Commit f121ecfe authored by Thomas Hellstrom's avatar Thomas Hellstrom Committed by Dave Airlie
Browse files

drm/ttm: powerpc: Fix Highmem cache flushing. 



Temporarily maps highmem pages while flushing to get a valid virtual
address to flush.

Signed-off-by: default avatarThomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 73ba651f

drivers/gpu/drm/ttm/ttm_tt.c

+10 −4
Original line number Diff line number Diff line
@@ -86,10 +86,16 @@ void ttm_tt_cache_flush(struct page *pages[], unsigned long num_pages) 
	unsigned long i;



	for (i = 0; i < num_pages; ++i) {

		if (pages[i]) {

			unsigned long start = (unsigned long)page_address(pages[i]);

			flush_dcache_range(start, start + PAGE_SIZE);

		}

		struct page *page = pages[i];

		void *page_virtual;



		if (unlikely(page == NULL))

			continue;



		page_virtual = kmap_atomic(page, KM_USER0);

		flush_dcache_range((unsigned long) page_virtual,

				   (unsigned long) page_virtual + PAGE_SIZE);

		kunmap_atomic(page_virtual, KM_USER0);

	}

#else

	if (on_each_cpu(ttm_tt_ipi_handler, NULL, 1) != 0)