| 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. |
static void my_remove(struct pci_dev *pdev) pci device driver
// 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
// 5. Set up interrupt handler request_irq(pdev->irq, my_interrupt_handler, IRQF_SHARED, "my_driver", dev); pci device driver