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genirq/msi: Provide MSI_FLAG_PARENT_PM_DEV

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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
This commit is contained in:
Thomas Gleixner 2024-01-27 21:47:41 +05:30
parent e49312fe09
commit 9bbe13a5d4
2 changed files with 6 additions and 1 deletions
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2
include/linux/msi.h
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@ -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),

5
kernel/irq/msi.c
View File

@ -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;
}