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powerpc/spufs: sputrace: Only enable logging on open(), prevent multiple openers

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Currently, sputrace will start logging to the event buffer before the
log buffer has been open()ed. This results in a heap of "lost samples"
warnings if the sputrace file hasn't yet been opened.

Since the buffer is reset on open() anyway, there's no need to enable
logging when no-one has opened the log.

Because open clears the log, make it return EBUSY for mutliple open
calls.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
This commit is contained in:
Jeremy Kerr 2008-10-15 13:16:18 +11:00
parent 04ab591808
commit baf399273f
1 changed files with 30 additions and 4 deletions
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34
arch/powerpc/platforms/cell/spufs/sputrace.c
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@ -40,6 +40,7 @@ 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)
{
@ -109,24 +110,49 @@ static ssize_t sputrace_read(struct file *file, char __user *buf,
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();
spin_unlock(&sputrace_lock);
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,
.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;