Hello,
Sorry for late response. I was on vacation.
I am glad that this fix is ok.
Thanks a lot for your review.
Regards,
Andrii.
On 2018-06-25 12:11 PM, Iago Toral wrote:
Thanks for testing Mark.
Andrii, I'll add my Reviewed-by and and push the patch to master later
today (I'll also queue it for the next stable release).
Thanks for fixing this!
Iago
On Fri, 2018-06-22 at 13:18 -0700, Mark Janes wrote:
Tested-by: Mark Janes
Iago Toral writes:
Thanks Andrii, this version looks good to me.
Mark: this change fixes a GPU hang in sandy bridge with geometry
shaders (the change itself affects a path in the driver that is
only
executed in SNB with GS, so nothing else is affected). While I
think
the change in here is correct according to the PRMs and in fact it
seems to fix the GPU hang reported in Bugzilla, since this is
tinkering
with the way in which we allocate and free VUEs for SNB GS I
believe
that if this breaks anything it might produce a GPU hang and in
that
case I would rather not hang Jenkins for everyone else until you
have a
chance to restore it, so in order to minimize that risk, could you
run
this through Jenkins when you are available? If that is
inconvenient
for you just let me know and I will send it myself late in my day
on
Monday to minimize the risk.
Thanks,
Iago
On Fri, 2018-06-22 at 10:59 +0300, Andrii Simiklit wrote:
We can not use the VUE Dereference flags combination for EOT
message under ILK and SNB because the threads are not initialized
there with initial VUE handle unlike Pre-IL.
So to avoid GPU hangs on SNB and ILK we need
to avoid usage of the VUE Dereference flags combination.
(Was tested only on SNB but according to the specification
SNB Volume 2 Part 1: 1.6.5.3, 1.6.5.6
the ILK must behave itself in the similar way)
v2: Approach to fix this issue was changed.
Instead of different EOT flags in the program end
we will create VUE every time even if GS produces no output.
v3: Clean up the patch.
Signed-off-by: Andrii Simiklit
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105399
---
src/intel/compiler/gen6_gs_visitor.cpp | 42 +---
--
1 file changed, 21 insertions(+), 21 deletions(-)
diff --git a/src/intel/compiler/gen6_gs_visitor.cpp
b/src/intel/compiler/gen6_gs_visitor.cpp
index 66c69fb..c9571cc 100644
--- a/src/intel/compiler/gen6_gs_visitor.cpp
+++ b/src/intel/compiler/gen6_gs_visitor.cpp
@@ -350,27 +350,27 @@ gen6_gs_visitor::emit_thread_end()
int max_usable_mrf = FIRST_SPILL_MRF(devinfo->gen);
/* Issue the FF_SYNC message and obtain the initial VUE
handle.
*/
+ this->current_annotation = "gen6 thread end: ff_sync";
+
+ vec4_instruction *inst = NULL;
+ if (prog->info.has_transform_feedback_varyings) {
+ src_reg sol_temp(this, glsl_type::uvec4_type);
+ emit(GS_OPCODE_FF_SYNC_SET_PRIMITIVES,
+ dst_reg(this->svbi),
+ this->vertex_count,
+ this->prim_count,
+ sol_temp);
+ inst = emit(GS_OPCODE_FF_SYNC,
+ dst_reg(this->temp), this->prim_count, this-
svbi);
+ } else {
+ inst = emit(GS_OPCODE_FF_SYNC,
+ dst_reg(this->temp), this->prim_count,
brw_imm_ud(0u));
+ }
+ inst->base_mrf = base_mrf;
+
emit(CMP(dst_null_ud(), this->vertex_count, brw_imm_ud(0u),
BRW_CONDITIONAL_G));
emit(IF(BRW_PREDICATE_NORMAL));
{
- this->current_annotation = "gen6 thread end: ff_sync";
-
- vec4_instruction *inst;
- if (prog->info.has_transform_feedback_varyings) {
- src_reg sol_temp(this, glsl_type::uvec4_type);
- emit(GS_OPCODE_FF_SYNC_SET_PRIMITIVES,
- dst_reg(this->svbi),
- this->vertex_count,
- this->prim_count,
- sol_temp);
- inst = emit(GS_OPCODE_FF_SYNC,
- dst_reg(this->temp), this->prim_count,
this-
svbi);
- } else {
- inst = emit(GS_OPCODE_FF_SYNC,
- dst_reg(this->temp), this->prim_count,
brw_imm_ud(0u));
- }
- inst->base_mrf = base_mrf;
-
/* Loop over all buffered vertices and emit URB write
messages
*/
this->current_annotation = "gen6 thread end: urb writes
init";
src_reg vertex(this, glsl_type::uint_type);
@@ -414,7 +414,7 @@ gen6_gs_visitor::emit_thread_end()
dst_reg reg = dst_reg(MRF, mrf);
reg.type = output_reg[varying][0].type;
data.type = reg.type;
- vec4_instruction *inst = emit(MOV(reg, data));
+ inst = emit(MOV(reg, data));
inst->force_writemask_all = true;
mrf++;
@@ -460,7 +460,7 @@ gen6_gs_visitor::emit_thread_end()
*
* However, this would lead us to end the program with an
ENDIF
opcode,
* which we want to avoid, so what we do is that we always
request a new
-* VUE handle every time we do a URB WRITE, even for the last
vertex we emit.
+* VUE handle every time, even if GS
