Temporarily maps highmem pages while flushing to get a valid virtual
address to flush.
Signed-off-by: Thomas Hellstrom <thellst...@vmware.com>
---
drivers/gpu/drm/ttm/ttm_tt.c | 14 ++++++++++----
1 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index 914a756..44f53a1 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -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)
--
1.5.4.3
------------------------------------------------------------------------------
--
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