linux-kernel - [tip: irq/msi] genirq/msi: Provide MSI_FLAG_PARENT_PM

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Date: Thu, 15 Feb 2024 19:56:56 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>, Anup Patel <apatel@...tanamicro.com>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: irq/msi] genirq/msi: Provide MSI_FLAG_PARENT_PM_DEV

The following commit has been merged into the irq/msi branch of tip:

Commit-ID:     9bbe13a5d414a7f8208dba64b54d2b6e4f7086bd
Gitweb:        https://git.kernel.org/tip/9bbe13a5d414a7f8208dba64b54d2b6e4f7086bd
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Sat, 27 Jan 2024 21:47:41 +05:30
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 15 Feb 2024 17:55:41 +01:00

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@...utronix.de>
Signed-off-by: Anup Patel <apatel@...tanamicro.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
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 36ba6a0..26d07e2 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 07e9daa..f90952e 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;
 }