+/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2014 Google, Inc.
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __IOTRACE_H
#define __IOTRACE_H
+//#include <common.h>
#include <linux/types.h>
+/* Support up to the machine word length for now */
+typedef ulong iovalue_t;
+
+enum iotrace_flags {
+ IOT_8 = 0,
+ IOT_16,
+ IOT_32,
+
+ IOT_READ = 0 << 3,
+ IOT_WRITE = 1 << 3,
+};
+
+/**
+ * struct iotrace_record - Holds a single I/O trace record
+ *
+ * @flags: I/O access type
+ * @timestamp: Timestamp of access
+ * @addr: Address of access
+ * @value: Value written or read
+ */
+struct iotrace_record {
+ enum iotrace_flags flags;
+ u64 timestamp;
+ phys_addr_t addr;
+ iovalue_t value;
+};
+
/*
* This file is designed to be included in arch/<arch>/include/asm/io.h.
* It redirects all IO access through a tracing/checksumming feature for
u32 iotrace_get_checksum(void);
/**
+ * iotrace_set_region() - Set whether iotrace is limited to a specific
+ * io region.
+ *
+ * Defines the address and size of the limited region.
+ *
+ * @start: address of the beginning of the region
+ * @size: size of the region in bytes.
+ */
+void iotrace_set_region(ulong start, ulong size);
+
+/**
+ * iotrace_reset_region() - Reset the region limit
+ */
+void iotrace_reset_region(void);
+
+/**
+ * iotrace_get_region() - Get region information
+ *
+ * @start: Returns start address of region
+ * @size: Returns size of region in bytes
+ */
+void iotrace_get_region(ulong *start, ulong *size);
+
+/**
* iotrace_set_enabled() - Set whether iotracing is enabled or not
*
* This controls whether the checksum is updated and a trace record added
* iotrace_get_buffer() - Get buffer information
*
* @start: Returns start address of buffer
- * @size: Returns size of buffer in bytes
+ * @size: Returns actual size of buffer in bytes
+ * @needed_size: Returns needed size of buffer in bytes
* @offset: Returns the byte offset where the next output trace record will
* @count: Returns the number of trace records recorded
* be written (or would be if the buffer was large enough)
*/
-void iotrace_get_buffer(ulong *start, ulong *size, ulong *offset, ulong *count);
+void iotrace_get_buffer(ulong *start, ulong *size, ulong *needed_size, ulong *offset, ulong *count);
#endif /* __IOTRACE_H */