header.c

 1// SPDX-License-Identifier: GPL-2.0
 2#include <sys/types.h>
 3#include <errno.h>
 4#include <unistd.h>
 5#include <stdio.h>
 6#include <stdlib.h>
 7#include <string.h>
 8#include <linux/stringify.h>
 9#include "header.h"
10#include "utils_header.h"
11#include "metricgroup.h"
12#include <api/fs/fs.h>
13#include <sys/auxv.h>
14
15static bool is_compat_mode(void)
16{
17	unsigned long base_platform = getauxval(AT_BASE_PLATFORM);
18	unsigned long platform = getauxval(AT_PLATFORM);
19
20	if (!strcmp((char *)platform, (char *)base_platform))
21		return false;
22
23	return true;
24}
25
26int
27get_cpuid(char *buffer, size_t sz, struct perf_cpu cpu __maybe_unused)
28{
29	unsigned long pvr;
30	int nb;
31
32	pvr = mfspr(SPRN_PVR);
33
34	nb = scnprintf(buffer, sz, "%lu,%lu$", PVR_VER(pvr), PVR_REV(pvr));
35
36	/* look for end marker to ensure the entire data fit */
37	if (strchr(buffer, '$')) {
38		buffer[nb-1] = '\0';
39		return 0;
40	}
41	return ENOBUFS;
42}
43
44char *
45get_cpuid_str(struct perf_cpu cpu __maybe_unused)
46{
47	char *bufp;
48	unsigned long pvr;
49
50	/*
51	 * IBM Power System supports compatible mode. That is
52	 * Nth generation platform can support previous generation
53	 * OS in a mode called compatibile mode. For ex. LPAR can be
54	 * booted in a Power9 mode when the system is a Power10.
55	 *
56	 * In the compatible mode, care must be taken when generating
57	 * PVR value. When read, PVR will be of the AT_BASE_PLATFORM
58	 * To support generic events, return 0x00ffffff as pvr when
59	 * booted in compat mode. Based on this pvr value, json will
60	 * pick events from pmu-events/arch/powerpc/compat
61	 */
62	if (!is_compat_mode())
63		pvr = mfspr(SPRN_PVR);
64	else
65		pvr = 0x00ffffff;
66
67	if (asprintf(&bufp, "0x%.8lx", pvr) < 0)
68		bufp = NULL;
69
70	return bufp;
71}
72
73int arch_get_runtimeparam(const struct pmu_metric *pm)
74{
75	int count;
76	char path[PATH_MAX] = "/devices/hv_24x7/interface/";
77
78	strcat(path, pm->aggr_mode == PerChip ? "sockets" : "coresperchip");
79	return sysfs__read_int(path, &count) < 0 ? 1 : count;
80}