Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <linux/bits.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include "probe.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) static umode_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) not_visible(struct kobject *kobj, struct attribute *attr, int i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * Accepts msr[] array with non populated entries as long as either
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * msr[i].msr is 0 or msr[i].grp is NULL. Note that the default sysfs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * visibility is visible when group->is_visible callback is set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) perf_msr_probe(struct perf_msr *msr, int cnt, bool zero, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	unsigned long avail = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	unsigned int bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	u64 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	if (cnt >= BITS_PER_LONG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	for (bit = 0; bit < cnt; bit++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		if (!msr[bit].no_check) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 			struct attribute_group *grp = msr[bit].grp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 			/* skip entry with no group */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 			if (!grp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 			grp->is_visible = not_visible;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 			/* skip unpopulated entry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 			if (!msr[bit].msr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 			if (msr[bit].test && !msr[bit].test(bit, data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 			/* Virt sucks; you cannot tell if a R/O MSR is present :/ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 			if (rdmsrl_safe(msr[bit].msr, &val))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 			/* Disable zero counters if requested. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 			if (!zero && !val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 			grp->is_visible = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		avail |= BIT(bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	return avail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) EXPORT_SYMBOL_GPL(perf_msr_probe);