Page fault would raise a CPU interrupt, it is not
a good idea.
Signed-off-by: Hsia-Jun(Randy) Li <randy.li@xxxxxxxxxxxxx>
---
drivers/dma-buf/heaps/cma_heap.c | 26 +++-----------------------
1 file changed, 3 insertions(+), 23 deletions(-)
diff --git a/drivers/dma-buf/heaps/cma_heap.c
b/drivers/dma-buf/heaps/cma_heap.c
index ee899f8e6721..7d0b15ad21a7 100644
--- a/drivers/dma-buf/heaps/cma_heap.c
+++ b/drivers/dma-buf/heaps/cma_heap.c
@@ -160,35 +160,15 @@ static int cma_heap_dma_buf_end_cpu_access(struct
dma_buf *dmabuf,
return 0;
}
-static vm_fault_t cma_heap_vm_fault(struct vm_fault *vmf)
-{
- struct vm_area_struct *vma = vmf->vma;
- struct cma_heap_buffer *buffer = vma->vm_private_data;
-
- if (vmf->pgoff > buffer->pagecount)
- return VM_FAULT_SIGBUS;
-
- vmf->page = buffer->pages[vmf->pgoff];
- get_page(vmf->page);
-
- return 0;
-}
-
-static const struct vm_operations_struct dma_heap_vm_ops = {
- .fault = cma_heap_vm_fault,
-};
-
static int cma_heap_mmap(struct dma_buf *dmabuf, struct vm_area_struct
*vma)
{
struct cma_heap_buffer *buffer = dmabuf->priv;
-
if ((vma->vm_flags & (VM_SHARED | VM_MAYSHARE)) == 0)
return -EINVAL;
- vma->vm_ops = &dma_heap_vm_ops;
- vma->vm_private_data = buffer;
-
- return 0;
+ return remap_pfn_range(vma, vma->vm_start,
+ page_to_pfn(buffer->pages[vma->vm_pgoff]),
+ vma->vm_end - vma->vm_start, vma->vm_page_prot);
}
static void *cma_heap_do_vmap(struct cma_heap_buffer *buffer)
--
2.17.1
