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 #define MAX_HWCOUNTERS 8
14 #define MAX_EVENT_ALTERNATIVES 8
15 #define MAX_LIMITED_HWCOUNTERS 2
18 * This struct provides the constants and functions needed to
19 * describe the PMU on a particular POWER-family CPU.
26 int (*compute_mmcr)(u64 events[], int n_ev,
27 unsigned int hwc[], u64 mmcr[]);
28 int (*get_constraint)(u64 event, u64 *mskp, u64 *valp);
29 int (*get_alternatives)(u64 event, unsigned int flags,
31 void (*disable_pmc)(unsigned int pmc, u64 mmcr[]);
32 int (*limited_pmc_event)(u64 event);
36 int (*cache_events)[PERF_COUNT_HW_CACHE_MAX]
37 [PERF_COUNT_HW_CACHE_OP_MAX]
38 [PERF_COUNT_HW_CACHE_RESULT_MAX];
41 extern struct power_pmu *ppmu;
44 * Values for power_pmu.flags
46 #define PPMU_LIMITED_PMC5_6 1 /* PMC5/6 have limited function */
47 #define PPMU_ALT_SIPR 2 /* uses alternate posn for SIPR/HV */
50 * Values for flags to get_alternatives()
52 #define PPMU_LIMITED_PMC_OK 1 /* can put this on a limited PMC */
53 #define PPMU_LIMITED_PMC_REQD 2 /* have to put this on a limited PMC */
54 #define PPMU_ONLY_COUNT_RUN 4 /* only counting in run state */
57 extern unsigned long perf_misc_flags(struct pt_regs *regs);
58 #define perf_misc_flags(regs) perf_misc_flags(regs)
60 extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
63 * The power_pmu.get_constraint function returns a 64-bit value and
64 * a 64-bit mask that express the constraints between this event and
67 * The value and mask are divided up into (non-overlapping) bitfields
68 * of three different types:
70 * Select field: this expresses the constraint that some set of bits
71 * in MMCR* needs to be set to a specific value for this event. For a
72 * select field, the mask contains 1s in every bit of the field, and
73 * the value contains a unique value for each possible setting of the
74 * MMCR* bits. The constraint checking code will ensure that two events
75 * that set the same field in their masks have the same value in their
78 * Add field: this expresses the constraint that there can be at most
79 * N events in a particular class. A field of k bits can be used for
80 * N <= 2^(k-1) - 1. The mask has the most significant bit of the field
81 * set (and the other bits 0), and the value has only the least significant
82 * bit of the field set. In addition, the 'add_fields' and 'test_adder'
83 * in the struct power_pmu for this processor come into play. The
84 * add_fields value contains 1 in the LSB of the field, and the
85 * test_adder contains 2^(k-1) - 1 - N in the field.
87 * NAND field: this expresses the constraint that you may not have events
88 * in all of a set of classes. (For example, on PPC970, you can't select
89 * events from the FPU, ISU and IDU simultaneously, although any two are
90 * possible.) For N classes, the field is N+1 bits wide, and each class
91 * is assigned one bit from the least-significant N bits. The mask has
92 * only the most-significant bit set, and the value has only the bit
93 * for the event's class set. The test_adder has the least significant
94 * bit set in the field.
96 * If an event is not subject to the constraint expressed by a particular
97 * field, then it will have 0 in both the mask and value for that field.