From patchwork Thu Jun 28 19:31:02 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sinan Kaya X-Patchwork-Id: 10494943 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 8927C60325 for ; Thu, 28 Jun 2018 19:32:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 89F9D29B32 for ; Thu, 28 Jun 2018 19:32:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7DE0029B45; Thu, 28 Jun 2018 19:32:46 +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=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=unavailable 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 0D7D829B32 for ; Thu, 28 Jun 2018 19:32:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935310AbeF1Tbm (ORCPT ); Thu, 28 Jun 2018 15:31:42 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:53994 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934767AbeF1Tbi (ORCPT ); Thu, 28 Jun 2018 15:31:38 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id E174160BDE; Thu, 28 Jun 2018 19:31:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1530214298; bh=70YTMwOXjJ7Om4BvuSAGg1BL+Eq8mHIGNY7xUeGWgVs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cFNQ13xCD2zcqS2gI9m8gCSIZ7BbrcKyAbQOOx0YgA+sXQAL2t9QpDgBhslLAzAgp 5MzxPAcZFfuEPXiLTn9tjeRDcQ3YWbYcY9Xf5XulKxzECTnGmC2sRKbpgr6yDc+hNm XDZ2rjsB6kUaMWyLjd1PVpPwpweatj+dPmhU05qw= Received: from drakthul.qualcomm.com (global_nat1_iad_fw.qualcomm.com [129.46.232.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: okaya@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 349D560B26; Thu, 28 Jun 2018 19:31:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1530214295; bh=70YTMwOXjJ7Om4BvuSAGg1BL+Eq8mHIGNY7xUeGWgVs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RG5RymkYBe/KM1u8TlAJEH7IEFGycaQRMEEsqn8K68KbZeAIGZXMSG4DCWZcaWp3y +4Zid2YKnBD/NfT1IVDC4gA86JZi/yZ+XzkBuDLkUOpqnHR3KIrEhBaN1U67BP4ji5 KrP+TL/igthAx5XWRTv/66rROWCNb/2JMo1vFgNk= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 349D560B26 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=okaya@codeaurora.org From: Sinan Kaya To: linux-pci@vger.kernel.org Cc: linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Sinan Kaya , Mike Marciniszyn , Dennis Dalessandro , Doug Ledford , Jason Gunthorpe , Bjorn Helgaas , Alex Williamson , Alexey Kardashevskiy , Peter Xu , Zhenyu Wang , linux-rdma@vger.kernel.org (open list:HFI1 DRIVER), linux-kernel@vger.kernel.org (open list), kvm@vger.kernel.org (open list:VFIO DRIVER) Subject: [PATCH V4 4/7] PCI: Unify try slot and bus reset API Date: Thu, 28 Jun 2018 15:31:02 -0400 Message-Id: <1530214274-21139-4-git-send-email-okaya@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1530214274-21139-1-git-send-email-okaya@codeaurora.org> References: <1530214274-21139-1-git-send-email-okaya@codeaurora.org> MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Drivers are expected to call pci_try_reset_slot() or pci_try_reset_bus() by querying if a system supports hotplug or not. A survey showed that most drivers don't do this and we are leaking hotplug capability to the user. Hide pci_try_slot_reset() from drivers and embed into pci_try_bus_reset(). Change pci_try_reset_bus() parameter from struct pci_bus to struct pci_dev. Signed-off-by: Sinan Kaya --- drivers/infiniband/hw/hfi1/pcie.c | 2 +- drivers/pci/pci.c | 26 +++++++++++++++++++++----- drivers/vfio/pci/vfio_pci.c | 6 ++---- include/linux/pci.h | 3 +-- 4 files changed, 25 insertions(+), 12 deletions(-) diff --git a/drivers/infiniband/hw/hfi1/pcie.c b/drivers/infiniband/hw/hfi1/pcie.c index 4570c4d..df4f2d3 100644 --- a/drivers/infiniband/hw/hfi1/pcie.c +++ b/drivers/infiniband/hw/hfi1/pcie.c @@ -905,7 +905,7 @@ static int trigger_sbr(struct hfi1_devdata *dd) * delay after a reset is required. Per spec requirements, * the link is either working or not after that point. */ - return pci_try_reset_bus(dev->bus); + return pci_try_reset_bus(dev); } /* diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 236220c..79a1566 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4817,12 +4817,12 @@ int pci_reset_slot(struct pci_slot *slot) EXPORT_SYMBOL_GPL(pci_reset_slot); /** - * pci_try_reset_slot - Try to reset a PCI slot + * __pci_try_reset_slot - Try to reset a PCI slot * @slot: PCI slot to reset * * Same as above except return -EAGAIN if the slot cannot be locked */ -int pci_try_reset_slot(struct pci_slot *slot) +static int __pci_try_reset_slot(struct pci_slot *slot) { int rc; @@ -4843,7 +4843,6 @@ int pci_try_reset_slot(struct pci_slot *slot) return rc; } -EXPORT_SYMBOL_GPL(pci_try_reset_slot); static int pci_bus_reset(struct pci_bus *bus, int probe) { @@ -4906,12 +4905,12 @@ int pci_reset_bus(struct pci_bus *bus) EXPORT_SYMBOL_GPL(pci_reset_bus); /** - * pci_try_reset_bus - Try to reset a PCI bus + * __pci_try_reset_bus - Try to reset a PCI bus * @bus: top level PCI bus to reset * * Same as above except return -EAGAIN if the bus cannot be locked */ -int pci_try_reset_bus(struct pci_bus *bus) +static int __pci_try_reset_bus(struct pci_bus *bus) { int rc; @@ -4932,6 +4931,23 @@ int pci_try_reset_bus(struct pci_bus *bus) return rc; } + +/** + * pci_try_reset_bus - Try to reset a PCI bus + * @pdev: top level PCI device to reset via slot/bus + * + * Same as above except return -EAGAIN if the bus cannot be locked + */ +int pci_try_reset_bus(struct pci_dev *pdev) +{ + bool slot = false; + + if (!pci_probe_reset_slot(pdev->slot)) + slot = true; + + return slot ? __pci_try_reset_slot(pdev->slot) : + __pci_try_reset_bus(pdev->bus); +} EXPORT_SYMBOL_GPL(pci_try_reset_bus); /** diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index b423a30..71018ec 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -1010,8 +1010,7 @@ static long vfio_pci_ioctl(void *device_data, &info, slot); if (!ret) /* User has access, do the reset */ - ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : - pci_try_reset_bus(vdev->pdev->bus); + ret = pci_try_reset_bus(vdev->pdev); hot_reset_release: for (i--; i >= 0; i--) @@ -1373,8 +1372,7 @@ static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev) } if (needs_reset) - ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : - pci_try_reset_bus(vdev->pdev->bus); + ret = pci_try_reset_bus(vdev->pdev); put_devs: for (i = 0; i < devs.cur_index; i++) { diff --git a/include/linux/pci.h b/include/linux/pci.h index 6b12ce2..f5c85b6 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1096,10 +1096,9 @@ int pci_reset_function_locked(struct pci_dev *dev); int pci_try_reset_function(struct pci_dev *dev); int pci_probe_reset_slot(struct pci_slot *slot); int pci_reset_slot(struct pci_slot *slot); -int pci_try_reset_slot(struct pci_slot *slot); int pci_probe_reset_bus(struct pci_bus *bus); int pci_reset_bus(struct pci_bus *bus); -int pci_try_reset_bus(struct pci_bus *bus); +int pci_try_reset_bus(struct pci_dev *dev); void pci_reset_secondary_bus(struct pci_dev *dev); void pcibios_reset_secondary_bus(struct pci_dev *dev); void pci_update_resource(struct pci_dev *dev, int resno);