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Commit dc524619 authored by Eric Auger's avatar Eric Auger Committed by Marc Zyngier
Browse files

KVM: arm/arm64: Helper to locate free rdist index 



We introduce vgic_v3_rdist_free_slot to help identifying
where we can place a new 2x64KB redistributor.

Signed-off-by: default avatarEric Auger <eric.auger@redhat.com>
Reviewed-by: default avatarChristoffer Dall <christoffer.dall@arm.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent dbd9733a

virt/kvm/arm/vgic/vgic-mmio-v3.c

+1 −2
Original line number Original line Diff line number Diff line
@@ -593,8 +593,7 @@ int vgic_register_redist_iodev(struct kvm_vcpu *vcpu) 
	 * function for all VCPUs when the base address is set.  Just return

	 * function for all VCPUs when the base address is set.  Just return

	 * without doing any work for now.

	 * without doing any work for now.

	 */

	 */

	rdreg = list_first_entry(&vgic->rd_regions,

	rdreg = vgic_v3_rdist_free_slot(&vgic->rd_regions);

				 struct vgic_redist_region, list);

	if (!rdreg)

	if (!rdreg)

		return 0;

		return 0;

virt/kvm/arm/vgic/vgic-v3.c

+23 −0
Original line number Original line Diff line number Diff line
@@ -453,6 +453,29 @@ bool vgic_v3_check_base(struct kvm *kvm) 
	return false;

	return false;

}

}





/**

 * vgic_v3_rdist_free_slot - Look up registered rdist regions and identify one

 * which has free space to put a new rdist region.

 *

 * @rd_regions: redistributor region list head

 *

 * A redistributor regions maps n redistributors, n = region size / (2 x 64kB).

 * Stride between redistributors is 0 and regions are filled in the index order.

 *

 * Return: the redist region handle, if any, that has space to map a new rdist

 * region.

 */

struct vgic_redist_region *vgic_v3_rdist_free_slot(struct list_head *rd_regions)

{

	struct vgic_redist_region *rdreg;



	list_for_each_entry(rdreg, rd_regions, list) {

		if (!vgic_v3_redist_region_full(rdreg))

			return rdreg;

	}

	return NULL;

}



int vgic_v3_map_resources(struct kvm *kvm)

int vgic_v3_map_resources(struct kvm *kvm)

{

{

	int ret = 0;

	int ret = 0;

virt/kvm/arm/vgic/vgic.h

+11 −0
Original line number Original line Diff line number Diff line
@@ -265,6 +265,17 @@ static inline int vgic_v3_max_apr_idx(struct kvm_vcpu *vcpu) 
	}

	}

}

}





static inline bool

vgic_v3_redist_region_full(struct vgic_redist_region *region)

{

	if (!region->count)

		return false;



	return (region->free_index >= region->count);

}



struct vgic_redist_region *vgic_v3_rdist_free_slot(struct list_head *rdregs);



int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,

int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,

			 u32 devid, u32 eventid, struct vgic_irq **irq);

			 u32 devid, u32 eventid, struct vgic_irq **irq);

struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi);

struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi);