drivers/gpu/host1x/debug.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2010 Google, Inc.
   4  * Author: Erik Gilling <[email protected]>
   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)
  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 (!min && !max && !waiters)
 101                         continue;
 102
 103                 host1x_debug_output(o,
 104                                     "id %u (%s) min %d max %d (%d waiters)\n",
 105                                     i, m->syncpt[i].name, min, max, waiters);
 106         }
 107
 108         for (i = 0; i < host1x_syncpt_nb_bases(m); i++) {
 109                 u32 base_val;
 110
 111                 base_val = host1x_syncpt_load_wait_base(m->syncpt + i);
 112                 if (base_val)
 113                         host1x_debug_output(o, "waitbase id %u val %d\n", i,
 114                                             base_val);
 115         }
 116
 117         pm_runtime_put(m->dev);
 118
 119         host1x_debug_output(o, "\n");
 120 }
 121
 122 static void show_all(struct host1x *m, struct output *o, bool show_fifo)
 123 {
 124         unsigned int i;
 125
 126         host1x_hw_show_mlocks(m, o);
 127         show_syncpts(m, o);
 128         host1x_debug_output(o, "---- channels ----\n");
 129
 130         for (i = 0; i < m->info->nb_channels; ++i) {
 131                 struct host1x_channel *ch = host1x_channel_get_index(m, i);
 132
 133                 if (ch) {
 134                         show_channel(ch, o, show_fifo);
 135                         host1x_channel_put(ch);
 136                 }
 137         }
 138 }
 139
 140 static int host1x_debug_show_all(struct seq_file *s, void *unused)
 141 {
 142         struct output o = {
 143                 .fn = write_to_seqfile,
 144                 .ctx = s
 145         };
 146
 147         show_all(s->private, &o, true);
 148
 149         return 0;
 150 }
 151
 152 static int host1x_debug_show(struct seq_file *s, void *unused)
 153 {
 154         struct output o = {
 155                 .fn = write_to_seqfile,
 156                 .ctx = s
 157         };
 158
 159         show_all(s->private, &o, false);
 160
 161         return 0;
 162 }
 163
 164 static int host1x_debug_open_all(struct inode *inode, struct file *file)
 165 {
 166         return single_open(file, host1x_debug_show_all, inode->i_private);
 167 }
 168
 169 static const struct file_operations host1x_debug_all_fops = {
 170         .open = host1x_debug_open_all,
 171         .read = seq_read,
 172         .llseek = seq_lseek,
 173         .release = single_release,
 174 };
 175
 176 static int host1x_debug_open(struct inode *inode, struct file *file)
 177 {
 178         return single_open(file, host1x_debug_show, inode->i_private);
 179 }
 180
 181 static const struct file_operations host1x_debug_fops = {
 182         .open = host1x_debug_open,
 183         .read = seq_read,
 184         .llseek = seq_lseek,
 185         .release = single_release,
 186 };
 187
 188 static void host1x_debugfs_init(struct host1x *host1x)
 189 {
 190         struct dentry *de = debugfs_create_dir("tegra-host1x", NULL);
 191
 192         /* Store the created entry */
 193         host1x->debugfs = de;
 194
 195         debugfs_create_file("status", S_IRUGO, de, host1x, &host1x_debug_fops);
 196         debugfs_create_file("status_all", S_IRUGO, de, host1x,
 197                             &host1x_debug_all_fops);
 198
 199         debugfs_create_u32("trace_cmdbuf", S_IRUGO|S_IWUSR, de,
 200                            &host1x_debug_trace_cmdbuf);
 201
 202         host1x_hw_debug_init(host1x, de);
 203
 204         debugfs_create_u32("force_timeout_pid", S_IRUGO|S_IWUSR, de,
 205                            &host1x_debug_force_timeout_pid);
 206         debugfs_create_u32("force_timeout_val", S_IRUGO|S_IWUSR, de,
 207                            &host1x_debug_force_timeout_val);
 208         debugfs_create_u32("force_timeout_channel", S_IRUGO|S_IWUSR, de,
 209                            &host1x_debug_force_timeout_channel);
 210 }
 211
 212 static void host1x_debugfs_exit(struct host1x *host1x)
 213 {
 214         debugfs_remove_recursive(host1x->debugfs);
 215 }
 216
 217 void host1x_debug_init(struct host1x *host1x)
 218 {
 219         if (IS_ENABLED(CONFIG_DEBUG_FS))
 220                 host1x_debugfs_init(host1x);
 221 }
 222
 223 void host1x_debug_deinit(struct host1x *host1x)
 224 {
 225         if (IS_ENABLED(CONFIG_DEBUG_FS))
 226                 host1x_debugfs_exit(host1x);
 227 }
 228
 229 void host1x_debug_dump(struct host1x *host1x)
 230 {
 231         struct output o = {
 232                 .fn = write_to_printk
 233         };
 234
 235         show_all(host1x, &o, true);
 236 }
 237
 238 void host1x_debug_dump_syncpts(struct host1x *host1x)
 239 {
 240         struct output o = {
 241                 .fn = write_to_printk
 242         };
 243
 244         show_syncpts(host1x, &o);
 245 }