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@linux.intel.com>

diff --git a/src/mesa/drivers/dri/i965/brw_eu.h b/src/mesa/drivers/dri/i965/brw_eu.h
index a6fcd832f7daf9600b2b8bfe3085852287086e11..3a0100024cf750135e26556d6abe43f7e106e0db 100644 (file)
--- 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 34dfe10cb930f429a280ed4b8b0c7868bccbc3ef..10e9ebc3b0ecddaaec24717ba107bc0b6071d4c9 100644 (file)
--- 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;
+}
 
 
 /***********************************************************************