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Message-ID: <20180601185422.GB27795@roeck-us.net>
Date: Fri, 1 Jun 2018 11:54:22 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
Cc: Jean Delvare <jdelvare@...e.com>,
Jason M Biils <jason.m.bills@...ux.intel.com>,
linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
openbmc@...ts.ozlabs.org, Alan Cox <alan@...ux.intel.com>,
Andrew Jeffery <andrew@...id.au>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Arnd Bergmann <arnd@...db.de>, Joel Stanley <joel@....id.au>,
Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
Andrew Lunn <andrew@...n.ch>,
Stef van Os <stef.van.os@...drive-technologies.com>
Subject: Re: [PATCH linux-next v5 11/13] drivers/hwmon: Add PECI cputemp
driver
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@...ux.intel.com>
> Reviewed-by: Haiyue Wang <haiyue.wang@...ux.intel.com>
> Reviewed-by: James Feist <james.feist@...ux.intel.com>
> Reviewed-by: Vernon Mauery <vernon.mauery@...ux.intel.com>
> Cc: Alan Cox <alan@...ux.intel.com>
> Cc: Andrew Jeffery <andrew@...id.au>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Jason M Biils <jason.m.bills@...ux.intel.com>
> Cc: Joel Stanley <joel@....id.au>
> Cc: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
> Cc: Andrew Lunn <andrew@...n.ch>
> Cc: Stef van Os <stef.van.os@...drive-technologies.com>
Acked-by: Guenter Roeck <linux@...ck-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@...ux.intel.com>");
> +MODULE_DESCRIPTION("PECI cputemp driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.17.0
>
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