aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--arch/arm/mm/dma-mapping.c141
1 files changed, 68 insertions, 73 deletions
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 62b4240b34b..6b24e5ed85c 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -207,7 +207,70 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
*handle = ~0;
return NULL;
}
+
+static void __dma_free_remap(void *cpu_addr, size_t size)
+{
+ struct arm_vmregion *c;
+ unsigned long addr;
+ pte_t *ptep;
+ int idx;
+ u32 off;
+
+ c = arm_vmregion_find_remove(&consistent_head, (unsigned long)cpu_addr);
+ if (!c) {
+ printk(KERN_ERR "%s: trying to free invalid coherent area: %p\n",
+ __func__, cpu_addr);
+ dump_stack();
+ return;
+ }
+
+ if ((c->vm_end - c->vm_start) != size) {
+ printk(KERN_ERR "%s: freeing wrong coherent size (%ld != %d)\n",
+ __func__, c->vm_end - c->vm_start, size);
+ dump_stack();
+ size = c->vm_end - c->vm_start;
+ }
+
+ idx = CONSISTENT_PTE_INDEX(c->vm_start);
+ off = CONSISTENT_OFFSET(c->vm_start) & (PTRS_PER_PTE-1);
+ ptep = consistent_pte[idx] + off;
+ addr = c->vm_start;
+ do {
+ pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep);
+ unsigned long pfn;
+
+ ptep++;
+ addr += PAGE_SIZE;
+ off++;
+ if (off >= PTRS_PER_PTE) {
+ off = 0;
+ ptep = consistent_pte[++idx];
+ }
+
+ if (!pte_none(pte) && pte_present(pte)) {
+ pfn = pte_pfn(pte);
+
+ if (pfn_valid(pfn)) {
+ struct page *page = pfn_to_page(pfn);
+
+ /*
+ * x86 does not mark the pages reserved...
+ */
+ ClearPageReserved(page);
+ continue;
+ }
+ }
+ printk(KERN_CRIT "%s: bad page in kernel page table\n",
+ __func__);
+ } while (size -= PAGE_SIZE);
+
+ flush_tlb_kernel_range(c->vm_start, c->vm_end);
+
+ arm_vmregion_free(&consistent_head, c);
+}
+
#else /* !CONFIG_MMU */
+
static void *
__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
pgprot_t prot)
@@ -224,6 +287,9 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
*handle = page_to_dma(dev, page);
return page_address(page);
}
+
+#define __dma_free_remap(addr, size) do { } while (0)
+
#endif /* CONFIG_MMU */
/*
@@ -317,15 +383,8 @@ EXPORT_SYMBOL(dma_mmap_writecombine);
* free a page as defined by the above mapping.
* Must not be called with IRQs disabled.
*/
-#ifdef CONFIG_MMU
void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle)
{
- struct arm_vmregion *c;
- unsigned long addr;
- pte_t *ptep;
- int idx;
- u32 off;
-
WARN_ON(irqs_disabled());
if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
@@ -333,75 +392,11 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr
size = PAGE_ALIGN(size);
- if (arch_is_coherent()) {
- __dma_free_buffer(dma_to_page(dev, handle), size);
- return;
- }
-
- c = arm_vmregion_find_remove(&consistent_head, (unsigned long)cpu_addr);
- if (!c)
- goto no_area;
-
- if ((c->vm_end - c->vm_start) != size) {
- printk(KERN_ERR "%s: freeing wrong coherent size (%ld != %d)\n",
- __func__, c->vm_end - c->vm_start, size);
- dump_stack();
- size = c->vm_end - c->vm_start;
- }
-
- idx = CONSISTENT_PTE_INDEX(c->vm_start);
- off = CONSISTENT_OFFSET(c->vm_start) & (PTRS_PER_PTE-1);
- ptep = consistent_pte[idx] + off;
- addr = c->vm_start;
- do {
- pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep);
- unsigned long pfn;
-
- ptep++;
- addr += PAGE_SIZE;
- off++;
- if (off >= PTRS_PER_PTE) {
- off = 0;
- ptep = consistent_pte[++idx];
- }
-
- if (!pte_none(pte) && pte_present(pte)) {
- pfn = pte_pfn(pte);
-
- if (pfn_valid(pfn)) {
- struct page *page = pfn_to_page(pfn);
-
- /*
- * x86 does not mark the pages reserved...
- */
- ClearPageReserved(page);
- continue;
- }
- }
- printk(KERN_CRIT "%s: bad page in kernel page table\n",
- __func__);
- } while (size -= PAGE_SIZE);
-
- flush_tlb_kernel_range(c->vm_start, c->vm_end);
-
- arm_vmregion_free(&consistent_head, c);
+ if (!arch_is_coherent())
+ __dma_free_remap(cpu_addr, size);
__dma_free_buffer(dma_to_page(dev, handle), size);
- return;
-
- no_area:
- printk(KERN_ERR "%s: trying to free invalid coherent area: %p\n",
- __func__, cpu_addr);
- dump_stack();
}
-#else /* !CONFIG_MMU */
-void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle)
-{
- if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
- return;
- __dma_free_buffer(dma_to_page(dev, handle), PAGE_ALIGN(size));
-}
-#endif /* CONFIG_MMU */
EXPORT_SYMBOL(dma_free_coherent);
/*