include/linux/dma-heap.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * DMABUF Heaps Allocation Infrastructure
   4  *
   5  * Copyright (C) 2011 Google, Inc.
   6  * Copyright (C) 2019 Linaro Ltd.
   7  */
   8
   9 #ifndef _DMA_HEAPS_H
  10 #define _DMA_HEAPS_H
  11
  12 #include <linux/cdev.h>
  13 #include <linux/types.h>
  14
  15 struct dma_heap;
  16
  17 /**
  18  * struct dma_heap_ops - ops to operate on a given heap
  19  * @allocate:           allocate dmabuf and return fd
  20  *
  21  * allocate returns dmabuf fd  on success, -errno on error.
  22  */
  23 struct dma_heap_ops {
  24         int (*allocate)(struct dma_heap *heap,
  25                         unsigned long len,
  26                         unsigned long fd_flags,
  27                         unsigned long heap_flags);
  28 };
  29
  30 /**
  31  * struct dma_heap_export_info - information needed to export a new dmabuf heap
  32  * @name:       used for debugging/device-node name
  33  * @ops:        ops struct for this heap
  34  * @priv:       heap exporter private data
  35  *
  36  * Information needed to export a new dmabuf heap.
  37  */
  38 struct dma_heap_export_info {
  39         const char *name;
  40         const struct dma_heap_ops *ops;
  41         void *priv;
  42 };
  43
  44 /**
  45  * dma_heap_get_drvdata() - get per-heap driver data
  46  * @heap: DMA-Heap to retrieve private data for
  47  *
  48  * Returns:
  49  * The per-heap data for the heap.
  50  */
  51 void *dma_heap_get_drvdata(struct dma_heap *heap);
  52
  53 /**
  54  * dma_heap_add - adds a heap to dmabuf heaps
  55  * @exp_info:           information needed to register this heap
  56  */
  57 struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info);
  58
  59 #endif /* _DMA_HEAPS_H */