CVS commit: src/sys/arch

["Manuel Bouyer" <bouyer%netbsd.org@localhost>]

Module Name:    src
Committed By:   bouyer
Date:           Mon May 23 15:03:05 UTC 2022

Modified Files:
        src/sys/arch/x86/pci: msipic.c msipic.h pci_machdep.c pci_msi_machdep.c
        src/sys/arch/xen/include: intr.h pci_machdep.h
        src/sys/arch/xen/x86: pintr.c

Log Message:
Work in progress on MSI/MSI-X on Xen (MSI works on my hardware, more work
needed for MSI-X):
- Xen silently rejects 32 bits writes to MSI configuration registers
  (especially when setting PCI_MSI_CTL_MSI_ENABLE/PCI_MSIX_CTL_ENABLE),
  it expects 16 bits writes. So introduce a pci_conf_write16(),
  only available on XENPV (and working only for mode 1 without
  PCI_OVERRIDE_CONF_WRITE) and use it to enable MSI or MSI-X on XENPV.
- for multi-MSI vectors, Xen allocates all of them in a single hypercall,
  so it's not convenient to do it at intr_establish() time.
  So do it at alloc() time and register the pirqs in the msipic structure.
  xen_pic_to_gsi() now just returns the values cached in the msipic.
  As a bonus, if the PHYSDEVOP_map_pirq hypercall fails we can fail
  the alloc() and we don't need the xen_pci_msi*_probe() hacks.

options NO_PCI_MSI_MSIX still on by default for XEN3_DOM0.


To generate a diff of this commit:
cvs rdiff -u -r1.25 -r1.26 src/sys/arch/x86/pci/msipic.c
cvs rdiff -u -r1.3 -r1.4 src/sys/arch/x86/pci/msipic.h
cvs rdiff -u -r1.89 -r1.90 src/sys/arch/x86/pci/pci_machdep.c
cvs rdiff -u -r1.16 -r1.17 src/sys/arch/x86/pci/pci_msi_machdep.c
cvs rdiff -u -r1.58 -r1.59 src/sys/arch/xen/include/intr.h
cvs rdiff -u -r1.20 -r1.21 src/sys/arch/xen/include/pci_machdep.h
cvs rdiff -u -r1.20 -r1.21 src/sys/arch/xen/x86/pintr.c

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