From nobody Sun Apr 12 05:50:50 2026 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 6A388C19F2A for ; Mon, 1 Aug 2022 14:41:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232948AbiHAOlD (ORCPT ); Mon, 1 Aug 2022 10:41:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53238 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232834AbiHAOky (ORCPT ); Mon, 1 Aug 2022 10:40:54 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 6FA003C8EA for ; Mon, 1 Aug 2022 07:40:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1659364850; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=uxopdcFQVMy5FY+0KKOo/rz2PC4Nm+RMZNyohtkWr+0=; b=IL//n9NmRS9v15e1pkuox96ULDTfv2BkSUK/flZJ9XzxKc6mAbFmgvANBCD/B7biAyMVum 8uYV2CrOP0AiXjnYa339oBE5efWM3mk8TrZQjulrwfHQ0ljzZoCSaTK7FqIZLOzMNKLIsl 8hC/LsapVndPqGumfRFqu8dm0aOjvZs= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-381-LeGhaKzCMLSYNGV72SviRQ-1; Mon, 01 Aug 2022 10:40:47 -0400 X-MC-Unique: LeGhaKzCMLSYNGV72SviRQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8C2C618E6C4B; Mon, 1 Aug 2022 14:40:46 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (ovpn-12-103.pek2.redhat.com [10.72.12.103]) by smtp.corp.redhat.com (Postfix) with ESMTP id ED2B51415116; Mon, 1 Aug 2022 14:40:42 +0000 (UTC) From: Baoquan He To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, akpm@linux-foundation.org, hch@infradead.org, wangkefeng.wang@huawei.com, linux-arm-kernel@lists.infradead.org, Baoquan He Subject: [PATCH 02/11] mm: ioremap: fixup the physical address Date: Mon, 1 Aug 2022 22:40:20 +0800 Message-Id: <20220801144029.57829-3-bhe@redhat.com> In-Reply-To: <20220801144029.57829-1-bhe@redhat.com> References: <20220801144029.57829-1-bhe@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.85 on 10.11.54.7 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" In some architectures, the io address will be fixed up before doing mapping, e.g, parisc, mips. In oder to convert them to take GENERIC_IOREMAP method, we need wrap the address fixing up code into ioremap_allowed() and pass the new address out for ioremap_prot() handling. This is a preparation patch, no functionality change. Signed-off-by: Baoquan He --- arch/arm64/include/asm/io.h | 3 ++- arch/arm64/mm/ioremap.c | 10 ++++++++-- include/asm-generic/io.h | 6 +++--- mm/ioremap.c | 19 ++++++++++--------- 4 files changed, 23 insertions(+), 15 deletions(-) diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h index 9c56a077b687..7f0c5f60d946 100644 --- a/arch/arm64/include/asm/io.h +++ b/arch/arm64/include/asm/io.h @@ -164,7 +164,8 @@ extern void __memset_io(volatile void __iomem *, int, s= ize_t); * I/O memory mapping functions. */ =20 -void __iomem *ioremap_allowed(phys_addr_t phys_addr, size_t size, unsigned= long prot); +void __iomem * +ioremap_allowed(phys_addr_t *paddr, size_t size, unsigned long *prot_val); #define ioremap_allowed ioremap_allowed =20 #define _PAGE_IOREMAP PROT_DEVICE_nGnRE diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c index 49467c781283..b9febcf0f5f4 100644 --- a/arch/arm64/mm/ioremap.c +++ b/arch/arm64/mm/ioremap.c @@ -3,11 +3,17 @@ #include #include =20 -void __iomem *ioremap_allowed(phys_addr_t phys_addr, size_t size, unsigned= long prot) +void __iomem * +ioremap_allowed(phys_addr_t *paddr, size_t size, unsigned long *prot_val) { - unsigned long last_addr =3D phys_addr + size - 1; + unsigned long last_addr, offset, phys_addr =3D *paddr; int ret =3D -EINVAL; =20 + offset =3D phys_addr & (~PAGE_MASK); + phys_addr -=3D offset; + size =3D PAGE_ALIGN(size + offset); + last_addr =3D phys_addr + size - 1; + /* Don't allow outside PHYS_MASK */ if (last_addr & ~PHYS_MASK) return IOMEM_ERR_PTR(ret); diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h index d72eb310fb3c..0b5cd3cef99d 100644 --- a/include/asm-generic/io.h +++ b/include/asm-generic/io.h @@ -976,8 +976,8 @@ static inline void iounmap(volatile void __iomem *addr) */ #ifndef ioremap_allowed #define ioremap_allowed ioremap_allowed -static inline void __iomem *ioremap_allowed(phys_addr_t phys_addr, size_t = size, - unsigned long prot) +static inline void __iomem *ioremap_allowed(phys_addr_t *paddr, size_t siz= e, + unsigned long *prot_val) { return NULL; } @@ -991,7 +991,7 @@ static inline int iounmap_allowed(void *addr) } #endif =20 -void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size, +void __iomem *ioremap_prot(phys_addr_t paddr, size_t size, unsigned long prot); void iounmap(volatile void __iomem *addr); =20 diff --git a/mm/ioremap.c b/mm/ioremap.c index b16ee9debea2..01439882112e 100644 --- a/mm/ioremap.c +++ b/mm/ioremap.c @@ -11,13 +11,20 @@ #include #include =20 -void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size, +void __iomem *ioremap_prot(phys_addr_t paddr, size_t size, unsigned long prot) { unsigned long offset, vaddr; - phys_addr_t last_addr; + phys_addr_t last_addr, phys_addr =3D paddr; struct vm_struct *area; void __iomem *base; + unsigned long prot_val =3D prot; + + base =3D ioremap_allowed(&phys_addr, size, &prot_val); + if (IS_ERR(base)) + return NULL; + else if (base) + return base; =20 /* Disallow wrap-around or zero size */ last_addr =3D phys_addr + size - 1; @@ -29,12 +36,6 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t= size, phys_addr -=3D offset; size =3D PAGE_ALIGN(size + offset); =20 - base =3D ioremap_allowed(phys_addr, size, prot); - if (IS_ERR(base)) - return NULL; - else if (base) - return base; - area =3D get_vm_area_caller(size, VM_IOREMAP, __builtin_return_address(0)); if (!area) @@ -43,7 +44,7 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t = size, area->phys_addr =3D phys_addr; =20 if (ioremap_page_range(vaddr, vaddr + size, phys_addr, - __pgprot(prot))) { + __pgprot(prot_val))) { free_vm_area(area); return NULL; } --=20 2.34.1