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Date: Fri, 16 Dec 2022 11:59:18 +0800
From: Jason Wang <jasowang@...hat.com>
To: Xie Yongji <xieyongji@...edance.com>
Cc: mst@...hat.com, tglx@...utronix.de, hch@....de,
virtualization@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 04/11] vduse: Refactor allocation for vduse virtqueues
On Mon, Dec 5, 2022 at 4:44 PM Xie Yongji <xieyongji@...edance.com> wrote:
>
> Allocate memory for vduse virtqueues one by one instead of
> doing one allocation for all of them.
>
> This is a preparation for adding sysfs interface for virtqueues.
>
> Signed-off-by: Xie Yongji <xieyongji@...edance.com>
Acked-by: Jason Wang <jasowang@...hat.com>
Thanks
> ---
> drivers/vdpa/vdpa_user/vduse_dev.c | 98 ++++++++++++++++++++----------
> 1 file changed, 66 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
> index 35dceee3ed56..37809bfcb7ef 100644
> --- a/drivers/vdpa/vdpa_user/vduse_dev.c
> +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
> @@ -76,7 +76,7 @@ struct vduse_umem {
> struct vduse_dev {
> struct vduse_vdpa *vdev;
> struct device *dev;
> - struct vduse_virtqueue *vqs;
> + struct vduse_virtqueue **vqs;
> struct vduse_iova_domain *domain;
> char *name;
> struct mutex lock;
> @@ -434,7 +434,7 @@ static void vduse_dev_reset(struct vduse_dev *dev)
> flush_work(&dev->inject);
>
> for (i = 0; i < dev->vq_num; i++) {
> - struct vduse_virtqueue *vq = &dev->vqs[i];
> + struct vduse_virtqueue *vq = dev->vqs[i];
>
> vq->ready = false;
> vq->desc_addr = 0;
> @@ -466,7 +466,7 @@ static int vduse_vdpa_set_vq_address(struct vdpa_device *vdpa, u16 idx,
> u64 device_area)
> {
> struct vduse_dev *dev = vdpa_to_vduse(vdpa);
> - struct vduse_virtqueue *vq = &dev->vqs[idx];
> + struct vduse_virtqueue *vq = dev->vqs[idx];
>
> vq->desc_addr = desc_area;
> vq->driver_addr = driver_area;
> @@ -500,7 +500,7 @@ static void vduse_vq_kick_work(struct work_struct *work)
> static void vduse_vdpa_kick_vq(struct vdpa_device *vdpa, u16 idx)
> {
> struct vduse_dev *dev = vdpa_to_vduse(vdpa);
> - struct vduse_virtqueue *vq = &dev->vqs[idx];
> + struct vduse_virtqueue *vq = dev->vqs[idx];
>
> if (!eventfd_signal_allowed()) {
> schedule_work(&vq->kick);
> @@ -513,7 +513,7 @@ static void vduse_vdpa_set_vq_cb(struct vdpa_device *vdpa, u16 idx,
> struct vdpa_callback *cb)
> {
> struct vduse_dev *dev = vdpa_to_vduse(vdpa);
> - struct vduse_virtqueue *vq = &dev->vqs[idx];
> + struct vduse_virtqueue *vq = dev->vqs[idx];
>
> spin_lock(&vq->irq_lock);
> vq->cb.callback = cb->callback;
> @@ -524,7 +524,7 @@ static void vduse_vdpa_set_vq_cb(struct vdpa_device *vdpa, u16 idx,
> static void vduse_vdpa_set_vq_num(struct vdpa_device *vdpa, u16 idx, u32 num)
> {
> struct vduse_dev *dev = vdpa_to_vduse(vdpa);
> - struct vduse_virtqueue *vq = &dev->vqs[idx];
> + struct vduse_virtqueue *vq = dev->vqs[idx];
>
> vq->num = num;
> }
> @@ -533,7 +533,7 @@ static void vduse_vdpa_set_vq_ready(struct vdpa_device *vdpa,
> u16 idx, bool ready)
> {
> struct vduse_dev *dev = vdpa_to_vduse(vdpa);
> - struct vduse_virtqueue *vq = &dev->vqs[idx];
> + struct vduse_virtqueue *vq = dev->vqs[idx];
>
> vq->ready = ready;
> }
> @@ -541,7 +541,7 @@ static void vduse_vdpa_set_vq_ready(struct vdpa_device *vdpa,
> static bool vduse_vdpa_get_vq_ready(struct vdpa_device *vdpa, u16 idx)
> {
> struct vduse_dev *dev = vdpa_to_vduse(vdpa);
> - struct vduse_virtqueue *vq = &dev->vqs[idx];
> + struct vduse_virtqueue *vq = dev->vqs[idx];
>
> return vq->ready;
> }
> @@ -550,7 +550,7 @@ static int vduse_vdpa_set_vq_state(struct vdpa_device *vdpa, u16 idx,
> const struct vdpa_vq_state *state)
> {
> struct vduse_dev *dev = vdpa_to_vduse(vdpa);
> - struct vduse_virtqueue *vq = &dev->vqs[idx];
> + struct vduse_virtqueue *vq = dev->vqs[idx];
>
> if (dev->driver_features & BIT_ULL(VIRTIO_F_RING_PACKED)) {
> vq->state.packed.last_avail_counter =
> @@ -569,7 +569,7 @@ static int vduse_vdpa_get_vq_state(struct vdpa_device *vdpa, u16 idx,
> struct vdpa_vq_state *state)
> {
> struct vduse_dev *dev = vdpa_to_vduse(vdpa);
> - struct vduse_virtqueue *vq = &dev->vqs[idx];
> + struct vduse_virtqueue *vq = dev->vqs[idx];
>
> if (dev->driver_features & BIT_ULL(VIRTIO_F_RING_PACKED))
> return vduse_dev_get_vq_state_packed(dev, vq, &state->packed);
> @@ -624,8 +624,8 @@ static u16 vduse_vdpa_get_vq_num_max(struct vdpa_device *vdpa)
> int i;
>
> for (i = 0; i < dev->vq_num; i++)
> - if (num_max < dev->vqs[i].num_max)
> - num_max = dev->vqs[i].num_max;
> + if (num_max < dev->vqs[i]->num_max)
> + num_max = dev->vqs[i]->num_max;
>
> return num_max;
> }
> @@ -863,7 +863,7 @@ static int vduse_kickfd_setup(struct vduse_dev *dev,
> return -EINVAL;
>
> index = array_index_nospec(eventfd->index, dev->vq_num);
> - vq = &dev->vqs[index];
> + vq = dev->vqs[index];
> if (eventfd->fd >= 0) {
> ctx = eventfd_ctx_fdget(eventfd->fd);
> if (IS_ERR(ctx))
> @@ -889,7 +889,7 @@ static bool vduse_dev_is_ready(struct vduse_dev *dev)
> int i;
>
> for (i = 0; i < dev->vq_num; i++)
> - if (!dev->vqs[i].num_max)
> + if (!dev->vqs[i]->num_max)
> return false;
>
> return true;
> @@ -1130,7 +1130,7 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
> break;
>
> index = array_index_nospec(config.index, dev->vq_num);
> - dev->vqs[index].num_max = config.max_size;
> + dev->vqs[index]->num_max = config.max_size;
> ret = 0;
> break;
> }
> @@ -1148,7 +1148,7 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
> break;
>
> index = array_index_nospec(vq_info.index, dev->vq_num);
> - vq = &dev->vqs[index];
> + vq = dev->vqs[index];
> vq_info.desc_addr = vq->desc_addr;
> vq_info.driver_addr = vq->driver_addr;
> vq_info.device_addr = vq->device_addr;
> @@ -1198,7 +1198,7 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
> break;
>
> index = array_index_nospec(index, dev->vq_num);
> - ret = vduse_dev_queue_irq_work(dev, &dev->vqs[index].inject);
> + ret = vduse_dev_queue_irq_work(dev, &dev->vqs[index]->inject);
> break;
> }
> case VDUSE_IOTLB_REG_UMEM: {
> @@ -1339,6 +1339,49 @@ static const struct file_operations vduse_dev_fops = {
> .llseek = noop_llseek,
> };
>
> +static void vduse_dev_deinit_vqs(struct vduse_dev *dev)
> +{
> + int i;
> +
> + if (!dev->vqs)
> + return;
> +
> + for (i = 0; i < dev->vq_num; i++)
> + kfree(dev->vqs[i]);
> + kfree(dev->vqs);
> +}
> +
> +static int vduse_dev_init_vqs(struct vduse_dev *dev, u32 vq_align, u32 vq_num)
> +{
> + int i;
> +
> + dev->vq_align = vq_align;
> + dev->vq_num = vq_num;
> + dev->vqs = kcalloc(dev->vq_num, sizeof(*dev->vqs), GFP_KERNEL);
> + if (!dev->vqs)
> + return -ENOMEM;
> +
> + for (i = 0; i < vq_num; i++) {
> + dev->vqs[i] = kzalloc(sizeof(*dev->vqs[i]), GFP_KERNEL);
> + if (!dev->vqs[i])
> + goto err;
> +
> + dev->vqs[i]->index = i;
> + INIT_WORK(&dev->vqs[i]->inject, vduse_vq_irq_inject);
> + INIT_WORK(&dev->vqs[i]->kick, vduse_vq_kick_work);
> + spin_lock_init(&dev->vqs[i]->kick_lock);
> + spin_lock_init(&dev->vqs[i]->irq_lock);
> + }
> +
> + return 0;
> +err:
> + while (i--)
> + kfree(dev->vqs[i]);
> + kfree(dev->vqs);
> + dev->vqs = NULL;
> + return -ENOMEM;
> +}
> +
> static struct vduse_dev *vduse_dev_create(void)
> {
> struct vduse_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
> @@ -1396,7 +1439,7 @@ static int vduse_destroy_dev(char *name)
> device_destroy(vduse_class, MKDEV(MAJOR(vduse_major), dev->minor));
> idr_remove(&vduse_idr, dev->minor);
> kvfree(dev->config);
> - kfree(dev->vqs);
> + vduse_dev_deinit_vqs(dev);
> vduse_domain_destroy(dev->domain);
> kfree(dev->name);
> vduse_dev_destroy(dev);
> @@ -1483,7 +1526,7 @@ ATTRIBUTE_GROUPS(vduse_dev);
> static int vduse_create_dev(struct vduse_dev_config *config,
> void *config_buf, u64 api_version)
> {
> - int i, ret;
> + int ret;
> struct vduse_dev *dev;
>
> ret = -EEXIST;
> @@ -1510,19 +1553,10 @@ static int vduse_create_dev(struct vduse_dev_config *config,
>
> dev->config = config_buf;
> dev->config_size = config->config_size;
> - dev->vq_align = config->vq_align;
> - dev->vq_num = config->vq_num;
> - dev->vqs = kcalloc(dev->vq_num, sizeof(*dev->vqs), GFP_KERNEL);
> - if (!dev->vqs)
> - goto err_vqs;
>
> - for (i = 0; i < dev->vq_num; i++) {
> - dev->vqs[i].index = i;
> - INIT_WORK(&dev->vqs[i].inject, vduse_vq_irq_inject);
> - INIT_WORK(&dev->vqs[i].kick, vduse_vq_kick_work);
> - spin_lock_init(&dev->vqs[i].kick_lock);
> - spin_lock_init(&dev->vqs[i].irq_lock);
> - }
> + ret = vduse_dev_init_vqs(dev, config->vq_align, config->vq_num);
> + if (ret)
> + goto err_vqs;
>
> ret = idr_alloc(&vduse_idr, dev, 1, VDUSE_DEV_MAX, GFP_KERNEL);
> if (ret < 0)
> @@ -1543,7 +1577,7 @@ static int vduse_create_dev(struct vduse_dev_config *config,
> err_dev:
> idr_remove(&vduse_idr, dev->minor);
> err_idr:
> - kfree(dev->vqs);
> + vduse_dev_deinit_vqs(dev);
> err_vqs:
> vduse_domain_destroy(dev->domain);
> err_domain:
> --
> 2.20.1
>
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