From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54180) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f3hx5-0001AL-Bf for qemu-devel@nongnu.org; Wed, 04 Apr 2018 08:55:51 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f3hx1-0005ZB-6y for qemu-devel@nongnu.org; Wed, 04 Apr 2018 08:55:47 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:44930 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1f3hx0-0005Yk-O8 for qemu-devel@nongnu.org; Wed, 04 Apr 2018 08:55:42 -0400 From: wexu@redhat.com Date: Wed, 4 Apr 2018 20:53:58 +0800 Message-Id: <1522846444-31725-3-git-send-email-wexu@redhat.com> In-Reply-To: <1522846444-31725-1-git-send-email-wexu@redhat.com> References: <1522846444-31725-1-git-send-email-wexu@redhat.com> Subject: [Qemu-devel] [PATCH 2/8] virtio: memory cache for packed ring List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: wexu@redhat.com, jasowang@redhat.com, mst@redhat.com, tiwei.bie@intel.com, jfreimann@redhat.com, qemu-devel@nongnu.org From: Wei Xu A new memory cache is introduced to for packed ring, the code looks pretty duplicated with split(1.0) ring, any refactor idea? Signed-off-by: Wei Xu --- hw/virtio/virtio.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 76 insertions(+), 3 deletions(-) diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 9a6bfe7..73a35a4 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -155,13 +155,15 @@ static void virtio_free_region_cache(VRingMemoryRegionCaches *caches) return; } + /* FIX ME: pass in 1.1 device here, reuse 1.0 fields at current */ + address_space_cache_destroy(&caches->desc); address_space_cache_destroy(&caches->avail); address_space_cache_destroy(&caches->used); g_free(caches); } -static void virtio_init_region_cache(VirtIODevice *vdev, int n) +static void virtio_init_region_cache_split(VirtIODevice *vdev, int n) { VirtQueue *vq = &vdev->vq[n]; VRingMemoryRegionCaches *old = vq->vring.caches; @@ -215,6 +217,65 @@ err_desc: g_free(new); } +static void virtio_init_region_cache_packed(VirtIODevice *vdev, int n) +{ + VirtQueue *vq = &vdev->vq[n]; + VRingMemoryRegionCaches *old = vq->vring.caches; + VRingMemoryRegionCaches *new; + hwaddr addr, size; + int64_t len; + + addr = vq->packed.desc; + if (!addr) { + return; + } + new = g_new0(VRingMemoryRegionCaches, 1); + size = virtio_queue_get_desc_size(vdev, n); + len = address_space_cache_init(&new->desc_packed, vdev->dma_as, + addr, size, false); + if (len < size) { + virtio_error(vdev, "Cannot map desc"); + goto err_desc; + } + + size = sizeof(struct VRingPackedDescEvent); + len = address_space_cache_init(&new->driver, vdev->dma_as, + vq->packed.driver, size, true); + if (len < size) { + virtio_error(vdev, "Cannot map driver area"); + goto err_driver; + } + + len = address_space_cache_init(&new->device, vdev->dma_as, + vq->packed.device, size, true); + if (len < size) { + virtio_error(vdev, "Cannot map device area"); + goto err_device; + } + + atomic_rcu_set(&vq->packed.caches, new); + if (old) { + call_rcu(old, virtio_free_region_cache, rcu); + } + return; + +err_device: + address_space_cache_destroy(&new->driver); +err_driver: + address_space_cache_destroy(&new->desc); +err_desc: + g_free(new); +} + +static void virtio_init_region_cache(VirtIODevice *vdev, int n) +{ + if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { + virtio_init_region_cache_packed(vdev, n); + } else { + virtio_init_region_cache_split(vdev, n); + } +} + /* virt queue functions */ void virtio_queue_update_rings(VirtIODevice *vdev, int n) { @@ -245,10 +306,18 @@ static void vring_desc_read(VirtIODevice *vdev, VRingDesc *desc, static VRingMemoryRegionCaches *vring_get_region_caches(struct VirtQueue *vq) { - VRingMemoryRegionCaches *caches = atomic_rcu_read(&vq->vring.caches); + VRingMemoryRegionCaches *caches; + + if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { + caches = atomic_rcu_read(&vq->packed.caches); + } else { + caches = atomic_rcu_read(&vq->vring.caches); + } + assert(caches != NULL); return caches; } + /* Called within rcu_read_lock(). */ static inline uint16_t vring_avail_flags(VirtQueue *vq) { @@ -2331,7 +2400,11 @@ hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n) hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n) { - return sizeof(VRingDesc) * vdev->vq[n].vring.num; + if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { + return sizeof(VRingDescPacked) * vdev->vq[n].packed.num; + } else { + return sizeof(VRingDesc) * vdev->vq[n].vring.num; + } } hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n) -- 2.7.4