[RFC v2 2/5] drm/exynos: add iommu support for ipp

[Eunchul Kim]

This patch adds iommu support for ipp. For this, it
adds subdrv_probe/remove callback to enable or disable ipp iommu.
we can get or put device address to a gem handle from user
through exynos_drm_gem_get/put_dma_addr().

Signed-off-by: Eunchul Kim <chulspro.kim at samsung.com>
Signed-off-by: Jinyoung Jeon <jy0.jeon at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_ipp.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_ipp.c b/drivers/gpu/drm/exynos/exynos_drm_ipp.c
index 2d84477..c582300 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_ipp.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_ipp.c
@@ -23,6 +23,7 @@
 #include "exynos_drm_drv.h"
 #include "exynos_drm_gem.h"
 #include "exynos_drm_ipp.h"
+#include "exynos_drm_iommu.h"
 
 /*
  * IPP is stand for Image Post Processing and
@@ -1668,10 +1669,24 @@ static int ipp_subdrv_probe(struct drm_device *drm_dev, struct device *dev)
 		ippdrv->event_workq = ctx->event_workq;
 		ippdrv->sched_event = ipp_sched_event;
 		INIT_LIST_HEAD(&ippdrv->cmd_list);
+
+		if (is_drm_iommu_supported(drm_dev)) {
+			ret = drm_iommu_attach_device(drm_dev, ippdrv->dev);
+			if (ret) {
+				DRM_ERROR("failed to activate iommu\n");
+				goto err_iommu;
+			}
+		}
 	}
 
 	return 0;
 
+err_iommu:
+	/* get ipp driver entry */
+	list_for_each_entry_reverse(ippdrv, &exynos_drm_ippdrv_list, drv_list)
+		if (is_drm_iommu_supported(drm_dev))
+			drm_iommu_detach_device(drm_dev, ippdrv->dev);
+
 err_idr:
 	idr_remove_all(&ctx->ipp_idr);
 	idr_remove_all(&ctx->prop_idr);
@@ -1689,6 +1704,9 @@ static void ipp_subdrv_remove(struct drm_device *drm_dev, struct device *dev)
 
 	/* get ipp driver entry */
 	list_for_each_entry(ippdrv, &exynos_drm_ippdrv_list, drv_list) {
+		if (is_drm_iommu_supported(drm_dev))
+			drm_iommu_detach_device(drm_dev, ippdrv->dev);
+
 		ippdrv->drm_dev = NULL;
 		exynos_drm_ippdrv_unregister(ippdrv);
 	}
-- 
1.7.0.4