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sh: declared coherent memory support V2 fix 

This patch fixes the recently introduced declared coherent memory support.
Without this fix a cached memory area is returned by dma_alloc_coherent() -
unless dma_declare_coherent_memory() has setup a separate area.

This patch makes sure an uncached memory area is returned. With this patch
it is now possible to ping through an rtl8139 interface on r2d-plus.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2008-01-25 12:42:48 +09:00 committed by Paul Mundt
parent e760e716d4
commit 2a3eeba88f
1 changed files with 19 additions and 11 deletions
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30
arch/sh/mm/consistent.c
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@ -26,7 +26,7 @@ struct dma_coherent_mem {
void *dma_alloc_coherent(struct device *dev, size_t size, void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp) dma_addr_t *dma_handle, gfp_t gfp)
{ {
void *ret; void *ret, *ret_nocache;
struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL; struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
int order = get_order(size); int order = get_order(size);
@ -44,17 +44,24 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
} }
ret = (void *)__get_free_pages(gfp, order); ret = (void *)__get_free_pages(gfp, order);
if (!ret)
return NULL;
if (ret != NULL) { memset(ret, 0, size);
memset(ret, 0, size); /*
/* * Pages from the page allocator may have data present in
* Pages from the page allocator may have data present in * cache. So flush the cache before using uncached memory.
* cache. So flush the cache before using uncached memory. */
*/ dma_cache_sync(dev, ret, size, DMA_BIDIRECTIONAL);
dma_cache_sync(NULL, ret, size, DMA_BIDIRECTIONAL);
*dma_handle = virt_to_phys(ret); ret_nocache = ioremap_nocache(virt_to_phys(ret), size);
if (!ret_nocache) {
free_pages((unsigned long)ret, order);
return NULL;
} }
return ret;
*dma_handle = virt_to_phys(ret);
return ret_nocache;
} }
EXPORT_SYMBOL(dma_alloc_coherent); EXPORT_SYMBOL(dma_alloc_coherent);
@ -71,7 +78,8 @@ void dma_free_coherent(struct device *dev, size_t size,
} else { } else {
WARN_ON(irqs_disabled()); /* for portability */ WARN_ON(irqs_disabled()); /* for portability */
BUG_ON(mem && mem->flags & DMA_MEMORY_EXCLUSIVE); BUG_ON(mem && mem->flags & DMA_MEMORY_EXCLUSIVE);
free_pages((unsigned long)vaddr, order); free_pages((unsigned long)phys_to_virt(dma_handle), order);
iounmap(vaddr);
} }
} }
EXPORT_SYMBOL(dma_free_coherent); EXPORT_SYMBOL(dma_free_coherent);