[PATCH 1/3] x86: export pci-nommu's alloc_coherent

FUJITA Tomonori
2008-09-24T11:52:39Z

This patch exports nommu_alloc_coherent (renamed
dma_generic_alloc_coherent). GART needs this function.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
arch/x86/kernel/pci-dma.c | 31 +++++++++++++++++++++++++++++++
arch/x86/kernel/pci-nommu.c | 39 +--------------------------------------
include/asm-x86/dma-mapping.h | 3 +++
3 files changed, 35 insertions(+), 38 deletions(-)

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 23882c4..0a3824e 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -134,6 +134,37 @@ unsigned long iommu_num_pages(unsigned long addr, unsigned long len)
EXPORT_SYMBOL(iommu_num_pages);
#endif

+void *dma_generic_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_addr, gfp_t flag)
+{
+ unsigned long dma_mask;
+ struct page *page;
+ dma_addr_t addr;
+
+ dma_mask = dma_alloc_coherent_mask(dev, flag);
+
+ flag |= __GFP_ZERO;
+again:
+ page = alloc_pages_node(dev_to_node(dev), flag, get_order(size));
+ if (!page)
+ return NULL;
+
+ addr = page_to_phys(page);
+ if (!is_buffer_dma_capable(dma_mask, addr, size)) {
+ __free_pages(page, get_order(size));
+
+ if (dma_mask < DMA_32BIT_MASK && !(flag & GFP_DMA)) {
+ flag = (flag & ~GFP_DMA32) | GFP_DMA;
+ goto again;
+ }
+
+ return NULL;
+ }
+
+ *dma_addr = addr;
+ return page_address(page);
+}
+
/*
* See <Documentation/x86_64/boot-options.txt> for the iommu kernel parameter
* documentation.
diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index 1c1c98a..c70ab5a 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -72,43 +72,6 @@ static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
return nents;
}

-static void *
-nommu_alloc_coherent(struct device *hwdev, size_t size,
- dma_addr_t *dma_addr, gfp_t gfp)
-{
- unsigned long dma_mask;
- int node;
- struct page *page;
- dma_addr_t addr;
-
- dma_mask = dma_alloc_coherent_mask(hwdev, gfp);
-
- gfp |= __GFP_ZERO;
-
- node = dev_to_node(hwdev);
-again:
- page = alloc_pages_node(node, gfp, get_order(size));
- if (!page)
- return NULL;
-
- addr = page_to_phys(page);
- if (!is_buffer_dma_capable(dma_mask, addr, size) && !(gfp & GFP_DMA)) {
- free_pages((unsigned long)page_address(page), get_order(size));
- gfp |= GFP_DMA;
- goto again;
- }
-
- if (check_addr("alloc_coherent", hwdev, addr, size)) {
- *dma_addr = addr;
- flush_write_buffers();
- return page_address(page);
- }
-
- free_pages((unsigned long)page_address(page), get_order(size));
-
- return NULL;
-}
-
static void nommu_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_addr)
{
@@ -116,7 +79,7 @@ static void nommu_free_coherent(struct device *dev, size_t size, void *vaddr,
}

struct dma_mapping_ops nommu_dma_ops = {
- .alloc_coherent = nommu_alloc_coherent,
+ .alloc_coherent = dma_generic_alloc_coherent,
.free_coherent = nommu_free_coherent,
.map_single = nommu_map_single,
.map_sg = nommu_map_sg,
diff --git a/include/asm-x86/dma-mapping.h b/include/asm-x86/dma-mapping.h
index 7b0fdd6..7b9f308 100644
--- a/include/asm-x86/dma-mapping.h
+++ b/include/asm-x86/dma-mapping.h
@@ -90,6 +90,9 @@ static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
extern int dma_supported(struct device *hwdev, u64 mask);
extern int dma_set_mask(struct device *dev, u64 mask);

+extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_addr, gfp_t flag);
+
static inline dma_addr_t
dma_map_single(struct device *hwdev, void *ptr, size_t size,
int direction)
--
1.5.4.2