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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Minios-devel] [UNIKRAFT PATCH v2 06/12] plat/drivers: Configure virtio block queue
Hi Roxana
> -----Original Message-----
> From: Minios-devel <minios-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf
> Of Roxana Nicolescu
> Sent: Wednesday, October 30, 2019 6:46 PM
> To: minios-devel@xxxxxxxxxxxxx
> Cc: sharan.santhanam@xxxxxxxxx
> Subject: [Minios-devel] [UNIKRAFT PATCH v2 06/12] plat/drivers: Configure
> virtio block queue
>
> This patch introduces the initialization of the virtqueue used for
> communication to Backend.
>
> Signed-off-by: Roxana Nicolescu <nicolescu.roxana1996@xxxxxxxxx>
> ---
> plat/drivers/include/virtio/virtio_blk.h | 6 +
> plat/drivers/virtio/virtio_blk.c | 203 +++++++++++++++++++++++
> 2 files changed, 209 insertions(+)
>
> diff --git a/plat/drivers/include/virtio/virtio_blk.h
> b/plat/drivers/include/virtio/virtio_blk.h
> index 0efb5ba9..4877e404 100644
> --- a/plat/drivers/include/virtio/virtio_blk.h
> +++ b/plat/drivers/include/virtio/virtio_blk.h
> @@ -39,6 +39,8 @@
> #include <virtio/virtio_types.h>
>
> /* Feature bits */
> +#define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum
> segment size */
> +#define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of
> segments */
> #define VIRTIO_BLK_F_RO 5 /* Disk is read-only */
> #define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is
> available*/
> #define VIRTIO_BLK_F_MQ 12 /* support more than one vq
> */
> @@ -46,6 +48,10 @@
> struct virtio_blk_config {
> /* The capacity (in 512-byte sectors). */
> __u64 capacity;
> + /* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */
> + __u32 size_max;
> + /* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
> + __u32 seg_max;
>
> /* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */
> __u32 blk_size;
> diff --git a/plat/drivers/virtio/virtio_blk.c
> b/plat/drivers/virtio/virtio_blk.c
> index 4346104f..8da4edc3 100644
> --- a/plat/drivers/virtio/virtio_blk.c
> +++ b/plat/drivers/virtio/virtio_blk.c
> @@ -29,6 +29,7 @@
> #include <virtio/virtio_ids.h>
> #include <uk/blkdev.h>
> #include <virtio/virtio_blk.h>
> +#include <uk/sglist.h>
> #include <uk/blkdev_driver.h>
>
> #define DRIVER_NAME "virtio-blk"
> @@ -41,10 +42,13 @@
> * Access Mode
> * Sector_size;
> * Multi-queue,
> + * Maximum size of a segment for requests,
> + * Maximum number of segments per request,
> **/
> #define VIRTIO_BLK_DRV_FEATURES(features) \
> (VIRTIO_FEATURES_UPDATE(features, VIRTIO_BLK_F_RO | \
> VIRTIO_BLK_F_BLK_SIZE | VIRTIO_BLK_F_MQ | \
> + VIRTIO_BLK_F_SEG_MAX | VIRTIO_BLK_F_SIZE_MAX | \
>
> static struct uk_alloc *a;
> static const char *drv_name = DRIVER_NAME;
> @@ -64,6 +68,10 @@ struct virtio_blk_device {
> __u16 nb_queues;
> /* List of queues */
> struct uk_blkdev_queue *qs;
> + /* Maximum number of segments for a request */
> + __u32 max_segments;
> + /* Maximum size of a segment */
> + __u32 max_size_segment;
> };
>
> struct uk_blkdev_queue {
> @@ -76,11 +84,164 @@ struct uk_blkdev_queue {
> struct uk_alloc *a;
> /* The nr. of descriptor limit */
> uint16_t max_nb_desc;
> + /* The nr. of descriptor user configured */
> + uint16_t nb_desc;
> /* Reference to virtio_blk_device */
> struct virtio_blk_device *vbd;
> + /* The scatter list and its associated fragments */
> + struct uk_sglist sg;
> + struct uk_sglist_seg *sgsegs;
> };
>
>
> +static int virtio_blkdev_recv_done(struct virtqueue *vq, void *priv)
> +{
> + struct uk_blkdev_queue *queue = NULL;
> +
> + UK_ASSERT(vq && priv);
> +
> + queue = (struct uk_blkdev_queue *) priv;
> +
> + uk_blkdev_drv_queue_event(&queue->vbd->blkdev, queue-
> >lqueue_id);
> +
> + return 1;
> +}
> +
> +/**
> + * This function setup the vring infrastructure.
> + */
> +static int virtio_blkdev_vqueue_setup(struct uk_blkdev_queue *queue,
> + uint16_t nr_desc)
> +{
> + uint16_t max_desc;
> + struct virtqueue *vq;
> +
> + UK_ASSERT(queue);
> + max_desc = queue->max_nb_desc;
> + if (unlikely(max_desc < nr_desc)) {
> + uk_pr_err("Max desc: %"__PRIu16" Requested
> desc:%"__PRIu16"\n",
> + max_desc, nr_desc);
> + return -ENOBUFS;
> + }
> +
> + nr_desc = (nr_desc) ? nr_desc : max_desc;
> + uk_pr_debug("Configuring the %d descriptors\n", nr_desc);
> +
> + /* Check if the descriptor is a power of 2 */
> + if (unlikely(nr_desc & (nr_desc - 1))) {
> + uk_pr_err("Expected descriptor count as a power 2\n");
> + return -EINVAL;
> + }
> +
> + vq = virtio_vqueue_setup(queue->vbd->vdev, queue->lqueue_id,
> nr_desc,
> + virtio_blkdev_recv_done, a);
> + if (unlikely(PTRISERR(vq))) {
> + uk_pr_err("Failed to set up virtqueue %"__PRIu16"\n",
> + queue->lqueue_id);
> + return PTR2ERR(vq);
> + }
> +
> + queue->vq = vq;
> + vq->priv = queue;
> +
> + return 0;
> +}
> +
> +static struct uk_blkdev_queue *virtio_blkdev_queue_setup(struct
> uk_blkdev *dev,
> + uint16_t queue_id,
> + uint16_t nb_desc,
> + const struct uk_blkdev_queue_conf *queue_conf)
> +{
> + struct virtio_blk_device *vbdev;
> + int rc = 0;
> + struct uk_blkdev_queue *queue;
> +
> + UK_ASSERT(dev != NULL);
> + UK_ASSERT(queue_conf != NULL);
> +
> + vbdev = to_virtioblkdev(dev);
> + if (unlikely(queue_id >= vbdev->nb_queues)) {
> + uk_pr_err("Invalid queue_id %"__PRIu16"\n", queue_id);
> + rc = -EINVAL;
> + goto err_exit;
> + }
> +
> + queue = &vbdev->qs[queue_id];
> + queue->a = queue_conf->a;
> +
> + /* Init sglist */
> + queue->sgsegs = uk_malloc(queue->a,
> + vbdev->max_segments * sizeof(*queue->sgsegs));
> + if (unlikely(!queue->sgsegs)) {
> + rc = -ENOMEM;
> + goto err_exit;
> + }
> +
> + uk_sglist_init(&queue->sg, vbdev->max_segments,
> + queue->sgsegs);
> + queue->vbd = vbdev;
> + queue->nb_desc = nb_desc;
> + queue->lqueue_id = queue_id;
> +
> + /* Setup the virtqueue with the descriptor */
> + rc = virtio_blkdev_vqueue_setup(queue, nb_desc);
> + if (rc < 0) {
> + uk_pr_err("Failed to set up virtqueue %"__PRIu16": %d\n",
> + queue_id, rc);
> + goto setup_err;
> + }
> +
> +exit:
> + return queue;
> +setup_err:
> + uk_free(queue->a, queue->sgsegs);
> +err_exit:
> + queue = ERR2PTR(rc);
> + goto exit;
> +}
> +
> +static int virtio_blkdev_queue_release(struct uk_blkdev *dev,
> + struct uk_blkdev_queue *queue)
> +{
> + struct virtio_blk_device *vbdev;
> + int rc = 0;
> +
> + UK_ASSERT(dev != NULL);
> + vbdev = to_virtioblkdev(dev);
> +
> + uk_free(queue->a, queue->sgsegs);
> + virtio_vqueue_release(vbdev->vdev, queue->vq, queue->a);
I can't find the definition of virtio_vqueue_release, am I missing some patches?
--
Cheers,
Justin (Jia He)
> +
> + return rc;
> +}
> +
> +static int virtio_blkdev_queue_info_get(struct uk_blkdev *dev,
> + uint16_t queue_id,
> + struct uk_blkdev_queue_info *qinfo)
> +{
> + struct virtio_blk_device *vbdev = NULL;
> + struct uk_blkdev_queue *queue = NULL;
> + int rc = 0;
> +
> + UK_ASSERT(dev);
> + UK_ASSERT(qinfo);
> +
> + vbdev = to_virtioblkdev(dev);
> + if (unlikely(queue_id >= vbdev->nb_queues)) {
> + uk_pr_err("Invalid queue_id %"__PRIu16"\n", queue_id);
> + rc = -EINVAL;
> + goto exit;
> + }
> +
> + queue = &vbdev->qs[queue_id];
> + qinfo->nb_min = queue->max_nb_desc;
> + qinfo->nb_max = queue->max_nb_desc;
> + qinfo->nb_is_power_of_two = 1;
> +
> +exit:
> + return rc;
> +}
> +
> static int virtio_blkdev_queues_alloc(struct virtio_blk_device *vbdev,
> const struct uk_blkdev_conf *conf)
> {
> @@ -177,6 +338,8 @@ static int virtio_blkdev_feature_negotiate(struct
> virtio_blk_device *vbdev)
> __sector sectors;
> __sector ssize;
> __u16 num_queues;
> + __u32 max_segments;
> + __u32 max_size_segment;
> int rc = 0;
>
> UK_ASSERT(vbdev);
> @@ -228,13 +391,50 @@ static int virtio_blkdev_feature_negotiate(struct
> virtio_blk_device *vbdev)
> }
> } else
> num_queues = 1;
> +
> + if (virtio_has_features(host_features, VIRTIO_BLK_F_SEG_MAX)) {
> + bytes_to_read = virtio_config_get(vbdev->vdev,
> + __offsetof(struct virtio_blk_config, seg_max),
> + &max_segments,
> + sizeof(max_segments),
> + 1);
> + if (bytes_to_read != sizeof(max_segments)) {
> + uk_pr_err("Failed to get maximum nb of
> segments\n");
> + rc = -EAGAIN;
> + goto exit;
> + }
> + } else
> + max_segments = 1;
> +
> + /* We need extra sg elements for head (header) and tail (status). */
> + max_segments += 2;
> +
> + if (virtio_has_features(host_features, VIRTIO_BLK_F_SIZE_MAX)) {
> + bytes_to_read = virtio_config_get(vbdev->vdev,
> + __offsetof(struct virtio_blk_config, size_max),
> + &max_size_segment,
> + sizeof(max_size_segment),
> + 1);
> + if (bytes_to_read != sizeof(max_size_segment)) {
> + uk_pr_err("Failed to get size max from device %d\n",
> + rc);
> + rc = -EAGAIN;
> + goto exit;
> + }
> + } else
> + max_size_segment = __PAGE_SIZE;
> +
> cap->ssize = ssize;
> cap->sectors = sectors;
> cap->ioalign = sizeof(void *);
> cap->mode = (virtio_has_features(
> host_features, VIRTIO_BLK_F_RO)) ? O_RDONLY :
> O_RDWR;
> + cap->max_sectors_per_req =
> + max_size_segment / ssize * (max_segments - 2);
>
> vbdev->max_vqueue_pairs = num_queues;
> + vbdev->max_segments = max_segments;
> + vbdev->max_size_segment = max_size_segment;
>
> /**
> * Mask out features supported by both driver and device.
> @@ -257,6 +457,9 @@ static inline void virtio_blkdev_feature_set(struct
> virtio_blk_device *vbdev)
> static const struct uk_blkdev_ops virtio_blkdev_ops = {
> .get_info = virtio_blkdev_get_info,
> .dev_configure = virtio_blkdev_configure,
> + .queue_get_info = virtio_blkdev_queue_info_get,
> + .queue_setup = virtio_blkdev_queue_setup,
> + .queue_release = virtio_blkdev_queue_release,
> .dev_unconfigure = virtio_blkdev_unconfigure,
> };
>
> --
> 2.17.1
>
>
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