On Wed, Jan 31, 2018 at 02:03:42PM +0200, Alexey Skidanov wrote:
> Any driver may access shared buffers, created by ion, using dma_buf_vmap and
> dma_buf_vunmap dma-buf API that maps/unmaps previosuly allocated buffers into
> the kernel virtual address space. The implementation of these API is missing in
> the current ion implementation.
>
> Signed-off-by: Alexey Skidanov <alexey.skidanov@xxxxxxxxx>
> ---
No review from any other Intel developers? :(
Anyway, what in-tree driver needs access to these functions?
And are you sure that you don't need to do any "real" logic in the
vmap/vunmap calls? That feels like there would be some reference
counting problems here.
> drivers/staging/android/ion/ion.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
> index f480885..4f1dc7f 100644
> --- a/drivers/staging/android/ion/ion.c
> +++ b/drivers/staging/android/ion/ion.c
> @@ -327,6 +327,17 @@ static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset,
> {
> }
>
> +static void *ion_dma_buf_vmap(struct dma_buf *dmabuf)
> +{
> + struct ion_buffer *buffer = dmabuf->priv;
> +
> + return buffer->vaddr;
Just call ion_dma_buf_kmap(dmabuf, 0)?
Again, please get this reviewed by someone else in Intel first. Don't
ignore the resources you have, to do so would be foolish :)
thanks,
greg k-h
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