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Subject[PATCH 02/20] x86: implement dma_map_single through dma_ops
Date
That's already the name of the game for x86_64. For i386,
we add a pci-base_32.c, that will hold the default operations.
The function call itself goes through dma-mapping.h , the common
header

Signed-off-by: Glauber Costa <gcosta@redhat.com>
---
arch/x86/kernel/Makefile | 1 +
arch/x86/kernel/pci-base_32.c | 20 ++++++++++++++++++++
include/asm-x86/dma-mapping.h | 10 ++++++++++
include/asm-x86/dma-mapping_32.h | 10 ----------
include/asm-x86/dma-mapping_64.h | 9 ---------
5 files changed, 31 insertions(+), 19 deletions(-)
create mode 100644 arch/x86/kernel/pci-base_32.c

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 340221f..95fbf57 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -27,6 +27,7 @@ obj-y += pci-dma_$(BITS).o bootflag.o e820_$(BITS).o
obj-y += quirks.o i8237.o topology.o kdebugfs.o
obj-y += alternative.o i8253.o
obj-$(CONFIG_X86_64) += pci-nommu_64.o bugs_64.o
+obj-$(CONFIG_X86_32) += pci-base_32.o
obj-y += tsc_$(BITS).o io_delay.o rtc.o

obj-y += process.o
diff --git a/arch/x86/kernel/pci-base_32.c b/arch/x86/kernel/pci-base_32.c
new file mode 100644
index 0000000..b613d73
--- /dev/null
+++ b/arch/x86/kernel/pci-base_32.c
@@ -0,0 +1,20 @@
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <asm/dma-mapping.h>
+
+static dma_addr_t pci32_map_single(struct device *dev, void *ptr,
+ size_t size, int direction)
+{
+ WARN_ON(size == 0);
+ flush_write_buffers();
+ return virt_to_phys(ptr);
+}
+
+static const struct dma_mapping_ops pci32_dma_ops = {
+ .map_single = pci32_map_single,
+};
+
+const struct dma_mapping_ops *dma_ops = &pci32_dma_ops;
+EXPORT_SYMBOL(dma_ops);
diff --git a/include/asm-x86/dma-mapping.h b/include/asm-x86/dma-mapping.h
index aebd178..d320244 100644
--- a/include/asm-x86/dma-mapping.h
+++ b/include/asm-x86/dma-mapping.h
@@ -50,10 +50,20 @@ struct dma_mapping_ops {
int is_phys;
};

+extern const struct dma_mapping_ops *dma_ops;
+
#ifdef CONFIG_X86_32
# include "dma-mapping_32.h"
#else
# include "dma-mapping_64.h"
#endif

+static inline dma_addr_t
+dma_map_single(struct device *hwdev, void *ptr, size_t size,
+ int direction)
+{
+ BUG_ON(!valid_dma_direction(direction));
+ return dma_ops->map_single(hwdev, ptr, size, direction);
+}
+
#endif
diff --git a/include/asm-x86/dma-mapping_32.h b/include/asm-x86/dma-mapping_32.h
index 55f01bd..b496306 100644
--- a/include/asm-x86/dma-mapping_32.h
+++ b/include/asm-x86/dma-mapping_32.h
@@ -17,16 +17,6 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
void dma_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle);

-static inline dma_addr_t
-dma_map_single(struct device *dev, void *ptr, size_t size,
- enum dma_data_direction direction)
-{
- BUG_ON(!valid_dma_direction(direction));
- WARN_ON(size == 0);
- flush_write_buffers();
- return virt_to_phys(ptr);
-}
-
static inline void
dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction direction)
diff --git a/include/asm-x86/dma-mapping_64.h b/include/asm-x86/dma-mapping_64.h
index 369188a..969a7da 100644
--- a/include/asm-x86/dma-mapping_64.h
+++ b/include/asm-x86/dma-mapping_64.h
@@ -2,7 +2,6 @@
#define _X8664_DMA_MAPPING_H 1

extern dma_addr_t bad_dma_address;
-extern const struct dma_mapping_ops* dma_ops;
extern int iommu_merge;

static inline int dma_mapping_error(dma_addr_t dma_addr)
@@ -24,14 +23,6 @@ extern void *dma_alloc_coherent(struct device *dev, size_t size,
extern void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle);

-static inline dma_addr_t
-dma_map_single(struct device *hwdev, void *ptr, size_t size,
- int direction)
-{
- BUG_ON(!valid_dma_direction(direction));
- return dma_ops->map_single(hwdev, ptr, size, direction);
-}
-
static inline void
dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
int direction)
--
1.5.0.6


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