> +static inline bool dma_sg_kmalloc_needs_bounce(struct device *dev,
> + struct scatterlist *sg, int nents,
> + enum dma_data_direction dir)
> +{
> + struct scatterlist *s;
> + int i;
> +
> + if (!IS_ENABLED(CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC) ||
> + dir == DMA_TO_DEVICE || dev_is_dma_coherent(dev))
> + return false;
This part should be shared with dma-direct in a well documented helper.
> + for_each_sg(sg, s, nents, i) {
> + if (dma_kmalloc_needs_bounce(dev, s->length, dir))
> + return true;
> + }
And for this loop iteration I'd much prefer it to be out of line, and
also not available in a global helper.
But maybe someone can come up with a nice tweak to the dma-iommu
code to not require the extra sglist walk anyway.
