From 20be3ff57670529a410b30a1008a71e768d08428 Mon Sep 17 00:00:00 2001 From: Zhenyu Wang Date: Fri, 25 Jun 2010 16:05:24 +0800 Subject: i965: Add 'wait' instruction support When EU executes 'wait' instruction, it stalls and sets notification register state. Host can issue MMIO write to clear notification register state to allow EU continue on executing again. Signed-off-by: Zhenyu Wang --- src/mesa/drivers/dri/i965/brw_eu_emit.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'src/mesa/drivers/dri/i965/brw_eu_emit.c') diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c index 34dfe10cb9..10e9ebc3b0 100644 --- a/src/mesa/drivers/dri/i965/brw_eu_emit.c +++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c @@ -906,6 +906,20 @@ void brw_CMP(struct brw_compile *p, } } +/* Issue 'wait' instruction for n1, host could program MMIO + to wake up thread. */ +void brw_WAIT (struct brw_compile *p) +{ + struct brw_instruction *insn = next_insn(p, BRW_OPCODE_WAIT); + struct brw_reg src = brw_notification_1_reg(); + + brw_set_dest(insn, src); + brw_set_src0(insn, src); + brw_set_src1(insn, brw_null_reg()); + insn->header.execution_size = 0; /* must */ + insn->header.predicate_control = 0; + insn->header.compression_control = 0; +} /*********************************************************************** -- cgit v1.2.3