s390/diag: add a statistic for diagnose calls

Introduce /sys/debug/kernel/diag_stat with a statistic how many diagnose
calls have been done by each CPU in the system.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 115 insertions, 1 deletions

diff --git a/arch/s390/kernel/diag.c b/arch/s390/kernel/diag.c
index 2f69243bf700..4ddb5200ddf0 100644
--- a/arch/s390/kernel/diag.c
+++ b/arch/s390/kernel/diag.c
@@ -6,12 +6,119 @@
  */
 
 #include <linux/module.h>
+#include <linux/cpu.h>
+#include <linux/seq_file.h>
+#include <linux/debugfs.h>
 #include <asm/diag.h>
 
+DEFINE_PER_CPU(struct diag_stat, diag_stat);
+EXPORT_PER_CPU_SYMBOL(diag_stat);
+
+struct diag_desc {
+	int code;
+	char *name;
+};
+
+static const struct diag_desc diag_map[NR_DIAG_STAT] = {
+	[DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" },
+	[DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" },
+	[DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" },
+	[DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" },
+	[DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" },
+	[DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" },
+	[DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" },
+	[DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" },
+	[DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" },
+	[DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" },
+	[DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" },
+	[DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" },
+	[DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" },
+	[DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" },
+	[DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" },
+	[DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
+	[DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
+	[DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
+	[DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
+};
+
+static int show_diag_stat(struct seq_file *m, void *v)
+{
+	struct diag_stat *stat;
+	unsigned long n = (unsigned long) v - 1;
+	int cpu, prec, tmp;
+
+	get_online_cpus();
+	if (n == 0) {
+		seq_puts(m, "         ");
+
+		for_each_online_cpu(cpu) {
+			prec = 10;
+			for (tmp = 10; cpu >= tmp; tmp *= 10)
+				prec--;
+			seq_printf(m, "%*s%d", prec, "CPU", cpu);
+		}
+		seq_putc(m, '\n');
+	} else if (n <= NR_DIAG_STAT) {
+		seq_printf(m, "diag %03x:", diag_map[n-1].code);
+		for_each_online_cpu(cpu) {
+			stat = &per_cpu(diag_stat, cpu);
+			seq_printf(m, " %10u", stat->counter[n-1]);
+		}
+		seq_printf(m, "    %s\n", diag_map[n-1].name);
+	}
+	put_online_cpus();
+	return 0;
+}
+
+static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
+{
+	return *pos <= nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
+}
+
+static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
+{
+	++*pos;
+	return show_diag_stat_start(m, pos);
+}
+
+static void show_diag_stat_stop(struct seq_file *m, void *v)
+{
+}
+
+static const struct seq_operations show_diag_stat_sops = {
+	.start	= show_diag_stat_start,
+	.next	= show_diag_stat_next,
+	.stop	= show_diag_stat_stop,
+	.show	= show_diag_stat,
+};
+
+static int show_diag_stat_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &show_diag_stat_sops);
+}
+
+static const struct file_operations show_diag_stat_fops = {
+	.open		= show_diag_stat_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
+
+
+static int __init show_diag_stat_init(void)
+{
+	debugfs_create_file("diag_stat", 0400, NULL, NULL,
+			    &show_diag_stat_fops);
+	return 0;
+}
+
+device_initcall(show_diag_stat_init);
+
 /*
  * Diagnose 14: Input spool file manipulation
  */
-int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
+static inline int __diag14(unsigned long rx, unsigned long ry1,
+			   unsigned long subcode)
 {
 	register unsigned long _ry1 asm("2") = ry1;
 	register unsigned long _ry2 asm("3") = subcode;
@@ -29,6 +136,12 @@ int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
 
 	return rc;
 }
+
+int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
+{
+	diag_stat_inc(DIAG_STAT_X014);
+	return __diag14(rx, ry1, subcode);
+}
 EXPORT_SYMBOL(diag14);
 
 /*
@@ -48,6 +161,7 @@ int diag210(struct diag210 *addr)
 	spin_lock_irqsave(&diag210_lock, flags);
 	diag210_tmp = *addr;
 
+	diag_stat_inc(DIAG_STAT_X210);
 	asm volatile(
 		"	lhi	%0,-1\n"
 		"	sam31\n"