[PATCH v3 13/32] irqchip/gic-v4.1: Add VPE INVALL callback

Marc Zyngier
2019-12-24T11:41:25Z

GICv4.1 redistributors have a VPE-aware INVALL register. Progress!
We can now emulate a guest-requested INVALL without emiting a
VINVALL command.

Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
drivers/irqchip/irq-gic-v3-its.c | 14 ++++++++++++++
include/linux/irqchip/arm-gic-v3.h | 6 ++++++
2 files changed, 20 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index a5567d099a3e..403f5753e1ed 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -3670,6 +3670,19 @@ static void its_vpe_4_1_deschedule(struct its_vpe *vpe,
}
}

+static void its_vpe_4_1_invall(struct its_vpe *vpe)
+{
+ void __iomem *rdbase;
+ u64 val;
+
+ val = GICR_INVALLR_V;
+ val |= FIELD_PREP(GICR_INVALLR_VPEID, vpe->vpe_id);
+
+ /* Target the redistributor this vPE is currently known on */
+ rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base;
+ gic_write_lpir(val, rdbase + GICR_INVALLR);
+}
+
static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
{
struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
@@ -3685,6 +3698,7 @@ static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
return 0;

case INVALL_VPE:
+ its_vpe_4_1_invall(vpe);
return 0;

default:
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index 1c91dede7663..37b14fb82773 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -249,6 +249,12 @@
#define GICR_TYPER_COMMON_LPI_AFF GENMASK_ULL(25, 24)
#define GICR_TYPER_AFFINITY GENMASK_ULL(63, 32)

+#define GICR_INVLPIR_VPEID GENMASK_ULL(47, 32)
+#define GICR_INVLPIR_V GENMASK_ULL(63, 63)
+
+#define GICR_INVALLR_VPEID GICR_INVLPIR_VPEID
+#define GICR_INVALLR_V GICR_INVLPIR_V
+
#define GIC_V3_REDIST_SIZE 0x20000

#define LPI_PROP_GROUP1 (1 << 1)
--
2.20.1