From mboxrd@z Thu Jan 1 00:00:00 1970 From: eric.auger@redhat.com (Eric Auger) Date: Mon, 6 Mar 2017 12:34:28 +0100 Subject: [PATCH v3 13/19] KVM: arm64: ITS: Sort the device and ITE lists In-Reply-To: <1488800074-21991-1-git-send-email-eric.auger@redhat.com> References: <1488800074-21991-1-git-send-email-eric.auger@redhat.com> Message-ID: <1488800074-21991-14-git-send-email-eric.auger@redhat.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Natively sort the device and ITE lists in ascending deviceId/eventid order. This paves the way to optimized DTE and ITE scan in guest RAM table where entries are chained together using a next ID offset. Signed-off-by: Eric Auger --- virt/kvm/arm/vgic/vgic-its.c | 36 ++++++++++++++++++++++++++++++++++-- 1 file changed, 34 insertions(+), 2 deletions(-) diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index 9792110..1cd6ae6 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -734,6 +734,21 @@ static void vgic_its_free_collection(struct vgic_its *its, u32 coll_id) kfree(collection); } +static void ite_list_insert_sorted(struct list_head *h, struct its_ite *ite) +{ + struct list_head *pos = h->next; + u32 id = ite->event_id; + + while (pos != h) { + struct its_ite *iter = + list_entry(pos, struct its_ite, ite_list); + if (id < iter->event_id) + break; + pos = pos->next; + } + list_add_tail(&ite->ite_list, pos); +} + static int vgic_its_alloc_ite(struct its_device *device, struct its_ite **itep, struct its_collection *collection, @@ -749,7 +764,7 @@ static int vgic_its_alloc_ite(struct its_device *device, ite->collection = collection; ite->lpi = lpi_id; - list_add_tail(&ite->ite_list, &device->itt_head); + ite_list_insert_sorted(&device->itt_head, ite); *itep = ite; return 0; } @@ -842,6 +857,22 @@ static void vgic_its_unmap_device(struct kvm *kvm, struct its_device *device) kfree(device); } +static void device_list_insert_sorted(struct list_head *h, + struct its_device *dev) +{ + struct list_head *pos = h->next; + u32 id = dev->device_id; + + while (pos != h) { + struct its_device *iter = + list_entry(pos, struct its_device, dev_list); + if (id < iter->device_id) + break; + pos = pos->next; + } + list_add_tail(&dev->dev_list, pos); +} + static int vgic_its_alloc_device(struct vgic_its *its, struct its_device **devp, u32 device_id, gpa_t itt_addr_field, @@ -858,7 +889,8 @@ static int vgic_its_alloc_device(struct vgic_its *its, device->nb_eventid_bits = size_field + 1; INIT_LIST_HEAD(&device->itt_head); - list_add_tail(&device->dev_list, &its->device_list); + device_list_insert_sorted(&its->device_list, device); + *devp = device; return 0; -- 2.5.5