64 lines
2.1 KiB
Diff
64 lines
2.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Zhao Yan <yan.y.zhao@intel.com>
|
|
Date: Fri, 14 Sep 2018 16:10:20 +0800
|
|
Subject: [PATCH] drm/i915/gvt: add a fastpath for cmd parsing on MI_NOOP
|
|
|
|
MI_NOOP is a common command appearing in almost all command buffers, put it
|
|
into a fastpath can improve perfomance, especially in command buffers
|
|
contains lots of MI_NOOPs (0s).
|
|
|
|
Take glmark2 as an example, 3% performance increase is observed after
|
|
introduced this patch. Meanwhile, in case where abundant in MI_NOOPs,
|
|
up to 12% performance increase is measured.
|
|
|
|
v2: use lowercase for index of MI_NOOP in cmd_info (zhenyu wang)
|
|
|
|
Signed-off-by: Li Weinan <weinan.z.li@intel.com>
|
|
Signed-off-by: Zhao Yan <yan.y.zhao@intel.com>
|
|
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
|
|
Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
|
|
Reviewed-by: He, Min <min.he@intel.com>
|
|
---
|
|
drivers/gpu/drm/i915/gvt/cmd_parser.c | 11 ++++++++++-
|
|
1 file changed, 10 insertions(+), 1 deletion(-)
|
|
|
|
diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c
|
|
index 95244b2..8d130d4 100644
|
|
--- a/drivers/gpu/drm/i915/gvt/cmd_parser.c
|
|
+++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c
|
|
@@ -1840,6 +1840,8 @@ static int cmd_handler_mi_batch_buffer_start(struct parser_exec_state *s)
|
|
return ret;
|
|
}
|
|
|
|
+static int mi_noop_index;
|
|
+
|
|
static struct cmd_info cmd_info[] = {
|
|
{"MI_NOOP", OP_MI_NOOP, F_LEN_CONST, R_ALL, D_ALL, 0, 1, NULL},
|
|
|
|
@@ -2525,7 +2527,12 @@ static int cmd_parser_exec(struct parser_exec_state *s)
|
|
|
|
cmd = cmd_val(s, 0);
|
|
|
|
- info = get_cmd_info(s->vgpu->gvt, cmd, s->ring_id);
|
|
+ /* fastpath for MI_NOOP */
|
|
+ if (cmd == MI_NOOP)
|
|
+ info = &cmd_info[mi_noop_index];
|
|
+ else
|
|
+ info = get_cmd_info(s->vgpu->gvt, cmd, s->ring_id);
|
|
+
|
|
if (info == NULL) {
|
|
gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x, addr_type=%s, ring %d, workload=%p\n",
|
|
cmd, get_opcode(cmd, s->ring_id),
|
|
@@ -2955,6 +2962,8 @@ static int init_cmd_table(struct intel_gvt *gvt)
|
|
kfree(e);
|
|
return -EEXIST;
|
|
}
|
|
+ if (cmd_info[i].opcode == OP_MI_NOOP)
|
|
+ mi_noop_index = i;
|
|
|
|
INIT_HLIST_NODE(&e->hlist);
|
|
add_cmd_entry(gvt, e);
|
|
--
|
|
2.21.0
|
|
|