drivers/scsi/bfa/bfa_timer.c

   1 /*
   2  * Copyright (c) 2005-2009 Brocade Communications Systems, Inc.
   3  * All rights reserved
   4  * www.brocade.com
   5  *
   6  * Linux driver for Brocade Fibre Channel Host Bus Adapter.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License (GPL) Version 2 as
  10  * published by the Free Software Foundation
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 #include <bfa_timer.h>
  19 #include <cs/bfa_debug.h>
  20
  21 void
  22 bfa_timer_init(struct bfa_timer_mod_s *mod)
  23 {
  24         INIT_LIST_HEAD(&mod->timer_q);
  25 }
  26
  27 void
  28 bfa_timer_beat(struct bfa_timer_mod_s *mod)
  29 {
  30         struct list_head        *qh = &mod->timer_q;
  31         struct list_head        *qe, *qe_next;
  32         struct bfa_timer_s *elem;
  33         struct list_head         timedout_q;
  34
  35         INIT_LIST_HEAD(&timedout_q);
  36
  37         qe = bfa_q_next(qh);
  38
  39         while (qe != qh) {
  40                 qe_next = bfa_q_next(qe);
  41
  42                 elem = (struct bfa_timer_s *) qe;
  43                 if (elem->timeout <= BFA_TIMER_FREQ) {
  44                         elem->timeout = 0;
  45                         list_del(&elem->qe);
  46                         list_add_tail(&elem->qe, &timedout_q);
  47                 } else {
  48                         elem->timeout -= BFA_TIMER_FREQ;
  49                 }
  50
  51                 qe = qe_next;   /* go to next elem */
  52         }
  53
  54         /*
  55          * Pop all the timeout entries
  56          */
  57         while (!list_empty(&timedout_q)) {
  58                 bfa_q_deq(&timedout_q, &elem);
  59                 elem->timercb(elem->arg);
  60         }
  61 }
  62
  63 /**
  64  * Should be called with lock protection
  65  */
  66 void
  67 bfa_timer_begin(struct bfa_timer_mod_s *mod, struct bfa_timer_s *timer,
  68                     void (*timercb) (void *), void *arg, unsigned int timeout)
  69 {
  70
  71         bfa_assert(timercb != NULL);
  72         bfa_assert(!bfa_q_is_on_q(&mod->timer_q, timer));
  73
  74         timer->timeout = timeout;
  75         timer->timercb = timercb;
  76         timer->arg = arg;
  77
  78         list_add_tail(&timer->qe, &mod->timer_q);
  79 }
  80
  81 /**
  82  * Should be called with lock protection
  83  */
  84 void
  85 bfa_timer_stop(struct bfa_timer_s *timer)
  86 {
  87         bfa_assert(!list_empty(&timer->qe));
  88
  89         list_del(&timer->qe);
  90 }