Devices that are forced to DMA through swiotlb need to be treated as if
they are addressing limited.
Signed-off-by: Christoph Hellwig <h...@lst.de>
---
include/linux/dma-direct.h | 1 +
kernel/dma/direct.c | 8 ++++++--
kernel/dma/mapping.c | 3 +++
3 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index 24b8684aa21d..83aac21434c6 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h
@@ -85,4 +85,5 @@ int dma_direct_mmap(struct device *dev, struct vm_area_struct
*vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs);
int dma_direct_supported(struct device *dev, u64 mask);
+bool dma_direct_addressing_limited(struct device *dev);
#endif /* _LINUX_DMA_DIRECT_H */
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 6af7ae83c4ad..450f3abe5cb5 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -497,11 +497,15 @@ int dma_direct_supported(struct device *dev, u64 mask)
return mask >= __phys_to_dma(dev, min_mask);
}
+bool dma_direct_addressing_limited(struct device *dev)
+{
+ return force_dma_unencrypted(dev) || swiotlb_force == SWIOTLB_FORCE;
+}
+
size_t dma_direct_max_mapping_size(struct device *dev)
{
/* If SWIOTLB is active, use its maximum mapping size */
- if (is_swiotlb_active() &&
- (dma_addressing_limited(dev) || swiotlb_force == SWIOTLB_FORCE))
+ if (is_swiotlb_active() && dma_addressing_limited(dev))
return swiotlb_max_mapping_size(dev);
return SIZE_MAX;
}
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 1dbe6d725962..ebc60633d89a 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -416,6 +416,9 @@ EXPORT_SYMBOL_GPL(dma_get_merge_boundary);
*/
bool dma_addressing_limited(struct device *dev)
{
+ if (dma_is_direct(get_dma_ops(dev)) &&
+ dma_direct_addressing_limited(dev))
+ return true;
return min_not_zero(dma_get_mask(dev), dev->bus_dma_limit) <
dma_get_required_mask(dev);
}
--
2.20.1
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
