CVS commit: src/sys/arch/alpha

["Jason R Thorpe" <thorpej%netbsd.org@localhost>]

Module Name:    src
Committed By:   thorpej
Date:           Sat Sep 26 02:46:28 UTC 2020

Modified Files:
        src/sys/arch/alpha/include: pci_machdep.h
        src/sys/arch/alpha/pci: pci_machdep.c

Log Message:
Add support for CPU interrupt affinity for PCI interrupts:
- Keep a bitmap of eligible interrupt-handling CPUs in the pci_chipset_tag_t.
  If this bitmap is 0, then we assume that all PCI interrupts should be
  routed to the primary CPU.
- Add an optional PCI chipset callback for setting the CPU affinity of
  an interrupt.
- When an establishing an interrupt handler, select the CPU that will
  handle this irq using the following algorithm:
  ==> If the irq already has a CPU assignment, keep it.
  ==> Otherwise, find the CPU with the fewest registered handlers that
      is eligible from both a hardware (based on the pci_chipset_tag_t)
      and software (based on cpu_info::ci_schedstate.spc_flags) perspectives.
  ==> Fall back to the primary CPU failing all else.


To generate a diff of this commit:
cvs rdiff -u -r1.19 -r1.20 src/sys/arch/alpha/include/pci_machdep.h
cvs rdiff -u -r1.26 -r1.27 src/sys/arch/alpha/pci/pci_machdep.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.