[PATCH v2 2/4] drm/ttm: Clear all DMA mappings on demand

[Andrey Grodzovsky <andrey.grodzovsky@amd.com>]

Used by drivers supporting hot unplug to handle all
DMA IOMMU group related dependencies before the group
is removed during device removal and we try to access
it after free when last device pointer from user space
is dropped.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
---
 drivers/gpu/drm/ttm/ttm_device.c | 45 ++++++++++++++++++++++++++++++++
 include/drm/ttm/ttm_device.h     |  1 +
 2 files changed, 46 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
index 5f31acec3ad7..ea50aba13743 100644
--- a/drivers/gpu/drm/ttm/ttm_device.c
+++ b/drivers/gpu/drm/ttm/ttm_device.c
@@ -245,3 +245,48 @@ void ttm_device_fini(struct ttm_device *bdev)
 	ttm_global_release();
 }
 EXPORT_SYMBOL(ttm_device_fini);
+
+void ttm_device_clear_dma_mappings(struct ttm_device *bdev)
+{
+	struct ttm_resource_manager *man;
+	struct ttm_buffer_object *bo;
+	unsigned int i, j;
+
+	spin_lock(&bdev->lru_lock);
+	for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) {
+		man = ttm_manager_type(bdev, i);
+		if (!man || !man->use_tt)
+			continue;
+
+		while (!list_empty(&man->pinned)) {
+			bo = list_first_entry(&man->pinned, struct ttm_buffer_object, lru);
+			/* Take ref against racing releases once lru_lock is unlocked */
+			ttm_bo_get(bo);
+			list_del_init(&bo->lru);
+			spin_unlock(&bdev->lru_lock);
+
+			if (bo->ttm)
+				ttm_tt_destroy_common(bo->bdev, bo->ttm);
+
+			ttm_bo_put(bo);
+			spin_lock(&bdev->lru_lock);
+		}
+
+		for (j = 0; j < TTM_MAX_BO_PRIORITY; ++j) {
+			while (!list_empty(&man->lru[j])) {
+				bo = list_first_entry(&man->lru[j], struct ttm_buffer_object, lru);
+				ttm_bo_get(bo);
+				list_del_init(&bo->lru);
+				spin_unlock(&bdev->lru_lock);
+
+				if (bo->ttm)
+					ttm_tt_destroy_common(bo->bdev, bo->ttm);
+
+				ttm_bo_put(bo);
+				spin_lock(&bdev->lru_lock);
+			}
+		}
+	}
+	spin_unlock(&bdev->lru_lock);
+}
+EXPORT_SYMBOL(ttm_device_clear_dma_mappings);
diff --git a/include/drm/ttm/ttm_device.h b/include/drm/ttm/ttm_device.h
index cd592f8e941b..d2837decb49a 100644
--- a/include/drm/ttm/ttm_device.h
+++ b/include/drm/ttm/ttm_device.h
@@ -298,5 +298,6 @@ int ttm_device_init(struct ttm_device *bdev, struct ttm_device_funcs *funcs,
 		    struct drm_vma_offset_manager *vma_manager,
 		    bool use_dma_alloc, bool use_dma32);
 void ttm_device_fini(struct ttm_device *bdev);
+void ttm_device_clear_dma_mappings(struct ttm_device *bdev);
 
 #endif
-- 
2.25.1