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authorNaushir Patuck <naush@raspberrypi.com>2020-07-15 10:39:10 +0100
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2020-07-17 16:36:27 +0300
commit3c02a808e8934a0c2d875d5585403ce0a09d7c93 (patch)
treebdec824911523b6f01110e2d01cf80e8995419c3 /include/linux/dma-heap.h
parentc3548a333f86d31213ca9f2ccc3faf743b246743 (diff)
include: linux: Add dma-buf.h and dma-heap.h UAPI headers
This commit adds the dmabuf UAPI headers from the mainline Linux kernel v5.6.19. They are required by the Raspberry Pi library for lens shading table allocations. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'include/linux/dma-heap.h')
-rw-r--r--include/linux/dma-heap.h53
1 files changed, 53 insertions, 0 deletions
diff --git a/include/linux/dma-heap.h b/include/linux/dma-heap.h
new file mode 100644
index 00000000..6f84fa08
--- /dev/null
+++ b/include/linux/dma-heap.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * DMABUF Heaps Userspace API
+ *
+ * Copyright (C) 2011 Google, Inc.
+ * Copyright (C) 2019 Linaro Ltd.
+ */
+#ifndef _UAPI_LINUX_DMABUF_POOL_H
+#define _UAPI_LINUX_DMABUF_POOL_H
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+/**
+ * DOC: DMABUF Heaps Userspace API
+ */
+
+/* Valid FD_FLAGS are O_CLOEXEC, O_RDONLY, O_WRONLY, O_RDWR */
+#define DMA_HEAP_VALID_FD_FLAGS (O_CLOEXEC | O_ACCMODE)
+
+/* Currently no heap flags */
+#define DMA_HEAP_VALID_HEAP_FLAGS (0)
+
+/**
+ * struct dma_heap_allocation_data - metadata passed from userspace for
+ * allocations
+ * @len: size of the allocation
+ * @fd: will be populated with a fd which provides the
+ * handle to the allocated dma-buf
+ * @fd_flags: file descriptor flags used when allocating
+ * @heap_flags: flags passed to heap
+ *
+ * Provided by userspace as an argument to the ioctl
+ */
+struct dma_heap_allocation_data {
+ __u64 len;
+ __u32 fd;
+ __u32 fd_flags;
+ __u64 heap_flags;
+};
+
+#define DMA_HEAP_IOC_MAGIC 'H'
+
+/**
+ * DOC: DMA_HEAP_IOCTL_ALLOC - allocate memory from pool
+ *
+ * Takes a dma_heap_allocation_data struct and returns it with the fd field
+ * populated with the dmabuf handle of the allocation.
+ */
+#define DMA_HEAP_IOCTL_ALLOC _IOWR(DMA_HEAP_IOC_MAGIC, 0x0,\
+ struct dma_heap_allocation_data)
+
+#endif /* _UAPI_LINUX_DMABUF_POOL_H */