An application that doesn't need kernel mapping of the DMA memory it
allocates may specify DMA_ATTR_NO_KERNEL_MAPPING attribute to allocation
function. Support this attribute and return address of the first struct
page that covers the allocation.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
*handle = phys_to_dma(dev, page_to_phys(page));
+ if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) {
+ return page;
+ }
+
#ifdef CONFIG_MMU
if (PageHighMem(page)) {
void *p;
unsigned long addr = (unsigned long)vaddr;
struct page *page;
- if (addr >= XCHAL_KSEG_BYPASS_VADDR &&
- addr - XCHAL_KSEG_BYPASS_VADDR < XCHAL_KSEG_SIZE) {
+ if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) {
+ page = vaddr;
+ } else if (addr >= XCHAL_KSEG_BYPASS_VADDR &&
+ addr - XCHAL_KSEG_BYPASS_VADDR < XCHAL_KSEG_SIZE) {
addr += XCHAL_KSEG_CACHED_VADDR - XCHAL_KSEG_BYPASS_VADDR;
page = virt_to_page(addr);
} else {