[Intel-gfx] [PATCH v3] drm/i915: Implement dma-buf mmap() for userspace access
Daniel Vetter
daniel at ffwll.ch
Thu Jun 19 14:37:01 CEST 2014
On Thu, Jun 19, 2014 at 03:34:34PM +0300, Ander Conselvan de Oliveira wrote:
> From: Rob Bradford <rob at linux.intel.com>
>
> The aim is that this is functionally equivalent to using the
> I915_GEM_MMAP ioctl.
>
> v2: Add aperture check limit, limit to SNB+ and improve error handling.
>
> v3 (anderco): Map without using the GTT.
Why that? This means you'll have a non-coherent mapping and atm dma-buf
doesn't expose and invalidate/flushing ioctls. Which really you want for
this.
-Daniel
>
> Signed-off-by: Rob Bradford <rob at linux.intel.com>
> Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com>
> ---
> drivers/gpu/drm/i915/i915_gem_dmabuf.c | 19 ++++++++++++++++++-
> 1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
> index 580aa42..2d31fca 100644
> --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c
> +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
> @@ -193,7 +193,24 @@ static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_n
>
> static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
> {
> - return -EINVAL;
> + struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
> + struct drm_device *dev = obj->base.dev;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + int ret;
> +
> + if (INTEL_INFO(dev)->gen < 6)
> + return -EINVAL;
> +
> + ret = i915_mutex_lock_interruptible(dev);
> + if (ret)
> + return ret;
> +
> + ret = obj->base.filp->f_op->mmap(obj->base.filp, vma);
> + fput(vma->vm_file);
> + vma->vm_file = get_file(obj->base.filp);
> +
> + mutex_unlock(&dev->struct_mutex);
> + return ret;
> }
>
> static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t length, enum dma_data_direction direction)
> --
> 1.8.3.2
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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