dma-mapping: unify dma_get_cache_alignment implementations

dma_get_cache_alignment returns the minimum DMA alignment.  Architectures
defines it as ARCH_DMA_MINALIGN (formally ARCH_KMALLOC_MINALIGN).  So we
can unify dma_get_cache_alignment implementations.

Note that some architectures implement dma_get_cache_alignment wrongly.
dma_get_cache_alignment() should return the minimum DMA alignment.  So
fully-coherent architectures should return 1.  This patch also fixes this
issue.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/alpha/include/asm/dma-mapping.h b/arch/alpha/include/asm/dma-mapping.h
index 1bce816..b3423d9 100644 (file)
--- a/arch/alpha/include/asm/dma-mapping.h
+++ b/arch/alpha/include/asm/dma-mapping.h
@@ -44,6 +44,5 @@ static inline int dma_set_mask(struct device *dev, u64 mask)
 #define dma_is_consistent(d, h)                        (1)
 
 #define dma_cache_sync(dev, va, size, dir)               ((void)0)
-#define dma_get_cache_alignment()                        L1_CACHE_BYTES
 
 #endif /* _ALPHA_DMA_MAPPING_H */

diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index 69ce072..f4a996d 100644 (file)
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -144,11 +144,6 @@ static inline int dma_set_mask(struct device *dev, u64 dma_mask)
        return 0;
 }
 
-static inline int dma_get_cache_alignment(void)
-{
-       return 32;
-}
-
 static inline int dma_is_consistent(struct device *dev, dma_addr_t handle)
 {
        return !!arch_is_coherent();

diff --git a/arch/avr32/include/asm/dma-mapping.h b/arch/avr32/include/asm/dma-mapping.h
index 0399359..af6b816 100644 (file)
--- a/arch/avr32/include/asm/dma-mapping.h
+++ b/arch/avr32/include/asm/dma-mapping.h
@@ -341,9 +341,4 @@ static inline int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
        return 1;
 }
 
-static inline int dma_get_cache_alignment(void)
-{
-       return boot_cpu_data.dcache.linesz;
-}
-
 #endif /* __ASM_AVR32_DMA_MAPPING_H */

diff --git a/arch/blackfin/include/asm/dma-mapping.h b/arch/blackfin/include/asm/dma-mapping.h
index 212cb80..6694a0f 100644 (file)
--- a/arch/blackfin/include/asm/dma-mapping.h
+++ b/arch/blackfin/include/asm/dma-mapping.h
@@ -21,7 +21,6 @@ void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 #define dma_supported(d, m)         (1)
-#define dma_get_cache_alignment()   (32)
 #define dma_is_consistent(d, h)     (1)
 
 static inline int

diff --git a/arch/cris/include/asm/dma-mapping.h b/arch/cris/include/asm/dma-mapping.h
index da8ef8e..fc30fd0 100644 (file)
--- a/arch/cris/include/asm/dma-mapping.h
+++ b/arch/cris/include/asm/dma-mapping.h
@@ -152,12 +152,6 @@ dma_set_mask(struct device *dev, u64 mask)
        return 0;
 }
 
-static inline int
-dma_get_cache_alignment(void)
-{
-       return (1 << INTERNODE_CACHE_SHIFT);
-}
-
 #define dma_is_consistent(d, h)        (1)
 
 static inline void

diff --git a/arch/frv/include/asm/dma-mapping.h b/arch/frv/include/asm/dma-mapping.h
index 6af5d83..7b05ce1 100644 (file)
--- a/arch/frv/include/asm/dma-mapping.h
+++ b/arch/frv/include/asm/dma-mapping.h
@@ -125,12 +125,6 @@ int dma_set_mask(struct device *dev, u64 mask)
        return 0;
 }
 
-static inline
-int dma_get_cache_alignment(void)
-{
-       return 1 << L1_CACHE_SHIFT;
-}
-
 #define dma_is_consistent(d, h)        (1)
 
 static inline

diff --git a/arch/ia64/include/asm/dma-mapping.h b/arch/ia64/include/asm/dma-mapping.h
index 7d09a09..8d52dee 100644 (file)
--- a/arch/ia64/include/asm/dma-mapping.h
+++ b/arch/ia64/include/asm/dma-mapping.h
@@ -86,8 +86,6 @@ static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
        return daddr;
 }
 
-extern int dma_get_cache_alignment(void);
-
 static inline void
 dma_cache_sync (struct device *dev, void *vaddr, size_t size,
        enum dma_data_direction dir)

diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 41ae6a5..8fb958a 100644 (file)
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -98,12 +98,6 @@ static struct resource bss_resource = {
 
 unsigned long ia64_max_cacheline_size;
 
-int dma_get_cache_alignment(void)
-{
-        return ia64_max_cacheline_size;
-}
-EXPORT_SYMBOL(dma_get_cache_alignment);
-
 unsigned long ia64_iobase;     /* virtual address for I/O accesses */
 EXPORT_SYMBOL(ia64_iobase);
 struct io_space io_space[MAX_IO_SPACES];

diff --git a/arch/m68k/include/asm/dma-mapping.h b/arch/m68k/include/asm/dma-mapping.h
index 26f5054..a1ae732 100644 (file)
--- a/arch/m68k/include/asm/dma-mapping.h
+++ b/arch/m68k/include/asm/dma-mapping.h
@@ -16,11 +16,6 @@ static inline int dma_set_mask(struct device *dev, u64 mask)
        return 0;
 }
 
-static inline int dma_get_cache_alignment(void)
-{
-       return 1 << L1_CACHE_SHIFT;
-}
-
 static inline int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
 {
        return 0;

diff --git a/arch/microblaze/include/asm/dma-mapping.h b/arch/microblaze/include/asm/dma-mapping.h
index 5073895..21df7cb 100644 (file)
--- a/arch/microblaze/include/asm/dma-mapping.h
+++ b/arch/microblaze/include/asm/dma-mapping.h
@@ -132,11 +132,6 @@ static inline void dma_free_coherent(struct device *dev, size_t size,
        ops->free_coherent(dev, size, cpu_addr, dma_handle);
 }
 
-static inline int dma_get_cache_alignment(void)
-{
-       return L1_CACHE_BYTES;
-}
-
 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
                enum dma_data_direction direction)
 {

diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
index 664ba53..d724a15 100644 (file)
--- a/arch/mips/include/asm/dma-mapping.h
+++ b/arch/mips/include/asm/dma-mapping.h
@@ -62,13 +62,6 @@ dma_set_mask(struct device *dev, u64 mask)
        return 0;
 }
 
-static inline int
-dma_get_cache_alignment(void)
-{
-       /* XXX Largest on any MIPS */
-       return 128;
-}
-
 extern int dma_is_consistent(struct device *dev, dma_addr_t dma_addr);
 
 extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,

diff --git a/arch/mn10300/include/asm/dma-mapping.h b/arch/mn10300/include/asm/dma-mapping.h
index 4ed1522..8d452a6 100644 (file)
--- a/arch/mn10300/include/asm/dma-mapping.h
+++ b/arch/mn10300/include/asm/dma-mapping.h
@@ -161,12 +161,6 @@ int dma_set_mask(struct device *dev, u64 mask)
        return 0;
 }
 
-static inline
-int dma_get_cache_alignment(void)
-{
-       return 1 << L1_CACHE_SHIFT;
-}
-
 #define dma_is_consistent(d)   (1)
 
 static inline

diff --git a/arch/parisc/include/asm/dma-mapping.h b/arch/parisc/include/asm/dma-mapping.h
index da69433..44d3f62 100644 (file)
--- a/arch/parisc/include/asm/dma-mapping.h
+++ b/arch/parisc/include/asm/dma-mapping.h
@@ -185,12 +185,6 @@ dma_set_mask(struct device *dev, u64 mask)
 }
 
 static inline int
-dma_get_cache_alignment(void)
-{
-       return dcache_stride;
-}
-
-static inline int
 dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
 {
        return (hppa_dma_ops->dma_sync_single_for_cpu == NULL);

diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index c85ef23..a77ba28 100644 (file)
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -215,21 +215,6 @@ static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
 #define dma_is_consistent(d, h)        (1)
 #endif
 
-static inline int dma_get_cache_alignment(void)
-{
-#ifdef CONFIG_PPC64
-       /* no easy way to get cache size on all processors, so return
-        * the maximum possible, to be safe */
-       return (1 << INTERNODE_CACHE_SHIFT);
-#else
-       /*
-        * Each processor family will define its own L1_CACHE_SHIFT,
-        * L1_CACHE_BYTES wraps to this, so this is always safe.
-        */
-       return L1_CACHE_BYTES;
-#endif
-}
-
 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
                enum dma_data_direction direction)
 {

diff --git a/arch/sh/include/asm/dma-mapping.h b/arch/sh/include/asm/dma-mapping.h
index bea3337..6bb5cc9 100644 (file)
--- a/arch/sh/include/asm/dma-mapping.h
+++ b/arch/sh/include/asm/dma-mapping.h
@@ -48,15 +48,6 @@ void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 #define dma_is_consistent(d, h) (0)
 #endif
 
-static inline int dma_get_cache_alignment(void)
-{
-       /*
-        * Each processor family will define its own L1_CACHE_SHIFT,
-        * L1_CACHE_BYTES wraps to this, so this is always safe.
-        */
-       return L1_CACHE_BYTES;
-}
-
 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
        struct dma_map_ops *ops = get_dma_ops(dev);

diff --git a/arch/sparc/include/asm/dma-mapping.h b/arch/sparc/include/asm/dma-mapping.h
index 4b4a0c0..74db853 100644 (file)
--- a/arch/sparc/include/asm/dma-mapping.h
+++ b/arch/sparc/include/asm/dma-mapping.h
@@ -52,15 +52,6 @@ static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
        return (dma_addr == DMA_ERROR_CODE);
 }
 
-static inline int dma_get_cache_alignment(void)
-{
-       /*
-        * no easy way to get cache size on all processors, so return
-        * the maximum possible, to be safe
-        */
-       return (1 << INTERNODE_CACHE_SHIFT);
-}
-
 static inline int dma_set_mask(struct device *dev, u64 mask)
 {
 #ifdef CONFIG_PCI

diff --git a/arch/tile/include/asm/dma-mapping.h b/arch/tile/include/asm/dma-mapping.h
index cf466b3..1326b91 100644 (file)
--- a/arch/tile/include/asm/dma-mapping.h
+++ b/arch/tile/include/asm/dma-mapping.h
@@ -90,13 +90,6 @@ dma_set_mask(struct device *dev, u64 mask)
        return 0;
 }
 
-static inline int
-dma_get_cache_alignment(void)
-{
-       return L2_CACHE_BYTES;
-}
-
 #define dma_is_consistent(d, h)        (1)
 
-
 #endif /* _ASM_TILE_DMA_MAPPING_H */

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index ac91eed..f9c67e8 100644 (file)
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -87,13 +87,6 @@ dma_cache_sync(struct device *dev, void *vaddr, size_t size,
        flush_write_buffers();
 }
 
-static inline int dma_get_cache_alignment(void)
-{
-       /* no easy way to get cache size on all x86, so return the
-        * maximum possible, to be safe */
-       return boot_cpu_data.x86_clflush_size;
-}
-
 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
                                                    gfp_t gfp)
 {

diff --git a/arch/xtensa/include/asm/dma-mapping.h b/arch/xtensa/include/asm/dma-mapping.h
index 51882ae..7104f2f 100644 (file)
--- a/arch/xtensa/include/asm/dma-mapping.h
+++ b/arch/xtensa/include/asm/dma-mapping.h
@@ -161,12 +161,6 @@ dma_set_mask(struct device *dev, u64 mask)
        return 0;
 }
 
-static inline int
-dma_get_cache_alignment(void)
-{
-       return L1_CACHE_BYTES;
-}
-
 #define dma_is_consistent(d, h)        (1)
 
 static inline void

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 89b7e1a..e0670a5 100644 (file)
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -142,6 +142,14 @@ static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
                return -EIO;
 }
 
+static inline int dma_get_cache_alignment(void)
+{
+#ifdef ARCH_DMA_MINALIGN
+       return ARCH_DMA_MINALIGN;
+#endif
+       return 1;
+}
+
 /* flags for the coherent memory api */
 #define        DMA_MEMORY_MAP                  0x01
 #define DMA_MEMORY_IO                  0x02