perf powerpc: Process the DTL entries in queue and deliver samples

Create samples from DTL entries for displaying in 'perf report'
and 'perf script'.

When the different PERF_RECORD_XX records are processed from perf
session, powerpc_vpadtl_process_event() will be invoked.

For each of the PERF_RECORD_XX record, compare the timestamp of perf
record with timestamp of top element in the auxtrace heap.

Process the auxtrace queue if the timestamp of element from heap is
lower than timestamp from entry in perf record.

Sometimes it could happen that one buffer is only partially processed.

if the timestamp of occurrence of another event is more than currently
processed element in the queue, it will move on to next perf record.

So keep track of position of buffer to continue processing next time.

Update the timestamp of the auxtrace heap with the timestamp of last
processed entry from the auxtrace buffer.

Generate perf sample for each entry in the dispatch trace log.

Fill in the sample details:
- sample ip is picked from srr0 field of dtl_entry
- sample cpu is picked from processor_id of dtl_entry
- sample id is from sample_id of powerpc_vpadtl
- cpumode is set to PERF_RECORD_MISC_KERNEL
- Additionally save the details in raw_data of sample.

This is to print the relevant fields in perf_sample__fprintf_synth()
when called from builtin-script

The sample is processed by calling perf_session__deliver_synth_event()
so that it gets included in perf report.

Sample Output:

  ./perf record -a -e sched:*,vpa_dtl/dtl_all/ -c 1000000000 sleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.300 MB perf.data ]

  ./perf report

  # Samples: 321  of event 'vpa-dtl'
  # Event count (approx.): 321
  #
  # Children      Self  Command  Shared Object      Symbol
  # ........  ........  .......  .................  ..............................
  #
     100.00%   100.00%  swapper  [kernel.kallsyms]  [k] plpar_hcall_norets_notrace

Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Tested-by: Tejas Manhas <tejas05@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Cc: Aboorva Devarajan <aboorvad@linux.ibm.com>
Cc: Aditya Bodkhe <Aditya.Bodkhe1@ibm.com>
Cc: Hari Bathini <hbathini@linux.vnet.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/powerpc-vpadtl.c b/tools/perf/util/powerpc-vpadtl.c
index 1000fbc7a74bec4b4624b96da3825122130c01e0..39a3fb3f1330136f81723736adaf87754080bdda 100644 (file)
--- a/tools/perf/util/powerpc-vpadtl.c
+++ b/tools/perf/util/powerpc-vpadtl.c
@@ -167,6 +167,44 @@ static void powerpc_vpadtl_dump_event(struct powerpc_vpadtl *vpa, unsigned char
        powerpc_vpadtl_dump(vpa, buf, len);
 }
 
+/*
+ * Generate perf sample for each entry in the dispatch trace log.
+ *   - sample ip is picked from srr0 field of powerpc_vpadtl_entry
+ *   - sample cpu is logical cpu.
+ *   - cpumode is set to PERF_RECORD_MISC_KERNEL
+ *   - Additionally save the details in raw_data of sample. This
+ *   is to print the relevant fields in perf_sample__fprintf_synth()
+ *   when called from builtin-script
+ */
+static int powerpc_vpadtl_sample(struct powerpc_vpadtl_entry *record,
+               struct powerpc_vpadtl *vpa, u64 save, int cpu)
+{
+       struct perf_sample sample;
+       union perf_event event;
+
+       sample.ip = be64_to_cpu(record->srr0);
+       sample.period = 1;
+       sample.cpu = cpu;
+       sample.id = vpa->sample_id;
+       sample.callchain = NULL;
+       sample.branch_stack = NULL;
+       memset(&event, 0, sizeof(event));
+       sample.cpumode = PERF_RECORD_MISC_KERNEL;
+       sample.time = save;
+       sample.raw_data = record;
+       sample.raw_size = sizeof(record);
+       event.sample.header.type = PERF_RECORD_SAMPLE;
+       event.sample.header.misc = sample.cpumode;
+       event.sample.header.size = sizeof(struct perf_event_header);
+
+       if (perf_session__deliver_synth_event(vpa->session, &event, &sample)) {
+               pr_debug("Failed to create sample for dtl entry\n");
+               return -1;
+       }
+
+       return 0;
+}
+
 static int powerpc_vpadtl_get_buffer(struct powerpc_vpadtl_queue *vpaq)
 {
        struct auxtrace_buffer *buffer = vpaq->buffer;
@@ -240,6 +278,141 @@ static int powerpc_vpadtl_decode(struct powerpc_vpadtl_queue *vpaq)
        return 1;
 }
 
+static int powerpc_vpadtl_decode_all(struct powerpc_vpadtl_queue *vpaq)
+{
+       int ret;
+       unsigned char *buf;
+
+       if (!vpaq->buf_len || vpaq->pkt_len == vpaq->size) {
+               ret = powerpc_vpadtl_get_buffer(vpaq);
+               if (ret <= 0)
+                       return ret;
+       }
+
+       if (vpaq->buffer) {
+               buf = vpaq->buffer->data;
+               buf += vpaq->pkt_len;
+               vpaq->dtl = (struct powerpc_vpadtl_entry *)buf;
+               if ((long long)be64_to_cpu(vpaq->dtl->timebase) <= 0) {
+                       if (vpaq->pkt_len != dtl_entry_size && vpaq->buf_len) {
+                               vpaq->pkt_len += dtl_entry_size;
+                               vpaq->buf_len -= dtl_entry_size;
+                       }
+                       return -1;
+               }
+               vpaq->pkt_len += dtl_entry_size;
+               vpaq->buf_len -= dtl_entry_size;
+       } else {
+               return 0;
+       }
+
+       return 1;
+}
+
+static int powerpc_vpadtl_run_decoder(struct powerpc_vpadtl_queue *vpaq, u64 *timestamp)
+{
+       struct powerpc_vpadtl *vpa = vpaq->vpa;
+       struct powerpc_vpadtl_entry *record;
+       int ret;
+       unsigned long long vpaq_timestamp;
+
+       while (1) {
+               ret = powerpc_vpadtl_decode_all(vpaq);
+               if (!ret) {
+                       pr_debug("All data in the queue has been processed.\n");
+                       return 1;
+               }
+
+               /*
+                * Error is detected when decoding VPA PMU trace. Continue to
+                * the next trace data and find out more dtl entries.
+                */
+               if (ret < 0)
+                       continue;
+
+               record = vpaq->dtl;
+
+               vpaq_timestamp = powerpc_vpadtl_timestamp(vpaq);
+
+               /* Update timestamp for the last record */
+               if (vpaq_timestamp > vpaq->timestamp)
+                       vpaq->timestamp = vpaq_timestamp;
+
+               /*
+                * If the timestamp of the queue is later than timestamp of the
+                * coming perf event, bail out so can allow the perf event to
+                * be processed ahead.
+                */
+               if (vpaq->timestamp >= *timestamp) {
+                       *timestamp = vpaq->timestamp;
+                       vpaq->pkt_len -= dtl_entry_size;
+                       vpaq->buf_len += dtl_entry_size;
+                       return 0;
+               }
+
+               ret = powerpc_vpadtl_sample(record, vpa, vpaq_timestamp, vpaq->cpu);
+               if (ret)
+                       continue;
+       }
+       return 0;
+}
+
+/*
+ * For each of the PERF_RECORD_XX record, compare the timestamp
+ * of perf record with timestamp of top element in the auxtrace heap.
+ * Process the auxtrace queue if the timestamp of element from heap is
+ * lower than timestamp from entry in perf record.
+ *
+ * Update the timestamp of the auxtrace heap with the timestamp
+ * of last processed entry from the auxtrace buffer.
+ */
+static int powerpc_vpadtl_process_queues(struct powerpc_vpadtl *vpa, u64 timestamp)
+{
+       unsigned int queue_nr;
+       u64 ts;
+       int ret;
+
+       while (1) {
+               struct auxtrace_queue *queue;
+               struct powerpc_vpadtl_queue *vpaq;
+
+               if (!vpa->heap.heap_cnt)
+                       return 0;
+
+               if (vpa->heap.heap_array[0].ordinal >= timestamp)
+                       return 0;
+
+               queue_nr = vpa->heap.heap_array[0].queue_nr;
+               queue = &vpa->queues.queue_array[queue_nr];
+               vpaq = queue->priv;
+
+               auxtrace_heap__pop(&vpa->heap);
+
+               if (vpa->heap.heap_cnt) {
+                       ts = vpa->heap.heap_array[0].ordinal + 1;
+                       if (ts > timestamp)
+                               ts = timestamp;
+               } else {
+                       ts = timestamp;
+               }
+
+               ret = powerpc_vpadtl_run_decoder(vpaq, &ts);
+               if (ret < 0) {
+                       auxtrace_heap__add(&vpa->heap, queue_nr, ts);
+                       return ret;
+               }
+
+               if (!ret) {
+                       ret = auxtrace_heap__add(&vpa->heap, queue_nr, ts);
+                       if (ret < 0)
+                               return ret;
+               } else {
+                       vpaq->on_heap = false;
+               }
+       }
+       return 0;
+}
+
 static struct powerpc_vpadtl_queue *powerpc_vpadtl__alloc_queue(struct powerpc_vpadtl *vpa,
                                                unsigned int queue_nr)
 {
@@ -353,6 +526,8 @@ static int powerpc_vpadtl_process_event(struct perf_session *session,
                err = powerpc_vpadtl__update_queues(vpa);
                if (err)
                        return err;
+
+               err = powerpc_vpadtl_process_queues(vpa, sample->time);
        }
 
        return err;