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Date:   Fri, 1 Jun 2018 11:54:22 -0700
From:   Guenter Roeck <linux@roeck-us.net>
To:     Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
Cc:     Jean Delvare <jdelvare@suse.com>,
        Jason M Biils <jason.m.bills@linux.intel.com>,
        linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org,
        openbmc@lists.ozlabs.org, Alan Cox <alan@linux.intel.com>,
        Andrew Jeffery <andrew@aj.id.au>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Arnd Bergmann <arnd@arndb.de>, Joel Stanley <joel@jms.id.au>,
        Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Stef van Os <stef.van.os@prodrive-technologies.com>
Subject: Re: [PATCH linux-next v5 11/13] drivers/hwmon: Add PECI cputemp
 driver
Message-ID: <20180601185422.GB27795@roeck-us.net>
References: <20180601182254.24072-1-jae.hyun.yoo@linux.intel.com>
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On Fri, Jun 01, 2018 at 11:22:54AM -0700, Jae Hyun Yoo wrote:
> This commit adds PECI cputemp hwmon driver.
> 
> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
> Reviewed-by: Haiyue Wang <haiyue.wang@linux.intel.com>
> Reviewed-by: James Feist <james.feist@linux.intel.com>
> Reviewed-by: Vernon Mauery <vernon.mauery@linux.intel.com>
> Cc: Alan Cox <alan@linux.intel.com>
> Cc: Andrew Jeffery <andrew@aj.id.au>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Jason M Biils <jason.m.bills@linux.intel.com>
> Cc: Joel Stanley <joel@jms.id.au>
> Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
> Cc: Andrew Lunn <andrew@lunn.ch>
> Cc: Stef van Os <stef.van.os@prodrive-technologies.com>

Acked-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  drivers/hwmon/Kconfig        |  14 ++
>  drivers/hwmon/Makefile       |   1 +
>  drivers/hwmon/peci-cputemp.c | 401 +++++++++++++++++++++++++++++++++++
>  3 files changed, 416 insertions(+)
>  create mode 100644 drivers/hwmon/peci-cputemp.c
> 
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index f10840ad465c..e5d2d0b44c14 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1256,6 +1256,20 @@ config SENSORS_NCT7904
>  	  This driver can also be built as a module.  If so, the module
>  	  will be called nct7904.
>  
> +config SENSORS_PECI_CPUTEMP
> +	tristate "PECI CPU temperature monitoring support"
> +	depends on PECI
> +	select MFD_PECI_CLIENT
> +	help
> +	  If you say yes here you get support for the generic Intel PECI
> +	  cputemp driver which provides Digital Thermal Sensor (DTS) thermal
> +	  readings of the CPU package and CPU cores that are accessible using
> +	  the PECI Client Command Suite via the processor PECI client.
> +	  Check Documentation/hwmon/peci-cputemp for details.
> +
> +	  This driver can also be built as a module.  If so, the module
> +	  will be called peci-cputemp.
> +
>  config SENSORS_NSA320
>  	tristate "ZyXEL NSA320 and compatible fan speed and temperature sensors"
>  	depends on GPIOLIB && OF
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index e7d52a36e6c4..3cd603cd66a7 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -136,6 +136,7 @@ obj-$(CONFIG_SENSORS_NCT7802)	+= nct7802.o
>  obj-$(CONFIG_SENSORS_NCT7904)	+= nct7904.o
>  obj-$(CONFIG_SENSORS_NSA320)	+= nsa320-hwmon.o
>  obj-$(CONFIG_SENSORS_NTC_THERMISTOR)	+= ntc_thermistor.o
> +obj-$(CONFIG_SENSORS_PECI_CPUTEMP)	+= peci-cputemp.o
>  obj-$(CONFIG_SENSORS_PC87360)	+= pc87360.o
>  obj-$(CONFIG_SENSORS_PC87427)	+= pc87427.o
>  obj-$(CONFIG_SENSORS_PCF8591)	+= pcf8591.o
> diff --git a/drivers/hwmon/peci-cputemp.c b/drivers/hwmon/peci-cputemp.c
> new file mode 100644
> index 000000000000..167bf6d37831
> --- /dev/null
> +++ b/drivers/hwmon/peci-cputemp.c
> @@ -0,0 +1,401 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2018 Intel Corporation
> +
> +#include <linux/hwmon.h>
> +#include <linux/jiffies.h>
> +#include <linux/mfd/peci-client.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +
> +#define DEFAULT_CHANNEL_NUMS   4
> +#define CORETEMP_CHANNEL_NUMS  CORE_NUMS_MAX
> +#define CPUTEMP_CHANNEL_NUMS   (DEFAULT_CHANNEL_NUMS + CORETEMP_CHANNEL_NUMS)
> +
> +/* The RESOLVED_CORES register in PCU of a client CPU */
> +#define REG_RESOLVED_CORES_BUS      1
> +#define REG_RESOLVED_CORES_DEVICE   30
> +#define REG_RESOLVED_CORES_FUNCTION 3
> +#define REG_RESOLVED_CORES_OFFSET   0xB4
> +
> +struct temp_group {
> +	struct temp_data die;
> +	struct temp_data tcontrol;
> +	struct temp_data tthrottle;
> +	struct temp_data tjmax;
> +	struct temp_data core[CORETEMP_CHANNEL_NUMS];
> +};
> +
> +struct peci_cputemp {
> +	struct peci_mfd *mfd;
> +	struct device *dev;
> +	char name[PECI_NAME_SIZE];
> +	u8 addr;
> +	const struct cpu_gen_info *gen_info;
> +	struct temp_group temp;
> +	u32 core_mask;
> +	u32 temp_config[CPUTEMP_CHANNEL_NUMS + 1];
> +	uint config_idx;
> +	struct hwmon_channel_info temp_info;
> +	const struct hwmon_channel_info *info[2];
> +	struct hwmon_chip_info chip;
> +};
> +
> +enum cputemp_channels {
> +	channel_die,
> +	channel_tcontrol,
> +	channel_tthrottle,
> +	channel_tjmax,
> +	channel_core,
> +};
> +
> +static const u32 config_table[DEFAULT_CHANNEL_NUMS + 1] = {
> +	/* Die temperature */
> +	HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
> +	HWMON_T_CRIT_HYST,
> +
> +	/* Tcontrol temperature */
> +	HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_CRIT,
> +
> +	/* Tthrottle temperature */
> +	HWMON_T_LABEL | HWMON_T_INPUT,
> +
> +	/* Tjmax temperature */
> +	HWMON_T_LABEL | HWMON_T_INPUT,
> +
> +	/* Core temperature - for all core channels */
> +	HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
> +	HWMON_T_CRIT_HYST,
> +};
> +
> +static const char *cputemp_label[CPUTEMP_CHANNEL_NUMS] = {
> +	"Die",
> +	"Tcontrol",
> +	"Tthrottle",
> +	"Tjmax",
> +	"Core 0", "Core 1", "Core 2", "Core 3",
> +	"Core 4", "Core 5", "Core 6", "Core 7",
> +	"Core 8", "Core 9", "Core 10", "Core 11",
> +	"Core 12", "Core 13", "Core 14", "Core 15",
> +	"Core 16", "Core 17", "Core 18", "Core 19",
> +	"Core 20", "Core 21", "Core 22", "Core 23",
> +};
> +
> +static s32 ten_dot_six_to_millidegree(s32 val)
> +{
> +	return ((val ^ 0x8000) - 0x8000) * 1000 / 64;
> +}
> +
> +static int get_temp_targets(struct peci_cputemp *priv)
> +{
> +	s32 tthrottle_offset;
> +	s32 tcontrol_margin;
> +	u8  pkg_cfg[4];
> +	int rc;
> +
> +	/**
> +	 * Just use only the tcontrol marker to determine if target values need
> +	 * update.
> +	 */
> +	if (!peci_temp_need_update(&priv->temp.tcontrol))
> +		return 0;
> +
> +	rc = peci_client_rd_pkg_cfg_cmd(priv->mfd, MBX_INDEX_TEMP_TARGET,
> +					0, pkg_cfg);
> +	if (rc)
> +		return rc;
> +
> +	priv->temp.tjmax.value = pkg_cfg[2] * 1000;
> +
> +	tcontrol_margin = pkg_cfg[1];
> +	tcontrol_margin = ((tcontrol_margin ^ 0x80) - 0x80) * 1000;
> +	priv->temp.tcontrol.value = priv->temp.tjmax.value - tcontrol_margin;
> +
> +	tthrottle_offset = (pkg_cfg[3] & 0x2f) * 1000;
> +	priv->temp.tthrottle.value = priv->temp.tjmax.value - tthrottle_offset;
> +
> +	peci_temp_mark_updated(&priv->temp.tcontrol);
> +
> +	return 0;
> +}
> +
> +static int get_die_temp(struct peci_cputemp *priv)
> +{
> +	struct peci_get_temp_msg msg;
> +	int rc;
> +
> +	if (!peci_temp_need_update(&priv->temp.die))
> +		return 0;
> +
> +	msg.addr = priv->addr;
> +
> +	rc = peci_client_command(priv->mfd, PECI_CMD_GET_TEMP, &msg);
> +	if (rc)
> +		return rc;
> +
> +	/* Note that the tjmax should be available before calling it */
> +	priv->temp.die.value = priv->temp.tjmax.value +
> +			       (msg.temp_raw * 1000 / 64);
> +
> +	peci_temp_mark_updated(&priv->temp.die);
> +
> +	return 0;
> +}
> +
> +static int get_core_temp(struct peci_cputemp *priv, int core_index)
> +{
> +	s32 core_dts_margin;
> +	u8  pkg_cfg[4];
> +	int rc;
> +
> +	if (!peci_temp_need_update(&priv->temp.core[core_index]))
> +		return 0;
> +
> +	rc = peci_client_rd_pkg_cfg_cmd(priv->mfd, MBX_INDEX_PER_CORE_DTS_TEMP,
> +					core_index, pkg_cfg);
> +	if (rc)
> +		return rc;
> +
> +	core_dts_margin = le16_to_cpup((__le16 *)pkg_cfg);
> +
> +	/**
> +	 * Processors return a value of the core DTS reading in 10.6 format
> +	 * (10 bits signed decimal, 6 bits fractional).
> +	 * Error codes:
> +	 *   0x8000: General sensor error
> +	 *   0x8001: Reserved
> +	 *   0x8002: Underflow on reading value
> +	 *   0x8003-0x81ff: Reserved
> +	 */
> +	if (core_dts_margin >= 0x8000 && core_dts_margin <= 0x81ff)
> +		return -EIO;
> +
> +	core_dts_margin = ten_dot_six_to_millidegree(core_dts_margin);
> +
> +	/* Note that the tjmax should be available before calling it */
> +	priv->temp.core[core_index].value = priv->temp.tjmax.value +
> +					    core_dts_margin;
> +
> +	peci_temp_mark_updated(&priv->temp.core[core_index]);
> +
> +	return 0;
> +}
> +
> +static int cputemp_read_string(struct device *dev,
> +			       enum hwmon_sensor_types type,
> +			       u32 attr, int channel, const char **str)
> +{
> +	if (attr != hwmon_temp_label)
> +		return -EOPNOTSUPP;
> +
> +	*str = cputemp_label[channel];
> +	return 0;
> +}
> +
> +static int cputemp_read(struct device *dev,
> +			enum hwmon_sensor_types type,
> +			u32 attr, int channel, long *val)
> +{
> +	struct peci_cputemp *priv = dev_get_drvdata(dev);
> +	int rc, core_index;
> +
> +	if (channel >= CPUTEMP_CHANNEL_NUMS ||
> +	    !(priv->temp_config[channel] & BIT(attr)))
> +		return -EOPNOTSUPP;
> +
> +	rc = get_temp_targets(priv);
> +	if (rc)
> +		return rc;
> +
> +	switch (attr) {
> +	case hwmon_temp_input:
> +		switch (channel) {
> +		case channel_die:
> +			rc = get_die_temp(priv);
> +			if (rc)
> +				break;
> +
> +			*val = priv->temp.die.value;
> +			break;
> +		case channel_tcontrol:
> +			*val = priv->temp.tcontrol.value;
> +			break;
> +		case channel_tthrottle:
> +			*val = priv->temp.tthrottle.value;
> +			break;
> +		case channel_tjmax:
> +			*val = priv->temp.tjmax.value;
> +			break;
> +		default:
> +			core_index = channel - DEFAULT_CHANNEL_NUMS;
> +			rc = get_core_temp(priv, core_index);
> +			if (rc)
> +				break;
> +
> +			*val = priv->temp.core[core_index].value;
> +			break;
> +		}
> +		break;
> +	case hwmon_temp_max:
> +		*val = priv->temp.tcontrol.value;
> +		break;
> +	case hwmon_temp_crit:
> +		*val = priv->temp.tjmax.value;
> +		break;
> +	case hwmon_temp_crit_hyst:
> +		*val = priv->temp.tjmax.value - priv->temp.tcontrol.value;
> +		break;
> +	default:
> +		rc = -EOPNOTSUPP;
> +		break;
> +	}
> +
> +	return rc;
> +}
> +
> +static umode_t cputemp_is_visible(const void *data,
> +				  enum hwmon_sensor_types type,
> +				  u32 attr, int channel)
> +{
> +	const struct peci_cputemp *priv = data;
> +
> +	if (priv->temp_config[channel] & BIT(attr))
> +		if (channel < DEFAULT_CHANNEL_NUMS ||
> +		    (channel >= DEFAULT_CHANNEL_NUMS &&
> +		     (priv->core_mask & BIT(channel - DEFAULT_CHANNEL_NUMS))))
> +			return 0444;
> +
> +	return 0;
> +}
> +
> +static const struct hwmon_ops cputemp_ops = {
> +	.is_visible = cputemp_is_visible,
> +	.read_string = cputemp_read_string,
> +	.read = cputemp_read,
> +};
> +
> +static int check_resolved_cores(struct peci_cputemp *priv)
> +{
> +	struct peci_rd_pci_cfg_local_msg msg;
> +	int rc;
> +
> +	/* Get the RESOLVED_CORES register value */
> +	msg.addr = priv->addr;
> +	msg.bus = REG_RESOLVED_CORES_BUS;
> +	msg.device = REG_RESOLVED_CORES_DEVICE;
> +	msg.function = REG_RESOLVED_CORES_FUNCTION;
> +	msg.reg = REG_RESOLVED_CORES_OFFSET;
> +	msg.rx_len = 4;
> +
> +	rc = peci_client_command(priv->mfd, PECI_CMD_RD_PCI_CFG_LOCAL, &msg);
> +	if (rc)
> +		return rc;
> +
> +	priv->core_mask = le32_to_cpup((__le32 *)msg.pci_config);
> +	if (!priv->core_mask)
> +		return -EAGAIN;
> +
> +	dev_dbg(priv->dev, "Scanned resolved cores: 0x%x\n", priv->core_mask);
> +	return 0;
> +}
> +
> +static int create_core_temp_info(struct peci_cputemp *priv)
> +{
> +	int rc, i;
> +
> +	rc = check_resolved_cores(priv);
> +	if (rc)
> +		return rc;
> +
> +	for (i = 0; i < priv->gen_info->core_max; i++)
> +		if (priv->core_mask & BIT(i))
> +			while (i + DEFAULT_CHANNEL_NUMS >= priv->config_idx)
> +				priv->temp_config[priv->config_idx++] =
> +					config_table[channel_core];
> +
> +	return 0;
> +}
> +
> +static int peci_cputemp_probe(struct platform_device *pdev)
> +{
> +	struct peci_mfd *mfd = dev_get_drvdata(pdev->dev.parent);
> +	struct device *dev = &pdev->dev;
> +	struct peci_cputemp *priv;
> +	struct device *hwmon_dev;
> +	int rc;
> +
> +	if ((mfd->adapter->cmd_mask &
> +	    (BIT(PECI_CMD_GET_TEMP) | BIT(PECI_CMD_RD_PKG_CFG))) !=
> +	    (BIT(PECI_CMD_GET_TEMP) | BIT(PECI_CMD_RD_PKG_CFG)))
> +		return -ENODEV;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	dev_set_drvdata(dev, priv);
> +	priv->mfd = mfd;
> +	priv->dev = dev;
> +	priv->addr = mfd->addr;
> +	priv->gen_info = mfd->gen_info;
> +
> +	snprintf(priv->name, PECI_NAME_SIZE, "peci_cputemp.cpu%d", mfd->cpu_no);
> +
> +	priv->temp_config[priv->config_idx++] = config_table[channel_die];
> +	priv->temp_config[priv->config_idx++] = config_table[channel_tcontrol];
> +	priv->temp_config[priv->config_idx++] = config_table[channel_tthrottle];
> +	priv->temp_config[priv->config_idx++] = config_table[channel_tjmax];
> +
> +	rc = create_core_temp_info(priv);
> +	if (rc)
> +		dev_dbg(dev, "Skipped creating core temp info\n");
> +
> +	priv->chip.ops = &cputemp_ops;
> +	priv->chip.info = priv->info;
> +
> +	priv->info[0] = &priv->temp_info;
> +
> +	priv->temp_info.type = hwmon_temp;
> +	priv->temp_info.config = priv->temp_config;
> +
> +	hwmon_dev = devm_hwmon_device_register_with_info(priv->dev,
> +							 priv->name,
> +							 priv,
> +							 &priv->chip,
> +							 NULL);
> +
> +	if (IS_ERR(hwmon_dev))
> +		return PTR_ERR(hwmon_dev);
> +
> +	dev_dbg(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), priv->name);
> +
> +	return 0;
> +}
> +
> +#if IS_ENABLED(CONFIG_OF)
> +static const struct of_device_id peci_cputemp_of_table[] = {
> +	{ .compatible = "intel,peci-cputemp" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, peci_cputemp_of_table);
> +#endif
> +
> +static const struct platform_device_id peci_cputemp_ids[] = {
> +	{ .name = "peci-cputemp", .driver_data = 0 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(platform, peci_cputemp_ids);
> +
> +static struct platform_driver peci_cputemp_driver = {
> +	.probe    = peci_cputemp_probe,
> +	.id_table = peci_cputemp_ids,
> +	.driver   = {
> +			.name           = "peci-cputemp",
> +			.of_match_table = of_match_ptr(peci_cputemp_of_table),
> +	},
> +};
> +module_platform_driver(peci_cputemp_driver);
> +
> +MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>");
> +MODULE_DESCRIPTION("PECI cputemp driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.17.0
>