1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/export.h>
3 #include <linux/types.h>
4 #include <linux/bits.h>
8 not_visible(struct kobject *kobj, struct attribute *attr, int i)
14 * Accepts msr[] array with non populated entries as long as either
15 * msr[i].msr is 0 or msr[i].grp is NULL. Note that the default sysfs
16 * visibility is visible when group->is_visible callback is set.
19 perf_msr_probe(struct perf_msr *msr, int cnt, bool zero, void *data)
21 unsigned long avail = 0;
25 if (cnt >= BITS_PER_LONG)
28 for (bit = 0; bit < cnt; bit++) {
29 if (!msr[bit].no_check) {
30 struct attribute_group *grp = msr[bit].grp;
33 /* skip entry with no group */
37 grp->is_visible = not_visible;
39 /* skip unpopulated entry */
43 if (msr[bit].test && !msr[bit].test(bit, data))
45 /* Virt sucks; you cannot tell if a R/O MSR is present :/ */
46 if (rdmsrl_safe(msr[bit].msr, &val))
52 /* Disable zero counters if requested. */
53 if (!zero && !(val & mask))
56 grp->is_visible = NULL;
63 EXPORT_SYMBOL_GPL(perf_msr_probe);