fe5908bccc
Introduce a PMU device named cpum_cf_diag. It extracts the values of all counters in all authorized counter sets and stores them as event raw data. This is done with the STORE CPU COUNTER MULTIPLE instruction to speed up access. All counter sets fit into one buffer. The values of each counter are taken when the event is started on the performance sub-system and when the event is stopped. This results in counter values available at the start and at the end of the measurement time frame. The difference is calculated for each counter. The differences of all counters are then saved as event raw data in the perf.data file. The counter values are accompanied by the time stamps when the counter set was started and when the counter set was stopped. This data is part of a trailer entry which describes the time frame, counter set version numbers, CPU speed, and machine type for later analysis. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
127 lines
3.2 KiB
C
127 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Counter facility support definitions for the Linux perf
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*
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* Copyright IBM Corp. 2019
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* Author(s): Hendrik Brueckner <brueckner@linux.ibm.com>
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*/
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#ifndef _ASM_S390_CPU_MCF_H
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#define _ASM_S390_CPU_MCF_H
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#include <linux/perf_event.h>
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#include <asm/cpu_mf.h>
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enum cpumf_ctr_set {
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CPUMF_CTR_SET_BASIC = 0, /* Basic Counter Set */
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CPUMF_CTR_SET_USER = 1, /* Problem-State Counter Set */
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CPUMF_CTR_SET_CRYPTO = 2, /* Crypto-Activity Counter Set */
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CPUMF_CTR_SET_EXT = 3, /* Extended Counter Set */
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CPUMF_CTR_SET_MT_DIAG = 4, /* MT-diagnostic Counter Set */
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/* Maximum number of counter sets */
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CPUMF_CTR_SET_MAX,
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};
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#define CPUMF_LCCTL_ENABLE_SHIFT 16
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#define CPUMF_LCCTL_ACTCTL_SHIFT 0
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static const u64 cpumf_ctr_ctl[CPUMF_CTR_SET_MAX] = {
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[CPUMF_CTR_SET_BASIC] = 0x02,
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[CPUMF_CTR_SET_USER] = 0x04,
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[CPUMF_CTR_SET_CRYPTO] = 0x08,
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[CPUMF_CTR_SET_EXT] = 0x01,
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[CPUMF_CTR_SET_MT_DIAG] = 0x20,
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};
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static inline void ctr_set_enable(u64 *state, int ctr_set)
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{
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*state |= cpumf_ctr_ctl[ctr_set] << CPUMF_LCCTL_ENABLE_SHIFT;
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}
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static inline void ctr_set_disable(u64 *state, int ctr_set)
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{
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*state &= ~(cpumf_ctr_ctl[ctr_set] << CPUMF_LCCTL_ENABLE_SHIFT);
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}
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static inline void ctr_set_start(u64 *state, int ctr_set)
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{
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*state |= cpumf_ctr_ctl[ctr_set] << CPUMF_LCCTL_ACTCTL_SHIFT;
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}
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static inline void ctr_set_stop(u64 *state, int ctr_set)
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{
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*state &= ~(cpumf_ctr_ctl[ctr_set] << CPUMF_LCCTL_ACTCTL_SHIFT);
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}
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static inline void ctr_set_multiple_enable(u64 *state, u64 ctrsets)
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{
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*state |= ctrsets << CPUMF_LCCTL_ENABLE_SHIFT;
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}
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static inline void ctr_set_multiple_disable(u64 *state, u64 ctrsets)
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{
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*state &= ~(ctrsets << CPUMF_LCCTL_ENABLE_SHIFT);
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}
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static inline void ctr_set_multiple_start(u64 *state, u64 ctrsets)
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{
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*state |= ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT;
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}
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static inline void ctr_set_multiple_stop(u64 *state, u64 ctrsets)
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{
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*state &= ~(ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT);
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}
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static inline int ctr_stcctm(enum cpumf_ctr_set set, u64 range, u64 *dest)
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{
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switch (set) {
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case CPUMF_CTR_SET_BASIC:
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return stcctm(BASIC, range, dest);
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case CPUMF_CTR_SET_USER:
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return stcctm(PROBLEM_STATE, range, dest);
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case CPUMF_CTR_SET_CRYPTO:
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return stcctm(CRYPTO_ACTIVITY, range, dest);
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case CPUMF_CTR_SET_EXT:
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return stcctm(EXTENDED, range, dest);
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case CPUMF_CTR_SET_MT_DIAG:
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return stcctm(MT_DIAG_CLEARING, range, dest);
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case CPUMF_CTR_SET_MAX:
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return 3;
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}
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return 3;
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}
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struct cpu_cf_events {
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struct cpumf_ctr_info info;
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atomic_t ctr_set[CPUMF_CTR_SET_MAX];
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atomic64_t alert;
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u64 state, tx_state;
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unsigned int flags;
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unsigned int txn_flags;
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};
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DECLARE_PER_CPU(struct cpu_cf_events, cpu_cf_events);
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bool kernel_cpumcf_avail(void);
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int __kernel_cpumcf_begin(void);
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unsigned long kernel_cpumcf_alert(int clear);
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void __kernel_cpumcf_end(void);
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static inline int kernel_cpumcf_begin(void)
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{
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if (!cpum_cf_avail())
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return -ENODEV;
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preempt_disable();
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return __kernel_cpumcf_begin();
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}
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static inline void kernel_cpumcf_end(void)
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{
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__kernel_cpumcf_end();
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preempt_enable();
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}
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/* Return true if store counter set multiple instruction is available */
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static inline int stccm_avail(void)
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{
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return test_facility(142);
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}
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#endif /* _ASM_S390_CPU_MCF_H */
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