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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-05-27 13:50:33 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-05-27 16:33:59 +1000
commit8b31e49d1d75729c1da9009664ba52abd1adc628 (patch)
tree046095a0cce051a471c7af93784c024c29a4f99b /arch/powerpc/include/asm
parentf637a49e507c88354ab32b5d914e06acfb7ee00d (diff)
powerpc: Fix up dma_alloc_coherent() on platforms without cache coherency.
The implementation we just revived has issues, such as using a Kconfig-defined virtual address area in kernel space that nothing actually carves out (and thus will overlap whatever is there), or having some dependencies on being self contained in a single PTE page which adds unnecessary constraints on the kernel virtual address space. This fixes it by using more classic PTE accessors and automatically locating the area for consistent memory, carving an appropriate hole in the kernel virtual address space, leaving only the size of that area as a Kconfig option. It also brings some dma-mask related fixes from the ARM implementation which was almost identical initially but grew its own fixes. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm')
-rw-r--r--arch/powerpc/include/asm/dma-mapping.h6
-rw-r--r--arch/powerpc/include/asm/pgtable-ppc32.h4
2 files changed, 8 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index c69f2b5f0cc..cb448d68452 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -26,7 +26,9 @@
* allocate the space "normally" and use the cache management functions
* to ensure it is consistent.
*/
-extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp);
+struct device;
+extern void *__dma_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *handle, gfp_t gfp);
extern void __dma_free_coherent(size_t size, void *vaddr);
extern void __dma_sync(void *vaddr, size_t size, int direction);
extern void __dma_sync_page(struct page *page, unsigned long offset,
@@ -37,7 +39,7 @@ extern void __dma_sync_page(struct page *page, unsigned long offset,
* Cache coherent cores.
*/
-#define __dma_alloc_coherent(gfp, size, handle) NULL
+#define __dma_alloc_coherent(dev, gfp, size, handle) NULL
#define __dma_free_coherent(size, addr) ((void)0)
#define __dma_sync(addr, size, rw) ((void)0)
#define __dma_sync_page(pg, off, sz, rw) ((void)0)
diff --git a/arch/powerpc/include/asm/pgtable-ppc32.h b/arch/powerpc/include/asm/pgtable-ppc32.h
index 28fe9d4bae3..c9ff9d75990 100644
--- a/arch/powerpc/include/asm/pgtable-ppc32.h
+++ b/arch/powerpc/include/asm/pgtable-ppc32.h
@@ -71,7 +71,11 @@ extern int icache_44x_need_flush;
* until mem_init() at which point this becomes the top of the vmalloc
* and ioremap space
*/
+#ifdef CONFIG_NOT_COHERENT_CACHE
+#define IOREMAP_TOP ((KVIRT_TOP - CONFIG_CONSISTENT_SIZE) & PAGE_MASK)
+#else
#define IOREMAP_TOP KVIRT_TOP
+#endif
/*
* Just any arbitrary offset to the start of the vmalloc VM area: the