The following commit has been merged into the irq/core branch of tip:
Commit-ID: 8594c3b85171b6f68e34e07b533ec2f1bf7fb065
Gitweb: https://git.kernel.org/tip/8594c3b85171b6f68e34e07b533ec2f1bf7fb065
Author: Marc Zyngier <maz@xxxxxxxxxx>
AuthorDate: Tue, 15 Sep 2020 14:03:51 +01:00
Committer: Marc Zyngier <maz@xxxxxxxxxx>
CommitterDate: Thu, 17 Sep 2020 16:37:29 +01:00
irqchip/gic: Cleanup Franken-GIC handling
Introduce a static key identifying Samsung's unique creation, allowing
to replace the indirect call to compute the base addresses with
a simple test on the static key.
Faster, cheaper, negative diffstat.
Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
drivers/irqchip/irq-gic.c | 41 +++++++++++---------------------------
1 file changed, 12 insertions(+), 29 deletions(-)
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 66671e1..30edcca 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -83,9 +83,6 @@ struct gic_chip_data {
#endif
struct irq_domain *domain;
unsigned int gic_irqs;
-#ifdef CONFIG_GIC_NON_BANKED
- void __iomem *(*get_base)(union gic_base *);
-#endif
};
#ifdef CONFIG_BL_SWITCHER
@@ -127,35 +124,27 @@ static struct gic_kvm_info gic_v2_kvm_info;
static DEFINE_PER_CPU(u32, sgi_intid);
#ifdef CONFIG_GIC_NON_BANKED
-static void __iomem *gic_get_percpu_base(union gic_base *base)
-{
- return raw_cpu_read(*base->percpu_base);
-}
+static DEFINE_STATIC_KEY_FALSE(frankengic_key);
-static void __iomem *gic_get_common_base(union gic_base *base)
+static void enable_frankengic(void)
{
- return base->common_base;
+ static_branch_enable(&frankengic_key);
}
-static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
+static inline void __iomem *__get_base(union gic_base *base)
{
- return data->get_base(&data->dist_base);
-}
+ if (static_branch_unlikely(&frankengic_key))
+ return raw_cpu_read(*base->percpu_base);
-static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
-{
- return data->get_base(&data->cpu_base);
+ return base->common_base;
}
-static inline void gic_set_base_accessor(struct gic_chip_data *data,
- void __iomem *(*f)(union gic_base *))
-{
- data->get_base = f;
-}
+#define gic_data_dist_base(d) __get_base(&(d)->dist_base)
+#define gic_data_cpu_base(d) __get_base(&(d)->cpu_base)
#else
#define gic_data_dist_base(d) ((d)->dist_base.common_base)
#define gic_data_cpu_base(d) ((d)->cpu_base.common_base)
-#define gic_set_base_accessor(d, f)
+#define enable_frankengic() do { } while(0)
#endif
static inline void __iomem *gic_dist_base(struct irq_data *d)
@@ -307,7 +296,7 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
/* Interrupt configuration for SGIs can't be changed */
if (gicirq < 16)
- return type == IRQ_TYPE_EDGE_RISING ? 0 : -EINVAL;
+ return type != IRQ_TYPE_EDGE_RISING ? -EINVAL : 0;
/* SPIs have restrictions on the supported types */
if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
@@ -720,11 +709,6 @@ static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v)
int i;
for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++) {
-#ifdef CONFIG_GIC_NON_BANKED
- /* Skip over unused GICs */
- if (!gic_data[i].get_base)
- continue;
-#endif
switch (cmd) {
case CPU_PM_ENTER:
gic_cpu_save(&gic_data[i]);
@@ -1165,7 +1149,7 @@ static int gic_init_bases(struct gic_chip_data *gic,
gic->raw_cpu_base + offset;
}
- gic_set_base_accessor(gic, gic_get_percpu_base);
+ enable_frankengic();
} else {
/* Normal, sane GIC... */
WARN(gic->percpu_offset,
@@ -1173,7 +1157,6 @@ static int gic_init_bases(struct gic_chip_data *gic,
gic->percpu_offset);
gic->dist_base.common_base = gic->raw_dist_base;
gic->cpu_base.common_base = gic->raw_cpu_base;
- gic_set_base_accessor(gic, gic_get_common_base);
}
/*
|