kernel/system/do_sprofile.c

   1 /* The kernel call that is implemented in this file:
   2  *   m_type:    SYS_SPROFILE
   3  *
   4  * The parameters for this kernel call are:
   5  *    m7_i1:    PROF_ACTION       (start/stop profiling)
   6  *    m7_i2:    PROF_MEM_SIZE     (available memory for data)
   7  *    m7_i3:    PROF_FREQ         (requested sample frequency)
   8  *    m7_i4:    PROF_ENDPT        (endpoint of caller)
   9  *    m7_p1:    PROF_CTL_PTR      (location of info struct)
  10  *    m7_p2:    PROF_MEM_PTR      (location of memory for data)
  11  *
  12  * Changes:
  13  *   14 Aug, 2006   Created (Rogier Meurs)
  14  */
  15
  16 #include "kernel/system.h"
  17 #include "kernel/watchdog.h"
  18
  19 #if SPROFILE
  20
  21 /* user address to write info struct */
  22 static vir_bytes sprof_info_addr_vir;
  23
  24 static void clean_seen_flag(void)
  25 {
  26         int i;
  27
  28         for (i = 0; i < NR_TASKS + NR_PROCS; i++)
  29                 proc[i].p_misc_flags &= ~MF_SPROF_SEEN;
  30 }
  31
  32 /*===========================================================================*
  33  *                              do_sprofile                                  *
  34  *===========================================================================*/
  35 int do_sprofile(struct proc * caller, message * m_ptr)
  36 {
  37   int proc_nr;
  38   int err;
  39
  40   switch(m_ptr->PROF_ACTION) {
  41
  42   case PROF_START:
  43         /* Starting profiling.
  44          *
  45          * Check if profiling is not already running.  Calculate physical
  46          * addresses of user pointers.  Reset counters.  Start CMOS timer.
  47          * Turn on profiling.
  48          */
  49         if (sprofiling) {
  50                 printf("SYSTEM: start s-profiling: already started\n");
  51                 return EBUSY;
  52         }
  53
  54         /* Test endpoint number. */
  55         if(!isokendpt(m_ptr->PROF_ENDPT, &proc_nr))
  56                 return EINVAL;
  57
  58         /* Set parameters for statistical profiler. */
  59         sprof_ep = m_ptr->PROF_ENDPT;
  60         sprof_info_addr_vir = (vir_bytes) m_ptr->PROF_CTL_PTR;
  61         sprof_data_addr_vir = (vir_bytes) m_ptr->PROF_MEM_PTR;
  62
  63         sprof_info.mem_used = 0;
  64         sprof_info.total_samples = 0;
  65         sprof_info.idle_samples = 0;
  66         sprof_info.system_samples = 0;
  67         sprof_info.user_samples = 0;
  68
  69         sprof_mem_size = m_ptr->PROF_MEM_SIZE < SAMPLE_BUFFER_SIZE ?
  70                                 m_ptr->PROF_MEM_SIZE : SAMPLE_BUFFER_SIZE;
  71
  72         switch (sprofiling_type = m_ptr->PROF_INTR_TYPE) {
  73                 case PROF_RTC:
  74                         init_profile_clock(m_ptr->PROF_FREQ);
  75                         break;
  76                 case PROF_NMI:
  77                         err = nmi_watchdog_start_profiling(m_ptr->PROF_FREQ);
  78                         if (err)
  79                                 return err;
  80                         break;
  81                 default:
  82                         printf("ERROR : unknown profiling interrupt type\n");
  83                         return EINVAL;
  84         }
  85
  86         sprofiling = 1;
  87
  88         clean_seen_flag();
  89
  90         return OK;
  91
  92   case PROF_STOP:
  93         /* Stopping profiling.
  94          *
  95          * Check if profiling is indeed running.  Turn off profiling.
  96          * Stop CMOS timer.  Copy info struct to user process.
  97          */
  98         if (!sprofiling) {
  99                 printf("SYSTEM: stop s-profiling: not started\n");
 100                 return EBUSY;
 101         }
 102
 103         sprofiling = 0;
 104
 105         switch (sprofiling_type) {
 106                 case PROF_RTC:
 107                         stop_profile_clock();
 108                         break;
 109                 case PROF_NMI:
 110                         nmi_watchdog_stop_profiling();
 111                         break;
 112         }
 113
 114         data_copy(KERNEL, (vir_bytes) &sprof_info,
 115                 sprof_ep, sprof_info_addr_vir, sizeof(sprof_info));
 116         data_copy(KERNEL, (vir_bytes) sprof_sample_buffer,
 117                 sprof_ep, sprof_data_addr_vir, sprof_info.mem_used);
 118
 119         clean_seen_flag();
 120
 121         return OK;
 122
 123   default:
 124         return EINVAL;
 125   }
 126 }
 127
 128 #endif /* SPROFILE */
 129