drivers/hwtracing/coresight/coresight-cfg-afdo.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright(C) 2020 Linaro Limited. All rights reserved.
   4  * Author: Mike Leach <mike.leach@linaro.org>
   5  */
   6
   7 #include "coresight-config.h"
   8
   9 /* ETMv4 includes and features */
  10 #if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X)
  11 #include "coresight-etm4x-cfg.h"
  12 #include "coresight-cfg-preload.h"
  13
  14 /* preload configurations and features */
  15
  16 /* preload in features for ETMv4 */
  17
  18 /* strobe feature */
  19 static struct cscfg_parameter_desc strobe_params[] = {
  20         {
  21                 .name = "window",
  22                 .value = 5000,
  23         },
  24         {
  25                 .name = "period",
  26                 .value = 10000,
  27         },
  28 };
  29
  30 static struct cscfg_regval_desc strobe_regs[] = {
  31         /* resource selectors */
  32         {
  33                 .type = CS_CFG_REG_TYPE_RESOURCE,
  34                 .offset = TRCRSCTLRn(2),
  35                 .hw_info = ETM4_CFG_RES_SEL,
  36                 .val32 = 0x20001,
  37         },
  38         {
  39                 .type = CS_CFG_REG_TYPE_RESOURCE,
  40                 .offset = TRCRSCTLRn(3),
  41                 .hw_info = ETM4_CFG_RES_SEQ,
  42                 .val32 = 0x20002,
  43         },
  44         /* strobe window counter 0 - reload from param 0 */
  45         {
  46                 .type = CS_CFG_REG_TYPE_RESOURCE | CS_CFG_REG_TYPE_VAL_SAVE,
  47                 .offset = TRCCNTVRn(0),
  48                 .hw_info = ETM4_CFG_RES_CTR,
  49         },
  50         {
  51                 .type = CS_CFG_REG_TYPE_RESOURCE | CS_CFG_REG_TYPE_VAL_PARAM,
  52                 .offset = TRCCNTRLDVRn(0),
  53                 .hw_info = ETM4_CFG_RES_CTR,
  54                 .val32 = 0,
  55         },
  56         {
  57                 .type = CS_CFG_REG_TYPE_RESOURCE,
  58                 .offset = TRCCNTCTLRn(0),
  59                 .hw_info = ETM4_CFG_RES_CTR,
  60                 .val32 = 0x10001,
  61         },
  62         /* strobe period counter 1 - reload from param 1 */
  63         {
  64                 .type = CS_CFG_REG_TYPE_RESOURCE | CS_CFG_REG_TYPE_VAL_SAVE,
  65                 .offset = TRCCNTVRn(1),
  66                 .hw_info = ETM4_CFG_RES_CTR,
  67         },
  68         {
  69                 .type = CS_CFG_REG_TYPE_RESOURCE | CS_CFG_REG_TYPE_VAL_PARAM,
  70                 .offset = TRCCNTRLDVRn(1),
  71                 .hw_info = ETM4_CFG_RES_CTR,
  72                 .val32 = 1,
  73         },
  74         {
  75                 .type = CS_CFG_REG_TYPE_RESOURCE,
  76                 .offset = TRCCNTCTLRn(1),
  77                 .hw_info = ETM4_CFG_RES_CTR,
  78                 .val32 = 0x8102,
  79         },
  80         /* sequencer */
  81         {
  82                 .type = CS_CFG_REG_TYPE_RESOURCE,
  83                 .offset = TRCSEQEVRn(0),
  84                 .hw_info = ETM4_CFG_RES_SEQ,
  85                 .val32 = 0x0081,
  86         },
  87         {
  88                 .type = CS_CFG_REG_TYPE_RESOURCE,
  89                 .offset = TRCSEQEVRn(1),
  90                 .hw_info = ETM4_CFG_RES_SEQ,
  91                 .val32 = 0x0000,
  92         },
  93         /* view-inst */
  94         {
  95                 .type = CS_CFG_REG_TYPE_STD | CS_CFG_REG_TYPE_VAL_MASK,
  96                 .offset = TRCVICTLR,
  97                 .val32 = 0x0003,
  98                 .mask32 = 0x0003,
  99         },
 100         /* end of regs */
 101 };
 102
 103 struct cscfg_feature_desc strobe_etm4x = {
 104         .name = "strobing",
 105         .description = "Generate periodic trace capture windows.\n"
 106                        "parameter \'window\': a number of CPU cycles (W)\n"
 107                        "parameter \'period\': trace enabled for W cycles every period x W cycles\n",
 108         .match_flags = CS_CFG_MATCH_CLASS_SRC_ETM4,
 109         .nr_params = ARRAY_SIZE(strobe_params),
 110         .params_desc = strobe_params,
 111         .nr_regs = ARRAY_SIZE(strobe_regs),
 112         .regs_desc = strobe_regs,
 113 };
 114
 115 /* create an autofdo configuration */
 116
 117 /* we will provide 9 sets of preset parameter values */
 118 #define AFDO_NR_PRESETS 9
 119 /* the total number of parameters in used features */
 120 #define AFDO_NR_PARAMS  ARRAY_SIZE(strobe_params)
 121
 122 static const char *afdo_ref_names[] = {
 123         "strobing",
 124 };
 125
 126 /*
 127  * set of presets leaves strobing window constant while varying period to allow
 128  * experimentation with mark / space ratios for various workloads
 129  */
 130 static u64 afdo_presets[AFDO_NR_PRESETS][AFDO_NR_PARAMS] = {
 131         { 5000, 2 },
 132         { 5000, 4 },
 133         { 5000, 8 },
 134         { 5000, 16 },
 135         { 5000, 64 },
 136         { 5000, 128 },
 137         { 5000, 512 },
 138         { 5000, 1024 },
 139         { 5000, 4096 },
 140 };
 141
 142 struct cscfg_config_desc afdo_etm4x = {
 143         .name = "autofdo",
 144         .description = "Setup ETMs with strobing for autofdo\n"
 145         "Supplied presets allow experimentation with mark-space ratio for various loads\n",
 146         .nr_feat_refs = ARRAY_SIZE(afdo_ref_names),
 147         .feat_ref_names = afdo_ref_names,
 148         .nr_presets = AFDO_NR_PRESETS,
 149         .nr_total_params = AFDO_NR_PARAMS,
 150         .presets = &afdo_presets[0][0],
 151 };
 152
 153 /* end of ETM4x configurations */
 154 #endif  /* IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X) */