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26a4dc29 JSR |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) 2021 Raspberry Pi | |
4 | */ | |
5 | ||
6 | #include "v3d_drv.h" | |
7 | #include "v3d_regs.h" | |
8 | ||
9 | #define V3D_PERFMONID_MIN 1 | |
10 | #define V3D_PERFMONID_MAX U32_MAX | |
11 | ||
12 | void v3d_perfmon_get(struct v3d_perfmon *perfmon) | |
13 | { | |
14 | if (perfmon) | |
15 | refcount_inc(&perfmon->refcnt); | |
16 | } | |
17 | ||
18 | void v3d_perfmon_put(struct v3d_perfmon *perfmon) | |
19 | { | |
20 | if (perfmon && refcount_dec_and_test(&perfmon->refcnt)) | |
21 | kfree(perfmon); | |
22 | } | |
23 | ||
24 | void v3d_perfmon_start(struct v3d_dev *v3d, struct v3d_perfmon *perfmon) | |
25 | { | |
26 | unsigned int i; | |
27 | u32 mask; | |
28 | u8 ncounters = perfmon->ncounters; | |
29 | ||
30 | if (WARN_ON_ONCE(!perfmon || v3d->active_perfmon)) | |
31 | return; | |
32 | ||
33 | mask = GENMASK(ncounters - 1, 0); | |
34 | ||
35 | for (i = 0; i < ncounters; i++) { | |
36 | u32 source = i / 4; | |
37 | u32 channel = V3D_SET_FIELD(perfmon->counters[i], V3D_PCTR_S0); | |
38 | ||
39 | i++; | |
40 | channel |= V3D_SET_FIELD(i < ncounters ? perfmon->counters[i] : 0, | |
41 | V3D_PCTR_S1); | |
42 | i++; | |
43 | channel |= V3D_SET_FIELD(i < ncounters ? perfmon->counters[i] : 0, | |
44 | V3D_PCTR_S2); | |
45 | i++; | |
46 | channel |= V3D_SET_FIELD(i < ncounters ? perfmon->counters[i] : 0, | |
47 | V3D_PCTR_S3); | |
48 | V3D_CORE_WRITE(0, V3D_V4_PCTR_0_SRC_X(source), channel); | |
49 | } | |
50 | ||
51 | V3D_CORE_WRITE(0, V3D_V4_PCTR_0_CLR, mask); | |
52 | V3D_CORE_WRITE(0, V3D_PCTR_0_OVERFLOW, mask); | |
53 | V3D_CORE_WRITE(0, V3D_V4_PCTR_0_EN, mask); | |
54 | ||
55 | v3d->active_perfmon = perfmon; | |
56 | } | |
57 | ||
58 | void v3d_perfmon_stop(struct v3d_dev *v3d, struct v3d_perfmon *perfmon, | |
59 | bool capture) | |
60 | { | |
61 | unsigned int i; | |
62 | ||
63 | if (!perfmon || !v3d->active_perfmon) | |
64 | return; | |
65 | ||
66 | mutex_lock(&perfmon->lock); | |
67 | if (perfmon != v3d->active_perfmon) { | |
68 | mutex_unlock(&perfmon->lock); | |
69 | return; | |
70 | } | |
71 | ||
72 | if (capture) | |
73 | for (i = 0; i < perfmon->ncounters; i++) | |
74 | perfmon->values[i] += V3D_CORE_READ(0, V3D_PCTR_0_PCTRX(i)); | |
75 | ||
76 | V3D_CORE_WRITE(0, V3D_V4_PCTR_0_EN, 0); | |
77 | ||
78 | v3d->active_perfmon = NULL; | |
79 | mutex_unlock(&perfmon->lock); | |
80 | } | |
81 | ||
82 | struct v3d_perfmon *v3d_perfmon_find(struct v3d_file_priv *v3d_priv, int id) | |
83 | { | |
84 | struct v3d_perfmon *perfmon; | |
85 | ||
86 | mutex_lock(&v3d_priv->perfmon.lock); | |
87 | perfmon = idr_find(&v3d_priv->perfmon.idr, id); | |
88 | v3d_perfmon_get(perfmon); | |
89 | mutex_unlock(&v3d_priv->perfmon.lock); | |
90 | ||
91 | return perfmon; | |
92 | } | |
93 | ||
94 | void v3d_perfmon_open_file(struct v3d_file_priv *v3d_priv) | |
95 | { | |
96 | mutex_init(&v3d_priv->perfmon.lock); | |
97 | idr_init(&v3d_priv->perfmon.idr); | |
98 | } | |
99 | ||
100 | static int v3d_perfmon_idr_del(int id, void *elem, void *data) | |
101 | { | |
102 | struct v3d_perfmon *perfmon = elem; | |
103 | ||
104 | v3d_perfmon_put(perfmon); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | void v3d_perfmon_close_file(struct v3d_file_priv *v3d_priv) | |
110 | { | |
111 | mutex_lock(&v3d_priv->perfmon.lock); | |
112 | idr_for_each(&v3d_priv->perfmon.idr, v3d_perfmon_idr_del, NULL); | |
113 | idr_destroy(&v3d_priv->perfmon.idr); | |
114 | mutex_unlock(&v3d_priv->perfmon.lock); | |
115 | } | |
116 | ||
117 | int v3d_perfmon_create_ioctl(struct drm_device *dev, void *data, | |
118 | struct drm_file *file_priv) | |
119 | { | |
120 | struct v3d_file_priv *v3d_priv = file_priv->driver_priv; | |
121 | struct drm_v3d_perfmon_create *req = data; | |
122 | struct v3d_perfmon *perfmon; | |
123 | unsigned int i; | |
124 | int ret; | |
125 | ||
126 | /* Number of monitored counters cannot exceed HW limits. */ | |
127 | if (req->ncounters > DRM_V3D_MAX_PERF_COUNTERS || | |
128 | !req->ncounters) | |
129 | return -EINVAL; | |
130 | ||
131 | /* Make sure all counters are valid. */ | |
132 | for (i = 0; i < req->ncounters; i++) { | |
133 | if (req->counters[i] >= V3D_PERFCNT_NUM) | |
134 | return -EINVAL; | |
135 | } | |
136 | ||
137 | perfmon = kzalloc(struct_size(perfmon, values, req->ncounters), | |
138 | GFP_KERNEL); | |
139 | if (!perfmon) | |
140 | return -ENOMEM; | |
141 | ||
142 | for (i = 0; i < req->ncounters; i++) | |
143 | perfmon->counters[i] = req->counters[i]; | |
144 | ||
145 | perfmon->ncounters = req->ncounters; | |
146 | ||
147 | refcount_set(&perfmon->refcnt, 1); | |
148 | mutex_init(&perfmon->lock); | |
149 | ||
150 | mutex_lock(&v3d_priv->perfmon.lock); | |
151 | ret = idr_alloc(&v3d_priv->perfmon.idr, perfmon, V3D_PERFMONID_MIN, | |
152 | V3D_PERFMONID_MAX, GFP_KERNEL); | |
153 | mutex_unlock(&v3d_priv->perfmon.lock); | |
154 | ||
155 | if (ret < 0) { | |
156 | kfree(perfmon); | |
157 | return ret; | |
158 | } | |
159 | ||
160 | req->id = ret; | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | int v3d_perfmon_destroy_ioctl(struct drm_device *dev, void *data, | |
166 | struct drm_file *file_priv) | |
167 | { | |
168 | struct v3d_file_priv *v3d_priv = file_priv->driver_priv; | |
169 | struct drm_v3d_perfmon_destroy *req = data; | |
170 | struct v3d_perfmon *perfmon; | |
171 | ||
172 | mutex_lock(&v3d_priv->perfmon.lock); | |
173 | perfmon = idr_remove(&v3d_priv->perfmon.idr, req->id); | |
174 | mutex_unlock(&v3d_priv->perfmon.lock); | |
175 | ||
176 | if (!perfmon) | |
177 | return -EINVAL; | |
178 | ||
179 | v3d_perfmon_put(perfmon); | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | int v3d_perfmon_get_values_ioctl(struct drm_device *dev, void *data, | |
185 | struct drm_file *file_priv) | |
186 | { | |
187 | struct v3d_dev *v3d = to_v3d_dev(dev); | |
188 | struct v3d_file_priv *v3d_priv = file_priv->driver_priv; | |
189 | struct drm_v3d_perfmon_get_values *req = data; | |
190 | struct v3d_perfmon *perfmon; | |
191 | int ret = 0; | |
192 | ||
193 | if (req->pad != 0) | |
194 | return -EINVAL; | |
195 | ||
196 | mutex_lock(&v3d_priv->perfmon.lock); | |
197 | perfmon = idr_find(&v3d_priv->perfmon.idr, req->id); | |
198 | v3d_perfmon_get(perfmon); | |
199 | mutex_unlock(&v3d_priv->perfmon.lock); | |
200 | ||
201 | if (!perfmon) | |
202 | return -EINVAL; | |
203 | ||
204 | v3d_perfmon_stop(v3d, perfmon, true); | |
205 | ||
206 | if (copy_to_user(u64_to_user_ptr(req->values_ptr), perfmon->values, | |
207 | perfmon->ncounters * sizeof(u64))) | |
208 | ret = -EFAULT; | |
209 | ||
210 | v3d_perfmon_put(perfmon); | |
211 | ||
212 | return ret; | |
213 | } |