The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/rmi/perfmon.h

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    1 /*-
    2  * Copyright (c) 2003-2009 RMI Corporation
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of RMI Corporation, nor the names of its contributors,
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * RMI_BSD */
   30 
   31 #ifndef PERFMON_H
   32 #define PERFMON_H
   33 
   34 #include <mips/rmi/perfmon_xlrconfig.h>
   35 
   36 /*
   37  * category events reported by the perfmon library
   38  */
   39 enum event_category_t {
   40         PERF_CP0_COUNTER = 1, PERF_CP2_CREDITS, PERF_L2_COUNTER,
   41         PERF_SBC_COUNTER, PERF_SBC_CREDITS, PERF_GMAC0_COUNTER, PERF_GMAC1_COUNTER,
   42         PERF_GMAC2_COUNTER, PERF_GMAC_STAT_COM, PERF_GMAC_STAT_TX,
   43 PERF_GMAC_STAT_RX, PERF_DRAM_COUNTER, PERF_PARAMETER_CONF = 127};
   44 
   45 
   46 enum perf_param_t {
   47         PERF_CPU_SAMPLING_INTERVAL, PERF_SYS_SAMPLING_INTERVAL, PERF_CC_SAMPLE_RATE, PERF_CP0_FLAGS
   48 };
   49 
   50 #define CPO_EVENTS_TEMPLATE  0x06       /* enable kernel and user events */
   51 
   52 #define PERFMON_ACTIVE_MAGIC 0xc001
   53 #define PERFMON_ENABLED_MAGIC 0xb007
   54 #define PERFMON_INITIAL_GENERATION 0x0101
   55 
   56 #define PERFMON_SERVER_PORT 7007
   57 
   58 enum system_bridge_credits_t {
   59         PCIX_CREDITS, HT_CREDITS, GIO_CREDITS, OTHER_CREDITS
   60 };
   61 
   62 struct perf_config_data {
   63         uint16_t magic;         /* monitor start when this is initialized */
   64         uint16_t generation;    /* incremented when the config changes */
   65         uint16_t flags;
   66         uint16_t cc_sample_rate;/* rate at which credit counters are sampled
   67                                  * relative to sampling_rate */
   68         uint32_t sampling_rate; /* rate at which events are sampled */
   69         uint32_t cc_register_mask;      /* credit counters registers to be
   70                                          * sampled */
   71         uint64_t events[NTHREADS];      /* events bitmap for each thread */
   72 };
   73 
   74 struct perf_sample {
   75         uint32_t counter;
   76         uint32_t timestamp;
   77         uint32_t sample_tag;
   78         uint32_t duration;
   79 };
   80 
   81 struct sample_q {
   82         int32_t head, tail;
   83         struct perf_sample samples[PERF_SAMPLE_BUFSZ];
   84         uint32_t overflows;
   85 };
   86 
   87 struct perf_area {
   88         struct perf_config_data perf_config;
   89         struct sample_q sample_fifo;
   90 };
   91 
   92 /*
   93  * We have a shared location to keep a global tick counter for all the
   94  * CPUS  - TODO is this optimal? effect on cache?
   95  */
   96 extern uint32_t *xlr_perfmon_timer_loc;
   97 
   98 #define PERFMON_TIMESTAMP_LOC (xlr_perfmon_timer_loc)
   99 
  100 static __inline__ uint32_t 
  101 perfmon_timestamp_get(void)
  102 {
  103         return *PERFMON_TIMESTAMP_LOC;
  104 }
  105 
  106 static __inline__ void 
  107 perfmon_timestamp_set(uint32_t val)
  108 {
  109         *PERFMON_TIMESTAMP_LOC = val;
  110 }
  111 
  112 static __inline__ void 
  113 perfmon_timestamp_incr(int val)
  114 {
  115         (*PERFMON_TIMESTAMP_LOC) += val;
  116 }
  117 
  118 static __inline__ void 
  119 send_sample_gts(uint32_t tag, uint32_t value, uint32_t td)
  120 {
  121         xlr_send_sample(tag, value, perfmon_timestamp_get(), td);
  122 }
  123 
  124 /*
  125  * Simple FIFO, one producer - one consumer - circlar queue - no locking
  126  */
  127 
  128 static __inline__ void 
  129 init_fifo(struct sample_q *q)
  130 {
  131         q->head = q->tail = 0;
  132 }
  133 
  134 static __inline__ void 
  135 put_sample(struct sample_q *q, uint32_t sample_tag, uint32_t counter,
  136     uint32_t duration)
  137 {
  138         uint32_t timestamp = perfmon_timestamp_get();
  139         int new_tail = (q->tail + 1) % PERF_SAMPLE_BUFSZ;
  140 
  141         if (q->head == new_tail) {
  142                 q->overflows++;
  143                 return;
  144         }
  145         q->samples[new_tail].sample_tag = sample_tag;
  146         q->samples[new_tail].counter = counter;
  147         q->samples[new_tail].timestamp = timestamp;
  148         q->samples[new_tail].duration = duration;
  149 
  150         q->tail = new_tail;
  151 }
  152 
  153 static __inline__ int 
  154 get_sample(struct sample_q *q, uint32_t * sample_tag, uint32_t * counter,
  155     uint32_t * timestamp, uint32_t * duration)
  156 {
  157         int head = q->head;
  158 
  159         if (head == q->tail)
  160                 return 0;
  161         *sample_tag = q->samples[head].sample_tag;
  162         *counter = q->samples[head].counter;
  163         *timestamp = q->samples[head].timestamp;
  164         *duration = q->samples[head].duration;
  165 
  166         q->head = (head + 1) % PERF_SAMPLE_BUFSZ;
  167         return 1;
  168 }
  169 
  170 static __inline__ void 
  171 clear_queue(struct sample_q *q)
  172 {
  173         q->head = q->tail;
  174 }
  175 void xlr_perfmon_init_cpu(void *);
  176 void xlr_perfmon_sampler(void *);
  177 void log_active_core(int core);
  178 int get_start_generation(void);
  179 
  180 void xlr_perfmon_clockhandler(void);
  181 extern int xlr_perfmon_started;
  182 
  183 #endif                          /* PERFMON_H */

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