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Additional functions for other common operations including feature reset. Signed-off-by: Mike Leach --- drivers/hwtracing/coresight/Makefile | 2 +- .../hwtracing/coresight/coresight-config.c | 245 ++++++++++++++++++ .../hwtracing/coresight/coresight-config.h | 14 +- .../hwtracing/coresight/coresight-syscfg.c | 5 +- 4 files changed, 262 insertions(+), 4 deletions(-) create mode 100644 drivers/hwtracing/coresight/coresight-config.c diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index 4ce854c434b1..daad9f103a78 100644 --- a/drivers/hwtracing/coresight/Makefile +++ b/drivers/hwtracing/coresight/Makefile @@ -4,7 +4,7 @@ # obj-$(CONFIG_CORESIGHT) += coresight.o coresight-y := coresight-core.o coresight-etm-perf.o coresight-platform.o \ - coresight-sysfs.o coresight-syscfg.o + coresight-sysfs.o coresight-syscfg.o coresight-config.o obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o coresight-tmc-y := coresight-tmc-core.o coresight-tmc-etf.o \ coresight-tmc-etr.o diff --git a/drivers/hwtracing/coresight/coresight-config.c b/drivers/hwtracing/coresight/coresight-config.c new file mode 100644 index 000000000000..6cc4b213d9b6 --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-config.c @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright(C) 2020 Linaro Limited. All rights reserved. + * Author: Mike Leach + */ + +#include +#include "coresight-config.h" +#include "coresight-priv.h" + +/* + * Write the value held in the register structure into the driver internal memory + * location. + */ +static void cscfg_set_reg(struct cscfg_reg_csdev *reg) +{ + u32 *p_val32 = (u32 *)reg->drv_store; + u32 tmp32 = reg->value.val32; + + if (reg->value.type & CS_CFG_REG_TYPE_VAL_64BIT) { + *((u64 *)reg->drv_store) = reg->value.val64; + return; + } + + if (reg->value.type & CS_CFG_REG_TYPE_VAL_MASK) { + tmp32 = *p_val32; + tmp32 &= ~reg->value.mask32; + tmp32 |= reg->value.val32 & reg->value.mask32; + } + *p_val32 = tmp32; +} + +/* + * Read the driver value into the reg if this is marked as one we want to save. + */ +static void cscfg_save_reg(struct cscfg_reg_csdev *reg) +{ + if (!(reg->value.type & CS_CFG_REG_TYPE_VAL_SAVE)) + return; + if (reg->value.type & CS_CFG_REG_TYPE_VAL_64BIT) + reg->value.val64 = *(u64 *)(reg->drv_store); + else + reg->value.val32 = *(u32 *)(reg->drv_store); +} + +static void cscfg_init_reg_param(struct cscfg_parameter_csdev *param_csdev, + struct cscfg_reg_csdev *reg_csdev) +{ + param_csdev->reg = reg_csdev; + param_csdev->val64 = reg_csdev->value.type & CS_CFG_REG_TYPE_VAL_64BIT; + + if (param_csdev->val64) + param_csdev->reg->value.val64 = param_csdev->current_value; + else + param_csdev->reg->value.val32 = (u32)param_csdev->current_value; +} + +/* set values into the driver locations referenced in cscfg_reg_csdev */ +static int cscfg_set_on_enable(struct cscfg_feature_csdev *feat) +{ + int i; + + spin_lock(feat->csdev_spinlock); + for (i = 0; i < feat->nr_regs; i++) + cscfg_set_reg(&feat->regs[i]); + spin_unlock(feat->csdev_spinlock); + dev_dbg(&feat->csdev->dev, "Feature %s: %s", feat->desc->name, "set on enable"); + return 0; +} + +/* copy back values from the driver locations referenced in cscfg_reg_csdev */ +static void cscfg_save_on_disable(struct cscfg_feature_csdev *feat) +{ + int i; + + spin_lock(feat->csdev_spinlock); + for (i = 0; i < feat->nr_regs; i++) + cscfg_save_reg(&feat->regs[i]); + spin_unlock(feat->csdev_spinlock); + dev_dbg(&feat->csdev->dev, "Feature %s: %s", feat->desc->name, "save on disable"); +} + +/* default reset - restore default values */ +void cscfg_reset_feat(struct cscfg_feature_csdev *feat) +{ + struct cscfg_parameter_csdev *param_csdev; + struct cscfg_regval_desc *reg_desc; + struct cscfg_reg_csdev *reg_csdev; + int i; + + /* + * set the default values for all parameters and regs from the + * relevant static descriptors. + */ + for (i = 0; i < feat->nr_params; i++) + feat->params[i].current_value = feat->desc->params[i].value; + + for (i = 0; i < feat->nr_regs; i++) { + reg_desc = &feat->desc->regs[i]; + reg_csdev = &feat->regs[i]; + reg_csdev->value.type = reg_desc->type; + + /* check if reg set from a parameter otherwise desc default */ + if (reg_desc->type & CS_CFG_REG_TYPE_VAL_PARAM) { + /* for param, reg_desc->val32 is an index */ + param_csdev = &feat->params[reg_desc->val32]; + cscfg_init_reg_param(param_csdev, reg_csdev); + } else + reg_csdev->value.val64 = reg_desc->val64; + } +} + +static int cscfg_update_presets(struct cscfg_config_csdev *cfg, int preset) +{ + int i, j, line_offset = 0, val_idx = 0, max_idx; + struct cscfg_parameter_csdev *param; + struct cscfg_feature_csdev *feat; + const char *name; + u64 val; + + if (preset > cfg->desc->nr_presets) + return -EINVAL; + /* + * Go through the array of features, assigning preset values to + * feature parameters in the order they appear. + * There should be precisely the same number of preset values as the + * sum of number of parameters over all the features - but we will + * ensure there is no overrun. + */ + line_offset = (preset-1) * cfg->desc->nr_total_params; + max_idx = cfg->desc->nr_total_params; + for (i = 0; i < cfg->nr_feat; i++) { + feat = cfg->feats[i]; + if (!feat->nr_params) + continue; + + for (j = 0; j < feat->nr_params; j++) { + param = &feat->params[j]; + name = feat->desc->params[j].name; + val = cfg->desc->presets[line_offset + val_idx++]; + if (param->val64) { + dev_dbg(&cfg->csdev->dev, + "set param %s (%lld)", name, val); + param->reg->value.val64 = val; + } else { + param->reg->value.val32 = (u32)val; + dev_dbg(&cfg->csdev->dev, + "set param %s (%d)", name, (u32)val); + } + if (val_idx >= max_idx) + break; + } + + /* don't overrun the preset array line */ + if (val_idx >= max_idx) + break; + } + return 0; +} + +/* + * if we are not using a preset, then need to update the feature params + * with current values. + */ +static int cscfg_update_curr_params(struct cscfg_config_csdev *cfg) +{ + int i, j; + struct cscfg_feature_csdev *feat; + struct cscfg_parameter_csdev *param; + const char *name; + u64 val; + + for (i = 0; i < cfg->nr_feat; i++) { + feat = cfg->feats[i]; + if (!feat->nr_params) + continue; + for (j = 0; j < feat->nr_params; j++) { + param = &feat->params[j]; + name = feat->desc->params[j].name; + val = param->current_value; + if (param->val64) { + dev_dbg(&cfg->csdev->dev, + "set param %s (%lld)", name, val); + param->reg->value.val64 = val; + } else { + param->reg->value.val32 = (u32)val; + dev_dbg(&cfg->csdev->dev, + "set param %s (%d)", name, (u32)val); + } + } + } + return 0; +} + +static int cscfg_prog_config(struct cscfg_config_csdev *cfg, bool enable) +{ + int i, err = 0; + struct cscfg_feature_csdev *feat; + struct coresight_device *csdev; + + for (i = 0; i < cfg->nr_feat; i++) { + feat = cfg->feats[i]; + csdev = feat->csdev; + dev_dbg(&csdev->dev, "cfg %s; %s feature:%s", cfg->desc->name, + enable ? "enable" : "disable", feat->desc->name); + + if (enable) + err = cscfg_set_on_enable(feat); + else + cscfg_save_on_disable(feat); + + if (err) + break; + } + return err; +} + +/** + * Enable configuration for the device. + * + * @cfg: config_csdev to set. + * @preset: preset values to use - 0 for default. + */ +int cscfg_csdev_enable_config(struct cscfg_config_csdev *cfg, int preset) +{ + int err = 0; + + if (preset) + err = cscfg_update_presets(cfg, preset); + else + err = cscfg_update_curr_params(cfg); + if (!err) + err = cscfg_prog_config(cfg, true); + if (!err) + cfg->enabled = true; + return err; +} + +void cscfg_csdev_disable_config(struct cscfg_config_csdev *cfg) +{ + if (cfg->enabled) { + cscfg_prog_config(cfg, false); + cfg->enabled = false; + } +} diff --git a/drivers/hwtracing/coresight/coresight-config.h b/drivers/hwtracing/coresight/coresight-config.h index 75ecdecf7013..9d66e0071f38 100644 --- a/drivers/hwtracing/coresight/coresight-config.h +++ b/drivers/hwtracing/coresight/coresight-config.h @@ -53,7 +53,10 @@ struct cscfg_parameter_desc { }; /** - * Representation of register value. + * Representation of register value and a descriptor of register usage. + * + * Used as a descriptor in the feature descriptors. + * Used as a value in when in a feature loading into a csdev. * * Supports full 64 bit register value, or 32 bit value with optional mask * value. @@ -262,4 +265,13 @@ struct cscfg_csdev_feat_ops { struct cscfg_feature_csdev *feat); }; +/* coresight config helper functions*/ + +/* enable / disable config on a device - called with appropriate locks set.*/ +int cscfg_csdev_enable_config(struct cscfg_config_csdev *cfg, int preset); +void cscfg_csdev_disable_config(struct cscfg_config_csdev *cfg); + +/* reset a feature to default values */ +void cscfg_reset_feat(struct cscfg_feature_csdev *feat); + #endif /* _CORESIGHT_CORESIGHT_CONFIG_H */ diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c b/drivers/hwtracing/coresight/coresight-syscfg.c index c04cea0c1db2..4b8e4e35e3e7 100644 --- a/drivers/hwtracing/coresight/coresight-syscfg.c +++ b/drivers/hwtracing/coresight/coresight-syscfg.c @@ -198,14 +198,15 @@ static int cscfg_load_feat_csdev(struct coresight_device *csdev, if (!feat_csdev) return -ENOMEM; - /* load the feature into the device - may modify default ops*/ + /* load the feature into the device */ err = ops->load_feat(csdev, feat_csdev); if (err) return err; - /* add to internal csdev feature list */ + /* add to internal csdev feature list & initialise using reset call */ mutex_lock(&cscfg_csdev_mutex); list_add(&feat_csdev->node, &csdev->feature_csdev_list); + cscfg_reset_feat(feat_csdev); mutex_unlock(&cscfg_csdev_mutex); return 0; -- 2.17.1