From patchwork Sat Jun 3 22:57:24 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Liu, Changpeng" X-Patchwork-Id: 25040 X-Patchwork-Delegate: thomas@monjalon.net Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [IPv6:::1]) by dpdk.org (Postfix) with ESMTP id DCD277D27; Sat, 3 Jun 2017 00:40:24 +0200 (CEST) Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by dpdk.org (Postfix) with ESMTP id 3D8AA7D14 for ; Sat, 3 Jun 2017 00:40:22 +0200 (CEST) Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Jun 2017 15:40:20 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.39,287,1493708400"; d="scan'208";a="269604970" Received: from fedora.sh.intel.com ([10.239.67.51]) by fmsmga004.fm.intel.com with ESMTP; 02 Jun 2017 15:40:17 -0700 From: Changpeng Liu To: dev@dpdk.org Cc: changpeng.liu@intel.com Date: Sun, 4 Jun 2017 06:57:24 +0800 Message-Id: <1496530644-8393-1-git-send-email-changpeng.liu@intel.com> X-Mailer: git-send-email 1.9.3 Subject: [dpdk-dev] [PATCH] pci/uio: enable prefetchable resources mapping X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" For PCI prefetchable resources, Linux will create a write combined file as well, the library will try to map resourceX_wc file first, if the file does not exist, then it will map resourceX as usual. Signed-off-by: Changpeng Liu --- lib/librte_eal/linuxapp/eal/eal_pci_uio.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c index fa10329..d9fc20a 100644 --- a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c +++ b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c @@ -321,7 +321,7 @@ /* update devname for mmap */ snprintf(devname, sizeof(devname), - "%s/" PCI_PRI_FMT "/resource%d", + "%s/" PCI_PRI_FMT "/resource%d_wc", pci_get_sysfs_path(), loc->domain, loc->bus, loc->devid, loc->function, res_idx); @@ -335,13 +335,22 @@ } /* - * open resource file, to mmap it + * open prefetchable resource file first, try to mmap it */ fd = open(devname, O_RDWR); if (fd < 0) { - RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", - devname, strerror(errno)); - goto error; + snprintf(devname, sizeof(devname), + "%s/" PCI_PRI_FMT "/resource%d", + pci_get_sysfs_path(), + loc->domain, loc->bus, loc->devid, + loc->function, res_idx); + /* then try to map resource file */ + fd = open(devname, O_RDWR); + if (fd < 0) { + RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", + devname, strerror(errno)); + goto error; + } } /* try mapping somewhere close to the end of hugepages */