1ce447b90f
970 and Power4 don't support "continuous sampling" which means that when we aren't in marked instruction sampling mode (marked events), SIAR isn't updated with the last instruction sampled before the perf interrupt. On those processors, we must thus use the exception SRR0 value as the sampled instruction pointer. Those processors also don't support the SIPR and SIHV bits in MMCRA which means we need some kind of heuristic to decide if SIAR values represent kernel or user addresses. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
110 lines
4.1 KiB
C
110 lines
4.1 KiB
C
/*
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* Performance event support - PowerPC classic/server specific definitions.
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*
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* Copyright 2008-2009 Paul Mackerras, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/types.h>
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#include <asm/hw_irq.h>
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#define MAX_HWEVENTS 8
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#define MAX_EVENT_ALTERNATIVES 8
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#define MAX_LIMITED_HWCOUNTERS 2
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/*
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* This struct provides the constants and functions needed to
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* describe the PMU on a particular POWER-family CPU.
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*/
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struct power_pmu {
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const char *name;
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int n_counter;
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int max_alternatives;
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unsigned long add_fields;
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unsigned long test_adder;
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int (*compute_mmcr)(u64 events[], int n_ev,
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unsigned int hwc[], unsigned long mmcr[]);
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int (*get_constraint)(u64 event_id, unsigned long *mskp,
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unsigned long *valp);
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int (*get_alternatives)(u64 event_id, unsigned int flags,
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u64 alt[]);
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void (*disable_pmc)(unsigned int pmc, unsigned long mmcr[]);
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int (*limited_pmc_event)(u64 event_id);
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u32 flags;
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int n_generic;
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int *generic_events;
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int (*cache_events)[PERF_COUNT_HW_CACHE_MAX]
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[PERF_COUNT_HW_CACHE_OP_MAX]
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[PERF_COUNT_HW_CACHE_RESULT_MAX];
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};
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/*
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* Values for power_pmu.flags
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*/
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#define PPMU_LIMITED_PMC5_6 1 /* PMC5/6 have limited function */
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#define PPMU_ALT_SIPR 2 /* uses alternate posn for SIPR/HV */
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#define PPMU_NO_SIPR 4 /* no SIPR/HV in MMCRA at all */
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#define PPMU_NO_CONT_SAMPLING 8 /* no continuous sampling */
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/*
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* Values for flags to get_alternatives()
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*/
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#define PPMU_LIMITED_PMC_OK 1 /* can put this on a limited PMC */
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#define PPMU_LIMITED_PMC_REQD 2 /* have to put this on a limited PMC */
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#define PPMU_ONLY_COUNT_RUN 4 /* only counting in run state */
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extern int register_power_pmu(struct power_pmu *);
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struct pt_regs;
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extern unsigned long perf_misc_flags(struct pt_regs *regs);
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extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
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/*
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* Only override the default definitions in include/linux/perf_event.h
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* if we have hardware PMU support.
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*/
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#ifdef CONFIG_PPC_PERF_CTRS
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#define perf_misc_flags(regs) perf_misc_flags(regs)
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#endif
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/*
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* The power_pmu.get_constraint function returns a 32/64-bit value and
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* a 32/64-bit mask that express the constraints between this event_id and
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* other events.
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*
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* The value and mask are divided up into (non-overlapping) bitfields
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* of three different types:
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*
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* Select field: this expresses the constraint that some set of bits
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* in MMCR* needs to be set to a specific value for this event_id. For a
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* select field, the mask contains 1s in every bit of the field, and
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* the value contains a unique value for each possible setting of the
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* MMCR* bits. The constraint checking code will ensure that two events
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* that set the same field in their masks have the same value in their
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* value dwords.
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*
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* Add field: this expresses the constraint that there can be at most
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* N events in a particular class. A field of k bits can be used for
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* N <= 2^(k-1) - 1. The mask has the most significant bit of the field
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* set (and the other bits 0), and the value has only the least significant
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* bit of the field set. In addition, the 'add_fields' and 'test_adder'
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* in the struct power_pmu for this processor come into play. The
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* add_fields value contains 1 in the LSB of the field, and the
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* test_adder contains 2^(k-1) - 1 - N in the field.
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*
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* NAND field: this expresses the constraint that you may not have events
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* in all of a set of classes. (For example, on PPC970, you can't select
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* events from the FPU, ISU and IDU simultaneously, although any two are
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* possible.) For N classes, the field is N+1 bits wide, and each class
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* is assigned one bit from the least-significant N bits. The mask has
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* only the most-significant bit set, and the value has only the bit
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* for the event_id's class set. The test_adder has the least significant
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* bit set in the field.
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*
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* If an event_id is not subject to the constraint expressed by a particular
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* field, then it will have 0 in both the mask and value for that field.
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*/
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