[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v5 25/30] ARM: vITS: handle DISCARD command
On Thu, 6 Apr 2017, Andre Przywara wrote: > The DISCARD command drops the connection between a DeviceID/EventID > and an LPI/collection pair. > We mark the respective structure entries as not allocated and make > sure that any queued IRQs are removed. > > Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx> > --- > xen/arch/arm/vgic-v3-its.c | 32 ++++++++++++++++++++++++++++++++ > 1 file changed, 32 insertions(+) > > diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c > index 6afb915..47f2884 100644 > --- a/xen/arch/arm/vgic-v3-its.c > +++ b/xen/arch/arm/vgic-v3-its.c > @@ -549,6 +549,35 @@ out_unlock: > return ret; > } > > +static int its_handle_discard(struct virt_its *its, uint64_t *cmdptr) > +{ > + uint32_t devid = its_cmd_get_deviceid(cmdptr); > + uint32_t eventid = its_cmd_get_id(cmdptr); > + struct pending_irq *pirq; > + struct vcpu *vcpu; > + uint32_t vlpi; > + > + if ( !read_itte(its, devid, eventid, &vcpu, &vlpi) ) > + return -1; > + > + pirq = its->d->arch.vgic.handler->lpi_to_pending(its->d, vlpi); > + if ( pirq ) > + { > + clear_bit(GIC_IRQ_GUEST_QUEUED, &pirq->status); > + gic_remove_from_queues(vcpu, vlpi); we need to remove it from inflight > + } > + > + if ( !write_itte(its, devid, eventid, UNMAPPED_COLLECTION, INVALID_LPI, > + NULL) ) > + return -1; > + > + if ( !gicv3_assign_guest_event(its->d, its->doorbell_address, > + devid, eventid, NULL, 0) ) > + return -1; > + > + return 0; > +} > + > #define ITS_CMD_BUFFER_SIZE(baser) ((((baser) & 0xff) + 1) << 12) > > /* > @@ -580,6 +609,9 @@ static int vgic_its_handle_cmds(struct domain *d, struct > virt_its *its) > case GITS_CMD_CLEAR: > ret = its_handle_clear(its, command); > break; > + case GITS_CMD_DISCARD: > + ret = its_handle_discard(its, command); > + break; > case GITS_CMD_INT: > ret = its_handle_int(its, command); > break; > -- > 2.8.2 > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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