On Wed, 26 Aug 2020 12:17:02 +0100, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > From: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > > 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@xxxxxxxxxxxxx> > --- > V2: Make the architectures (and drivers) which need the fallbacks select them > and not the other way round (Bjorn). > --- > arch/ia64/Kconfig | 1 + > arch/mips/Kconfig | 1 + > arch/powerpc/Kconfig | 1 + > arch/s390/Kconfig | 1 + > arch/sparc/Kconfig | 1 + > arch/x86/Kconfig | 1 + > drivers/pci/Kconfig | 3 +++ > drivers/pci/controller/Kconfig | 3 +++ > drivers/pci/msi.c | 3 ++- > include/linux/msi.h | 31 ++++++++++++++++++++++++++----- > 10 files changed, 40 insertions(+), 6 deletions(-) > [...] > --- a/drivers/pci/controller/Kconfig > +++ b/drivers/pci/controller/Kconfig > @@ -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. > @@ -103,6 +105,7 @@ config PCIE_XILINX_CPM > bool "Xilinx Versal CPM host bridge support" > depends on ARCH_ZYNQMP || COMPILE_TEST > select PCI_HOST_COMMON > + select PCI_MSI_ARCH_FALLBACKS This guy actually doesn't implement MSIs at all (it seems to delegate them to an ITS present in the system, if I read the DT binding correctly). However its older brother from the same silicon dealer seems to need it. The patchlet below should fix it. diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig index 9ad13919bcaa..f56ff049d469 100644 --- a/drivers/pci/controller/Kconfig +++ b/drivers/pci/controller/Kconfig @@ -96,6 +96,7 @@ config PCI_HOST_GENERIC config PCIE_XILINX bool "Xilinx AXI PCIe host bridge support" + select PCI_MSI_ARCH_FALLBACKS depends on OF || COMPILE_TEST help Say 'Y' here if you want kernel to support the Xilinx AXI PCIe @@ -105,7 +106,6 @@ config PCIE_XILINX_CPM bool "Xilinx Versal CPM host bridge support" depends on ARCH_ZYNQMP || COMPILE_TEST select PCI_HOST_COMMON - select PCI_MSI_ARCH_FALLBACKS help Say 'Y' here if you want kernel support for the Xilinx Versal CPM host bridge. With that fixed, Acked-by: Marc Zyngier <maz@xxxxxxxxxx> M. -- Without deviation from the norm, progress is not possible.
