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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/pgtable-ppc32.h
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/pgtable-ppc32.h')
-rw-r--r--arch/powerpc/include/asm/pgtable-ppc32.h4
1 files changed, 4 insertions, 0 deletions
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