From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755292Ab3KUAWJ (ORCPT ); Wed, 20 Nov 2013 19:22:09 -0500 Received: from mga02.intel.com ([134.134.136.20]:57746 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755176Ab3KUAWH (ORCPT ); Wed, 20 Nov 2013 19:22:07 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.93,535,1378882800"; d="scan'208";a="438872111" From: Jon Mason To: linux-kernel@vger.kernel.org Subject: [PATCH 2/9] NTB: Fix NTB-RP Link Up Date: Wed, 20 Nov 2013 17:21:23 -0700 Message-Id: <1384993290-10107-3-git-send-email-jon.mason@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1384993290-10107-1-git-send-email-jon.mason@intel.com> References: <1384993290-10107-1-git-send-email-jon.mason@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The Xeon NTB-RP setup, the transparent side does not get a link up/down interrupt. Since the presence of a NTB device on the transparent side means that we have a NTB link up, we can work around the lack of an interrupt by simply calling the link up function to notify the upper layers. Signed-off-by: Jon Mason --- drivers/ntb/ntb_hw.c | 36 ++++++++++++++++++++++++++++-------- 1 file changed, 28 insertions(+), 8 deletions(-) diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c index 6c9d733..a9b065f 100644 --- a/drivers/ntb/ntb_hw.c +++ b/drivers/ntb/ntb_hw.c @@ -1296,6 +1296,32 @@ static void ntb_free_debugfs(struct ntb_device *ndev) } } +static void ntb_hw_link_up(struct ntb_device *ndev) +{ + if (ndev->conn_type == NTB_CONN_TRANSPARENT) + ntb_link_event(ndev, NTB_LINK_UP); + else + /* Let's bring the NTB link up */ + writel(NTB_CNTL_BAR23_SNOOP | NTB_CNTL_BAR45_SNOOP, + ndev->reg_ofs.lnk_cntl); +} + +static void ntb_hw_link_down(struct ntb_device *ndev) +{ + u32 ntb_cntl; + + if (ndev->conn_type == NTB_CONN_TRANSPARENT) { + ntb_link_event(ndev, NTB_LINK_DOWN); + return; + } + + /* Bring NTB link down */ + ntb_cntl = readl(ndev->reg_ofs.lnk_cntl); + ntb_cntl &= ~(NTB_CNTL_BAR23_SNOOP | NTB_CNTL_BAR45_SNOOP); + ntb_cntl |= NTB_CNTL_LINK_DISABLE; + writel(ntb_cntl, ndev->reg_ofs.lnk_cntl); +} + static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct ntb_device *ndev; @@ -1384,9 +1410,7 @@ static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) if (rc) goto err6; - /* Let's bring the NTB link up */ - writel(NTB_CNTL_BAR23_SNOOP | NTB_CNTL_BAR45_SNOOP, - ndev->reg_ofs.lnk_cntl); + ntb_hw_link_up(ndev); return 0; @@ -1416,12 +1440,8 @@ static void ntb_pci_remove(struct pci_dev *pdev) { struct ntb_device *ndev = pci_get_drvdata(pdev); int i; - u32 ntb_cntl; - /* Bring NTB link down */ - ntb_cntl = readl(ndev->reg_ofs.lnk_cntl); - ntb_cntl |= NTB_CNTL_LINK_DISABLE; - writel(ntb_cntl, ndev->reg_ofs.lnk_cntl); + ntb_hw_link_down(ndev); ntb_transport_free(ndev->ntb_transport); -- 1.7.9.5