1 /* 2 * Performance event support - PowerPC classic/server specific definitions. 3 * 4 * Copyright 2008-2009 Paul Mackerras, IBM Corporation. 5 * 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. 10 */ 11 12 #include <linux/types.h> 13 #include <asm/hw_irq.h> 14 #include <linux/device.h> 15 16 #define MAX_HWEVENTS 8 17 #define MAX_EVENT_ALTERNATIVES 8 18 #define MAX_LIMITED_HWCOUNTERS 2 19 20 /* 21 * This struct provides the constants and functions needed to 22 * describe the PMU on a particular POWER-family CPU. 23 */ 24 struct power_pmu { 25 const char *name; 26 int n_counter; 27 int max_alternatives; 28 unsigned long add_fields; 29 unsigned long test_adder; 30 int (*compute_mmcr)(u64 events[], int n_ev, 31 unsigned int hwc[], unsigned long mmcr[]); 32 int (*get_constraint)(u64 event_id, unsigned long *mskp, 33 unsigned long *valp); 34 int (*get_alternatives)(u64 event_id, unsigned int flags, 35 u64 alt[]); 36 void (*disable_pmc)(unsigned int pmc, unsigned long mmcr[]); 37 int (*limited_pmc_event)(u64 event_id); 38 u32 flags; 39 const struct attribute_group **attr_groups; 40 int n_generic; 41 int *generic_events; 42 int (*cache_events)[PERF_COUNT_HW_CACHE_MAX] 43 [PERF_COUNT_HW_CACHE_OP_MAX] 44 [PERF_COUNT_HW_CACHE_RESULT_MAX]; 45 }; 46 47 /* 48 * Values for power_pmu.flags 49 */ 50 #define PPMU_LIMITED_PMC5_6 1 /* PMC5/6 have limited function */ 51 #define PPMU_ALT_SIPR 2 /* uses alternate posn for SIPR/HV */ 52 #define PPMU_NO_SIPR 4 /* no SIPR/HV in MMCRA at all */ 53 #define PPMU_NO_CONT_SAMPLING 8 /* no continuous sampling */ 54 #define PPMU_SIAR_VALID 16 /* Processor has SIAR Valid bit */ 55 56 /* 57 * Values for flags to get_alternatives() 58 */ 59 #define PPMU_LIMITED_PMC_OK 1 /* can put this on a limited PMC */ 60 #define PPMU_LIMITED_PMC_REQD 2 /* have to put this on a limited PMC */ 61 #define PPMU_ONLY_COUNT_RUN 4 /* only counting in run state */ 62 63 extern int register_power_pmu(struct power_pmu *); 64 65 struct pt_regs; 66 extern unsigned long perf_misc_flags(struct pt_regs *regs); 67 extern unsigned long perf_instruction_pointer(struct pt_regs *regs); 68 69 /* 70 * Only override the default definitions in include/linux/perf_event.h 71 * if we have hardware PMU support. 72 */ 73 #ifdef CONFIG_PPC_PERF_CTRS 74 #define perf_misc_flags(regs) perf_misc_flags(regs) 75 #endif 76 77 /* 78 * The power_pmu.get_constraint function returns a 32/64-bit value and 79 * a 32/64-bit mask that express the constraints between this event_id and 80 * other events. 81 * 82 * The value and mask are divided up into (non-overlapping) bitfields 83 * of three different types: 84 * 85 * Select field: this expresses the constraint that some set of bits 86 * in MMCR* needs to be set to a specific value for this event_id. For a 87 * select field, the mask contains 1s in every bit of the field, and 88 * the value contains a unique value for each possible setting of the 89 * MMCR* bits. The constraint checking code will ensure that two events 90 * that set the same field in their masks have the same value in their 91 * value dwords. 92 * 93 * Add field: this expresses the constraint that there can be at most 94 * N events in a particular class. A field of k bits can be used for 95 * N <= 2^(k-1) - 1. The mask has the most significant bit of the field 96 * set (and the other bits 0), and the value has only the least significant 97 * bit of the field set. In addition, the 'add_fields' and 'test_adder' 98 * in the struct power_pmu for this processor come into play. The 99 * add_fields value contains 1 in the LSB of the field, and the 100 * test_adder contains 2^(k-1) - 1 - N in the field. 101 * 102 * NAND field: this expresses the constraint that you may not have events 103 * in all of a set of classes. (For example, on PPC970, you can't select 104 * events from the FPU, ISU and IDU simultaneously, although any two are 105 * possible.) For N classes, the field is N+1 bits wide, and each class 106 * is assigned one bit from the least-significant N bits. The mask has 107 * only the most-significant bit set, and the value has only the bit 108 * for the event_id's class set. The test_adder has the least significant 109 * bit set in the field. 110 * 111 * If an event_id is not subject to the constraint expressed by a particular 112 * field, then it will have 0 in both the mask and value for that field. 113 */ 114 115 extern ssize_t power_events_sysfs_show(struct device *dev, 116 struct device_attribute *attr, char *page); 117 118 /* 119 * EVENT_VAR() is same as PMU_EVENT_VAR with a suffix. 120 * 121 * Having a suffix allows us to have aliases in sysfs - eg: the generic 122 * event 'cpu-cycles' can have two entries in sysfs: 'cpu-cycles' and 123 * 'PM_CYC' where the latter is the name by which the event is known in 124 * POWER CPU specification. 125 */ 126 #define EVENT_VAR(_id, _suffix) event_attr_##_id##_suffix 127 #define EVENT_PTR(_id, _suffix) &EVENT_VAR(_id, _suffix).attr.attr 128 129 #define EVENT_ATTR(_name, _id, _suffix) \ 130 PMU_EVENT_ATTR(_name, EVENT_VAR(_id, _suffix), PME_PM_##_id, \ 131 power_events_sysfs_show) 132 133 #define GENERIC_EVENT_ATTR(_name, _id) EVENT_ATTR(_name, _id, _g) 134 #define GENERIC_EVENT_PTR(_id) EVENT_PTR(_id, _g) 135 136 #define POWER_EVENT_ATTR(_name, _id) EVENT_ATTR(PM_##_name, _id, _p) 137 #define POWER_EVENT_PTR(_id) EVENT_PTR(_id, _p) 138