From: Janne Grunau <j@xxxxxxxxxx> The iommu on Apple's M1 and M2 supports only a page size of 16kB and is mandatory for PCIe devices. Mismatched page sizes will render devices useless due to non-working DMA. While the iommu prints a warning in this scenario, it seems a common and hard to debug problem, so prevent it at build-time. Signed-off-by: Janne Grunau <j@xxxxxxxxxx> Signed-off-by: Alyssa Rosenzweig <alyssa@xxxxxxxxxxxxx> --- drivers/pci/controller/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig index 9800b768105402d6dd1ba4b134c2ec23da6e4201..507e6ac5d65257578e4eec74b459f6605c9c2907 100644 --- a/drivers/pci/controller/Kconfig +++ b/drivers/pci/controller/Kconfig @@ -39,6 +39,7 @@ config PCIE_APPLE depends on ARCH_APPLE || COMPILE_TEST depends on OF depends on PCI_MSI + depends on PAGE_SIZE_16KB || COMPILE_TEST select PCI_HOST_COMMON help Say Y here if you want to enable PCIe controller support on Apple --- base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b change-id: 20250211-pci-16k-4c391a5dcd18 Best regards, -- Alyssa Rosenzweig <alyssa@xxxxxxxxxxxxx>
