From patchwork Mon Sep 20 06:41:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kishon Vijay Abraham I X-Patchwork-Id: 12504631 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 X-Spam-Level: X-Spam-Status: No, score=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E95AC433EF for ; Mon, 20 Sep 2021 06:42:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1788A60F93 for ; Mon, 20 Sep 2021 06:42:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233362AbhITGn2 (ORCPT ); Mon, 20 Sep 2021 02:43:28 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:48778 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233409AbhITGn1 (ORCPT ); Mon, 20 Sep 2021 02:43:27 -0400 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 18K6fjjs073480; Mon, 20 Sep 2021 01:41:45 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1632120105; bh=irwwhPCzZ2l+G6tBT9VTTRVLR5kG5CHiPJsvsZ/kQQg=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=fvKpEbKaHeIpTobTTWtNB6jtG/15gld1qmcOrb242Jd7LAHjhKZzfCutKrPj8HtUI PAiMDe2AfEyBk4H3VkssyoZ8AE0O6drNVTEVdVh1BjKZwi2RKO4PazeqMW8z+2HT5g IO0iBCZISgG1OrLYYiSuzAhIPSPZiG/Y/A06h+Ok= Received: from DFLE100.ent.ti.com (dfle100.ent.ti.com [10.64.6.21]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 18K6fjbj064810 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 20 Sep 2021 01:41:45 -0500 Received: from DFLE107.ent.ti.com (10.64.6.28) by DFLE100.ent.ti.com (10.64.6.21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14; Mon, 20 Sep 2021 01:41:45 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DFLE107.ent.ti.com (10.64.6.28) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14 via Frontend Transport; Mon, 20 Sep 2021 01:41:45 -0500 Received: from a0393678-lt.ent.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 18K6fYa7015912; Mon, 20 Sep 2021 01:41:42 -0500 From: Kishon Vijay Abraham I To: Thomas Gleixner , Marc Zyngier , Bjorn Helgaas CC: , , Lorenzo Pieralisi , Kishon Vijay Abraham I , Subject: [PATCH 2/3] PCI: Export find_pci_root_bus() Date: Mon, 20 Sep 2021 12:11:32 +0530 Message-ID: <20210920064133.14115-3-kishon@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210920064133.14115-1-kishon@ti.com> References: <20210920064133.14115-1-kishon@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Export find_pci_root_bus() in order for other subsystems (like IRQCHIP) to find the root bus of a particual PCIe device. This is done in preparation for GIC ITS to walk the PCIe bus for calculating the total number of interrupt vectors that has to be supported by a specific GIC ITS device ID, specifically when "msi-map-mask" is populated in device tree. Signed-off-by: Kishon Vijay Abraham I --- drivers/pci/host-bridge.c | 3 ++- include/linux/pci.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c index afa50b446567..4ec34d040c02 100644 --- a/drivers/pci/host-bridge.c +++ b/drivers/pci/host-bridge.c @@ -9,13 +9,14 @@ #include "pci.h" -static struct pci_bus *find_pci_root_bus(struct pci_bus *bus) +struct pci_bus *find_pci_root_bus(struct pci_bus *bus) { while (bus->parent) bus = bus->parent; return bus; } +EXPORT_SYMBOL_GPL(find_pci_root_bus); struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus) { diff --git a/include/linux/pci.h b/include/linux/pci.h index 8500fec56e50..b33ef3e08a2f 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1475,6 +1475,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, void __pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), void *userdata, u32 rid, u32 mask); +struct pci_bus *find_pci_root_bus(struct pci_bus *bus); int pci_cfg_space_size(struct pci_dev *dev); unsigned char pci_bus_max_busnr(struct pci_bus *bus); void pci_setup_bridge(struct pci_bus *bus);