[mirror_ubuntu-jammy-kernel.git] / arch / s390 / appldata / appldata_os.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
 * Collects misc. OS related data (CPU utilization, running processes).
 *
 * Copyright IBM Corp. 2003, 2006
 *
 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
 */

#define KMSG_COMPONENT	"appldata"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/netdevice.h>
#include <linux/sched.h>
#include <linux/sched/loadavg.h>
#include <linux/sched/stat.h>
#include <asm/appldata.h>
#include <asm/smp.h>

#include "appldata.h"

/*
 * OS data
 *
 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
 * the structure version (product ID, see appldata_base.c) needs to be changed
 * as well and all documentation and z/VM applications using it must be
 * updated.
 */
struct appldata_os_per_cpu {
	u32 per_cpu_user;	/* timer ticks spent in user mode   */
	u32 per_cpu_nice;	/* ... spent with modified priority */
	u32 per_cpu_system;	/* ... spent in kernel mode         */
	u32 per_cpu_idle;	/* ... spent in idle mode           */

	/* New in 2.6 */
	u32 per_cpu_irq;	/* ... spent in interrupts          */
	u32 per_cpu_softirq;	/* ... spent in softirqs            */
	u32 per_cpu_iowait;	/* ... spent while waiting for I/O  */

	/* New in modification level 01 */
	u32 per_cpu_steal;	/* ... stolen by hypervisor	    */
	u32 cpu_id;		/* number of this CPU		    */
} __attribute__((packed));

struct appldata_os_data {
	u64 timestamp;
	u32 sync_count_1;	/* after VM collected the record data, */
	u32 sync_count_2;	/* sync_count_1 and sync_count_2 should be the
				   same. If not, the record has been updated on
				   the Linux side while VM was collecting the
				   (possibly corrupt) data */

	u32 nr_cpus;		/* number of (virtual) CPUs        */
	u32 per_cpu_size;	/* size of the per-cpu data struct */
	u32 cpu_offset;		/* offset of the first per-cpu data struct */

	u32 nr_running;		/* number of runnable threads      */
	u32 nr_threads;		/* number of threads               */
	u32 avenrun[3];		/* average nr. of running processes during */
				/* the last 1, 5 and 15 minutes */

	/* New in 2.6 */
	u32 nr_iowait;		/* number of blocked threads
				   (waiting for I/O)               */

	/* per cpu data */
	struct appldata_os_per_cpu os_cpu[];
} __attribute__((packed));

static struct appldata_os_data *appldata_os_data;

static struct appldata_ops ops = {
	.name	   = "os",
	.record_nr = APPLDATA_RECORD_OS_ID,
	.owner	   = THIS_MODULE,
	.mod_lvl   = {0xF0, 0xF1},		/* EBCDIC "01" */
};


/*
 * appldata_get_os_data()
 *
 * gather OS data
 */
static void appldata_get_os_data(void *data)
{
	int i, j, rc;
	struct appldata_os_data *os_data;
	unsigned int new_size;

	os_data = data;
	os_data->sync_count_1++;

	os_data->nr_threads = nr_threads;
	os_data->nr_running = nr_running();
	os_data->nr_iowait  = nr_iowait();
	os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
	os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
	os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);

	j = 0;
	for_each_online_cpu(i) {
		os_data->os_cpu[j].per_cpu_user =
			nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_USER]);
		os_data->os_cpu[j].per_cpu_nice =
			nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_NICE]);
		os_data->os_cpu[j].per_cpu_system =
			nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]);
		os_data->os_cpu[j].per_cpu_idle =
			nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IDLE]);
		os_data->os_cpu[j].per_cpu_irq =
			nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IRQ]);
		os_data->os_cpu[j].per_cpu_softirq =
			nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]);
		os_data->os_cpu[j].per_cpu_iowait =
			nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IOWAIT]);
		os_data->os_cpu[j].per_cpu_steal =
			nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_STEAL]);
		os_data->os_cpu[j].cpu_id = i;
		j++;
	}

	os_data->nr_cpus = j;

	new_size = struct_size(os_data, os_cpu, os_data->nr_cpus);
	if (ops.size != new_size) {
		if (ops.active) {
			rc = appldata_diag(APPLDATA_RECORD_OS_ID,
					   APPLDATA_START_INTERVAL_REC,
					   (unsigned long) ops.data, new_size,
					   ops.mod_lvl);
			if (rc != 0)
				pr_err("Starting a new OS data collection "
				       "failed with rc=%d\n", rc);

			rc = appldata_diag(APPLDATA_RECORD_OS_ID,
					   APPLDATA_STOP_REC,
					   (unsigned long) ops.data, ops.size,
					   ops.mod_lvl);
			if (rc != 0)
				pr_err("Stopping a faulty OS data "
				       "collection failed with rc=%d\n", rc);
		}
		ops.size = new_size;
	}
	os_data->timestamp = get_tod_clock();
	os_data->sync_count_2++;
}


/*
 * appldata_os_init()
 *
 * init data, register ops
 */
static int __init appldata_os_init(void)
{
	int rc, max_size;

	max_size = struct_size(appldata_os_data, os_cpu, num_possible_cpus());
	if (max_size > APPLDATA_MAX_REC_SIZE) {
		pr_err("Maximum OS record size %i exceeds the maximum "
		       "record size %i\n", max_size, APPLDATA_MAX_REC_SIZE);
		rc = -ENOMEM;
		goto out;
	}

	appldata_os_data = kzalloc(max_size, GFP_KERNEL | GFP_DMA);
	if (appldata_os_data == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu);
	appldata_os_data->cpu_offset   = offsetof(struct appldata_os_data,
							os_cpu);

	ops.data = appldata_os_data;
	ops.callback  = &appldata_get_os_data;
	rc = appldata_register_ops(&ops);
	if (rc != 0)
		kfree(appldata_os_data);
out:
	return rc;
}

/*
 * appldata_os_exit()
 *
 * unregister ops
 */
static void __exit appldata_os_exit(void)
{
	appldata_unregister_ops(&ops);
	kfree(appldata_os_data);
}


module_init(appldata_os_init);
module_exit(appldata_os_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gerald Schaefer");
MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");
Commit	Line	Data
0caa8cdf	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
1da177e4 LT	3	* Data gathering module for Linux-VM Monitor Stream, Stage 1.
	4	* Collects misc. OS related data (CPU utilization, running processes).
	5	*
a53c8fab	6	* Copyright IBM Corp. 2003, 2006
1da177e4	7	*
5b5dd21a	8	* Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
1da177e4 LT	9	*/
1da177e4 LT	10
e7534b0e GS	11	#define KMSG_COMPONENT "appldata"
	12	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	13
1da177e4 LT	14	#include <linux/module.h>
	15	#include <linux/init.h>
	16	#include <linux/slab.h>
	17	#include <linux/errno.h>
	18	#include <linux/kernel_stat.h>
	19	#include <linux/netdevice.h>
	20	#include <linux/sched.h>
4f17722c	21	#include <linux/sched/loadavg.h>
03441a34	22	#include <linux/sched/stat.h>
1f38d613	23	#include <asm/appldata.h>
1da177e4 LT	24	#include <asm/smp.h>
	25
	26	#include "appldata.h"
	27
1da177e4 LT	28	/*
	29	* OS data
	30	*
	31	* This is accessed as binary data by z/VM. If changes to it can't be avoided,
	32	* the structure version (product ID, see appldata_base.c) needs to be changed
	33	* as well and all documentation and z/VM applications using it must be
	34	* updated.
1da177e4 LT	35	*/
	36	struct appldata_os_per_cpu {
	37	u32 per_cpu_user; /* timer ticks spent in user mode */
	38	u32 per_cpu_nice; /* ... spent with modified priority */
	39	u32 per_cpu_system; /* ... spent in kernel mode */
	40	u32 per_cpu_idle; /* ... spent in idle mode */
	41
5b5dd21a	42	/* New in 2.6 */
1da177e4 LT	43	u32 per_cpu_irq; /* ... spent in interrupts */
	44	u32 per_cpu_softirq; /* ... spent in softirqs */
	45	u32 per_cpu_iowait; /* ... spent while waiting for I/O */
5b5dd21a GS	46
	47	/* New in modification level 01 */
	48	u32 per_cpu_steal; /* ... stolen by hypervisor */
	49	u32 cpu_id; /* number of this CPU */
f26d583e	50	} __attribute__((packed));
1da177e4 LT	51
	52	struct appldata_os_data {
	53	u64 timestamp;
	54	u32 sync_count_1; /* after VM collected the record data, */
	55	u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
	56	same. If not, the record has been updated on
	57	the Linux side while VM was collecting the
	58	(possibly corrupt) data */
	59
	60	u32 nr_cpus; /* number of (virtual) CPUs */
	61	u32 per_cpu_size; /* size of the per-cpu data struct */
	62	u32 cpu_offset; /* offset of the first per-cpu data struct */
	63
	64	u32 nr_running; /* number of runnable threads */
	65	u32 nr_threads; /* number of threads */
	66	u32 avenrun[3]; /* average nr. of running processes during */
	67	/* the last 1, 5 and 15 minutes */
	68
5b5dd21a	69	/* New in 2.6 */
1da177e4 LT	70	u32 nr_iowait; /* number of blocked threads
1da177e4 LT	71	(waiting for I/O) */
1da177e4 LT	72
1da177e4 LT	73	/* per cpu data */
fa226f1d	74	struct appldata_os_per_cpu os_cpu[];
f26d583e	75	} __attribute__((packed));
1da177e4 LT	76
	77	static struct appldata_os_data *appldata_os_data;
	78
5b5dd21a	79	static struct appldata_ops ops = {
5b5dd21a GS	80	.name = "os",
	81	.record_nr = APPLDATA_RECORD_OS_ID,
	82	.owner = THIS_MODULE,
	83	.mod_lvl = {0xF0, 0xF1}, /* EBCDIC "01" */
	84	};
	85
1da177e4	86
1da177e4 LT	87	/*
	88	* appldata_get_os_data()
	89	*
	90	* gather OS data
	91	*/
	92	static void appldata_get_os_data(void *data)
	93	{
5b5dd21a	94	int i, j, rc;
1da177e4	95	struct appldata_os_data *os_data;
5b5dd21a	96	unsigned int new_size;
1da177e4 LT	97
	98	os_data = data;
	99	os_data->sync_count_1++;
	100
1da177e4 LT	101	os_data->nr_threads = nr_threads;
	102	os_data->nr_running = nr_running();
	103	os_data->nr_iowait = nr_iowait();
	104	os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
	105	os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
	106	os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);
	107
	108	j = 0;
	109	for_each_online_cpu(i) {
	110	os_data->os_cpu[j].per_cpu_user =
7fb1327e	111	nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_USER]);
1da177e4	112	os_data->os_cpu[j].per_cpu_nice =
7fb1327e	113	nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_NICE]);
1da177e4	114	os_data->os_cpu[j].per_cpu_system =
7fb1327e	115	nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]);
1da177e4	116	os_data->os_cpu[j].per_cpu_idle =
7fb1327e	117	nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IDLE]);
1da177e4	118	os_data->os_cpu[j].per_cpu_irq =
7fb1327e	119	nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IRQ]);
1da177e4	120	os_data->os_cpu[j].per_cpu_softirq =
7fb1327e	121	nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]);
1da177e4	122	os_data->os_cpu[j].per_cpu_iowait =
7fb1327e	123	nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IOWAIT]);
5b5dd21a	124	os_data->os_cpu[j].per_cpu_steal =
7fb1327e	125	nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_STEAL]);
5b5dd21a	126	os_data->os_cpu[j].cpu_id = i;
1da177e4 LT	127	j++;
	128	}
	129
5b5dd21a GS	130	os_data->nr_cpus = j;
5b5dd21a GS	131
28ccce5f	132	new_size = struct_size(os_data, os_cpu, os_data->nr_cpus);
5b5dd21a GS	133	if (ops.size != new_size) {
	134	if (ops.active) {
	135	rc = appldata_diag(APPLDATA_RECORD_OS_ID,
	136	APPLDATA_START_INTERVAL_REC,
	137	(unsigned long) ops.data, new_size,
	138	ops.mod_lvl);
d3ae942d	139	if (rc != 0)
e7534b0e GS	140	pr_err("Starting a new OS data collection "
e7534b0e GS	141	"failed with rc=%d\n", rc);
5b5dd21a GS	142
	143	rc = appldata_diag(APPLDATA_RECORD_OS_ID,
	144	APPLDATA_STOP_REC,
	145	(unsigned long) ops.data, ops.size,
	146	ops.mod_lvl);
	147	if (rc != 0)
e7534b0e GS	148	pr_err("Stopping a faulty OS data "
e7534b0e GS	149	"collection failed with rc=%d\n", rc);
5b5dd21a GS	150	}
	151	ops.size = new_size;
	152	}
1aae0560	153	os_data->timestamp = get_tod_clock();
1da177e4	154	os_data->sync_count_2++;
1da177e4 LT	155	}
	156
	157
1da177e4 LT	158	/*
	159	* appldata_os_init()
	160	*
	161	* init data, register ops
	162	*/
	163	static int __init appldata_os_init(void)
	164	{
5b5dd21a	165	int rc, max_size;
1da177e4	166
28ccce5f	167	max_size = struct_size(appldata_os_data, os_cpu, num_possible_cpus());
5b5dd21a	168	if (max_size > APPLDATA_MAX_REC_SIZE) {
e7534b0e GS	169	pr_err("Maximum OS record size %i exceeds the maximum "
e7534b0e GS	170	"record size %i\n", max_size, APPLDATA_MAX_REC_SIZE);
1da177e4 LT	171	rc = -ENOMEM;
	172	goto out;
	173	}
1da177e4	174
c2f0e8c8	175	appldata_os_data = kzalloc(max_size, GFP_KERNEL \| GFP_DMA);
1da177e4	176	if (appldata_os_data == NULL) {
1da177e4 LT	177	rc = -ENOMEM;
	178	goto out;
	179	}
1da177e4 LT	180
	181	appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu);
	182	appldata_os_data->cpu_offset = offsetof(struct appldata_os_data,
	183	os_cpu);
1da177e4 LT	184
1da177e4 LT	185	ops.data = appldata_os_data;
5b5dd21a	186	ops.callback = &appldata_get_os_data;
1da177e4	187	rc = appldata_register_ops(&ops);
d3ae942d	188	if (rc != 0)
1da177e4	189	kfree(appldata_os_data);
1da177e4 LT	190	out:
	191	return rc;
	192	}
	193
	194	/*
	195	* appldata_os_exit()
	196	*
	197	* unregister ops
	198	*/
	199	static void __exit appldata_os_exit(void)
	200	{
	201	appldata_unregister_ops(&ops);
	202	kfree(appldata_os_data);
1da177e4 LT	203	}
	204
	205
	206	module_init(appldata_os_init);
	207	module_exit(appldata_os_exit);
	208
	209	MODULE_LICENSE("GPL");
	210	MODULE_AUTHOR("Gerald Schaefer");
	211	MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");