[Linaro-mm-sig] Re: [PATCH v2] udmabuf: add vmap method to udmabuf_ops

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.