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 u64 (*bhrb_filter_map)(u64 branch_sample_type); 37 void (*config_bhrb)(u64 pmu_bhrb_filter); 38 void (*disable_pmc)(unsigned int pmc, unsigned long mmcr[]); 39 int (*limited_pmc_event)(u64 event_id); 40 u32 flags; 41 const struct attribute_group **attr_groups; 42 int n_generic; 43 int *generic_events; 44 int (*cache_events)[PERF_COUNT_HW_CACHE_MAX] 45 [PERF_COUNT_HW_CACHE_OP_MAX] 46 [PERF_COUNT_HW_CACHE_RESULT_MAX]; 47 48 /* BHRB entries in the PMU */ 49 int bhrb_nr; 50 }; 51 52 /* 53 * Values for power_pmu.flags 54 */ 55 #define PPMU_LIMITED_PMC5_6 0x00000001 /* PMC5/6 have limited function */ 56 #define PPMU_ALT_SIPR 0x00000002 /* uses alternate posn for SIPR/HV */ 57 #define PPMU_NO_SIPR 0x00000004 /* no SIPR/HV in MMCRA at all */ 58 #define PPMU_NO_CONT_SAMPLING 0x00000008 /* no continuous sampling */ 59 #define PPMU_SIAR_VALID 0x00000010 /* Processor has SIAR Valid bit */ 60 #define PPMU_HAS_SSLOT 0x00000020 /* Has sampled slot in MMCRA */ 61 #define PPMU_HAS_SIER 0x00000040 /* Has SIER */ 62 #define PPMU_BHRB 0x00000080 /* has BHRB feature enabled */ 63 #define PPMU_EBB 0x00000100 /* supports event based branch */ 64 65 /* 66 * Values for flags to get_alternatives() 67 */ 68 #define PPMU_LIMITED_PMC_OK 1 /* can put this on a limited PMC */ 69 #define PPMU_LIMITED_PMC_REQD 2 /* have to put this on a limited PMC */ 70 #define PPMU_ONLY_COUNT_RUN 4 /* only counting in run state */ 71 72 /* 73 * We use the event config bit 63 as a flag to request EBB. 74 */ 75 #define EVENT_CONFIG_EBB_SHIFT 63 76 77 extern int register_power_pmu(struct power_pmu *); 78 79 struct pt_regs; 80 extern unsigned long perf_misc_flags(struct pt_regs *regs); 81 extern unsigned long perf_instruction_pointer(struct pt_regs *regs); 82 extern unsigned long int read_bhrb(int n); 83 84 /* 85 * Only override the default definitions in include/linux/perf_event.h 86 * if we have hardware PMU support. 87 */ 88 #ifdef CONFIG_PPC_PERF_CTRS 89 #define perf_misc_flags(regs) perf_misc_flags(regs) 90 #endif 91 92 /* 93 * The power_pmu.get_constraint function returns a 32/64-bit value and 94 * a 32/64-bit mask that express the constraints between this event_id and 95 * other events. 96 * 97 * The value and mask are divided up into (non-overlapping) bitfields 98 * of three different types: 99 * 100 * Select field: this expresses the constraint that some set of bits 101 * in MMCR* needs to be set to a specific value for this event_id. For a 102 * select field, the mask contains 1s in every bit of the field, and 103 * the value contains a unique value for each possible setting of the 104 * MMCR* bits. The constraint checking code will ensure that two events 105 * that set the same field in their masks have the same value in their 106 * value dwords. 107 * 108 * Add field: this expresses the constraint that there can be at most 109 * N events in a particular class. A field of k bits can be used for 110 * N <= 2^(k-1) - 1. The mask has the most significant bit of the field 111 * set (and the other bits 0), and the value has only the least significant 112 * bit of the field set. In addition, the 'add_fields' and 'test_adder' 113 * in the struct power_pmu for this processor come into play. The 114 * add_fields value contains 1 in the LSB of the field, and the 115 * test_adder contains 2^(k-1) - 1 - N in the field. 116 * 117 * NAND field: this expresses the constraint that you may not have events 118 * in all of a set of classes. (For example, on PPC970, you can't select 119 * events from the FPU, ISU and IDU simultaneously, although any two are 120 * possible.) For N classes, the field is N+1 bits wide, and each class 121 * is assigned one bit from the least-significant N bits. The mask has 122 * only the most-significant bit set, and the value has only the bit 123 * for the event_id's class set. The test_adder has the least significant 124 * bit set in the field. 125 * 126 * If an event_id is not subject to the constraint expressed by a particular 127 * field, then it will have 0 in both the mask and value for that field. 128 */ 129 130 extern ssize_t power_events_sysfs_show(struct device *dev, 131 struct device_attribute *attr, char *page); 132 133 /* 134 * EVENT_VAR() is same as PMU_EVENT_VAR with a suffix. 135 * 136 * Having a suffix allows us to have aliases in sysfs - eg: the generic 137 * event 'cpu-cycles' can have two entries in sysfs: 'cpu-cycles' and 138 * 'PM_CYC' where the latter is the name by which the event is known in 139 * POWER CPU specification. 140 */ 141 #define EVENT_VAR(_id, _suffix) event_attr_##_id##_suffix 142 #define EVENT_PTR(_id, _suffix) &EVENT_VAR(_id, _suffix).attr.attr 143 144 #define EVENT_ATTR(_name, _id, _suffix) \ 145 PMU_EVENT_ATTR(_name, EVENT_VAR(_id, _suffix), PME_PM_##_id, \ 146 power_events_sysfs_show) 147 148 #define GENERIC_EVENT_ATTR(_name, _id) EVENT_ATTR(_name, _id, _g) 149 #define GENERIC_EVENT_PTR(_id) EVENT_PTR(_id, _g) 150 151 #define POWER_EVENT_ATTR(_name, _id) EVENT_ATTR(PM_##_name, _id, _p) 152 #define POWER_EVENT_PTR(_id) EVENT_PTR(_id, _p) 153