1 files changed, 110 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
new file mode 100644
index 000000000..265f7c48d
--- /dev/null
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/**************************************************************************
+ *
+ * Copyright 2009-2011 VMware, Inc., Palo Alto, CA., USA
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include "vmwgfx_drv.h"
+
+static int vmw_bo_vm_lookup(struct ttm_device *bdev,
+				   struct drm_file *filp,
+				   unsigned long offset,
+				   unsigned long pages,
+				   struct ttm_buffer_object **p_bo)
+{
+	struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
+	struct drm_device *drm = &dev_priv->drm;
+	struct drm_vma_offset_node *node;
+	int ret;
+
+	*p_bo = NULL;
+
+	drm_vma_offset_lock_lookup(bdev->vma_manager);
+
+	node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, pages);
+	if (likely(node)) {
+		*p_bo = container_of(node, struct ttm_buffer_object,
+				  base.vma_node);
+		*p_bo = ttm_bo_get_unless_zero(*p_bo);
+	}
+
+	drm_vma_offset_unlock_lookup(bdev->vma_manager);
+
+	if (!*p_bo) {
+		drm_err(drm, "Could not find buffer object to map\n");
+		return -EINVAL;
+	}
+
+	if (!drm_vma_node_is_allowed(node, filp)) {
+		ret = -EACCES;
+		goto out_no_access;
+	}
+
+	return 0;
+out_no_access:
+	ttm_bo_put(*p_bo);
+	return ret;
+}
+
+int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	static const struct vm_operations_struct vmw_vm_ops = {
+		.pfn_mkwrite = vmw_bo_vm_mkwrite,
+		.page_mkwrite = vmw_bo_vm_mkwrite,
+		.fault = vmw_bo_vm_fault,
+		.open = ttm_bo_vm_open,
+		.close = ttm_bo_vm_close,
+	};
+	struct drm_file *file_priv = filp->private_data;
+	struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);
+	struct ttm_device *bdev = &dev_priv->bdev;
+	struct ttm_buffer_object *bo;
+	int ret;
+
+	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET_START))
+		return -EINVAL;
+
+	ret = vmw_bo_vm_lookup(bdev, file_priv, vma->vm_pgoff, vma_pages(vma), &bo);
+	if (unlikely(ret != 0))
+		return ret;
+
+	ret = ttm_bo_mmap_obj(vma, bo);
+	if (unlikely(ret != 0))
+		goto out_unref;
+
+	vma->vm_ops = &vmw_vm_ops;
+
+	/* Use VM_PFNMAP rather than VM_MIXEDMAP if not a COW mapping */
+	if (!is_cow_mapping(vma->vm_flags))
+		vma->vm_flags = (vma->vm_flags & ~VM_MIXEDMAP) | VM_PFNMAP;
+
+	ttm_bo_put(bo); /* release extra ref taken by ttm_bo_mmap_obj() */
+
+	return 0;
+
+out_unref:
+	ttm_bo_put(bo);
+	return ret;
+}
+