| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Base infrastructure for Linux-z/VM Monitor Stream, Stage 1. |
| * Exports appldata_register_ops() and appldata_unregister_ops() for the |
| * data gathering modules. |
| * |
| * Copyright IBM Corp. 2003, 2009 |
| * |
| * 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/sched/stat.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/errno.h> |
| #include <linux/interrupt.h> |
| #include <linux/proc_fs.h> |
| #include <linux/mm.h> |
| #include <linux/swap.h> |
| #include <linux/pagemap.h> |
| #include <linux/sysctl.h> |
| #include <linux/notifier.h> |
| #include <linux/cpu.h> |
| #include <linux/workqueue.h> |
| #include <linux/uaccess.h> |
| #include <linux/io.h> |
| #include <asm/appldata.h> |
| #include <asm/vtimer.h> |
| #include <asm/smp.h> |
| |
| #include "appldata.h" |
| |
| |
| #define APPLDATA_CPU_INTERVAL 10000 /* default (CPU) time for |
| sampling interval in |
| milliseconds */ |
| |
| #define TOD_MICRO 0x01000 /* nr. of TOD clock units |
| for 1 microsecond */ |
| |
| /* |
| * /proc entries (sysctl) |
| */ |
| static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata"; |
| static int appldata_timer_handler(struct ctl_table *ctl, int write, |
| void *buffer, size_t *lenp, loff_t *ppos); |
| static int appldata_interval_handler(struct ctl_table *ctl, int write, |
| void *buffer, size_t *lenp, loff_t *ppos); |
| |
| static struct ctl_table_header *appldata_sysctl_header; |
| static struct ctl_table appldata_table[] = { |
| { |
| .procname = "timer", |
| .mode = S_IRUGO | S_IWUSR, |
| .proc_handler = appldata_timer_handler, |
| }, |
| { |
| .procname = "interval", |
| .mode = S_IRUGO | S_IWUSR, |
| .proc_handler = appldata_interval_handler, |
| }, |
| { }, |
| }; |
| |
| /* |
| * Timer |
| */ |
| static struct vtimer_list appldata_timer; |
| |
| static DEFINE_SPINLOCK(appldata_timer_lock); |
| static int appldata_interval = APPLDATA_CPU_INTERVAL; |
| static int appldata_timer_active; |
| |
| /* |
| * Work queue |
| */ |
| static struct workqueue_struct *appldata_wq; |
| static void appldata_work_fn(struct work_struct *work); |
| static DECLARE_WORK(appldata_work, appldata_work_fn); |
| |
| |
| /* |
| * Ops list |
| */ |
| static DEFINE_MUTEX(appldata_ops_mutex); |
| static LIST_HEAD(appldata_ops_list); |
| |
| |
| /*************************** timer, work, DIAG *******************************/ |
| /* |
| * appldata_timer_function() |
| * |
| * schedule work and reschedule timer |
| */ |
| static void appldata_timer_function(unsigned long data) |
| { |
| queue_work(appldata_wq, (struct work_struct *) data); |
| } |
| |
| /* |
| * appldata_work_fn() |
| * |
| * call data gathering function for each (active) module |
| */ |
| static void appldata_work_fn(struct work_struct *work) |
| { |
| struct list_head *lh; |
| struct appldata_ops *ops; |
| |
| mutex_lock(&appldata_ops_mutex); |
| list_for_each(lh, &appldata_ops_list) { |
| ops = list_entry(lh, struct appldata_ops, list); |
| if (ops->active == 1) { |
| ops->callback(ops->data); |
| } |
| } |
| mutex_unlock(&appldata_ops_mutex); |
| } |
| |
| static struct appldata_product_id appldata_id = { |
| .prod_nr = {0xD3, 0xC9, 0xD5, 0xE4, |
| 0xE7, 0xD2, 0xD9}, /* "LINUXKR" */ |
| .prod_fn = 0xD5D3, /* "NL" */ |
| .version_nr = 0xF2F6, /* "26" */ |
| .release_nr = 0xF0F1, /* "01" */ |
| }; |
| |
| /* |
| * appldata_diag() |
| * |
| * prepare parameter list, issue DIAG 0xDC |
| */ |
| int appldata_diag(char record_nr, u16 function, unsigned long buffer, |
| u16 length, char *mod_lvl) |
| { |
| struct appldata_parameter_list *parm_list; |
| struct appldata_product_id *id; |
| int rc; |
| |
| parm_list = kmalloc(sizeof(*parm_list), GFP_KERNEL); |
| id = kmemdup(&appldata_id, sizeof(appldata_id), GFP_KERNEL); |
| rc = -ENOMEM; |
| if (parm_list && id) { |
| id->record_nr = record_nr; |
| id->mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1]; |
| rc = appldata_asm(parm_list, id, function, |
| (void *) buffer, length); |
| } |
| kfree(id); |
| kfree(parm_list); |
| return rc; |
| } |
| /************************ timer, work, DIAG <END> ****************************/ |
| |
| |
| /****************************** /proc stuff **********************************/ |
| |
| #define APPLDATA_ADD_TIMER 0 |
| #define APPLDATA_DEL_TIMER 1 |
| #define APPLDATA_MOD_TIMER 2 |
| |
| /* |
| * __appldata_vtimer_setup() |
| * |
| * Add, delete or modify virtual timers on all online cpus. |
| * The caller needs to get the appldata_timer_lock spinlock. |
| */ |
| static void __appldata_vtimer_setup(int cmd) |
| { |
| u64 timer_interval = (u64) appldata_interval * 1000 * TOD_MICRO; |
| |
| switch (cmd) { |
| case APPLDATA_ADD_TIMER: |
| if (appldata_timer_active) |
| break; |
| appldata_timer.expires = timer_interval; |
| add_virt_timer_periodic(&appldata_timer); |
| appldata_timer_active = 1; |
| break; |
| case APPLDATA_DEL_TIMER: |
| del_virt_timer(&appldata_timer); |
| if (!appldata_timer_active) |
| break; |
| appldata_timer_active = 0; |
| break; |
| case APPLDATA_MOD_TIMER: |
| if (!appldata_timer_active) |
| break; |
| mod_virt_timer_periodic(&appldata_timer, timer_interval); |
| } |
| } |
| |
| /* |
| * appldata_timer_handler() |
| * |
| * Start/Stop timer, show status of timer (0 = not active, 1 = active) |
| */ |
| static int |
| appldata_timer_handler(struct ctl_table *ctl, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| int timer_active = appldata_timer_active; |
| int rc; |
| struct ctl_table ctl_entry = { |
| .procname = ctl->procname, |
| .data = &timer_active, |
| .maxlen = sizeof(int), |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE, |
| }; |
| |
| rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos); |
| if (rc < 0 || !write) |
| return rc; |
| |
| spin_lock(&appldata_timer_lock); |
| if (timer_active) |
| __appldata_vtimer_setup(APPLDATA_ADD_TIMER); |
| else |
| __appldata_vtimer_setup(APPLDATA_DEL_TIMER); |
| spin_unlock(&appldata_timer_lock); |
| return 0; |
| } |
| |
| /* |
| * appldata_interval_handler() |
| * |
| * Set (CPU) timer interval for collection of data (in milliseconds), show |
| * current timer interval. |
| */ |
| static int |
| appldata_interval_handler(struct ctl_table *ctl, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| int interval = appldata_interval; |
| int rc; |
| struct ctl_table ctl_entry = { |
| .procname = ctl->procname, |
| .data = &interval, |
| .maxlen = sizeof(int), |
| .extra1 = SYSCTL_ONE, |
| }; |
| |
| rc = proc_dointvec_minmax(&ctl_entry, write, buffer, lenp, ppos); |
| if (rc < 0 || !write) |
| return rc; |
| |
| spin_lock(&appldata_timer_lock); |
| appldata_interval = interval; |
| __appldata_vtimer_setup(APPLDATA_MOD_TIMER); |
| spin_unlock(&appldata_timer_lock); |
| return 0; |
| } |
| |
| /* |
| * appldata_generic_handler() |
| * |
| * Generic start/stop monitoring and DIAG, show status of |
| * monitoring (0 = not in process, 1 = in process) |
| */ |
| static int |
| appldata_generic_handler(struct ctl_table *ctl, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| struct appldata_ops *ops = NULL, *tmp_ops; |
| struct list_head *lh; |
| int rc, found; |
| int active; |
| struct ctl_table ctl_entry = { |
| .data = &active, |
| .maxlen = sizeof(int), |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE, |
| }; |
| |
| found = 0; |
| mutex_lock(&appldata_ops_mutex); |
| list_for_each(lh, &appldata_ops_list) { |
| tmp_ops = list_entry(lh, struct appldata_ops, list); |
| if (&tmp_ops->ctl_table[0] == ctl) { |
| found = 1; |
| } |
| } |
| if (!found) { |
| mutex_unlock(&appldata_ops_mutex); |
| return -ENODEV; |
| } |
| ops = ctl->data; |
| if (!try_module_get(ops->owner)) { // protect this function |
| mutex_unlock(&appldata_ops_mutex); |
| return -ENODEV; |
| } |
| mutex_unlock(&appldata_ops_mutex); |
| |
| active = ops->active; |
| rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos); |
| if (rc < 0 || !write) { |
| module_put(ops->owner); |
| return rc; |
| } |
| |
| mutex_lock(&appldata_ops_mutex); |
| if (active && (ops->active == 0)) { |
| // protect work queue callback |
| if (!try_module_get(ops->owner)) { |
| mutex_unlock(&appldata_ops_mutex); |
| module_put(ops->owner); |
| return -ENODEV; |
| } |
| ops->callback(ops->data); // init record |
| rc = appldata_diag(ops->record_nr, |
| APPLDATA_START_INTERVAL_REC, |
| (unsigned long) ops->data, ops->size, |
| ops->mod_lvl); |
| if (rc != 0) { |
| pr_err("Starting the data collection for %s " |
| "failed with rc=%d\n", ops->name, rc); |
| module_put(ops->owner); |
| } else |
| ops->active = 1; |
| } else if (!active && (ops->active == 1)) { |
| ops->active = 0; |
| rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC, |
| (unsigned long) ops->data, ops->size, |
| ops->mod_lvl); |
| if (rc != 0) |
| pr_err("Stopping the data collection for %s " |
| "failed with rc=%d\n", ops->name, rc); |
| module_put(ops->owner); |
| } |
| mutex_unlock(&appldata_ops_mutex); |
| module_put(ops->owner); |
| return 0; |
| } |
| |
| /*************************** /proc stuff <END> *******************************/ |
| |
| |
| /************************* module-ops management *****************************/ |
| /* |
| * appldata_register_ops() |
| * |
| * update ops list, register /proc/sys entries |
| */ |
| int appldata_register_ops(struct appldata_ops *ops) |
| { |
| if (ops->size > APPLDATA_MAX_REC_SIZE) |
| return -EINVAL; |
| |
| /* The last entry must be an empty one */ |
| ops->ctl_table = kcalloc(2, sizeof(struct ctl_table), GFP_KERNEL); |
| if (!ops->ctl_table) |
| return -ENOMEM; |
| |
| mutex_lock(&appldata_ops_mutex); |
| list_add(&ops->list, &appldata_ops_list); |
| mutex_unlock(&appldata_ops_mutex); |
| |
| ops->ctl_table[0].procname = ops->name; |
| ops->ctl_table[0].mode = S_IRUGO | S_IWUSR; |
| ops->ctl_table[0].proc_handler = appldata_generic_handler; |
| ops->ctl_table[0].data = ops; |
| |
| ops->sysctl_header = register_sysctl_sz(appldata_proc_name, ops->ctl_table, 1); |
| if (!ops->sysctl_header) |
| goto out; |
| return 0; |
| out: |
| mutex_lock(&appldata_ops_mutex); |
| list_del(&ops->list); |
| mutex_unlock(&appldata_ops_mutex); |
| kfree(ops->ctl_table); |
| return -ENOMEM; |
| } |
| |
| /* |
| * appldata_unregister_ops() |
| * |
| * update ops list, unregister /proc entries, stop DIAG if necessary |
| */ |
| void appldata_unregister_ops(struct appldata_ops *ops) |
| { |
| mutex_lock(&appldata_ops_mutex); |
| list_del(&ops->list); |
| mutex_unlock(&appldata_ops_mutex); |
| unregister_sysctl_table(ops->sysctl_header); |
| kfree(ops->ctl_table); |
| } |
| /********************** module-ops management <END> **************************/ |
| |
| |
| /******************************* init / exit *********************************/ |
| |
| /* |
| * appldata_init() |
| * |
| * init timer, register /proc entries |
| */ |
| static int __init appldata_init(void) |
| { |
| init_virt_timer(&appldata_timer); |
| appldata_timer.function = appldata_timer_function; |
| appldata_timer.data = (unsigned long) &appldata_work; |
| appldata_wq = alloc_ordered_workqueue("appldata", 0); |
| if (!appldata_wq) |
| return -ENOMEM; |
| appldata_sysctl_header = register_sysctl(appldata_proc_name, appldata_table); |
| return 0; |
| } |
| |
| __initcall(appldata_init); |
| |
| /**************************** init / exit <END> ******************************/ |
| |
| EXPORT_SYMBOL_GPL(appldata_register_ops); |
| EXPORT_SYMBOL_GPL(appldata_unregister_ops); |
| EXPORT_SYMBOL_GPL(appldata_diag); |
| |
| #ifdef CONFIG_SWAP |
| EXPORT_SYMBOL_GPL(si_swapinfo); |
| #endif |
| EXPORT_SYMBOL_GPL(nr_threads); |
| EXPORT_SYMBOL_GPL(nr_running); |
| EXPORT_SYMBOL_GPL(nr_iowait); |