Driver __link__ - Pci Device

// 4. Map BAR0 (control registers) into kernel virtual address space void __iomem *regs = pci_iomap(pdev, 0, 0);

In modern computing, the Peripheral Component Interconnect (PCI) bus is the circulatory system of the motherboard. From GPUs and NVMe SSDs to network adapters and sound cards, almost every high-speed peripheral relies on PCI or its derivatives (PCIe). pci device driver

pci_enable_device(pdev); pci_request_regions(pdev, "my_pci_driver"); pci_iomap(pdev, 0, 0); return 0; In modern computing

// 1. Enable the PCI device pci_enable_device(pdev); // 2. Request ownership of memory regions (BARs) pci_request_regions(pdev, "my_driver"); pci device driver