From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Stabellini Subject: [PATCH-4.5 v2 04/10] xen/arm: set GICH_HCR_UIE if all the LRs are in use Date: Fri, 14 Feb 2014 15:51:32 +0000 Message-ID: <1392393098-7351-4-git-send-email-stefano.stabellini@eu.citrix.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xensource.com Cc: julien.grall@citrix.com, Ian.Campbell@citrix.com, Stefano Stabellini List-Id: xen-devel@lists.xenproject.org On return to guest, if there are no free LRs and we still have more interrupt to inject, set GICH_HCR_UIE so that we are going to receive a maintenance interrupt when no pending interrupts are present in the LR registers. The maintenance interrupt handler won't do anything anymore, but receiving the interrupt is going to cause gic_inject to be called on return to guest that is going to clear the old LRs and inject new interrupts. Signed-off-by: Stefano Stabellini --- Changes in v2: - disable/enable the GICH_HCR_UIE bit in GICH_HCR; - only enable GICH_HCR_UIE if this_cpu(lr_mask) == ((1 << nr_lrs) - 1). --- xen/arch/arm/gic.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c index ee383bc..0928aca 100644 --- a/xen/arch/arm/gic.c +++ b/xen/arch/arm/gic.c @@ -805,8 +805,15 @@ void gic_inject(void) gic_restore_pending_irqs(current); if (!gic_events_need_delivery()) gic_inject_irq_stop(); - else + else { gic_inject_irq_start(); + } + + if ( !list_empty(¤t->arch.vgic.lr_pending) && + this_cpu(lr_mask) == ((1 << nr_lrs) - 1) ) + GICH[GICH_HCR] |= GICH_HCR_UIE; + else + GICH[GICH_HCR] &= ~GICH_HCR_UIE; } int gic_route_irq_to_guest(struct domain *d, const struct dt_irq *irq, -- 1.7.10.4