drivers/gpu/host1x/debug.c

   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
  20 static DEFINE_MUTEX(debug_lock);
  21
  22 unsigned int host1x_debug_trace_cmdbuf;
  23
  24 static pid_t host1x_debug_force_timeout_pid;
  25 static u32 host1x_debug_force_timeout_val;
  26 static u32 host1x_debug_force_timeout_channel;
  27
  28 void 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
  40 void 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
  52 static 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
  78 static 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
 125 static 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
 143 static int host1x_debug_show_all(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 }
 154
 155 static int host1x_debug_show(struct seq_file *s, void *unused)
 156 {
 157         struct output o = {
 158                 .fn = write_to_seqfile,
 159                 .ctx = s
 160         };
 161
 162         show_all(s->private, &o, false);
 163
 164         return 0;
 165 }
 166
 167 static int host1x_debug_open_all(struct inode *inode, struct file *file)
 168 {
 169         return single_open(file, host1x_debug_show_all, inode->i_private);
 170 }
 171
 172 static const struct file_operations host1x_debug_all_fops = {
 173         .open = host1x_debug_open_all,
 174         .read = seq_read,
 175         .llseek = seq_lseek,
 176         .release = single_release,
 177 };
 178
 179 static int host1x_debug_open(struct inode *inode, struct file *file)
 180 {
 181         return single_open(file, host1x_debug_show, inode->i_private);
 182 }
 183
 184 static const struct file_operations host1x_debug_fops = {
 185         .open = host1x_debug_open,
 186         .read = seq_read,
 187         .llseek = seq_lseek,
 188         .release = single_release,
 189 };
 190
 191 static void host1x_debugfs_init(struct host1x *host1x)
 192 {
 193         struct dentry *de = debugfs_create_dir("tegra-host1x", NULL);
 194
 195         /* Store the created entry */
 196         host1x->debugfs = de;
 197
 198         debugfs_create_file("status", S_IRUGO, de, host1x, &host1x_debug_fops);
 199         debugfs_create_file("status_all", S_IRUGO, de, host1x,
 200                             &host1x_debug_all_fops);
 201
 202         debugfs_create_u32("trace_cmdbuf", S_IRUGO|S_IWUSR, de,
 203                            &host1x_debug_trace_cmdbuf);
 204
 205         host1x_hw_debug_init(host1x, de);
 206
 207         debugfs_create_u32("force_timeout_pid", S_IRUGO|S_IWUSR, de,
 208                            &host1x_debug_force_timeout_pid);
 209         debugfs_create_u32("force_timeout_val", S_IRUGO|S_IWUSR, de,
 210                            &host1x_debug_force_timeout_val);
 211         debugfs_create_u32("force_timeout_channel", S_IRUGO|S_IWUSR, de,
 212                            &host1x_debug_force_timeout_channel);
 213 }
 214
 215 static void host1x_debugfs_exit(struct host1x *host1x)
 216 {
 217         debugfs_remove_recursive(host1x->debugfs);
 218 }
 219
 220 void host1x_debug_init(struct host1x *host1x)
 221 {
 222         if (IS_ENABLED(CONFIG_DEBUG_FS))
 223                 host1x_debugfs_init(host1x);
 224 }
 225
 226 void host1x_debug_deinit(struct host1x *host1x)
 227 {
 228         if (IS_ENABLED(CONFIG_DEBUG_FS))
 229                 host1x_debugfs_exit(host1x);
 230 }
 231
 232 void host1x_debug_dump(struct host1x *host1x)
 233 {
 234         struct output o = {
 235                 .fn = write_to_printk
 236         };
 237
 238         show_all(host1x, &o, true);
 239 }
 240
 241 void host1x_debug_dump_syncpts(struct host1x *host1x)
 242 {
 243         struct output o = {
 244                 .fn = write_to_printk
 245         };
 246
 247         show_syncpts(host1x, &o, false);
 248 }