xref: /linux/drivers/gpu/drm/xe/xe_gt_throttle.c (revision 2c1ed907520c50326b8f604907a8478b27881a2e)
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 *
dev_to_gt(struct device * dev)34 dev_to_gt(struct device *dev)
35 {
36 	return kobj_to_gt(dev->kobj.parent);
37 }
38 
xe_gt_throttle_get_limit_reasons(struct xe_gt * gt)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 
read_status(struct xe_gt * gt)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 
read_reason_pl1(struct xe_gt * gt)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 
read_reason_pl2(struct xe_gt * gt)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 
read_reason_pl4(struct xe_gt * gt)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 
read_reason_thermal(struct xe_gt * gt)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 
read_reason_prochot(struct xe_gt * gt)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 
read_reason_ratl(struct xe_gt * gt)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 
read_reason_vr_thermalert(struct xe_gt * gt)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 
read_reason_vr_tdc(struct xe_gt * gt)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 
status_show(struct device * dev,struct device_attribute * attr,char * buff)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 
reason_pl1_show(struct device * dev,struct device_attribute * attr,char * buff)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 
reason_pl2_show(struct device * dev,struct device_attribute * attr,char * buff)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 
reason_pl4_show(struct device * dev,struct device_attribute * attr,char * buff)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 
reason_thermal_show(struct device * dev,struct device_attribute * attr,char * buff)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 
reason_prochot_show(struct device * dev,struct device_attribute * attr,char * buff)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 
reason_ratl_show(struct device * dev,struct device_attribute * attr,char * buff)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 
reason_vr_thermalert_show(struct device * dev,struct device_attribute * attr,char * buff)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 
reason_vr_tdc_show(struct device * dev,struct device_attribute * attr,char * buff)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 
gt_throttle_sysfs_fini(void * arg)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 
xe_gt_throttle_init(struct xe_gt * gt)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 }
252