tools/perf/util/arm-spe.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Arm Statistical Profiling Extensions (SPE) support
   4  * Copyright (c) 2017-2018, Arm Ltd.
   5  */
   6
   7 #include <endian.h>
   8 #include <errno.h>
   9 #include <byteswap.h>
  10 #include <inttypes.h>
  11 #include <unistd.h>
  12 #include <stdlib.h>
  13 #include <linux/kernel.h>
  14 #include <linux/types.h>
  15 #include <linux/bitops.h>
  16 #include <linux/log2.h>
  17 #include <linux/zalloc.h>
  18
  19 #include "cpumap.h"
  20 #include "color.h"
  21 #include "evsel.h"
  22 #include "machine.h"
  23 #include "session.h"
  24 #include "debug.h"
  25 #include "auxtrace.h"
  26 #include "arm-spe.h"
  27 #include "arm-spe-pkt-decoder.h"
  28
  29 struct arm_spe {
  30         struct auxtrace                 auxtrace;
  31         struct auxtrace_queues          queues;
  32         struct auxtrace_heap            heap;
  33         u32                             auxtrace_type;
  34         struct perf_session             *session;
  35         struct machine                  *machine;
  36         u32                             pmu_type;
  37 };
  38
  39 struct arm_spe_queue {
  40         struct arm_spe          *spe;
  41         unsigned int            queue_nr;
  42         struct auxtrace_buffer  *buffer;
  43         bool                    on_heap;
  44         bool                    done;
  45         pid_t                   pid;
  46         pid_t                   tid;
  47         int                     cpu;
  48 };
  49
  50 static void arm_spe_dump(struct arm_spe *spe __maybe_unused,
  51                          unsigned char *buf, size_t len)
  52 {
  53         struct arm_spe_pkt packet;
  54         size_t pos = 0;
  55         int ret, pkt_len, i;
  56         char desc[ARM_SPE_PKT_DESC_MAX];
  57         const char *color = PERF_COLOR_BLUE;
  58
  59         color_fprintf(stdout, color,
  60                       ". ... ARM SPE data: size %zu bytes\n",
  61                       len);
  62
  63         while (len) {
  64                 ret = arm_spe_get_packet(buf, len, &packet);
  65                 if (ret > 0)
  66                         pkt_len = ret;
  67                 else
  68                         pkt_len = 1;
  69                 printf(".");
  70                 color_fprintf(stdout, color, "  %08x: ", pos);
  71                 for (i = 0; i < pkt_len; i++)
  72                         color_fprintf(stdout, color, " %02x", buf[i]);
  73                 for (; i < 16; i++)
  74                         color_fprintf(stdout, color, "   ");
  75                 if (ret > 0) {
  76                         ret = arm_spe_pkt_desc(&packet, desc,
  77                                                ARM_SPE_PKT_DESC_MAX);
  78                         if (ret > 0)
  79                                 color_fprintf(stdout, color, " %s\n", desc);
  80                 } else {
  81                         color_fprintf(stdout, color, " Bad packet!\n");
  82                 }
  83                 pos += pkt_len;
  84                 buf += pkt_len;
  85                 len -= pkt_len;
  86         }
  87 }
  88
  89 static void arm_spe_dump_event(struct arm_spe *spe, unsigned char *buf,
  90                                size_t len)
  91 {
  92         printf(".\n");
  93         arm_spe_dump(spe, buf, len);
  94 }
  95
  96 static int arm_spe_process_event(struct perf_session *session __maybe_unused,
  97                                  union perf_event *event __maybe_unused,
  98                                  struct perf_sample *sample __maybe_unused,
  99                                  struct perf_tool *tool __maybe_unused)
 100 {
 101         return 0;
 102 }
 103
 104 static int arm_spe_process_auxtrace_event(struct perf_session *session,
 105                                           union perf_event *event,
 106                                           struct perf_tool *tool __maybe_unused)
 107 {
 108         struct arm_spe *spe = container_of(session->auxtrace, struct arm_spe,
 109                                              auxtrace);
 110         struct auxtrace_buffer *buffer;
 111         off_t data_offset;
 112         int fd = perf_data__fd(session->data);
 113         int err;
 114
 115         if (perf_data__is_pipe(session->data)) {
 116                 data_offset = 0;
 117         } else {
 118                 data_offset = lseek(fd, 0, SEEK_CUR);
 119                 if (data_offset == -1)
 120                         return -errno;
 121         }
 122
 123         err = auxtrace_queues__add_event(&spe->queues, session, event,
 124                                          data_offset, &buffer);
 125         if (err)
 126                 return err;
 127
 128         /* Dump here now we have copied a piped trace out of the pipe */
 129         if (dump_trace) {
 130                 if (auxtrace_buffer__get_data(buffer, fd)) {
 131                         arm_spe_dump_event(spe, buffer->data,
 132                                              buffer->size);
 133                         auxtrace_buffer__put_data(buffer);
 134                 }
 135         }
 136
 137         return 0;
 138 }
 139
 140 static int arm_spe_flush(struct perf_session *session __maybe_unused,
 141                          struct perf_tool *tool __maybe_unused)
 142 {
 143         return 0;
 144 }
 145
 146 static void arm_spe_free_queue(void *priv)
 147 {
 148         struct arm_spe_queue *speq = priv;
 149
 150         if (!speq)
 151                 return;
 152         free(speq);
 153 }
 154
 155 static void arm_spe_free_events(struct perf_session *session)
 156 {
 157         struct arm_spe *spe = container_of(session->auxtrace, struct arm_spe,
 158                                              auxtrace);
 159         struct auxtrace_queues *queues = &spe->queues;
 160         unsigned int i;
 161
 162         for (i = 0; i < queues->nr_queues; i++) {
 163                 arm_spe_free_queue(queues->queue_array[i].priv);
 164                 queues->queue_array[i].priv = NULL;
 165         }
 166         auxtrace_queues__free(queues);
 167 }
 168
 169 static void arm_spe_free(struct perf_session *session)
 170 {
 171         struct arm_spe *spe = container_of(session->auxtrace, struct arm_spe,
 172                                              auxtrace);
 173
 174         auxtrace_heap__free(&spe->heap);
 175         arm_spe_free_events(session);
 176         session->auxtrace = NULL;
 177         free(spe);
 178 }
 179
 180 static const char * const arm_spe_info_fmts[] = {
 181         [ARM_SPE_PMU_TYPE]              = "  PMU Type           %"PRId64"\n",
 182 };
 183
 184 static void arm_spe_print_info(__u64 *arr)
 185 {
 186         if (!dump_trace)
 187                 return;
 188
 189         fprintf(stdout, arm_spe_info_fmts[ARM_SPE_PMU_TYPE], arr[ARM_SPE_PMU_TYPE]);
 190 }
 191
 192 int arm_spe_process_auxtrace_info(union perf_event *event,
 193                                   struct perf_session *session)
 194 {
 195         struct perf_record_auxtrace_info *auxtrace_info = &event->auxtrace_info;
 196         size_t min_sz = sizeof(u64) * ARM_SPE_PMU_TYPE;
 197         struct arm_spe *spe;
 198         int err;
 199
 200         if (auxtrace_info->header.size < sizeof(struct perf_record_auxtrace_info) +
 201                                         min_sz)
 202                 return -EINVAL;
 203
 204         spe = zalloc(sizeof(struct arm_spe));
 205         if (!spe)
 206                 return -ENOMEM;
 207
 208         err = auxtrace_queues__init(&spe->queues);
 209         if (err)
 210                 goto err_free;
 211
 212         spe->session = session;
 213         spe->machine = &session->machines.host; /* No kvm support */
 214         spe->auxtrace_type = auxtrace_info->type;
 215         spe->pmu_type = auxtrace_info->priv[ARM_SPE_PMU_TYPE];
 216
 217         spe->auxtrace.process_event = arm_spe_process_event;
 218         spe->auxtrace.process_auxtrace_event = arm_spe_process_auxtrace_event;
 219         spe->auxtrace.flush_events = arm_spe_flush;
 220         spe->auxtrace.free_events = arm_spe_free_events;
 221         spe->auxtrace.free = arm_spe_free;
 222         session->auxtrace = &spe->auxtrace;
 223
 224         arm_spe_print_info(&auxtrace_info->priv[0]);
 225
 226         return 0;
 227
 228 err_free:
 229         free(spe);
 230         return err;
 231 }