From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- arch/x86/events/probe.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 arch/x86/events/probe.c (limited to 'arch/x86/events/probe.c') diff --git a/arch/x86/events/probe.c b/arch/x86/events/probe.c new file mode 100644 index 000000000..136a1e847 --- /dev/null +++ b/arch/x86/events/probe.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include "probe.h" + +static umode_t +not_visible(struct kobject *kobj, struct attribute *attr, int i) +{ + return 0; +} + +/* + * Accepts msr[] array with non populated entries as long as either + * msr[i].msr is 0 or msr[i].grp is NULL. Note that the default sysfs + * visibility is visible when group->is_visible callback is set. + */ +unsigned long +perf_msr_probe(struct perf_msr *msr, int cnt, bool zero, void *data) +{ + unsigned long avail = 0; + unsigned int bit; + u64 val; + + if (cnt >= BITS_PER_LONG) + return 0; + + for (bit = 0; bit < cnt; bit++) { + if (!msr[bit].no_check) { + struct attribute_group *grp = msr[bit].grp; + + /* skip entry with no group */ + if (!grp) + continue; + + grp->is_visible = not_visible; + + /* skip unpopulated entry */ + if (!msr[bit].msr) + continue; + + if (msr[bit].test && !msr[bit].test(bit, data)) + continue; + /* Virt sucks; you cannot tell if a R/O MSR is present :/ */ + if (rdmsrl_safe(msr[bit].msr, &val)) + continue; + /* Disable zero counters if requested. */ + if (!zero && !val) + continue; + + grp->is_visible = NULL; + } + avail |= BIT(bit); + } + + return avail; +} +EXPORT_SYMBOL_GPL(perf_msr_probe); -- cgit v1.2.3