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