arch/powerpc/include/asm/perf_event_server.h

   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 #include <uapi/asm/perf_event.h>
  16
  17 #define MAX_HWEVENTS            8
  18 #define MAX_EVENT_ALTERNATIVES  8
  19 #define MAX_LIMITED_HWCOUNTERS  2
  20
  21 /*
  22  * This struct provides the constants and functions needed to
  23  * describe the PMU on a particular POWER-family CPU.
  24  */
  25 struct power_pmu {
  26         const char      *name;
  27         int             n_counter;
  28         int             max_alternatives;
  29         unsigned long   add_fields;
  30         unsigned long   test_adder;
  31         int             (*compute_mmcr)(u64 events[], int n_ev,
  32                                 unsigned int hwc[], unsigned long mmcr[]);
  33         int             (*get_constraint)(u64 event_id, unsigned long *mskp,
  34                                 unsigned long *valp);
  35         int             (*get_alternatives)(u64 event_id, unsigned int flags,
  36                                 u64 alt[]);
  37         u64             (*bhrb_filter_map)(u64 branch_sample_type);
  38         void            (*config_bhrb)(u64 pmu_bhrb_filter);
  39         void            (*disable_pmc)(unsigned int pmc, unsigned long mmcr[]);
  40         int             (*limited_pmc_event)(u64 event_id);
  41         u32             flags;
  42         const struct attribute_group    **attr_groups;
  43         int             n_generic;
  44         int             *generic_events;
  45         int             (*cache_events)[PERF_COUNT_HW_CACHE_MAX]
  46                                [PERF_COUNT_HW_CACHE_OP_MAX]
  47                                [PERF_COUNT_HW_CACHE_RESULT_MAX];
  48
  49         /* BHRB entries in the PMU */
  50         int             bhrb_nr;
  51 };
  52
  53 /*
  54  * Values for power_pmu.flags
  55  */
  56 #define PPMU_LIMITED_PMC5_6     0x00000001 /* PMC5/6 have limited function */
  57 #define PPMU_ALT_SIPR           0x00000002 /* uses alternate posn for SIPR/HV */
  58 #define PPMU_NO_SIPR            0x00000004 /* no SIPR/HV in MMCRA at all */
  59 #define PPMU_NO_CONT_SAMPLING   0x00000008 /* no continuous sampling */
  60 #define PPMU_SIAR_VALID         0x00000010 /* Processor has SIAR Valid bit */
  61 #define PPMU_HAS_SSLOT          0x00000020 /* Has sampled slot in MMCRA */
  62 #define PPMU_HAS_SIER           0x00000040 /* Has SIER */
  63 #define PPMU_BHRB               0x00000080 /* has BHRB feature enabled */
  64 #define PPMU_EBB                0x00000100 /* supports event based branch */
  65
  66 /*
  67  * Values for flags to get_alternatives()
  68  */
  69 #define PPMU_LIMITED_PMC_OK     1       /* can put this on a limited PMC */
  70 #define PPMU_LIMITED_PMC_REQD   2       /* have to put this on a limited PMC */
  71 #define PPMU_ONLY_COUNT_RUN     4       /* only counting in run state */
  72
  73 extern int register_power_pmu(struct power_pmu *);
  74
  75 struct pt_regs;
  76 extern unsigned long perf_misc_flags(struct pt_regs *regs);
  77 extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
  78 extern unsigned long int read_bhrb(int n);
  79
  80 /*
  81  * Only override the default definitions in include/linux/perf_event.h
  82  * if we have hardware PMU support.
  83  */
  84 #ifdef CONFIG_PPC_PERF_CTRS
  85 #define perf_misc_flags(regs)   perf_misc_flags(regs)
  86 #endif
  87
  88 /*
  89  * The power_pmu.get_constraint function returns a 32/64-bit value and
  90  * a 32/64-bit mask that express the constraints between this event_id and
  91  * other events.
  92  *
  93  * The value and mask are divided up into (non-overlapping) bitfields
  94  * of three different types:
  95  *
  96  * Select field: this expresses the constraint that some set of bits
  97  * in MMCR* needs to be set to a specific value for this event_id.  For a
  98  * select field, the mask contains 1s in every bit of the field, and
  99  * the value contains a unique value for each possible setting of the
 100  * MMCR* bits.  The constraint checking code will ensure that two events
 101  * that set the same field in their masks have the same value in their
 102  * value dwords.
 103  *
 104  * Add field: this expresses the constraint that there can be at most
 105  * N events in a particular class.  A field of k bits can be used for
 106  * N <= 2^(k-1) - 1.  The mask has the most significant bit of the field
 107  * set (and the other bits 0), and the value has only the least significant
 108  * bit of the field set.  In addition, the 'add_fields' and 'test_adder'
 109  * in the struct power_pmu for this processor come into play.  The
 110  * add_fields value contains 1 in the LSB of the field, and the
 111  * test_adder contains 2^(k-1) - 1 - N in the field.
 112  *
 113  * NAND field: this expresses the constraint that you may not have events
 114  * in all of a set of classes.  (For example, on PPC970, you can't select
 115  * events from the FPU, ISU and IDU simultaneously, although any two are
 116  * possible.)  For N classes, the field is N+1 bits wide, and each class
 117  * is assigned one bit from the least-significant N bits.  The mask has
 118  * only the most-significant bit set, and the value has only the bit
 119  * for the event_id's class set.  The test_adder has the least significant
 120  * bit set in the field.
 121  *
 122  * If an event_id is not subject to the constraint expressed by a particular
 123  * field, then it will have 0 in both the mask and value for that field.
 124  */
 125
 126 extern ssize_t power_events_sysfs_show(struct device *dev,
 127                                 struct device_attribute *attr, char *page);
 128
 129 /*
 130  * EVENT_VAR() is same as PMU_EVENT_VAR with a suffix.
 131  *
 132  * Having a suffix allows us to have aliases in sysfs - eg: the generic
 133  * event 'cpu-cycles' can have two entries in sysfs: 'cpu-cycles' and
 134  * 'PM_CYC' where the latter is the name by which the event is known in
 135  * POWER CPU specification.
 136  */
 137 #define EVENT_VAR(_id, _suffix)         event_attr_##_id##_suffix
 138 #define EVENT_PTR(_id, _suffix)         &EVENT_VAR(_id, _suffix).attr.attr
 139
 140 #define EVENT_ATTR(_name, _id, _suffix)                                 \
 141         PMU_EVENT_ATTR(_name, EVENT_VAR(_id, _suffix), PME_##_id,       \
 142                         power_events_sysfs_show)
 143
 144 #define GENERIC_EVENT_ATTR(_name, _id)  EVENT_ATTR(_name, _id, _g)
 145 #define GENERIC_EVENT_PTR(_id)          EVENT_PTR(_id, _g)
 146
 147 #define POWER_EVENT_ATTR(_name, _id)    EVENT_ATTR(_name, _id, _p)
 148 #define POWER_EVENT_PTR(_id)            EVENT_PTR(_id, _p)