drm/exynos: Consider fallback option to allocation fail
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>
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@ -18,6 +18,7 @@
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#include "exynos_drm_drv.h"
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#include "exynos_drm_gem.h"
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#include "exynos_drm_buf.h"
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#include "exynos_drm_iommu.h"
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static unsigned int convert_to_vm_err_msg(int msg)
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{
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@ -666,6 +667,18 @@ int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
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exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG |
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EXYNOS_BO_WC, args->size);
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/*
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* If physically contiguous memory allocation fails and if IOMMU is
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* supported then try to get buffer from non physically contiguous
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* memory area.
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*/
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if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
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dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
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exynos_gem_obj = exynos_drm_gem_create(dev,
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EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC,
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args->size);
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}
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if (IS_ERR(exynos_gem_obj))
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return PTR_ERR(exynos_gem_obj);
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