From patchwork Tue Jun 20 09:49:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Maciej W. Rozycki" X-Patchwork-Id: 13285518 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E8781EB64DB for ; Tue, 20 Jun 2023 09:52:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232536AbjFTJwN (ORCPT ); Tue, 20 Jun 2023 05:52:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56796 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232008AbjFTJvm (ORCPT ); Tue, 20 Jun 2023 05:51:42 -0400 Received: from angie.orcam.me.uk (angie.orcam.me.uk [78.133.224.34]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 23446173C; Tue, 20 Jun 2023 02:49:36 -0700 (PDT) Received: by angie.orcam.me.uk (Postfix, from userid 500) id B820492009D; Tue, 20 Jun 2023 11:49:14 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by angie.orcam.me.uk (Postfix) with ESMTP id B145092009B; Tue, 20 Jun 2023 10:49:14 +0100 (BST) Date: Tue, 20 Jun 2023 10:49:14 +0100 (BST) From: "Maciej W. Rozycki" To: Bjorn Helgaas , Dennis Dalessandro , Jason Gunthorpe , Leon Romanovsky cc: linux-pci@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] PCI: Export pci_parent_bus_reset() for drivers to use In-Reply-To: Message-ID: References: User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Export pci_parent_bus_reset() so that drivers do not duplicate it. Document the interface. Signed-off-by: Maciej W. Rozycki --- drivers/pci/pci.c | 15 ++++++++++++++- include/linux/pci.h | 1 + 2 files changed, 15 insertions(+), 1 deletion(-) linux-pci-parent-bus-reset-export.diff Index: linux-macro/drivers/pci/pci.c =================================================================== --- linux-macro.orig/drivers/pci/pci.c +++ linux-macro/drivers/pci/pci.c @@ -5149,7 +5149,19 @@ int pci_bridge_secondary_bus_reset(struc } EXPORT_SYMBOL_GPL(pci_bridge_secondary_bus_reset); -static int pci_parent_bus_reset(struct pci_dev *dev, bool probe) +/** + * pci_parent_bus_reset - Reset a device via its upstream PCI bridge + * @dev: Device to reset. + * @probe: Only check if reset is possible if TRUE, actually reset if FALSE. + * + * Perform a device reset by requesting a secondary bus reset via the + * device's immediate upstream PCI bridge. Return 0 if successful or + * -ENOTTY if the reset failed or it could not have been issued in the + * first place because the device is not on a secondary bus of any PCI + * bridge or it wouldn't be the only device reset. If probing, then + * only verify whether it would be possible to issue a reset. + */ +int pci_parent_bus_reset(struct pci_dev *dev, bool probe) { struct pci_dev *pdev; @@ -5166,6 +5178,7 @@ static int pci_parent_bus_reset(struct p return pci_bridge_secondary_bus_reset(dev->bus->self); } +EXPORT_SYMBOL_GPL(pci_parent_bus_reset); static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, bool probe) { Index: linux-macro/include/linux/pci.h =================================================================== --- linux-macro.orig/include/linux/pci.h +++ linux-macro/include/linux/pci.h @@ -1447,6 +1447,7 @@ int devm_request_pci_bus_resources(struc /* Temporary until new and working PCI SBR API in place */ int pci_bridge_secondary_bus_reset(struct pci_dev *dev); +int pci_parent_bus_reset(struct pci_dev *dev, bool probe); #define __pci_bus_for_each_res0(bus, res, ...) \ for (unsigned int __b = 0; \