+++ /dev/null
-/*
- * 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");
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff