[14/18] drm/exynos: Consolidate IOMMU mapping code

Now that arch/arm is wired up for default domains and iommu-dma, we can
consolidate the shared mapping code onto the generic IOMMU API version,
and retire the arch-specific implementation.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>

---
This is a cheeky revert of 07dc3678bacc ("drm/exynos: Fix cleanup of
IOMMU related objects"), plus removal of the remaining arm_iommu_*
references on top.
---
 drivers/gpu/drm/exynos/exynos5433_drm_decon.c |  5 +-
 drivers/gpu/drm/exynos/exynos7_drm_decon.c    |  5 +-
 drivers/gpu/drm/exynos/exynos_drm_dma.c       | 61 +++----------------
 drivers/gpu/drm/exynos/exynos_drm_drv.h       |  6 +-
 drivers/gpu/drm/exynos/exynos_drm_fimc.c      |  5 +-
 drivers/gpu/drm/exynos/exynos_drm_fimd.c      |  5 +-
 drivers/gpu/drm/exynos/exynos_drm_g2d.c       |  5 +-
 drivers/gpu/drm/exynos/exynos_drm_gsc.c       |  5 +-
 drivers/gpu/drm/exynos/exynos_drm_rotator.c   |  5 +-
 drivers/gpu/drm/exynos/exynos_drm_scaler.c    |  6 +-
 drivers/gpu/drm/exynos/exynos_mixer.c         |  7 +--
 11 files changed, 29 insertions(+), 86 deletions(-)

Hi Robin,

On 20.08.2020 17:08, Robin Murphy wrote:
> Now that arch/arm is wired up for default domains and iommu-dma, we can
> consolidate the shared mapping code onto the generic IOMMU API version,
> and retire the arch-specific implementation.
>
> Signed-off-by: Robin Murphy <robin.murphy@arm.com>
>
> ---
> This is a cheeky revert of 07dc3678bacc ("drm/exynos: Fix cleanup of
> IOMMU related objects"), plus removal of the remaining arm_iommu_*
> references on top.

I have one more suggestion to this patch. Please rename 
exynos_drm_private->mapping to exynos_drm_private->domain and change its 
type from "void *" to "struct iommu_domain *". The "void *" was there to 
support both old-ARM and ARM64 IOMMU/DMA-mapping frameworks, but now we 
can use the proper pointer types.

> ---
>   drivers/gpu/drm/exynos/exynos5433_drm_decon.c |  5 +-
>   drivers/gpu/drm/exynos/exynos7_drm_decon.c    |  5 +-
>   drivers/gpu/drm/exynos/exynos_drm_dma.c       | 61 +++----------------
>   drivers/gpu/drm/exynos/exynos_drm_drv.h       |  6 +-
>   drivers/gpu/drm/exynos/exynos_drm_fimc.c      |  5 +-
>   drivers/gpu/drm/exynos/exynos_drm_fimd.c      |  5 +-
>   drivers/gpu/drm/exynos/exynos_drm_g2d.c       |  5 +-
>   drivers/gpu/drm/exynos/exynos_drm_gsc.c       |  5 +-
>   drivers/gpu/drm/exynos/exynos_drm_rotator.c   |  5 +-
>   drivers/gpu/drm/exynos/exynos_drm_scaler.c    |  6 +-
>   drivers/gpu/drm/exynos/exynos_mixer.c         |  7 +--
>   11 files changed, 29 insertions(+), 86 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
> index 1f79bc2a881e..8428ae12dfa5 100644
> --- a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
> +++ b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
> @@ -55,7 +55,6 @@ static const char * const decon_clks_name[] = {
>   struct decon_context {
>   	struct device			*dev;
>   	struct drm_device		*drm_dev;
> -	void				*dma_priv;
>   	struct exynos_drm_crtc		*crtc;
>   	struct exynos_drm_plane		planes[WINDOWS_NR];
>   	struct exynos_drm_plane_config	configs[WINDOWS_NR];
> @@ -645,7 +644,7 @@ static int decon_bind(struct device *dev, struct device *master, void *data)
>   
>   	decon_clear_channels(ctx->crtc);
>   
> -	return exynos_drm_register_dma(drm_dev, dev, &ctx->dma_priv);
> +	return exynos_drm_register_dma(drm_dev, dev);
>   }
>   
>   static void decon_unbind(struct device *dev, struct device *master, void *data)
> @@ -655,7 +654,7 @@ static void decon_unbind(struct device *dev, struct device *master, void *data)
>   	decon_atomic_disable(ctx->crtc);
>   
>   	/* detach this sub driver from iommu mapping if supported. */
> -	exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev, &ctx->dma_priv);
> +	exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev);
>   }
>   
>   static const struct component_ops decon_component_ops = {
> diff --git a/drivers/gpu/drm/exynos/exynos7_drm_decon.c b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
> index f2d87a7445c7..e7b58097ccdc 100644
> --- a/drivers/gpu/drm/exynos/exynos7_drm_decon.c
> +++ b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
> @@ -40,7 +40,6 @@
>   struct decon_context {
>   	struct device			*dev;
>   	struct drm_device		*drm_dev;
> -	void				*dma_priv;
>   	struct exynos_drm_crtc		*crtc;
>   	struct exynos_drm_plane		planes[WINDOWS_NR];
>   	struct exynos_drm_plane_config	configs[WINDOWS_NR];
> @@ -128,13 +127,13 @@ static int decon_ctx_initialize(struct decon_context *ctx,
>   
>   	decon_clear_channels(ctx->crtc);
>   
> -	return exynos_drm_register_dma(drm_dev, ctx->dev, &ctx->dma_priv);
> +	return exynos_drm_register_dma(drm_dev, ctx->dev);
>   }
>   
>   static void decon_ctx_remove(struct decon_context *ctx)
>   {
>   	/* detach this sub driver from iommu mapping if supported. */
> -	exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev, &ctx->dma_priv);
> +	exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev);
>   }
>   
>   static u32 decon_calc_clkdiv(struct decon_context *ctx,
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dma.c b/drivers/gpu/drm/exynos/exynos_drm_dma.c
> index 58b89ec11b0e..fd5f9bcf1857 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dma.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dma.c
> @@ -14,19 +14,6 @@
>   
>   #include "exynos_drm_drv.h"
>   
> -#if defined(CONFIG_ARM_DMA_USE_IOMMU)
> -#include <asm/dma-iommu.h>
> -#else
> -#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
> @@ -58,7 +45,7 @@ static inline void clear_dma_max_seg_size(struct device *dev)
>    * mapping.
>    */
>   static int drm_iommu_attach_device(struct drm_device *drm_dev,
> -				struct device *subdrv_dev, void **dma_priv)
> +				struct device *subdrv_dev)
>   {
>   	struct exynos_drm_private *priv = drm_dev->dev_private;
>   	int ret = 0;
> @@ -73,22 +60,7 @@ static int drm_iommu_attach_device(struct drm_device *drm_dev,
>   	if (ret)
>   		return ret;
>   
> -	if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) {
> -		/*
> -		 * Keep the original DMA mapping of the sub-device and
> -		 * restore it on Exynos DRM detach, otherwise the DMA
> -		 * framework considers it as IOMMU-less during the next
> -		 * probe (in case of deferred probe or modular build)
> -		 */
> -		*dma_priv = to_dma_iommu_mapping(subdrv_dev);
> -		if (*dma_priv)
> -			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);
> -	}
> -
> +	ret = iommu_attach_device(priv->mapping, subdrv_dev);
>   	if (ret)
>   		clear_dma_max_seg_size(subdrv_dev);
>   
> @@ -105,21 +77,15 @@ static int drm_iommu_attach_device(struct drm_device *drm_dev,
>    * mapping
>    */
>   static void drm_iommu_detach_device(struct drm_device *drm_dev,
> -				    struct device *subdrv_dev, void **dma_priv)
> +				struct device *subdrv_dev)
>   {
>   	struct exynos_drm_private *priv = drm_dev->dev_private;
>   
> -	if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) {
> -		arm_iommu_detach_device(subdrv_dev);
> -		arm_iommu_attach_device(subdrv_dev, *dma_priv);
> -	} else if (IS_ENABLED(CONFIG_IOMMU_DMA))
> -		iommu_detach_device(priv->mapping, subdrv_dev);
> -
> +	iommu_detach_device(priv->mapping, subdrv_dev);
>   	clear_dma_max_seg_size(subdrv_dev);
>   }
>   
> -int exynos_drm_register_dma(struct drm_device *drm, struct device *dev,
> -			    void **dma_priv)
> +int exynos_drm_register_dma(struct drm_device *drm, struct device *dev)
>   {
>   	struct exynos_drm_private *priv = drm->dev_private;
>   
> @@ -133,27 +99,20 @@ int exynos_drm_register_dma(struct drm_device *drm, struct device *dev,
>   		return 0;
>   
>   	if (!priv->mapping) {
> -		void *mapping;
> -
> -		if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU))
> -			mapping = arm_iommu_create_mapping(&platform_bus_type,
> -				EXYNOS_DEV_ADDR_START, EXYNOS_DEV_ADDR_SIZE);
> -		else if (IS_ENABLED(CONFIG_IOMMU_DMA))
> -			mapping = iommu_get_domain_for_dev(priv->dma_dev);
> +		void *mapping = iommu_get_domain_for_dev(priv->dma_dev);
>   
>   		if (IS_ERR(mapping))
>   			return PTR_ERR(mapping);
>   		priv->mapping = mapping;
>   	}
>   
> -	return drm_iommu_attach_device(drm, dev, dma_priv);
> +	return drm_iommu_attach_device(drm, dev);
>   }
>   
> -void exynos_drm_unregister_dma(struct drm_device *drm, struct device *dev,
> -			       void **dma_priv)
> +void exynos_drm_unregister_dma(struct drm_device *drm, struct device *dev)
>   {
>   	if (IS_ENABLED(CONFIG_EXYNOS_IOMMU))
> -		drm_iommu_detach_device(drm, dev, dma_priv);
> +		drm_iommu_detach_device(drm, dev);
>   }
>   
>   void exynos_drm_cleanup_dma(struct drm_device *drm)
> @@ -163,7 +122,5 @@ void exynos_drm_cleanup_dma(struct drm_device *drm)
>   	if (!IS_ENABLED(CONFIG_EXYNOS_IOMMU))
>   		return;
>   
> -	arm_iommu_release_mapping(priv->mapping);
> -	priv->mapping = NULL;
>   	priv->dma_dev = NULL;
>   }
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
> index 6ae9056e7a18..d4d21d8cfb90 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
> @@ -223,10 +223,8 @@ static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
>   	return priv->mapping ? true : false;
>   }
>   
> -int exynos_drm_register_dma(struct drm_device *drm, struct device *dev,
> -			    void **dma_priv);
> -void exynos_drm_unregister_dma(struct drm_device *drm, struct device *dev,
> -			       void **dma_priv);
> +int exynos_drm_register_dma(struct drm_device *drm, struct device *dev);
> +void exynos_drm_unregister_dma(struct drm_device *drm, struct device *dev);
>   void exynos_drm_cleanup_dma(struct drm_device *drm);
>   
>   #ifdef CONFIG_DRM_EXYNOS_DPI
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimc.c b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
> index 29ab8be8604c..8ea2e1d77802 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fimc.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
> @@ -97,7 +97,6 @@ struct fimc_scaler {
>   struct fimc_context {
>   	struct exynos_drm_ipp ipp;
>   	struct drm_device *drm_dev;
> -	void		*dma_priv;
>   	struct device	*dev;
>   	struct exynos_drm_ipp_task	*task;
>   	struct exynos_drm_ipp_formats	*formats;
> @@ -1134,7 +1133,7 @@ static int fimc_bind(struct device *dev, struct device *master, void *data)
>   
>   	ctx->drm_dev = drm_dev;
>   	ipp->drm_dev = drm_dev;
> -	exynos_drm_register_dma(drm_dev, dev, &ctx->dma_priv);
> +	exynos_drm_register_dma(drm_dev, dev);
>   
>   	exynos_drm_ipp_register(dev, ipp, &ipp_funcs,
>   			DRM_EXYNOS_IPP_CAP_CROP | DRM_EXYNOS_IPP_CAP_ROTATE |
> @@ -1154,7 +1153,7 @@ static void fimc_unbind(struct device *dev, struct device *master,
>   	struct exynos_drm_ipp *ipp = &ctx->ipp;
>   
>   	exynos_drm_ipp_unregister(dev, ipp);
> -	exynos_drm_unregister_dma(drm_dev, dev, &ctx->dma_priv);
> +	exynos_drm_unregister_dma(drm_dev, dev);
>   }
>   
>   static const struct component_ops fimc_component_ops = {
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> index bb67cad8371f..21aec38702fc 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> @@ -167,7 +167,6 @@ static struct fimd_driver_data exynos5420_fimd_driver_data = {
>   struct fimd_context {
>   	struct device			*dev;
>   	struct drm_device		*drm_dev;
> -	void				*dma_priv;
>   	struct exynos_drm_crtc		*crtc;
>   	struct exynos_drm_plane		planes[WINDOWS_NR];
>   	struct exynos_drm_plane_config	configs[WINDOWS_NR];
> @@ -1091,7 +1090,7 @@ static int fimd_bind(struct device *dev, struct device *master, void *data)
>   	if (is_drm_iommu_supported(drm_dev))
>   		fimd_clear_channels(ctx->crtc);
>   
> -	return exynos_drm_register_dma(drm_dev, dev, &ctx->dma_priv);
> +	return exynos_drm_register_dma(drm_dev, dev);
>   }
>   
>   static void fimd_unbind(struct device *dev, struct device *master,
> @@ -1101,7 +1100,7 @@ static void fimd_unbind(struct device *dev, struct device *master,
>   
>   	fimd_atomic_disable(ctx->crtc);
>   
> -	exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev, &ctx->dma_priv);
> +	exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev);
>   
>   	if (ctx->encoder)
>   		exynos_dpi_remove(ctx->encoder);
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> index 03be31427181..256ceafd9945 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> @@ -232,7 +232,6 @@ struct g2d_runqueue_node {
>   
>   struct g2d_data {
>   	struct device			*dev;
> -	void				*dma_priv;
>   	struct clk			*gate_clk;
>   	void __iomem			*regs;
>   	int				irq;
> @@ -1410,7 +1409,7 @@ static int g2d_bind(struct device *dev, struct device *master, void *data)
>   		return ret;
>   	}
>   
> -	ret = exynos_drm_register_dma(drm_dev, dev, &g2d->dma_priv);
> +	ret = exynos_drm_register_dma(drm_dev, dev);
>   	if (ret < 0) {
>   		dev_err(dev, "failed to enable iommu.\n");
>   		g2d_fini_cmdlist(g2d);
> @@ -1435,7 +1434,7 @@ static void g2d_unbind(struct device *dev, struct device *master, void *data)
>   	priv->g2d_dev = NULL;
>   
>   	cancel_work_sync(&g2d->runqueue_work);
> -	exynos_drm_unregister_dma(g2d->drm_dev, dev, &g2d->dma_priv);
> +	exynos_drm_unregister_dma(g2d->drm_dev, dev);
>   }
>   
>   static const struct component_ops g2d_component_ops = {
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_gsc.c b/drivers/gpu/drm/exynos/exynos_drm_gsc.c
> index 45e9aee8366a..88b6fcaa20be 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_gsc.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_gsc.c
> @@ -97,7 +97,6 @@ struct gsc_scaler {
>   struct gsc_context {
>   	struct exynos_drm_ipp ipp;
>   	struct drm_device *drm_dev;
> -	void		*dma_priv;
>   	struct device	*dev;
>   	struct exynos_drm_ipp_task	*task;
>   	struct exynos_drm_ipp_formats	*formats;
> @@ -1170,7 +1169,7 @@ static int gsc_bind(struct device *dev, struct device *master, void *data)
>   
>   	ctx->drm_dev = drm_dev;
>   	ctx->drm_dev = drm_dev;
> -	exynos_drm_register_dma(drm_dev, dev, &ctx->dma_priv);
> +	exynos_drm_register_dma(drm_dev, dev);
>   
>   	exynos_drm_ipp_register(dev, ipp, &ipp_funcs,
>   			DRM_EXYNOS_IPP_CAP_CROP | DRM_EXYNOS_IPP_CAP_ROTATE |
> @@ -1190,7 +1189,7 @@ static void gsc_unbind(struct device *dev, struct device *master,
>   	struct exynos_drm_ipp *ipp = &ctx->ipp;
>   
>   	exynos_drm_ipp_unregister(dev, ipp);
> -	exynos_drm_unregister_dma(drm_dev, dev, &ctx->dma_priv);
> +	exynos_drm_unregister_dma(drm_dev, dev);
>   }
>   
>   static const struct component_ops gsc_component_ops = {
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_rotator.c b/drivers/gpu/drm/exynos/exynos_drm_rotator.c
> index 2d94afba031e..f22fa0d2621a 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_rotator.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_rotator.c
> @@ -56,7 +56,6 @@ struct rot_variant {
>   struct rot_context {
>   	struct exynos_drm_ipp ipp;
>   	struct drm_device *drm_dev;
> -	void		*dma_priv;
>   	struct device	*dev;
>   	void __iomem	*regs;
>   	struct clk	*clock;
> @@ -244,7 +243,7 @@ static int rotator_bind(struct device *dev, struct device *master, void *data)
>   
>   	rot->drm_dev = drm_dev;
>   	ipp->drm_dev = drm_dev;
> -	exynos_drm_register_dma(drm_dev, dev, &rot->dma_priv);
> +	exynos_drm_register_dma(drm_dev, dev);
>   
>   	exynos_drm_ipp_register(dev, ipp, &ipp_funcs,
>   			   DRM_EXYNOS_IPP_CAP_CROP | DRM_EXYNOS_IPP_CAP_ROTATE,
> @@ -262,7 +261,7 @@ static void rotator_unbind(struct device *dev, struct device *master,
>   	struct exynos_drm_ipp *ipp = &rot->ipp;
>   
>   	exynos_drm_ipp_unregister(dev, ipp);
> -	exynos_drm_unregister_dma(rot->drm_dev, rot->dev, &rot->dma_priv);
> +	exynos_drm_unregister_dma(rot->drm_dev, rot->dev);
>   }
>   
>   static const struct component_ops rotator_component_ops = {
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_scaler.c b/drivers/gpu/drm/exynos/exynos_drm_scaler.c
> index ce1857138f89..0c560566bd2e 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_scaler.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_scaler.c
> @@ -39,7 +39,6 @@ struct scaler_data {
>   struct scaler_context {
>   	struct exynos_drm_ipp		ipp;
>   	struct drm_device		*drm_dev;
> -	void				*dma_priv;
>   	struct device			*dev;
>   	void __iomem			*regs;
>   	struct clk			*clock[SCALER_MAX_CLK];
> @@ -451,7 +450,7 @@ static int scaler_bind(struct device *dev, struct device *master, void *data)
>   
>   	scaler->drm_dev = drm_dev;
>   	ipp->drm_dev = drm_dev;
> -	exynos_drm_register_dma(drm_dev, dev, &scaler->dma_priv);
> +	exynos_drm_register_dma(drm_dev, dev);
>   
>   	exynos_drm_ipp_register(dev, ipp, &ipp_funcs,
>   			DRM_EXYNOS_IPP_CAP_CROP | DRM_EXYNOS_IPP_CAP_ROTATE |
> @@ -471,8 +470,7 @@ static void scaler_unbind(struct device *dev, struct device *master,
>   	struct exynos_drm_ipp *ipp = &scaler->ipp;
>   
>   	exynos_drm_ipp_unregister(dev, ipp);
> -	exynos_drm_unregister_dma(scaler->drm_dev, scaler->dev,
> -				  &scaler->dma_priv);
> +	exynos_drm_unregister_dma(scaler->drm_dev, scaler->dev);
>   }
>   
>   static const struct component_ops scaler_component_ops = {
> diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
> index af192e5a16ef..18972e605c5d 100644
> --- a/drivers/gpu/drm/exynos/exynos_mixer.c
> +++ b/drivers/gpu/drm/exynos/exynos_mixer.c
> @@ -94,7 +94,6 @@ struct mixer_context {
>   	struct platform_device *pdev;
>   	struct device		*dev;
>   	struct drm_device	*drm_dev;
> -	void			*dma_priv;
>   	struct exynos_drm_crtc	*crtc;
>   	struct exynos_drm_plane	planes[MIXER_WIN_NR];
>   	unsigned long		flags;
> @@ -895,14 +894,12 @@ static int mixer_initialize(struct mixer_context *mixer_ctx,
>   		}
>   	}
>   
> -	return exynos_drm_register_dma(drm_dev, mixer_ctx->dev,
> -				       &mixer_ctx->dma_priv);
> +	return exynos_drm_register_dma(drm_dev, mixer_ctx->dev);
>   }
>   
>   static void mixer_ctx_remove(struct mixer_context *mixer_ctx)
>   {
> -	exynos_drm_unregister_dma(mixer_ctx->drm_dev, mixer_ctx->dev,
> -				  &mixer_ctx->dma_priv);
> +	exynos_drm_unregister_dma(mixer_ctx->drm_dev, mixer_ctx->dev);
>   }
>   
>   static int mixer_enable_vblank(struct exynos_drm_crtc *crtc)

Best regards

20. 8. 21. 오전 12:08에 Robin Murphy 이(가) 쓴 글:
> Now that arch/arm is wired up for default domains and iommu-dma, we can
> consolidate the shared mapping code onto the generic IOMMU API version,
> and retire the arch-specific implementation.
> 
> Signed-off-by: Robin Murphy <robin.murphy@arm.com>
> 
> ---
> This is a cheeky revert of 07dc3678bacc ("drm/exynos: Fix cleanup of
> IOMMU related objects"), plus removal of the remaining arm_iommu_*
> references on top.

Thanks for cleanup.

Acked-by: Inki Dae <inki.dae@samsung.com>

Thanks,
Inki Dae

> ---
>  drivers/gpu/drm/exynos/exynos5433_drm_decon.c |  5 +-
>  drivers/gpu/drm/exynos/exynos7_drm_decon.c    |  5 +-
>  drivers/gpu/drm/exynos/exynos_drm_dma.c       | 61 +++----------------
>  drivers/gpu/drm/exynos/exynos_drm_drv.h       |  6 +-
>  drivers/gpu/drm/exynos/exynos_drm_fimc.c      |  5 +-
>  drivers/gpu/drm/exynos/exynos_drm_fimd.c      |  5 +-
>  drivers/gpu/drm/exynos/exynos_drm_g2d.c       |  5 +-
>  drivers/gpu/drm/exynos/exynos_drm_gsc.c       |  5 +-
>  drivers/gpu/drm/exynos/exynos_drm_rotator.c   |  5 +-
>  drivers/gpu/drm/exynos/exynos_drm_scaler.c    |  6 +-
>  drivers/gpu/drm/exynos/exynos_mixer.c         |  7 +--
>  11 files changed, 29 insertions(+), 86 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
> index 1f79bc2a881e..8428ae12dfa5 100644
> --- a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
> +++ b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
> @@ -55,7 +55,6 @@ static const char * const decon_clks_name[] = {
>  struct decon_context {
>  	struct device			*dev;
>  	struct drm_device		*drm_dev;
> -	void				*dma_priv;
>  	struct exynos_drm_crtc		*crtc;
>  	struct exynos_drm_plane		planes[WINDOWS_NR];
>  	struct exynos_drm_plane_config	configs[WINDOWS_NR];
> @@ -645,7 +644,7 @@ static int decon_bind(struct device *dev, struct device *master, void *data)
>  
>  	decon_clear_channels(ctx->crtc);
>  
> -	return exynos_drm_register_dma(drm_dev, dev, &ctx->dma_priv);
> +	return exynos_drm_register_dma(drm_dev, dev);
>  }
>  
>  static void decon_unbind(struct device *dev, struct device *master, void *data)
> @@ -655,7 +654,7 @@ static void decon_unbind(struct device *dev, struct device *master, void *data)
>  	decon_atomic_disable(ctx->crtc);
>  
>  	/* detach this sub driver from iommu mapping if supported. */
> -	exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev, &ctx->dma_priv);
> +	exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev);
>  }
>  
>  static const struct component_ops decon_component_ops = {
> diff --git a/drivers/gpu/drm/exynos/exynos7_drm_decon.c b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
> index f2d87a7445c7..e7b58097ccdc 100644
> --- a/drivers/gpu/drm/exynos/exynos7_drm_decon.c
> +++ b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
> @@ -40,7 +40,6 @@
>  struct decon_context {
>  	struct device			*dev;
>  	struct drm_device		*drm_dev;
> -	void				*dma_priv;
>  	struct exynos_drm_crtc		*crtc;
>  	struct exynos_drm_plane		planes[WINDOWS_NR];
>  	struct exynos_drm_plane_config	configs[WINDOWS_NR];
> @@ -128,13 +127,13 @@ static int decon_ctx_initialize(struct decon_context *ctx,
>  
>  	decon_clear_channels(ctx->crtc);
>  
> -	return exynos_drm_register_dma(drm_dev, ctx->dev, &ctx->dma_priv);
> +	return exynos_drm_register_dma(drm_dev, ctx->dev);
>  }
>  
>  static void decon_ctx_remove(struct decon_context *ctx)
>  {
>  	/* detach this sub driver from iommu mapping if supported. */
> -	exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev, &ctx->dma_priv);
> +	exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev);
>  }
>  
>  static u32 decon_calc_clkdiv(struct decon_context *ctx,
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dma.c b/drivers/gpu/drm/exynos/exynos_drm_dma.c
> index 58b89ec11b0e..fd5f9bcf1857 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dma.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dma.c
> @@ -14,19 +14,6 @@
>  
>  #include "exynos_drm_drv.h"
>  
> -#if defined(CONFIG_ARM_DMA_USE_IOMMU)
> -#include <asm/dma-iommu.h>
> -#else
> -#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
> @@ -58,7 +45,7 @@ static inline void clear_dma_max_seg_size(struct device *dev)
>   * mapping.
>   */
>  static int drm_iommu_attach_device(struct drm_device *drm_dev,
> -				struct device *subdrv_dev, void **dma_priv)
> +				struct device *subdrv_dev)
>  {
>  	struct exynos_drm_private *priv = drm_dev->dev_private;
>  	int ret = 0;
> @@ -73,22 +60,7 @@ static int drm_iommu_attach_device(struct drm_device *drm_dev,
>  	if (ret)
>  		return ret;
>  
> -	if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) {
> -		/*
> -		 * Keep the original DMA mapping of the sub-device and
> -		 * restore it on Exynos DRM detach, otherwise the DMA
> -		 * framework considers it as IOMMU-less during the next
> -		 * probe (in case of deferred probe or modular build)
> -		 */
> -		*dma_priv = to_dma_iommu_mapping(subdrv_dev);
> -		if (*dma_priv)
> -			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);
> -	}
> -
> +	ret = iommu_attach_device(priv->mapping, subdrv_dev);
>  	if (ret)
>  		clear_dma_max_seg_size(subdrv_dev);
>  
> @@ -105,21 +77,15 @@ static int drm_iommu_attach_device(struct drm_device *drm_dev,
>   * mapping
>   */
>  static void drm_iommu_detach_device(struct drm_device *drm_dev,
> -				    struct device *subdrv_dev, void **dma_priv)
> +				struct device *subdrv_dev)
>  {
>  	struct exynos_drm_private *priv = drm_dev->dev_private;
>  
> -	if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) {
> -		arm_iommu_detach_device(subdrv_dev);
> -		arm_iommu_attach_device(subdrv_dev, *dma_priv);
> -	} else if (IS_ENABLED(CONFIG_IOMMU_DMA))
> -		iommu_detach_device(priv->mapping, subdrv_dev);
> -
> +	iommu_detach_device(priv->mapping, subdrv_dev);
>  	clear_dma_max_seg_size(subdrv_dev);
>  }
>  
> -int exynos_drm_register_dma(struct drm_device *drm, struct device *dev,
> -			    void **dma_priv)
> +int exynos_drm_register_dma(struct drm_device *drm, struct device *dev)
>  {
>  	struct exynos_drm_private *priv = drm->dev_private;
>  
> @@ -133,27 +99,20 @@ int exynos_drm_register_dma(struct drm_device *drm, struct device *dev,
>  		return 0;
>  
>  	if (!priv->mapping) {
> -		void *mapping;
> -
> -		if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU))
> -			mapping = arm_iommu_create_mapping(&platform_bus_type,
> -				EXYNOS_DEV_ADDR_START, EXYNOS_DEV_ADDR_SIZE);
> -		else if (IS_ENABLED(CONFIG_IOMMU_DMA))
> -			mapping = iommu_get_domain_for_dev(priv->dma_dev);
> +		void *mapping = iommu_get_domain_for_dev(priv->dma_dev);
>  
>  		if (IS_ERR(mapping))
>  			return PTR_ERR(mapping);
>  		priv->mapping = mapping;
>  	}
>  
> -	return drm_iommu_attach_device(drm, dev, dma_priv);
> +	return drm_iommu_attach_device(drm, dev);
>  }
>  
> -void exynos_drm_unregister_dma(struct drm_device *drm, struct device *dev,
> -			       void **dma_priv)
> +void exynos_drm_unregister_dma(struct drm_device *drm, struct device *dev)
>  {
>  	if (IS_ENABLED(CONFIG_EXYNOS_IOMMU))
> -		drm_iommu_detach_device(drm, dev, dma_priv);
> +		drm_iommu_detach_device(drm, dev);
>  }
>  
>  void exynos_drm_cleanup_dma(struct drm_device *drm)
> @@ -163,7 +122,5 @@ void exynos_drm_cleanup_dma(struct drm_device *drm)
>  	if (!IS_ENABLED(CONFIG_EXYNOS_IOMMU))
>  		return;
>  
> -	arm_iommu_release_mapping(priv->mapping);
> -	priv->mapping = NULL;
>  	priv->dma_dev = NULL;
>  }
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
> index 6ae9056e7a18..d4d21d8cfb90 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
> @@ -223,10 +223,8 @@ static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
>  	return priv->mapping ? true : false;
>  }
>  
> -int exynos_drm_register_dma(struct drm_device *drm, struct device *dev,
> -			    void **dma_priv);
> -void exynos_drm_unregister_dma(struct drm_device *drm, struct device *dev,
> -			       void **dma_priv);
> +int exynos_drm_register_dma(struct drm_device *drm, struct device *dev);
> +void exynos_drm_unregister_dma(struct drm_device *drm, struct device *dev);
>  void exynos_drm_cleanup_dma(struct drm_device *drm);
>  
>  #ifdef CONFIG_DRM_EXYNOS_DPI
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimc.c b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
> index 29ab8be8604c..8ea2e1d77802 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fimc.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
> @@ -97,7 +97,6 @@ struct fimc_scaler {
>  struct fimc_context {
>  	struct exynos_drm_ipp ipp;
>  	struct drm_device *drm_dev;
> -	void		*dma_priv;
>  	struct device	*dev;
>  	struct exynos_drm_ipp_task	*task;
>  	struct exynos_drm_ipp_formats	*formats;
> @@ -1134,7 +1133,7 @@ static int fimc_bind(struct device *dev, struct device *master, void *data)
>  
>  	ctx->drm_dev = drm_dev;
>  	ipp->drm_dev = drm_dev;
> -	exynos_drm_register_dma(drm_dev, dev, &ctx->dma_priv);
> +	exynos_drm_register_dma(drm_dev, dev);
>  
>  	exynos_drm_ipp_register(dev, ipp, &ipp_funcs,
>  			DRM_EXYNOS_IPP_CAP_CROP | DRM_EXYNOS_IPP_CAP_ROTATE |
> @@ -1154,7 +1153,7 @@ static void fimc_unbind(struct device *dev, struct device *master,
>  	struct exynos_drm_ipp *ipp = &ctx->ipp;
>  
>  	exynos_drm_ipp_unregister(dev, ipp);
> -	exynos_drm_unregister_dma(drm_dev, dev, &ctx->dma_priv);
> +	exynos_drm_unregister_dma(drm_dev, dev);
>  }
>  
>  static const struct component_ops fimc_component_ops = {
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> index bb67cad8371f..21aec38702fc 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> @@ -167,7 +167,6 @@ static struct fimd_driver_data exynos5420_fimd_driver_data = {
>  struct fimd_context {
>  	struct device			*dev;
>  	struct drm_device		*drm_dev;
> -	void				*dma_priv;
>  	struct exynos_drm_crtc		*crtc;
>  	struct exynos_drm_plane		planes[WINDOWS_NR];
>  	struct exynos_drm_plane_config	configs[WINDOWS_NR];
> @@ -1091,7 +1090,7 @@ static int fimd_bind(struct device *dev, struct device *master, void *data)
>  	if (is_drm_iommu_supported(drm_dev))
>  		fimd_clear_channels(ctx->crtc);
>  
> -	return exynos_drm_register_dma(drm_dev, dev, &ctx->dma_priv);
> +	return exynos_drm_register_dma(drm_dev, dev);
>  }
>  
>  static void fimd_unbind(struct device *dev, struct device *master,
> @@ -1101,7 +1100,7 @@ static void fimd_unbind(struct device *dev, struct device *master,
>  
>  	fimd_atomic_disable(ctx->crtc);
>  
> -	exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev, &ctx->dma_priv);
> +	exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev);
>  
>  	if (ctx->encoder)
>  		exynos_dpi_remove(ctx->encoder);
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> index 03be31427181..256ceafd9945 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> @@ -232,7 +232,6 @@ struct g2d_runqueue_node {
>  
>  struct g2d_data {
>  	struct device			*dev;
> -	void				*dma_priv;
>  	struct clk			*gate_clk;
>  	void __iomem			*regs;
>  	int				irq;
> @@ -1410,7 +1409,7 @@ static int g2d_bind(struct device *dev, struct device *master, void *data)
>  		return ret;
>  	}
>  
> -	ret = exynos_drm_register_dma(drm_dev, dev, &g2d->dma_priv);
> +	ret = exynos_drm_register_dma(drm_dev, dev);
>  	if (ret < 0) {
>  		dev_err(dev, "failed to enable iommu.\n");
>  		g2d_fini_cmdlist(g2d);
> @@ -1435,7 +1434,7 @@ static void g2d_unbind(struct device *dev, struct device *master, void *data)
>  	priv->g2d_dev = NULL;
>  
>  	cancel_work_sync(&g2d->runqueue_work);
> -	exynos_drm_unregister_dma(g2d->drm_dev, dev, &g2d->dma_priv);
> +	exynos_drm_unregister_dma(g2d->drm_dev, dev);
>  }
>  
>  static const struct component_ops g2d_component_ops = {
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_gsc.c b/drivers/gpu/drm/exynos/exynos_drm_gsc.c
> index 45e9aee8366a..88b6fcaa20be 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_gsc.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_gsc.c
> @@ -97,7 +97,6 @@ struct gsc_scaler {
>  struct gsc_context {
>  	struct exynos_drm_ipp ipp;
>  	struct drm_device *drm_dev;
> -	void		*dma_priv;
>  	struct device	*dev;
>  	struct exynos_drm_ipp_task	*task;
>  	struct exynos_drm_ipp_formats	*formats;
> @@ -1170,7 +1169,7 @@ static int gsc_bind(struct device *dev, struct device *master, void *data)
>  
>  	ctx->drm_dev = drm_dev;
>  	ctx->drm_dev = drm_dev;
> -	exynos_drm_register_dma(drm_dev, dev, &ctx->dma_priv);
> +	exynos_drm_register_dma(drm_dev, dev);
>  
>  	exynos_drm_ipp_register(dev, ipp, &ipp_funcs,
>  			DRM_EXYNOS_IPP_CAP_CROP | DRM_EXYNOS_IPP_CAP_ROTATE |
> @@ -1190,7 +1189,7 @@ static void gsc_unbind(struct device *dev, struct device *master,
>  	struct exynos_drm_ipp *ipp = &ctx->ipp;
>  
>  	exynos_drm_ipp_unregister(dev, ipp);
> -	exynos_drm_unregister_dma(drm_dev, dev, &ctx->dma_priv);
> +	exynos_drm_unregister_dma(drm_dev, dev);
>  }
>  
>  static const struct component_ops gsc_component_ops = {
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_rotator.c b/drivers/gpu/drm/exynos/exynos_drm_rotator.c
> index 2d94afba031e..f22fa0d2621a 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_rotator.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_rotator.c
> @@ -56,7 +56,6 @@ struct rot_variant {
>  struct rot_context {
>  	struct exynos_drm_ipp ipp;
>  	struct drm_device *drm_dev;
> -	void		*dma_priv;
>  	struct device	*dev;
>  	void __iomem	*regs;
>  	struct clk	*clock;
> @@ -244,7 +243,7 @@ static int rotator_bind(struct device *dev, struct device *master, void *data)
>  
>  	rot->drm_dev = drm_dev;
>  	ipp->drm_dev = drm_dev;
> -	exynos_drm_register_dma(drm_dev, dev, &rot->dma_priv);
> +	exynos_drm_register_dma(drm_dev, dev);
>  
>  	exynos_drm_ipp_register(dev, ipp, &ipp_funcs,
>  			   DRM_EXYNOS_IPP_CAP_CROP | DRM_EXYNOS_IPP_CAP_ROTATE,
> @@ -262,7 +261,7 @@ static void rotator_unbind(struct device *dev, struct device *master,
>  	struct exynos_drm_ipp *ipp = &rot->ipp;
>  
>  	exynos_drm_ipp_unregister(dev, ipp);
> -	exynos_drm_unregister_dma(rot->drm_dev, rot->dev, &rot->dma_priv);
> +	exynos_drm_unregister_dma(rot->drm_dev, rot->dev);
>  }
>  
>  static const struct component_ops rotator_component_ops = {
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_scaler.c b/drivers/gpu/drm/exynos/exynos_drm_scaler.c
> index ce1857138f89..0c560566bd2e 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_scaler.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_scaler.c
> @@ -39,7 +39,6 @@ struct scaler_data {
>  struct scaler_context {
>  	struct exynos_drm_ipp		ipp;
>  	struct drm_device		*drm_dev;
> -	void				*dma_priv;
>  	struct device			*dev;
>  	void __iomem			*regs;
>  	struct clk			*clock[SCALER_MAX_CLK];
> @@ -451,7 +450,7 @@ static int scaler_bind(struct device *dev, struct device *master, void *data)
>  
>  	scaler->drm_dev = drm_dev;
>  	ipp->drm_dev = drm_dev;
> -	exynos_drm_register_dma(drm_dev, dev, &scaler->dma_priv);
> +	exynos_drm_register_dma(drm_dev, dev);
>  
>  	exynos_drm_ipp_register(dev, ipp, &ipp_funcs,
>  			DRM_EXYNOS_IPP_CAP_CROP | DRM_EXYNOS_IPP_CAP_ROTATE |
> @@ -471,8 +470,7 @@ static void scaler_unbind(struct device *dev, struct device *master,
>  	struct exynos_drm_ipp *ipp = &scaler->ipp;
>  
>  	exynos_drm_ipp_unregister(dev, ipp);
> -	exynos_drm_unregister_dma(scaler->drm_dev, scaler->dev,
> -				  &scaler->dma_priv);
> +	exynos_drm_unregister_dma(scaler->drm_dev, scaler->dev);
>  }
>  
>  static const struct component_ops scaler_component_ops = {
> diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
> index af192e5a16ef..18972e605c5d 100644
> --- a/drivers/gpu/drm/exynos/exynos_mixer.c
> +++ b/drivers/gpu/drm/exynos/exynos_mixer.c
> @@ -94,7 +94,6 @@ struct mixer_context {
>  	struct platform_device *pdev;
>  	struct device		*dev;
>  	struct drm_device	*drm_dev;
> -	void			*dma_priv;
>  	struct exynos_drm_crtc	*crtc;
>  	struct exynos_drm_plane	planes[MIXER_WIN_NR];
>  	unsigned long		flags;
> @@ -895,14 +894,12 @@ static int mixer_initialize(struct mixer_context *mixer_ctx,
>  		}
>  	}
>  
> -	return exynos_drm_register_dma(drm_dev, mixer_ctx->dev,
> -				       &mixer_ctx->dma_priv);
> +	return exynos_drm_register_dma(drm_dev, mixer_ctx->dev);
>  }
>  
>  static void mixer_ctx_remove(struct mixer_context *mixer_ctx)
>  {
> -	exynos_drm_unregister_dma(mixer_ctx->drm_dev, mixer_ctx->dev,
> -				  &mixer_ctx->dma_priv);
> +	exynos_drm_unregister_dma(mixer_ctx->drm_dev, mixer_ctx->dev);
>  }
>  
>  static int mixer_enable_vblank(struct exynos_drm_crtc *crtc)
>