[RFC PATCH 2/3] irqchip/gic-v3: Implement gic_ipi_send_single()

Jingyi Wang
2021-03-29T09:06:52Z

We implement gic_ipi_send_single() to make single ipi injection
easier.

Signed-off-by: Jingyi Wang <wangjingyi11@huawei.com>
---
drivers/irqchip/irq-gic-v3.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 8ecc1b274ea8..5c44e1e719d6 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1124,6 +1124,26 @@ static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq)
gic_write_sgi1r(val);
}

+static void gic_ipi_send_single(struct irq_data *d, unsigned int cpu)
+{
+ unsigned long mpidr;
+ u64 cluster_id;
+ u16 tlist;
+
+ if (WARN_ON(d->hwirq >= 16))
+ return;
+
+ wmb();
+
+ mpidr = cpu_logical_map(cpu);
+ cluster_id = MPIDR_TO_SGI_CLUSTER_ID(mpidr);
+ tlist = 1 << (mpidr & 0xf);
+
+ gic_send_sgi(cluster_id, tlist, d->hwirq);
+
+ isb();
+}
+
static void gic_ipi_send_mask(struct irq_data *d, const struct cpumask *mask)
{
int cpu;
@@ -1279,6 +1299,7 @@ static struct irq_chip gic_chip = {
.irq_nmi_setup = gic_irq_nmi_setup,
.irq_nmi_teardown = gic_irq_nmi_teardown,
.ipi_send_mask = gic_ipi_send_mask,
+ .ipi_send_single = gic_ipi_send_single,
.flags = IRQCHIP_SET_TYPE_MASKED |
IRQCHIP_SKIP_SET_WAKE |
IRQCHIP_MASK_ON_SUSPEND,
@@ -1298,6 +1319,7 @@ static struct irq_chip gic_eoimode1_chip = {
.irq_nmi_setup = gic_irq_nmi_setup,
.irq_nmi_teardown = gic_irq_nmi_teardown,
.ipi_send_mask = gic_ipi_send_mask,
+ .ipi_send_single = gic_ipi_send_single,
.flags = IRQCHIP_SET_TYPE_MASKED |
IRQCHIP_SKIP_SET_WAKE |
IRQCHIP_MASK_ON_SUSPEND,
--
2.19.1