134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
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/* arch/arm/mach-msm/qdsp5/evlog.h
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*
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* simple event log debugging facility
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*
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* Copyright (C) 2008 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/fs.h>
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#include <linux/hrtimer.h>
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#include <linux/debugfs.h>
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#define EV_LOG_ENTRY_NAME(n) n##_entry
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#define DECLARE_LOG(_name, _size, _str) \
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static struct ev_entry EV_LOG_ENTRY_NAME(_name)[_size]; \
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static struct ev_log _name = { \
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.name = #_name, \
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.strings = _str, \
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.num_strings = ARRAY_SIZE(_str), \
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.entry = EV_LOG_ENTRY_NAME(_name), \
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.max = ARRAY_SIZE(EV_LOG_ENTRY_NAME(_name)), \
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}
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struct ev_entry {
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ktime_t when;
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uint32_t id;
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uint32_t arg;
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};
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struct ev_log {
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struct ev_entry *entry;
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unsigned max;
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unsigned next;
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unsigned fault;
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const char **strings;
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unsigned num_strings;
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const char *name;
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};
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static char ev_buf[4096];
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static ssize_t ev_log_read(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct ev_log *log = file->private_data;
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struct ev_entry *entry;
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unsigned long flags;
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int size = 0;
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unsigned n, id, max;
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ktime_t now, t;
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max = log->max;
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now = ktime_get();
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local_irq_save(flags);
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n = (log->next - 1) & (max - 1);
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entry = log->entry;
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while (n != log->next) {
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t = ktime_sub(now, entry[n].when);
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id = entry[n].id;
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if (id) {
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const char *str;
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if (id < log->num_strings)
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str = log->strings[id];
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else
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str = "UNKNOWN";
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size += scnprintf(ev_buf + size, 4096 - size,
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"%8d.%03d %08x %s\n",
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t.tv.sec, t.tv.nsec / 1000000,
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entry[n].arg, str);
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}
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n = (n - 1) & (max - 1);
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}
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log->fault = 0;
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local_irq_restore(flags);
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return simple_read_from_buffer(buf, count, ppos, ev_buf, size);
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}
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static void ev_log_write(struct ev_log *log, unsigned id, unsigned arg)
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{
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struct ev_entry *entry;
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unsigned long flags;
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local_irq_save(flags);
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if (log->fault) {
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if (log->fault == 1)
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goto done;
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log->fault--;
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}
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entry = log->entry + log->next;
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entry->when = ktime_get();
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entry->id = id;
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entry->arg = arg;
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log->next = (log->next + 1) & (log->max - 1);
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done:
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local_irq_restore(flags);
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}
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static void ev_log_freeze(struct ev_log *log, unsigned count)
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{
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unsigned long flags;
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local_irq_save(flags);
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log->fault = count;
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local_irq_restore(flags);
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}
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static int ev_log_open(struct inode *inode, struct file *file)
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{
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file->private_data = inode->i_private;
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return 0;
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}
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static const struct file_operations ev_log_ops = {
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.read = ev_log_read,
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.open = ev_log_open,
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};
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static int ev_log_init(struct ev_log *log)
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{
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debugfs_create_file(log->name, 0444, 0, log, &ev_log_ops);
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return 0;
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}
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