[PATCH 00/31] powerpc: Modernize the PCI/MSI support

[Cédric Le Goater]

Hello,

This series adds support for MSI IRQ domains on top of the XICS (P8)
and XIVE (P9/P10) IRQ domains for the PowerNV (baremetal) and pSeries
(VM) platforms. It should improve greatly IRQ affinity of PCI MSIs
under these PowerPC platforms. Data locality can still be improved
with a machine IRQ domain per chip but this requires FW changes.

The patchset has a large impact but it is well contained under the MSI
support. Initial tests were done on the P8, P9 and P10 PowerNV and
pSeries platforms, under the KVM and PowerVM hypervisor. PCI passthrough
was tested on P8/KVM, P9/KVM and P9/pVM.

P8 passthrough adds an optimization to EOI MSIs when under real mode
but I didn't see any performance improvements with a passthrough 10G
Ethernet adapter. If someone has faster adapters, I would be interested
by the results.

The P8/CAPI driver is also impacted. Tests were done on a Firestone
system with a memory AFU.

Thanks,

C.

Cédric Le Goater (31):
  powerpc/pseries/pci: Introduce __find_pe_total_msi()
  powerpc/pseries/pci: Introduce rtas_prepare_msi_irqs()
  powerpc/xive: Add support for IRQ domain hierarchy
  powerpc/xive: Ease debugging of xive_irq_set_affinity()
  powerpc/pseries/pci: Add MSI domains
  powerpc/xive: Drop unmask of MSIs at startup
  powerpc/xive: Fix xive_irq_set_affinity for MSI
  powerpc/pseries/pci: Add a domain_free_irqs handler
  powerpc/pseries/pci: Add a msi_free() handler to clear XIVE data
  powerpc/pseries/pci: Add support of MSI domains to PHB hotplug
  powerpc/powernv/pci: Introduce __pnv_pci_ioda_msi_setup()
  powerpc/powernv/pci: Add MSI domains
  KVM: PPC: Book3S HV: Use the new IRQ chip to detect passthrough
    interrupts
  KVM: PPC: Book3S HV: XIVE: Change interface of passthrough interrupt
    routines
  KVM: PPC: Book3S HV: XIVE: Fix mapping of passthrough interrupts
  powerpc/xics: Remove ICS list
  powerpc/xics: Rename the map handler in a check handler
  powerpc/xics: Give a name to the default XICS IRQ domain
  powerpc/xics: Add debug logging to the set_irq_affinity handlers
  powerpc/xics: Add support for IRQ domain hierarchy
  powerpc/powernv/pci: Customize the MSI EOI handler to support PHB3
  powerpc/pci: Drop XIVE restriction on MSI domains
  powerpc/xics: Drop unmask of MSIs at startup
  powerpc/pseries/pci: Drop unused MSI code
  powerpc/powernv/pci: Drop unused MSI code
  powerpc/powernv/pci: Adapt is_pnv_opal_msi() to detect passthrough
    interrupt
  powerpc/xics: Fix IRQ migration
  powerpc/powernv/pci: Set the IRQ chip data for P8/CXL devices
  powerpc/powernv/pci: Rework pnv_opal_pci_msi_eoi()
  KVM: PPC: Book3S HV: XICS: Fix mapping of passthrough interrupts
  genirq: Improve "hwirq" output in /proc and /sys/

 arch/powerpc/include/asm/kvm_ppc.h         |   4 +-
 arch/powerpc/include/asm/pci-bridge.h      |   5 +
 arch/powerpc/include/asm/pnv-pci.h         |   2 +-
 arch/powerpc/include/asm/xics.h            |   3 +-
 arch/powerpc/include/asm/xive.h            |   1 +
 arch/powerpc/platforms/powernv/pci.h       |   6 -
 arch/powerpc/platforms/pseries/pseries.h   |   2 +
 arch/powerpc/kernel/pci-common.c           |   6 +
 arch/powerpc/kvm/book3s_hv.c               |  18 +-
 arch/powerpc/kvm/book3s_hv_rm_xics.c       |   8 +-
 arch/powerpc/kvm/book3s_xive.c             |  18 +-
 arch/powerpc/platforms/powernv/pci-ioda.c  | 258 ++++++++++++++++--
 arch/powerpc/platforms/powernv/pci.c       |  67 -----
 arch/powerpc/platforms/pseries/msi.c       | 296 ++++++++++++++++-----
 arch/powerpc/platforms/pseries/pci_dlpar.c |   4 +
 arch/powerpc/platforms/pseries/setup.c     |   2 +
 arch/powerpc/sysdev/xics/ics-opal.c        |  40 +--
 arch/powerpc/sysdev/xics/ics-rtas.c        |  40 +--
 arch/powerpc/sysdev/xics/xics-common.c     | 125 ++++++---
 arch/powerpc/sysdev/xive/common.c          |  81 +++++-
 kernel/irq/irqdesc.c                       |   2 +-
 kernel/irq/irqdomain.c                     |   1 +
 kernel/irq/proc.c                          |   2 +-
 23 files changed, 693 insertions(+), 298 deletions(-)

-- 
2.26.3