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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 D6094C5DF9D for ; Tue, 27 Oct 2020 00:15:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 86F4A21D42 for ; Tue, 27 Oct 2020 00:15:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603757749; bh=hCc5Rq+SScfioa4F8LCkHANwXjM39a2WqAGsRwyubqM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=iubnjnRC3UCL1QVIFI571ROhm9rPebu4C/n5r/2WOG8fjfaOskdsrEmFYvGapQpwR wpUoQm+uMjpmuE7TienOggXT3fwQpf1rM596hHZdZKOvjddemFAc1BjUyB0IsEeu4F lyn+Tlndnmhx4YeWnN+brH+UgWEDooknD+XitC6Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2411529AbgJ0AKa (ORCPT ); Mon, 26 Oct 2020 20:10:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:59386 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2439239AbgJ0AK2 (ORCPT ); Mon, 26 Oct 2020 20:10:28 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 28F4220882; Tue, 27 Oct 2020 00:10:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603757427; bh=hCc5Rq+SScfioa4F8LCkHANwXjM39a2WqAGsRwyubqM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dPcefh07MYbi9AptSeoa6N5XzjRp0JdswqfdzG9Vh2rbHgkto7uWwOGfPhfGNV7eB +fjb2pJAdKoVe4S9JJoAscE/76zX7KNosg8WvG5VEI8KJqGywQWhhMSgijcgBrPJ6j DAul7mZ7yKqSVo16rcdVKoobappgMhDn8zfz+nlk= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lorenzo Pieralisi , George Cherian , Catalin Marinas , Arnd Bergmann , Will Deacon , Bjorn Helgaas , Yang Yingliang , Sasha Levin , linux-arch@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 34/46] asm-generic/io.h: Fix !CONFIG_GENERIC_IOMAP pci_iounmap() implementation Date: Mon, 26 Oct 2020 20:09:33 -0400 Message-Id: <20201027000946.1026923-34-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201027000946.1026923-1-sashal@kernel.org> References: <20201027000946.1026923-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org From: Lorenzo Pieralisi [ Upstream commit f5810e5c329238b8553ebd98b914bdbefd8e6737 ] For arches that do not select CONFIG_GENERIC_IOMAP, the current pci_iounmap() function does nothing causing obvious memory leaks for mapped regions that are backed by MMIO physical space. In order to detect if a mapped pointer is IO vs MMIO, a check must made available to the pci_iounmap() function so that it can actually detect whether the pointer has to be unmapped. In configurations where CONFIG_HAS_IOPORT_MAP && !CONFIG_GENERIC_IOMAP, a mapped port is detected using an ioport_map() stub defined in asm-generic/io.h. Use the same logic to implement a stub (ie __pci_ioport_unmap()) that detects if the passed in pointer in pci_iounmap() is IO vs MMIO to iounmap conditionally and call it in pci_iounmap() fixing the issue. Leave __pci_ioport_unmap() as a NOP for all other config options. Tested-by: George Cherian Link: https://lore.kernel.org/lkml/20200905024811.74701-1-yangyingliang@huawei.com Link: https://lore.kernel.org/lkml/20200824132046.3114383-1-george.cherian@marvell.com Link: https://lore.kernel.org/r/a9daf8d8444d0ebd00bc6d64e336ec49dbb50784.1600254147.git.lorenzo.pieralisi@arm.com Reported-by: George Cherian Signed-off-by: Lorenzo Pieralisi Signed-off-by: Lorenzo Pieralisi Reviewed-by: Catalin Marinas Cc: Arnd Bergmann Cc: George Cherian Cc: Will Deacon Cc: Bjorn Helgaas Cc: Catalin Marinas Cc: Yang Yingliang Signed-off-by: Sasha Levin --- include/asm-generic/io.h | 39 +++++++++++++++++++++++++++------------ 1 file changed, 27 insertions(+), 12 deletions(-) diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h index b4531e3b21209..1eafea2bf3ac2 100644 --- a/include/asm-generic/io.h +++ b/include/asm-generic/io.h @@ -767,18 +767,6 @@ static inline void iowrite64_rep(volatile void __iomem *addr, #include #define __io_virt(x) ((void __force *)(x)) -#ifndef CONFIG_GENERIC_IOMAP -struct pci_dev; -extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max); - -#ifndef pci_iounmap -#define pci_iounmap pci_iounmap -static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p) -{ -} -#endif -#endif /* CONFIG_GENERIC_IOMAP */ - /* * Change virtual addresses to physical addresses and vv. * These are pretty trivial @@ -901,6 +889,16 @@ static inline void __iomem *ioport_map(unsigned long port, unsigned int nr) { return PCI_IOBASE + (port & IO_SPACE_LIMIT); } +#define __pci_ioport_unmap __pci_ioport_unmap +static inline void __pci_ioport_unmap(void __iomem *p) +{ + uintptr_t start = (uintptr_t) PCI_IOBASE; + uintptr_t addr = (uintptr_t) p; + + if (addr >= start && addr < start + IO_SPACE_LIMIT) + return; + iounmap(p); +} #endif #ifndef ioport_unmap @@ -915,6 +913,23 @@ extern void ioport_unmap(void __iomem *p); #endif /* CONFIG_GENERIC_IOMAP */ #endif /* CONFIG_HAS_IOPORT_MAP */ +#ifndef CONFIG_GENERIC_IOMAP +struct pci_dev; +extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max); + +#ifndef __pci_ioport_unmap +static inline void __pci_ioport_unmap(void __iomem *p) {} +#endif + +#ifndef pci_iounmap +#define pci_iounmap pci_iounmap +static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p) +{ + __pci_ioport_unmap(p); +} +#endif +#endif /* CONFIG_GENERIC_IOMAP */ + /* * Convert a virtual cached pointer to an uncached pointer */ -- 2.25.1