Re: [PATCH v17 net-next 07/11] net/nebula-matrix: add intr resource implementation

On 6/1/26 11:31 AM, illusion.wang wrote:

This patch adds the nbl_interrupt module for management of driver-private
MSI-X indices, plus hw_ops callbacks to program the function MSI-X mapping
registers, configure MSI-X info, and enable mailbox interrupts.

Key interfaces:
- configure_msix_map:   Allocates driver-private global MSI-X indices
                          (interrupt_net_bitmap / interrupt_others_bitmap)
                          and programs the hardware MSI-X mapping registers
                          (NBL_PCOMPLETER_FUNCTION_MSIX_MAP).
                          The actual PCI MSI-X vector allocation is done
                          by nbl_dev_alloc_msix_intr().
- destroy_msix_map:     Releases MSI-X indices and tears down the mapping.
- set_mailbox_irq:       Enables/disables a specific mailbox interrupt.
- configure_msix_info:   Programs PADPT_HOST_MSIX_INFO and
                          PCOMPLETER_HOST_MSIX_FID_TABLE.

The patch does not use kernel MSI-X allocation primitives
(pci_alloc_irq_vectors, pci_msix_alloc_irq_at, irq_domain). It manages
a driver-private global index space and programs vendor-specific
MSI-X mapping registers.

Note: Mutual exclusion for configure_msix_map, destroy_msix_map, and
enable_mailbox_irq is handled by the dispatch layer; these functions
assume the caller already holds the necessary lock.

Adding assertion based on mutex_is_locked() would make the above obvious
and will prevent locking issues.

/P