linux-kernel - [RFC PATCH v1 18/21] irqchip/irq-riscv-aplic-msi: Add ACPI support

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Date:   Thu,  3 Aug 2023 23:29:13 +0530
From:   Sunil V L <sunilvl@...tanamicro.com>
To:     linux-doc@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org
Cc:     Jonathan Corbet <corbet@....net>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Anup Patel <anup@...infault.org>,
        Marc Zyngier <maz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Robert Moore <robert.moore@...el.com>,
        Haibo Xu <haibo1.xu@...el.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Atish Kumar Patra <atishp@...osinc.com>,
        Sunil V L <sunilvl@...tanamicro.com>
Subject: [RFC PATCH v1 18/21] irqchip/irq-riscv-aplic-msi: Add ACPI support

Search and configure the MSI domain for the APLIC
on ACPI based systems.

Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
 drivers/irqchip/irq-riscv-aplic-msi.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-riscv-aplic-msi.c b/drivers/irqchip/irq-riscv-aplic-msi.c
index 086d00e0429e..1948444c9e0c 100644
--- a/drivers/irqchip/irq-riscv-aplic-msi.c
+++ b/drivers/irqchip/irq-riscv-aplic-msi.c
@@ -16,6 +16,7 @@
 #include <linux/platform_device.h>
 #include <linux/printk.h>
 #include <linux/smp.h>
+#include <asm/acpi.h>
 
 #include "irq-riscv-aplic-main.h"
 
@@ -178,6 +179,8 @@ static void aplic_msi_write_msg(struct msi_desc *desc, struct msi_msg *msg)
 int aplic_msi_setup(struct device *dev, void __iomem *regs)
 {
 	const struct imsic_global_config *imsic_global;
+	struct irq_domain *msi_domain = NULL;
+	struct fwnode_handle *msi_fwnode;
 	struct irq_domain *irqdomain;
 	struct aplic_priv *priv;
 	struct aplic_msicfg *mc;
@@ -261,8 +264,17 @@ int aplic_msi_setup(struct device *dev, void __iomem *regs)
 		 * IMSIC and the IMSIC MSI domains are created later through
 		 * the platform driver probing so we set it explicitly here.
 		 */
-		if (is_of_node(dev->fwnode))
+		if (is_of_node(dev->fwnode)) {
 			of_msi_configure(dev, to_of_node(dev->fwnode));
+		} else {
+			msi_fwnode = acpi_riscv_get_msi_fwnode(dev);
+			if (msi_fwnode)
+				msi_domain = irq_find_matching_fwnode(msi_fwnode,
+								      DOMAIN_BUS_PLATFORM_MSI);
+
+			if (msi_domain)
+				dev_set_msi_domain(dev, msi_domain);
+		}
 	}
 
 	/* Create irq domain instance for the APLIC MSI-mode */
-- 
2.39.2