Commit 9bbe13a5 authored Jan 27, 2024 by Thomas Gleixner

genirq/msi: Provide MSI_FLAG_PARENT_PM_DEV



Some platform-MSI implementations require that power management is
redirected to the underlying interrupt chip device. To make this work
with per device MSI domains provide a new feature flag and let the
core code handle the setup of dev->pm_dev when set during device MSI
domain creation.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240127161753.114685-14-apatel@ventanamicro.com

parent e49312fe

include/linux/msi.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -554,6 +554,8 @@ enum {
		MSI_FLAG_FREE_MSI_DESCS = (1 << 6),
		/* Use dev->fwnode for MSI device domain creation */
		MSI_FLAG_USE_DEV_FWNODE = (1 << 7),
		/* Set parent->dev into domain->pm_dev on device domain creation */
		MSI_FLAG_PARENT_PM_DEV = (1 << 8),

		/* Mask for the generic functionality */
		MSI_GENERIC_FLAGS_MASK = GENMASK(15, 0),

kernel/irq/msi.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -845,8 +845,11 @@ static struct irq_domain __msi_create_irq_domain(struct fwnode_handle fwnode,
		domain = irq_domain_create_hierarchy(parent, flags \| IRQ_DOMAIN_FLAG_MSI, 0,
		fwnode, &msi_domain_ops, info);

		if (domain)
		if (domain) {
		irq_domain_update_bus_token(domain, info->bus_token);
		if (info->flags & MSI_FLAG_PARENT_PM_DEV)
		domain->pm_dev = parent->pm_dev;
		}

		return domain;
		}