s390/sysinfo,topology: provide raw stsi 15,1,x data via debugfs

Provide the raw stsi 15,1,x data contents via debugfs. This makes it
much easier to debug unexpected scheduling domains on machines that
provide cpu topology information.

Therefore this file adds a new 's390/stsi' debugfs directory with a
file for each possible topology nesting level that is allowed by the
architecture. The files will be created regardless if the machine
supports all, or any, level.  If a level is not supported, or no data
is available, user space can recognize this with a -EINVAL error code
when trying to read such data.
In addition a 'topology' symlink is created that points to the file
that contains the data that is used to create the scheduling domains.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 80 insertions, 0 deletions

diff --git a/arch/s390/kernel/sysinfo.c b/arch/s390/kernel/sysinfo.c
index 12b6b138e354..1d4680e38378 100644
--- a/arch/s390/kernel/sysinfo.c
+++ b/arch/s390/kernel/sysinfo.c
@@ -4,6 +4,7 @@
  *	       Martin Schwidefsky <schwidefsky@de.ibm.com>,
  */
 
+#include <linux/debugfs.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/proc_fs.h>
@@ -13,6 +14,7 @@
 #include <linux/export.h>
 #include <linux/slab.h>
 #include <asm/ebcdic.h>
+#include <asm/debug.h>
 #include <asm/sysinfo.h>
 #include <asm/cpcmd.h>
 #include <asm/topology.h>
@@ -485,3 +487,81 @@ void calibrate_delay(void)
 	       "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 	       (loops_per_jiffy/(5000/HZ)) % 100);
 }
+
+#ifdef CONFIG_DEBUG_FS
+
+#define STSI_FILE(fc, s1, s2)						       \
+static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\
+{									       \
+	file->private_data = (void *) get_zeroed_page(GFP_KERNEL);	       \
+	if (!file->private_data)					       \
+		return -ENOMEM;						       \
+	if (stsi(file->private_data, fc, s1, s2)) {			       \
+		free_page((unsigned long)file->private_data);		       \
+		file->private_data = NULL;				       \
+		return -EACCES;						       \
+	}								       \
+	return nonseekable_open(inode, file);				       \
+}									       \
+									       \
+static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = {       \
+	.open		= stsi_open_##fc##_##s1##_##s2,			       \
+	.release	= stsi_release,					       \
+	.read		= stsi_read,					       \
+	.llseek		= no_llseek,					       \
+};
+
+static int stsi_release(struct inode *inode, struct file *file)
+{
+	free_page((unsigned long)file->private_data);
+	return 0;
+}
+
+static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
+{
+	return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE);
+}
+
+STSI_FILE(15, 1, 2);
+STSI_FILE(15, 1, 3);
+STSI_FILE(15, 1, 4);
+STSI_FILE(15, 1, 5);
+STSI_FILE(15, 1, 6);
+
+struct stsi_file {
+	const struct file_operations *fops;
+	char *name;
+};
+
+static struct stsi_file stsi_file[] __initdata = {
+	{.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"},
+	{.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"},
+	{.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"},
+	{.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"},
+	{.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"},
+};
+
+static __init int stsi_init_debugfs(void)
+{
+	struct dentry *stsi_root;
+	struct stsi_file *sf;
+	int i;
+
+	stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir);
+	if (IS_ERR_OR_NULL(stsi_root))
+		return 0;
+	for (i = 0; i < ARRAY_SIZE(stsi_file); i++) {
+		sf = &stsi_file[i];
+		debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops);
+	}
+	if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) {
+		char link_to[10];
+
+		sprintf(link_to, "15_1_%d", topology_mnest_limit());
+		debugfs_create_symlink("topology", stsi_root, link_to);
+	}
+	return 0;
+}
+device_initcall(stsi_init_debugfs);
+
+#endif /* CONFIG_DEBUG_FS */