This patch fixes the problem of mapping contigous dma buffers. Currently page struct is calculated from the buf->dma_addr which is not the physical address. It is replaced by buf->pages which points to the page struct of the first page of contigous memory chunk. This gives the correct page frame number for mapping.
Signed-off-by: Rahul Sharma rahul.sharma@samsung.com --- drivers/gpu/drm/exynos/exynos_drm_gem.c | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c index c557ac7..50d73f1 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_gem.c +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c @@ -120,8 +120,12 @@ static int exynos_drm_gem_map_buf(struct drm_gem_object *obj, }
pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset; - } else - pfn = (buf->dma_addr >> PAGE_SHIFT) + page_offset; + } else { + if (!buf->pages) + return -EINTR; + + pfn = page_to_pfn(buf->pages[0]) + page_offset; + }
return vm_insert_mixed(vma, f_vaddr, pfn); }