fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / arch / arm / mm / consistent.c

diff --git a/arch/arm/mm/consistent.c b/arch/arm/mm/consistent.c
index c2ee18d..6a9c362 100644 (file)
--- a/arch/arm/mm/consistent.c
+++ b/arch/arm/mm/consistent.c
@@ -18,6 +18,7 @@
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 
+#include <asm/memory.h>
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 #include <asm/sizes.h>
@@ -223,6 +224,8 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
                pte = consistent_pte[idx] + off;
                c->vm_pages = page;
 
+               split_page(page, order);
+
                /*
                 * Set the "dma handle"
                 */
@@ -231,12 +234,11 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
                do {
                        BUG_ON(!pte_none(*pte));
 
-                       set_page_count(page, 1);
                        /*
                         * x86 does not mark the pages reserved...
                         */
                        SetPageReserved(page);
-                       set_pte(pte, mk_pte(page, prot));
+                       set_pte_ext(pte, mk_pte(page, prot), 0);
                        page++;
                        pte++;
                        off++;
@@ -250,7 +252,6 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
                 * Free the otherwise unused pages.
                 */
                while (page < end) {
-                       set_page_count(page, 1);
                        __free_page(page);
                        page++;
                }
@@ -272,6 +273,17 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
 void *
 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
 {
+       if (arch_is_coherent()) {
+               void *virt;
+
+               virt = kmalloc(size, gfp);
+               if (!virt)
+                       return NULL;
+               *handle =  virt_to_dma(dev, virt);
+
+               return virt;
+       }
+
        return __dma_alloc(dev, size, handle, gfp,
                           pgprot_noncached(pgprot_kernel));
 }
@@ -350,6 +362,11 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr
 
        WARN_ON(irqs_disabled());
 
+       if (arch_is_coherent()) {
+               kfree(cpu_addr);
+               return;
+       }
+
        size = PAGE_ALIGN(size);
 
        spin_lock_irqsave(&consistent_lock, flags);
@@ -459,6 +476,9 @@ core_initcall(consistent_init);
 
 /*
  * Make an area consistent for devices.
+ * Note: Drivers should NOT use this function directly, as it will break
+ * platforms with CONFIG_DMABOUNCE.
+ * Use the driver DMA support - see dma-mapping.h (dma_sync_*)
  */
 void consistent_sync(void *vaddr, size_t size, int direction)
 {