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[142.162.112.119]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8942e5e535dsm114108506d6.4.2026.01.20.10.18.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Jan 2026 10:18:20 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1viGJ1-00000005aZS-41Vi; Tue, 20 Jan 2026 14:18:19 -0400 Date: Tue, 20 Jan 2026 14:18:19 -0400 From: Jason Gunthorpe To: Edward Srouji Cc: Leon Romanovsky , Sumit Semwal , Christian =?utf-8?B?S8O2bmln?= , linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, Yishai Hadas Subject: Re: [PATCH rdma-next 2/2] RDMA/mlx5: Implement DMABUF export ops Message-ID: <20260120181819.GT961572@ziepe.ca> References: <20260108-dmabuf-export-v1-0-6d47d46580d3@nvidia.com> <20260108-dmabuf-export-v1-2-6d47d46580d3@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260108-dmabuf-export-v1-2-6d47d46580d3@nvidia.com> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Thu, Jan 08, 2026 at 01:11:15PM +0200, Edward Srouji wrote: > +static int phys_addr_to_bar(struct pci_dev *pdev, phys_addr_t pa) > +{ > + resource_size_t start, end; > + int bar; > + > + for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) { > + /* Skip BARs not present or not memory-mapped */ > + if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) > + continue; > + > + start = pci_resource_start(pdev, bar); > + end = pci_resource_end(pdev, bar); > + > + if (!start || !end) > + continue; > + > + if (pa >= start && pa <= end) > + return bar; > + } Don't we know which of the two BARs the mmap entry came from based on its type? This seems like overkill.. Jason