MIPS: Consolidate coherent and non-coherent dma_alloc code

Besides eliminating lots of duplication this also allows allocations with
the DMA_ATTR_NON_CONSISTENT to use the CMA allocator.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17181/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c
index 8e78251..93bab5d 100644 (file)
--- a/arch/mips/mm/dma-default.c
+++ b/arch/mips/mm/dma-default.c
@@ -127,23 +127,6 @@ static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
        return gfp | dma_flag;
 }
 
-static void *mips_dma_alloc_noncoherent(struct device *dev, size_t size,
-       dma_addr_t * dma_handle, gfp_t gfp)
-{
-       void *ret;
-
-       gfp = massage_gfp_flags(dev, gfp);
-
-       ret = (void *) __get_free_pages(gfp, get_order(size));
-
-       if (ret != NULL) {
-               memset(ret, 0, size);
-               *dma_handle = plat_map_dma_mem(dev, ret, size);
-       }
-
-       return ret;
-}
-
 static void *mips_dma_alloc_coherent(struct device *dev, size_t size,
        dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
 {
@@ -151,13 +134,6 @@ static void *mips_dma_alloc_coherent(struct device *dev, size_t size,
        struct page *page = NULL;
        unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
 
-       /*
-        * XXX: seems like the coherent and non-coherent implementations could
-        * be consolidated.
-        */
-       if (attrs & DMA_ATTR_NON_CONSISTENT)
-               return mips_dma_alloc_noncoherent(dev, size, dma_handle, gfp);
-
        gfp = massage_gfp_flags(dev, gfp);
 
        if (IS_ENABLED(CONFIG_DMA_CMA) && gfpflags_allow_blocking(gfp))
@@ -172,7 +148,8 @@ static void *mips_dma_alloc_coherent(struct device *dev, size_t size,
        ret = page_address(page);
        memset(ret, 0, size);
        *dma_handle = plat_map_dma_mem(dev, ret, size);
-       if (!plat_device_is_coherent(dev)) {
+       if (!(attrs & DMA_ATTR_NON_CONSISTENT) &&
+           !plat_device_is_coherent(dev)) {
                dma_cache_wback_inv((unsigned long) ret, size);
                ret = UNCAC_ADDR(ret);
        }
@@ -180,14 +157,6 @@ static void *mips_dma_alloc_coherent(struct device *dev, size_t size,
        return ret;
 }
 
-
-static void mips_dma_free_noncoherent(struct device *dev, size_t size,
-               void *vaddr, dma_addr_t dma_handle)
-{
-       plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
-       free_pages((unsigned long) vaddr, get_order(size));
-}
-
 static void mips_dma_free_coherent(struct device *dev, size_t size, void *vaddr,
        dma_addr_t dma_handle, unsigned long attrs)
 {
@@ -195,14 +164,9 @@ static void mips_dma_free_coherent(struct device *dev, size_t size, void *vaddr,
        unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
        struct page *page = NULL;
 
-       if (attrs & DMA_ATTR_NON_CONSISTENT) {
-               mips_dma_free_noncoherent(dev, size, vaddr, dma_handle);
-               return;
-       }
-
        plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
 
-       if (!plat_device_is_coherent(dev))
+       if (!(attrs & DMA_ATTR_NON_CONSISTENT) && !plat_device_is_coherent(dev))
                addr = CAC_ADDR(addr);
 
        page = virt_to_page((void *) addr);