On 2022-03-17 16:25, Michael Kelley via iommu wrote:
Add a wrapper function to set dma_coherent, avoiding the need for
complex #ifdef's when setting it in architecture independent code.
No. It might happen to work out on the architectures you're looking at,
but if Hyper-V were ever to support, say, AArch32 VMs you might see the
problem. arch_setup_dma_ops() is the tool for this job.
Robin.
Signed-off-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
---
include/linux/dma-map-ops.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h
index 0d5b06b..3350e7a 100644
--- a/include/linux/dma-map-ops.h
+++ b/include/linux/dma-map-ops.h
@@ -254,11 +254,20 @@ static inline bool dev_is_dma_coherent(struct device *dev)
{
return dev->dma_coherent;
}
+static inline void dev_set_dma_coherent(struct device *dev,
+ bool coherent)
+{
+ dev->dma_coherent = coherent;
+}
#else
static inline bool dev_is_dma_coherent(struct device *dev)
{
return true;
}
+static inline void dev_set_dma_coherent(struct device *dev,
+ bool coherent)
+{
+}
#endif /* CONFIG_ARCH_HAS_DMA_COHERENCE_H */
void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
