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/*

 * arch/s390/appldata/appldata_os.c

 *

 * Data gathering module for Linux-VM Monitor Stream, Stage 1.

 * Collects misc. OS related data (CPU utilization, running processes).

 *

 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.

 *

 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>

 */

#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 <asm/appldata.h>

#include <asm/smp.h>

#include "appldata.h"

#define MY_PRINT_NAME   "appldata_os"           /* for debug messages, etc. */

#define LOAD_INT(x) ((x) >> FSHIFT)

#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)

/*

 * 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.

 *

 * The record layout is documented in the Linux for zSeries Device Drivers

 * book:

 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml

 */

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[0];

} __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" */

};

static inline void appldata_print_debug(struct appldata_os_data *os_data)

{

        int a0, a1, a2, i;

        P_DEBUG("--- OS - RECORD ---\n");

        P_DEBUG("nr_threads   = %u\n", os_data->nr_threads);

        P_DEBUG("nr_running   = %u\n", os_data->nr_running);

        P_DEBUG("nr_iowait    = %u\n", os_data->nr_iowait);

        P_DEBUG("avenrun(int) = %8x / %8x / %8x\n", os_data->avenrun[0],

                os_data->avenrun[1], os_data->avenrun[2]);

        a0 = os_data->avenrun[0];

        a1 = os_data->avenrun[1];

        a2 = os_data->avenrun[2];

        P_DEBUG("avenrun(float) = %d.%02d / %d.%02d / %d.%02d\n",

                LOAD_INT(a0), LOAD_FRAC(a0), LOAD_INT(a1), LOAD_FRAC(a1),

                LOAD_INT(a2), LOAD_FRAC(a2));

        P_DEBUG("nr_cpus = %u\n", os_data->nr_cpus);

        for (i = 0; i < os_data->nr_cpus; i++) {

                P_DEBUG("cpu%u : user = %u, nice = %u, system = %u, "

                        "idle = %u, irq = %u, softirq = %u, iowait = %u, "

                        "steal = %u\n",

                                os_data->os_cpu[i].cpu_id,

                                os_data->os_cpu[i].per_cpu_user,

                                os_data->os_cpu[i].per_cpu_nice,

                                os_data->os_cpu[i].per_cpu_system,

                                os_data->os_cpu[i].per_cpu_idle,

                                os_data->os_cpu[i].per_cpu_irq,

                                os_data->os_cpu[i].per_cpu_softirq,

                                os_data->os_cpu[i].per_cpu_iowait,

                                os_data->os_cpu[i].per_cpu_steal);

        }

        P_DEBUG("sync_count_1 = %u\n", os_data->sync_count_1);

        P_DEBUG("sync_count_2 = %u\n", os_data->sync_count_2);

        P_DEBUG("timestamp    = %lX\n", os_data->timestamp);

}

/*

 * 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 =

                        cputime_to_jiffies(kstat_cpu(i).cpustat.user);

                os_data->os_cpu[j].per_cpu_nice =

                        cputime_to_jiffies(kstat_cpu(i).cpustat.nice);

                os_data->os_cpu[j].per_cpu_system =

                        cputime_to_jiffies(kstat_cpu(i).cpustat.system);

                os_data->os_cpu[j].per_cpu_idle =

                        cputime_to_jiffies(kstat_cpu(i).cpustat.idle);

                os_data->os_cpu[j].per_cpu_irq =

                        cputime_to_jiffies(kstat_cpu(i).cpustat.irq);

                os_data->os_cpu[j].per_cpu_softirq =

                        cputime_to_jiffies(kstat_cpu(i).cpustat.softirq);

                os_data->os_cpu[j].per_cpu_iowait =

                        cputime_to_jiffies(kstat_cpu(i).cpustat.iowait);

                os_data->os_cpu[j].per_cpu_steal =

                        cputime_to_jiffies(kstat_cpu(i).cpustat.steal);

                os_data->os_cpu[j].cpu_id = i;

                j++;

        }

        os_data->nr_cpus = j;

        new_size = sizeof(struct appldata_os_data) +

                   (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu));

        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) {

                                P_ERROR("os: START NEW DIAG 0xDC failed, "

                                        "return code: %d, new size = %i\n", rc,

                                        new_size);

                                P_INFO("os: stopping old record now\n");

                        } else

                                P_INFO("os: new record size = %i\n", new_size);

                        rc = appldata_diag(APPLDATA_RECORD_OS_ID,

                                           APPLDATA_STOP_REC,

                                           (unsigned long) ops.data, ops.size,

                                           ops.mod_lvl);

                        if (rc != 0)

                                P_ERROR("os: STOP OLD DIAG 0xDC failed, "

                                        "return code: %d, old size = %i\n", rc,

                                        ops.size);

                        else

                                P_INFO("os: old record size = %i stopped\n",

                                        ops.size);

                }

                ops.size = new_size;

        }

        os_data->timestamp = get_clock();

        os_data->sync_count_2++;

#ifdef APPLDATA_DEBUG

        appldata_print_debug(os_data);

#endif

}

/*

 * appldata_os_init()

 *

 * init data, register ops

 */

static int __init appldata_os_init(void)

{

        int rc, max_size;

        max_size = sizeof(struct appldata_os_data) +

                   (NR_CPUS * sizeof(struct appldata_os_per_cpu));

        if (max_size > APPLDATA_MAX_REC_SIZE) {

                P_ERROR("Max. size of OS record = %i, bigger than maximum "

                        "record size (%i)\n", max_size, APPLDATA_MAX_REC_SIZE);

                rc = -ENOMEM;

                goto out;

        }

        P_DEBUG("max. sizeof(os) = %i, sizeof(os_cpu) = %lu\n", max_size,

                sizeof(struct appldata_os_per_cpu));

        appldata_os_data = kzalloc(max_size, GFP_DMA);

        if (appldata_os_data == NULL) {

                P_ERROR("No memory for %s!\n", ops.name);

                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);

        P_DEBUG("cpu offset = %u\n", appldata_os_data->cpu_offset);

        ops.data = appldata_os_data;

        ops.callback  = &appldata_get_os_data;

        rc = appldata_register_ops(&ops);

        if (rc != 0) {

                P_ERROR("Error registering ops, rc = %i\n", rc);

                kfree(appldata_os_data);

        } else {

                P_DEBUG("%s-ops registered!\n", ops.name);

        }

out:

        return rc;

}

/*

 * appldata_os_exit()

 *

 * unregister ops

 */

static void __exit appldata_os_exit(void)

{

        appldata_unregister_ops(&ops);

        kfree(appldata_os_data);

        P_DEBUG("%s-ops unregistered!\n", ops.name);

}

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");