From 9bbe13a5d414a7f8208dba64b54d2b6e4f7086bd Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Sat, 27 Jan 2024 21:47:41 +0530 Subject: [PATCH] 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 Signed-off-by: Anup Patel Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/20240127161753.114685-14-apatel@ventanamicro.com --- include/linux/msi.h | 2 ++ kernel/irq/msi.c | 5 ++++- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/include/linux/msi.h b/include/linux/msi.h index 36ba6a0852ea..26d07e23052e 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -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), diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 07e9daaf0657..f90952ebc494 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -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; }