Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 | /*
* Copyright (C) 2007 IBM Deutschland Entwicklung GmbH
* Released under GPL v2.
*
* Partially based on net/ipv4/tcp_probe.c.
*
* Simple tracing facility for spu contexts.
*/
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/marker.h>
#include <linux/proc_fs.h>
#include <linux/wait.h>
#include <asm/atomic.h>
#include <asm/uaccess.h>
#include "spufs.h"
struct spu_probe {
const char *name;
const char *format;
marker_probe_func *probe_func;
};
struct sputrace {
ktime_t tstamp;
int owner_tid; /* owner */
int curr_tid;
const char *name;
int number;
};
static int bufsize __read_mostly = 16384;
MODULE_PARM_DESC(bufsize, "Log buffer size (number of records)");
module_param(bufsize, int, 0);
static DEFINE_SPINLOCK(sputrace_lock);
static DECLARE_WAIT_QUEUE_HEAD(sputrace_wait);
static ktime_t sputrace_start;
static unsigned long sputrace_head, sputrace_tail;
static struct sputrace *sputrace_log;
static int sputrace_logging;
static int sputrace_used(void)
{
return (sputrace_head - sputrace_tail) % bufsize;
}
static inline int sputrace_avail(void)
{
return bufsize - sputrace_used();
}
static int sputrace_sprint(char *tbuf, int n)
{
const struct sputrace *t = sputrace_log + sputrace_tail % bufsize;
struct timespec tv =
ktime_to_timespec(ktime_sub(t->tstamp, sputrace_start));
return snprintf(tbuf, n,
"[%lu.%09lu] %d: %s (ctxthread = %d, spu = %d)\n",
(unsigned long) tv.tv_sec,
(unsigned long) tv.tv_nsec,
t->curr_tid,
t->name,
t->owner_tid,
t->number);
}
static ssize_t sputrace_read(struct file *file, char __user *buf,
size_t len, loff_t *ppos)
{
int error = 0, cnt = 0;
if (!buf || len < 0)
return -EINVAL;
while (cnt < len) {
char tbuf[128];
int width;
/* If we have data ready to return, don't block waiting
* for more */
if (cnt > 0 && sputrace_used() == 0)
break;
error = wait_event_interruptible(sputrace_wait,
sputrace_used() > 0);
if (error)
break;
spin_lock(&sputrace_lock);
if (sputrace_head == sputrace_tail) {
spin_unlock(&sputrace_lock);
continue;
}
width = sputrace_sprint(tbuf, sizeof(tbuf));
if (width < len)
sputrace_tail = (sputrace_tail + 1) % bufsize;
spin_unlock(&sputrace_lock);
if (width >= len)
break;
error = copy_to_user(buf + cnt, tbuf, width);
if (error)
break;
cnt += width;
}
return cnt == 0 ? error : cnt;
}
static int sputrace_open(struct inode *inode, struct file *file)
{
int rc;
spin_lock(&sputrace_lock);
if (sputrace_logging) {
rc = -EBUSY;
goto out;
}
sputrace_logging = 1;
sputrace_head = sputrace_tail = 0;
sputrace_start = ktime_get();
rc = 0;
out:
spin_unlock(&sputrace_lock);
return rc;
}
static int sputrace_release(struct inode *inode, struct file *file)
{
spin_lock(&sputrace_lock);
sputrace_logging = 0;
spin_unlock(&sputrace_lock);
return 0;
}
static const struct file_operations sputrace_fops = {
.owner = THIS_MODULE,
.open = sputrace_open,
.read = sputrace_read,
.release = sputrace_release,
};
static void sputrace_log_item(const char *name, struct spu_context *ctx,
struct spu *spu)
{
spin_lock(&sputrace_lock);
if (!sputrace_logging) {
spin_unlock(&sputrace_lock);
return;
}
if (sputrace_avail() > 1) {
struct sputrace *t = sputrace_log + sputrace_head;
t->tstamp = ktime_get();
t->owner_tid = ctx->tid;
t->name = name;
t->curr_tid = current->pid;
t->number = spu ? spu->number : -1;
sputrace_head = (sputrace_head + 1) % bufsize;
} else {
printk(KERN_WARNING
"sputrace: lost samples due to full buffer.\n");
}
spin_unlock(&sputrace_lock);
wake_up(&sputrace_wait);
}
static void spu_context_event(void *probe_private, void *call_data,
const char *format, va_list *args)
{
struct spu_probe *p = probe_private;
struct spu_context *ctx;
struct spu *spu;
ctx = va_arg(*args, struct spu_context *);
spu = va_arg(*args, struct spu *);
sputrace_log_item(p->name, ctx, spu);
}
static void spu_context_nospu_event(void *probe_private, void *call_data,
const char *format, va_list *args)
{
struct spu_probe *p = probe_private;
struct spu_context *ctx;
ctx = va_arg(*args, struct spu_context *);
sputrace_log_item(p->name, ctx, NULL);
}
struct spu_probe spu_probes[] = {
{ "spu_bind_context__enter", "ctx %p spu %p", spu_context_event },
{ "spu_unbind_context__enter", "ctx %p spu %p", spu_context_event },
{ "spu_get_idle__enter", "ctx %p", spu_context_nospu_event },
{ "spu_get_idle__found", "ctx %p spu %p", spu_context_event },
{ "spu_get_idle__not_found", "ctx %p", spu_context_nospu_event },
{ "spu_find_victim__enter", "ctx %p", spu_context_nospu_event },
{ "spusched_tick__preempt", "ctx %p spu %p", spu_context_event },
{ "spusched_tick__newslice", "ctx %p", spu_context_nospu_event },
{ "spu_yield__enter", "ctx %p", spu_context_nospu_event },
{ "spu_deactivate__enter", "ctx %p", spu_context_nospu_event },
{ "__spu_deactivate__unload", "ctx %p spu %p", spu_context_event },
{ "spufs_ps_fault__enter", "ctx %p", spu_context_nospu_event },
{ "spufs_ps_fault__sleep", "ctx %p", spu_context_nospu_event },
{ "spufs_ps_fault__wake", "ctx %p spu %p", spu_context_event },
{ "spufs_ps_fault__insert", "ctx %p spu %p", spu_context_event },
{ "spu_acquire_saved__enter", "ctx %p", spu_context_nospu_event },
{ "destroy_spu_context__enter", "ctx %p", spu_context_nospu_event },
{ "spufs_stop_callback__enter", "ctx %p spu %p", spu_context_event },
};
static int __init sputrace_init(void)
{
struct proc_dir_entry *entry;
int i, error = -ENOMEM;
sputrace_log = kcalloc(bufsize, sizeof(struct sputrace), GFP_KERNEL);
if (!sputrace_log)
goto out;
entry = proc_create("sputrace", S_IRUSR, NULL, &sputrace_fops);
if (!entry)
goto out_free_log;
for (i = 0; i < ARRAY_SIZE(spu_probes); i++) {
struct spu_probe *p = &spu_probes[i];
error = marker_probe_register(p->name, p->format,
p->probe_func, p);
if (error)
printk(KERN_INFO "Unable to register probe %s\n",
p->name);
}
return 0;
out_free_log:
kfree(sputrace_log);
out:
return -ENOMEM;
}
static void __exit sputrace_exit(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(spu_probes); i++)
marker_probe_unregister(spu_probes[i].name,
spu_probes[i].probe_func, &spu_probes[i]);
remove_proc_entry("sputrace", NULL);
kfree(sputrace_log);
marker_synchronize_unregister();
}
module_init(sputrace_init);
module_exit(sputrace_exit);
MODULE_LICENSE("GPL");
|