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 if (perfmon)
21 refcount_inc(&perfmon->refcnt);
22 }
23
vc4_perfmon_put(struct vc4_perfmon * perfmon)24 void vc4_perfmon_put(struct vc4_perfmon *perfmon)
25 {
26 if (perfmon && refcount_dec_and_test(&perfmon->refcnt))
27 kfree(perfmon);
28 }
29
vc4_perfmon_start(struct vc4_dev * vc4,struct vc4_perfmon * perfmon)30 void vc4_perfmon_start(struct vc4_dev *vc4, struct vc4_perfmon *perfmon)
31 {
32 unsigned int i;
33 u32 mask;
34
35 if (WARN_ON_ONCE(!perfmon || vc4->active_perfmon))
36 return;
37
38 for (i = 0; i < perfmon->ncounters; i++)
39 V3D_WRITE(V3D_PCTRS(i), perfmon->events[i]);
40
41 mask = GENMASK(perfmon->ncounters - 1, 0);
42 V3D_WRITE(V3D_PCTRC, mask);
43 V3D_WRITE(V3D_PCTRE, V3D_PCTRE_EN | mask);
44 vc4->active_perfmon = perfmon;
45 }
46
vc4_perfmon_stop(struct vc4_dev * vc4,struct vc4_perfmon * perfmon,bool capture)47 void vc4_perfmon_stop(struct vc4_dev *vc4, struct vc4_perfmon *perfmon,
48 bool capture)
49 {
50 unsigned int i;
51
52 if (WARN_ON_ONCE(!vc4->active_perfmon ||
53 perfmon != vc4->active_perfmon))
54 return;
55
56 if (capture) {
57 for (i = 0; i < perfmon->ncounters; i++)
58 perfmon->counters[i] += V3D_READ(V3D_PCTR(i));
59 }
60
61 V3D_WRITE(V3D_PCTRE, 0);
62 vc4->active_perfmon = NULL;
63 }
64
vc4_perfmon_find(struct vc4_file * vc4file,int id)65 struct vc4_perfmon *vc4_perfmon_find(struct vc4_file *vc4file, int id)
66 {
67 struct vc4_perfmon *perfmon;
68
69 mutex_lock(&vc4file->perfmon.lock);
70 perfmon = idr_find(&vc4file->perfmon.idr, id);
71 vc4_perfmon_get(perfmon);
72 mutex_unlock(&vc4file->perfmon.lock);
73
74 return perfmon;
75 }
76
vc4_perfmon_open_file(struct vc4_file * vc4file)77 void vc4_perfmon_open_file(struct vc4_file *vc4file)
78 {
79 mutex_init(&vc4file->perfmon.lock);
80 idr_init(&vc4file->perfmon.idr);
81 }
82
vc4_perfmon_idr_del(int id,void * elem,void * data)83 static int vc4_perfmon_idr_del(int id, void *elem, void *data)
84 {
85 struct vc4_perfmon *perfmon = elem;
86
87 vc4_perfmon_put(perfmon);
88
89 return 0;
90 }
91
vc4_perfmon_close_file(struct vc4_file * vc4file)92 void vc4_perfmon_close_file(struct vc4_file *vc4file)
93 {
94 mutex_lock(&vc4file->perfmon.lock);
95 idr_for_each(&vc4file->perfmon.idr, vc4_perfmon_idr_del, NULL);
96 idr_destroy(&vc4file->perfmon.idr);
97 mutex_unlock(&vc4file->perfmon.lock);
98 }
99
vc4_perfmon_create_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)100 int vc4_perfmon_create_ioctl(struct drm_device *dev, void *data,
101 struct drm_file *file_priv)
102 {
103 struct vc4_dev *vc4 = to_vc4_dev(dev);
104 struct vc4_file *vc4file = file_priv->driver_priv;
105 struct drm_vc4_perfmon_create *req = data;
106 struct vc4_perfmon *perfmon;
107 unsigned int i;
108 int ret;
109
110 if (!vc4->v3d) {
111 DRM_DEBUG("Creating perfmon no VC4 V3D probed\n");
112 return -ENODEV;
113 }
114
115 /* Number of monitored counters cannot exceed HW limits. */
116 if (req->ncounters > DRM_VC4_MAX_PERF_COUNTERS ||
117 !req->ncounters)
118 return -EINVAL;
119
120 /* Make sure all events are valid. */
121 for (i = 0; i < req->ncounters; i++) {
122 if (req->events[i] >= VC4_PERFCNT_NUM_EVENTS)
123 return -EINVAL;
124 }
125
126 perfmon = kzalloc(struct_size(perfmon, counters, req->ncounters),
127 GFP_KERNEL);
128 if (!perfmon)
129 return -ENOMEM;
130
131 for (i = 0; i < req->ncounters; i++)
132 perfmon->events[i] = req->events[i];
133
134 perfmon->ncounters = req->ncounters;
135
136 refcount_set(&perfmon->refcnt, 1);
137
138 mutex_lock(&vc4file->perfmon.lock);
139 ret = idr_alloc(&vc4file->perfmon.idr, perfmon, VC4_PERFMONID_MIN,
140 VC4_PERFMONID_MAX, GFP_KERNEL);
141 mutex_unlock(&vc4file->perfmon.lock);
142
143 if (ret < 0) {
144 kfree(perfmon);
145 return ret;
146 }
147
148 req->id = ret;
149 return 0;
150 }
151
vc4_perfmon_destroy_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)152 int vc4_perfmon_destroy_ioctl(struct drm_device *dev, void *data,
153 struct drm_file *file_priv)
154 {
155 struct vc4_dev *vc4 = to_vc4_dev(dev);
156 struct vc4_file *vc4file = file_priv->driver_priv;
157 struct drm_vc4_perfmon_destroy *req = data;
158 struct vc4_perfmon *perfmon;
159
160 if (!vc4->v3d) {
161 DRM_DEBUG("Destroying perfmon no VC4 V3D probed\n");
162 return -ENODEV;
163 }
164
165 mutex_lock(&vc4file->perfmon.lock);
166 perfmon = idr_remove(&vc4file->perfmon.idr, req->id);
167 mutex_unlock(&vc4file->perfmon.lock);
168
169 if (!perfmon)
170 return -EINVAL;
171
172 vc4_perfmon_put(perfmon);
173 return 0;
174 }
175
vc4_perfmon_get_values_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)176 int vc4_perfmon_get_values_ioctl(struct drm_device *dev, void *data,
177 struct drm_file *file_priv)
178 {
179 struct vc4_dev *vc4 = to_vc4_dev(dev);
180 struct vc4_file *vc4file = file_priv->driver_priv;
181 struct drm_vc4_perfmon_get_values *req = data;
182 struct vc4_perfmon *perfmon;
183 int ret;
184
185 if (!vc4->v3d) {
186 DRM_DEBUG("Getting perfmon no VC4 V3D probed\n");
187 return -ENODEV;
188 }
189
190 mutex_lock(&vc4file->perfmon.lock);
191 perfmon = idr_find(&vc4file->perfmon.idr, req->id);
192 vc4_perfmon_get(perfmon);
193 mutex_unlock(&vc4file->perfmon.lock);
194
195 if (!perfmon)
196 return -EINVAL;
197
198 if (copy_to_user(u64_to_user_ptr(req->values_ptr), perfmon->counters,
199 perfmon->ncounters * sizeof(u64)))
200 ret = -EFAULT;
201 else
202 ret = 0;
203
204 vc4_perfmon_put(perfmon);
205 return ret;
206 }
207