1// SPDX-License-Identifier: MIT
 2/*
 3 * Copyright © 2021 Intel Corporation
 4 */
 5
 6#include <linux/string_helpers.h>
 7
 8#include "intel_guc_rc.h"
 9#include "intel_guc_print.h"
10#include "gt/intel_gt.h"
11#include "i915_drv.h"
12
13static bool __guc_rc_supported(struct intel_guc *guc)
14{
15	/* GuC RC is unavailable for pre-Gen12 */
16	return guc->submission_supported &&
17		GRAPHICS_VER(guc_to_i915(guc)) >= 12;
18}
19
20static bool __guc_rc_selected(struct intel_guc *guc)
21{
22	if (!intel_guc_rc_is_supported(guc))
23		return false;
24
25	return guc->submission_selected;
26}
27
28void intel_guc_rc_init_early(struct intel_guc *guc)
29{
30	guc->rc_supported = __guc_rc_supported(guc);
31	guc->rc_selected = __guc_rc_selected(guc);
32}
33
34static int guc_action_control_gucrc(struct intel_guc *guc, bool enable)
35{
36	u32 rc_mode = enable ? INTEL_GUCRC_FIRMWARE_CONTROL :
37				INTEL_GUCRC_HOST_CONTROL;
38	u32 action[] = {
39		INTEL_GUC_ACTION_SETUP_PC_GUCRC,
40		rc_mode
41	};
42	int ret;
43
44	ret = intel_guc_send(guc, action, ARRAY_SIZE(action));
45	ret = ret > 0 ? -EPROTO : ret;
46
47	return ret;
48}
49
50static int __guc_rc_control(struct intel_guc *guc, bool enable)
51{
52	struct intel_gt *gt = guc_to_gt(guc);
53	int ret;
54
55	if (!intel_uc_uses_guc_rc(&gt->uc))
56		return -EOPNOTSUPP;
57
58	if (!intel_guc_is_ready(guc))
59		return -EINVAL;
60
61	ret = guc_action_control_gucrc(guc, enable);
62	if (ret) {
63		guc_probe_error(guc, "Failed to %s RC (%pe)\n",
64				str_enable_disable(enable), ERR_PTR(ret));
65		return ret;
66	}
67
68	guc_info(guc, "RC %s\n", str_enabled_disabled(enable));
69
70	return 0;
71}
72
73int intel_guc_rc_enable(struct intel_guc *guc)
74{
75	return __guc_rc_control(guc, true);
76}
77
78int intel_guc_rc_disable(struct intel_guc *guc)
79{
80	return __guc_rc_control(guc, false);
81}