This is need for powerpc for now. Hopefully we can come up with a clean
generic implementation mid-term.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
include/linux/dma-noncoherent.h | 6 ++++++
kernel/dma/Kconfig | 4 ++++
kernel/dma/noncoherent.c | 1 +
3 files changed, 11 insertions(+)
diff --git a/include/linux/dma-noncoherent.h b/include/linux/dma-noncoherent.h
index 10b2654d549b..61394c6e56df 100644
--- a/include/linux/dma-noncoherent.h
+++ b/include/linux/dma-noncoherent.h
@@ -17,6 +17,12 @@ int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma,
#define arch_dma_mmap NULL
#endif /* CONFIG_DMA_NONCOHERENT_MMAP */
+#ifdef CONFIG_DMA_NONCOHERENT_GET_REQUIRED
+u64 arch_get_required_mask(struct device *dev);
+#else
+#define arch_get_required_mask NULL
+#endif
+
#ifdef CONFIG_DMA_NONCOHERENT_CACHE_SYNC
void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction);
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 9bd54304446f..b523104d6199 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -36,6 +36,10 @@ config DMA_NONCOHERENT_MMAP
bool
depends on DMA_NONCOHERENT_OPS
+config DMA_NONCOHERENT_GET_REQUIRED
+ bool
+ depends on DMA_NONCOHERENT_OPS
+
config DMA_NONCOHERENT_CACHE_SYNC
bool
depends on DMA_NONCOHERENT_OPS
diff --git a/kernel/dma/noncoherent.c b/kernel/dma/noncoherent.c
index 79e9a757387f..cf4ffbe4a09d 100644
--- a/kernel/dma/noncoherent.c
+++ b/kernel/dma/noncoherent.c
@@ -98,5 +98,6 @@ const struct dma_map_ops dma_noncoherent_ops = {
.dma_supported = dma_direct_supported,
.mapping_error = dma_direct_mapping_error,
.cache_sync = arch_dma_cache_sync,
+ .get_required_mask = arch_get_required_mask,
};
EXPORT_SYMBOL(dma_noncoherent_ops);
--
2.18.0
--
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