x86: mmiotrace - trace memory mapped IO

[karo-tx-linux.git] / include / linux / mmiotrace.h

diff --git a/include/linux/mmiotrace.h b/include/linux/mmiotrace.h
new file mode 100644 (file)
index 0000000..cb24782
--- /dev/null
+++ b/include/linux/mmiotrace.h
@@ -0,0 +1,62 @@
+#ifndef MMIOTRACE_H
+#define MMIOTRACE_H
+
+#include <asm/types.h>
+
+#define MMIO_VERSION 0x04
+
+/* mm_io_header.type */
+#define MMIO_OPCODE_MASK 0xff
+#define MMIO_OPCODE_SHIFT 0
+#define MMIO_WIDTH_MASK 0xff00
+#define MMIO_WIDTH_SHIFT 8
+#define MMIO_MAGIC (0x6f000000 | (MMIO_VERSION<<16))
+#define MMIO_MAGIC_MASK 0xffff0000
+
+enum mm_io_opcode {          /* payload type: */
+       MMIO_READ = 0x1,     /* struct mm_io_rw */
+       MMIO_WRITE = 0x2,    /* struct mm_io_rw */
+       MMIO_PROBE = 0x3,    /* struct mm_io_map */
+       MMIO_UNPROBE = 0x4,  /* struct mm_io_map */
+       MMIO_MARKER = 0x5,   /* raw char data */
+       MMIO_UNKNOWN_OP = 0x6, /* struct mm_io_rw */
+};
+
+struct mm_io_header {
+       __u32 type;
+       __u32 sec;      /* timestamp */
+       __u32 nsec;
+       __u32 pid;      /* PID of the process, or 0 for kernel core */
+       __u16 data_len; /* length of the following payload */
+};
+
+struct mm_io_rw {
+       __u64 address; /* virtual address of register */
+       __u64 value;
+       __u64 pc;      /* optional program counter */
+};
+
+struct mm_io_map {
+       __u64 phys;  /* base address in PCI space */
+       __u64 addr;  /* base virtual address */
+       __u64 len;   /* mapping size */
+       __u64 pc;    /* optional program counter */
+};
+
+
+/*
+ * These structures are used to allow a single relay_write()
+ * call to write a full packet.
+ */
+
+struct mm_io_header_rw {
+       struct mm_io_header header;
+       struct mm_io_rw rw;
+} __attribute__((packed));
+
+struct mm_io_header_map {
+       struct mm_io_header header;
+       struct mm_io_map map;
+} __attribute__((packed));
+
+#endif /* MMIOTRACE_H */