Re: [PATCH v2] udmabuf: add vmap method to udmabuf_ops

[Dmitry Osipenko]

On 11/13/22 18:05, Lukasz Wiecaszek wrote:
> +static int vmap_udmabuf(struct dma_buf *buf, struct iosys_map *map)
> +{
> +	struct udmabuf *ubuf = buf->priv;
> +
> +	if (!ubuf->vaddr) {
> +		ubuf->vaddr = vm_map_ram(ubuf->pages, ubuf->pagecount, -1);
> +		if (!ubuf->vaddr)
> +			return -EINVAL;
> +	}

Create a new mapping on each vmap_udmabuf() and add the corresponding
vunmap.

Otherwise persistent vmapping shall be released together with udmabuf.
It doesn't look that persistent vmapping is needed for udmabufs.

-- 
Best regards,
Dmitry