1 files changed, 99 insertions, 0 deletions
diff --git a/include/uapi/linux/alloc_tag.h b/include/uapi/linux/alloc_tag.h
new file mode 100644
index 000000000000..e3ad94444864
--- /dev/null
+++ b/include/uapi/linux/alloc_tag.h
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * alloc_tag IOCTL API definition
+ *
+ * Copyright (C) 2026 Google, LLC.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _UAPI_ALLOC_TAG_H
+#define _UAPI_ALLOC_TAG_H
+
+#include <linux/types.h>
+
+/*
+ * Function, file and module names often have the same prefixes, therefore
+ * when filtering by these criteria, we compare the last 64 characters to
+ * minimize the chances of name collisions
+ */
+#define ALLOCINFO_STR_SIZE	64
+
+struct allocinfo_content_id {
+	__u64 id;
+};
+
+struct allocinfo_tag {
+	/* Longer names are trimmed */
+	char modname[ALLOCINFO_STR_SIZE];
+	char function[ALLOCINFO_STR_SIZE];
+	char filename[ALLOCINFO_STR_SIZE];
+	__u64 lineno;
+};
+
+/* The alignment ensures 32-bit compatible interfaces are not broken */
+struct allocinfo_counter {
+	__u64 bytes;
+	__u64 calls;
+	__u8 accurate;
+} __attribute__((aligned(8)));
+
+struct allocinfo_tag_data {
+	struct allocinfo_tag tag;
+	struct allocinfo_counter counter;
+};
+
+enum {
+	ALLOCINFO_FILTER_MODNAME,
+	ALLOCINFO_FILTER_FUNCTION,
+	ALLOCINFO_FILTER_FILENAME,
+	ALLOCINFO_FILTER_LINENO,
+	ALLOCINFO_FILTER_INACCURATE,
+	ALLOCINFO_FILTER_MIN_SIZE,
+	ALLOCINFO_FILTER_MAX_SIZE,
+	__ALLOCINFO_FILTER_LAST = ALLOCINFO_FILTER_MAX_SIZE
+};
+
+#define ALLOCINFO_FILTER_MASK_MODNAME		(1 << ALLOCINFO_FILTER_MODNAME)
+#define ALLOCINFO_FILTER_MASK_FUNCTION		(1 << ALLOCINFO_FILTER_FUNCTION)
+#define ALLOCINFO_FILTER_MASK_FILENAME		(1 << ALLOCINFO_FILTER_FILENAME)
+#define ALLOCINFO_FILTER_MASK_LINENO		(1 << ALLOCINFO_FILTER_LINENO)
+#define ALLOCINFO_FILTER_MASK_INACCURATE	(1 << ALLOCINFO_FILTER_INACCURATE)
+#define ALLOCINFO_FILTER_MASK_MIN_SIZE		(1 << ALLOCINFO_FILTER_MIN_SIZE)
+#define ALLOCINFO_FILTER_MASK_MAX_SIZE		(1 << ALLOCINFO_FILTER_MAX_SIZE)
+
+#define ALLOCINFO_FILTER_MASKS \
+	((1 << (__ALLOCINFO_FILTER_LAST + 1)) - 1)
+
+struct allocinfo_filter {
+	__u64 mask; /* bitmask of the filter fields used */
+	struct allocinfo_tag fields;
+	__u64 min_size;
+	__u64 max_size;
+	/* filter criteria only; see allocinfo_counter.accurate for actual accuracy */
+	__u64 inaccurate;
+};
+
+struct allocinfo_get_at {
+	/* inputs */
+	__u64 pos;
+	struct allocinfo_filter filter;
+	/* output */
+	struct allocinfo_tag_data data;
+};
+
+#define _ALLOCINFO_IOC_CONTENT_ID	0
+#define _ALLOCINFO_IOC_GET_AT		1
+#define _ALLOCINFO_IOC_GET_NEXT		2
+
+#define ALLOCINFO_IOC_BASE		0xA6
+#define ALLOCINFO_IOC_CONTENT_ID	_IOR(ALLOCINFO_IOC_BASE, _ALLOCINFO_IOC_CONTENT_ID,	\
+					     struct allocinfo_content_id)
+#define ALLOCINFO_IOC_GET_AT		_IOWR(ALLOCINFO_IOC_BASE, _ALLOCINFO_IOC_GET_AT,	\
+					      struct allocinfo_get_at)
+#define ALLOCINFO_IOC_GET_NEXT		_IOR(ALLOCINFO_IOC_BASE, _ALLOCINFO_IOC_GET_NEXT,	\
+					     struct allocinfo_tag_data)
+
+#endif /* _UAPI_ALLOC_TAG_H */