Using C conditionals is preferred solution - it provides better code coverage, makes code more clear.
Signed-off-by: Andrzej Hajda a.hajda@samsung.com --- drivers/gpu/drm/exynos/exynos_drm_iommu.c | 108 ++++++++-------------- 1 file changed, 36 insertions(+), 72 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.c b/drivers/gpu/drm/exynos/exynos_drm_iommu.c index 564f1529d77e..14558dedc043 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_iommu.c +++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.c @@ -12,84 +12,30 @@ #include <drm/drmP.h> #include <drm/exynos_drm.h>
+#include <linux/dma-iommu.h> #include <linux/dma-mapping.h> #include <linux/iommu.h>
#include "exynos_drm_drv.h" #include "exynos_drm_iommu.h"
-#define EXYNOS_DEV_ADDR_START 0x20000000 -#define EXYNOS_DEV_ADDR_SIZE 0x40000000 - #if defined(CONFIG_ARM_DMA_USE_IOMMU) #include <asm/dma-iommu.h> - -static inline int __exynos_iommu_create_mapping(struct exynos_drm_private *priv, - unsigned long start, unsigned long size) -{ - priv->mapping = arm_iommu_create_mapping(&platform_bus_type, start, - size); - return IS_ERR(priv->mapping); -} - -static inline void -__exynos_iommu_release_mapping(struct exynos_drm_private *priv) -{ - arm_iommu_release_mapping(priv->mapping); -} - -static inline int __exynos_iommu_attach(struct exynos_drm_private *priv, - struct device *dev) -{ - if (dev->archdata.mapping) - arm_iommu_detach_device(dev); - - return arm_iommu_attach_device(dev, priv->mapping); -} - -static inline void __exynos_iommu_detach(struct exynos_drm_private *priv, - struct device *dev) -{ - 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) -{ - priv->mapping = iommu_get_domain_for_dev(priv->dma_dev); - return 0; -} - -static inline void __exynos_iommu_release_mapping(struct exynos_drm_private *priv) -{ - priv->mapping = NULL; -} - -static inline int __exynos_iommu_attach(struct exynos_drm_private *priv, - struct device *dev) -{ - struct iommu_domain *domain = priv->mapping; - - if (dev != priv->dma_dev) - return iommu_attach_device(domain, dev); - return 0; -} - -static inline void __exynos_iommu_detach(struct exynos_drm_private *priv, - struct device *dev) -{ - struct iommu_domain *domain = priv->mapping; - - if (dev != priv->dma_dev) - iommu_detach_device(domain, dev); -} #else -#error Unsupported architecture and IOMMU/DMA-mapping glue code +#define arm_iommu_create_mapping(...) ({ NULL; }) +#define arm_iommu_attach_device(...) ({ -ENODEV; }) +#define arm_iommu_release_mapping(...) ({ }) +#define arm_iommu_detach_device(...) ({ }) +#define to_dma_iommu_mapping(dev) NULL #endif
+#if !defined(CONFIG_IOMMU_DMA) +#define iommu_dma_init_domain(...) ({ -EINVAL; }) +#endif + +#define EXYNOS_DEV_ADDR_START 0x20000000 +#define EXYNOS_DEV_ADDR_SIZE 0x40000000 + static inline int configure_dma_max_seg_size(struct device *dev) { if (!dev->dma_parms) @@ -116,8 +62,13 @@ int drm_create_iommu_mapping(struct drm_device *drm_dev) { struct exynos_drm_private *priv = drm_dev->dev_private;
- return __exynos_iommu_create_mapping(priv, EXYNOS_DEV_ADDR_START, - EXYNOS_DEV_ADDR_SIZE); + if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) + priv->mapping = arm_iommu_create_mapping(&platform_bus_type, + EXYNOS_DEV_ADDR_START, EXYNOS_DEV_ADDR_SIZE); + else if (IS_ENABLED(CONFIG_IOMMU_DMA)) + priv->mapping = iommu_get_domain_for_dev(priv->dma_dev); + + return IS_ERR(priv->mapping); }
/* @@ -129,7 +80,8 @@ void drm_release_iommu_mapping(struct drm_device *drm_dev) { struct exynos_drm_private *priv = drm_dev->dev_private;
- __exynos_iommu_release_mapping(priv); + arm_iommu_release_mapping(priv->mapping); + priv->mapping = NULL; }
/* @@ -157,7 +109,15 @@ int drm_iommu_attach_device(struct drm_device *drm_dev, if (ret) return ret;
- ret = __exynos_iommu_attach(priv, subdrv_dev); + if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) { + if (to_dma_iommu_mapping(subdrv_dev)) + arm_iommu_detach_device(subdrv_dev); + + ret = arm_iommu_attach_device(subdrv_dev, priv->mapping); + } else if (IS_ENABLED(CONFIG_IOMMU_DMA)) { + ret = iommu_attach_device(priv->mapping, subdrv_dev); + } + if (ret) clear_dma_max_seg_size(subdrv_dev);
@@ -178,6 +138,10 @@ void drm_iommu_detach_device(struct drm_device *drm_dev, { struct exynos_drm_private *priv = drm_dev->dev_private;
- __exynos_iommu_detach(priv, subdrv_dev); + if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) + arm_iommu_detach_device(subdrv_dev); + else if (IS_ENABLED(CONFIG_IOMMU_DMA)) + iommu_detach_device(priv->mapping, subdrv_dev); + clear_dma_max_seg_size(subdrv_dev); }