[RFC v5 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 c640935..49eebe9 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_ipp.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_ipp.c
@@ -24,6 +24,7 @@
 #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
@@ -1771,10 +1772,24 @@ 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);
@@ -1791,6 +1806,9 @@ 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