/*
* Performance event support - PowerPC classic/server specific definitions.
*
* Copyright 2008-2009 Paul Mackerras, IBM Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/types.h>
#include <asm/hw_irq.h>
#include <linux/device.h>
#include <uapi/asm/perf_event.h>
#define MAX_HWEVENTS 8
#define MAX_EVENT_ALTERNATIVES 8
#define MAX_LIMITED_HWCOUNTERS 2
/*
* This struct provides the constants and functions needed to
* describe the PMU on a particular POWER-family CPU.
*/
struct power_pmu {
const char *name;
int n_counter;
int max_alternatives;
unsigned long add_fields;
unsigned long test_adder;
int (*compute_mmcr)(u64 events[], int n_ev,
unsigned int hwc[], unsigned long mmcr[]);
int (*get_constraint)(u64 event_id, unsigned long *mskp,
unsigned long *valp);
int (*get_alternatives)(u64 event_id, unsigned int flags,
u64 alt[]);
u64 (*bhrb_filter_map)(u64 branch_sample_type);
void (*config_bhrb)(u64 pmu_bhrb_filter);
void (*disable_pmc)(unsigned int pmc, unsigned long mmcr[]);
int (*limited_pmc_event)(u64 event_id);
u32 flags;
const struct attribute_group **attr_groups;
int n_generic;
int *generic_events;
int (*cache_events)[PERF_COUNT_HW_CACHE_MAX]
[PERF_COUNT_HW_CACHE_OP_MAX]
[PERF_COUNT_HW_CACHE_RESULT_MAX];
/* BHRB entries in the PMU */
int bhrb_nr;
};
/*
* Values for power_pmu.flags
*/
#define PPMU_LIMITED_PMC5_6 0x00000001 /* PMC5/6 have limited function */
#define PPMU_ALT_SIPR 0x00000002 /* uses alternate posn for SIPR/HV */
#define PPMU_NO_SIPR 0x00000004 /* no SIPR/HV in MMCRA at all */
#define PPMU_NO_CONT_SAMPLING 0x00000008 /* no continuous sampling */
#define PPMU_SIAR_VALID 0x00000010 /* Processor has SIAR Valid bit */
#define PPMU_HAS_SSLOT 0x00000020 /* Has sampled slot in MMCRA */
#define PPMU_HAS_SIER 0x00000040 /* Has SIER */
#define PPMU_BHRB 0x00000080 /* has BHRB feature enabled */
#define PPMU_EBB 0x00000100 /* supports event based branch */
/*
* Values for flags to get_alternatives()
*/
#define PPMU_LIMITED_PMC_OK 1 /* can put this on a limited PMC */
#define PPMU_LIMITED_PMC_REQD 2 /* have to put this on a limited PMC */
#define PPMU_ONLY_COUNT_RUN 4 /* only counting in run state */
extern int register_power_pmu(struct power_pmu *);
struct pt_regs;
extern unsigned long perf_misc_flags(struct pt_regs *regs);
extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
extern unsigned long int read_bhrb(int n);
/*
* Only override the default definitions in include/linux/perf_event.h
* if we have hardware PMU support.
*/
#ifdef CONFIG_PPC_PERF_CTRS
#define perf_misc_flags(regs) perf_misc_flags(regs)
#endif
/*
* The power_pmu.get_constraint function returns a 32/64-bit value and
* a 32/64-bit mask that express the constraints between this event_id and
* other events.
*
* The value and mask are divided up into (non-overlapping) bitfields
* of three different types:
*
* Select field: this expresses the constraint that some set of bits
* in MMCR* needs to be set to a specific value for this event_id. For a
* select field, the mask contains 1s in every bit of the field, and
* the value contains a unique value for each possible setting of the
* MMCR* bits. The constraint checking code will ensure that two events
* that set the same field in their masks have the same value in their
* value dwords.
*
* Add field: this expresses the constraint that there can be at most
* N events in a particular class. A field of k bits can be used for
* N <= 2^(k-1) - 1. The mask has the most significant bit of the field
* set (and the other bits 0), and the value has only the least significant
* bit of the field set. In addition, the 'add_fields' and 'test_adder'
* in the struct power_pmu for this processor come into play. The
* add_fields value contains 1 in the LSB of the field, and the
* test_adder contains 2^(k-1) - 1 - N in the field.
*
* NAND field: this expresses the constraint that you may not have events
* in all of a set of classes. (For example, on PPC970, you can't select
* events from the FPU, ISU and IDU simultaneously, although any two are
* possible.) For N classes, the field is N+1 bits wide, and each class
* is assigned one bit from the least-significant N bits. The mask has
* only the most-significant bit set, and the value has only the bit
* for the event_id's class set. The test_adder has the least significant
* bit set in the field.
*
* If an event_id is not subject to the constraint expressed by a particular
* field, then it will have 0 in both the mask and value for that field.
*/
extern ssize_t power_events_sysfs_show(struct device *dev,
struct device_attribute *attr, char *page);
/*
* EVENT_VAR() is same as PMU_EVENT_VAR with a suffix.
*
* Having a suffix allows us to have aliases in sysfs - eg: the generic
* event 'cpu-cycles' can have two entries in sysfs: 'cpu-cycles' and
* 'PM_CYC' where the latter is the name by which the event is known in
* POWER CPU specification.
*/
#define EVENT_VAR(_id, _suffix) event_attr_##_id##_suffix
#define EVENT_PTR(_id, _suffix) &EVENT_VAR(_id, _suffix).attr.attr
#define EVENT_ATTR(_name, _id, _suffix) \
PMU_EVENT_ATTR(_name, EVENT_VAR(_id, _suffix), PME_##_id, \
power_events_sysfs_show)
#define GENERIC_EVENT_ATTR(_name, _id) EVENT_ATTR(_name, _id, _g)
#define GENERIC_EVENT_PTR(_id) EVENT_PTR(_id, _g)
#define POWER_EVENT_ATTR(_name, _id) EVENT_ATTR(_name, _id, _p)
#define POWER_EVENT_PTR(_id) EVENT_PTR(_id, _p)
