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:

// 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)