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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /drivers/dma-buf/heaps/heap-helpers.h
parentInitial commit. (diff)
downloadlinux-upstream.tar.xz
linux-upstream.zip
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/dma-buf/heaps/heap-helpers.h')
-rw-r--r--drivers/dma-buf/heaps/heap-helpers.h53
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/dma-buf/heaps/heap-helpers.h b/drivers/dma-buf/heaps/heap-helpers.h
new file mode 100644
index 000000000..805d2df88
--- /dev/null
+++ b/drivers/dma-buf/heaps/heap-helpers.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * DMABUF Heaps helper code
+ *
+ * Copyright (C) 2011 Google, Inc.
+ * Copyright (C) 2019 Linaro Ltd.
+ */
+
+#ifndef _HEAP_HELPERS_H
+#define _HEAP_HELPERS_H
+
+#include <linux/dma-heap.h>
+#include <linux/list.h>
+
+/**
+ * struct heap_helper_buffer - helper buffer metadata
+ * @heap: back pointer to the heap the buffer came from
+ * @dmabuf: backing dma-buf for this buffer
+ * @size: size of the buffer
+ * @priv_virt pointer to heap specific private value
+ * @lock mutext to protect the data in this structure
+ * @vmap_cnt count of vmap references on the buffer
+ * @vaddr vmap'ed virtual address
+ * @pagecount number of pages in the buffer
+ * @pages list of page pointers
+ * @attachments list of device attachments
+ *
+ * @free heap callback to free the buffer
+ */
+struct heap_helper_buffer {
+ struct dma_heap *heap;
+ struct dma_buf *dmabuf;
+ size_t size;
+
+ void *priv_virt;
+ struct mutex lock;
+ int vmap_cnt;
+ void *vaddr;
+ pgoff_t pagecount;
+ struct page **pages;
+ struct list_head attachments;
+
+ void (*free)(struct heap_helper_buffer *buffer);
+};
+
+void init_heap_helper_buffer(struct heap_helper_buffer *buffer,
+ void (*free)(struct heap_helper_buffer *));
+
+struct dma_buf *heap_helper_export_dmabuf(struct heap_helper_buffer *buffer,
+ int fd_flags);
+
+extern const struct dma_buf_ops heap_helper_ops;
+#endif /* _HEAP_HELPERS_H */