drm/msm needs to recover the physical address behind a DMA address of imported dma-bufs: with CONFIG_DMABUF_DEBUG=y the attachment sg_table it hands to importers carries no struct page, and msm has to translate sg_dma_address() back to a physical address through the attaching device's DMA-API domain to map such buffers into its own pagetables (see the follow-up drm/msm patch).
Export the helper so modularized drivers can use it. Cc: Joerg Roedel <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Signed-off-by: Jianfeng Liu <[email protected]> --- drivers/iommu/iommu.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index cd1bca7ede9af..330f9a79248bd 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2327,6 +2327,7 @@ struct iommu_domain *iommu_get_dma_domain(struct device *dev) { return dev->iommu_group->default_domain; } +EXPORT_SYMBOL_GPL(iommu_get_dma_domain); static void *iommu_make_pasid_array_entry(struct iommu_domain *domain, struct iommu_attach_handle *handle) -- 2.47.3
