[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 43/57] ARM: new VGIC: Add SGIR register handler
Triggering an IPI via this register is v2 specific, so the implementation lives entirely in vgic-mmio-v2.c. This is based on Linux commit 55cc01fb9004, written by Andre Przywara. Signed-off-by: Andre Przywara <andre.przywara@xxxxxxxxxx> --- Changelog RFC ... v1: - use symbolic names instead of magic values - iterates over set bits instead of every VCPU xen/arch/arm/vgic/vgic-mmio-v2.c | 47 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 45 insertions(+), 2 deletions(-) diff --git a/xen/arch/arm/vgic/vgic-mmio-v2.c b/xen/arch/arm/vgic/vgic-mmio-v2.c index 01c6a7198c..5f1fdb9a70 100644 --- a/xen/arch/arm/vgic/vgic-mmio-v2.c +++ b/xen/arch/arm/vgic/vgic-mmio-v2.c @@ -72,6 +72,49 @@ static void vgic_mmio_write_v2_misc(struct vcpu *vcpu, } } +static void vgic_mmio_write_sgir(struct vcpu *source_vcpu, + paddr_t addr, unsigned int len, + unsigned long val) +{ + struct domain *d = source_vcpu->domain; + unsigned int nr_vcpus = d->max_vcpus; + unsigned int intid = val & GICD_SGI_INTID_MASK; + unsigned long targets = (val & GICD_SGI_TARGET_MASK) >> + GICD_SGI_TARGET_SHIFT; + unsigned int vcpu_id; + + switch ( val & GICD_SGI_TARGET_LIST_MASK ) + { + case GICD_SGI_TARGET_LIST: /* as specified by targets */ + targets &= GENMASK(nr_vcpus, 0); /* limit to existing VCPUs */ + break; + case GICD_SGI_TARGET_OTHERS: + targets = GENMASK(nr_vcpus, 0); /* all, ... */ + targets &= ~(1U << source_vcpu->vcpu_id); /* but self */ + break; + case GICD_SGI_TARGET_SELF: /* this very vCPU only */ + targets = (1U << source_vcpu->vcpu_id); + break; + case 0x3: /* reserved */ + return; + } + + for_each_set_bit( vcpu_id, &targets, 8 ) + { + struct vcpu *vcpu = d->vcpu[vcpu_id]; + struct vgic_irq *irq = vgic_get_irq(d, vcpu, intid); + unsigned long flags; + + spin_lock_irqsave(&irq->irq_lock, flags); + + irq->pending_latch = true; + irq->source |= 1U << source_vcpu->vcpu_id; + + vgic_queue_irq_unlock(d, irq, flags); + vgic_put_irq(d, irq); + } +} + static unsigned long vgic_mmio_read_target(struct vcpu *vcpu, paddr_t addr, unsigned int len) { @@ -128,7 +171,7 @@ static void vgic_mmio_write_target(struct vcpu *vcpu, spin_unlock_irqrestore(&irq->irq_lock, flags); if ( desc ) - vgic_update_hardware_irq(desc, irq); + vgic_sync_hardware_irq(vcpu->domain, desc, irq); vgic_put_irq(vcpu->domain, irq); } @@ -169,7 +212,7 @@ static const struct vgic_register_region vgic_v2_dist_registers[] = { vgic_mmio_read_config, vgic_mmio_write_config, 2, VGIC_ACCESS_32bit), REGISTER_DESC_WITH_LENGTH(GICD_SGIR, - vgic_mmio_read_raz, vgic_mmio_write_wi, 4, + vgic_mmio_read_raz, vgic_mmio_write_sgir, 4, VGIC_ACCESS_32bit), REGISTER_DESC_WITH_LENGTH(GICD_CPENDSGIR, vgic_mmio_read_raz, vgic_mmio_write_wi, 16, -- 2.14.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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