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i965: Add 'wait' instruction support

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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>
This commit is contained in:
Zhenyu Wang 2010-06-25 16:05:24 +08:00 • committed by Eric Anholt
parent a3cc7585ea
commit 20be3ff576
2 changed files with 30 additions and 0 deletions
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16
src/mesa/drivers/dri/i965/brw_eu.h
View file

@ -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:
*/

14
src/mesa/drivers/dri/i965/brw_eu_emit.c
View file

@ -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;
}
/***********************************************************************