From patchwork Sat Jan 20 06:35:18 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oza Pawandeep X-Patchwork-Id: 10176283 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 29AA86023A for ; Sat, 20 Jan 2018 06:36:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1653328811 for ; Sat, 20 Jan 2018 06:36:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 08EC42880B; Sat, 20 Jan 2018 06:36:20 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6E0092880B for ; Sat, 20 Jan 2018 06:36:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751251AbeATGgG (ORCPT ); Sat, 20 Jan 2018 01:36:06 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:46024 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754735AbeATGfy (ORCPT ); Sat, 20 Jan 2018 01:35:54 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 207AB60A37; Sat, 20 Jan 2018 06:35:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1516430154; bh=GU0zoHu1r8A4zUs3llbho9BWx2wlQVqtGuiWjzNEYqc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=R/rv9RcEp2xSGbREuuP9U7mUt3PzKD2mnC2Hu5MYjyegJ9LnxKIUE86918+NIoesC 12TmanO+o6zaKPgJ12w/5J6j3u8jP/q0qWwS4sFQZSF625za5KPh8TX08xO1a7S/Vw kqDJXSKqv7BEAOz/af6+6AgWyqMgt8GOwBPnqWUY= Received: from blr-ubuntu-poza.qualcomm.com (blr-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.18.19]) (using TLSv1.1 with cipher ECDHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: poza@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id C69B160A26; Sat, 20 Jan 2018 06:35:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1516430153; bh=GU0zoHu1r8A4zUs3llbho9BWx2wlQVqtGuiWjzNEYqc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=J9oy3wE63E2NXOk26Hd3VWy0yikg3r2YJUWGOwBeG3osoTZCqPafbRyoJMtwcLLwE lYepfuNGsUF/aGzDSt33NMioOGOKl4c7i9qxbqme8m71F8gsBFBuaqAgBdpMlF9iNW 7838u6fG5rtcGj8SuUsxZ3jQqWvgs01Snc/pX83c= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org C69B160A26 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=poza@codeaurora.org From: Oza Pawandeep To: Bjorn Helgaas , Philippe Ombredanne , Thomas Gleixner , Greg Kroah-Hartman , Kate Stewart , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Dongdong Liu , Keith Busch , Wei Zhang , Sinan Kaya , Timur Tabi Cc: Oza Pawandeep Subject: [PATCH v7 6/7] PCI: Unify wait for link active into generic pci Date: Sat, 20 Jan 2018 12:05:18 +0530 Message-Id: <1516430119-3825-7-git-send-email-poza@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1516430119-3825-1-git-send-email-poza@codeaurora.org> References: <1516430119-3825-1-git-send-email-poza@codeaurora.org> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Clients such as pciehp, dpc are using pcie_wait_link_active, which waits till the link becomes active or inactive. Made generic function and moved it to drivers/pci/pci.c Signed-off-by: Oza Pawandeep diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index 7bab060..26afeff 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -245,25 +245,12 @@ bool pciehp_check_link_active(struct controller *ctrl) return ret; } -static void __pcie_wait_link_active(struct controller *ctrl, bool active) +static bool pcie_wait_link_active(struct controller *ctrl) { - int timeout = 1000; - - if (pciehp_check_link_active(ctrl) == active) - return; - while (timeout > 0) { - msleep(10); - timeout -= 10; - if (pciehp_check_link_active(ctrl) == active) - return; - } - ctrl_dbg(ctrl, "Data Link Layer Link Active not %s in 1000 msec\n", - active ? "set" : "cleared"); -} + struct pci_dev *pdev = ctrl_dev(ctrl); + bool active = true; -static void pcie_wait_link_active(struct controller *ctrl) -{ - __pcie_wait_link_active(ctrl, true); + return pci_wait_for_link(pdev, active); } static bool pci_bus_check_dev(struct pci_bus *bus, int devfn) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 4a7c686..5e7e588 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4079,6 +4079,41 @@ static int pci_pm_reset(struct pci_dev *dev, int probe) return 0; } +/** + * pci__wait_for_link - Wait for link till its active/inactive + * @dev: Bridge device + * @active: waiting for active or inactive ? + * + * Use this to wait till link becomes active or inactive. + */ + +bool pci_wait_for_link(struct pci_dev *pdev, bool active) +{ + int timeout = 1000; + bool ret; + u16 lnk_status; + + pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status); + ret = !!(lnk_status & PCI_EXP_LNKSTA_DLLLA); + + while ((ret != active) && (timeout > 0)) { + msleep(10); + timeout -= 10; + pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status); + ret = !!(lnk_status & PCI_EXP_LNKSTA_DLLLA); + } + + if (ret == active) + return true; + + dev_printk(KERN_DEBUG, &pdev->dev, + "Data Link Layer Link Active not %s in 1000 msec\n", + active ? "set" : "cleared"); + + return false; +} +EXPORT_SYMBOL(pci_wait_for_link); + void pci_reset_secondary_bus(struct pci_dev *dev) { u16 ctrl; diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c index b5c9fbd..7838b02 100644 --- a/drivers/pci/pcie/pcie-dpc.c +++ b/drivers/pci/pcie/pcie-dpc.c @@ -150,15 +150,9 @@ static void dpc_wait_link_inactive(struct dpc_dev *dpc) struct pci_dev *pdev = dpc->dev->port; struct device *dev = &dpc->dev->device; u16 lnk_status; + bool active = false; - pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status); - while (lnk_status & PCI_EXP_LNKSTA_DLLLA && - !time_after(jiffies, timeout)) { - msleep(10); - pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status); - } - if (lnk_status & PCI_EXP_LNKSTA_DLLLA) - dev_warn(dev, "Link state not disabled for DPC event\n"); + pci_wait_for_link(pdev, active); } /** diff --git a/include/linux/pci.h b/include/linux/pci.h index c170c92..f9f6a3d 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1201,6 +1201,7 @@ int pci_add_ext_cap_save_buffer(struct pci_dev *dev, int pci_request_selected_regions(struct pci_dev *, int, const char *); int pci_request_selected_regions_exclusive(struct pci_dev *, int, const char *); void pci_release_selected_regions(struct pci_dev *, int); +bool pci_wait_for_link(struct pci_dev *pdev, bool active); /* drivers/pci/bus.c */ struct pci_bus *pci_bus_get(struct pci_bus *bus);