aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/kernel/pci-dma_32.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/kernel/pci-dma_32.c')
-rw-r--r--arch/x86/kernel/pci-dma_32.c51
1 files changed, 35 insertions, 16 deletions
diff --git a/arch/x86/kernel/pci-dma_32.c b/arch/x86/kernel/pci-dma_32.c
index 818d95efc3c..78c7640252a 100644
--- a/arch/x86/kernel/pci-dma_32.c
+++ b/arch/x86/kernel/pci-dma_32.c
@@ -18,27 +18,50 @@
dma_addr_t bad_dma_address __read_mostly = 0x0;
EXPORT_SYMBOL(bad_dma_address);
-void *dma_alloc_coherent(struct device *dev, size_t size,
- dma_addr_t *dma_handle, gfp_t gfp)
+static int dma_alloc_from_coherent_mem(struct device *dev, ssize_t size,
+ dma_addr_t *dma_handle, void **ret)
{
- void *ret;
struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
int order = get_order(size);
- /* ignore region specifiers */
- gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
if (mem) {
int page = bitmap_find_free_region(mem->bitmap, mem->size,
order);
if (page >= 0) {
*dma_handle = mem->device_base + (page << PAGE_SHIFT);
- ret = mem->virt_base + (page << PAGE_SHIFT);
- memset(ret, 0, size);
- return ret;
+ *ret = mem->virt_base + (page << PAGE_SHIFT);
+ memset(*ret, 0, size);
}
if (mem->flags & DMA_MEMORY_EXCLUSIVE)
- return NULL;
+ *ret = NULL;
+ }
+ return (mem != NULL);
+}
+
+static int dma_release_coherent(struct device *dev, int order, void *vaddr)
+{
+ struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
+
+ if (mem && vaddr >= mem->virt_base && vaddr <
+ (mem->virt_base + (mem->size << PAGE_SHIFT))) {
+ int page = (vaddr - mem->virt_base) >> PAGE_SHIFT;
+
+ bitmap_release_region(mem->bitmap, page, order);
+ return 1;
}
+ return 0;
+}
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp)
+{
+ void *ret = NULL;
+ int order = get_order(size);
+ /* ignore region specifiers */
+ gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
+
+ if (dma_alloc_from_coherent_mem(dev, size, dma_handle, &ret))
+ return ret;
if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
gfp |= GFP_DMA;
@@ -56,15 +79,11 @@ EXPORT_SYMBOL(dma_alloc_coherent);
void dma_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle)
{
- struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
int order = get_order(size);
WARN_ON(irqs_disabled()); /* for portability */
- if (mem && vaddr >= mem->virt_base && vaddr < (mem->virt_base + (mem->size << PAGE_SHIFT))) {
- int page = (vaddr - mem->virt_base) >> PAGE_SHIFT;
-
- bitmap_release_region(mem->bitmap, page, order);
- } else
- free_pages((unsigned long)vaddr, order);
+ if (dma_release_coherent(dev, order, vaddr))
+ return;
+ free_pages((unsigned long)vaddr, order);
}
EXPORT_SYMBOL(dma_free_coherent);