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Message-ID: <CAHQ1cqFCraPayphD4WWmGP87adGxxmj2Nyae8imotio0r972rA@mail.gmail.com>
Date: Mon, 28 Oct 2019 11:01:03 -0700
From: Andrey Smirnov <andrew.smirnov@...il.com>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Keith Busch <kbusch@...nel.org>,
Chris Healy <Chris.Healy@....aero>, Jens Axboe <axboe@...com>,
Christoph Hellwig <hch@....de>,
Sagi Grimberg <sagi@...mberg.me>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-nvme@...ts.infradead.org
Subject: Re: [PATCH] nvme: Add hardware monitoring support
On Mon, Oct 28, 2019 at 7:04 AM Guenter Roeck <linux@...ck-us.net> wrote:
>
> nvme devices report temperature information in the controller information
> (for limits) and in the smart log. Currently, the only means to retrieve
> this information is the nvme command line interface, which requires
> super-user privileges.
>
> At the same time, it would be desirable to use NVME temperature information
> for thermal control.
>
> This patch adds support to read NVME temperatures from the kernel using the
> hwmon API and adds temperature zones for NVME drives. The thermal subsystem
> can use this information to set thermal policies, and userspace can access
> it using libsensors and/or the "sensors" command.
>
> Example output from the "sensors" command:
>
> nvme0-pci-0100
> Adapter: PCI adapter
> Composite: +39.0°C (high = +85.0°C, crit = +85.0°C)
> Sensor 1: +39.0°C
> Sensor 2: +41.0°C
>
Tried this on ZII i.MX8MQ Ultra Zest Board with NVMe device attached.
Seems to work as advertised, so:
Tested-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
> drivers/nvme/host/Kconfig | 10 +++
> drivers/nvme/host/Makefile | 1 +
> drivers/nvme/host/core.c | 5 ++
> drivers/nvme/host/nvme-hwmon.c | 160 +++++++++++++++++++++++++++++++++
> drivers/nvme/host/nvme.h | 8 ++
> 5 files changed, 184 insertions(+)
> create mode 100644 drivers/nvme/host/nvme-hwmon.c
>
> diff --git a/drivers/nvme/host/Kconfig b/drivers/nvme/host/Kconfig
> index 2b36f052bfb9..aeb49e16e386 100644
> --- a/drivers/nvme/host/Kconfig
> +++ b/drivers/nvme/host/Kconfig
> @@ -23,6 +23,16 @@ config NVME_MULTIPATH
> /dev/nvmeXnY device will show up for each NVMe namespaces,
> even if it is accessible through multiple controllers.
>
> +config NVME_HWMON
> + bool "NVME hardware monitoring"
> + depends on (NVME_CORE=y && HWMON=y) || (NVME_CORE=m && HWMON)
> + help
> + This provides support for NVME hardware monitoring. If enabled,
> + a hardware monitoring device will be created for each NVME drive
> + in the system.
> +
> + If unsure, say N.
> +
> config NVME_FABRICS
> tristate
>
> diff --git a/drivers/nvme/host/Makefile b/drivers/nvme/host/Makefile
> index 8a4b671c5f0c..03de4797a877 100644
> --- a/drivers/nvme/host/Makefile
> +++ b/drivers/nvme/host/Makefile
> @@ -14,6 +14,7 @@ nvme-core-$(CONFIG_TRACING) += trace.o
> nvme-core-$(CONFIG_NVME_MULTIPATH) += multipath.o
> nvme-core-$(CONFIG_NVM) += lightnvm.o
> nvme-core-$(CONFIG_FAULT_INJECTION_DEBUG_FS) += fault_inject.o
> +nvme-core-$(CONFIG_NVME_HWMON) += nvme-hwmon.o
>
> nvme-y += pci.o
>
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index fa7ba09dca77..fc1d4b146717 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -2796,6 +2796,9 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
> ctrl->oncs = le16_to_cpu(id->oncs);
> ctrl->mtfa = le16_to_cpu(id->mtfa);
> ctrl->oaes = le32_to_cpu(id->oaes);
> + ctrl->wctemp = le16_to_cpu(id->wctemp);
> + ctrl->cctemp = le16_to_cpu(id->cctemp);
> +
> atomic_set(&ctrl->abort_limit, id->acl + 1);
> ctrl->vwc = id->vwc;
> if (id->mdts)
> @@ -2897,6 +2900,8 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
>
> ctrl->identified = true;
>
> + nvme_hwmon_init(ctrl);
> +
> return 0;
>
> out_free:
> diff --git a/drivers/nvme/host/nvme-hwmon.c b/drivers/nvme/host/nvme-hwmon.c
> new file mode 100644
> index 000000000000..f19098bc3228
> --- /dev/null
> +++ b/drivers/nvme/host/nvme-hwmon.c
> @@ -0,0 +1,160 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * NVM Express hardware monitoring support
> + * Copyright (c) 2019, Guenter Roeck
> + */
> +
> +#include <linux/hwmon.h>
> +
> +#include "nvme.h"
> +
> +struct nvme_hwmon_data {
> + struct nvme_ctrl *ctrl;
> + struct nvme_smart_log log;
> +};
> +
> +static int nvme_hwmon_get_smart_log(struct nvme_hwmon_data *data)
> +{
> + return nvme_get_log(data->ctrl, NVME_NSID_ALL, NVME_LOG_SMART, 0,
> + &data->log, sizeof(data->log), 0);
> +}
> +
> +static int nvme_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
> + u32 attr, int channel, long *val)
> +{
> + struct nvme_hwmon_data *data = dev_get_drvdata(dev);
> + struct nvme_smart_log *log = &data->log;
> + int err;
> + int temp;
> +
> + err = nvme_hwmon_get_smart_log(data);
> + if (err)
> + return err < 0 ? err : -EPROTO;
> +
> + switch (attr) {
> + case hwmon_temp_max:
> + *val = (data->ctrl->wctemp - 273) * 1000;
> + break;
> + case hwmon_temp_crit:
> + *val = (data->ctrl->cctemp - 273) * 1000;
> + break;
> + case hwmon_temp_input:
> + if (!channel)
> + temp = le16_to_cpup((__le16 *)log->temperature);
> + else
> + temp = le16_to_cpu(log->temp_sensor[channel - 1]);
> + *val = (temp - 273) * 1000;
> + break;
> + case hwmon_temp_crit_alarm:
> + *val = !!(log->critical_warning & NVME_SMART_CRIT_TEMPERATURE);
> + break;
> + default:
> + err = -EOPNOTSUPP;
> + break;
> + }
> + return err;
> +}
> +
> +static const char * const nvme_hwmon_sensor_names[] = {
> + "Composite",
> + "Sensor 1",
> + "Sensor 2",
> + "Sensor 3",
> + "Sensor 4",
> + "Sensor 5",
> + "Sensor 6",
> + "Sensor 7",
> + "Sensor 8",
> +};
> +
> +static int nvme_hwmon_read_string(struct device *dev,
> + enum hwmon_sensor_types type, u32 attr,
> + int channel, const char **str)
> +{
> + *str = nvme_hwmon_sensor_names[channel];
> + return 0;
> +}
> +
> +static umode_t nvme_hwmon_is_visible(const void *_data,
> + enum hwmon_sensor_types type,
> + u32 attr, int channel)
> +{
> + const struct nvme_hwmon_data *data = _data;
> +
> + switch (attr) {
> + case hwmon_temp_crit:
> + if (!channel && data->ctrl->cctemp)
> + return 0444;
> + break;
> + case hwmon_temp_max:
> + if (!channel && data->ctrl->wctemp)
> + return 0444;
> + break;
> + case hwmon_temp_crit_alarm:
> + if (!channel)
> + return 0444;
> + break;
> + case hwmon_temp_input:
> + case hwmon_temp_label:
> + if (!channel || data->log.temp_sensor[channel - 1])
> + return 0444;
> + break;
> + default:
> + break;
> + }
> + return 0;
> +}
> +
> +static const struct hwmon_channel_info *nvme_hwmon_info[] = {
> + HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
> + HWMON_CHANNEL_INFO(temp,
> + HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
> + HWMON_T_LABEL | HWMON_T_CRIT_ALARM,
> + HWMON_T_INPUT | HWMON_T_LABEL,
> + HWMON_T_INPUT | HWMON_T_LABEL,
> + HWMON_T_INPUT | HWMON_T_LABEL,
> + HWMON_T_INPUT | HWMON_T_LABEL,
> + HWMON_T_INPUT | HWMON_T_LABEL,
> + HWMON_T_INPUT | HWMON_T_LABEL,
> + HWMON_T_INPUT | HWMON_T_LABEL,
> + HWMON_T_INPUT | HWMON_T_LABEL),
> + NULL
> +};
> +
> +static const struct hwmon_ops nvme_hwmon_ops = {
> + .is_visible = nvme_hwmon_is_visible,
> + .read = nvme_hwmon_read,
> + .read_string = nvme_hwmon_read_string,
> +};
> +
> +static const struct hwmon_chip_info nvme_hwmon_chip_info = {
> + .ops = &nvme_hwmon_ops,
> + .info = nvme_hwmon_info,
> +};
> +
> +void nvme_hwmon_init(struct nvme_ctrl *ctrl)
> +{
> + struct device *dev = ctrl->device;
> + struct nvme_hwmon_data *data;
> + struct device *hwmon;
> + int err;
> +
> + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return;
> +
> + data->ctrl = ctrl;
> +
> + err = nvme_hwmon_get_smart_log(data);
> + if (err) {
> + dev_warn(dev, "Failed to read smart log (error %d)\n", err);
> + return;
> + }
> +
> + hwmon = devm_hwmon_device_register_with_info(dev, dev_name(dev),
> + data,
> + &nvme_hwmon_chip_info,
> + NULL);
> + if (IS_ERR(hwmon))
> + dev_warn(dev, "Failed to instantiate hwmon device\n");
> +}
> diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
> index 22e8401352c2..e6460c1216bc 100644
> --- a/drivers/nvme/host/nvme.h
> +++ b/drivers/nvme/host/nvme.h
> @@ -231,6 +231,8 @@ struct nvme_ctrl {
> u16 kas;
> u8 npss;
> u8 apsta;
> + u16 wctemp;
> + u16 cctemp;
> u32 oaes;
> u32 aen_result;
> u32 ctratt;
> @@ -652,4 +654,10 @@ static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
> return dev_to_disk(dev)->private_data;
> }
>
> +#if IS_ENABLED(CONFIG_NVME_HWMON)
> +void nvme_hwmon_init(struct nvme_ctrl *ctrl);
> +#else
> +static inline void nvme_hwmon_init(struct nvme_ctrl *ctrl) { }
> +#endif
> +
> #endif /* _NVME_H */
> --
> 2.17.1
>
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