The ppc32 case of dma_nommu_dma_supported already was a no-op, and the
64-bit case came to the same conclusion as dma_direct_supported, so
replace it with the generic version.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
arch/powerpc/Kconfig | 1 +
arch/powerpc/kernel/dma.c | 28 +++-------------------------
2 files changed, 4 insertions(+), 25 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index f9cae7edd735..bbfa6a8df4da 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -158,6 +158,7 @@ config PPC
select CLONE_BACKWARDS
select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
select DYNAMIC_FTRACE if FUNCTION_TRACER
+ select DMA_DIRECT_OPS
select EDAC_ATOMIC_SCRUB
select EDAC_SUPPORT
select GENERIC_ATOMIC64 if PPC32
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 3487de83bb37..511a4972560d 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -40,28 +40,6 @@ static u64 __maybe_unused get_pfn_limit(struct device *dev)
return pfn;
}
-static int dma_nommu_dma_supported(struct device *dev, u64 mask)
-{
-#ifdef CONFIG_PPC64
- u64 limit = phys_to_dma(dev, (memblock_end_of_DRAM() - 1));
-
- /* Limit fits in the mask, we are good */
- if (mask >= limit)
- return 1;
-
-#ifdef CONFIG_FSL_SOC
- /* Freescale gets another chance via ZONE_DMA/ZONE_DMA32, however
- * that will have to be refined if/when they support iommus
- */
- return 1;
-#endif
- /* Sorry ... */
- return 0;
-#else
- return 1;
-#endif
-}
-
#ifndef CONFIG_NOT_COHERENT_CACHE
void *__dma_nommu_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag,
@@ -126,7 +104,7 @@ static void *dma_nommu_alloc_coherent(struct device *dev, size_t size,
/* The coherent mask may be smaller than the real mask, check if
* we can really use the direct ops
*/
- if (dma_nommu_dma_supported(dev, dev->coherent_dma_mask))
+ if (dma_direct_supported(dev, dev->coherent_dma_mask))
return __dma_nommu_alloc_coherent(dev, size, dma_handle,
flag, attrs);
@@ -148,7 +126,7 @@ static void dma_nommu_free_coherent(struct device *dev, size_t size,
struct iommu_table *iommu;
/* See comments in dma_nommu_alloc_coherent() */
- if (dma_nommu_dma_supported(dev, dev->coherent_dma_mask))
+ if (dma_direct_supported(dev, dev->coherent_dma_mask))
return __dma_nommu_free_coherent(dev, size, vaddr, dma_handle,
attrs);
/* Maybe we used an iommu ... */
@@ -265,7 +243,7 @@ const struct dma_map_ops dma_nommu_ops = {
.mmap = dma_nommu_mmap_coherent,
.map_sg = dma_nommu_map_sg,
.unmap_sg = dma_nommu_unmap_sg,
- .dma_supported = dma_nommu_dma_supported,
+ .dma_supported = dma_direct_supported,
.map_page = dma_nommu_map_page,
.unmap_page = dma_nommu_unmap_page,
.get_required_mask = dma_nommu_get_required_mask,
--
2.18.0
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