[RFC PATCH 27/33] irqchip/gic-v3-its: Add VPE interrupt masking

[Marc Zyngier]

When masking/unmasking a doorbell interrupt, it is necessary
to issue an invalidation to the corresponding redistributor.
We use the DirectLPI feature by writting directly to the corresponding
redistributor.

Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
---
 drivers/irqchip/irq-gic-v3-its.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 06e959f..008fb71 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -950,14 +950,19 @@ static inline u32 its_get_event_id(struct irq_data *d)
        return d->hwirq - its_dev->event_map.lpi_base;
 }
 
+static inline bool its_is_vpe_lpi(struct irq_data *d)
+{
+       return !irq_desc_get_msi_desc(irq_data_to_desc(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;
        struct page *prop_page;
        u8 *cfg;
 
        if (irqd_is_forwarded_to_vcpu(d)) {
+               struct its_device *its_dev = irq_data_get_irq_chip_data(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;
@@ -979,7 +984,18 @@ static void lpi_update_config(struct irq_data *d, u8 clr, 
u8 set)
                gic_flush_dcache_to_poc(cfg, sizeof(*cfg));
        else
                dsb(ishst);
-       its_send_inv(its_dev, its_get_event_id(d));
+
+       if (!its_is_vpe_lpi(d)) {
+               struct its_device *its_dev = irq_data_get_irq_chip_data(d);
+
+               its_send_inv(its_dev, its_get_event_id(d));
+       } else {
+               struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
+               void __iomem *rdbase;
+
+               rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base;
+               writeq_relaxed(d->hwirq, rdbase + GICR_INVLPIR);
+       }
 }
 
 static void its_vlpi_set_doorbell(struct irq_data *d, bool enable)
@@ -2196,6 +2212,9 @@ static int its_vpe_set_vcpu_affinity(struct irq_data *d, 
void *vcpu_info)
 
 static struct irq_chip its_vpe_irq_chip = {
        .name                   = "GICv4-vpe",
+       .irq_mask               = its_mask_irq,
+       .irq_unmask             = its_unmask_irq,
+       .irq_eoi                = irq_chip_eoi_parent,
        .irq_set_affinity       = its_vpe_set_affinity,
        .irq_set_vcpu_affinity  = its_vpe_set_vcpu_affinity,
 };
-- 
2.1.4

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