From patchwork Mon Jul 29 12:52:06 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kirsher, Jeffrey T" X-Patchwork-Id: 2834935 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@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 AD4869F4D4 for ; Mon, 29 Jul 2013 12:52:51 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9143A201E3 for ; Mon, 29 Jul 2013 12:52:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 470C4201DD for ; Mon, 29 Jul 2013 12:52:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755610Ab3G2Mwe (ORCPT ); Mon, 29 Jul 2013 08:52:34 -0400 Received: from mga03.intel.com ([143.182.124.21]:38183 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753692Ab3G2Mwc (ORCPT ); Mon, 29 Jul 2013 08:52:32 -0400 Received: from azsmga001.ch.intel.com ([10.2.17.19]) by azsmga101.ch.intel.com with ESMTP; 29 Jul 2013 05:52:31 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.89,769,1367996400"; d="scan'208";a="338440762" Received: from unknown (HELO jtkirshe-mobl.amr.corp.intel.com) ([10.255.14.40]) by azsmga001.ch.intel.com with ESMTP; 29 Jul 2013 05:52:25 -0700 From: Jeff Kirsher To: davem@davemloft.net, bhelgaas@google.com Cc: Jacob Keller , netdev@vger.kernel.org, gospo@redhat.com, sassmann@redhat.com, linux-pci@vger.kernel.org, Jeff Kirsher Subject: [net-next 10/15] pci: Add function to obtain minimum link width and speed Date: Mon, 29 Jul 2013 05:52:06 -0700 Message-Id: <1375102331-23905-11-git-send-email-jeffrey.t.kirsher@intel.com> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1375102331-23905-1-git-send-email-jeffrey.t.kirsher@intel.com> References: <1375102331-23905-1-git-send-email-jeffrey.t.kirsher@intel.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-8.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, 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-Virus-Scanned: ClamAV using ClamSMTP From: Jacob Keller A PCI Express device can potentially report a link width and speed which it will not properly fulfill due to being plugged into a slower link higher in the chain. This function walks up the PCI bus chain and calculates the minimum link width and speed of this entire chain. This can be useful to enable a device to determine if it has enough bandwidth for optimum functionality. Signed-off-by: Jacob Keller Tested-by: Phil Schmitt Signed-off-by: Jeff Kirsher Acked-by: Bjorn Helgaas --- drivers/pci/pci.c | 43 +++++++++++++++++++++++++++++++++++++++++++ include/linux/pci.h | 2 ++ 2 files changed, 45 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e37fea6..c71e78c 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3579,6 +3579,49 @@ int pcie_set_mps(struct pci_dev *dev, int mps) } /** + * pcie_get_minimum_link - determine minimum link settings of a PCI device + * @dev: PCI device to query + * @speed: storage for minimum speed + * @width: storage for minimum width + * + * This function will walk up the PCI device chain and determine the minimum + * link width and speed of the device. + */ +int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed, + enum pcie_link_width *width) +{ + int ret; + + *speed = PCI_SPEED_UNKNOWN; + *width = PCIE_LNK_WIDTH_UNKNOWN; + + while (dev) { + u16 lnksta; + enum pci_bus_speed next_speed; + enum pcie_link_width next_width; + + ret = pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta); + if (ret) + return ret; + + next_speed = pcie_link_speed[lnksta & PCI_EXP_LNKSTA_CLS]; + next_width = (lnksta & PCI_EXP_LNKSTA_NLW) >> + PCI_EXP_LNKSTA_NLW_SHIFT; + + if (next_speed < *speed) + *speed = next_speed; + + if (next_width < *width) + *width = next_width; + + dev = dev->bus->self; + } + + return 0; +} +EXPORT_SYMBOL(pcie_get_minimum_link); + +/** * pci_select_bars - Make BAR mask from the type of resource * @dev: the PCI device for which BAR mask is made * @flags: resource type mask to be selected diff --git a/include/linux/pci.h b/include/linux/pci.h index fc2d1fb..38994de 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -937,6 +937,8 @@ int pcie_get_readrq(struct pci_dev *dev); int pcie_set_readrq(struct pci_dev *dev, int rq); int pcie_get_mps(struct pci_dev *dev); int pcie_set_mps(struct pci_dev *dev, int mps); +int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed, + enum pcie_link_width *width); int __pci_reset_function(struct pci_dev *dev); int __pci_reset_function_locked(struct pci_dev *dev); int pci_reset_function(struct pci_dev *dev);