tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2023 Intel Corporation
4 */
5
6#include "xe_gt_freq.h"
7
8#include <linux/kobject.h>
9#include <linux/sysfs.h>
10
11#include <drm/drm_managed.h>
12#include <drm/drm_print.h>
13
14#include "xe_gt_sysfs.h"
15#include "xe_gt_throttle.h"
16#include "xe_gt_types.h"
17#include "xe_guc_pc.h"
18#include "xe_pm.h"
19
20/**
21 * DOC: Xe GT Frequency Management
22 *
23 * This component is responsible for the raw GT frequency management, including
24 * the sysfs API.
25 *
26 * Underneath, Xe enables GuC SLPC automated frequency management. GuC is then
27 * allowed to request PCODE any frequency between the Minimum and the Maximum
28 * selected by this component. Furthermore, it is important to highlight that
29 * PCODE is the ultimate decision maker of the actual running frequency, based
30 * on thermal and other running conditions.
31 *
32 * Xe's Freq provides a sysfs API for frequency management:
33 *
34 * device/tile#/gt#/freq0/<item>_freq *read-only* files:
35 * - act_freq: The actual resolved frequency decided by PCODE.
36 * - cur_freq: The current one requested by GuC PC to the PCODE.
37 * - rpn_freq: The Render Performance (RP) N level, which is the minimal one.
38 * - rpe_freq: The Render Performance (RP) E level, which is the efficient one.
39 * - rp0_freq: The Render Performance (RP) 0 level, which is the maximum one.
40 *
41 * device/tile#/gt#/freq0/<item>_freq *read-write* files:
42 * - min_freq: Min frequency request.
43 * - max_freq: Max frequency request.
44 * If max <= min, then freq_min becomes a fixed frequency request.
45 */
46
47static struct xe_guc_pc *
48dev_to_pc(struct device *dev)
49{
50 return &kobj_to_gt(dev->kobj.parent)->uc.guc.pc;
51}
52
53static struct xe_device *
54dev_to_xe(struct device *dev)
55{
56 return gt_to_xe(kobj_to_gt(dev->kobj.parent));
57}
58
59static ssize_t act_freq_show(struct device *dev,
60 struct device_attribute *attr, char *buf)
61{
62 struct xe_guc_pc *pc = dev_to_pc(dev);
63 u32 freq;
64
65 xe_pm_runtime_get(dev_to_xe(dev));
66 freq = xe_guc_pc_get_act_freq(pc);
67 xe_pm_runtime_put(dev_to_xe(dev));
68
69 return sysfs_emit(buf, "%d\n", freq);
70}
71static DEVICE_ATTR_RO(act_freq);
72
73static ssize_t cur_freq_show(struct device *dev,
74 struct device_attribute *attr, char *buf)
75{
76 struct xe_guc_pc *pc = dev_to_pc(dev);
77 u32 freq;
78 ssize_t ret;
79
80 xe_pm_runtime_get(dev_to_xe(dev));
81 ret = xe_guc_pc_get_cur_freq(pc, &freq);
82 xe_pm_runtime_put(dev_to_xe(dev));
83 if (ret)
84 return ret;
85
86 return sysfs_emit(buf, "%d\n", freq);
87}
88static DEVICE_ATTR_RO(cur_freq);
89
90static ssize_t rp0_freq_show(struct device *dev,
91 struct device_attribute *attr, char *buf)
92{
93 struct xe_guc_pc *pc = dev_to_pc(dev);
94 u32 freq;
95
96 xe_pm_runtime_get(dev_to_xe(dev));
97 freq = xe_guc_pc_get_rp0_freq(pc);
98 xe_pm_runtime_put(dev_to_xe(dev));
99
100 return sysfs_emit(buf, "%d\n", freq);
101}
102static DEVICE_ATTR_RO(rp0_freq);
103
104static ssize_t rpe_freq_show(struct device *dev,
105 struct device_attribute *attr, char *buf)
106{
107 struct xe_guc_pc *pc = dev_to_pc(dev);
108 u32 freq;
109
110 xe_pm_runtime_get(dev_to_xe(dev));
111 freq = xe_guc_pc_get_rpe_freq(pc);
112 xe_pm_runtime_put(dev_to_xe(dev));
113
114 return sysfs_emit(buf, "%d\n", freq);
115}
116static DEVICE_ATTR_RO(rpe_freq);
117
118static ssize_t rpa_freq_show(struct device *dev,
119 struct device_attribute *attr, char *buf)
120{
121 struct xe_guc_pc *pc = dev_to_pc(dev);
122 u32 freq;
123
124 xe_pm_runtime_get(dev_to_xe(dev));
125 freq = xe_guc_pc_get_rpa_freq(pc);
126 xe_pm_runtime_put(dev_to_xe(dev));
127
128 return sysfs_emit(buf, "%d\n", freq);
129}
130static DEVICE_ATTR_RO(rpa_freq);
131
132static ssize_t rpn_freq_show(struct device *dev,
133 struct device_attribute *attr, char *buf)
134{
135 struct xe_guc_pc *pc = dev_to_pc(dev);
136
137 return sysfs_emit(buf, "%d\n", xe_guc_pc_get_rpn_freq(pc));
138}
139static DEVICE_ATTR_RO(rpn_freq);
140
141static ssize_t min_freq_show(struct device *dev,
142 struct device_attribute *attr, char *buf)
143{
144 struct xe_guc_pc *pc = dev_to_pc(dev);
145 u32 freq;
146 ssize_t ret;
147
148 xe_pm_runtime_get(dev_to_xe(dev));
149 ret = xe_guc_pc_get_min_freq(pc, &freq);
150 xe_pm_runtime_put(dev_to_xe(dev));
151 if (ret)
152 return ret;
153
154 return sysfs_emit(buf, "%d\n", freq);
155}
156
157static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr,
158 const char *buff, size_t count)
159{
160 struct xe_guc_pc *pc = dev_to_pc(dev);
161 u32 freq;
162 ssize_t ret;
163
164 ret = kstrtou32(buff, 0, &freq);
165 if (ret)
166 return ret;
167
168 xe_pm_runtime_get(dev_to_xe(dev));
169 ret = xe_guc_pc_set_min_freq(pc, freq);
170 xe_pm_runtime_put(dev_to_xe(dev));
171 if (ret)
172 return ret;
173
174 return count;
175}
176static DEVICE_ATTR_RW(min_freq);
177
178static ssize_t max_freq_show(struct device *dev,
179 struct device_attribute *attr, char *buf)
180{
181 struct xe_guc_pc *pc = dev_to_pc(dev);
182 u32 freq;
183 ssize_t ret;
184
185 xe_pm_runtime_get(dev_to_xe(dev));
186 ret = xe_guc_pc_get_max_freq(pc, &freq);
187 xe_pm_runtime_put(dev_to_xe(dev));
188 if (ret)
189 return ret;
190
191 return sysfs_emit(buf, "%d\n", freq);
192}
193
194static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr,
195 const char *buff, size_t count)
196{
197 struct xe_guc_pc *pc = dev_to_pc(dev);
198 u32 freq;
199 ssize_t ret;
200
201 ret = kstrtou32(buff, 0, &freq);
202 if (ret)
203 return ret;
204
205 xe_pm_runtime_get(dev_to_xe(dev));
206 ret = xe_guc_pc_set_max_freq(pc, freq);
207 xe_pm_runtime_put(dev_to_xe(dev));
208 if (ret)
209 return ret;
210
211 return count;
212}
213static DEVICE_ATTR_RW(max_freq);
214
215static const struct attribute *freq_attrs[] = {
216 &dev_attr_act_freq.attr,
217 &dev_attr_cur_freq.attr,
218 &dev_attr_rp0_freq.attr,
219 &dev_attr_rpa_freq.attr,
220 &dev_attr_rpe_freq.attr,
221 &dev_attr_rpn_freq.attr,
222 &dev_attr_min_freq.attr,
223 &dev_attr_max_freq.attr,
224 NULL
225};
226
227static void freq_fini(void *arg)
228{
229 struct kobject *kobj = arg;
230
231 sysfs_remove_files(kobj, freq_attrs);
232 kobject_put(kobj);
233}
234
235/**
236 * xe_gt_freq_init - Initialize Xe Freq component
237 * @gt: Xe GT object
238 *
239 * It needs to be initialized after GT Sysfs and GuC PC components are ready.
240 *
241 * Returns: Returns error value for failure and 0 for success.
242 */
243int xe_gt_freq_init(struct xe_gt *gt)
244{
245 struct xe_device *xe = gt_to_xe(gt);
246 int err;
247
248 if (xe->info.skip_guc_pc)
249 return 0;
250
251 gt->freq = kobject_create_and_add("freq0", gt->sysfs);
252 if (!gt->freq)
253 return -ENOMEM;
254
255 err = sysfs_create_files(gt->freq, freq_attrs);
256 if (err)
257 return err;
258
259 err = devm_add_action_or_reset(xe->drm.dev, freq_fini, gt->freq);
260 if (err)
261 return err;
262
263 return xe_gt_throttle_init(gt);
264}