1 files changed, 156 insertions, 0 deletions
diff --git a/include/iotrace.h b/include/iotrace.h
new file mode 100644
index 0000000..380da1f
--- /dev/null
+++ b/include/iotrace.h
@@ -0,0 +1,156 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2014 Google, Inc.
+ */
+
+#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
+ * testing purposes.
+ */
+
+#if defined(CONFIG_IO_TRACE) && !defined(IOTRACE_IMPL) && \
+	!defined(CONFIG_SPL_BUILD)
+
+#undef readl
+#define readl(addr)	iotrace_readl((const void *)(addr))
+
+#undef writel
+#define writel(val, addr)	iotrace_writel(val, (void *)(addr))
+
+#undef readw
+#define readw(addr)	iotrace_readw((const void *)(addr))
+
+#undef writew
+#define writew(val, addr)	iotrace_writew(val, (void *)(addr))
+
+#undef readb
+#define readb(addr)	iotrace_readb((const void *)(uintptr_t)addr)
+
+#undef writeb
+#define writeb(val, addr)	iotrace_writeb(val, (void *)(uintptr_t)addr)
+
+#endif
+
+/* Tracing functions which mirror their io.h counterparts */
+u32 iotrace_readl(const void *ptr);
+void iotrace_writel(ulong value, void *ptr);
+u16 iotrace_readw(const void *ptr);
+void iotrace_writew(ulong value, void *ptr);
+u8 iotrace_readb(const void *ptr);
+void iotrace_writeb(ulong value, void *ptr);
+
+/**
+ * iotrace_reset_checksum() - Reset the iotrace checksum
+ */
+void iotrace_reset_checksum(void);
+
+/**
+ * iotrace_get_checksum() - Get the current checksum value
+ *
+ * @return currect checksum value
+ */
+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
+ * for each I/O access.
+ *
+ * @enable: true to enable iotracing, false to disable
+ */
+void iotrace_set_enabled(int enable);
+
+/**
+ * iotrace_get_enabled() - Get whether iotracing is enabled or not
+ *
+ * @return true if enabled, false if disabled
+ */
+int iotrace_get_enabled(void);
+
+/**
+ * iotrace_set_buffer() - Set position and size of iotrace buffer
+ *
+ * Defines where the iotrace buffer goes, and resets the output pointer to
+ * the start of the buffer.
+ *
+ * The buffer can be 0 size in which case the checksum is updated but no
+ * trace records are writen. If the buffer is exhausted, the offset will
+ * continue to increase but not new data will be written.
+ *
+ * @start: Start address of buffer
+ * @size: Size of buffer in bytes
+ */
+void iotrace_set_buffer(ulong start, ulong size);
+
+/**
+ * iotrace_get_buffer() - Get buffer information
+ *
+ * @start: Returns start address of buffer
+ * @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 *needed_size, ulong *offset, ulong *count);
+
+#endif /* __IOTRACE_H */