12 #include <linux/dma-heap.h>
19 #include <uapi/linux/dma-heap.h>
26  * struct dma_heap - represents a dmabuf heap in the system
28  * @ops:		ops struct for this heap
29  * @priv:		private data for this heap
30  * @heap_devt:		heap device node
32  * @heap_cdev:		heap char device
34  * Represents a heap of memory from which buffers can be made.
51 static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,  in dma_heap_buffer_alloc()  argument
66 	dmabuf = heap->ops->allocate(heap, len, fd_flags, heap_flags);  in dma_heap_buffer_alloc()
80 	struct dma_heap *heap;  in dma_heap_open()  local
82 	heap = xa_load(&dma_heap_minors, iminor(inode));  in dma_heap_open()
83 	if (!heap) {  in dma_heap_open()
89 	file->private_data = heap;  in dma_heap_open()
98 	struct dma_heap *heap = file->private_data;  in dma_heap_ioctl_allocate()  local
110 	fd = dma_heap_buffer_alloc(heap, heap_allocation->len,  in dma_heap_ioctl_allocate()
195  * dma_heap_get_drvdata - get per-heap driver data
196  * @heap: DMA-Heap to retrieve private data for
199  * The per-heap data for the heap.
201 void *dma_heap_get_drvdata(struct dma_heap *heap)  in dma_heap_get_drvdata()  argument
203 	return heap->priv;  in dma_heap_get_drvdata()
207  * dma_heap_get_name - get heap name
208  * @heap: DMA-Heap to retrieve the name of
211  * The char* for the heap name.
213 const char *dma_heap_get_name(struct dma_heap *heap)  in dma_heap_get_name()  argument
215 	return heap->name;  in dma_heap_get_name()
219  * dma_heap_add - adds a heap to dmabuf heaps
220  * @exp_info: information needed to register this heap
224 	struct dma_heap *heap, *h, *err_ret;  in dma_heap_add()  local
230 		pr_err("dma_heap: Cannot add heap without a name\n");  in dma_heap_add()
235 		pr_err("dma_heap: Cannot add heap with invalid ops struct\n");  in dma_heap_add()
239 	heap = kzalloc(sizeof(*heap), GFP_KERNEL);  in dma_heap_add()
240 	if (!heap)  in dma_heap_add()
243 	heap->name = exp_info->name;  in dma_heap_add()
244 	heap->ops = exp_info->ops;  in dma_heap_add()
245 	heap->priv = exp_info->priv;  in dma_heap_add()
248 	ret = xa_alloc(&dma_heap_minors, &minor, heap,  in dma_heap_add()
251 		pr_err("dma_heap: Unable to get minor number for heap\n");  in dma_heap_add()
257 	heap->heap_devt = MKDEV(MAJOR(dma_heap_devt), minor);  in dma_heap_add()
259 	cdev_init(&heap->heap_cdev, &dma_heap_fops);  in dma_heap_add()
260 	ret = cdev_add(&heap->heap_cdev, heap->heap_devt, 1);  in dma_heap_add()
269 				heap->heap_devt,  in dma_heap_add()
271 				heap->name);  in dma_heap_add()
283 			pr_err("dma_heap: Already registered heap named %s\n",  in dma_heap_add()
290 	/* Add heap to the list */  in dma_heap_add()
291 	list_add(&heap->list, &heap_list);  in dma_heap_add()
294 	return heap;  in dma_heap_add()
297 	device_destroy(dma_heap_class, heap->heap_devt);  in dma_heap_add()
299 	cdev_del(&heap->heap_cdev);  in dma_heap_add()
303 	kfree(heap);  in dma_heap_add()