diff options
| -rw-r--r-- | tools/perf/arch/arm/util/cs-etm.c | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c index d942f118d32c..85168d87b2d7 100644 --- a/tools/perf/arch/arm/util/cs-etm.c +++ b/tools/perf/arch/arm/util/cs-etm.c @@ -38,8 +38,6 @@ struct cs_etm_recording { struct auxtrace_record itr; struct perf_pmu *cs_etm_pmu; struct evlist *evlist; - int wrapped_cnt; - bool *wrapped; bool snapshot_mode; size_t snapshot_size; }; @@ -734,135 +732,6 @@ static int cs_etm_info_fill(struct auxtrace_record *itr, return 0; } -static int cs_etm_alloc_wrapped_array(struct cs_etm_recording *ptr, int idx) -{ - bool *wrapped; - int cnt = ptr->wrapped_cnt; - - /* Make @ptr->wrapped as big as @idx */ - while (cnt <= idx) - cnt++; - - /* - * Free'ed in cs_etm_recording_free(). Using realloc() to avoid - * cross compilation problems where the host's system supports - * reallocarray() but not the target. - */ - wrapped = realloc(ptr->wrapped, cnt * sizeof(bool)); - if (!wrapped) - return -ENOMEM; - - wrapped[cnt - 1] = false; - ptr->wrapped_cnt = cnt; - ptr->wrapped = wrapped; - - return 0; -} - -static bool cs_etm_buffer_has_wrapped(unsigned char *buffer, - size_t buffer_size, u64 head) -{ - u64 i, watermark; - u64 *buf = (u64 *)buffer; - size_t buf_size = buffer_size; - - /* - * We want to look the very last 512 byte (chosen arbitrarily) in - * the ring buffer. - */ - watermark = buf_size - 512; - - /* - * @head is continuously increasing - if its value is equal or greater - * than the size of the ring buffer, it has wrapped around. - */ - if (head >= buffer_size) - return true; - - /* - * The value of @head is somewhere within the size of the ring buffer. - * This can be that there hasn't been enough data to fill the ring - * buffer yet or the trace time was so long that @head has numerically - * wrapped around. To find we need to check if we have data at the very - * end of the ring buffer. We can reliably do this because mmap'ed - * pages are zeroed out and there is a fresh mapping with every new - * session. - */ - - /* @head is less than 512 byte from the end of the ring buffer */ - if (head > watermark) - watermark = head; - - /* - * Speed things up by using 64 bit transactions (see "u64 *buf" above) - */ - watermark >>= 3; - buf_size >>= 3; - - /* - * If we find trace data at the end of the ring buffer, @head has - * been there and has numerically wrapped around at least once. - */ - for (i = watermark; i < buf_size; i++) - if (buf[i]) - return true; - - return false; -} - -static int cs_etm_find_snapshot(struct auxtrace_record *itr, - int idx, struct auxtrace_mmap *mm, - unsigned char *data, - u64 *head, u64 *old) -{ - int err; - bool wrapped; - struct cs_etm_recording *ptr = - container_of(itr, struct cs_etm_recording, itr); - - /* - * Allocate memory to keep track of wrapping if this is the first - * time we deal with this *mm. - */ - if (idx >= ptr->wrapped_cnt) { - err = cs_etm_alloc_wrapped_array(ptr, idx); - if (err) - return err; - } - - /* - * Check to see if *head has wrapped around. If it hasn't only the - * amount of data between *head and *old is snapshot'ed to avoid - * bloating the perf.data file with zeros. But as soon as *head has - * wrapped around the entire size of the AUX ring buffer it taken. - */ - wrapped = ptr->wrapped[idx]; - if (!wrapped && cs_etm_buffer_has_wrapped(data, mm->len, *head)) { - wrapped = true; - ptr->wrapped[idx] = true; - } - - pr_debug3("%s: mmap index %d old head %zu new head %zu size %zu\n", - __func__, idx, (size_t)*old, (size_t)*head, mm->len); - - /* No wrap has occurred, we can just use *head and *old. */ - if (!wrapped) - return 0; - - /* - * *head has wrapped around - adjust *head and *old to pickup the - * entire content of the AUX buffer. - */ - if (*head >= mm->len) { - *old = *head - mm->len; - } else { - *head += mm->len; - *old = *head - mm->len; - } - - return 0; -} - static int cs_etm_snapshot_start(struct auxtrace_record *itr) { struct cs_etm_recording *ptr = @@ -900,7 +769,6 @@ static void cs_etm_recording_free(struct auxtrace_record *itr) struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); - zfree(&ptr->wrapped); free(ptr); } @@ -928,7 +796,6 @@ struct auxtrace_record *cs_etm_record_init(int *err) ptr->itr.recording_options = cs_etm_recording_options; ptr->itr.info_priv_size = cs_etm_info_priv_size; ptr->itr.info_fill = cs_etm_info_fill; - ptr->itr.find_snapshot = cs_etm_find_snapshot; ptr->itr.snapshot_start = cs_etm_snapshot_start; ptr->itr.snapshot_finish = cs_etm_snapshot_finish; ptr->itr.reference = cs_etm_reference; |