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 15 #define MAX_HWEVENTS 8 16 #define MAX_EVENT_ALTERNATIVES 8 17 #define MAX_LIMITED_HWCOUNTERS 2 18 19 /* 20 * This struct provides the constants and functions needed to 21 * describe the PMU on a particular POWER-family CPU. 22 */ 23 struct power_pmu { 24 const char *name; 25 int n_counter; 26 int max_alternatives; 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_id, unsigned long *mskp, 32 unsigned long *valp); 33 int (*get_alternatives)(u64 event_id, unsigned int flags, 34 u64 alt[]); 35 void (*disable_pmc)(unsigned int pmc, unsigned long mmcr[]); 36 int (*limited_pmc_event)(u64 event_id); 37 u32 flags; 38 int n_generic; 39 int *generic_events; 40 int (*cache_events)[PERF_COUNT_HW_CACHE_MAX] 41 [PERF_COUNT_HW_CACHE_OP_MAX] 42 [PERF_COUNT_HW_CACHE_RESULT_MAX]; 43 }; 44 45 /* 46 * Values for power_pmu.flags 47 */ 48 #define PPMU_LIMITED_PMC5_6 1 /* PMC5/6 have limited function */ 49 #define PPMU_ALT_SIPR 2 /* uses alternate posn for SIPR/HV */ 50 51 /* 52 * Values for flags to get_alternatives() 53 */ 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 */ 57 58 extern int register_power_pmu(struct power_pmu *); 59 60 struct pt_regs; 61 extern unsigned long perf_misc_flags(struct pt_regs *regs); 62 extern unsigned long perf_instruction_pointer(struct pt_regs *regs); 63 64 /* 65 * Only override the default definitions in include/linux/perf_event.h 66 * if we have hardware PMU support. 67 */ 68 #ifdef CONFIG_PPC_PERF_CTRS 69 #define perf_misc_flags(regs) perf_misc_flags(regs) 70 #endif 71 72 /* 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_id and 75 * other events. 76 * 77 * The value and mask are divided up into (non-overlapping) bitfields 78 * of three different types: 79 * 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_id. 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 86 * value dwords. 87 * 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. 96 * 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_id's class set. The test_adder has the least significant 104 * bit set in the field. 105 * 106 * If an event_id 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. 108 */ 109