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mp2_rms.c
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mp2_rms.c
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#include "mp2_rms.h"
#include "mp2_list.h"
#include "mp2_dispatch.h"
static struct proc_dir_entry *my_proc_dir;
static struct proc_dir_entry *my_proc_file;
extern int LOW_PRIORITY;
extern int HIGH_PRIORITY;
// current task
struct mp2_task_struct * running_task;
struct task_struct * dispatch_thread;
spinlock_t spinlock;
/*
* Callback function for the timer
*/
void wakeup_timer_callback(unsigned long pid)
{
unsigned long flag;
printk(KERN_INFO "wakeup_timer_callback: set to READY and wake up dispatching");
//use spin_lock to protect shared valuable
spin_lock_irqsave(&spinlock,flag);
struct mp2_task_struct* this_task=find_list((int)pid);
if(this_task!=NULL)
{
set_mp2_task_state(this_task,READY);
}
wake_up_process(dispatch_thread);
spin_unlock_irqrestore(&spinlock,flag);
}
/*
* module initialize function
*/
int mod_init(void)
{
spin_lock_init(&spinlock);
// slab allocation
task_struct_cachep = kmem_cache_create("mp2_task_struct", sizeof(struct mp2_task_struct), ARCH_MIN_TASKALIGN, SLAB_PANIC | SLAB_NOTRACK, NULL);
//initialize the task list
init_list();
printk(KERN_INFO "Init Linked List successfully \n");
// create proc directory /proc/mp2
my_proc_dir = proc_mkdir("mp2", NULL);
if(!my_proc_dir)
{
printk(KERN_INFO "create dir fail\n");
return -1;
}
else
printk(KERN_INFO "Create /proc/mp2/ successfully \n");
// create proc entry /proc/mp2/status
my_proc_file = create_proc_entry("status", 0666, my_proc_dir);
if(!my_proc_file)
{
printk("create proc entry fails \n");
remove_proc_entry("mp2",NULL);
return -1;
}
else
printk(KERN_INFO "Create /proc/mp2/status successfully \n");
// assign read and write callback function
my_proc_file->write_proc = write_callback;
my_proc_file->read_proc = read_callback;
running_task = NULL;
// create the dispatch thread
dispatch_thread = kthread_create(mp2_dispatch_fn, NULL, "mp2_dispatch_thread"); // call the dispatch function
if(!IS_ERR(dispatch_thread))
{
printk(KERN_INFO "Create dispatching thread successfully \n");
}else
{
printk(KERN_INFO "Fail to create dispatching thread \n");
}
//struct sched_param sparam;
//sparam.sched_priority = HIGH_PRIORITY; // dispatch thread has the highest real time priority
//sched_setscheduler(dispatch_thread, SCHED_FIFO, &sparam);
return 0;
}
/*
* module exit funtion
*/
void mod_exit(void)
{
// stop the dispatching thread
if(!IS_ERR(dispatch_thread))
{
kthread_stop(dispatch_thread);
printk(KERN_INFO "mod_exit: Stop dispatch_thread successfully. \n");
}
//delete workqueue
//rm_workqueue();
//delete the list
delete_list();
kmem_cache_destroy(task_struct_cachep);
remove_proc_entry("status", my_proc_dir);
remove_proc_entry("mp2", NULL);
printk(KERN_INFO "mod_exit: Delete proc entry successfully. \n");
}
/*
* write callback function of /proc/mp2/status
*/
ssize_t write_callback(struct file * filp, const char __user *buff,
unsigned long len, void *data)
{
char * kbuff;
kbuff=(char *)vmalloc(MAX_BUFF_LENGTH);
if(!kbuff)
return -ENOMEM;
else
memset(kbuff,0,MAX_BUFF_LENGTH);
if(len > MAX_BUFF_LENGTH)
{
printk(KERN_INFO "process_refister_write: write too long\n");
return -ENOSPC;
}
if(copy_from_user(kbuff,buff,len))
return -EFAULT;
printk(KERN_INFO "kbuff: %s", kbuff);
// parse and handle message
message_handler(kbuff);
vfree(kbuff);
return len;
}
/*
* Parse and handle message from /proc
*/
void message_handler(char * kbuff)
{
switch (kbuff[0])
{
// registration message
case 'R':
register_handler(kbuff);
break;
// yield message
case 'Y':
yield_handler(kbuff);
break;
// de-registration message
case 'D':
deregister_handler(kbuff);
break;
default:
printk(KERN_INFO "Message Error! \n");
break;
}
}
/*
* handle registeration message
* add a process to the list
*/
void register_handler(char * kbuff)
{
int pid, period, comp_time;
int re;
//struct task_struct * linux_task;
printk(KERN_INFO "Message: Registration\n");
re = sscanf(kbuff,"R,%d,%d,%d",&pid,&period,&comp_time);
if (re != 3)
{
printk(KERN_INFO "Registration message parsing error\n");
return;
}
printk(KERN_INFO "Pid: %d, Period: %d, Computation Time: %d\n", pid, period, comp_time);
//linux_task = kmem_cache_alloc(task_struct_cachep, GFP_KERNEL);
add(pid, period, comp_time);
}
/*
* handle yield message
*/
void yield_handler(char * kbuff)
{
int pid;
struct mp2_task_struct * task;
int re;
struct sched_param sparam;
printk(KERN_INFO "Message: Yield\n");
re= sscanf(kbuff,"Y,%d",&pid);
if (re != 1)
{
printk(KERN_INFO "Yield message parsing error\n");
}
else
{
printk(KERN_INFO "Pid: %d\n", pid);
task = find_list(pid);
if(task==NULL)
{
printk(KERN_INFO "yield_handler: no task with this pid is found in list");
}else
{
if(running_task==task)
{
running_task=NULL;
}
printk(KERN_INFO "Find a task with Pid: %d \n", task->pid);
set_mp2_task_state(task,SLEEPING);
printk(KERN_INFO "Set a linux-task with Pid: %d to SLEEPING \n", pid);
set_task_state(task->linux_task,TASK_UNINTERRUPTIBLE);
sparam.sched_priority=LOW_PRIORITY;
sched_setscheduler(task->linux_task,SCHED_NORMAL,&sparam);
//schedule();
printk(KERN_INFO "Set a timer of task Pid: %d with time: %d \n", pid,task->period-task->comp_time);
mod_timer((&task->wakeup_timer),jiffies+msecs_to_jiffies(task->period-task->comp_time));
}
printk(KERN_INFO "Wake up dispatching thread: %d\n ", pid);
wake_up_process(dispatch_thread);
}
}
/*
* handle de-registeration message
* remove the process from the list
*/
void deregister_handler(char * kbuff)
{
int pid;
int re = sscanf(kbuff,"D,%d",&pid);
printk(KERN_INFO "Message: De-registration\n");
if (re != 1)
printk(KERN_INFO "De-registration message parsing error\n");
else
{
printk(KERN_INFO "Pid: %d\n", pid);
delete_one_mp2_task(pid);
}
}
/*
* read callback function of /proc/mp2/status
*/
int read_callback(char *page,char ** start,off_t off,int count, int *eof,void *data)
{
int len;
printk(KERN_INFO "process list read callback\n");
if(off > 0)
{
*eof = 1;
return 0;
}
len = 0;
len = read_list(page);
return len;
}
module_init(mod_init);
module_exit(mod_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("CS423 MP2");
MODULE_AUTHOR("G3");
/*
void wakeup_timer_callback(unsigned long pid)
{
//struct mp2_task_struct* task=(struct mp2_task_struct*)task_addr;
struct mp2_work * my_work;
my_work=(struct mp2_work*)kmalloc(sizeof(struct mp2_work),GFP_KERNEL);
if(my_work)
{
//INIT_WORK((struct work_struct *)my_work,wakeup_timer_work_fn);
INIT_WORK(&(my_work->work),wakeup_timer_work_fn);
my_work->mp2_task=task;
queue_work(wq,(struct work_struct *)my_work);
}else
{
printk(KERN_INFO "wakeup_timer_callback: fail to kmalloc for work_t");
}
}*/
/*
struct workqueue_struct * wq;
struct mp2_work {
struct work_struct work;
struct mp2_task_struct* mp2_task;
};
void init_workqueue(void)
{
wq=create_workqueue("my_queue");
if(!wq)
{
printk(KERN_INFO "init_workqueue: Fail to create work_queue");
}
}
void rm_workqueue(void)
{
flush_workqueue(wq);
destroy_workqueue(wq);
printk(KERN_INFO "rm_workqueue: Succeed to remove work_queue");
}
void wakeup_timer_work_fn(struct work_struct * work)
{
printk(KERN_INFO "Wakeup timer handler: set the task READY \n");
//put the work_struct to the workqueue_struct
struct mp2_work * my_work= (struct mp2_work *) work;
if(my_work->mp2_task!=NULL)
{
set_mp2_task_state(my_work->mp2_task,READY);
}
//remember to free the space of the work
kfree((void*)work);
printk(KERN_INFO "Wakeup timer handler: wake up dispatch_thread \n");
wake_up_process(dispatch_thread);
}*/