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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>
74 lines
2.8 KiB
C
74 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Performance event support - s390 specific definitions.
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*
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* Copyright IBM Corp. 2009, 2017
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
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*/
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#ifndef _ASM_S390_PERF_EVENT_H
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#define _ASM_S390_PERF_EVENT_H
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#include <linux/perf_event.h>
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#include <linux/device.h>
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/* Per-CPU flags for PMU states */
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#define PMU_F_RESERVED 0x1000
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#define PMU_F_ENABLED 0x2000
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#define PMU_F_IN_USE 0x4000
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#define PMU_F_ERR_IBE 0x0100
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#define PMU_F_ERR_LSDA 0x0200
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#define PMU_F_ERR_MASK (PMU_F_ERR_IBE|PMU_F_ERR_LSDA)
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/* Perf definitions for PMU event attributes in sysfs */
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extern __init const struct attribute_group **cpumf_cf_event_group(void);
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extern ssize_t cpumf_events_sysfs_show(struct device *dev,
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struct device_attribute *attr,
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char *page);
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#define EVENT_VAR(_cat, _name) event_attr_##_cat##_##_name
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#define EVENT_PTR(_cat, _name) (&EVENT_VAR(_cat, _name).attr.attr)
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#define CPUMF_EVENT_ATTR(cat, name, id) \
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PMU_EVENT_ATTR(name, EVENT_VAR(cat, name), id, cpumf_events_sysfs_show)
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#define CPUMF_EVENT_PTR(cat, name) EVENT_PTR(cat, name)
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/* Perf callbacks */
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struct pt_regs;
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extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
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extern unsigned long perf_misc_flags(struct pt_regs *regs);
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#define perf_misc_flags(regs) perf_misc_flags(regs)
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#define perf_arch_bpf_user_pt_regs(regs) ®s->user_regs
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/* Perf pt_regs extension for sample-data-entry indicators */
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struct perf_sf_sde_regs {
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unsigned char in_guest:1; /* guest sample */
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unsigned long reserved:63; /* reserved */
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};
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/* Perf PMU definitions for the counter facility */
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#define PERF_CPUM_CF_MAX_CTR 0xffffUL /* Max ctr for ECCTR */
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/* Perf PMU definitions for the sampling facility */
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#define PERF_CPUM_SF_MAX_CTR 2
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#define PERF_EVENT_CPUM_SF 0xB0000UL /* Event: Basic-sampling */
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#define PERF_EVENT_CPUM_SF_DIAG 0xBD000UL /* Event: Combined-sampling */
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#define PERF_EVENT_CPUM_CF_DIAG 0xBC000UL /* Event: Counter sets */
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#define PERF_CPUM_SF_BASIC_MODE 0x0001 /* Basic-sampling flag */
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#define PERF_CPUM_SF_DIAG_MODE 0x0002 /* Diagnostic-sampling flag */
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#define PERF_CPUM_SF_MODE_MASK (PERF_CPUM_SF_BASIC_MODE| \
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PERF_CPUM_SF_DIAG_MODE)
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#define PERF_CPUM_SF_FULL_BLOCKS 0x0004 /* Process full SDBs only */
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#define REG_NONE 0
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#define REG_OVERFLOW 1
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#define OVERFLOW_REG(hwc) ((hwc)->extra_reg.config)
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#define SFB_ALLOC_REG(hwc) ((hwc)->extra_reg.alloc)
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#define TEAR_REG(hwc) ((hwc)->last_tag)
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#define SAMPL_RATE(hwc) ((hwc)->event_base)
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#define SAMPL_FLAGS(hwc) ((hwc)->config_base)
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#define SAMPL_DIAG_MODE(hwc) (SAMPL_FLAGS(hwc) & PERF_CPUM_SF_DIAG_MODE)
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#define SDB_FULL_BLOCKS(hwc) (SAMPL_FLAGS(hwc) & PERF_CPUM_SF_FULL_BLOCKS)
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#endif /* _ASM_S390_PERF_EVENT_H */
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