From mboxrd@z Thu Jan 1 00:00:00 1970 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=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 AF114C4363A for ; Tue, 27 Oct 2020 09:13:13 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 376AF20735 for ; Tue, 27 Oct 2020 09:13:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 376AF20735 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ozlabs.ru Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4CL5b949w2zDqRx for ; Tue, 27 Oct 2020 20:13:09 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.ru (client-ip=107.174.27.60; helo=ozlabs.ru; envelope-from=aik@ozlabs.ru; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ozlabs.ru Received: from ozlabs.ru (ozlabs.ru [107.174.27.60]) by lists.ozlabs.org (Postfix) with ESMTP id 4CL5TC1Vf0zDqMy for ; Tue, 27 Oct 2020 20:07:59 +1100 (AEDT) Received: from fstn1-p1.ozlabs.ibm.com (localhost [IPv6:::1]) by ozlabs.ru (Postfix) with ESMTP id D4AB2AE80274; Tue, 27 Oct 2020 05:06:42 -0400 (EDT) From: Alexey Kardashevskiy To: linuxppc-dev@lists.ozlabs.org Subject: [RFC PATCH kernel 2/2] powerpc/pci: Remove LSI mappings on device teardown Date: Tue, 27 Oct 2020 20:06:55 +1100 Message-Id: <20201027090655.14118-3-aik@ozlabs.ru> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201027090655.14118-1-aik@ozlabs.ru> References: <20201027090655.14118-1-aik@ozlabs.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Herring , Alexey Kardashevskiy , Marc Zyngier , linux-kernel@vger.kernel.org, Qian Cai , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Frederic Barrat , Oliver O'Halloran , Thomas Gleixner , =?UTF-8?q?Michal=20Such=C3=A1nek?= Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Oliver O'Halloran When a passthrough IO adapter is removed from a pseries machine using hash MMU and the XIVE interrupt mode, the POWER hypervisor expects the guest OS to clear all page table entries related to the adapter. If some are still present, the RTAS call which isolates the PCI slot returns error 9001 "valid outstanding translations" and the removal of the IO adapter fails. This is because when the PHBs are scanned, Linux maps automatically the INTx interrupts in the Linux interrupt number space but these are never removed. This problem can be fixed by adding the corresponding unmap operation when the device is removed. There's no pcibios_* hook for the remove case, but the same effect can be achieved using a bus notifier. Cc: Cédric Le Goater Cc: Michael Ellerman Signed-off-by: Oliver O'Halloran Signed-off-by: Alexey Kardashevskiy --- arch/powerpc/kernel/pci-common.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c index be108616a721..95f4e173368a 100644 --- a/arch/powerpc/kernel/pci-common.c +++ b/arch/powerpc/kernel/pci-common.c @@ -404,6 +404,27 @@ static int pci_read_irq_line(struct pci_dev *pci_dev) return 0; } +static int ppc_pci_unmap_irq_line(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct pci_dev *pdev = to_pci_dev(data); + + if (action == BUS_NOTIFY_DEL_DEVICE) + irq_dispose_mapping(pdev->irq); + + return NOTIFY_DONE; +} + +static struct notifier_block ppc_pci_unmap_irq_notifier = { + .notifier_call = ppc_pci_unmap_irq_line, +}; + +static int ppc_pci_register_irq_notifier(void) +{ + return bus_register_notifier(&pci_bus_type, &ppc_pci_unmap_irq_notifier); +} +arch_initcall(ppc_pci_register_irq_notifier); + /* * Platform support for /proc/bus/pci/X/Y mmap()s. * -- paulus. -- 2.17.1