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PCI/MSI: Make arch_.*_msi_irq[s] fallbacks selectable

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The arch_.*_msi_irq[s] fallbacks are compiled in whether an architecture
requires them or not. Architectures which are fully utilizing hierarchical
irq domains should never call into that code.

It's not only architectures which depend on that by implementing one or
more of the weak functions, there is also a bunch of drivers which relies
on the weak functions which invoke msi_controller::setup_irq[s] and
msi_controller::teardown_irq.

Make the architectures and drivers which rely on them select them in Kconfig
and if not selected replace them by stub functions which emit a warning and
fail the PCI/MSI interrupt allocation.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20200826112333.992429909@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-08-26 13:17:02 +02:00
parent 2c681e6b37
commit 077ee78e39
10 changed files with 40 additions and 6 deletions
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3
drivers/pci/controller/Kconfig
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@@ -41,6 +41,7 @@ config PCI_TEGRA
bool "NVIDIA Tegra PCIe controller"
depends on ARCH_TEGRA || COMPILE_TEST
depends on PCI_MSI_IRQ_DOMAIN
select PCI_MSI_ARCH_FALLBACKS
help
Say Y here if you want support for the PCIe host controller found
on NVIDIA Tegra SoCs.
@@ -67,6 +68,7 @@ config PCIE_RCAR_HOST
bool "Renesas R-Car PCIe host controller"
depends on ARCH_RENESAS || COMPILE_TEST
depends on PCI_MSI_IRQ_DOMAIN
select PCI_MSI_ARCH_FALLBACKS
help
Say Y here if you want PCIe controller support on R-Car SoCs in host
mode.
@@ -95,6 +97,7 @@ config PCI_HOST_GENERIC
config PCIE_XILINX
bool "Xilinx AXI PCIe host bridge support"
depends on OF || COMPILE_TEST
select PCI_MSI_ARCH_FALLBACKS
help
Say 'Y' here if you want kernel to support the Xilinx AXI PCIe
Host Bridge driver.