Received-SPF: pass (google.com: domain of linux-kernel+bounces-41287-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) client-ip=2604:1380:40f1:3f00::1;
From: Anup Patel <apatel@ventanamicro.com>
To: Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Frank Rowand <frowand.list@gmail.com>,
	Conor Dooley <conor+dt@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>,
	=?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= <bjorn@kernel.org>,
	Atish Patra <atishp@atishpatra.org>,
	Andrew Jones <ajones@ventanamicro.com>,
	Sunil V L <sunilvl@ventanamicro.com>,
	Saravana Kannan <saravanak@google.com>,
	Anup Patel <anup@brainfault.org>,
	linux-riscv@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org,
	Anup Patel <apatel@ventanamicro.com>
Subject: [PATCH v12 13/25] genirq/msi: Provide MSI_FLAG_PARENT_PM_DEV
Date: Sat, 27 Jan 2024 21:47:41 +0530
Message-Id: <20240127161753.114685-14-apatel@ventanamicro.com>
In-Reply-To: <20240127161753.114685-1-apatel@ventanamicro.com>
References: <20240127161753.114685-1-apatel@ventanamicro.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

From: Thomas Gleixner <tglx@linutronix.de>

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>
---
 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 ac73f678da7d..b21581ca8e9a 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;
 }
-- 
2.34.1