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 * 36 * - act_freq: The actual resolved frequency decided by PCODE. 37 * - cur_freq: The current one requested by GuC PC to the PCODE. 38 * - rpn_freq: The Render Performance (RP) N level, which is the minimal one. 39 * - rpa_freq: The Render Performance (RP) A level, which is the achiveable one. 40 * Calculated by PCODE at runtime based on multiple running conditions 41 * - rpe_freq: The Render Performance (RP) E level, which is the efficient one. 42 * Calculated by PCODE at runtime based on multiple running conditions 43 * - rp0_freq: The Render Performance (RP) 0 level, which is the maximum one. 44 * 45 * device/tile#/gt#/freq0/<item>_freq *read-write* files: 46 * 47 * - min_freq: Min frequency request. 48 * - max_freq: Max frequency request. 49 * If max <= min, then freq_min becomes a fixed frequency request. 50 */ 51 52 static struct xe_guc_pc * 53 dev_to_pc(struct device *dev) 54 { 55 return &kobj_to_gt(dev->kobj.parent)->uc.guc.pc; 56 } 57 58 static struct xe_device * 59 dev_to_xe(struct device *dev) 60 { 61 return gt_to_xe(kobj_to_gt(dev->kobj.parent)); 62 } 63 64 static ssize_t act_freq_show(struct kobject *kobj, 65 struct kobj_attribute *attr, char *buf) 66 { 67 struct device *dev = kobj_to_dev(kobj); 68 struct xe_guc_pc *pc = dev_to_pc(dev); 69 u32 freq; 70 71 xe_pm_runtime_get(dev_to_xe(dev)); 72 freq = xe_guc_pc_get_act_freq(pc); 73 xe_pm_runtime_put(dev_to_xe(dev)); 74 75 return sysfs_emit(buf, "%d\n", freq); 76 } 77 static struct kobj_attribute attr_act_freq = __ATTR_RO(act_freq); 78 79 static ssize_t cur_freq_show(struct kobject *kobj, 80 struct kobj_attribute *attr, char *buf) 81 { 82 struct device *dev = kobj_to_dev(kobj); 83 struct xe_guc_pc *pc = dev_to_pc(dev); 84 u32 freq; 85 ssize_t ret; 86 87 xe_pm_runtime_get(dev_to_xe(dev)); 88 ret = xe_guc_pc_get_cur_freq(pc, &freq); 89 xe_pm_runtime_put(dev_to_xe(dev)); 90 if (ret) 91 return ret; 92 93 return sysfs_emit(buf, "%d\n", freq); 94 } 95 static struct kobj_attribute attr_cur_freq = __ATTR_RO(cur_freq); 96 97 static ssize_t rp0_freq_show(struct kobject *kobj, 98 struct kobj_attribute *attr, char *buf) 99 { 100 struct device *dev = kobj_to_dev(kobj); 101 struct xe_guc_pc *pc = dev_to_pc(dev); 102 103 return sysfs_emit(buf, "%d\n", xe_guc_pc_get_rp0_freq(pc)); 104 } 105 static struct kobj_attribute attr_rp0_freq = __ATTR_RO(rp0_freq); 106 107 static ssize_t rpe_freq_show(struct kobject *kobj, 108 struct kobj_attribute *attr, char *buf) 109 { 110 struct device *dev = kobj_to_dev(kobj); 111 struct xe_guc_pc *pc = dev_to_pc(dev); 112 u32 freq; 113 114 xe_pm_runtime_get(dev_to_xe(dev)); 115 freq = xe_guc_pc_get_rpe_freq(pc); 116 xe_pm_runtime_put(dev_to_xe(dev)); 117 118 return sysfs_emit(buf, "%d\n", freq); 119 } 120 static struct kobj_attribute attr_rpe_freq = __ATTR_RO(rpe_freq); 121 122 static ssize_t rpa_freq_show(struct kobject *kobj, 123 struct kobj_attribute *attr, char *buf) 124 { 125 struct device *dev = kobj_to_dev(kobj); 126 struct xe_guc_pc *pc = dev_to_pc(dev); 127 u32 freq; 128 129 xe_pm_runtime_get(dev_to_xe(dev)); 130 freq = xe_guc_pc_get_rpa_freq(pc); 131 xe_pm_runtime_put(dev_to_xe(dev)); 132 133 return sysfs_emit(buf, "%d\n", freq); 134 } 135 static struct kobj_attribute attr_rpa_freq = __ATTR_RO(rpa_freq); 136 137 static ssize_t rpn_freq_show(struct kobject *kobj, 138 struct kobj_attribute *attr, char *buf) 139 { 140 struct device *dev = kobj_to_dev(kobj); 141 struct xe_guc_pc *pc = dev_to_pc(dev); 142 143 return sysfs_emit(buf, "%d\n", xe_guc_pc_get_rpn_freq(pc)); 144 } 145 static struct kobj_attribute attr_rpn_freq = __ATTR_RO(rpn_freq); 146 147 static ssize_t min_freq_show(struct kobject *kobj, 148 struct kobj_attribute *attr, char *buf) 149 { 150 struct device *dev = kobj_to_dev(kobj); 151 struct xe_guc_pc *pc = dev_to_pc(dev); 152 u32 freq; 153 ssize_t ret; 154 155 xe_pm_runtime_get(dev_to_xe(dev)); 156 ret = xe_guc_pc_get_min_freq(pc, &freq); 157 xe_pm_runtime_put(dev_to_xe(dev)); 158 if (ret) 159 return ret; 160 161 return sysfs_emit(buf, "%d\n", freq); 162 } 163 164 static ssize_t min_freq_store(struct kobject *kobj, 165 struct kobj_attribute *attr, const char *buff, size_t count) 166 { 167 struct device *dev = kobj_to_dev(kobj); 168 struct xe_guc_pc *pc = dev_to_pc(dev); 169 u32 freq; 170 ssize_t ret; 171 172 ret = kstrtou32(buff, 0, &freq); 173 if (ret) 174 return ret; 175 176 xe_pm_runtime_get(dev_to_xe(dev)); 177 ret = xe_guc_pc_set_min_freq(pc, freq); 178 xe_pm_runtime_put(dev_to_xe(dev)); 179 if (ret) 180 return ret; 181 182 return count; 183 } 184 static struct kobj_attribute attr_min_freq = __ATTR_RW(min_freq); 185 186 static ssize_t max_freq_show(struct kobject *kobj, 187 struct kobj_attribute *attr, char *buf) 188 { 189 struct device *dev = kobj_to_dev(kobj); 190 struct xe_guc_pc *pc = dev_to_pc(dev); 191 u32 freq; 192 ssize_t ret; 193 194 xe_pm_runtime_get(dev_to_xe(dev)); 195 ret = xe_guc_pc_get_max_freq(pc, &freq); 196 xe_pm_runtime_put(dev_to_xe(dev)); 197 if (ret) 198 return ret; 199 200 return sysfs_emit(buf, "%d\n", freq); 201 } 202 203 static ssize_t max_freq_store(struct kobject *kobj, 204 struct kobj_attribute *attr, const char *buff, size_t count) 205 { 206 struct device *dev = kobj_to_dev(kobj); 207 struct xe_guc_pc *pc = dev_to_pc(dev); 208 u32 freq; 209 ssize_t ret; 210 211 ret = kstrtou32(buff, 0, &freq); 212 if (ret) 213 return ret; 214 215 xe_pm_runtime_get(dev_to_xe(dev)); 216 ret = xe_guc_pc_set_max_freq(pc, freq); 217 xe_pm_runtime_put(dev_to_xe(dev)); 218 if (ret) 219 return ret; 220 221 return count; 222 } 223 static struct kobj_attribute attr_max_freq = __ATTR_RW(max_freq); 224 225 static ssize_t power_profile_show(struct kobject *kobj, 226 struct kobj_attribute *attr, 227 char *buff) 228 { 229 struct device *dev = kobj_to_dev(kobj); 230 231 xe_guc_pc_get_power_profile(dev_to_pc(dev), buff); 232 233 return strlen(buff); 234 } 235 236 static ssize_t power_profile_store(struct kobject *kobj, 237 struct kobj_attribute *attr, 238 const char *buff, size_t count) 239 { 240 struct device *dev = kobj_to_dev(kobj); 241 struct xe_guc_pc *pc = dev_to_pc(dev); 242 int err; 243 244 xe_pm_runtime_get(dev_to_xe(dev)); 245 err = xe_guc_pc_set_power_profile(pc, buff); 246 xe_pm_runtime_put(dev_to_xe(dev)); 247 248 return err ?: count; 249 } 250 static struct kobj_attribute attr_power_profile = __ATTR_RW(power_profile); 251 252 static const struct attribute *freq_attrs[] = { 253 &attr_act_freq.attr, 254 &attr_cur_freq.attr, 255 &attr_rp0_freq.attr, 256 &attr_rpa_freq.attr, 257 &attr_rpe_freq.attr, 258 &attr_rpn_freq.attr, 259 &attr_min_freq.attr, 260 &attr_max_freq.attr, 261 &attr_power_profile.attr, 262 NULL 263 }; 264 265 static void freq_fini(void *arg) 266 { 267 struct kobject *kobj = arg; 268 269 sysfs_remove_files(kobj, freq_attrs); 270 kobject_put(kobj); 271 } 272 273 /** 274 * xe_gt_freq_init - Initialize Xe Freq component 275 * @gt: Xe GT object 276 * 277 * It needs to be initialized after GT Sysfs and GuC PC components are ready. 278 * 279 * Returns: Returns error value for failure and 0 for success. 280 */ 281 int xe_gt_freq_init(struct xe_gt *gt) 282 { 283 struct xe_device *xe = gt_to_xe(gt); 284 int err; 285 286 if (xe->info.skip_guc_pc) 287 return 0; 288 289 gt->freq = kobject_create_and_add("freq0", gt->sysfs); 290 if (!gt->freq) 291 return -ENOMEM; 292 293 err = sysfs_create_files(gt->freq, freq_attrs); 294 if (err) 295 return err; 296 297 err = devm_add_action_or_reset(xe->drm.dev, freq_fini, gt->freq); 298 if (err) 299 return err; 300 301 return xe_gt_throttle_init(gt); 302 } 303