arch/powerpc/include/asm/imc-pmu.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef __ASM_POWERPC_IMC_PMU_H
   3 #define __ASM_POWERPC_IMC_PMU_H
   4
   5 /*
   6  * IMC Nest Performance Monitor counter support.
   7  *
   8  * Copyright (C) 2017 Madhavan Srinivasan, IBM Corporation.
   9  *           (C) 2017 Anju T Sudhakar, IBM Corporation.
  10  *           (C) 2017 Hemant K Shaw, IBM Corporation.
  11  */
  12
  13 #include <linux/perf_event.h>
  14 #include <linux/slab.h>
  15 #include <linux/of.h>
  16 #include <linux/io.h>
  17 #include <asm/opal.h>
  18
  19 /*
  20  * Compatibility macros for IMC devices
  21  */
  22 #define IMC_DTB_COMPAT                  "ibm,opal-in-memory-counters"
  23 #define IMC_DTB_UNIT_COMPAT             "ibm,imc-counters"
  24
  25
  26 /*
  27  * LDBAR: Counter address and Enable/Disable macro.
  28  * perf/imc-pmu.c has the LDBAR layout information.
  29  */
  30 #define THREAD_IMC_LDBAR_MASK           0x0003ffffffffe000ULL
  31 #define THREAD_IMC_ENABLE               0x8000000000000000ULL
  32 #define TRACE_IMC_ENABLE                0x4000000000000000ULL
  33
  34 /*
  35  * For debugfs interface for imc-mode and imc-command
  36  */
  37 #define IMC_CNTL_BLK_OFFSET             0x3FC00
  38 #define IMC_CNTL_BLK_CMD_OFFSET         8
  39 #define IMC_CNTL_BLK_MODE_OFFSET        32
  40
  41 /*
  42  * Structure to hold memory address information for imc units.
  43  */
  44 struct imc_mem_info {
  45         u64 *vbase;
  46         u32 id;
  47 };
  48
  49 /*
  50  * Place holder for nest pmu events and values.
  51  */
  52 struct imc_events {
  53         u32 value;
  54         char *name;
  55         char *unit;
  56         char *scale;
  57 };
  58
  59 /*
  60  * Trace IMC hardware updates a 64bytes record on
  61  * Core Performance Monitoring Counter (CPMC)
  62  * overflow. Here is the layout for the trace imc record
  63  *
  64  * DW 0 : Timebase
  65  * DW 1 : Program Counter
  66  * DW 2 : PIDR information
  67  * DW 3 : CPMC1
  68  * DW 4 : CPMC2
  69  * DW 5 : CPMC3
  70  * Dw 6 : CPMC4
  71  * DW 7 : Timebase
  72  * .....
  73  *
  74  * The following is the data structure to hold trace imc data.
  75  */
  76 struct trace_imc_data {
  77         u64 tb1;
  78         u64 ip;
  79         u64 val;
  80         u64 cpmc1;
  81         u64 cpmc2;
  82         u64 cpmc3;
  83         u64 cpmc4;
  84         u64 tb2;
  85 };
  86
  87 /* Event attribute array index */
  88 #define IMC_FORMAT_ATTR         0
  89 #define IMC_EVENT_ATTR          1
  90 #define IMC_CPUMASK_ATTR        2
  91 #define IMC_NULL_ATTR           3
  92
  93 /* PMU Format attribute macros */
  94 #define IMC_EVENT_OFFSET_MASK   0xffffffffULL
  95
  96 /*
  97  * Macro to mask bits 0:21 of first double word(which is the timebase) to
  98  * compare with 8th double word (timebase) of trace imc record data.
  99  */
 100 #define IMC_TRACE_RECORD_TB1_MASK      0x3ffffffffffULL
 101
 102
 103 /*
 104  * Device tree parser code detects IMC pmu support and
 105  * registers new IMC pmus. This structure will hold the
 106  * pmu functions, events, counter memory information
 107  * and attrs for each imc pmu and will be referenced at
 108  * the time of pmu registration.
 109  */
 110 struct imc_pmu {
 111         struct pmu pmu;
 112         struct imc_mem_info *mem_info;
 113         struct imc_events *events;
 114         /*
 115          * Attribute groups for the PMU. Slot 0 used for
 116          * format attribute, slot 1 used for cpusmask attribute,
 117          * slot 2 used for event attribute. Slot 3 keep as
 118          * NULL.
 119          */
 120         const struct attribute_group *attr_groups[4];
 121         u32 counter_mem_size;
 122         int domain;
 123         /*
 124          * flag to notify whether the memory is mmaped
 125          * or allocated by kernel.
 126          */
 127         bool imc_counter_mmaped;
 128 };
 129
 130 /*
 131  * Structure to hold id, lock and reference count for the imc events which
 132  * are inited.
 133  */
 134 struct imc_pmu_ref {
 135         struct mutex lock;
 136         unsigned int id;
 137         int refc;
 138 };
 139
 140 /*
 141  * In-Memory Collection Counters type.
 142  * Data comes from Device tree.
 143  * Three device type are supported.
 144  */
 145
 146 enum {
 147         IMC_TYPE_THREAD         = 0x1,
 148         IMC_TYPE_TRACE          = 0x2,
 149         IMC_TYPE_CORE           = 0x4,
 150         IMC_TYPE_CHIP           = 0x10,
 151 };
 152
 153 /*
 154  * Domains for IMC PMUs
 155  */
 156 #define IMC_DOMAIN_NEST         1
 157 #define IMC_DOMAIN_CORE         2
 158 #define IMC_DOMAIN_THREAD       3
 159 /* For trace-imc the domain is still thread but it operates in trace-mode */
 160 #define IMC_DOMAIN_TRACE        4
 161
 162 extern int init_imc_pmu(struct device_node *parent,
 163                                 struct imc_pmu *pmu_ptr, int pmu_id);
 164 extern void thread_imc_disable(void);
 165 extern int get_max_nest_dev(void);
 166 extern void unregister_thread_imc(void);
 167 #endif /* __ASM_POWERPC_IMC_PMU_H */