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 /* Update perf_event_print_debug() if this changes */
  18 #define MAX_HWEVENTS            8
  19 #define MAX_EVENT_ALTERNATIVES  8
  20 #define MAX_LIMITED_HWCOUNTERS  2
  21
  22 struct perf_event;
  23
  24 /*
  25  * This struct provides the constants and functions needed to
  26  * describe the PMU on a particular POWER-family CPU.
  27  */
  28 struct power_pmu {
  29         const char      *name;
  30         int             n_counter;
  31         int             max_alternatives;
  32         unsigned long   add_fields;
  33         unsigned long   test_adder;
  34         int             (*compute_mmcr)(u64 events[], int n_ev,
  35                                 unsigned int hwc[], unsigned long mmcr[],
  36                                 struct perf_event *pevents[]);
  37         int             (*get_constraint)(u64 event_id, unsigned long *mskp,
  38                                 unsigned long *valp);
  39         int             (*get_alternatives)(u64 event_id, unsigned int flags,
  40                                 u64 alt[]);
  41         u64             (*bhrb_filter_map)(u64 branch_sample_type);
  42         void            (*config_bhrb)(u64 pmu_bhrb_filter);
  43         void            (*disable_pmc)(unsigned int pmc, unsigned long mmcr[]);
  44         int             (*limited_pmc_event)(u64 event_id);
  45         u32             flags;
  46         const struct attribute_group    **attr_groups;
  47         int             n_generic;
  48         int             *generic_events;
  49         int             (*cache_events)[PERF_COUNT_HW_CACHE_MAX]
  50                                [PERF_COUNT_HW_CACHE_OP_MAX]
  51                                [PERF_COUNT_HW_CACHE_RESULT_MAX];
  52
  53         /* BHRB entries in the PMU */
  54         int             bhrb_nr;
  55 };
  56
  57 /*
  58  * Values for power_pmu.flags
  59  */
  60 #define PPMU_LIMITED_PMC5_6     0x00000001 /* PMC5/6 have limited function */
  61 #define PPMU_ALT_SIPR           0x00000002 /* uses alternate posn for SIPR/HV */
  62 #define PPMU_NO_SIPR            0x00000004 /* no SIPR/HV in MMCRA at all */
  63 #define PPMU_NO_CONT_SAMPLING   0x00000008 /* no continuous sampling */
  64 #define PPMU_SIAR_VALID         0x00000010 /* Processor has SIAR Valid bit */
  65 #define PPMU_HAS_SSLOT          0x00000020 /* Has sampled slot in MMCRA */
  66 #define PPMU_HAS_SIER           0x00000040 /* Has SIER */
  67 #define PPMU_ARCH_207S          0x00000080 /* PMC is architecture v2.07S */
  68
  69 /*
  70  * Values for flags to get_alternatives()
  71  */
  72 #define PPMU_LIMITED_PMC_OK     1       /* can put this on a limited PMC */
  73 #define PPMU_LIMITED_PMC_REQD   2       /* have to put this on a limited PMC */
  74 #define PPMU_ONLY_COUNT_RUN     4       /* only counting in run state */
  75
  76 extern int register_power_pmu(struct power_pmu *);
  77
  78 struct pt_regs;
  79 extern unsigned long perf_misc_flags(struct pt_regs *regs);
  80 extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
  81 extern unsigned long int read_bhrb(int n);
  82
  83 /*
  84  * Only override the default definitions in include/linux/perf_event.h
  85  * if we have hardware PMU support.
  86  */
  87 #ifdef CONFIG_PPC_PERF_CTRS
  88 #define perf_misc_flags(regs)   perf_misc_flags(regs)
  89 #endif
  90
  91 /*
  92  * The power_pmu.get_constraint function returns a 32/64-bit value and
  93  * a 32/64-bit mask that express the constraints between this event_id and
  94  * other events.
  95  *
  96  * The value and mask are divided up into (non-overlapping) bitfields
  97  * of three different types:
  98  *
  99  * Select field: this expresses the constraint that some set of bits
 100  * in MMCR* needs to be set to a specific value for this event_id.  For a
 101  * select field, the mask contains 1s in every bit of the field, and
 102  * the value contains a unique value for each possible setting of the
 103  * MMCR* bits.  The constraint checking code will ensure that two events
 104  * that set the same field in their masks have the same value in their
 105  * value dwords.
 106  *
 107  * Add field: this expresses the constraint that there can be at most
 108  * N events in a particular class.  A field of k bits can be used for
 109  * N <= 2^(k-1) - 1.  The mask has the most significant bit of the field
 110  * set (and the other bits 0), and the value has only the least significant
 111  * bit of the field set.  In addition, the 'add_fields' and 'test_adder'
 112  * in the struct power_pmu for this processor come into play.  The
 113  * add_fields value contains 1 in the LSB of the field, and the
 114  * test_adder contains 2^(k-1) - 1 - N in the field.
 115  *
 116  * NAND field: this expresses the constraint that you may not have events
 117  * in all of a set of classes.  (For example, on PPC970, you can't select
 118  * events from the FPU, ISU and IDU simultaneously, although any two are
 119  * possible.)  For N classes, the field is N+1 bits wide, and each class
 120  * is assigned one bit from the least-significant N bits.  The mask has
 121  * only the most-significant bit set, and the value has only the bit
 122  * for the event_id's class set.  The test_adder has the least significant
 123  * bit set in the field.
 124  *
 125  * If an event_id is not subject to the constraint expressed by a particular
 126  * field, then it will have 0 in both the mask and value for that field.
 127  */
 128
 129 extern ssize_t power_events_sysfs_show(struct device *dev,
 130                                 struct device_attribute *attr, char *page);
 131
 132 /*
 133  * EVENT_VAR() is same as PMU_EVENT_VAR with a suffix.
 134  *
 135  * Having a suffix allows us to have aliases in sysfs - eg: the generic
 136  * event 'cpu-cycles' can have two entries in sysfs: 'cpu-cycles' and
 137  * 'PM_CYC' where the latter is the name by which the event is known in
 138  * POWER CPU specification.
 139  */
 140 #define EVENT_VAR(_id, _suffix)         event_attr_##_id##_suffix
 141 #define EVENT_PTR(_id, _suffix)         &EVENT_VAR(_id, _suffix).attr.attr
 142
 143 #define EVENT_ATTR(_name, _id, _suffix)                                 \
 144         PMU_EVENT_ATTR(_name, EVENT_VAR(_id, _suffix), PME_##_id,       \
 145                         power_events_sysfs_show)
 146
 147 #define GENERIC_EVENT_ATTR(_name, _id)  EVENT_ATTR(_name, _id, _g)
 148 #define GENERIC_EVENT_PTR(_id)          EVENT_PTR(_id, _g)
 149
 150 #define POWER_EVENT_ATTR(_name, _id)    EVENT_ATTR(_name, _id, _p)
 151 #define POWER_EVENT_PTR(_id)            EVENT_PTR(_id, _p)