Pci Device Driver [better] -

// 5. Set up interrupt handler request_irq(pdev->irq, my_interrupt_handler, IRQF_SHARED, "my_driver", dev);

static int my_probe(struct pci_dev *pdev, const struct pci_device_id *id)

| Feature | Impact on Driver | |---------|------------------| | | Use pci_read_config_dword() for offsets up to 4095. | | Message Signaled Interrupts (MSI/MSI-X) | Prefer pci_alloc_irq_vectors() over legacy IRQ. Enables per-vector affinity. | | Atomic Operations | Not directly visible to drivers, but lower latency benefits. | | Power Management (ASPM) | Driver may need to pci_disable_link_state() to avoid performance regressions. |

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

// 6. Initialize device-specific state my_device_init(regs);