From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752942AbeC0OEh (ORCPT ); Tue, 27 Mar 2018 10:04:37 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:52520 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752865AbeC0OEd (ORCPT ); Tue, 27 Mar 2018 10:04:33 -0400 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, marc.zyngier@arm.com, cdall@kernel.org, peter.maydell@linaro.org Cc: andre.przywara@arm.com, drjones@redhat.com, wei@redhat.com Subject: [RFC v2 04/12] KVM: arm/arm64: Helper to locate free rdist index Date: Tue, 27 Mar 2018 16:04:08 +0200 Message-Id: <1522159456-10419-5-git-send-email-eric.auger@redhat.com> In-Reply-To: <1522159456-10419-1-git-send-email-eric.auger@redhat.com> References: <1522159456-10419-1-git-send-email-eric.auger@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We introduce vgic_v3_rdist_free_slot to help identifying where we can place a new 2x64KB redistributor. Signed-off-by: Eric Auger --- virt/kvm/arm/vgic/vgic-mmio-v3.c | 3 +-- virt/kvm/arm/vgic/vgic-v3.c | 17 +++++++++++++++++ virt/kvm/arm/vgic/vgic.h | 11 +++++++++++ 3 files changed, 29 insertions(+), 2 deletions(-) diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c index d1aab18..49ca176 100644 --- a/virt/kvm/arm/vgic/vgic-mmio-v3.c +++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c @@ -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 * without doing any work for now. */ - rdreg = list_first_entry(&vgic->rd_regions, - struct vgic_redist_region, list); + rdreg = vgic_v3_rdist_free_slot(&vgic->rd_regions); if (!rdreg) return 0; diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index 7e696e6..6a7e4065 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -438,6 +438,23 @@ bool vgic_v3_check_base(struct kvm *kvm) return false; } +/** + * vgic_v3_rdist_free_slot - Look up registered rdist regions and identify one + * which has free space to put a new rdist regions + * + * If any, return this redist region handle, otherwise returns NULL. + */ +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 ret = 0; diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h index f5b8519..d5e89b8 100644 --- a/virt/kvm/arm/vgic/vgic.h +++ b/virt/kvm/arm/vgic/vgic.h @@ -248,6 +248,17 @@ 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, u32 devid, u32 eventid, struct vgic_irq **irq); struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi); -- 2.5.5