drivers/gpu/drm/xe/xe_gt_throttle.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2023 Intel Corporation
   4  */
   5
   6 #include <drm/drm_managed.h>
   7
   8 #include <regs/xe_gt_regs.h>
   9 #include "xe_device.h"
  10 #include "xe_gt.h"
  11 #include "xe_gt_printk.h"
  12 #include "xe_gt_sysfs.h"
  13 #include "xe_gt_throttle.h"
  14 #include "xe_mmio.h"
  15 #include "xe_pm.h"
  16
  17 /**
  18  * DOC: Xe GT Throttle
  19  *
  20  * Provides sysfs entries and other helpers for frequency throttle reasons in GT
  21  *
  22  * device/gt#/freq0/throttle/status - Overall status
  23  * device/gt#/freq0/throttle/reason_pl1 - Frequency throttle due to PL1
  24  * device/gt#/freq0/throttle/reason_pl2 - Frequency throttle due to PL2
  25  * device/gt#/freq0/throttle/reason_pl4 - Frequency throttle due to PL4, Iccmax etc.
  26  * device/gt#/freq0/throttle/reason_thermal - Frequency throttle due to thermal
  27  * device/gt#/freq0/throttle/reason_prochot - Frequency throttle due to prochot
  28  * device/gt#/freq0/throttle/reason_ratl - Frequency throttle due to RATL
  29  * device/gt#/freq0/throttle/reason_vr_thermalert - Frequency throttle due to VR THERMALERT
  30  * device/gt#/freq0/throttle/reason_vr_tdc -  Frequency throttle due to VR TDC
  31  */
  32
  33 static struct xe_gt *
  34 dev_to_gt(struct device *dev)
  35 {
  36         return kobj_to_gt(dev->kobj.parent);
  37 }
  38
  39 u32 xe_gt_throttle_get_limit_reasons(struct xe_gt *gt)
  40 {
  41         u32 reg;
  42
  43         xe_pm_runtime_get(gt_to_xe(gt));
  44         if (xe_gt_is_media_type(gt))
  45                 reg = xe_mmio_read32(&gt->mmio, MTL_MEDIA_PERF_LIMIT_REASONS);
  46         else
  47                 reg = xe_mmio_read32(&gt->mmio, GT0_PERF_LIMIT_REASONS);
  48         xe_pm_runtime_put(gt_to_xe(gt));
  49
  50         return reg;
  51 }
  52
  53 static u32 read_status(struct xe_gt *gt)
  54 {
  55         u32 status = xe_gt_throttle_get_limit_reasons(gt) & GT0_PERF_LIMIT_REASONS_MASK;
  56
  57         xe_gt_dbg(gt, "throttle reasons: 0x%08x\n", status);
  58         return status;
  59 }
  60
  61 static u32 read_reason_pl1(struct xe_gt *gt)
  62 {
  63         u32 pl1 = xe_gt_throttle_get_limit_reasons(gt) & POWER_LIMIT_1_MASK;
  64
  65         return pl1;
  66 }
  67
  68 static u32 read_reason_pl2(struct xe_gt *gt)
  69 {
  70         u32 pl2 = xe_gt_throttle_get_limit_reasons(gt) & POWER_LIMIT_2_MASK;
  71
  72         return pl2;
  73 }
  74
  75 static u32 read_reason_pl4(struct xe_gt *gt)
  76 {
  77         u32 pl4 = xe_gt_throttle_get_limit_reasons(gt) & POWER_LIMIT_4_MASK;
  78
  79         return pl4;
  80 }
  81
  82 static u32 read_reason_thermal(struct xe_gt *gt)
  83 {
  84         u32 thermal = xe_gt_throttle_get_limit_reasons(gt) & THERMAL_LIMIT_MASK;
  85
  86         return thermal;
  87 }
  88
  89 static u32 read_reason_prochot(struct xe_gt *gt)
  90 {
  91         u32 prochot = xe_gt_throttle_get_limit_reasons(gt) & PROCHOT_MASK;
  92
  93         return prochot;
  94 }
  95
  96 static u32 read_reason_ratl(struct xe_gt *gt)
  97 {
  98         u32 ratl = xe_gt_throttle_get_limit_reasons(gt) & RATL_MASK;
  99
 100         return ratl;
 101 }
 102
 103 static u32 read_reason_vr_thermalert(struct xe_gt *gt)
 104 {
 105         u32 thermalert = xe_gt_throttle_get_limit_reasons(gt) & VR_THERMALERT_MASK;
 106
 107         return thermalert;
 108 }
 109
 110 static u32 read_reason_vr_tdc(struct xe_gt *gt)
 111 {
 112         u32 tdc = xe_gt_throttle_get_limit_reasons(gt) & VR_TDC_MASK;
 113
 114         return tdc;
 115 }
 116
 117 static ssize_t status_show(struct device *dev,
 118                            struct device_attribute *attr,
 119                            char *buff)
 120 {
 121         struct xe_gt *gt = dev_to_gt(dev);
 122         bool status = !!read_status(gt);
 123
 124         return sysfs_emit(buff, "%u\n", status);
 125 }
 126 static DEVICE_ATTR_RO(status);
 127
 128 static ssize_t reason_pl1_show(struct device *dev,
 129                                struct device_attribute *attr,
 130                                char *buff)
 131 {
 132         struct xe_gt *gt = dev_to_gt(dev);
 133         bool pl1 = !!read_reason_pl1(gt);
 134
 135         return sysfs_emit(buff, "%u\n", pl1);
 136 }
 137 static DEVICE_ATTR_RO(reason_pl1);
 138
 139 static ssize_t reason_pl2_show(struct device *dev,
 140                                struct device_attribute *attr,
 141                                char *buff)
 142 {
 143         struct xe_gt *gt = dev_to_gt(dev);
 144         bool pl2 = !!read_reason_pl2(gt);
 145
 146         return sysfs_emit(buff, "%u\n", pl2);
 147 }
 148 static DEVICE_ATTR_RO(reason_pl2);
 149
 150 static ssize_t reason_pl4_show(struct device *dev,
 151                                struct device_attribute *attr,
 152                                char *buff)
 153 {
 154         struct xe_gt *gt = dev_to_gt(dev);
 155         bool pl4 = !!read_reason_pl4(gt);
 156
 157         return sysfs_emit(buff, "%u\n", pl4);
 158 }
 159 static DEVICE_ATTR_RO(reason_pl4);
 160
 161 static ssize_t reason_thermal_show(struct device *dev,
 162                                    struct device_attribute *attr,
 163                                    char *buff)
 164 {
 165         struct xe_gt *gt = dev_to_gt(dev);
 166         bool thermal = !!read_reason_thermal(gt);
 167
 168         return sysfs_emit(buff, "%u\n", thermal);
 169 }
 170 static DEVICE_ATTR_RO(reason_thermal);
 171
 172 static ssize_t reason_prochot_show(struct device *dev,
 173                                    struct device_attribute *attr,
 174                                    char *buff)
 175 {
 176         struct xe_gt *gt = dev_to_gt(dev);
 177         bool prochot = !!read_reason_prochot(gt);
 178
 179         return sysfs_emit(buff, "%u\n", prochot);
 180 }
 181 static DEVICE_ATTR_RO(reason_prochot);
 182
 183 static ssize_t reason_ratl_show(struct device *dev,
 184                                 struct device_attribute *attr,
 185                                 char *buff)
 186 {
 187         struct xe_gt *gt = dev_to_gt(dev);
 188         bool ratl = !!read_reason_ratl(gt);
 189
 190         return sysfs_emit(buff, "%u\n", ratl);
 191 }
 192 static DEVICE_ATTR_RO(reason_ratl);
 193
 194 static ssize_t reason_vr_thermalert_show(struct device *dev,
 195                                          struct device_attribute *attr,
 196                                          char *buff)
 197 {
 198         struct xe_gt *gt = dev_to_gt(dev);
 199         bool thermalert = !!read_reason_vr_thermalert(gt);
 200
 201         return sysfs_emit(buff, "%u\n", thermalert);
 202 }
 203 static DEVICE_ATTR_RO(reason_vr_thermalert);
 204
 205 static ssize_t reason_vr_tdc_show(struct device *dev,
 206                                   struct device_attribute *attr,
 207                                   char *buff)
 208 {
 209         struct xe_gt *gt = dev_to_gt(dev);
 210         bool tdc = !!read_reason_vr_tdc(gt);
 211
 212         return sysfs_emit(buff, "%u\n", tdc);
 213 }
 214 static DEVICE_ATTR_RO(reason_vr_tdc);
 215
 216 static struct attribute *throttle_attrs[] = {
 217         &dev_attr_status.attr,
 218         &dev_attr_reason_pl1.attr,
 219         &dev_attr_reason_pl2.attr,
 220         &dev_attr_reason_pl4.attr,
 221         &dev_attr_reason_thermal.attr,
 222         &dev_attr_reason_prochot.attr,
 223         &dev_attr_reason_ratl.attr,
 224         &dev_attr_reason_vr_thermalert.attr,
 225         &dev_attr_reason_vr_tdc.attr,
 226         NULL
 227 };
 228
 229 static const struct attribute_group throttle_group_attrs = {
 230         .name = "throttle",
 231         .attrs = throttle_attrs,
 232 };
 233
 234 static void gt_throttle_sysfs_fini(void *arg)
 235 {
 236         struct xe_gt *gt = arg;
 237
 238         sysfs_remove_group(gt->freq, &throttle_group_attrs);
 239 }
 240
 241 int xe_gt_throttle_init(struct xe_gt *gt)
 242 {
 243         struct xe_device *xe = gt_to_xe(gt);
 244         int err;
 245
 246         err = sysfs_create_group(gt->freq, &throttle_group_attrs);
 247         if (err)
 248                 return err;
 249
 250         return devm_add_action_or_reset(xe->drm.dev, gt_throttle_sysfs_fini, gt);
 251 }