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
 18void 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
 32void 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
 47void 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
 67void 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
 88struct 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
104void 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
116static int vc4_perfmon_idr_del(int id, void *elem, void *data)
117{
118	struct vc4_perfmon *perfmon = elem;
119
120	vc4_perfmon_put(perfmon);
121
122	return 0;
123}
124
125void vc4_perfmon_close_file(struct vc4_file *vc4file)
126{
127	struct vc4_dev *vc4 = vc4file->dev;
128
129	if (WARN_ON_ONCE(vc4->is_vc5))
130		return;
131
132	mutex_lock(&vc4file->perfmon.lock);
133	idr_for_each(&vc4file->perfmon.idr, vc4_perfmon_idr_del, NULL);
134	idr_destroy(&vc4file->perfmon.idr);
135	mutex_unlock(&vc4file->perfmon.lock);
136	mutex_destroy(&vc4file->perfmon.lock);
137}
138
139int vc4_perfmon_create_ioctl(struct drm_device *dev, void *data,
140			     struct drm_file *file_priv)
141{
142	struct vc4_dev *vc4 = to_vc4_dev(dev);
143	struct vc4_file *vc4file = file_priv->driver_priv;
144	struct drm_vc4_perfmon_create *req = data;
145	struct vc4_perfmon *perfmon;
146	unsigned int i;
147	int ret;
148
149	if (WARN_ON_ONCE(vc4->is_vc5))
150		return -ENODEV;
151
152	if (!vc4->v3d) {
153		DRM_DEBUG("Creating perfmon no VC4 V3D probed\n");
154		return -ENODEV;
155	}
156
157	/* Number of monitored counters cannot exceed HW limits. */
158	if (req->ncounters > DRM_VC4_MAX_PERF_COUNTERS ||
159	    !req->ncounters)
160		return -EINVAL;
161
162	/* Make sure all events are valid. */
163	for (i = 0; i < req->ncounters; i++) {
164		if (req->events[i] >= VC4_PERFCNT_NUM_EVENTS)
165			return -EINVAL;
166	}
167
168	perfmon = kzalloc(struct_size(perfmon, counters, req->ncounters),
169			  GFP_KERNEL);
170	if (!perfmon)
171		return -ENOMEM;
172	perfmon->dev = vc4;
173
174	for (i = 0; i < req->ncounters; i++)
175		perfmon->events[i] = req->events[i];
176
177	perfmon->ncounters = req->ncounters;
178
179	refcount_set(&perfmon->refcnt, 1);
180
181	mutex_lock(&vc4file->perfmon.lock);
182	ret = idr_alloc(&vc4file->perfmon.idr, perfmon, VC4_PERFMONID_MIN,
183			VC4_PERFMONID_MAX, GFP_KERNEL);
184	mutex_unlock(&vc4file->perfmon.lock);
185
186	if (ret < 0) {
187		kfree(perfmon);
188		return ret;
189	}
190
191	req->id = ret;
192	return 0;
193}
194
195int vc4_perfmon_destroy_ioctl(struct drm_device *dev, void *data,
196			      struct drm_file *file_priv)
197{
198	struct vc4_dev *vc4 = to_vc4_dev(dev);
199	struct vc4_file *vc4file = file_priv->driver_priv;
200	struct drm_vc4_perfmon_destroy *req = data;
201	struct vc4_perfmon *perfmon;
202
203	if (WARN_ON_ONCE(vc4->is_vc5))
204		return -ENODEV;
205
206	if (!vc4->v3d) {
207		DRM_DEBUG("Destroying perfmon no VC4 V3D probed\n");
208		return -ENODEV;
209	}
210
211	mutex_lock(&vc4file->perfmon.lock);
212	perfmon = idr_remove(&vc4file->perfmon.idr, req->id);
213	mutex_unlock(&vc4file->perfmon.lock);
214
215	if (!perfmon)
216		return -EINVAL;
217
218	vc4_perfmon_put(perfmon);
219	return 0;
220}
221
222int vc4_perfmon_get_values_ioctl(struct drm_device *dev, void *data,
223				 struct drm_file *file_priv)
224{
225	struct vc4_dev *vc4 = to_vc4_dev(dev);
226	struct vc4_file *vc4file = file_priv->driver_priv;
227	struct drm_vc4_perfmon_get_values *req = data;
228	struct vc4_perfmon *perfmon;
229	int ret;
230
231	if (WARN_ON_ONCE(vc4->is_vc5))
232		return -ENODEV;
233
234	if (!vc4->v3d) {
235		DRM_DEBUG("Getting perfmon no VC4 V3D probed\n");
236		return -ENODEV;
237	}
238
239	mutex_lock(&vc4file->perfmon.lock);
240	perfmon = idr_find(&vc4file->perfmon.idr, req->id);
241	vc4_perfmon_get(perfmon);
242	mutex_unlock(&vc4file->perfmon.lock);
243
244	if (!perfmon)
245		return -EINVAL;
246
247	if (copy_to_user(u64_to_user_ptr(req->values_ptr), perfmon->counters,
248			 perfmon->ncounters * sizeof(u64)))
249		ret = -EFAULT;
250	else
251		ret = 0;
252
253	vc4_perfmon_put(perfmon);
254	return ret;
255}