auxtrace.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * VPA support
  4 */
  5#include <errno.h>
  6#include <linux/kernel.h>
  7#include <linux/types.h>
  8#include <linux/string.h>
  9
 10#include "../../util/evlist.h"
 11#include "../../util/debug.h"
 12#include "../../util/auxtrace.h"
 13#include "../../util/powerpc-vpadtl.h"
 14#include "../../util/record.h"
 15#include <internal/lib.h> // page_size
 16
 17#define KiB(x) ((x) * 1024)
 18
 19static int
 20powerpc_vpadtl_recording_options(struct auxtrace_record *ar __maybe_unused,
 21			struct evlist *evlist __maybe_unused,
 22			struct record_opts *opts)
 23{
 24	opts->full_auxtrace = true;
 25
 26	/*
 27	 * Set auxtrace_mmap_pages to minimum
 28	 * two pages
 29	 */
 30	if (!opts->auxtrace_mmap_pages) {
 31		opts->auxtrace_mmap_pages = KiB(128) / page_size;
 32		if (opts->mmap_pages == UINT_MAX)
 33			opts->mmap_pages = KiB(256) / page_size;
 34	}
 35
 36	return 0;
 37}
 38
 39static size_t powerpc_vpadtl_info_priv_size(struct auxtrace_record *itr __maybe_unused,
 40					struct evlist *evlist __maybe_unused)
 41{
 42	return VPADTL_AUXTRACE_PRIV_SIZE;
 43}
 44
 45static int
 46powerpc_vpadtl_info_fill(struct auxtrace_record *itr __maybe_unused,
 47		struct perf_session *session __maybe_unused,
 48		struct perf_record_auxtrace_info *auxtrace_info,
 49		size_t priv_size __maybe_unused)
 50{
 51	auxtrace_info->type = PERF_AUXTRACE_VPA_DTL;
 52
 53	return 0;
 54}
 55
 56static void powerpc_vpadtl_free(struct auxtrace_record *itr)
 57{
 58	free(itr);
 59}
 60
 61static u64 powerpc_vpadtl_reference(struct auxtrace_record *itr __maybe_unused)
 62{
 63	return 0;
 64}
 65
 66struct auxtrace_record *auxtrace_record__init(struct evlist *evlist,
 67						int *err)
 68{
 69	struct auxtrace_record *aux;
 70	struct evsel *pos;
 71	int found = 0;
 72
 73	evlist__for_each_entry(evlist, pos) {
 74		if (strstarts(pos->name, "vpa_dtl")) {
 75			found = 1;
 76			pos->needs_auxtrace_mmap = true;
 77			break;
 78		}
 79	}
 80
 81	if (!found)
 82		return NULL;
 83
 84	/*
 85	 * To obtain the auxtrace buffer file descriptor, the auxtrace event
 86	 * must come first.
 87	 */
 88	evlist__to_front(pos->evlist, pos);
 89
 90	aux = zalloc(sizeof(*aux));
 91	if (aux == NULL) {
 92		pr_debug("aux record is NULL\n");
 93		*err = -ENOMEM;
 94		return NULL;
 95	}
 96
 97	aux->recording_options = powerpc_vpadtl_recording_options;
 98	aux->info_priv_size = powerpc_vpadtl_info_priv_size;
 99	aux->info_fill = powerpc_vpadtl_info_fill;
100	aux->free = powerpc_vpadtl_free;
101	aux->reference = powerpc_vpadtl_reference;
102	return aux;
103}