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v3d: Make sure we don't emit a thrsw before the last one finished.

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Found while forcing some spilling, which creates a lot of short
tmua->thrsw->ldtmu sequences.

Cc: "18.2" <mesa-stable@lists.freedesktop.org>
This commit is contained in:
Eric Anholt 2018-08-01 16:37:08 -07:00
parent f9d54dc3cf
commit ccbe33af5b
1 changed files with 13 additions and 2 deletions
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15
src/broadcom/compiler/qpu_schedule.c
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@ -462,6 +462,7 @@ struct choose_scoreboard {
int last_magic_sfu_write_tick;
int last_ldvary_tick;
int last_uniforms_reset_tick;
int last_thrsw_tick;
bool tlb_locked;
};
@ -1095,10 +1096,16 @@ qpu_instruction_valid_in_thrend_slot(struct v3d_compile *c,
}
static bool
valid_thrsw_sequence(struct v3d_compile *c,
valid_thrsw_sequence(struct v3d_compile *c, struct choose_scoreboard *scoreboard,
struct qinst *qinst, int instructions_in_sequence,
bool is_thrend)
{
/* No emitting our thrsw while the previous thrsw hasn't happened yet. */
if (scoreboard->last_thrsw_tick + 3 >
scoreboard->tick - instructions_in_sequence) {
return false;
}
for (int slot = 0; slot < instructions_in_sequence; slot++) {
/* No scheduling SFU when the result would land in the other
* thread. The simulator complains for safety, though it
@ -1159,7 +1166,8 @@ emit_thrsw(struct v3d_compile *c,
if (!v3d_qpu_sig_pack(c->devinfo, &sig, &packed_sig))
break;
if (!valid_thrsw_sequence(c, prev_inst, slots_filled + 1,
if (!valid_thrsw_sequence(c, scoreboard,
prev_inst, slots_filled + 1,
is_thrend)) {
break;
}
@ -1173,7 +1181,9 @@ emit_thrsw(struct v3d_compile *c,
if (merge_inst) {
merge_inst->qpu.sig.thrsw = true;
needs_free = true;
scoreboard->last_thrsw_tick = scoreboard->tick - slots_filled;
} else {
scoreboard->last_thrsw_tick = scoreboard->tick;
insert_scheduled_instruction(c, block, scoreboard, inst);
time++;
slots_filled++;
@ -1475,6 +1485,7 @@ v3d_qpu_schedule_instructions(struct v3d_compile *c)
scoreboard.last_ldvary_tick = -10;
scoreboard.last_magic_sfu_write_tick = -10;
scoreboard.last_uniforms_reset_tick = -10;
scoreboard.last_thrsw_tick = -10;
if (debug) {
fprintf(stderr, "Pre-schedule instructions\n");