To address the case where physically contiguous memory MAY NOT be a mandatory
requirement for framebuffer for the application calling exynos_drm_gem_dumb_create,
the patch adds a feature to get non physically contiguous memory for framebuffer,
if physically contiguous memory allocation fails and if IOMMU is supported.
Signed-off-by: Vikas Sajjan <vikas.sajjan@xxxxxxxxxx>
Signed-off-by: Arun Kumar <arun.kk@xxxxxxxxxxx>
---
drivers/gpu/drm/exynos/exynos_drm_gem.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index 2eabe1a..66d1b40 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -17,6 +17,7 @@
#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_buf.h"
+#include "exynos_drm_iommu.h"
static unsigned int convert_to_vm_err_msg(int msg)
{
@@ -666,6 +667,18 @@ int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG |
EXYNOS_BO_WC, args->size);
+ /*
+ * If physically contiguous memory allocation fails and if IOMMU is
+ * supported then try to get buffer from non physically contiguous
+ * memory area.
+ */
+ if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
+ dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
+ exynos_gem_obj = exynos_drm_gem_create(dev,
+ EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC,
+ args->size);
+ }
+
if (IS_ERR(exynos_gem_obj))
return PTR_ERR(exynos_gem_obj);
--
1.7.9.5
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