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drm/exynos: iommu: add support for ARM64 specific code for IOMMU glue 

This patch adds support for ARM 64bit architecture with IOMMU-DMA glue
code, so Exynos DRM can be now used on Exynos 5433 with IOMMU enabled.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Marek Szyprowski 2016-06-17 09:54:27 +02:00 committed by Inki Dae
parent 17879a4100
commit 197adf0b7e
3 changed files with 57 additions and 7 deletions
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2
drivers/gpu/drm/exynos/Kconfig
View File

@ -15,7 +15,7 @@ if DRM_EXYNOS
config DRM_EXYNOS_IOMMU
bool
depends on EXYNOS_IOMMU && ARM_DMA_USE_IOMMU
depends on EXYNOS_IOMMU
default y
comment "CRTCs"

7
drivers/gpu/drm/exynos/exynos_drm_drv.c
View File

@ -159,12 +159,7 @@ static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
DRM_INFO("Exynos DRM: using %s device for DMA mapping operations\n",
dev_name(private->dma_dev));
/*
* create mapping to manage iommu table and set a pointer to iommu
* mapping structure to iommu_mapping of private data.
* also this iommu_mapping can be used to check if iommu is supported
* or not.
*/
/* create common IOMMU mapping for all devices attached to Exynos DRM */
ret = drm_create_iommu_mapping(dev);
if (ret < 0) {
DRM_ERROR("failed to create iommu mapping.\n");

55
drivers/gpu/drm/exynos/exynos_drm_iommu.h
View File

@ -49,6 +49,61 @@ static inline void __exynos_iommu_detach(struct exynos_drm_private *priv,
arm_iommu_detach_device(dev);
}
#elif defined(CONFIG_IOMMU_DMA)
#include <linux/dma-iommu.h>
static inline int __exynos_iommu_create_mapping(struct exynos_drm_private *priv,
unsigned long start, unsigned long size)
{
struct iommu_domain *domain;
int ret;
domain = iommu_domain_alloc(priv->dma_dev->bus);
if (!domain)
return -ENOMEM;
ret = iommu_get_dma_cookie(domain);
if (ret)
goto free_domain;
ret = iommu_dma_init_domain(domain, start, size);
if (ret)
goto put_cookie;
priv->mapping = domain;
return 0;
put_cookie:
iommu_put_dma_cookie(domain);
free_domain:
iommu_domain_free(domain);
return ret;
}
static inline void __exynos_iommu_release_mapping(struct exynos_drm_private *priv)
{
struct iommu_domain *domain = priv->mapping;
iommu_put_dma_cookie(domain);
iommu_domain_free(domain);
priv->mapping = NULL;
}
static inline int __exynos_iommu_attach(struct exynos_drm_private *priv,
struct device *dev)
{
struct iommu_domain *domain = priv->mapping;
return iommu_attach_device(domain, dev);
}
static inline void __exynos_iommu_detach(struct exynos_drm_private *priv,
struct device *dev)
{
struct iommu_domain *domain = priv->mapping;
iommu_detach_device(domain, dev);
}
#else
#error Unsupported architecture and IOMMU/DMA-mapping glue code
#endif