[Intel-gfx] [PATCH] drm/i915: Pass DMA_ATTR_NO_WARN to dma_map_sg()

[Matthew Auld]

On 4 January 2018 at 16:38, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> In some iommu, e.g. swiotlb, the available space can be quite limited.
> So we employ a trial-and-error approach to seeing if our large
> contiguous chunks can fit, and if that fails we try again with smaller
> chunks after trying to free our own lazily allocated blobs. As we use a
> trial-and-error approach, we do not want dma_map_sg() to emit a WARN of
> its own accord, we want to gracefully report the error back to the caller
> instead.
>
> Note that our noisy culprit, swiotlb, doesn't honour the flag, yet.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Matthew Auld <matthew.auld at intel.com>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>