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Mon, 3 May 2021 23:40:03 +0000 Received: from [10.2.50.162] (172.20.145.6) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 3 May 2021 23:40:03 +0000 Subject: Re: [PATCH 04/16] PCI/P2PDMA: Refactor pci_p2pdma_map_type() to take pagmap and device To: Jason Gunthorpe CC: Logan Gunthorpe , , , , , , , Stephen Bates , Christoph Hellwig , Dan Williams , =?UTF-8?Q?Christian_K=c3=b6nig?= , Don Dutile , Matthew Wilcox , Daniel Vetter , Jakowski Andrzej , Minturn Dave B , Jason Ekstrand , Dave Hansen , Xiong Jianxin , Bjorn Helgaas , Ira Weiny , Robin Murphy References: <20210408170123.8788-1-logang@deltatee.com> <20210408170123.8788-5-logang@deltatee.com> <20210503225705.GA2047089@ziepe.ca> From: John Hubbard Message-ID: <4fd9381a-d9aa-31fe-c1d8-660e2dbaab62@nvidia.com> Date: Mon, 3 May 2021 16:40:02 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: <20210503225705.GA2047089@ziepe.ca> Content-Type: text/plain; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 May 2021 23:40:03.8504 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: deea838f-aa53-493e-1b57-08d90e8cc6a1 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.34];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT049.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR12MB4629 Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=dt7H9XSK; dmarc=pass (policy=none) header.from=nvidia.com; spf=none (imf22.hostedemail.com: domain of jhubbard@nvidia.com has no SPF policy when checking 40.107.76.70) smtp.mailfrom=jhubbard@nvidia.com X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 5E3ECC0007C6 X-Stat-Signature: s7xuge86cyoj1rnxu5dynbznnkjoikiq Received-SPF: none (nvidia.com>: No applicable sender policy available) receiver=imf22; identity=mailfrom; envelope-from=""; helo=NAM02-CY1-obe.outbound.protection.outlook.com; client-ip=40.107.76.70 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1620085204-900283 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: On 5/3/21 3:57 PM, Jason Gunthorpe wrote: > On Mon, May 03, 2021 at 02:54:26PM -0700, John Hubbard wrote: > >> I guess my main concern here is that there are these pci*() functions >> that somehow want to pass around struct device. > > Well, this is the main issue - helpers being used inside IOMMU code > should not be called pci* functions. This is some generic device p2p > interface that happens to only support PCI to PCI transfers today. > Yes, maybe renaming a few levels of functions would help at least clarify what the code can do. Once the code reaches layers that truly are PCI-specific, that's where it should transition to using pci_dev args, and that's also where it should return -ENOTSUPP back up the calling stack. thanks, -- John Hubbard NVIDIA