[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen master] ARM: new VGIC: Add PRIORITY registers handlers
commit ee13c822288bab7aa48985c6cfacee505a05925e Author: Andre Przywara <andre.przywara@xxxxxxxxxx> AuthorDate: Wed Feb 7 15:53:20 2018 +0000 Commit: Stefano Stabellini <sstabellini@xxxxxxxxxx> CommitDate: Wed Mar 28 11:16:22 2018 -0700 ARM: new VGIC: Add PRIORITY registers handlers The priority register handlers are shared between the v2 and v3 emulation, so their implementation goes into vgic-mmio.c, to be easily referenced from the v3 emulation as well later. This is based on Linux commit 055658bf48fc, written by Andre Przywara. Signed-off-by: Andre Przywara <andre.przywara@xxxxxxxxxx> Reviewed-by: Julien Grall <julien.grall@xxxxxxx> Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx> --- xen/arch/arm/vgic/vgic-mmio-v2.c | 2 +- xen/arch/arm/vgic/vgic-mmio.c | 47 ++++++++++++++++++++++++++++++++++++++++ xen/arch/arm/vgic/vgic-mmio.h | 7 ++++++ xen/arch/arm/vgic/vgic.h | 2 ++ 4 files changed, 57 insertions(+), 1 deletion(-) diff --git a/xen/arch/arm/vgic/vgic-mmio-v2.c b/xen/arch/arm/vgic/vgic-mmio-v2.c index 2f5d590b34..1f94c5ee2c 100644 --- a/xen/arch/arm/vgic/vgic-mmio-v2.c +++ b/xen/arch/arm/vgic/vgic-mmio-v2.c @@ -107,7 +107,7 @@ static const struct vgic_register_region vgic_v2_dist_registers[] = { vgic_mmio_read_active, vgic_mmio_write_cactive, 1, VGIC_ACCESS_32bit), REGISTER_DESC_WITH_BITS_PER_IRQ(GICD_IPRIORITYR, - vgic_mmio_read_raz, vgic_mmio_write_wi, 8, + vgic_mmio_read_priority, vgic_mmio_write_priority, 8, VGIC_ACCESS_32bit | VGIC_ACCESS_8bit), REGISTER_DESC_WITH_BITS_PER_IRQ(GICD_ITARGETSR, vgic_mmio_read_raz, vgic_mmio_write_wi, 8, diff --git a/xen/arch/arm/vgic/vgic-mmio.c b/xen/arch/arm/vgic/vgic-mmio.c index 5d4c599dcf..d5b898ec03 100644 --- a/xen/arch/arm/vgic/vgic-mmio.c +++ b/xen/arch/arm/vgic/vgic-mmio.c @@ -376,6 +376,53 @@ void vgic_mmio_write_sactive(struct vcpu *vcpu, } } +unsigned long vgic_mmio_read_priority(struct vcpu *vcpu, + paddr_t addr, unsigned int len) +{ + uint32_t intid = VGIC_ADDR_TO_INTID(addr, 8); + unsigned int i; + uint32_t val = 0; + + for ( i = 0; i < len; i++ ) + { + struct vgic_irq *irq = vgic_get_irq(vcpu->domain, vcpu, intid + i); + + val |= (uint32_t)irq->priority << (i * 8); + + vgic_put_irq(vcpu->domain, irq); + } + + return val; +} + +/* + * We currently don't handle changing the priority of an interrupt that + * is already pending on a VCPU. If there is a need for this, we would + * need to make this VCPU exit and re-evaluate the priorities, potentially + * leading to this interrupt getting presented now to the guest (if it has + * been masked by the priority mask before). + */ +void vgic_mmio_write_priority(struct vcpu *vcpu, + paddr_t addr, unsigned int len, + unsigned long val) +{ + uint32_t intid = VGIC_ADDR_TO_INTID(addr, 8); + unsigned int i; + unsigned long flags; + + for ( i = 0; i < len; i++ ) + { + struct vgic_irq *irq = vgic_get_irq(vcpu->domain, vcpu, intid + i); + + spin_lock_irqsave(&irq->irq_lock, flags); + /* Narrow the priority range to what we actually support */ + irq->priority = (val >> (i * 8)) & GENMASK(7, 8 - VGIC_PRI_BITS); + spin_unlock_irqrestore(&irq->irq_lock, flags); + + vgic_put_irq(vcpu->domain, irq); + } +} + static int match_region(const void *key, const void *elt) { const unsigned int offset = (unsigned long)key; diff --git a/xen/arch/arm/vgic/vgic-mmio.h b/xen/arch/arm/vgic/vgic-mmio.h index 832e2eb3d8..b2d572d562 100644 --- a/xen/arch/arm/vgic/vgic-mmio.h +++ b/xen/arch/arm/vgic/vgic-mmio.h @@ -119,6 +119,13 @@ void vgic_mmio_write_sactive(struct vcpu *vcpu, paddr_t addr, unsigned int len, unsigned long val); +unsigned long vgic_mmio_read_priority(struct vcpu *vcpu, + paddr_t addr, unsigned int len); + +void vgic_mmio_write_priority(struct vcpu *vcpu, + paddr_t addr, unsigned int len, + unsigned long val); + unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev); #endif diff --git a/xen/arch/arm/vgic/vgic.h b/xen/arch/arm/vgic/vgic.h index 2ccbd838d8..a60ef95867 100644 --- a/xen/arch/arm/vgic/vgic.h +++ b/xen/arch/arm/vgic/vgic.h @@ -25,6 +25,8 @@ #define VARIANT_ID_XEN 0x01 #define IMPLEMENTER_ARM 0x43b +#define VGIC_PRI_BITS 5 + #define vgic_irq_is_sgi(intid) ((intid) < VGIC_NR_SGIS) static inline bool irq_is_pending(struct vgic_irq *irq) -- generated by git-patchbot for /home/xen/git/xen.git#master _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/xen-changelog
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