On 64-bit Tegras, buffer object memory allocation may
return memory above 4G that units behind Host1x cannot
access. Add the GFP_DMA flag to these allocation when
IOMMU is not enabled to ensure units can always access
BO memory.
Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
---
drivers/gpu/drm/tegra/gem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 19bf9cd..e36e6c5 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -233,7 +233,7 @@ static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
size_t size = bo->gem.size;
bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->paddr,
- GFP_KERNEL | __GFP_NOWARN);
+ GFP_KERNEL | GFP_DMA | __GFP_NOWARN);
if (!bo->vaddr) {
dev_err(drm->dev,
"failed to allocate buffer of size %zu\n",
--
2.10.2
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