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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2023 Intel Corporation
4 */
5
6#include <drm/drm_managed.h>
7
8#include "xe_device.h"
9#include "xe_gt.h"
10#include "xe_gt_idle.h"
11#include "xe_gt_sysfs.h"
12#include "xe_guc_pc.h"
13#include "regs/xe_gt_regs.h"
14#include "xe_mmio.h"
15
16/**
17 * DOC: Xe GT Idle
18 *
19 * Contains functions that init GT idle features like C6
20 *
21 * device/gt#/gtidle/name - name of the state
22 * device/gt#/gtidle/idle_residency_ms - Provides residency of the idle state in ms
23 * device/gt#/gtidle/idle_status - Provides current idle state
24 */
25
26static struct xe_gt_idle *dev_to_gtidle(struct device *dev)
27{
28 struct kobject *kobj = &dev->kobj;
29
30 return &kobj_to_gt(kobj->parent)->gtidle;
31}
32
33static struct xe_gt *gtidle_to_gt(struct xe_gt_idle *gtidle)
34{
35 return container_of(gtidle, struct xe_gt, gtidle);
36}
37
38static struct xe_guc_pc *gtidle_to_pc(struct xe_gt_idle *gtidle)
39{
40 return >idle_to_gt(gtidle)->uc.guc.pc;
41}
42
43static const char *gt_idle_state_to_string(enum xe_gt_idle_state state)
44{
45 switch (state) {
46 case GT_IDLE_C0:
47 return "gt-c0";
48 case GT_IDLE_C6:
49 return "gt-c6";
50 default:
51 return "unknown";
52 }
53}
54
55static u64 get_residency_ms(struct xe_gt_idle *gtidle, u64 cur_residency)
56{
57 u64 delta, overflow_residency, prev_residency;
58
59 overflow_residency = BIT_ULL(32);
60
61 /*
62 * Counter wrap handling
63 * Store previous hw counter values for counter wrap-around handling
64 * Relying on sufficient frequency of queries otherwise counters can still wrap.
65 */
66 prev_residency = gtidle->prev_residency;
67 gtidle->prev_residency = cur_residency;
68
69 /* delta */
70 if (cur_residency >= prev_residency)
71 delta = cur_residency - prev_residency;
72 else
73 delta = cur_residency + (overflow_residency - prev_residency);
74
75 /* Add delta to extended raw driver copy of idle residency */
76 cur_residency = gtidle->cur_residency + delta;
77 gtidle->cur_residency = cur_residency;
78
79 /* residency multiplier in ns, convert to ms */
80 cur_residency = mul_u64_u32_div(cur_residency, gtidle->residency_multiplier, 1e6);
81
82 return cur_residency;
83}
84
85static ssize_t name_show(struct device *dev,
86 struct device_attribute *attr, char *buff)
87{
88 struct xe_gt_idle *gtidle = dev_to_gtidle(dev);
89
90 return sysfs_emit(buff, "%s\n", gtidle->name);
91}
92static DEVICE_ATTR_RO(name);
93
94static ssize_t idle_status_show(struct device *dev,
95 struct device_attribute *attr, char *buff)
96{
97 struct xe_gt_idle *gtidle = dev_to_gtidle(dev);
98 struct xe_guc_pc *pc = gtidle_to_pc(gtidle);
99 enum xe_gt_idle_state state;
100
101 state = gtidle->idle_status(pc);
102
103 return sysfs_emit(buff, "%s\n", gt_idle_state_to_string(state));
104}
105static DEVICE_ATTR_RO(idle_status);
106
107static ssize_t idle_residency_ms_show(struct device *dev,
108 struct device_attribute *attr, char *buff)
109{
110 struct xe_gt_idle *gtidle = dev_to_gtidle(dev);
111 struct xe_guc_pc *pc = gtidle_to_pc(gtidle);
112 u64 residency;
113
114 residency = gtidle->idle_residency(pc);
115 return sysfs_emit(buff, "%llu\n", get_residency_ms(gtidle, residency));
116}
117static DEVICE_ATTR_RO(idle_residency_ms);
118
119static const struct attribute *gt_idle_attrs[] = {
120 &dev_attr_name.attr,
121 &dev_attr_idle_status.attr,
122 &dev_attr_idle_residency_ms.attr,
123 NULL,
124};
125
126static void gt_idle_sysfs_fini(struct drm_device *drm, void *arg)
127{
128 struct kobject *kobj = arg;
129
130 sysfs_remove_files(kobj, gt_idle_attrs);
131 kobject_put(kobj);
132}
133
134void xe_gt_idle_sysfs_init(struct xe_gt_idle *gtidle)
135{
136 struct xe_gt *gt = gtidle_to_gt(gtidle);
137 struct xe_device *xe = gt_to_xe(gt);
138 struct kobject *kobj;
139 int err;
140
141 kobj = kobject_create_and_add("gtidle", gt->sysfs);
142 if (!kobj) {
143 drm_warn(&xe->drm, "%s failed, err: %d\n", __func__, -ENOMEM);
144 return;
145 }
146
147 if (xe_gt_is_media_type(gt)) {
148 sprintf(gtidle->name, "gt%d-mc", gt->info.id);
149 gtidle->idle_residency = xe_guc_pc_mc6_residency;
150 } else {
151 sprintf(gtidle->name, "gt%d-rc", gt->info.id);
152 gtidle->idle_residency = xe_guc_pc_rc6_residency;
153 }
154
155 /* Multiplier for Residency counter in units of 1.28us */
156 gtidle->residency_multiplier = 1280;
157 gtidle->idle_status = xe_guc_pc_c_status;
158
159 err = sysfs_create_files(kobj, gt_idle_attrs);
160 if (err) {
161 kobject_put(kobj);
162 drm_warn(&xe->drm, "failed to register gtidle sysfs, err: %d\n", err);
163 return;
164 }
165
166 err = drmm_add_action_or_reset(&xe->drm, gt_idle_sysfs_fini, kobj);
167 if (err)
168 drm_warn(&xe->drm, "%s: drmm_add_action_or_reset failed, err: %d\n",
169 __func__, err);
170}
171
172void xe_gt_idle_enable_c6(struct xe_gt *gt)
173{
174 xe_device_assert_mem_access(gt_to_xe(gt));
175 xe_force_wake_assert_held(gt_to_fw(gt), XE_FW_GT);
176
177 /* Units of 1280 ns for a total of 5s */
178 xe_mmio_write32(gt, RC_IDLE_HYSTERSIS, 0x3B9ACA);
179 /* Enable RC6 */
180 xe_mmio_write32(gt, RC_CONTROL,
181 RC_CTL_HW_ENABLE | RC_CTL_TO_MODE | RC_CTL_RC6_ENABLE);
182}
183
184void xe_gt_idle_disable_c6(struct xe_gt *gt)
185{
186 xe_device_assert_mem_access(gt_to_xe(gt));
187 xe_force_wake_assert_held(gt_to_fw(gt), XE_FORCEWAKE_ALL);
188
189 xe_mmio_write32(gt, PG_ENABLE, 0);
190 xe_mmio_write32(gt, RC_CONTROL, 0);
191 xe_mmio_write32(gt, RC_STATE, 0);
192}