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Subject[PATCH V8 2/5] MIPS: Implement dma_map_ops::get_cache_alignment()
Date
Currently, MIPS is an architecture which support coherent & noncoherent
devices co-exist. So implement get_cache_alignment() function pointer
in 'struct dma_map_ops' to return different dma alignments.

Cc: stable@vger.kernel.org
Signed-off-by: Huacai Chen <chenhc@lemote.com>
---
arch/mips/cavium-octeon/dma-octeon.c | 3 ++-
arch/mips/include/asm/dma-coherence.h | 2 ++
arch/mips/loongson64/common/dma-swiotlb.c | 1 +
arch/mips/mm/dma-default.c | 11 ++++++++++-
arch/mips/netlogic/common/nlm-dma.c | 3 ++-
5 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c
index c64bd87..41c29a85 100644
--- a/arch/mips/cavium-octeon/dma-octeon.c
+++ b/arch/mips/cavium-octeon/dma-octeon.c
@@ -324,7 +324,8 @@ static struct octeon_dma_map_ops _octeon_pci_dma_map_ops = {
.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
.sync_sg_for_device = octeon_dma_sync_sg_for_device,
.mapping_error = swiotlb_dma_mapping_error,
- .dma_supported = swiotlb_dma_supported
+ .dma_supported = swiotlb_dma_supported,
+ .get_cache_alignment = mips_dma_get_cache_alignment
},
};

diff --git a/arch/mips/include/asm/dma-coherence.h b/arch/mips/include/asm/dma-coherence.h
index 72d0eab..5f7a9fc 100644
--- a/arch/mips/include/asm/dma-coherence.h
+++ b/arch/mips/include/asm/dma-coherence.h
@@ -29,4 +29,6 @@ extern int hw_coherentio;
#define hw_coherentio 0
#endif /* CONFIG_DMA_MAYBE_COHERENT */

+int mips_dma_get_cache_alignment(struct device *dev);
+
#endif
diff --git a/arch/mips/loongson64/common/dma-swiotlb.c b/arch/mips/loongson64/common/dma-swiotlb.c
index 34486c1..17b9897 100644
--- a/arch/mips/loongson64/common/dma-swiotlb.c
+++ b/arch/mips/loongson64/common/dma-swiotlb.c
@@ -119,6 +119,7 @@ static const struct dma_map_ops loongson_dma_map_ops = {
.sync_sg_for_device = loongson_dma_sync_sg_for_device,
.mapping_error = swiotlb_dma_mapping_error,
.dma_supported = loongson_dma_supported,
+ .get_cache_alignment = mips_dma_get_cache_alignment
};

void __init plat_swiotlb_setup(void)
diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c
index c01bd20..e8f0659 100644
--- a/arch/mips/mm/dma-default.c
+++ b/arch/mips/mm/dma-default.c
@@ -394,6 +394,14 @@ void dma_cache_sync(struct device *dev, void *vaddr, size_t size,

EXPORT_SYMBOL(dma_cache_sync);

+int mips_dma_get_cache_alignment(struct device *dev)
+{
+ if (plat_device_is_coherent(dev))
+ return 1;
+ else
+ return ARCH_DMA_MINALIGN;
+}
+
static const struct dma_map_ops mips_default_dma_map_ops = {
.alloc = mips_dma_alloc_coherent,
.free = mips_dma_free_coherent,
@@ -407,7 +415,8 @@ static const struct dma_map_ops mips_default_dma_map_ops = {
.sync_sg_for_cpu = mips_dma_sync_sg_for_cpu,
.sync_sg_for_device = mips_dma_sync_sg_for_device,
.mapping_error = mips_dma_mapping_error,
- .dma_supported = mips_dma_supported
+ .dma_supported = mips_dma_supported,
+ .get_cache_alignment = mips_dma_get_cache_alignment
};

const struct dma_map_ops *mips_dma_map_ops = &mips_default_dma_map_ops;
diff --git a/arch/mips/netlogic/common/nlm-dma.c b/arch/mips/netlogic/common/nlm-dma.c
index 0ec9d9d..e9a9ddc 100644
--- a/arch/mips/netlogic/common/nlm-dma.c
+++ b/arch/mips/netlogic/common/nlm-dma.c
@@ -79,7 +79,8 @@ const struct dma_map_ops nlm_swiotlb_dma_ops = {
.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
.sync_sg_for_device = swiotlb_sync_sg_for_device,
.mapping_error = swiotlb_dma_mapping_error,
- .dma_supported = swiotlb_dma_supported
+ .dma_supported = swiotlb_dma_supported,
+ .get_cache_alignment = mips_dma_get_cache_alignment
};

void __init plat_swiotlb_setup(void)
--
2.7.0


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