1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2018 Broadcom
4 */
5
6 /**
7 * DOC: VC4 V3D performance monitor module
8 *
9 * The V3D block provides 16 hardware counters which can count various events.
10 */
11
12 #include "vc4_drv.h"
13 #include "vc4_regs.h"
14
15 #define VC4_PERFMONID_MIN 1
16 #define VC4_PERFMONID_MAX U32_MAX
17
vc4_perfmon_get(struct vc4_perfmon * perfmon)18 void vc4_perfmon_get(struct vc4_perfmon *perfmon)
19 {
20 struct vc4_dev *vc4;
21
22 if (!perfmon)
23 return;
24
25 vc4 = perfmon->dev;
26 if (WARN_ON_ONCE(vc4->is_vc5))
27 return;
28
29 refcount_inc(&perfmon->refcnt);
30 }
31
vc4_perfmon_put(struct vc4_perfmon * perfmon)32 void vc4_perfmon_put(struct vc4_perfmon *perfmon)
33 {
34 struct vc4_dev *vc4;
35
36 if (!perfmon)
37 return;
38
39 vc4 = perfmon->dev;
40 if (WARN_ON_ONCE(vc4->is_vc5))
41 return;
42
43 if (refcount_dec_and_test(&perfmon->refcnt))
44 kfree(perfmon);
45 }
46
vc4_perfmon_start(struct vc4_dev * vc4,struct vc4_perfmon * perfmon)47 void vc4_perfmon_start(struct vc4_dev *vc4, struct vc4_perfmon *perfmon)
48 {
49 unsigned int i;
50 u32 mask;
51
52 if (WARN_ON_ONCE(vc4->is_vc5))
53 return;
54
55 if (WARN_ON_ONCE(!perfmon || vc4->active_perfmon))
56 return;
57
58 for (i = 0; i < perfmon->ncounters; i++)
59 V3D_WRITE(V3D_PCTRS(i), perfmon->events[i]);
60
61 mask = GENMASK(perfmon->ncounters - 1, 0);
62 V3D_WRITE(V3D_PCTRC, mask);
63 V3D_WRITE(V3D_PCTRE, V3D_PCTRE_EN | mask);
64 vc4->active_perfmon = perfmon;
65 }
66
vc4_perfmon_stop(struct vc4_dev * vc4,struct vc4_perfmon * perfmon,bool capture)67 void vc4_perfmon_stop(struct vc4_dev *vc4, struct vc4_perfmon *perfmon,
68 bool capture)
69 {
70 unsigned int i;
71
72 if (WARN_ON_ONCE(vc4->is_vc5))
73 return;
74
75 if (WARN_ON_ONCE(!vc4->active_perfmon ||
76 perfmon != vc4->active_perfmon))
77 return;
78
79 if (capture) {
80 for (i = 0; i < perfmon->ncounters; i++)
81 perfmon->counters[i] += V3D_READ(V3D_PCTR(i));
82 }
83
84 V3D_WRITE(V3D_PCTRE, 0);
85 vc4->active_perfmon = NULL;
86 }
87
vc4_perfmon_find(struct vc4_file * vc4file,int id)88 struct vc4_perfmon *vc4_perfmon_find(struct vc4_file *vc4file, int id)
89 {
90 struct vc4_dev *vc4 = vc4file->dev;
91 struct vc4_perfmon *perfmon;
92
93 if (WARN_ON_ONCE(vc4->is_vc5))
94 return NULL;
95
96 mutex_lock(&vc4file->perfmon.lock);
97 perfmon = idr_find(&vc4file->perfmon.idr, id);
98 vc4_perfmon_get(perfmon);
99 mutex_unlock(&vc4file->perfmon.lock);
100
101 return perfmon;
102 }
103
vc4_perfmon_open_file(struct vc4_file * vc4file)104 void vc4_perfmon_open_file(struct vc4_file *vc4file)
105 {
106 struct vc4_dev *vc4 = vc4file->dev;
107
108 if (WARN_ON_ONCE(vc4->is_vc5))
109 return;
110
111 mutex_init(&vc4file->perfmon.lock);
112 idr_init_base(&vc4file->perfmon.idr, VC4_PERFMONID_MIN);
113 vc4file->dev = vc4;
114 }
115
vc4_perfmon_idr_del(int id,void * elem,void * data)116 static int vc4_perfmon_idr_del(int id, void *elem, void *data)
117 {
118 struct vc4_perfmon *perfmon = elem;
119 struct vc4_dev *vc4 = (struct vc4_dev *)data;
120
121 /* If the active perfmon is being destroyed, stop it first */
122 if (perfmon == vc4->active_perfmon)
123 vc4_perfmon_stop(vc4, perfmon, false);
124
125 vc4_perfmon_put(perfmon);
126
127 return 0;
128 }
129
vc4_perfmon_close_file(struct vc4_file * vc4file)130 void vc4_perfmon_close_file(struct vc4_file *vc4file)
131 {
132 struct vc4_dev *vc4 = vc4file->dev;
133
134 if (WARN_ON_ONCE(vc4->is_vc5))
135 return;
136
137 mutex_lock(&vc4file->perfmon.lock);
138 idr_for_each(&vc4file->perfmon.idr, vc4_perfmon_idr_del, vc4);
139 idr_destroy(&vc4file->perfmon.idr);
140 mutex_unlock(&vc4file->perfmon.lock);
141 mutex_destroy(&vc4file->perfmon.lock);
142 }
143
vc4_perfmon_create_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)144 int vc4_perfmon_create_ioctl(struct drm_device *dev, void *data,
145 struct drm_file *file_priv)
146 {
147 struct vc4_dev *vc4 = to_vc4_dev(dev);
148 struct vc4_file *vc4file = file_priv->driver_priv;
149 struct drm_vc4_perfmon_create *req = data;
150 struct vc4_perfmon *perfmon;
151 unsigned int i;
152 int ret;
153
154 if (WARN_ON_ONCE(vc4->is_vc5))
155 return -ENODEV;
156
157 if (!vc4->v3d) {
158 DRM_DEBUG("Creating perfmon no VC4 V3D probed\n");
159 return -ENODEV;
160 }
161
162 /* Number of monitored counters cannot exceed HW limits. */
163 if (req->ncounters > DRM_VC4_MAX_PERF_COUNTERS ||
164 !req->ncounters)
165 return -EINVAL;
166
167 /* Make sure all events are valid. */
168 for (i = 0; i < req->ncounters; i++) {
169 if (req->events[i] >= VC4_PERFCNT_NUM_EVENTS)
170 return -EINVAL;
171 }
172
173 perfmon = kzalloc(struct_size(perfmon, counters, req->ncounters),
174 GFP_KERNEL);
175 if (!perfmon)
176 return -ENOMEM;
177 perfmon->dev = vc4;
178
179 for (i = 0; i < req->ncounters; i++)
180 perfmon->events[i] = req->events[i];
181
182 perfmon->ncounters = req->ncounters;
183
184 refcount_set(&perfmon->refcnt, 1);
185
186 mutex_lock(&vc4file->perfmon.lock);
187 ret = idr_alloc(&vc4file->perfmon.idr, perfmon, VC4_PERFMONID_MIN,
188 VC4_PERFMONID_MAX, GFP_KERNEL);
189 mutex_unlock(&vc4file->perfmon.lock);
190
191 if (ret < 0) {
192 kfree(perfmon);
193 return ret;
194 }
195
196 req->id = ret;
197 return 0;
198 }
199
vc4_perfmon_destroy_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)200 int vc4_perfmon_destroy_ioctl(struct drm_device *dev, void *data,
201 struct drm_file *file_priv)
202 {
203 struct vc4_dev *vc4 = to_vc4_dev(dev);
204 struct vc4_file *vc4file = file_priv->driver_priv;
205 struct drm_vc4_perfmon_destroy *req = data;
206 struct vc4_perfmon *perfmon;
207
208 if (WARN_ON_ONCE(vc4->is_vc5))
209 return -ENODEV;
210
211 if (!vc4->v3d) {
212 DRM_DEBUG("Destroying perfmon no VC4 V3D probed\n");
213 return -ENODEV;
214 }
215
216 mutex_lock(&vc4file->perfmon.lock);
217 perfmon = idr_remove(&vc4file->perfmon.idr, req->id);
218 mutex_unlock(&vc4file->perfmon.lock);
219
220 if (!perfmon)
221 return -EINVAL;
222
223 vc4_perfmon_put(perfmon);
224 return 0;
225 }
226
vc4_perfmon_get_values_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)227 int vc4_perfmon_get_values_ioctl(struct drm_device *dev, void *data,
228 struct drm_file *file_priv)
229 {
230 struct vc4_dev *vc4 = to_vc4_dev(dev);
231 struct vc4_file *vc4file = file_priv->driver_priv;
232 struct drm_vc4_perfmon_get_values *req = data;
233 struct vc4_perfmon *perfmon;
234 int ret;
235
236 if (WARN_ON_ONCE(vc4->is_vc5))
237 return -ENODEV;
238
239 if (!vc4->v3d) {
240 DRM_DEBUG("Getting perfmon no VC4 V3D probed\n");
241 return -ENODEV;
242 }
243
244 mutex_lock(&vc4file->perfmon.lock);
245 perfmon = idr_find(&vc4file->perfmon.idr, req->id);
246 vc4_perfmon_get(perfmon);
247 mutex_unlock(&vc4file->perfmon.lock);
248
249 if (!perfmon)
250 return -EINVAL;
251
252 if (copy_to_user(u64_to_user_ptr(req->values_ptr), perfmon->counters,
253 perfmon->ncounters * sizeof(u64)))
254 ret = -EFAULT;
255 else
256 ret = 0;
257
258 vc4_perfmon_put(perfmon);
259 return ret;
260 }
261