2 * Performance counter support - PowerPC-specific definitions.
4 * Copyright 2008-2009 Paul Mackerras, IBM Corporation.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
11 #include <linux/types.h>
13 #include <asm/hw_irq.h>
15 #define MAX_HWCOUNTERS 8
16 #define MAX_EVENT_ALTERNATIVES 8
17 #define MAX_LIMITED_HWCOUNTERS 2
20 * This struct provides the constants and functions needed to
21 * describe the PMU on a particular POWER-family CPU.
27 unsigned long add_fields;
28 unsigned long test_adder;
29 int (*compute_mmcr)(u64 events[], int n_ev,
30 unsigned int hwc[], unsigned long mmcr[]);
31 int (*get_constraint)(u64 event, unsigned long *mskp,
33 int (*get_alternatives)(u64 event, unsigned int flags,
35 void (*disable_pmc)(unsigned int pmc, unsigned long mmcr[]);
36 int (*limited_pmc_event)(u64 event);
40 int (*cache_events)[PERF_COUNT_HW_CACHE_MAX]
41 [PERF_COUNT_HW_CACHE_OP_MAX]
42 [PERF_COUNT_HW_CACHE_RESULT_MAX];
46 * Values for power_pmu.flags
48 #define PPMU_LIMITED_PMC5_6 1 /* PMC5/6 have limited function */
49 #define PPMU_ALT_SIPR 2 /* uses alternate posn for SIPR/HV */
52 * Values for flags to get_alternatives()
54 #define PPMU_LIMITED_PMC_OK 1 /* can put this on a limited PMC */
55 #define PPMU_LIMITED_PMC_REQD 2 /* have to put this on a limited PMC */
56 #define PPMU_ONLY_COUNT_RUN 4 /* only counting in run state */
58 extern int register_power_pmu(struct power_pmu *);
61 extern unsigned long perf_misc_flags(struct pt_regs *regs);
62 extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
65 * Only override the default definitions in include/linux/perf_counter.h
66 * if we have hardware PMU support.
68 #ifdef CONFIG_PPC_PERF_CTRS
69 #define perf_misc_flags(regs) perf_misc_flags(regs)
73 * The power_pmu.get_constraint function returns a 32/64-bit value and
74 * a 32/64-bit mask that express the constraints between this event and
77 * The value and mask are divided up into (non-overlapping) bitfields
78 * of three different types:
80 * Select field: this expresses the constraint that some set of bits
81 * in MMCR* needs to be set to a specific value for this event. For a
82 * select field, the mask contains 1s in every bit of the field, and
83 * the value contains a unique value for each possible setting of the
84 * MMCR* bits. The constraint checking code will ensure that two events
85 * that set the same field in their masks have the same value in their
88 * Add field: this expresses the constraint that there can be at most
89 * N events in a particular class. A field of k bits can be used for
90 * N <= 2^(k-1) - 1. The mask has the most significant bit of the field
91 * set (and the other bits 0), and the value has only the least significant
92 * bit of the field set. In addition, the 'add_fields' and 'test_adder'
93 * in the struct power_pmu for this processor come into play. The
94 * add_fields value contains 1 in the LSB of the field, and the
95 * test_adder contains 2^(k-1) - 1 - N in the field.
97 * NAND field: this expresses the constraint that you may not have events
98 * in all of a set of classes. (For example, on PPC970, you can't select
99 * events from the FPU, ISU and IDU simultaneously, although any two are
100 * possible.) For N classes, the field is N+1 bits wide, and each class
101 * is assigned one bit from the least-significant N bits. The mask has
102 * only the most-significant bit set, and the value has only the bit
103 * for the event's class set. The test_adder has the least significant
104 * bit set in the field.
106 * If an event is not subject to the constraint expressed by a particular
107 * field, then it will have 0 in both the mask and value for that field.