irqchip/gic-v3-its: Provide MSI parent for PCI/MSI[-X]

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The its_pci_msi_prepare() function from the ITS-PCI/MSI code provides the
'global' PCI/MSI domains. Move this function to the ITS-MSI parent code and
amend the function to use the domain hardware size, which is the MSI[X]
vector count, for allocating the ITS slots for the PCI device.

Enable PCI matching in msi_parent_ops and provide the necessary update to
the ITS specific child domain initialization function so that the prepare
callback gets invoked on allocations.

The latter might be optimized to do the allocation right at the point where
the child domain is initialized, but keep it simple for now.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Shivamurthy Shastri <shivamurthy.shastri@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240623142235.024567623@linutronix.de

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This commit is contained in:

Thomas Gleixner 2024-06-23 17:18:39 +02:00

parent 8c41ccec83

commit b5712bf89b

3 changed files with 111 additions and 206 deletions

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1

drivers/irqchip/Makefile

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114

drivers/irqchip/irq-gic-v3-its-msi-parent.c

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202

drivers/irqchip/irq-gic-v3-its-pci-msi.c

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