linux-kernel - [RFC PATCH v1 21/21] irqchip/sifive-plic: Add GSI conversion support

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Date:   Thu,  3 Aug 2023 23:29:16 +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 21/21] irqchip/sifive-plic: Add GSI conversion support

ACPI uses flat Global System Interrupt Vector space and
hence the GSI number needs to be converted to corresponding
local IRQ number of the interrupt controller. Add a new
gsi_base field in the priv structure to handle this which
will be 0 on DT based systems.

Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
 drivers/irqchip/irq-sifive-plic.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index 72d6e06ef52b..1c22070e9cdd 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -68,6 +68,7 @@ struct plic_priv {
 	unsigned long plic_quirks;
 	unsigned int nr_irqs;
 	unsigned long *prio_save;
+	u32 gsi_base;
 };
 
 struct plic_handler {
@@ -314,6 +315,10 @@ static int plic_irq_domain_translate(struct irq_domain *d,
 {
 	struct plic_priv *priv = d->host_data;
 
+	/* For DT, gsi_base is always zero. */
+	if (fwspec->param[0] >= priv->gsi_base)
+		fwspec->param[0] = fwspec->param[0] - priv->gsi_base;
+
 	if (test_bit(PLIC_QUIRK_EDGE_INTERRUPT, &priv->plic_quirks))
 		return irq_domain_translate_twocell(d, fwspec, hwirq, type);
 
@@ -453,6 +458,17 @@ static int plic_probe(struct platform_device *pdev)
 		return -EIO;
 	}
 
+	/*
+	 * Find out GSI base number
+	 *
+	 * Note: DT does not define "riscv,gsi-base" property so GSI
+	 * base is always zero for DT.
+	 */
+	rc = fwnode_property_read_u32_array(dev->fwnode, "riscv,gsi-base",
+					    &priv->gsi_base, 1);
+	if (rc)
+		priv->gsi_base = 0;
+
 	rc = fwnode_property_read_u32_array(dev->fwnode, "riscv,ndev",
 						&nr_irqs, 1);
 	if (rc) {
-- 
2.39.2