12 #include <linux/dma-buf-cache.h>
13 #include <linux/dma-iommu.h>
14 #include <linux/dma-mapping.h>
23 #include <asm/dma-iommu.h>
32 mpp_dma_find_buffer_fd(struct mpp_dma_session *dma, int fd)  in mpp_dma_find_buffer_fd()  argument
42 	mutex_lock(&dma->list_mutex);  in mpp_dma_find_buffer_fd()
44 				 &dma->used_list, link) {  in mpp_dma_find_buffer_fd()
54 	mutex_unlock(&dma->list_mutex);  in mpp_dma_find_buffer_fd()
66 	buffer->dma->buffer_count--;  in mpp_dma_release_buffer()
67 	list_move_tail(&buffer->link, &buffer->dma->unused_list);  in mpp_dma_release_buffer()
72 	buffer->dma = NULL;  in mpp_dma_release_buffer()
85 mpp_dma_remove_extra_buffer(struct mpp_dma_session *dma)  in mpp_dma_remove_extra_buffer()  argument
91 	if (dma->buffer_count > dma->max_buffers) {  in mpp_dma_remove_extra_buffer()
92 		mutex_lock(&dma->list_mutex);  in mpp_dma_remove_extra_buffer()
94 					 &dma->used_list,  in mpp_dma_remove_extra_buffer()
104 		mutex_unlock(&dma->list_mutex);  in mpp_dma_remove_extra_buffer()
110 int mpp_dma_release(struct mpp_dma_session *dma,  in mpp_dma_release()  argument
113 	mutex_lock(&dma->list_mutex);  in mpp_dma_release()
115 	mutex_unlock(&dma->list_mutex);  in mpp_dma_release()
120 int mpp_dma_release_fd(struct mpp_dma_session *dma, int fd)  in mpp_dma_release_fd()  argument
122 	struct device *dev = dma->dev;  in mpp_dma_release_fd()
125 	buffer = mpp_dma_find_buffer_fd(dma, fd);  in mpp_dma_release_fd()
132 	mutex_lock(&dma->list_mutex);  in mpp_dma_release_fd()
134 	mutex_unlock(&dma->list_mutex);  in mpp_dma_release_fd()
179 					 struct mpp_dma_session *dma,  in mpp_dma_import_fd()  argument
188 	if (!dma) {  in mpp_dma_import_fd()
189 		mpp_err("dma session is null\n");  in mpp_dma_import_fd()
195 		mpp_dma_remove_extra_buffer(dma);  in mpp_dma_import_fd()
197 	/* Check whether in dma session */  in mpp_dma_import_fd()
198 	buffer = mpp_dma_find_buffer_fd(dma, fd);  in mpp_dma_import_fd()
204 		dev_dbg(dma->dev, "missing the fd %d\n", fd);  in mpp_dma_import_fd()
213 	/* A new DMA buffer */  in mpp_dma_import_fd()
214 	mutex_lock(&dma->list_mutex);  in mpp_dma_import_fd()
215 	buffer = list_first_entry_or_null(&dma->unused_list,  in mpp_dma_import_fd()
220 		mutex_unlock(&dma->list_mutex);  in mpp_dma_import_fd()
224 	mutex_unlock(&dma->list_mutex);  in mpp_dma_import_fd()
230 	attach = dma_buf_attach(buffer->dmabuf, dma->dev);  in mpp_dma_import_fd()
247 	buffer->dma = dma;  in mpp_dma_import_fd()
255 	mutex_lock(&dma->list_mutex);  in mpp_dma_import_fd()
256 	dma->buffer_count++;  in mpp_dma_import_fd()
257 	list_add_tail(&buffer->link, &dma->used_list);  in mpp_dma_import_fd()
258 	mutex_unlock(&dma->list_mutex);  in mpp_dma_import_fd()
265 	mutex_lock(&dma->list_mutex);  in mpp_dma_import_fd()
266 	list_add_tail(&buffer->link, &dma->unused_list);  in mpp_dma_import_fd()
267 	mutex_unlock(&dma->list_mutex);  in mpp_dma_import_fd()
273 int mpp_dma_unmap_kernel(struct mpp_dma_session *dma,  in mpp_dma_unmap_kernel()  argument
291 int mpp_dma_map_kernel(struct mpp_dma_session *dma,  in mpp_dma_map_kernel()  argument
303 		dev_dbg(dma->dev, "can't access the dma buffer\n");  in mpp_dma_map_kernel()
309 		dev_dbg(dma->dev, "can't vmap the dma buffer\n");  in mpp_dma_map_kernel()
325 int mpp_dma_session_destroy(struct mpp_dma_session *dma)  in mpp_dma_session_destroy()  argument
329 	if (!dma)  in mpp_dma_session_destroy()
332 	mutex_lock(&dma->list_mutex);  in mpp_dma_session_destroy()
334 				 &dma->used_list,  in mpp_dma_session_destroy()
338 	mutex_unlock(&dma->list_mutex);  in mpp_dma_session_destroy()
340 	kfree(dma);  in mpp_dma_session_destroy()
349 	struct mpp_dma_session *dma = NULL;  in mpp_dma_session_create()  local
352 	dma = kzalloc(sizeof(*dma), GFP_KERNEL);  in mpp_dma_session_create()
353 	if (!dma)  in mpp_dma_session_create()
356 	mutex_init(&dma->list_mutex);  in mpp_dma_session_create()
357 	INIT_LIST_HEAD(&dma->unused_list);  in mpp_dma_session_create()
358 	INIT_LIST_HEAD(&dma->used_list);  in mpp_dma_session_create()
363 		dma->max_buffers = MPP_SESSION_MAX_BUFFERS;  in mpp_dma_session_create()
365 		dma->max_buffers = max_buffers;  in mpp_dma_session_create()
368 	for (i = 0; i < ARRAY_SIZE(dma->dma_bufs); i++) {  in mpp_dma_session_create()
369 		buffer = &dma->dma_bufs[i];  in mpp_dma_session_create()
370 		buffer->dma = dma;  in mpp_dma_session_create()
372 		list_add_tail(&buffer->link, &dma->unused_list);  in mpp_dma_session_create()
374 	dma->dev = dev;  in mpp_dma_session_create()
376 	return dma;  in mpp_dma_session_create()
386 	struct device *dev = buffer->dma->dev;  in mpp_dma_buf_sync()