When a VLPI is reconfigured (enabled, disabled, change in priority),
the full configuration byte must be written, and the caches invalidated.
Also, when using the irq_mask/irq_unmask methods, it is necessary
to disable the doorbell for that particular interrupt (by mapping it
to 1023) on top of clearing the Enable bit.
Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
---
drivers/irqchip/irq-gic-v3-its.c | 37 +++++++++++++++++++++++++++++++++++--
1 file changed, 35 insertions(+), 2 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index d50a019..6931018 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -796,11 +796,18 @@ static inline u32 its_get_event_id(struct irq_data *d)
static void lpi_update_config(struct irq_data *d, u8 clr, u8 set)
{
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
- irq_hw_number_t hwirq = d->hwirq;
+ irq_hw_number_t hwirq;
struct page *prop_page;
u8 *cfg;
- prop_page = gic_rdists->prop_page;
+ if (irqd_is_forwarded_to_vcpu(d)) {
+ u32 event = its_get_event_id(d);
+ prop_page =
its_dev->event_map.vlpi_map->vpes[0]->its_vm->vprop_page;
+ hwirq = its_dev->event_map.vlpi_map->vlpis[event].vintid;
+ } else {
+ prop_page = gic_rdists->prop_page;
+ hwirq = d->hwirq;
+ }
cfg = page_address(prop_page) + hwirq - 8192;
*cfg &= ~clr;
@@ -818,13 +825,28 @@ static void lpi_update_config(struct irq_data *d, u8 clr,
u8 set)
its_send_inv(its_dev, its_get_event_id(d));
}
+static void its_vlpi_set_doorbell(struct irq_data *d, bool enable)
+{
+ struct its_device *its_dev = irq_data_get_irq_chip_data(d);
+ u32 event = its_get_event_id(d);
+
+ its_dev->event_map.vlpi_map->vlpis[event].db_enabled = enable;
+ its_send_vmapti(its_dev, event);
+}
+
static void its_mask_irq(struct irq_data *d)
{
+ if (irqd_is_forwarded_to_vcpu(d))
+ its_vlpi_set_doorbell(d, false);
+
lpi_update_config(d, LPI_PROP_ENABLED, 0);
}
static void its_unmask_irq(struct irq_data *d)
{
+ if (irqd_is_forwarded_to_vcpu(d))
+ its_vlpi_set_doorbell(d, true);
+
lpi_update_config(d, 0, LPI_PROP_ENABLED);
}
@@ -837,6 +859,10 @@ static int its_set_affinity(struct irq_data *d, const
struct cpumask *mask_val,
struct its_collection *target_col;
u32 id = its_get_event_id(d);
+ /* A forwarded interrupt should use irq_set_vcpu_affinity */
+ if (irqd_is_forwarded_to_vcpu(d))
+ return -EINVAL;
+
/* lpi cannot be routed to a redistributor that is on a foreign node */
if (its_dev->its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144) {
if (its_dev->its->numa_node >= 0) {
@@ -969,6 +995,13 @@ static int its_irq_set_vcpu_affinity(struct irq_data *d,
void *vcpu_info)
case PROP_UPDATE_VLPI:
{
+ if (!its_dev->event_map.vlpi_map ||
+ !irqd_is_forwarded_to_vcpu(d))
+ return -EINVAL;
+
+ lpi_update_config(d, 0xff, info->config);
+ its_vlpi_set_doorbell(d, !!(info->config & LPI_PROP_ENABLED));
+
return 0;
}
--
2.1.4
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