linux-kernel - [PATCH v13 3/9] irqchip/gic-v3-its: Add helper function its_pmsi_prepare

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Message-Id: <20241218-ep-msi-v13-3-646e2192dc24@nxp.com>
Date: Wed, 18 Dec 2024 18:08:38 -0500
From: Frank Li <Frank.Li@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Thomas Gleixner <tglx@...utronix.de>, Anup Patel <apatel@...tanamicro.com>, 
 Marc Zyngier <maz@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, 
 imx@...ts.linux.dev, Niklas Cassel <cassel@...nel.org>, dlemoal@...nel.org, 
 jdmason@...zu.us, linux-arm-kernel@...ts.infradead.org, 
 Frank Li <Frank.Li@....com>
Subject: [PATCH v13 3/9] irqchip/gic-v3-its: Add helper function
 its_pmsi_prepare_devid()

Add helper function its_pmsi_prepare_devid() to pave road to support new
DOMAIN_BUS_DEVICE_PCI_EP_MSI. No function change.

Signed-off-by: Frank Li <Frank.Li@....com>
---
change from v12 to v13
- new patch
---
 drivers/irqchip/irq-gic-v3-its-msi-parent.c | 30 ++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its-msi-parent.c b/drivers/irqchip/irq-gic-v3-its-msi-parent.c
index 75aa0d4bd1346..b2a4b67545b82 100644
--- a/drivers/irqchip/irq-gic-v3-its-msi-parent.c
+++ b/drivers/irqchip/irq-gic-v3-its-msi-parent.c
@@ -132,19 +132,10 @@ int __weak iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
 	return -1;
 }

-static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
-			    int nvec, msi_alloc_info_t *info)
+static int its_pmsi_prepare_devid(struct irq_domain *domain, struct device *dev,
+				  int nvec, msi_alloc_info_t *info, u32 dev_id)
 {
 	struct msi_domain_info *msi_info;
-	u32 dev_id;
-	int ret;
-
-	if (dev->of_node)
-		ret = of_pmsi_get_dev_id(domain->parent, dev, &dev_id);
-	else
-		ret = iort_pmsi_get_dev_id(dev, &dev_id);
-	if (ret)
-		return ret;

 	/* ITS specific DeviceID, as the core ITS ignores dev. */
 	info->scratchpad[0].ul = dev_id;
@@ -165,6 +156,23 @@ static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
 					  dev, nvec, info);
 }

+static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
+			    int nvec, msi_alloc_info_t *info)
+{
+	u32 dev_id;
+	int ret;
+
+	if (dev->of_node)
+		ret = of_pmsi_get_dev_id(domain->parent, dev, &dev_id);
+	else
+		ret = iort_pmsi_get_dev_id(dev, &dev_id);
+
+	if (ret)
+		return ret;
+
+	return its_pmsi_prepare_devid(domain, dev, nvec, info, dev_id);
+}
+
 static bool its_init_dev_msi_info(struct device *dev, struct irq_domain *domain,
 				  struct irq_domain *real_parent, struct msi_domain_info *info)
 {

-- 
2.34.1