Mesa (master): i965: Add 'wait' instruction support

[Eric Anholt]

Module: Mesa
Branch: master
Commit: 20be3ff57670529a410b30a1008a71e768d08428
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=20be3ff57670529a410b30a1008a71e768d08428

Author: Zhenyu Wang <zhenyuw at linux.intel.com>
Date:   Fri Jun 25 16:05:24 2010 +0800

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 <zhenyuw at linux.intel.com>

---

 src/mesa/drivers/dri/i965/brw_eu.h      |   16 ++++++++++++++++
 src/mesa/drivers/dri/i965/brw_eu_emit.c |   14 ++++++++++++++
 2 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_eu.h b/src/mesa/drivers/dri/i965/brw_eu.h
index a6fcd83..3a01000 100644
--- a/src/mesa/drivers/dri/i965/brw_eu.h
+++ b/src/mesa/drivers/dri/i965/brw_eu.h
@@ -520,6 +520,20 @@ static INLINE struct brw_reg brw_acc_reg( void )
 		       0);
 }
 
+static INLINE struct brw_reg brw_notification_1_reg(void)
+{
+
+   return brw_reg(BRW_ARCHITECTURE_REGISTER_FILE,
+		  BRW_ARF_NOTIFICATION_COUNT,
+		  1,
+		  BRW_REGISTER_TYPE_UD,
+		  BRW_VERTICAL_STRIDE_0,
+		  BRW_WIDTH_1,
+		  BRW_HORIZONTAL_STRIDE_0,
+		  BRW_SWIZZLE_XXXX,
+		  WRITEMASK_X);
+}
+
 
 static INLINE struct brw_reg brw_flag_reg( void )
 {
@@ -919,6 +933,8 @@ void brw_land_fwd_jump(struct brw_compile *p,
 
 void brw_NOP(struct brw_compile *p);
 
+void brw_WAIT(struct brw_compile *p);
+
 /* Special case: there is never a destination, execution size will be
  * taken from src0:
  */
diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 34dfe10..10e9ebc 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;
+}
 
 
 /***********************************************************************