From 54f45a30c0d0153d2be091ba2d683ab6db6d1d5b Mon Sep 17 00:00:00 2001 From: Inochi Amaoto Date: Thu, 14 Aug 2025 07:28:32 +0800 Subject: PCI/MSI: Add startup/shutdown for per device domains As the RISC-V PLIC cannot apply affinity settings without invoking irq_enable(), it will make the interrupt unavailble when used as an underlying interrupt chip for the MSI controller. Implement the irq_startup() and irq_shutdown() callbacks for the PCI MSI and MSI-X templates. For chips that specify MSI_FLAG_PCI_MSI_STARTUP_PARENT, the parent startup and shutdown functions are invoked. That allows the interrupt on the parent chip to be enabled if the interrupt has not been enabled during allocation. This is necessary for MSI controllers which use PLIC as underlying parent interrupt chip. Suggested-by: Thomas Gleixner Signed-off-by: Inochi Amaoto Signed-off-by: Thomas Gleixner Tested-by: Chen Wang # Pioneerbox Reviewed-by: Chen Wang Acked-by: Bjorn Helgaas Link: https://lore.kernel.org/all/20250813232835.43458-3-inochiama@gmail.com --- include/linux/msi.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux') diff --git a/include/linux/msi.h b/include/linux/msi.h index e5e86a8529fb..3111ba95fbde 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -568,6 +568,8 @@ enum { MSI_FLAG_PARENT_PM_DEV = (1 << 8), /* Support for parent mask/unmask */ MSI_FLAG_PCI_MSI_MASK_PARENT = (1 << 9), + /* Support for parent startup/shutdown */ + MSI_FLAG_PCI_MSI_STARTUP_PARENT = (1 << 10), /* Mask for the generic functionality */ MSI_GENERIC_FLAGS_MASK = GENMASK(15, 0), -- cgit v1.2.3