[PATCH 5/7] irqchip/gic-v3: Expose GICD_TYPER in the rdist structure

[Marc Zyngier]

Instead of exposing the GIC distributor IntID field in the rdist
structure that is passed to the ITS, let's replace it with a
copy of the whole GICD_TYPER register. We are going to need
some of this information at a later time.

No functionnal change.

Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
---
 drivers/irqchip/irq-gic-v3-its.c   | 2 +-
 drivers/irqchip/irq-gic-v3.c       | 4 ++--
 include/linux/irqchip/arm-gic-v3.h | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 554c9d040c5a..8c7e8c235faf 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1600,7 +1600,7 @@ static int __init its_alloc_lpi_tables(void)
 {
        phys_addr_t paddr;
 
-       lpi_id_bits = gic_rdists->id_bits;
+       lpi_id_bits = GICD_TYPER_ID_BITS(gic_rdists->gicd_typer);
        gic_rdists->prop_page = its_allocate_prop_table(GFP_NOWAIT);
        if (!gic_rdists->prop_page) {
                pr_err("Failed to allocate PROPBASE\n");
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 76ea56d779a1..e214181b77b7 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -877,7 +877,7 @@ static struct irq_chip gic_eoimode1_chip = {
        .flags                  = IRQCHIP_SET_TYPE_MASKED,
 };
 
-#define GIC_ID_NR              (1U << gic_data.rdists.id_bits)
+#define GIC_ID_NR      (1U << GICD_TYPER_ID_BITS(gic_data.rdists.gicd_typer))
 
 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
                              irq_hw_number_t hw)
@@ -1091,7 +1091,7 @@ static int __init gic_init_bases(void __iomem *dist_base,
         * The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI)
         */
        typer = readl_relaxed(gic_data.dist_base + GICD_TYPER);
-       gic_data.rdists.id_bits = GICD_TYPER_ID_BITS(typer);
+       gic_data.rdists.gicd_typer = typer;
        gic_irqs = GICD_TYPER_IRQS(typer);
        if (gic_irqs > 1020)
                gic_irqs = 1020;
diff --git a/include/linux/irqchip/arm-gic-v3.h 
b/include/linux/irqchip/arm-gic-v3.h
index cbb872c1b607..396cd99af02f 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -576,8 +576,8 @@ struct rdists {
                phys_addr_t     phys_base;
        } __percpu              *rdist;
        struct page             *prop_page;
-       int                     id_bits;
        u64                     flags;
+       u32                     gicd_typer;
        bool                    has_vlpis;
        bool                    has_direct_lpi;
 };
-- 
2.17.1