On Wed, Jun 28, 2023 at 2:59 PM Cindy Lu <lulu@xxxxxxxxxx> wrote:
>
> From: Your Name <you@xxxxxxxxxxx>
>
> Add the function for get/free pages, ad this info
> will saved in dev->reconnect_info
I think this should be squashed to patch 2 otherwise it fixes a bug
that is introduced in patch 2?
>
> Signed-off-by: Cindy Lu <lulu@xxxxxxxxxx>
> ---
> drivers/vdpa/vdpa_user/vduse_dev.c | 35 ++++++++++++++++++++++++++++++
> 1 file changed, 35 insertions(+)
>
> diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
> index 1b833bf0ae37..3df1256eccb4 100644
> --- a/drivers/vdpa/vdpa_user/vduse_dev.c
> +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
> @@ -1313,6 +1313,35 @@ static struct vduse_dev *vduse_dev_get_from_minor(int minor)
> return dev;
> }
>
> +int vduse_get_vq_reconnnect(struct vduse_dev *dev, u16 idx)
> +{
> + struct vdpa_reconnect_info *area;
> + void *addr = (void *)get_zeroed_page(GFP_KERNEL);
> +
> + area = &dev->reconnect_info[idx];
> +
> + area->addr = virt_to_phys(addr);
> + area->vaddr = (unsigned long)addr;
> + area->size = PAGE_SIZE;
> + area->index = idx;
> +
> + return 0;
> +}
> +
> +int vduse_free_vq_reconnnect(struct vduse_dev *dev, u16 idx)
> +{
> + struct vdpa_reconnect_info *area;
> +
> + area = &dev->reconnect_info[idx];
> + if ((area->size == PAGE_SIZE) && (area->addr != NULL)) {
> + free_page(area->vaddr);
> + area->size = 0;
> + area->addr = 0;
> + area->vaddr = 0;
> + }
> +
> + return 0;
> +}
>
> static vm_fault_t vduse_vm_fault(struct vm_fault *vmf)
> {
> @@ -1446,6 +1475,10 @@ static int vduse_destroy_dev(char *name)
> mutex_unlock(&dev->lock);
> return -EBUSY;
> }
> + for (int i = 0; i < dev->vq_num; i++) {
> +
> + vduse_free_vq_reconnnect(dev, i);
> + }
> dev->connected = true;
> mutex_unlock(&dev->lock);
>
> @@ -1583,6 +1616,8 @@ static int vduse_create_dev(struct vduse_dev_config *config,
> 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);
> +
> + vduse_get_vq_reconnnect(dev, i);
Can we delay the allocated until fault?
Thanks
> }
>
> ret = idr_alloc(&vduse_idr, dev, 1, VDUSE_DEV_MAX, GFP_KERNEL);
> --
> 2.34.3
>
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