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
12void v3d_perfmon_get(struct v3d_perfmon *perfmon)
13{
14	if (perfmon)
15		refcount_inc(&perfmon->refcnt);
16}
17
18void v3d_perfmon_put(struct v3d_perfmon *perfmon)
19{
20	if (perfmon && refcount_dec_and_test(&perfmon->refcnt)) {
21		mutex_destroy(&perfmon->lock);
22		kfree(perfmon);
23	}
24}
25
26void v3d_perfmon_start(struct v3d_dev *v3d, struct v3d_perfmon *perfmon)
27{
28	unsigned int i;
29	u32 mask;
30	u8 ncounters;
31
32	if (WARN_ON_ONCE(!perfmon || v3d->active_perfmon))
33		return;
34
35	ncounters = perfmon->ncounters;
36	mask = GENMASK(ncounters - 1, 0);
37
38	for (i = 0; i < ncounters; i++) {
39		u32 source = i / 4;
40		u32 channel = V3D_SET_FIELD(perfmon->counters[i], V3D_PCTR_S0);
41
42		i++;
43		channel |= V3D_SET_FIELD(i < ncounters ? perfmon->counters[i] : 0,
44					 V3D_PCTR_S1);
45		i++;
46		channel |= V3D_SET_FIELD(i < ncounters ? perfmon->counters[i] : 0,
47					 V3D_PCTR_S2);
48		i++;
49		channel |= V3D_SET_FIELD(i < ncounters ? perfmon->counters[i] : 0,
50					 V3D_PCTR_S3);
51		V3D_CORE_WRITE(0, V3D_V4_PCTR_0_SRC_X(source), channel);
52	}
53
54	V3D_CORE_WRITE(0, V3D_V4_PCTR_0_CLR, mask);
55	V3D_CORE_WRITE(0, V3D_PCTR_0_OVERFLOW, mask);
56	V3D_CORE_WRITE(0, V3D_V4_PCTR_0_EN, mask);
57
58	v3d->active_perfmon = perfmon;
59}
60
61void v3d_perfmon_stop(struct v3d_dev *v3d, struct v3d_perfmon *perfmon,
62		      bool capture)
63{
64	unsigned int i;
65
66	if (!perfmon || !v3d->active_perfmon)
67		return;
68
69	mutex_lock(&perfmon->lock);
70	if (perfmon != v3d->active_perfmon) {
71		mutex_unlock(&perfmon->lock);
72		return;
73	}
74
75	if (capture)
76		for (i = 0; i < perfmon->ncounters; i++)
77			perfmon->values[i] += V3D_CORE_READ(0, V3D_PCTR_0_PCTRX(i));
78
79	V3D_CORE_WRITE(0, V3D_V4_PCTR_0_EN, 0);
80
81	v3d->active_perfmon = NULL;
82	mutex_unlock(&perfmon->lock);
83}
84
85struct v3d_perfmon *v3d_perfmon_find(struct v3d_file_priv *v3d_priv, int id)
86{
87	struct v3d_perfmon *perfmon;
88
89	mutex_lock(&v3d_priv->perfmon.lock);
90	perfmon = idr_find(&v3d_priv->perfmon.idr, id);
91	v3d_perfmon_get(perfmon);
92	mutex_unlock(&v3d_priv->perfmon.lock);
93
94	return perfmon;
95}
96
97void v3d_perfmon_open_file(struct v3d_file_priv *v3d_priv)
98{
99	mutex_init(&v3d_priv->perfmon.lock);
100	idr_init_base(&v3d_priv->perfmon.idr, 1);
101}
102
103static int v3d_perfmon_idr_del(int id, void *elem, void *data)
104{
105	struct v3d_perfmon *perfmon = elem;
106
107	v3d_perfmon_put(perfmon);
108
109	return 0;
110}
111
112void v3d_perfmon_close_file(struct v3d_file_priv *v3d_priv)
113{
114	mutex_lock(&v3d_priv->perfmon.lock);
115	idr_for_each(&v3d_priv->perfmon.idr, v3d_perfmon_idr_del, NULL);
116	idr_destroy(&v3d_priv->perfmon.idr);
117	mutex_unlock(&v3d_priv->perfmon.lock);
118	mutex_destroy(&v3d_priv->perfmon.lock);
119}
120
121int v3d_perfmon_create_ioctl(struct drm_device *dev, void *data,
122			     struct drm_file *file_priv)
123{
124	struct v3d_file_priv *v3d_priv = file_priv->driver_priv;
125	struct drm_v3d_perfmon_create *req = data;
126	struct v3d_perfmon *perfmon;
127	unsigned int i;
128	int ret;
129
130	/* Number of monitored counters cannot exceed HW limits. */
131	if (req->ncounters > DRM_V3D_MAX_PERF_COUNTERS ||
132	    !req->ncounters)
133		return -EINVAL;
134
135	/* Make sure all counters are valid. */
136	for (i = 0; i < req->ncounters; i++) {
137		if (req->counters[i] >= V3D_PERFCNT_NUM)
138			return -EINVAL;
139	}
140
141	perfmon = kzalloc(struct_size(perfmon, values, req->ncounters),
142			  GFP_KERNEL);
143	if (!perfmon)
144		return -ENOMEM;
145
146	for (i = 0; i < req->ncounters; i++)
147		perfmon->counters[i] = req->counters[i];
148
149	perfmon->ncounters = req->ncounters;
150
151	refcount_set(&perfmon->refcnt, 1);
152	mutex_init(&perfmon->lock);
153
154	mutex_lock(&v3d_priv->perfmon.lock);
155	ret = idr_alloc(&v3d_priv->perfmon.idr, perfmon, V3D_PERFMONID_MIN,
156			V3D_PERFMONID_MAX, GFP_KERNEL);
157	mutex_unlock(&v3d_priv->perfmon.lock);
158
159	if (ret < 0) {
160		mutex_destroy(&perfmon->lock);
161		kfree(perfmon);
162		return ret;
163	}
164
165	req->id = ret;
166
167	return 0;
168}
169
170int v3d_perfmon_destroy_ioctl(struct drm_device *dev, void *data,
171			      struct drm_file *file_priv)
172{
173	struct v3d_file_priv *v3d_priv = file_priv->driver_priv;
174	struct drm_v3d_perfmon_destroy *req = data;
175	struct v3d_perfmon *perfmon;
176
177	mutex_lock(&v3d_priv->perfmon.lock);
178	perfmon = idr_remove(&v3d_priv->perfmon.idr, req->id);
179	mutex_unlock(&v3d_priv->perfmon.lock);
180
181	if (!perfmon)
182		return -EINVAL;
183
184	v3d_perfmon_put(perfmon);
185
186	return 0;
187}
188
189int v3d_perfmon_get_values_ioctl(struct drm_device *dev, void *data,
190				 struct drm_file *file_priv)
191{
192	struct v3d_dev *v3d = to_v3d_dev(dev);
193	struct v3d_file_priv *v3d_priv = file_priv->driver_priv;
194	struct drm_v3d_perfmon_get_values *req = data;
195	struct v3d_perfmon *perfmon;
196	int ret = 0;
197
198	if (req->pad != 0)
199		return -EINVAL;
200
201	mutex_lock(&v3d_priv->perfmon.lock);
202	perfmon = idr_find(&v3d_priv->perfmon.idr, req->id);
203	v3d_perfmon_get(perfmon);
204	mutex_unlock(&v3d_priv->perfmon.lock);
205
206	if (!perfmon)
207		return -EINVAL;
208
209	v3d_perfmon_stop(v3d, perfmon, true);
210
211	if (copy_to_user(u64_to_user_ptr(req->values_ptr), perfmon->values,
212			 perfmon->ncounters * sizeof(u64)))
213		ret = -EFAULT;
214
215	v3d_perfmon_put(perfmon);
216
217	return ret;
218}
219