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selftests/powerpc: Account for offline cpus in perf-hwbreak test

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For systemwide tests, use online cpu mask to only open events on online
cpus. This enables this test to work on systems in lower SMT modes.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/15fd447dcefd19945a7d31f0a475349f548a3603.1669096083.git.naveen.n.rao@linux.vnet.ibm.com
This commit is contained in:
Naveen N. Rao 2022-11-22 12:10:54 +05:30 committed by Michael Ellerman
parent 616ad3f4aa
commit 260095926d
1 changed files with 39 additions and 6 deletions
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45
tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
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@ -17,8 +17,11 @@
* Copyright (C) 2018 Michael Neuling, IBM Corporation.
*/
#define _GNU_SOURCE
#include <unistd.h>
#include <assert.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
@ -141,8 +144,10 @@ static void disable_fds(int *fd, int n)
static int perf_systemwide_event_open(int *fd, __u32 type, __u64 addr, __u64 len)
{
int i, ncpus, cpu, ret = 0;
struct rlimit rlim;
int i = 0;
cpu_set_t *mask;
size_t size;
if (getrlimit(RLIMIT_NOFILE, &rlim)) {
perror("getrlimit");
@ -154,16 +159,44 @@ static int perf_systemwide_event_open(int *fd, __u32 type, __u64 addr, __u64 len
return -1;
}
/* Assume online processors are 0 to nprocs for simplisity */
for (i = 0; i < nprocs; i++) {
fd[i] = perf_cpu_event_open(i, type, addr, len);
ncpus = get_nprocs_conf();
size = CPU_ALLOC_SIZE(ncpus);
mask = CPU_ALLOC(ncpus);
if (!mask) {
perror("malloc");
return -1;
}
CPU_ZERO_S(size, mask);
if (sched_getaffinity(0, size, mask)) {
perror("sched_getaffinity");
ret = -1;
goto done;
}
for (i = 0, cpu = 0; i < nprocs && cpu < ncpus; cpu++) {
if (!CPU_ISSET_S(cpu, size, mask))
continue;
fd[i] = perf_cpu_event_open(cpu, type, addr, len);
if (fd[i] < 0) {
perror("perf_systemwide_event_open");
close_fds(fd, i);
return fd[i];
ret = fd[i];
goto done;
}
i++;
}
return 0;
if (i < nprocs) {
printf("Error: Number of online cpus reduced since start of test: %d < %d\n", i, nprocs);
close_fds(fd, i);
ret = -1;
}
done:
CPU_FREE(mask);
return ret;
}
static inline bool breakpoint_test(int len)