Release 4.11 drivers/platform/x86/intel_telemetry_core.c
/*
* Intel SoC Core Telemetry Driver
* Copyright (C) 2015, Intel Corporation.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* Telemetry Framework provides platform related PM and performance statistics.
* This file provides the core telemetry API implementation.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <asm/intel_telemetry.h>
#define DRIVER_NAME "intel_telemetry_core"
struct telemetry_core_config {
struct telemetry_plt_config *plt_config;
const struct telemetry_core_ops *telem_ops;
};
static struct telemetry_core_config telm_core_conf;
static int telemetry_def_update_events(struct telemetry_evtconfig pss_evtconfig,
struct telemetry_evtconfig ioss_evtconfig)
{
return 0;
}
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static int telemetry_def_set_sampling_period(u8 pss_period, u8 ioss_period)
{
return 0;
}
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static int telemetry_def_get_sampling_period(u8 *pss_min_period,
u8 *pss_max_period,
u8 *ioss_min_period,
u8 *ioss_max_period)
{
return 0;
}
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static int telemetry_def_get_eventconfig(
struct telemetry_evtconfig *pss_evtconfig,
struct telemetry_evtconfig *ioss_evtconfig,
int pss_len, int ioss_len)
{
return 0;
}
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static int telemetry_def_get_trace_verbosity(enum telemetry_unit telem_unit,
u32 *verbosity)
{
return 0;
}
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static int telemetry_def_set_trace_verbosity(enum telemetry_unit telem_unit,
u32 verbosity)
{
return 0;
}
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static int telemetry_def_raw_read_eventlog(enum telemetry_unit telem_unit,
struct telemetry_evtlog *evtlog,
int len, int log_all_evts)
{
return 0;
}
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static int telemetry_def_read_eventlog(enum telemetry_unit telem_unit,
struct telemetry_evtlog *evtlog,
int len, int log_all_evts)
{
return 0;
}
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static int telemetry_def_add_events(u8 num_pss_evts, u8 num_ioss_evts,
u32 *pss_evtmap, u32 *ioss_evtmap)
{
return 0;
}
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static int telemetry_def_reset_events(void)
{
return 0;
}
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static const struct telemetry_core_ops telm_defpltops = {
.set_sampling_period = telemetry_def_set_sampling_period,
.get_sampling_period = telemetry_def_get_sampling_period,
.get_trace_verbosity = telemetry_def_get_trace_verbosity,
.set_trace_verbosity = telemetry_def_set_trace_verbosity,
.raw_read_eventlog = telemetry_def_raw_read_eventlog,
.get_eventconfig = telemetry_def_get_eventconfig,
.read_eventlog = telemetry_def_read_eventlog,
.update_events = telemetry_def_update_events,
.reset_events = telemetry_def_reset_events,
.add_events = telemetry_def_add_events,
};
/**
* telemetry_update_events() - Update telemetry Configuration
* @pss_evtconfig: PSS related config. No change if num_evts = 0.
* @pss_evtconfig: IOSS related config. No change if num_evts = 0.
*
* This API updates the IOSS & PSS Telemetry configuration. Old config
* is overwritten. Call telemetry_reset_events when logging is over
* All sample period values should be in the form of:
* bits[6:3] -> value; bits [0:2]-> Exponent; Period = (Value *16^Exponent)
*
* Return: 0 success, < 0 for failure
*/
int telemetry_update_events(struct telemetry_evtconfig pss_evtconfig,
struct telemetry_evtconfig ioss_evtconfig)
{
return telm_core_conf.telem_ops->update_events(pss_evtconfig,
ioss_evtconfig);
}
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EXPORT_SYMBOL_GPL(telemetry_update_events);
/**
* telemetry_set_sampling_period() - Sets the IOSS & PSS sampling period
* @pss_period: placeholder for PSS Period to be set.
* Set to 0 if not required to be updated
* @ioss_period: placeholder for IOSS Period to be set
* Set to 0 if not required to be updated
*
* All values should be in the form of:
* bits[6:3] -> value; bits [0:2]-> Exponent; Period = (Value *16^Exponent)
*
* Return: 0 success, < 0 for failure
*/
int telemetry_set_sampling_period(u8 pss_period, u8 ioss_period)
{
return telm_core_conf.telem_ops->set_sampling_period(pss_period,
ioss_period);
}
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EXPORT_SYMBOL_GPL(telemetry_set_sampling_period);
/**
* telemetry_get_sampling_period() - Get IOSS & PSS min & max sampling period
* @pss_min_period: placeholder for PSS Min Period supported
* @pss_max_period: placeholder for PSS Max Period supported
* @ioss_min_period: placeholder for IOSS Min Period supported
* @ioss_max_period: placeholder for IOSS Max Period supported
*
* All values should be in the form of:
* bits[6:3] -> value; bits [0:2]-> Exponent; Period = (Value *16^Exponent)
*
* Return: 0 success, < 0 for failure
*/
int telemetry_get_sampling_period(u8 *pss_min_period, u8 *pss_max_period,
u8 *ioss_min_period, u8 *ioss_max_period)
{
return telm_core_conf.telem_ops->get_sampling_period(pss_min_period,
pss_max_period,
ioss_min_period,
ioss_max_period);
}
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EXPORT_SYMBOL_GPL(telemetry_get_sampling_period);
/**
* telemetry_reset_events() - Restore the IOSS & PSS configuration to default
*
* Return: 0 success, < 0 for failure
*/
int telemetry_reset_events(void)
{
return telm_core_conf.telem_ops->reset_events();
}
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EXPORT_SYMBOL_GPL(telemetry_reset_events);
/**
* telemetry_get_eventconfig() - Returns the pss and ioss events enabled
* @pss_evtconfig: Pointer to PSS related configuration.
* @pss_evtconfig: Pointer to IOSS related configuration.
* @pss_len: Number of u32 elements allocated for pss_evtconfig array
* @ioss_len: Number of u32 elements allocated for ioss_evtconfig array
*
* Return: 0 success, < 0 for failure
*/
int telemetry_get_eventconfig(struct telemetry_evtconfig *pss_evtconfig,
struct telemetry_evtconfig *ioss_evtconfig,
int pss_len, int ioss_len)
{
return telm_core_conf.telem_ops->get_eventconfig(pss_evtconfig,
ioss_evtconfig,
pss_len, ioss_len);
}
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EXPORT_SYMBOL_GPL(telemetry_get_eventconfig);
/**
* telemetry_add_events() - Add IOSS & PSS configuration to existing settings.
* @num_pss_evts: Number of PSS Events (<29) in pss_evtmap. Can be 0.
* @num_ioss_evts: Number of IOSS Events (<29) in ioss_evtmap. Can be 0.
* @pss_evtmap: Array of PSS Event-IDs to Enable
* @ioss_evtmap: Array of PSS Event-IDs to Enable
*
* Events are appended to Old Configuration. In case of total events > 28, it
* returns error. Call telemetry_reset_events to reset after eventlog done
*
* Return: 0 success, < 0 for failure
*/
int telemetry_add_events(u8 num_pss_evts, u8 num_ioss_evts,
u32 *pss_evtmap, u32 *ioss_evtmap)
{
return telm_core_conf.telem_ops->add_events(num_pss_evts,
num_ioss_evts, pss_evtmap,
ioss_evtmap);
}
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EXPORT_SYMBOL_GPL(telemetry_add_events);
/**
* telemetry_read_events() - Fetches samples as specified by evtlog.telem_evt_id
* @telem_unit: Specify whether IOSS or PSS Read
* @evtlog: Array of telemetry_evtlog structs to fill data
* evtlog.telem_evt_id specifies the ids to read
* @len: Length of array of evtlog
*
* Return: number of eventlogs read for success, < 0 for failure
*/
int telemetry_read_events(enum telemetry_unit telem_unit,
struct telemetry_evtlog *evtlog, int len)
{
return telm_core_conf.telem_ops->read_eventlog(telem_unit, evtlog,
len, 0);
}
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EXPORT_SYMBOL_GPL(telemetry_read_events);
/**
* telemetry_raw_read_events() - Fetch samples specified by evtlog.telem_evt_id
* @telem_unit: Specify whether IOSS or PSS Read
* @evtlog: Array of telemetry_evtlog structs to fill data
* evtlog.telem_evt_id specifies the ids to read
* @len: Length of array of evtlog
*
* The caller must take care of locking in this case.
*
* Return: number of eventlogs read for success, < 0 for failure
*/
int telemetry_raw_read_events(enum telemetry_unit telem_unit,
struct telemetry_evtlog *evtlog, int len)
{
return telm_core_conf.telem_ops->raw_read_eventlog(telem_unit, evtlog,
len, 0);
}
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EXPORT_SYMBOL_GPL(telemetry_raw_read_events);
/**
* telemetry_read_eventlog() - Fetch the Telemetry log from PSS or IOSS
* @telem_unit: Specify whether IOSS or PSS Read
* @evtlog: Array of telemetry_evtlog structs to fill data
* @len: Length of array of evtlog
*
* Return: number of eventlogs read for success, < 0 for failure
*/
int telemetry_read_eventlog(enum telemetry_unit telem_unit,
struct telemetry_evtlog *evtlog, int len)
{
return telm_core_conf.telem_ops->read_eventlog(telem_unit, evtlog,
len, 1);
}
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EXPORT_SYMBOL_GPL(telemetry_read_eventlog);
/**
* telemetry_raw_read_eventlog() - Fetch the Telemetry log from PSS or IOSS
* @telem_unit: Specify whether IOSS or PSS Read
* @evtlog: Array of telemetry_evtlog structs to fill data
* @len: Length of array of evtlog
*
* The caller must take care of locking in this case.
*
* Return: number of eventlogs read for success, < 0 for failure
*/
int telemetry_raw_read_eventlog(enum telemetry_unit telem_unit,
struct telemetry_evtlog *evtlog, int len)
{
return telm_core_conf.telem_ops->raw_read_eventlog(telem_unit, evtlog,
len, 1);
}
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EXPORT_SYMBOL_GPL(telemetry_raw_read_eventlog);
/**
* telemetry_get_trace_verbosity() - Get the IOSS & PSS Trace verbosity
* @telem_unit: Specify whether IOSS or PSS Read
* @verbosity: Pointer to return Verbosity
*
* Return: 0 success, < 0 for failure
*/
int telemetry_get_trace_verbosity(enum telemetry_unit telem_unit,
u32 *verbosity)
{
return telm_core_conf.telem_ops->get_trace_verbosity(telem_unit,
verbosity);
}
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EXPORT_SYMBOL_GPL(telemetry_get_trace_verbosity);
/**
* telemetry_set_trace_verbosity() - Update the IOSS & PSS Trace verbosity
* @telem_unit: Specify whether IOSS or PSS Read
* @verbosity: Verbosity to set
*
* Return: 0 success, < 0 for failure
*/
int telemetry_set_trace_verbosity(enum telemetry_unit telem_unit, u32 verbosity)
{
return telm_core_conf.telem_ops->set_trace_verbosity(telem_unit,
verbosity);
}
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EXPORT_SYMBOL_GPL(telemetry_set_trace_verbosity);
/**
* telemetry_set_pltdata() - Set the platform specific Data
* @ops: Pointer to ops structure
* @pltconfig: Platform config data
*
* Usage by other than telemetry pltdrv module is invalid
*
* Return: 0 success, < 0 for failure
*/
int telemetry_set_pltdata(const struct telemetry_core_ops *ops,
struct telemetry_plt_config *pltconfig)
{
if (ops)
telm_core_conf.telem_ops = ops;
if (pltconfig)
telm_core_conf.plt_config = pltconfig;
return 0;
}
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EXPORT_SYMBOL_GPL(telemetry_set_pltdata);
/**
* telemetry_clear_pltdata() - Clear the platform specific Data
*
* Usage by other than telemetry pltdrv module is invalid
*
* Return: 0 success, < 0 for failure
*/
int telemetry_clear_pltdata(void)
{
telm_core_conf.telem_ops = &telm_defpltops;
telm_core_conf.plt_config = NULL;
return 0;
}
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EXPORT_SYMBOL_GPL(telemetry_clear_pltdata);
/**
* telemetry_pltconfig_valid() - Checkif platform config is valid
*
* Usage by other than telemetry module is invalid
*
* Return: 0 success, < 0 for failure
*/
int telemetry_pltconfig_valid(void)
{
if (telm_core_conf.plt_config)
return 0;
else
return -EINVAL;
}
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EXPORT_SYMBOL_GPL(telemetry_pltconfig_valid);
static inline int telemetry_get_pssevtname(enum telemetry_unit telem_unit,
const char **name, int len)
{
struct telemetry_unit_config psscfg;
int i;
if (!telm_core_conf.plt_config)
return -EINVAL;
psscfg = telm_core_conf.plt_config->pss_config;
if (len > psscfg.ssram_evts_used)
len = psscfg.ssram_evts_used;
for (i = 0; i < len; i++)
name[i] = psscfg.telem_evts[i].name;
return 0;
}
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static inline int telemetry_get_iossevtname(enum telemetry_unit telem_unit,
const char **name, int len)
{
struct telemetry_unit_config iosscfg;
int i;
if (!(telm_core_conf.plt_config))
return -EINVAL;
iosscfg = telm_core_conf.plt_config->ioss_config;
if (len > iosscfg.ssram_evts_used)
len = iosscfg.ssram_evts_used;
for (i = 0; i < len; i++)
name[i] = iosscfg.telem_evts[i].name;
return 0;
}
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/**
* telemetry_get_evtname() - Checkif platform config is valid
* @telem_unit: Telemetry Unit to check
* @name: Array of character pointers to contain name
* @len: length of array name provided by user
*
* Usage by other than telemetry debugfs module is invalid
*
* Return: 0 success, < 0 for failure
*/
int telemetry_get_evtname(enum telemetry_unit telem_unit,
const char **name, int len)
{
int ret = -EINVAL;
if (telem_unit == TELEM_PSS)
ret = telemetry_get_pssevtname(telem_unit, name, len);
else if (telem_unit == TELEM_IOSS)
ret = telemetry_get_iossevtname(telem_unit, name, len);
return ret;
}
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EXPORT_SYMBOL_GPL(telemetry_get_evtname);
static int __init telemetry_module_init(void)
{
pr_info(pr_fmt(DRIVER_NAME) " Init\n");
telm_core_conf.telem_ops = &telm_defpltops;
return 0;
}
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static void __exit telemetry_module_exit(void)
{
}
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module_init(telemetry_module_init);
module_exit(telemetry_module_exit);
MODULE_AUTHOR("Souvik Kumar Chakravarty <souvik.k.chakravarty@intel.com>");
MODULE_DESCRIPTION("Intel SoC Telemetry Interface");
MODULE_LICENSE("GPL");
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