linux-kernel - [PATCH 1/2] irqchip/gic-v3: Add __gic_get_ppi_index() to find the PPI number from hwirq

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Message-Id: <20210729172748.28841-2-james.morse@arm.com>
Date:   Thu, 29 Jul 2021 17:27:47 +0000
From:   James Morse <james.morse@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>
Subject: [PATCH 1/2] irqchip/gic-v3: Add __gic_get_ppi_index() to find the PPI number from hwirq

gic_get_ppi_index() is a useful concept for ppi partitions, as the GIC
has two PPI ranges but needs mapping to a single range when used as an
index in the gic_data.ppi_descs[] array.

Add a double-underscore version which takes just the intid. This will
be used in the partition domain select and translate helpers to enable
partition support for the EPPI range.

Signed-off-by: James Morse <james.morse@....com>
---
 drivers/irqchip/irq-gic-v3.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index e0f4debe64e1..b24f0a9d2876 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -446,18 +446,23 @@ static void gic_irq_set_prio(struct irq_data *d, u8 prio)
 	writeb_relaxed(prio, base + offset + index);
 }
 
-static u32 gic_get_ppi_index(struct irq_data *d)
+static u32 __gic_get_ppi_index(irq_hw_number_t hwirq)
 {
-	switch (get_intid_range(d)) {
+	switch (__get_intid_range(hwirq)) {
 	case PPI_RANGE:
-		return d->hwirq - 16;
+		return hwirq - 16;
 	case EPPI_RANGE:
-		return d->hwirq - EPPI_BASE_INTID + 16;
+		return hwirq - EPPI_BASE_INTID + 16;
 	default:
 		unreachable();
 	}
 }
 
+static u32 gic_get_ppi_index(struct irq_data *d)
+{
+	return __gic_get_ppi_index(d->hwirq);
+}
+
 static int gic_irq_nmi_setup(struct irq_data *d)
 {
 	struct irq_desc *desc = irq_to_desc(d->irq);
-- 
2.30.2