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* [PATCH 0/3] PCI/gic-v3-its: Add support for same ITS device ID for multiple PCIe devices
@ 2021-09-20  6:41 Kishon Vijay Abraham I
  2021-09-20  6:41 ` [PATCH 1/3] PCI: Add support in pci_walk_bus() to invoke callback matching RID Kishon Vijay Abraham I
                   ` (3 more replies)
  0 siblings, 4 replies; 15+ messages in thread
From: Kishon Vijay Abraham I @ 2021-09-20  6:41 UTC (permalink / raw)
  To: Thomas Gleixner, Marc Zyngier, Bjorn Helgaas
  Cc: linux-kernel, linux-pci, Lorenzo Pieralisi,
	Kishon Vijay Abraham I, lokeshvutla

AM64 has an issue in that it doesn't trigger interrupt if the address
in the *pre_its_window* is not aligned to 8-bytes (this is due to an
invalid bridge configuration in HW).

This means there will not be interrupts for devices with PCIe
requestor ID 0x1, 0x3, 0x5..., as the address in the pre-ITS window
would be 4 (1 << 2), 12 (3 << 2), 20 (5 << 2) respectively which are
not aligned to 8-bytes.

The DT binding has specified "msi-map-mask" using which multiple PCIe
devices could be made to use the same ITS device ID.

Add support in irq-gic-v3-its-pci-msi.c for such cases where multiple
PCIe devices are using the same ITS device ID.

Kishon Vijay Abraham I (3):
  PCI: Add support in pci_walk_bus() to invoke callback matching RID
  PCI: Export find_pci_root_bus()
  irqchip/gic-v3-its: Include "msi-map-mask" for calculating nvecs

 drivers/irqchip/irq-gic-v3-its-pci-msi.c | 21 ++++++++++++++++++++-
 drivers/pci/bus.c                        | 13 +++++++++----
 drivers/pci/host-bridge.c                |  3 ++-
 include/linux/pci.h                      |  8 ++++++--
 4 files changed, 37 insertions(+), 8 deletions(-)

-- 
2.17.1


^ permalink raw reply	[flat|nested] 15+ messages in thread

end of thread, other threads:[~2021-09-27 14:57 UTC | newest]

Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-09-20  6:41 [PATCH 0/3] PCI/gic-v3-its: Add support for same ITS device ID for multiple PCIe devices Kishon Vijay Abraham I
2021-09-20  6:41 ` [PATCH 1/3] PCI: Add support in pci_walk_bus() to invoke callback matching RID Kishon Vijay Abraham I
2021-09-20  8:56   ` Marc Zyngier
2021-09-20 14:28     ` Kishon Vijay Abraham I
2021-09-20 18:01       ` Marc Zyngier
2021-09-22  1:26         ` Kishon Vijay Abraham I
2021-09-27 14:45           ` Marc Zyngier
2021-09-27 14:56             ` Kishon Vijay Abraham I
2021-09-20  6:41 ` [PATCH 2/3] PCI: Export find_pci_root_bus() Kishon Vijay Abraham I
2021-09-20  8:37   ` Marc Zyngier
2021-09-20  6:41 ` [PATCH 3/3] irqchip/gic-v3-its: Include "msi-map-mask" for calculating nvecs Kishon Vijay Abraham I
2021-09-20  8:36   ` Marc Zyngier
2021-09-20  9:14 ` [PATCH 0/3] PCI/gic-v3-its: Add support for same ITS device ID for multiple PCIe devices Marc Zyngier
2021-09-20 11:22   ` Kishon Vijay Abraham I
2021-09-20 11:36     ` Marc Zyngier

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