From 0b6b2cde0928707a618ce8c07970219f21d066e5 Mon Sep 17 00:00:00 2001 From: Rebecca Schultz Zavin Date: Fri, 13 Dec 2013 14:24:32 -0800 Subject: gpu: ion: Refactor the code to zero buffers Refactor the code in the system heap used to map and zero the buffers into a seperate utility so it can be called from other heaps. Use it from the chunk heap. Signed-off-by: Rebecca Schultz Zavin [jstultz: modified patch to apply to staging directory] Signed-off-by: John Stultz Signed-off-by: Greg Kroah-Hartman --- drivers/staging/android/ion/ion_heap.c | 37 ++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) (limited to 'drivers/staging/android/ion/ion_heap.c') diff --git a/drivers/staging/android/ion/ion_heap.c b/drivers/staging/android/ion/ion_heap.c index a9bf52e4d6f1..11066a2abb4b 100644 --- a/drivers/staging/android/ion/ion_heap.c +++ b/drivers/staging/android/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; -- cgit v1.2.3-59-g8ed1b