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vc4: Add support for QPU scheduling of thread switch instructions.

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This is vaguely based off of Jonas Pfeil's thread switch support branch.
This commit is contained in:
Eric Anholt 2016-11-10 18:02:37 -08:00
parent 4f527f1260
commit 1ee503c74d
1 changed files with 27 additions and 2 deletions
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29
src/gallium/drivers/vc4/vc4_qpu_schedule.c
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@ -385,12 +385,27 @@ calculate_deps(struct schedule_state *state, struct schedule_node *n)
switch (sig) {
case QPU_SIG_SW_BREAKPOINT:
case QPU_SIG_NONE:
case QPU_SIG_THREAD_SWITCH:
case QPU_SIG_LAST_THREAD_SWITCH:
case QPU_SIG_SMALL_IMM:
case QPU_SIG_LOAD_IMM:
break;
case QPU_SIG_THREAD_SWITCH:
case QPU_SIG_LAST_THREAD_SWITCH:
/* All accumulator contents and flags are undefined after the
* switch.
*/
for (int i = 0; i < ARRAY_SIZE(state->last_r); i++)
add_write_dep(state, &state->last_r[i], n);
add_write_dep(state, &state->last_sf, n);
/* Scoreboard-locking operations have to stay after the last
* thread switch.
*/
add_write_dep(state, &state->last_tlb, n);
add_write_dep(state, &state->last_tmu_write, n);
break;
case QPU_SIG_LOAD_TMU0:
case QPU_SIG_LOAD_TMU1:
/* TMU loads are coming from a FIFO, so ordering is important.
@ -902,6 +917,16 @@ schedule_instructions(struct vc4_compile *c,
qpu_serialize_one_inst(c, inst);
qpu_serialize_one_inst(c, inst);
qpu_serialize_one_inst(c, inst);
} else if (QPU_GET_FIELD(inst, QPU_SIG) == QPU_SIG_THREAD_SWITCH ||
QPU_GET_FIELD(inst, QPU_SIG) == QPU_SIG_LAST_THREAD_SWITCH) {
/* The thread switch occurs after two delay slots. We
* should fit things in these slots, but we don't
* currently.
*/
inst = qpu_NOP();
update_scoreboard_for_chosen(scoreboard, inst);
qpu_serialize_one_inst(c, inst);
qpu_serialize_one_inst(c, inst);
}
}