql/jAnHCSEwx7E4fGO5CLRKuz4gEAngo83P7mEZg3jNq 7QlYtfJtk7zD1BrFrp4b6lUH7huCAFxe6h9sNqJYoDJpTm5b9o6rbMOAp QuBhZKgpEqTPWrtGd7nfvJM4FzjIXrpB4HbyR7VpwR+S0acBLZZXhYfF6 MBw91Dc3eJi+AKoyNuxd2k/agK6NYcCJIHbpl2QHhxYm+IpnQnDNhBLrl SH7+jYQo/c+AAhQoHOSricPFaGSuUg6hMQGT28y7P14srH3OyN2Q0g10s w==; X-CSE-ConnectionGUID: anxMSEnER/S+s+DQF1fkEg== X-CSE-MsgGUID: wluuL3iETSyOAuKkX+QR7w== X-IronPort-AV: E=McAfee;i="6700,10204,11342"; a="27564197" X-IronPort-AV: E=Sophos;i="6.13,279,1732608000"; d="scan'208";a="27564197" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Feb 2025 17:02:59 -0800 X-CSE-ConnectionGUID: ZPqPyLYNSdizB6GbI0iPng== X-CSE-MsgGUID: 6xdWFEIARQy4+3pYgKsnOA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,199,1725346800"; d="scan'208";a="117607853" Received: from dut4463arlhx.fm.intel.com ([10.105.10.25]) by ORVIESA003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Feb 2025 17:03:00 -0800 From: Umesh Nerlige Ramappa To: Ashutosh Dixit , intel-xe@lists.freedesktop.org Subject: [PATCH] drm/xe/oa: Ensure that polled read returns latest data Date: Tue, 11 Feb 2025 17:02:55 -0800 Message-Id: <20250212010255.1423343-1-umesh.nerlige.ramappa@intel.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" In polled mode, user calls poll() for read data to be available before performing a read(). In the duration between these 2 calls, there may be new data available in the OA buffer. To ensure user reads all available data, check for latest data in the OA buffer in polled read. Signed-off-by: Umesh Nerlige Ramappa --- drivers/gpu/drm/xe/xe_oa.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/xe/xe_oa.c b/drivers/gpu/drm/xe/xe_oa.c index fa873f3d0a9d..a692dffcb638 100644 --- a/drivers/gpu/drm/xe/xe_oa.c +++ b/drivers/gpu/drm/xe/xe_oa.c @@ -548,6 +548,7 @@ static ssize_t xe_oa_read(struct file *file, char __user *buf, mutex_unlock(&stream->stream_lock); } while (!offset && !ret); } else { + xe_oa_buffer_check_unlocked(stream); mutex_lock(&stream->stream_lock); ret = __xe_oa_read(stream, buf, count, &offset); mutex_unlock(&stream->stream_lock); -- 2.34.1