[PATCH] drm/exynos: Add fallback option to get non physically contiguous memory for gem_dumb_create

[Vikas Sajjan]

adding linux-samsung-soc mailing list and Dave Airlie.

On Fri, Aug 23, 2013 at 12:05 PM, Vikas Sajjan <vikas.sajjan at linaro.org> wrote:
> 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 at linaro.org>
> Signed-off-by: Arun Kumar <arun.kk at samsung.com>
> ---
>  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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