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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0991ECAC598 for ; Tue, 16 Sep 2025 17:19:41 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5FC108E000A; Tue, 16 Sep 2025 13:19:40 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5ACB08E0001; Tue, 16 Sep 2025 13:19:40 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 44E3D8E000A; Tue, 16 Sep 2025 13:19:40 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 2FBCB8E0001 for ; Tue, 16 Sep 2025 13:19:40 -0400 (EDT) Received: from smtpin20.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id D08F38569B for ; Tue, 16 Sep 2025 17:19:39 +0000 (UTC) X-FDA: 83895775278.20.01DF99C Received: from CH1PR05CU001.outbound.protection.outlook.com (mail-northcentralusazon11010060.outbound.protection.outlook.com [52.101.193.60]) by imf08.hostedemail.com (Postfix) with ESMTP id EDF08160005 for ; Tue, 16 Sep 2025 17:19:36 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=cOwLbzLy; spf=pass (imf08.hostedemail.com: domain of jgg@nvidia.com designates 52.101.193.60 as permitted sender) smtp.mailfrom=jgg@nvidia.com; arc=pass ("microsoft.com:s=arcselector10001:i=1"); dmarc=pass (policy=reject) header.from=nvidia.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1758043177; h=from:from:sender: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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=ItVKPLLwvprRNFT6X7VAsBvihdfCxXFF9VCA4y3l4f0=; b=w348JnZZOUmKylkqflwct6m1+wBFOsbraaFGZV315Uz0N/aSC+hxkU0M7R4lq1YsPgq30n aX20uk1R0+hkpLULBLvnMvU03j6jtTSqjHZtDwC13N8cELQm+zu2vJ7bJVDL2EN7Gt1QgH 43lR2x72FMl45uvnY3LD60Q1+G+mIK4= ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1758043177; a=rsa-sha256; cv=pass; b=AP+nCauNM6+8ftHhL0DOAsBBADLg1LKjNkZNBaFASRbZwyYJWlZnqZT2a34SH4AjzTKi5S NKh6GiJFGnetkXeyQ7DY8bN558RafePiSnFdhkUMWSOGFQz0vVaC8iBT0x0xrIaSlqnlKE nXz9rdX5gez7mkVL+6wJsC4aIZK6q4Y= ARC-Authentication-Results: i=2; imf08.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=cOwLbzLy; spf=pass (imf08.hostedemail.com: domain of jgg@nvidia.com designates 52.101.193.60 as permitted sender) smtp.mailfrom=jgg@nvidia.com; arc=pass ("microsoft.com:s=arcselector10001:i=1"); dmarc=pass (policy=reject) header.from=nvidia.com ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=baSuvDaQ2ylCrkHKkizEF6YSOnKO3Pqk8tJzdh02lSy/NQ+wERIy3K7yq4rZepdxkn6GPefbrjr1gXJSZVPxEOb6ppb79G6jnwMANSJ6BEbR320R1T+XPOZaSYB/i/59rSnTTS74WevapLytqDY0l99m0ASADQzsRUeNXIqwTl4KIgDj01sUdEp6E9HfWZbSp/jurSrENOxQDO+pA4O5/+bTV69QGwGtGDMn8HsuDBBVIZodYcegYUgLW6zVgfOgdz91wIeGB5HYtmBOq1C5pMgNzoe0Bi8Z+SJT1VSJvEFadqsqjlXIqNFDbYUEsG2CWibS9J7b69MtwInebu7Yhw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=ItVKPLLwvprRNFT6X7VAsBvihdfCxXFF9VCA4y3l4f0=; b=v2syJOjmtdwzii2SW5wAzlm+1rY7WyiBUiVwx4t/Tfy2P4qFz4p+Gvm5MbK8xWByj4UtZruJwghb902kM8Z0rJCdu+D9vU15eC+3ULfP5GeTZDkWo7mWL2o+Ro8wwHbrbCPgClMuzJRcazicgNkN3af1ebFYlrxKM/gP4tsrqgOLpauDIcp2UESVivsgv/+lnuoe61CIIQ9R/tss6rTO6YhbZ2NlNl1DAbkTK2A53tiC3JI8cudr+7XSCvnGirohdHkjgmsT/KFPIPAVUmh1eMjUdD0cuj6TCqz22hwjFu6l/MiXsgSBVJX5msYxO2edF4DETSEiWfrnFlgiCwjo0A== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ItVKPLLwvprRNFT6X7VAsBvihdfCxXFF9VCA4y3l4f0=; b=cOwLbzLyhDwy6AigXL3yFMBe3XYpK3fd2XgkyQH44v3l1EKN+a45x5WFgREf17SyRujxuV5WGrTP+AokHXbZWAb3aO5zWWd5p0QEi8PLc6SAJ0lpMhKIUQNxkZkskKHWyrY3NAO1jYVNiWBnvz3uPm2gM4xdVGkIgxc6SLp3xizqLaITWMMDNttOGmbgybnIK8i2VnPW84HIwU78MBCQzwzph7UToyI6o9+PxT8N89rnLBY0RIklBHWqP8kJUtaNRw/N3wEX75Nx42aDTXi3xx94vNdVJcyiIZXv+FwUJyVdR++k22dEbu7imZWfd6SrsvYXA8PJIVs9j5AdtickbA== Received: from PH7PR12MB5757.namprd12.prod.outlook.com (2603:10b6:510:1d0::13) by MW6PR12MB8900.namprd12.prod.outlook.com (2603:10b6:303:244::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9094.22; Tue, 16 Sep 2025 17:19:32 +0000 Received: from PH7PR12MB5757.namprd12.prod.outlook.com ([fe80::f012:300c:6bf4:7632]) by PH7PR12MB5757.namprd12.prod.outlook.com ([fe80::f012:300c:6bf4:7632%2]) with mapi id 15.20.9115.022; Tue, 16 Sep 2025 17:19:32 +0000 Date: Tue, 16 Sep 2025 14:19:30 -0300 From: Jason Gunthorpe To: Lorenzo Stoakes Cc: Andrew Morton , Jonathan Corbet , Matthew Wilcox , Guo Ren , Thomas Bogendoerfer , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , "David S . Miller" , Andreas Larsson , Arnd Bergmann , Greg Kroah-Hartman , Dan Williams , Vishal Verma , Dave Jiang , Nicolas Pitre , Muchun Song , Oscar Salvador , David Hildenbrand , Konstantin Komarov , Baoquan He , Vivek Goyal , Dave Young , Tony Luck , Reinette Chatre , Dave Martin , James Morse , Alexander Viro , Christian Brauner , Jan Kara , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Hugh Dickins , Baolin Wang , Uladzislau Rezki , Dmitry Vyukov , Andrey Konovalov , Jann Horn , Pedro Falcato , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-csky@vger.kernel.org, linux-mips@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-mm@kvack.org, ntfs3@lists.linux.dev, kexec@lists.infradead.org, kasan-dev@googlegroups.com, iommu@lists.linux.dev, Kevin Tian , Will Deacon , Robin Murphy Subject: Re: [PATCH v3 07/13] mm: introduce io_remap_pfn_range_[prepare, complete]() Message-ID: <20250916171930.GP1086830@nvidia.com> References: <3d8f72ece78c1b470382b6a1f12eef0eacd4c068.1758031792.git.lorenzo.stoakes@oracle.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3d8f72ece78c1b470382b6a1f12eef0eacd4c068.1758031792.git.lorenzo.stoakes@oracle.com> X-ClientProxiedBy: SA1P222CA0108.NAMP222.PROD.OUTLOOK.COM (2603:10b6:806:3c5::29) To PH7PR12MB5757.namprd12.prod.outlook.com (2603:10b6:510:1d0::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH7PR12MB5757:EE_|MW6PR12MB8900:EE_ X-MS-Office365-Filtering-Correlation-Id: 341fc7f3-738b-44df-f13b-08ddf5453383 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|7416014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?Vl4N23yHSqL+EMYITX/5wxgcMBlb101tXwqHSvX1Nrj1+UJ86bWRvRyWZi97?= =?us-ascii?Q?4aDaQDAckt0xzvg/pnEA0L4xfyRH9pKyVhAdep6gp9Etjvho+S0uOL/Ueod4?= =?us-ascii?Q?l8GCHY8nh/p/odFodZlqU9CvPHfxom4zNbZCdqzXRwzxqvGhsdYiU7td8II7?= =?us-ascii?Q?gQJkRywrOuRJzMkyb0Nn6akE+z6Yt9iyIeFUk8rtyL8NXR2mQaEcxBjDZx6p?= =?us-ascii?Q?nu0pECMpyFFvp52GRPbs6s71w5TCLtZUV4Pyce67L89kHDU9S+LSICtTijeH?= =?us-ascii?Q?n236R3+ZllgrVSg8TH8rSlVY6sLvs5f//OBkFgsRiGFbHYrZp4Fi399movEO?= =?us-ascii?Q?Slg4dmL9r6J7ivLBtZE56TAtKgD65wPssa+blGBP0/C7vmeewWhuU88zHx1w?= =?us-ascii?Q?rwRBW6yjGV99OOPlkFJJvT9G1mb4B8gL9kodCW8TYybevEAD9T9+qnQZ3MXA?= =?us-ascii?Q?2KeA08uimOIknR2Os1tMMr6wUtdtfCAViAou4nTxXMKF9i8HO1aYVb2NagEG?= =?us-ascii?Q?qFB4751J+ZsMnITBVGt8/zBa9BU3mjbke3NGaiaJFv05kk+tJN5HRCD9cWuK?= =?us-ascii?Q?Bpi9zO9vYmyT/unFemMnk0RZC4/IdGafyfWr354d0qEK7ps147cLF1rrBmSN?= =?us-ascii?Q?Lxh+Yv1z9+QKD/KRkGQsQrmbHWclN/SjnSDth9tyfwY0U9ob0ZTwmDZCDFBA?= =?us-ascii?Q?EwXp7REhQ2FuEMUiESSXffaYIgRLSOrI8NUS+smvPLajuOxSZX3Eo7RmPI7F?= =?us-ascii?Q?gxFOkg7WI/LgdriTHfi3is2ggJvE1kUV1dSF5K/0N5iwEfgCxec5RLy1Q6Xs?= =?us-ascii?Q?blPz+y5aLy9VA7VZVL2/vth3f5cA3XI9gdxYPjsRohbK4VHmBvxujN6JmTUD?= =?us-ascii?Q?Aq9aWNnJt0M4o+cse7wa+5G2rgt05I2/qUdGhka3IRly7TQGMSHycu7yX7pD?= =?us-ascii?Q?l++J6YGzSDCDzbhOJUA4ZrOB3gWbEqi+Hu/s8QFUjdIrg2zyKk2WwT1UPL9m?= =?us-ascii?Q?PDiLxtTVncgc6f1iTKvLw8Y9Kjbum+fQ5nV5jdnBt9wjBw+ztcRoJpqULl+A?= =?us-ascii?Q?LrDI7yVlMv0UU3b4suMX1NSfn/Aw7RV4rWRqzGW6Qu4Kj3h9vbenqGGAsZsq?= =?us-ascii?Q?0QDD/pT3C/kLdRwMy8c1kZ0azCMdYvJ5zNY+vn3ke8m5tYwHMIYaxPficH2f?= =?us-ascii?Q?p/E9JtqqjVrAW6gKMaJbOpurvRBKsNpKGrESev/ARBgpkHn8sxjuL5pOaDq8?= =?us-ascii?Q?AtWI2BVjgyKbdJyBCZYtC7jB2K0UcGtXx3Ukx0qpTIzJK52CpOI6Aw+QaSS7?= =?us-ascii?Q?UsalmDJ58w5f+Gbhn+zfkmXUXtyU0IKxzaEXSsqN5jZ4QbgwxwsWNoJxP8E8?= =?us-ascii?Q?8T/tf1iDCyvFLMjxZ3VZuHV1J9zgH9X4fXxPraGNesIi4sjqd+KWsxg9SiUC?= =?us-ascii?Q?RNqaEY0eG2M=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PH7PR12MB5757.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(366016)(376014)(7416014);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?AhwdEjg3CH98NPMwNrq81fS5VJ/FD+TIBa+jyUvBQ/8W5qkcRF0Opo6yy2BR?= =?us-ascii?Q?ZB5IIt/4Yd5JrkXHQHnDOV7oAA2VKBoGWC5bVgihffsfh8z2f0ROYF07ivZP?= =?us-ascii?Q?3hx2dy3cBDT5Av+sOMvESByR/9/oV7DywGArpes5AMdzy/619g+VWbwTktan?= =?us-ascii?Q?aT9DMqwLjlKCXr04SQAqBoBWItfVP7wjrn2fCOIa/XPIUufaz8+QsBE248Jy?= =?us-ascii?Q?EVaftuOPijwlnyrq7mVw90wtDmJojgUZwFKzCXEVnG/HkuI0qdb/ak2lEJPF?= =?us-ascii?Q?roiIAteoeVmCv9rEQXUNcTX81SrF1lGhgOejDhCom+BhNMANb8FMpTH0ixvB?= =?us-ascii?Q?QTcpbAQzKuHel2TCYd7drfhLv3CYaYvx7BHkGeO6qXrfXw2xOddHan1lQ4tB?= =?us-ascii?Q?fjQnBtzkIOa3IpSlvDgjn4Utr0hlJMuLmGHJPZv6+dq0qYR7JC4t8VPOxr6T?= =?us-ascii?Q?mms9q/k1HKC3m6oRj9cznzrJCJRo+78AZKslDQ4WPAZNXHcOmUWWwAvffarV?= =?us-ascii?Q?D0wEVgeKg4CYq/xcuq5lat3lza2xrApCjnD1g3mYeraJ86uQIc16Px8v91rb?= =?us-ascii?Q?iPGcvDeycPdvttntwZlyTyW98R3XqteIkBbltnqYSr5iYOT5B6jfqEiXX7sp?= =?us-ascii?Q?KAIofZe34u5h3lSpAXqhvoCT2nlQffsv+lwObsfWmxLGW91QZwXfudYmHxXc?= =?us-ascii?Q?mUzIeCFbESPH1HmFqN6AXg8HCL6qkTMerzYMVuhZDj58zgx/rcbUDBu18095?= =?us-ascii?Q?1O1cErQrnPi9ZtmIOFbefnvuTWPX65wt0HJrzEnOzmC1omSrF5Dh0Q5mlik4?= =?us-ascii?Q?fGROhDaqH0VxNl2IV4qPczxcwJzvG+vYlbGDojr5X0ECOGw+HWvhwRlNFp4t?= =?us-ascii?Q?5p3ywYkzsN2cbrNSp6cEFvco1xpuUae34qXvSOX5rQQV10RoEZ7NI0M7VXdg?= =?us-ascii?Q?CyR71cqiAnjT6eZQ6oW6KewoVJbjvrQNKluIglALj1kl67hIwJHgRXLvBr/Y?= =?us-ascii?Q?NRB0GUZsej9HAgoejz9WJ+M3yg0DRRMjduhr4AsMeTUNLDr3wTWzS9ppogl9?= =?us-ascii?Q?ieNHrlC+EW9+5wP7Jbu5fJyyNh84qflUltAqsPOv3QxgPrW/lR1pr2rEEXHn?= =?us-ascii?Q?Zy2+neRkJsJI8SibWnTenMm5YmNSaoLq7f2uPVSDrgFexE+NTRxc9MP5hghR?= =?us-ascii?Q?Rr86kppon3ONCuT+C+Q3G9ekSRToyy7illnDfqrXHyCjgQvwfiD4rOTHfuuF?= =?us-ascii?Q?vcC7dkdhPXxfiGvwAuHDNEm/D1Mglg5wHH3qjnm1RzRRaFbwIzsEhCx2ZIkS?= =?us-ascii?Q?9d5RoYvbK4ajNSOeovHsyLQDyOf3LP4e2uXBx70Ej+OFHmbkDBiRl3K1+fiC?= =?us-ascii?Q?CqJ5G4A/Ni/ynEFwpA0Eh/74B24XN2sjZGfvYiyH50S15n/Qot8jyV+kkthx?= =?us-ascii?Q?oKqmJzk7uvzIbI9ZrrrxvbiqZAHosoN1/J2DzrIP7K9O2lULFL3791Q8GuWk?= =?us-ascii?Q?+9a/3uBPmjXwSCRevZ9y0tUg6KMQYGsqlAmLuqHYkViSS0d1JPXMdwahe0t7?= =?us-ascii?Q?OShIkfoXWMm6LOzV1cLtpbMgi7F8EuFOnKiSYl/l?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 341fc7f3-738b-44df-f13b-08ddf5453383 X-MS-Exchange-CrossTenant-AuthSource: PH7PR12MB5757.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Sep 2025 17:19:32.4937 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: EjmQ13RSj0Z960t1+t5GSw7mtIVaFDa31d2y75L2NwWOggCBGnh8VfbpxDh+LgXZ X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW6PR12MB8900 X-Stat-Signature: pprj5dfygqgue4sjtnxdrnf6m434uy7m X-Rspam-User: X-Rspamd-Queue-Id: EDF08160005 X-Rspamd-Server: rspam10 X-HE-Tag: 1758043176-611432 X-HE-Meta: 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 hOz2JulI 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Sep 16, 2025 at 03:11:53PM +0100, Lorenzo Stoakes wrote: > > -int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long vaddr, > - unsigned long pfn, unsigned long size, pgprot_t prot) > +static unsigned long calc_pfn(unsigned long pfn, unsigned long size) > { > phys_addr_t phys_addr = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); > > - return remap_pfn_range(vma, vaddr, phys_addr >> PAGE_SHIFT, size, prot); > + return phys_addr >> PAGE_SHIFT; > +} Given you changed all of these to add a calc_pfn why not make that the arch abstraction? static unsigned long arch_io_remap_remap_pfn(unsigned long pfn, unsigned long size) { .. } #define arch_io_remap_remap_pfn arch_io_remap_remap_pfn [..] #ifndef arch_io_remap_remap_pfn static inline unsigned long arch_io_remap_remap_pfn(unsigned long pfn, unsigned long size) { return pfn; } #endif static inline void io_remap_pfn_range_prepare(struct vm_area_desc *desc, unsigned long pfn, unsigned long size) { return remap_pfn_range_prepare(desc, arch_io_remap_remap_pfn(pfn)); } etc Removes alot of the maze here. Jason