--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/llvm/docs/AMDGPU/gfx10_msg.rst	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,97 @@
+..
+    **************************************************
+    *                                                *
+    *   Automatically generated file, do not edit!   *
+    *                                                *
+    **************************************************
+
+.. _amdgpu_synid10_msg:
+
+msg
+===========================
+
+A 16-bit message code. The bits of this operand have the following meaning:
+
+    ============ =============================== ===============
+    Bits         Description                     Value Range
+    ============ =============================== ===============
+    3:0          Message *type*.                 0..15
+    6:4          Optional *operation*.           0..7
+    7:7          Unused.                         \-
+    9:8          Optional *stream*.              0..3
+    15:10        Unused.                         \-
+    ============ =============================== ===============
+
+This operand may be specified as one of the following:
+
+* An :ref:`integer_number<amdgpu_synid_integer_number>` or an :ref:`absolute_expression<amdgpu_synid_absolute_expression>`. The value must be in the range 0..0xFFFF.
+* A *sendmsg* value described below.
+
+    ==================================== ====================================================
+    Sendmsg Value Syntax                 Description
+    ==================================== ====================================================
+    sendmsg(<*type*>)                    A message identified by its *type*.
+    sendmsg(<*type*>,<*op*>)             A message identified by its *type* and *operation*.
+    sendmsg(<*type*>,<*op*>,<*stream*>)  A message identified by its *type* and *operation*
+                                         with a stream *id*.
+    ==================================== ====================================================
+
+*Type* may be specified using message *name* or message *id*.
+
+*Op* may be specified using operation *name* or operation *id*.
+
+Stream *id* is an integer in the range 0..3.
+
+Numeric values may be specified as positive :ref:`integer numbers<amdgpu_synid_integer_number>`
+or :ref:`absolute expressions<amdgpu_synid_absolute_expression>`.
+
+Each message type supports specific operations:
+
+    ================= ========== ============================== ============ ==========
+    Message name      Message Id Supported Operations           Operation Id Stream Id
+    ================= ========== ============================== ============ ==========
+    MSG_INTERRUPT     1          \-                             \-           \-
+    MSG_GS            2          GS_OP_CUT                      1            Optional
+    \                            GS_OP_EMIT                     2            Optional
+    \                            GS_OP_EMIT_CUT                 3            Optional
+    MSG_GS_DONE       3          GS_OP_NOP                      0            \-
+    \                            GS_OP_CUT                      1            Optional
+    \                            GS_OP_EMIT                     2            Optional
+    \                            GS_OP_EMIT_CUT                 3            Optional
+    MSG_GS_ALLOC_REQ  9          \-                             \-           \-
+    MSG_GET_DOORBELL  10         \-                             \-           \-
+    MSG_SYSMSG        15         SYSMSG_OP_ECC_ERR_INTERRUPT    1            \-
+    \                            SYSMSG_OP_REG_RD               2            \-
+    \                            SYSMSG_OP_HOST_TRAP_ACK        3            \-
+    \                            SYSMSG_OP_TTRACE_PC            4            \-
+    ================= ========== ============================== ============ ==========
+
+*Sendmsg* arguments are validated depending on how *type* value is specified:
+
+* If message *type* is specified by name, arguments values must satisfy limitations detailed in the table above.
+* If message *type* is specified as a number, each argument must not exceed corresponding value range (see the first table).
+
+Examples:
+
+.. parsed-literal::
+
+    // numeric message code
+    msg = 0x10
+    s_sendmsg 0x12
+    s_sendmsg msg + 2
+
+    // sendmsg with strict arguments validation
+    s_sendmsg sendmsg(MSG_INTERRUPT)
+    s_sendmsg sendmsg(MSG_GS, GS_OP_EMIT)
+    s_sendmsg sendmsg(MSG_GS, 2)
+    s_sendmsg sendmsg(MSG_GS_DONE, GS_OP_EMIT_CUT, 1)
+    s_sendmsg sendmsg(MSG_SYSMSG, SYSMSG_OP_TTRACE_PC)
+    s_sendmsg sendmsg(MSG_GET_DOORBELL)
+
+    // sendmsg with validation of value range only
+    msg = 2
+    op = 3
+    stream = 1
+    s_sendmsg sendmsg(msg, op, stream)
+    s_sendmsg sendmsg(2, GS_OP_CUT)
+