Hi Marc,
On 17/01/2017 11:20, Marc Zyngier wrote:
> 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
s/writting/writing
is DirectLPI always supported? I can see the GICR_TYPER advertises (or
not) the modality.
> redistributor.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
> ---
> 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);
nit: leave blank line (sorry I need to find something ;-)
> 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,
not documented in the commit msg?
Eric
> .irq_set_affinity = its_vpe_set_affinity,
> .irq_set_vcpu_affinity = its_vpe_set_vcpu_affinity,
> };
>
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