diff options
Diffstat (limited to 'drivers/gpu/ion/ion_heap.c')
| -rw-r--r-- | drivers/gpu/ion/ion_heap.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/gpu/ion/ion_heap.c b/drivers/gpu/ion/ion_heap.c index fee9c2a8b15..225ef94655d 100644 --- a/drivers/gpu/ion/ion_heap.c +++ b/drivers/gpu/ion/ion_heap.c @@ -93,6 +93,43 @@ int ion_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer, return 0; } +int ion_heap_buffer_zero(struct ion_buffer *buffer) +{ + struct sg_table *table = buffer->sg_table; + pgprot_t pgprot; + struct scatterlist *sg; + struct vm_struct *vm_struct; + int i, j, ret = 0; + + if (buffer->flags & ION_FLAG_CACHED) + pgprot = PAGE_KERNEL; + else + pgprot = pgprot_writecombine(PAGE_KERNEL); + + vm_struct = get_vm_area(PAGE_SIZE, VM_ALLOC); + if (!vm_struct) + return -ENOMEM; + + for_each_sg(table->sgl, sg, table->nents, i) { + struct page *page = sg_page(sg); + unsigned long len = sg_dma_len(sg); + + for (j = 0; j < len / PAGE_SIZE; j++) { + struct page *sub_page = page + j; + struct page **pages = &sub_page; + ret = map_vm_area(vm_struct, pgprot, &pages); + if (ret) + goto end; + memset(vm_struct->addr, 0, PAGE_SIZE); + unmap_kernel_range((unsigned long)vm_struct->addr, + PAGE_SIZE); + } + } +end: + free_vm_area(vm_struct); + return ret; +} + struct ion_heap *ion_heap_create(struct ion_platform_heap *heap_data) { struct ion_heap *heap = NULL; |