cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cpu_mcf.h (3064B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Counter facility support definitions for the Linux perf
      4 *
      5 * Copyright IBM Corp. 2019
      6 * Author(s): Hendrik Brueckner <brueckner@linux.ibm.com>
      7 */
      8#ifndef _ASM_S390_CPU_MCF_H
      9#define _ASM_S390_CPU_MCF_H
     10
     11#include <linux/perf_event.h>
     12#include <asm/cpu_mf.h>
     13
     14enum cpumf_ctr_set {
     15	CPUMF_CTR_SET_BASIC   = 0,    /* Basic Counter Set */
     16	CPUMF_CTR_SET_USER    = 1,    /* Problem-State Counter Set */
     17	CPUMF_CTR_SET_CRYPTO  = 2,    /* Crypto-Activity Counter Set */
     18	CPUMF_CTR_SET_EXT     = 3,    /* Extended Counter Set */
     19	CPUMF_CTR_SET_MT_DIAG = 4,    /* MT-diagnostic Counter Set */
     20
     21	/* Maximum number of counter sets */
     22	CPUMF_CTR_SET_MAX,
     23};
     24
     25#define CPUMF_LCCTL_ENABLE_SHIFT    16
     26#define CPUMF_LCCTL_ACTCTL_SHIFT     0
     27
     28static inline void ctr_set_enable(u64 *state, u64 ctrsets)
     29{
     30	*state |= ctrsets << CPUMF_LCCTL_ENABLE_SHIFT;
     31}
     32
     33static inline void ctr_set_disable(u64 *state, u64 ctrsets)
     34{
     35	*state &= ~(ctrsets << CPUMF_LCCTL_ENABLE_SHIFT);
     36}
     37
     38static inline void ctr_set_start(u64 *state, u64 ctrsets)
     39{
     40	*state |= ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT;
     41}
     42
     43static inline void ctr_set_stop(u64 *state, u64 ctrsets)
     44{
     45	*state &= ~(ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT);
     46}
     47
     48static inline int ctr_stcctm(enum cpumf_ctr_set set, u64 range, u64 *dest)
     49{
     50	switch (set) {
     51	case CPUMF_CTR_SET_BASIC:
     52		return stcctm(BASIC, range, dest);
     53	case CPUMF_CTR_SET_USER:
     54		return stcctm(PROBLEM_STATE, range, dest);
     55	case CPUMF_CTR_SET_CRYPTO:
     56		return stcctm(CRYPTO_ACTIVITY, range, dest);
     57	case CPUMF_CTR_SET_EXT:
     58		return stcctm(EXTENDED, range, dest);
     59	case CPUMF_CTR_SET_MT_DIAG:
     60		return stcctm(MT_DIAG_CLEARING, range, dest);
     61	case CPUMF_CTR_SET_MAX:
     62		return 3;
     63	}
     64	return 3;
     65}
     66
     67struct cpu_cf_events {
     68	struct cpumf_ctr_info	info;
     69	atomic_t		ctr_set[CPUMF_CTR_SET_MAX];
     70	atomic64_t		alert;
     71	u64			state;		/* For perf_event_open SVC */
     72	u64			dev_state;	/* For /dev/hwctr */
     73	unsigned int		flags;
     74	size_t used;			/* Bytes used in data */
     75	size_t usedss;			/* Bytes used in start/stop */
     76	unsigned char start[PAGE_SIZE];	/* Counter set at event add */
     77	unsigned char stop[PAGE_SIZE];	/* Counter set at event delete */
     78	unsigned char data[PAGE_SIZE];	/* Counter set at /dev/hwctr */
     79	unsigned int sets;		/* # Counter set saved in memory */
     80};
     81DECLARE_PER_CPU(struct cpu_cf_events, cpu_cf_events);
     82
     83bool kernel_cpumcf_avail(void);
     84int __kernel_cpumcf_begin(void);
     85unsigned long kernel_cpumcf_alert(int clear);
     86void __kernel_cpumcf_end(void);
     87
     88static inline int kernel_cpumcf_begin(void)
     89{
     90	if (!cpum_cf_avail())
     91		return -ENODEV;
     92
     93	preempt_disable();
     94	return __kernel_cpumcf_begin();
     95}
     96static inline void kernel_cpumcf_end(void)
     97{
     98	__kernel_cpumcf_end();
     99	preempt_enable();
    100}
    101
    102/* Return true if store counter set multiple instruction is available */
    103static inline int stccm_avail(void)
    104{
    105	return test_facility(142);
    106}
    107
    108size_t cpum_cf_ctrset_size(enum cpumf_ctr_set ctrset,
    109			   struct cpumf_ctr_info *info);
    110int cfset_online_cpu(unsigned int cpu);
    111int cfset_offline_cpu(unsigned int cpu);
    112#endif /* _ASM_S390_CPU_MCF_H */