1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2010 Google, Inc.
  4 * Author: Erik Gilling <konkers@android.com>
  5 *
  6 * Copyright (C) 2011-2013 NVIDIA Corporation
  7 */
  8
  9#include <linux/debugfs.h>
 10#include <linux/pm_runtime.h>
 11#include <linux/seq_file.h>
 12#include <linux/uaccess.h>
 13
 14#include <linux/io.h>
 15
 16#include "dev.h"
 17#include "debug.h"
 18#include "channel.h"
 19
 20static DEFINE_MUTEX(debug_lock);
 21
 22unsigned int host1x_debug_trace_cmdbuf;
 23
 24static pid_t host1x_debug_force_timeout_pid;
 25static u32 host1x_debug_force_timeout_val;
 26static u32 host1x_debug_force_timeout_channel;
 27
 28void host1x_debug_output(struct output *o, const char *fmt, ...)
 29{
 30	va_list args;
 31	int len;
 32
 33	va_start(args, fmt);
 34	len = vsnprintf(o->buf, sizeof(o->buf), fmt, args);
 35	va_end(args);
 36
 37	o->fn(o->ctx, o->buf, len, false);
 38}
 39
 40void host1x_debug_cont(struct output *o, const char *fmt, ...)
 41{
 42	va_list args;
 43	int len;
 44
 45	va_start(args, fmt);
 46	len = vsnprintf(o->buf, sizeof(o->buf), fmt, args);
 47	va_end(args);
 48
 49	o->fn(o->ctx, o->buf, len, true);
 50}
 51
 52static int show_channel(struct host1x_channel *ch, void *data, bool show_fifo)
 53{
 54	struct host1x *m = dev_get_drvdata(ch->dev->parent);
 55	struct output *o = data;
 56	int err;
 57
 58	err = pm_runtime_resume_and_get(m->dev);
 59	if (err < 0)
 60		return err;
 61
 62	mutex_lock(&ch->cdma.lock);
 63	mutex_lock(&debug_lock);
 64
 65	if (show_fifo)
 66		host1x_hw_show_channel_fifo(m, ch, o);
 67
 68	host1x_hw_show_channel_cdma(m, ch, o);
 69
 70	mutex_unlock(&debug_lock);
 71	mutex_unlock(&ch->cdma.lock);
 72
 73	pm_runtime_put(m->dev);
 74
 75	return 0;
 76}
 77
 78static void show_syncpts(struct host1x *m, struct output *o, bool show_all)
 79{
 80	struct list_head *pos;
 81	unsigned int i;
 82	int err;
 83
 84	host1x_debug_output(o, "---- syncpts ----\n");
 85
 86	err = pm_runtime_resume_and_get(m->dev);
 87	if (err < 0)
 88		return;
 89
 90	for (i = 0; i < host1x_syncpt_nb_pts(m); i++) {
 91		u32 max = host1x_syncpt_read_max(m->syncpt + i);
 92		u32 min = host1x_syncpt_load(m->syncpt + i);
 93		unsigned int waiters = 0;
 94
 95		spin_lock(&m->syncpt[i].intr.lock);
 96		list_for_each(pos, &m->syncpt[i].intr.wait_head)
 97			waiters++;
 98		spin_unlock(&m->syncpt[i].intr.lock);
 99
100		if (!kref_read(&m->syncpt[i].ref))
101			continue;
102
103		if (!show_all && !min && !max && !waiters)
104			continue;
105
106		host1x_debug_output(o,
107				    "id %u (%s) min %d max %d (%d waiters)\n",
108				    i, m->syncpt[i].name, min, max, waiters);
109	}
110
111	for (i = 0; i < host1x_syncpt_nb_bases(m); i++) {
112		u32 base_val;
113
114		base_val = host1x_syncpt_load_wait_base(m->syncpt + i);
115		if (base_val)
116			host1x_debug_output(o, "waitbase id %u val %d\n", i,
117					    base_val);
118	}
119
120	pm_runtime_put(m->dev);
121
122	host1x_debug_output(o, "\n");
123}
124
125static void show_all(struct host1x *m, struct output *o, bool show_fifo)
126{
127	unsigned int i;
128
129	host1x_hw_show_mlocks(m, o);
130	show_syncpts(m, o, true);
131	host1x_debug_output(o, "---- channels ----\n");
132
133	for (i = 0; i < m->info->nb_channels; ++i) {
134		struct host1x_channel *ch = host1x_channel_get_index(m, i);
135
136		if (ch) {
137			show_channel(ch, o, show_fifo);
138			host1x_channel_put(ch);
139		}
140	}
141}
142
143static int host1x_debug_all_show(struct seq_file *s, void *unused)
144{
145	struct output o = {
146		.fn = write_to_seqfile,
147		.ctx = s
148	};
149
150	show_all(s->private, &o, true);
151
152	return 0;
153}
154DEFINE_SHOW_ATTRIBUTE(host1x_debug_all);
155
156static int host1x_debug_show(struct seq_file *s, void *unused)
157{
158	struct output o = {
159		.fn = write_to_seqfile,
160		.ctx = s
161	};
162
163	show_all(s->private, &o, false);
164
165	return 0;
166}
167DEFINE_SHOW_ATTRIBUTE(host1x_debug);
168
169static void host1x_debugfs_init(struct host1x *host1x)
170{
171	struct dentry *de = debugfs_create_dir("tegra-host1x", NULL);
172
173	/* Store the created entry */
174	host1x->debugfs = de;
175
176	debugfs_create_file("status", S_IRUGO, de, host1x, &host1x_debug_fops);
177	debugfs_create_file("status_all", S_IRUGO, de, host1x,
178			    &host1x_debug_all_fops);
179
180	debugfs_create_u32("trace_cmdbuf", S_IRUGO|S_IWUSR, de,
181			   &host1x_debug_trace_cmdbuf);
182
183	host1x_hw_debug_init(host1x, de);
184
185	debugfs_create_u32("force_timeout_pid", S_IRUGO|S_IWUSR, de,
186			   &host1x_debug_force_timeout_pid);
187	debugfs_create_u32("force_timeout_val", S_IRUGO|S_IWUSR, de,
188			   &host1x_debug_force_timeout_val);
189	debugfs_create_u32("force_timeout_channel", S_IRUGO|S_IWUSR, de,
190			   &host1x_debug_force_timeout_channel);
191}
192
193static void host1x_debugfs_exit(struct host1x *host1x)
194{
195	debugfs_remove_recursive(host1x->debugfs);
196}
197
198void host1x_debug_init(struct host1x *host1x)
199{
200	if (IS_ENABLED(CONFIG_DEBUG_FS))
201		host1x_debugfs_init(host1x);
202}
203
204void host1x_debug_deinit(struct host1x *host1x)
205{
206	if (IS_ENABLED(CONFIG_DEBUG_FS))
207		host1x_debugfs_exit(host1x);
208}
209
210void host1x_debug_dump(struct host1x *host1x)
211{
212	struct output o = {
213		.fn = write_to_printk
214	};
215
216	show_all(host1x, &o, true);
217}
218
219void host1x_debug_dump_syncpts(struct host1x *host1x)
220{
221	struct output o = {
222		.fn = write_to_printk
223	};
224
225	show_syncpts(host1x, &o, false);
226}