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//=====================================================================

//       FFFFFFIII   RRRRR      SSTTTTTTT

//      FF         IIR   RR    SS

//     FF           IR        SS

//    FFFFFF         RRRR    SSSSST      

//   FF       FI       RRR  SS

//  FF         II     RRR  SS

// FF           IIIIIR    RS 

//       

// Basic FSF(FIRST Scheduling Framework) contract management

// S.Ha.R.K. Implementation

//=====================================================================

#include "ll/i386/64bit.h"

#include "fsf_contract.h"

#include "fsf_server.h"

#include <pthread.h>

#include <stdlib.h>

//#define FSF_DEBUG

int current=0;

server_elem server_list[FSF_MAX_N_SERVERS];

bandwidth_t fsf_max_bw = 0;

int fsf_server_level;

int FSF_register_module(int server_level, bandwidth_t max_bw)

{

  printk("FSF Module\n");

  current=0;

  fsf_server_level = server_level;

  fsf_max_bw = max_bw;

  return 0;

}

/* Convert the contract specification to

 * budget parameters

 */

int set_SERVER_budget_from_contract

  (const fsf_contract_parameters_t *contract,

   int *budget)

{

  int local_scheduler_level = 0;

   switch (contract->local_scheduler_id) {

     case FSF_SCHEDULER_POSIX:

       local_scheduler_level = POSIXSTAR_register_level(fsf_server_level,5000,32);

       break;

     case FSF_SCHEDULER_EDF:

       local_scheduler_level = EDFSTAR_register_level(fsf_server_level);

       break;

     case FSF_SCHEDULER_RM:

       local_scheduler_level = RMSTAR_register_level(fsf_server_level);

       break;

     case FSF_SCHEDULER_MPEG:

       local_scheduler_level = MPEGSTAR_register_level(fsf_server_level);

       break;

   }    

  *budget = SERVER_setbudget(fsf_server_level,

                              TIMESPEC2USEC(&(contract->budget_min)),

                              TIMESPEC2USEC(&(contract->period_max)),

                              local_scheduler_level,contract->local_scheduler_id);

  return 0;

}

int adjust_SERVER_budget

   (int budget, const TIME budget_actual,

    const TIME period_actual)

{

  SERVER_adjust_budget(fsf_server_level,

                       budget_actual,

                       period_actual,

                       budget);

  return 0;

}

/* Admission Test function */

int add_contract(const fsf_contract_parameters_t *contract)

{

  return 0;

}

int link_contract_to_server(const fsf_contract_parameters_t *contract,

                            fsf_server_id_t server)

{

  TIME T,Q;

#ifdef FSF_DEBUG

  int temp;

  kern_printf("(Link Server %d)",server);

#endif

  server_list[current].server=server;

  server_list[current].Qs=1;

  T=TIMESPEC2USEC(&contract->period_min);

  Q=TIMESPEC2USEC(&contract->budget_max);

  mul32div32to32(MAX_BANDWIDTH,Q,T,server_list[current].Umax);

  T=TIMESPEC2USEC(&contract->period_max);

  server_list[current].Tmax=T;

  Q=TIMESPEC2USEC(&contract->budget_min);

  server_list[current].Cmin=Q;

  mul32div32to32(MAX_BANDWIDTH,Q,T,server_list[current].Umin);

  server_list[current].U=server_list[current].Umax;

#ifdef FSF_DEBUG

  mul32div32to32(server_list[current].Umax,100, MAX_BANDWIDTH, temp);

  kern_printf("(Umax %d)",temp);

  mul32div32to32(server_list[current].Umin,100, MAX_BANDWIDTH, temp);

  kern_printf("(Umin %d)",temp);

#endif

  current++;

  return 0;

}

int remove_contract(fsf_server_id_t server)

{

  int i=0;

  // find the contract

  while(i<current) {

     if (server_list[i].server==server) break;

     i++;

  }

  // compress the array;

  while (i<(current-1)) {

     server_list[i].server=server_list[i+1].server;

     server_list[i].Umin=server_list[i+1].Umin;

     server_list[i].U=server_list[i+1].Umax;    

     server_list[i].Umax=server_list[i+1].Umax;

     server_list[i].Cmin=server_list[i+1].Cmin;

     server_list[i].Tmax=server_list[i+1].Tmax;

     server_list[i].Qs=server_list[i+1].Qs;

     i++;

  }

  current--;

  return 0;

}

int fsf_negotiate_contract

  (const fsf_contract_parameters_t *contract,

   fsf_server_id_t                 *server)

{

  SYS_FLAGS f;

  int i=0;

  TIME T;

  TIME Q;

  /* Check if contract is initialized */

  if (!contract) return FSF_ERR_NOT_INITIALIZED;

  /* Admission Test */

  if (FSF_ADMISSION_TEST_IS_ENABLED)

    if (add_contract(contract))

      return FSF_ERR_CONTRACT_REJECTED;

  f = kern_fsave();

  /* SERVER => BUDGET */    

  set_SERVER_budget_from_contract(contract,server);

  #ifdef FSF_DEBUG

    kern_printf("(New Server %d)",*server);

  #endif

  if (*server >= 0) {

    link_contract_to_server(contract,*server);

    if (recalculate_contract(fsf_max_bw)==-1)  {

       kern_frestore(f);

       return FSF_ERR_CREATE_SERVER;

    }

#ifdef  FSF_DEBUG

    kern_printf("(Adjust budget)");

#endif    

    for (i=0; i<current; i++) {

       mul32div32to32(MAX_BANDWIDTH,server_list[i].Cmin,server_list[i].U,T);

       #ifdef FSF_DEBUG

       kern_printf("(T %ld)", T);

       #endif

       if (T<=server_list[i].Tmax) {

          server_list[i].actual_budget = server_list[i].Cmin;

          server_list[i].actual_period = T;

          adjust_SERVER_budget(server_list[i].server,server_list[i].Cmin, T);

       } else {

         mul32div32to32(server_list[i].Tmax,server_list[i].U,MAX_BANDWIDTH,Q);

         #ifdef FSF_DEBUG

         kern_printf("(Q %ld)", Q);

         #endif

         server_list[i].U=server_list[i].Umax;

         server_list[i].actual_budget = Q;

         server_list[i].actual_period = server_list[i].Tmax;

         adjust_SERVER_budget(server_list[i].server,Q, server_list[i].Tmax);

       }

    }

  }

  else  {

    kern_frestore(f);

    return FSF_ERR_CREATE_SERVER;

  }

  kern_frestore(f);

  return 0;

}

int fsf_create_thread

  (fsf_server_id_t    server,

   pthread_t         *thread,

   pthread_attr_t    *attr,

   fsf_thread_code_t  thread_code,

   void              *arg,

   void              *local_scheduler_arg)

{

  int local_scheduler_level,scheduler_id;

  #ifdef FSF_DEBUG 

    kern_printf("(FSF:Insert thread = %d to Server = %d)",*thread,server);

  #endif

  /* Check if server and thread exsist */

  if (server == NIL)

    return FSF_ERR_INVALID_SERVER;

  local_scheduler_level = SERVER_get_local_scheduler_level_from_budget(fsf_server_level,server);

  scheduler_id = SERVER_get_local_scheduler_id_from_budget(fsf_server_level,server);

  /* Check if thread is already bind */

  switch (scheduler_id) {

    case FSF_SCHEDULER_POSIX:

      nrt_task_def_arg(*(NRT_TASK_MODEL *)(local_scheduler_arg),arg);

      nrt_task_def_level(*(NRT_TASK_MODEL *)(local_scheduler_arg),local_scheduler_level);

      *thread = task_create("POSIXSTAR", thread_code, local_scheduler_arg, NULL);

      if (*thread == NIL) {

        #ifdef FSF_DEBUG

          kern_printf("(FSF:Error creating thread)");

        #endif

        return FSF_ERR_CREATE_THREAD;

      }

      POSIXSTAR_setbudget(local_scheduler_level, *thread, (int)(server));

    break;

    case FSF_SCHEDULER_EDF:

      hard_task_def_arg(*(HARD_TASK_MODEL *)(local_scheduler_arg),arg);

      hard_task_def_level(*(HARD_TASK_MODEL *)(local_scheduler_arg),local_scheduler_level);

      *thread = task_create("EDFSTAR", thread_code, local_scheduler_arg, NULL);

      if (*thread == NIL)

        return FSF_ERR_CREATE_THREAD;

      EDFSTAR_setbudget(local_scheduler_level, *thread, (int)(server));

      break;

    case FSF_SCHEDULER_RM:

      hard_task_def_arg(*(HARD_TASK_MODEL *)(local_scheduler_arg),arg);

      hard_task_def_level(*(HARD_TASK_MODEL *)(local_scheduler_arg),local_scheduler_level);

      *thread = task_create("RMSTAR", thread_code, local_scheduler_arg, NULL);

      if (*thread == NIL)

        return FSF_ERR_CREATE_THREAD;

      RMSTAR_setbudget(local_scheduler_level, *thread, (int)(server));

      break;

    case FSF_SCHEDULER_MPEG:

      hard_task_def_arg(*(HARD_TASK_MODEL *)(local_scheduler_arg),arg);

      hard_task_def_level(*(HARD_TASK_MODEL *)(local_scheduler_arg),local_scheduler_level);

      *thread = task_create("MPEGSTAR", thread_code, local_scheduler_arg, NULL);

      if (*thread == NIL)

        return FSF_ERR_CREATE_THREAD;

      MPEGSTAR_setbudget(local_scheduler_level, *thread, (int)(server));

      break;

    default:

      return FSF_ERR_INVALID_SERVER;

      break;

  }

  return 0;

}

int fsf_get_server

  (fsf_server_id_t *server,

   pthread_t       thread)

{

  int local_scheduler_level, scheduler_id;

  local_scheduler_level = SERVER_get_local_scheduler_level_from_pid(fsf_server_level,thread);

  scheduler_id = SERVER_get_local_scheduler_id_from_pid(fsf_server_level, thread);

  switch (scheduler_id) {

    case FSF_SCHEDULER_POSIX:  

      return POSIXSTAR_getbudget(local_scheduler_level,thread);

    case FSF_SCHEDULER_EDF:

      return EDFSTAR_getbudget(local_scheduler_level,thread);

    case FSF_SCHEDULER_RM:

      return RMSTAR_getbudget(local_scheduler_level,thread);

    case FSF_SCHEDULER_MPEG:

      return MPEGSTAR_getbudget(local_scheduler_level,thread);

    default:

      return -1;

  }

  return -1;

}

int fsf_get_server_level(void)

{

  return fsf_server_level;

}

int fsf_cancel_contract

  (fsf_server_id_t *server)

{

  int local_scheduler_level, scheduler_id;

  #ifdef FSF_DEBUG

    kern_printf("(Remove server %d)",*server);

  #endif

  /* Check server id */

  if (*server < 0)

    return FSF_ERR_INVALID_SERVER;

  local_scheduler_level = SERVER_get_local_scheduler_level_from_budget(fsf_server_level,*server);

  scheduler_id = SERVER_get_local_scheduler_id_from_budget(fsf_server_level,*server);

  switch (scheduler_id) {

    case FSF_SCHEDULER_POSIX:

      /* Check if some thread use the server */

      if(POSIXSTAR_budget_has_thread(local_scheduler_level,*server))

        return FSF_ERR_SERVER_USED;

      break;

    case FSF_SCHEDULER_EDF:

      /* Check if some thread use the server */

      if(EDFSTAR_budget_has_thread(local_scheduler_level,*server))

        return FSF_ERR_SERVER_USED;

      break;

    case FSF_SCHEDULER_RM:

      /* Check if some thread use the server */

      if(RMSTAR_budget_has_thread(local_scheduler_level,*server))

        return FSF_ERR_SERVER_USED;

      break;

    case FSF_SCHEDULER_MPEG:

      /* Check if some thread use the server */

      if(MPEGSTAR_budget_has_thread(local_scheduler_level,*server))

        return FSF_ERR_SERVER_USED;

      break;

  }

  SERVER_removebudget(fsf_server_level,*server);

  level_free_descriptor(local_scheduler_level);

  remove_contract(*server);

  recalculate_contract(fsf_max_bw);

  *server = -1;

  return 0;

}

int recalculate_contract(bandwidth_t U) {

  long int current_bandwidth,temp_U;

  int        Qt;

  int isok=0;

  int i=0;

  #ifdef FSF_DEBUG

    int temp;

    kern_printf("(Recalculate contract)");

  #endif

  /* The current bandwidth is the min bandwidth */

  //current_bandwidth=SERVER_return_bandwidth(fsf_server_level);

  #ifdef FSF_DEBUG

     kern_printf("(nserver %d)", current);

  #endif  

  do  {

    current_bandwidth=0;

    Qt=0;

    for (i=0; i<current; i++) {

      if (server_list[i].Qs!=0 && server_list[i].U>server_list[i].Umin)

         Qt+=server_list[i].Qs;

       current_bandwidth+=server_list[i].U;

    }

    #ifdef FSF_DEBUG

    kern_printf("(Total Quality %d)", Qt);

    #endif

    isok=1;

    for (i=0; i<current; i++) {

      if (server_list[i].Qs!=0 && server_list[i].U>server_list[i].Umin) {

        temp_U=server_list[i].U;

        temp_U=temp_U-(current_bandwidth-U)*server_list[i].Qs/Qt;

        if (temp_U<server_list[i].Umin) {

           server_list[i].U=server_list[i].Umin;

           isok=0;

        } else if (temp_U>=server_list[i].Umax)  {

           server_list[i].U=server_list[i].Umax;

        } else server_list[i].U=temp_U;

#ifdef FSF_DEBUG

        mul32div32to32(server_list[i].U,100, MAX_BANDWIDTH, temp);

        kern_printf("(Server %d bw %d)", server_list[i].server, temp);

#endif 

      }

    }  

  } while (!isok);

 return 0;

}

int fsf_renegotiate_contract

  (const fsf_contract_parameters_t *new_contract,

   fsf_server_id_t server)

{

  SYS_FLAGS f;

  #ifdef FSF_DEBUG

    kern_printf("(Renegotiate for server %d)",server);

  #endif

  if (!new_contract)

    return FSF_ERR_NOT_INITIALIZED;

  if (server < 0)

    return FSF_ERR_INVALID_SERVER;

  // compute the new value

  //

   f = kern_fsave();

   if (recalculate_contract(fsf_max_bw)==-1)  {

       kern_frestore(f);

       return FSF_ERR_CREATE_SERVER;

   }

   kern_frestore(f);

   return 0;

}

void print_server_list()

{

  int i;

  kern_printf("Server List\n");

  for(i=0;i<current;i++) {

    kern_printf("[%d] Q:%d T:%d\n",server_list[i].server,(int)server_list[i].actual_budget,(int)server_list[i].actual_period);

  }

}