[POWERPC] spufs: Add spu stats in sysfs

Export spu statistics in sysfs.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c
index 174bd9f911db..e4d0c9f42abd 100644
--- a/arch/powerpc/platforms/cell/spu_base.c
+++ b/arch/powerpc/platforms/cell/spu_base.c
@@ -585,6 +585,9 @@ static int __init create_spu(void *data)
 	spin_unlock_irqrestore(&spu_list_lock, flags);
 	mutex_unlock(&spu_mutex);
 
+	spu->stats.utilization_state = SPU_UTIL_IDLE;
+	spu->stats.tstamp = jiffies;
+
 	goto out;
 
 out_free_irqs:
@@ -597,6 +600,45 @@ out:
 	return ret;
 }
 
+static const char *spu_state_names[] = {
+	"user", "system", "iowait", "idle"
+};
+
+static unsigned long long spu_acct_time(struct spu *spu,
+		enum spu_utilization_state state)
+{
+	unsigned long long time = spu->stats.times[state];
+
+	if (spu->stats.utilization_state == state)
+		time += jiffies - spu->stats.tstamp;
+
+	return jiffies_to_msecs(time);
+}
+
+
+static ssize_t spu_stat_show(struct sys_device *sysdev, char *buf)
+{
+	struct spu *spu = container_of(sysdev, struct spu, sysdev);
+
+	return sprintf(buf, "%s %llu %llu %llu %llu "
+		      "%llu %llu %llu %llu %llu %llu %llu %llu\n",
+		spu_state_names[spu->stats.utilization_state],
+		spu_acct_time(spu, SPU_UTIL_USER),
+		spu_acct_time(spu, SPU_UTIL_SYSTEM),
+		spu_acct_time(spu, SPU_UTIL_IOWAIT),
+		spu_acct_time(spu, SPU_UTIL_IDLE),
+		spu->stats.vol_ctx_switch,
+		spu->stats.invol_ctx_switch,
+		spu->stats.slb_flt,
+		spu->stats.hash_flt,
+		spu->stats.min_flt,
+		spu->stats.maj_flt,
+		spu->stats.class2_intr,
+		spu->stats.libassist);
+}
+
+static SYSDEV_ATTR(stat, 0644, spu_stat_show, NULL);
+
 static int __init init_spu_base(void)
 {
 	int i, ret = 0;
@@ -622,6 +664,8 @@ static int __init init_spu_base(void)
 
 	xmon_register_spus(&spu_full_list);
 
+	spu_add_sysdev_attr(&attr_stat);
+
 	return 0;
 
  out_unregister_sysdev_class: