82e07602d2
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@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Matthew Auld <matthew.auld@intel.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180104163842.11635-1-chris@chris-wilson.co.uk |
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