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Subject[patch 2.6.13] swiotlb: add swiotlb_sync_single_range_for_{cpu,device}
Add swiotlb_sync_single_range_for_{cpu,device} implementations.  This is
used to support implementation of dma_sync_single_range_for_{cpu,device}
on x86_64.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

arch/ia64/lib/swiotlb.c | 33 +++++++++++++++++++++++++++++++++
include/asm-x86_64/swiotlb.h | 8 ++++++++
2 files changed, 41 insertions(+)

diff --git a/arch/ia64/lib/swiotlb.c b/arch/ia64/lib/swiotlb.c
--- a/arch/ia64/lib/swiotlb.c
+++ b/arch/ia64/lib/swiotlb.c
@@ -522,6 +522,37 @@ swiotlb_sync_single_for_device(struct de
}

/*
+ * Same as above, but for a sub-range of the mapping.
+ */
+void
+swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
+ unsigned long offset, size_t size, int dir)
+{
+ char *dma_addr = phys_to_virt(dev_addr) + offset;
+
+ if (dir == DMA_NONE)
+ BUG();
+ if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
+ sync_single(hwdev, dma_addr, size, dir);
+ else if (dir == DMA_FROM_DEVICE)
+ mark_clean(dma_addr, size);
+}
+
+void
+swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
+ unsigned long offset, size_t size, int dir)
+{
+ char *dma_addr = phys_to_virt(dev_addr) + offset;
+
+ if (dir == DMA_NONE)
+ BUG();
+ if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
+ sync_single(hwdev, dma_addr, size, dir);
+ else if (dir == DMA_FROM_DEVICE)
+ mark_clean(dma_addr, size);
+}
+
+/*
* Map a set of buffers described by scatterlist in streaming mode for DMA.
* This is the scatter-gather version of the above swiotlb_map_single
* interface. Here the scatter gather list elements are each tagged with the
@@ -650,6 +681,8 @@ EXPORT_SYMBOL(swiotlb_map_sg);
EXPORT_SYMBOL(swiotlb_unmap_sg);
EXPORT_SYMBOL(swiotlb_sync_single_for_cpu);
EXPORT_SYMBOL(swiotlb_sync_single_for_device);
+EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu);
+EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device);
EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu);
EXPORT_SYMBOL(swiotlb_sync_sg_for_device);
EXPORT_SYMBOL(swiotlb_dma_mapping_error);
diff --git a/include/asm-x86_64/swiotlb.h b/include/asm-x86_64/swiotlb.h
--- a/include/asm-x86_64/swiotlb.h
+++ b/include/asm-x86_64/swiotlb.h
@@ -15,6 +15,14 @@ extern void swiotlb_sync_single_for_cpu(
extern void swiotlb_sync_single_for_device(struct device *hwdev,
dma_addr_t dev_addr,
size_t size, int dir);
+extern void swiotlb_sync_single_range_for_cpu(struct device *hwdev,
+ dma_addr_t dev_addr,
+ unsigned long offset,
+ size_t size, int dir);
+extern void swiotlb_sync_single_range_for_device(struct device *hwdev,
+ dma_addr_t dev_addr,
+ unsigned long offset,
+ size_t size, int dir);
extern void swiotlb_sync_sg_for_cpu(struct device *hwdev,
struct scatterlist *sg, int nelems,
int dir);
--
John W. Linville
linville@tuxdriver.com
-
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