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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Jan 2026 10:36:17.4180 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f78cd707-a648-420b-667c-08de58d8e8d5 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF00003444.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB9203 On 20/01/2026 20:18, Jason Gunthorpe wrote: > 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.. > Actually no. Currently, a given type can reside on different BARs based on function type (i.e. PF/SF). As we don't have any cap/knowledge for the above mapping, we would prefer the above code which finds the correct bar (for now 0 or 2) dynamically. Yishai