Re: [PATCH v5 12/23] irqchip/gic-v4.1: Plumb set_vcpu_affinity SGI callbacks

Auger Eric
2020-03-17T10:35:25Z

Hi Marc,

On 3/4/20 9:33 PM, Marc Zyngier wrote:
> Just like for vLPIs, there is some configuration information that cannot
> be directly communicated through the normal irqchip API, and we have to
> use our good old friend set_vcpu_affinity as a side-band communication
> mechanism.
>
> This is used to configure group and priority for a given vSGI.
>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
> ---
> drivers/irqchip/irq-gic-v3-its.c | 18 ++++++++++++++++++
> include/linux/irqchip/arm-gic-v4.h | 5 +++++
> 2 files changed, 23 insertions(+)
>
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index fb2b836c31ff..effb0e0b0c9d 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -4033,6 +4033,23 @@ static int its_sgi_get_irqchip_state(struct irq_data *d,
> return 0;
> }
>
> +static int its_sgi_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
> +{
> + struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
> + struct its_cmd_info *info = vcpu_info;
> +
> + switch (info->cmd_type) {
> + case PROP_UPDATE_SGI:
PROP_UPDATE_VSGI directly?
> + vpe->sgi_config[d->hwirq].priority = info->priority;
> + vpe->sgi_config[d->hwirq].group = info->group;
> + its_configure_sgi(d, false);
> + return 0;
> +
extra line
> + default:
> + return -EINVAL;
> + }
> +}
> +
> static struct irq_chip its_sgi_irq_chip = {
> .name = "GICv4.1-sgi",
> .irq_mask = its_sgi_mask_irq,
> @@ -4040,6 +4057,7 @@ static struct irq_chip its_sgi_irq_chip = {
> .irq_set_affinity = its_sgi_set_affinity,
> .irq_set_irqchip_state = its_sgi_set_irqchip_state,
> .irq_get_irqchip_state = its_sgi_get_irqchip_state,
> + .irq_set_vcpu_affinity = its_sgi_set_vcpu_affinity,
> };
>
> static int its_sgi_irq_domain_alloc(struct irq_domain *domain,
> diff --git a/include/linux/irqchip/arm-gic-v4.h b/include/linux/irqchip/arm-gic-v4.h
> index 44e8c19e3d56..b4dbf899460b 100644
> --- a/include/linux/irqchip/arm-gic-v4.h
> +++ b/include/linux/irqchip/arm-gic-v4.h
> @@ -103,6 +103,7 @@ enum its_vcpu_info_cmd_type {
> SCHEDULE_VPE,
> DESCHEDULE_VPE,
> INVALL_VPE,
> + PROP_UPDATE_SGI,
> };
>
> struct its_cmd_info {
> @@ -115,6 +116,10 @@ struct its_cmd_info {
> bool g0en;
> bool g1en;
> };
> + struct {
> + u8 priority;
> + bool group;
> + };
> };
> };
>
>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Eric