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drm/exynos: Consider fallback option to allocation fail

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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@linaro.org>
Signed-off-by: Arun Kumar <arun.kk@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Vikas Sajjan 2013-08-23 12:05:06 +05:30 committed by Inki Dae
parent 562ad9f4a3
commit 3fec4532d1
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/exynos/exynos_drm_gem.c
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@ -18,6 +18,7 @@
#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);