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Subject[PATCH 09/44] perf report: Add GUI report support for s390 auxiliary trace
Date
From: Thomas Richter <tmricht@linux.ibm.com>

Add support for s390 auxiliary trace support.

Use 'perf record -e rbd000 -- ls' to create the perf.data file.

Use 'perf report' to display the auxiliary trace data.

Output before:

[root@s35lp76 perf]# ./perf report --stdio
0x128 [0x10]: failed to process type: 70
Error:
failed to process sample
[root@s35lp76 perf]#

Output after:

[root@s35lp76 perf]# ./perf report --stdio

18.21% 18.21% ls [kernel.kallsyms] [k] ftrace_likely_update
9.52% 9.52% ls [kernel.kallsyms] [k] lock_acquire
9.38% 9.38% ls [kernel.kallsyms] [k] lock_release
3.45% 3.45% ls [kernel.kallsyms] [k] lock_acquired
2.88% 2.88% ls [kernel.kallsyms] [k] link_path_walk
2.63% 2.63% ls [kernel.kallsyms] [k] __d_lookup
2.38% 2.38% ls [kernel.kallsyms] [k] __d_lookup_rcu
2.04% 2.04% ls [kernel.kallsyms] [k] ___might_sleep
1.83% 1.83% ls [kernel.kallsyms] [k] debug_lockdep_rcu_enabled
1.44% 1.44% ls [kernel.kallsyms] [k] dput
....

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Link: http://lkml.kernel.org/r/20180802074622.13641-4-tmricht@linux.ibm.com
[ Use PRI[xd]64 to fix the build on debian:experimental-x-mips (gcc 8.1.0) and others ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/s390-cpumsf.c | 593 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 585 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/s390-cpumsf.c b/tools/perf/util/s390-cpumsf.c
index 14728b0834c6..d2c78ffd9fee 100644
--- a/tools/perf/util/s390-cpumsf.c
+++ b/tools/perf/util/s390-cpumsf.c
@@ -4,6 +4,138 @@
* Auxtrace support for s390 CPU-Measurement Sampling Facility
*
* Author(s): Thomas Richter <tmricht@linux.ibm.com>
+ *
+ * Auxiliary traces are collected during 'perf record' using rbd000 event.
+ * Several PERF_RECORD_XXX are generated during recording:
+ *
+ * PERF_RECORD_AUX:
+ * Records that new data landed in the AUX buffer part.
+ * PERF_RECORD_AUXTRACE:
+ * Defines auxtrace data. Followed by the actual data. The contents of
+ * the auxtrace data is dependent on the event and the CPU.
+ * This record is generated by perf record command. For details
+ * see Documentation/perf.data-file-format.txt.
+ * PERF_RECORD_AUXTRACE_INFO:
+ * Defines a table of contains for PERF_RECORD_AUXTRACE records. This
+ * record is generated during 'perf record' command. Each record contains up
+ * to 256 entries describing offset and size of the AUXTRACE data in the
+ * perf.data file.
+ * PERF_RECORD_AUXTRACE_ERROR:
+ * Indicates an error during AUXTRACE collection such as buffer overflow.
+ * PERF_RECORD_FINISHED_ROUND:
+ * Perf events are not necessarily in time stamp order, as they can be
+ * collected in parallel on different CPUs. If the events should be
+ * processed in time order they need to be sorted first.
+ * Perf report guarantees that there is no reordering over a
+ * PERF_RECORD_FINISHED_ROUND boundary event. All perf records with a
+ * time stamp lower than this record are processed (and displayed) before
+ * the succeeding perf record are processed.
+ *
+ * These records are evaluated during perf report command.
+ *
+ * 1. PERF_RECORD_AUXTRACE_INFO is used to set up the infrastructure for
+ * auxiliary trace data processing. See s390_cpumsf_process_auxtrace_info()
+ * below.
+ * Auxiliary trace data is collected per CPU. To merge the data into the report
+ * an auxtrace_queue is created for each CPU. It is assumed that the auxtrace
+ * data is in ascending order.
+ *
+ * Each queue has a double linked list of auxtrace_buffers. This list contains
+ * the offset and size of a CPU's auxtrace data. During auxtrace processing
+ * the data portion is mmap()'ed.
+ *
+ * To sort the queues in chronological order, all queue access is controlled
+ * by the auxtrace_heap. This is basicly a stack, each stack element has two
+ * entries, the queue number and a time stamp. However the stack is sorted by
+ * the time stamps. The highest time stamp is at the bottom the lowest
+ * (nearest) time stamp is at the top. That sort order is maintained at all
+ * times!
+ *
+ * After the auxtrace infrastructure has been setup, the auxtrace queues are
+ * filled with data (offset/size pairs) and the auxtrace_heap is populated.
+ *
+ * 2. PERF_RECORD_XXX processing triggers access to the auxtrace_queues.
+ * Each record is handled by s390_cpumsf_process_event(). The time stamp of
+ * the perf record is compared with the time stamp located on the auxtrace_heap
+ * top element. If that time stamp is lower than the time stamp from the
+ * record sample, the auxtrace queues will be processed. As auxtrace queues
+ * control many auxtrace_buffers and each buffer can be quite large, the
+ * auxtrace buffer might be processed only partially. In this case the
+ * position in the auxtrace_buffer of that queue is remembered and the time
+ * stamp of the last processed entry of the auxtrace_buffer replaces the
+ * current auxtrace_heap top.
+ *
+ * 3. Auxtrace_queues might run of out data and are feeded by the
+ * PERF_RECORD_AUXTRACE handling, see s390_cpumsf_process_auxtrace_event().
+ *
+ * Event Generation
+ * Each sampling-data entry in the auxilary trace data generates a perf sample.
+ * This sample is filled
+ * with data from the auxtrace such as PID/TID, instruction address, CPU state,
+ * etc. This sample is processed with perf_session__deliver_synth_event() to
+ * be included into the GUI.
+ *
+ * 4. PERF_RECORD_FINISHED_ROUND event is used to process all the remaining
+ * auxiliary traces entries until the time stamp of this record is reached
+ * auxtrace_heap top. This is triggered by ordered_event->deliver().
+ *
+ *
+ * Perf event processing.
+ * Event processing of PERF_RECORD_XXX entries relies on time stamp entries.
+ * This is the function call sequence:
+ *
+ * __cmd_report()
+ * |
+ * perf_session__process_events()
+ * |
+ * __perf_session__process_events()
+ * |
+ * perf_session__process_event()
+ * | This functions splits the PERF_RECORD_XXX records.
+ * | - Those generated by perf record command (type number equal or higher
+ * | than PERF_RECORD_USER_TYPE_START) are handled by
+ * | perf_session__process_user_event(see below)
+ * | - Those generated by the kernel are handled by
+ * | perf_evlist__parse_sample_timestamp()
+ * |
+ * perf_evlist__parse_sample_timestamp()
+ * | Extract time stamp from sample data.
+ * |
+ * perf_session__queue_event()
+ * | If timestamp is positive the sample is entered into an ordered_event
+ * | list, sort order is the timestamp. The event processing is deferred until
+ * | later (see perf_session__process_user_event()).
+ * | Other timestamps (0 or -1) are handled immediately by
+ * | perf_session__deliver_event(). These are events generated at start up
+ * | of command perf record. They create PERF_RECORD_COMM and PERF_RECORD_MMAP*
+ * | records. They are needed to create a list of running processes and its
+ * | memory mappings and layout. They are needed at the beginning to enable
+ * | command perf report to create process trees and memory mappings.
+ * |
+ * perf_session__deliver_event()
+ * | Delivers a PERF_RECORD_XXX entry for handling.
+ * |
+ * auxtrace__process_event()
+ * | The timestamp of the PERF_RECORD_XXX entry is taken to correlate with
+ * | time stamps from the auxiliary trace buffers. This enables
+ * | synchronization between auxiliary trace data and the events on the
+ * | perf.data file.
+ * |
+ * machine__deliver_event()
+ * | Handles the PERF_RECORD_XXX event. This depends on the record type.
+ * It might update the process tree, update a process memory map or enter
+ * a sample with IP and call back chain data into GUI data pool.
+ *
+ *
+ * Deferred processing determined by perf_session__process_user_event() is
+ * finally processed when a PERF_RECORD_FINISHED_ROUND is encountered. These
+ * are generated during command perf record.
+ * The timestamp of PERF_RECORD_FINISHED_ROUND event is taken to process all
+ * PERF_RECORD_XXX entries stored in the ordered_event list. This list was
+ * built up while reading the perf.data file.
+ * Each event is now processed by calling perf_session__deliver_event().
+ * This enables time synchronization between the data in the perf.data file and
+ * the data in the auxiliary trace buffers.
*/

#include <endian.h>
@@ -37,6 +169,14 @@ struct s390_cpumsf {
u32 auxtrace_type;
u32 pmu_type;
u16 machine_type;
+ bool data_queued;
+};
+
+struct s390_cpumsf_queue {
+ struct s390_cpumsf *sf;
+ unsigned int queue_nr;
+ struct auxtrace_buffer *buffer;
+ int cpu;
};

/* Display s390 CPU measurement facility basic-sampling data entry */
@@ -181,8 +321,8 @@ static void s390_cpumsf_dump(struct s390_cpumsf *sf,
const char *color = PERF_COLOR_BLUE;
struct hws_basic_entry *basic;
struct hws_diag_entry *diag;
- size_t pos = 0;
unsigned short bsdes, dsdes;
+ size_t pos = 0;

color_fprintf(stdout, color,
". ... s390 AUX data: size %zu bytes\n",
@@ -243,15 +383,414 @@ static void s390_cpumsf_dump_event(struct s390_cpumsf *sf, unsigned char *buf,
s390_cpumsf_dump(sf, buf, len);
}

+#define S390_LPP_PID_MASK 0xffffffff
+
+static bool s390_cpumsf_make_event(size_t pos,
+ struct hws_basic_entry *basic,
+ struct s390_cpumsf_queue *sfq)
+{
+ struct perf_sample sample = {
+ .ip = basic->ia,
+ .pid = basic->hpp & S390_LPP_PID_MASK,
+ .tid = basic->hpp & S390_LPP_PID_MASK,
+ .cpumode = PERF_RECORD_MISC_CPUMODE_UNKNOWN,
+ .cpu = sfq->cpu,
+ .period = 1
+ };
+ union perf_event event;
+
+ memset(&event, 0, sizeof(event));
+ if (basic->CL == 1) /* Native LPAR mode */
+ sample.cpumode = basic->P ? PERF_RECORD_MISC_USER
+ : PERF_RECORD_MISC_KERNEL;
+ else if (basic->CL == 2) /* Guest kernel/user space */
+ sample.cpumode = basic->P ? PERF_RECORD_MISC_GUEST_USER
+ : PERF_RECORD_MISC_GUEST_KERNEL;
+ else if (basic->gpp || basic->prim_asn != 0xffff)
+ /* Use heuristics on old hardware */
+ sample.cpumode = basic->P ? PERF_RECORD_MISC_GUEST_USER
+ : PERF_RECORD_MISC_GUEST_KERNEL;
+ else
+ sample.cpumode = basic->P ? PERF_RECORD_MISC_USER
+ : PERF_RECORD_MISC_KERNEL;
+
+ event.sample.header.type = PERF_RECORD_SAMPLE;
+ event.sample.header.misc = sample.cpumode;
+ event.sample.header.size = sizeof(struct perf_event_header);
+
+ pr_debug4("%s pos:%#zx ip:%#" PRIx64 " P:%d CL:%d pid:%d.%d cpumode:%d cpu:%d\n",
+ __func__, pos, sample.ip, basic->P, basic->CL, sample.pid,
+ sample.tid, sample.cpumode, sample.cpu);
+ if (perf_session__deliver_synth_event(sfq->sf->session, &event,
+ &sample)) {
+ pr_err("s390 Auxiliary Trace: failed to deliver event\n");
+ return false;
+ }
+ return true;
+}
+
+static unsigned long long get_trailer_time(const unsigned char *buf)
+{
+ struct hws_trailer_entry *te;
+ unsigned long long aux_time;
+
+ te = (struct hws_trailer_entry *)(buf + S390_CPUMSF_PAGESZ
+ - sizeof(*te));
+
+ if (!te->clock_base) /* TOD_CLOCK_BASE value missing */
+ return 0;
+
+ /* Correct calculation to convert time stamp in trailer entry to
+ * nano seconds (taken from arch/s390 function tod_to_ns()).
+ * TOD_CLOCK_BASE is stored in trailer entry member progusage2.
+ */
+ aux_time = trailer_timestamp(te) - te->progusage2;
+ aux_time = (aux_time >> 9) * 125 + (((aux_time & 0x1ff) * 125) >> 9);
+ return aux_time;
+}
+
+/* Process the data samples of a single queue. The first parameter is a
+ * pointer to the queue, the second parameter is the time stamp. This
+ * is the time stamp:
+ * - of the event that triggered this processing.
+ * - or the time stamp when the last proccesing of this queue stopped.
+ * In this case it stopped at a 4KB page boundary and record the
+ * position on where to continue processing on the next invocation
+ * (see buffer->use_data and buffer->use_size).
+ *
+ * When this function returns the second parameter is updated to
+ * reflect the time stamp of the last processed auxiliary data entry
+ * (taken from the trailer entry of that page). The caller uses this
+ * returned time stamp to record the last processed entry in this
+ * queue.
+ *
+ * The function returns:
+ * 0: Processing successful. The second parameter returns the
+ * time stamp from the trailer entry until which position
+ * processing took place. Subsequent calls resume from this
+ * position.
+ * <0: An error occurred during processing. The second parameter
+ * returns the maximum time stamp.
+ * >0: Done on this queue. The second parameter returns the
+ * maximum time stamp.
+ */
+static int s390_cpumsf_samples(struct s390_cpumsf_queue *sfq, u64 *ts)
+{
+ struct s390_cpumsf *sf = sfq->sf;
+ unsigned char *buf = sfq->buffer->use_data;
+ size_t len = sfq->buffer->use_size;
+ struct hws_basic_entry *basic;
+ unsigned short bsdes, dsdes;
+ size_t pos = 0;
+ int err = 1;
+ u64 aux_ts;
+
+ if (!s390_cpumsf_validate(sf->machine_type, buf, len, &bsdes,
+ &dsdes)) {
+ *ts = ~0ULL;
+ return -1;
+ }
+
+ /* Get trailer entry time stamp and check if entries in
+ * this auxiliary page are ready for processing. If the
+ * time stamp of the first entry is too high, whole buffer
+ * can be skipped. In this case return time stamp.
+ */
+ aux_ts = get_trailer_time(buf);
+ if (!aux_ts) {
+ pr_err("[%#08" PRIx64 "] Invalid AUX trailer entry TOD clock base\n",
+ sfq->buffer->data_offset);
+ aux_ts = ~0ULL;
+ goto out;
+ }
+ if (aux_ts > *ts) {
+ *ts = aux_ts;
+ return 0;
+ }
+
+ while (pos < len) {
+ /* Handle Basic entry */
+ basic = (struct hws_basic_entry *)(buf + pos);
+ if (s390_cpumsf_make_event(pos, basic, sfq))
+ pos += bsdes;
+ else {
+ err = -EBADF;
+ goto out;
+ }
+
+ pos += dsdes; /* Skip diagnositic entry */
+
+ /* Check for trailer entry */
+ if (!s390_cpumsf_reached_trailer(bsdes + dsdes, pos)) {
+ pos = (pos + S390_CPUMSF_PAGESZ)
+ & ~(S390_CPUMSF_PAGESZ - 1);
+ /* Check existence of next page */
+ if (pos >= len)
+ break;
+ aux_ts = get_trailer_time(buf + pos);
+ if (!aux_ts) {
+ aux_ts = ~0ULL;
+ goto out;
+ }
+ if (aux_ts > *ts) {
+ *ts = aux_ts;
+ sfq->buffer->use_data += pos;
+ sfq->buffer->use_size -= pos;
+ return 0;
+ }
+ }
+ }
+out:
+ *ts = aux_ts;
+ sfq->buffer->use_size = 0;
+ sfq->buffer->use_data = NULL;
+ return err; /* Buffer completely scanned or error */
+}
+
+/* Run the s390 auxiliary trace decoder.
+ * Select the queue buffer to operate on, the caller already selected
+ * the proper queue, depending on second parameter 'ts'.
+ * This is the time stamp until which the auxiliary entries should
+ * be processed. This value is updated by called functions and
+ * returned to the caller.
+ *
+ * Resume processing in the current buffer. If there is no buffer
+ * get a new buffer from the queue and setup start position for
+ * processing.
+ * When a buffer is completely processed remove it from the queue
+ * before returning.
+ *
+ * This function returns
+ * 1: When the queue is empty. Second parameter will be set to
+ * maximum time stamp.
+ * 0: Normal processing done.
+ * <0: Error during queue buffer setup. This causes the caller
+ * to stop processing completely.
+ */
+static int s390_cpumsf_run_decoder(struct s390_cpumsf_queue *sfq,
+ u64 *ts)
+{
+
+ struct auxtrace_buffer *buffer;
+ struct auxtrace_queue *queue;
+ int err;
+
+ queue = &sfq->sf->queues.queue_array[sfq->queue_nr];
+
+ /* Get buffer and last position in buffer to resume
+ * decoding the auxiliary entries. One buffer might be large
+ * and decoding might stop in between. This depends on the time
+ * stamp of the trailer entry in each page of the auxiliary
+ * data and the time stamp of the event triggering the decoding.
+ */
+ if (sfq->buffer == NULL) {
+ sfq->buffer = buffer = auxtrace_buffer__next(queue,
+ sfq->buffer);
+ if (!buffer) {
+ *ts = ~0ULL;
+ return 1; /* Processing done on this queue */
+ }
+ /* Start with a new buffer on this queue */
+ if (buffer->data) {
+ buffer->use_size = buffer->size;
+ buffer->use_data = buffer->data;
+ }
+ } else
+ buffer = sfq->buffer;
+
+ if (!buffer->data) {
+ int fd = perf_data__fd(sfq->sf->session->data);
+
+ buffer->data = auxtrace_buffer__get_data(buffer, fd);
+ if (!buffer->data)
+ return -ENOMEM;
+ buffer->use_size = buffer->size;
+ buffer->use_data = buffer->data;
+ }
+ pr_debug4("%s queue_nr:%d buffer:%" PRId64 " offset:%#" PRIx64 " size:%#zx rest:%#zx\n",
+ __func__, sfq->queue_nr, buffer->buffer_nr, buffer->offset,
+ buffer->size, buffer->use_size);
+ err = s390_cpumsf_samples(sfq, ts);
+
+ /* If non-zero, there is either an error (err < 0) or the buffer is
+ * completely done (err > 0). The error is unrecoverable, usually
+ * some descriptors could not be read successfully, so continue with
+ * the next buffer.
+ * In both cases the parameter 'ts' has been updated.
+ */
+ if (err) {
+ sfq->buffer = NULL;
+ list_del(&buffer->list);
+ auxtrace_buffer__free(buffer);
+ if (err > 0) /* Buffer done, no error */
+ err = 0;
+ }
+ return err;
+}
+
+static struct s390_cpumsf_queue *
+s390_cpumsf_alloc_queue(struct s390_cpumsf *sf, unsigned int queue_nr)
+{
+ struct s390_cpumsf_queue *sfq;
+
+ sfq = zalloc(sizeof(struct s390_cpumsf_queue));
+ if (sfq == NULL)
+ return NULL;
+
+ sfq->sf = sf;
+ sfq->queue_nr = queue_nr;
+ sfq->cpu = -1;
+ return sfq;
+}
+
+static int s390_cpumsf_setup_queue(struct s390_cpumsf *sf,
+ struct auxtrace_queue *queue,
+ unsigned int queue_nr, u64 ts)
+{
+ struct s390_cpumsf_queue *sfq = queue->priv;
+
+ if (list_empty(&queue->head))
+ return 0;
+
+ if (sfq == NULL) {
+ sfq = s390_cpumsf_alloc_queue(sf, queue_nr);
+ if (!sfq)
+ return -ENOMEM;
+ queue->priv = sfq;
+
+ if (queue->cpu != -1)
+ sfq->cpu = queue->cpu;
+ }
+ return auxtrace_heap__add(&sf->heap, queue_nr, ts);
+}
+
+static int s390_cpumsf_setup_queues(struct s390_cpumsf *sf, u64 ts)
+{
+ unsigned int i;
+ int ret = 0;
+
+ for (i = 0; i < sf->queues.nr_queues; i++) {
+ ret = s390_cpumsf_setup_queue(sf, &sf->queues.queue_array[i],
+ i, ts);
+ if (ret)
+ break;
+ }
+ return ret;
+}
+
+static int s390_cpumsf_update_queues(struct s390_cpumsf *sf, u64 ts)
+{
+ if (!sf->queues.new_data)
+ return 0;
+
+ sf->queues.new_data = false;
+ return s390_cpumsf_setup_queues(sf, ts);
+}
+
+static int s390_cpumsf_process_queues(struct s390_cpumsf *sf, u64 timestamp)
+{
+ unsigned int queue_nr;
+ u64 ts;
+ int ret;
+
+ while (1) {
+ struct auxtrace_queue *queue;
+ struct s390_cpumsf_queue *sfq;
+
+ if (!sf->heap.heap_cnt)
+ return 0;
+
+ if (sf->heap.heap_array[0].ordinal >= timestamp)
+ return 0;
+
+ queue_nr = sf->heap.heap_array[0].queue_nr;
+ queue = &sf->queues.queue_array[queue_nr];
+ sfq = queue->priv;
+
+ auxtrace_heap__pop(&sf->heap);
+ if (sf->heap.heap_cnt) {
+ ts = sf->heap.heap_array[0].ordinal + 1;
+ if (ts > timestamp)
+ ts = timestamp;
+ } else {
+ ts = timestamp;
+ }
+
+ ret = s390_cpumsf_run_decoder(sfq, &ts);
+ if (ret < 0) {
+ auxtrace_heap__add(&sf->heap, queue_nr, ts);
+ return ret;
+ }
+ if (!ret) {
+ ret = auxtrace_heap__add(&sf->heap, queue_nr, ts);
+ if (ret < 0)
+ return ret;
+ }
+ }
+ return 0;
+}
+
+static int s390_cpumsf_synth_error(struct s390_cpumsf *sf, int code, int cpu,
+ pid_t pid, pid_t tid, u64 ip)
+{
+ char msg[MAX_AUXTRACE_ERROR_MSG];
+ union perf_event event;
+ int err;
+
+ strncpy(msg, "Lost Auxiliary Trace Buffer", sizeof(msg) - 1);
+ auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
+ code, cpu, pid, tid, ip, msg);
+
+ err = perf_session__deliver_synth_event(sf->session, &event, NULL);
+ if (err)
+ pr_err("s390 Auxiliary Trace: failed to deliver error event,"
+ "error %d\n", err);
+ return err;
+}
+
+static int s390_cpumsf_lost(struct s390_cpumsf *sf, struct perf_sample *sample)
+{
+ return s390_cpumsf_synth_error(sf, 1, sample->cpu,
+ sample->pid, sample->tid, 0);
+}
+
static int
s390_cpumsf_process_event(struct perf_session *session __maybe_unused,
- union perf_event *event __maybe_unused,
- struct perf_sample *sample __maybe_unused,
- struct perf_tool *tool __maybe_unused)
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct perf_tool *tool)
{
- return 0;
+ struct s390_cpumsf *sf = container_of(session->auxtrace,
+ struct s390_cpumsf,
+ auxtrace);
+ u64 timestamp = sample->time;
+ int err = 0;
+
+ if (dump_trace)
+ return 0;
+
+ if (!tool->ordered_events) {
+ pr_err("s390 Auxiliary Trace requires ordered events\n");
+ return -EINVAL;
+ }
+
+ if (event->header.type == PERF_RECORD_AUX &&
+ event->aux.flags & PERF_AUX_FLAG_TRUNCATED)
+ return s390_cpumsf_lost(sf, sample);
+
+ if (timestamp) {
+ err = s390_cpumsf_update_queues(sf, timestamp);
+ if (!err)
+ err = s390_cpumsf_process_queues(sf, timestamp);
+ }
+ return err;
}

+struct s390_cpumsf_synth {
+ struct perf_tool cpumsf_tool;
+ struct perf_session *session;
+};
+
static int
s390_cpumsf_process_auxtrace_event(struct perf_session *session,
union perf_event *event __maybe_unused,
@@ -266,6 +805,9 @@ s390_cpumsf_process_auxtrace_event(struct perf_session *session,
off_t data_offset;
int err;

+ if (sf->data_queued)
+ return 0;
+
if (perf_data__is_pipe(session->data)) {
data_offset = 0;
} else {
@@ -290,17 +832,21 @@ s390_cpumsf_process_auxtrace_event(struct perf_session *session,
return 0;
}

+static void s390_cpumsf_free_events(struct perf_session *session __maybe_unused)
+{
+}
+
static int s390_cpumsf_flush(struct perf_session *session __maybe_unused,
struct perf_tool *tool __maybe_unused)
{
return 0;
}

-static void s390_cpumsf_free_events(struct perf_session *session)
+static void s390_cpumsf_free_queues(struct perf_session *session)
{
struct s390_cpumsf *sf = container_of(session->auxtrace,
struct s390_cpumsf,
- auxtrace);
+ auxtrace);
struct auxtrace_queues *queues = &sf->queues;
unsigned int i;

@@ -316,7 +862,7 @@ static void s390_cpumsf_free(struct perf_session *session)
auxtrace);

auxtrace_heap__free(&sf->heap);
- s390_cpumsf_free_events(session);
+ s390_cpumsf_free_queues(session);
session->auxtrace = NULL;
free(sf);
}
@@ -329,6 +875,19 @@ static int s390_cpumsf_get_type(const char *cpuid)
return (ret == 1) ? family : 0;
}

+/* Check itrace options set on perf report command.
+ * Return true, if none are set or all options specified can be
+ * handled on s390.
+ * Return false otherwise.
+ */
+static bool check_auxtrace_itrace(struct itrace_synth_opts *itops)
+{
+ if (!itops || !itops->set)
+ return true;
+ pr_err("No --itrace options supported\n");
+ return false;
+}
+
int s390_cpumsf_process_auxtrace_info(union perf_event *event,
struct perf_session *session)
{
@@ -343,6 +902,11 @@ int s390_cpumsf_process_auxtrace_info(union perf_event *event,
if (sf == NULL)
return -ENOMEM;

+ if (!check_auxtrace_itrace(session->itrace_synth_opts)) {
+ err = -EINVAL;
+ goto err_free;
+ }
+
err = auxtrace_queues__init(&sf->queues);
if (err)
goto err_free;
@@ -360,8 +924,21 @@ int s390_cpumsf_process_auxtrace_info(union perf_event *event,
sf->auxtrace.free = s390_cpumsf_free;
session->auxtrace = &sf->auxtrace;

+ if (dump_trace)
+ return 0;
+
+ err = auxtrace_queues__process_index(&sf->queues, session);
+ if (err)
+ goto err_free_queues;
+
+ if (sf->queues.populated)
+ sf->data_queued = true;
+
return 0;

+err_free_queues:
+ auxtrace_queues__free(&sf->queues);
+ session->auxtrace = NULL;
err_free:
free(sf);
return err;
--
2.14.4
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