From patchwork Fri Nov 1 03:56:46 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Guenter Roeck X-Patchwork-Id: 11222321 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4913813BD for ; Fri, 1 Nov 2019 03:56:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 12A6E208CB for ; Fri, 1 Nov 2019 03:56:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Z6/DP9MJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727905AbfKAD4v (ORCPT ); Thu, 31 Oct 2019 23:56:51 -0400 Received: from mail-pf1-f195.google.com ([209.85.210.195]:38933 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726772AbfKAD4v (ORCPT ); Thu, 31 Oct 2019 23:56:51 -0400 Received: by mail-pf1-f195.google.com with SMTP id x28so2868578pfo.6; Thu, 31 Oct 2019 20:56:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=hg3gUNhnCj04JrTkUSlXP5wvJM/+g/HdA4JjcTtjCak=; b=Z6/DP9MJrq8FSb0y1ag7BuQaeRT07SWWXbRifHU9s1rQH4OSx67FYDGBeQ+xShuSpd ArzeSZtTDR+aXAbj9fsynajbIowHcZo0n8LEJWfmtJLCnSAyqbiNpdQjQtO1BFmsFHMH ikFhVbO6HC8KD59i9A+VD6WmbC5OySw26y1YngdS5S5zuY16fth3JzW2mcAFt3NMIZK5 SzqVW74JR/iD08dDm6/2v1yic2PUhhkYxpQz90III0dvTpAOabmy/vg3zHkJwSN1RIrJ jYdh4EfTNDkDykMTFztqxZbF5gFLGUEObbrPMr/iwU01MU5RD7Vtcz34OvE+4MJ9X/gD Ix2A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :mime-version:content-transfer-encoding; bh=hg3gUNhnCj04JrTkUSlXP5wvJM/+g/HdA4JjcTtjCak=; b=ebIMKxNHRCeI6kgCp+mcAV115h0sysAF1D+NPrrKP6ROzlJkglX20hd0QPalq2yWkq 1QdBGcKzXESXcvLXVJWFI/zU9b9u3s1zXDPbkOiriZCX/wIPuhE7EqSTZl//q9RLLgGH KNveror39qJXsnUvu22RRkn0YRdcsDVJLxgXZC4ckKS4+0iUU+zIlg0bTpjHhmtwrcwr dmphd3ZZABVrrShF0OsIlCa+35dF46O5VcAoPozXgRAwBuYx4RYeLufB/NulqWHxT6YW fMAa5+dZUktKVzErEtXxWySMC5d+6WFKQIw5EDHIg9l50WBHknug5NtmhRdU6T62boHa vx1w== X-Gm-Message-State: APjAAAXGTTeYb3k3R9BULLu8RhZaZzqaTan136YKCALKAnRii/ZCaT+K /o9FVvoSpZytUMmPPOFK7sk= X-Google-Smtp-Source: APXvYqwM14FC37lvLIVeiUcrc+0TBOusUiTwECRQDLDIzvYzeQgM1dA7r0vfVAvtIX9yLXBMJSwJ2Q== X-Received: by 2002:a17:90a:26e4:: with SMTP id m91mr2367680pje.92.1572580610035; Thu, 31 Oct 2019 20:56:50 -0700 (PDT) Received: from localhost ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id u68sm4879907pfu.39.2019.10.31.20.56.48 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 31 Oct 2019 20:56:48 -0700 (PDT) From: Guenter Roeck To: Keith Busch Cc: Chris Healy , Jens Axboe , Christoph Hellwig , Sagi Grimberg , linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, Akinobu Mita , linux-pm@vger.kernel.org, Guenter Roeck Subject: [PATCH v3] nvme: Add hardware monitoring support Date: Thu, 31 Oct 2019 20:56:46 -0700 Message-Id: <20191101035646.25644-1-linux@roeck-us.net> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org 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 be able 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 Signed-off-by: Guenter Roeck --- v3: NVME -> NVMe Call nvme_hwmon_init() only once, when the controller is first identified Protect call to nvme_get_log() and reading the log with mutex Convert error return from nvme_get_log() to Linux error code in nvme_hwmon_get_smart_log() Don't read smart log for reporting warning and critical limits Use get_unaligned_le16() instead of le16_to_cpup() to read the composite temperature Use #ifdef CONFIG_NVME_HWMON instead of IS_ENABLED(CONFIG_NVME_HWMON) -EPROTO -> -EIO for generic NVMe level errors Tab-align '=' in data structure initializations v2: Use devm_kfree() to release memory in error path Tested with the following NVMe drives: Intel SSDPEKKW512G7 500GB Samsung SSD 960 EVO 500GB Samsung SSD 970 EVO 500GB Samsung SSD 970 EVO 1TB drivers/nvme/host/Kconfig | 10 ++ drivers/nvme/host/Makefile | 1 + drivers/nvme/host/core.c | 6 ++ drivers/nvme/host/nvme-hwmon.c | 181 +++++++++++++++++++++++++++++++++ drivers/nvme/host/nvme.h | 8 ++ 5 files changed, 206 insertions(+) create mode 100644 drivers/nvme/host/nvme-hwmon.c diff --git a/drivers/nvme/host/Kconfig b/drivers/nvme/host/Kconfig index 2b36f052bfb9..c6439638a419 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..d039e392de36 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) @@ -2895,6 +2898,9 @@ int nvme_init_identify(struct nvme_ctrl *ctrl) if (ret < 0) return ret; + if (!ctrl->identified) + nvme_hwmon_init(ctrl); + ctrl->identified = true; return 0; diff --git a/drivers/nvme/host/nvme-hwmon.c b/drivers/nvme/host/nvme-hwmon.c new file mode 100644 index 000000000000..8a86f0363531 --- /dev/null +++ b/drivers/nvme/host/nvme-hwmon.c @@ -0,0 +1,181 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * NVM Express hardware monitoring support + * Copyright (c) 2019, Guenter Roeck + */ + +#include +#include + +#include "nvme.h" + +struct nvme_hwmon_data { + struct nvme_ctrl *ctrl; + struct nvme_smart_log log; + struct mutex read_lock; +}; + +static int nvme_hwmon_get_smart_log(struct nvme_hwmon_data *data) +{ + int ret; + + ret = nvme_get_log(data->ctrl, NVME_NSID_ALL, NVME_LOG_SMART, 0, + &data->log, sizeof(data->log), 0); + + return ret <= 0 ? ret : -EIO; +} + +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 temp; + int err; + + /* + * First handle attributes which don't require us to read + * the smart log. + */ + switch (attr) { + case hwmon_temp_max: + *val = (data->ctrl->wctemp - 273) * 1000; + return 0; + case hwmon_temp_crit: + *val = (data->ctrl->cctemp - 273) * 1000; + return 0; + default: + break; + } + + mutex_lock(&data->read_lock); + err = nvme_hwmon_get_smart_log(data); + if (err) + goto unlock; + + switch (attr) { + case hwmon_temp_input: + if (!channel) + temp = get_unaligned_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; + } +unlock: + mutex_unlock(&data->read_lock); + 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; + mutex_init(&data->read_lock); + + err = nvme_hwmon_get_smart_log(data); + if (err) { + dev_warn(dev, "Failed to read smart log (error %d)\n", err); + devm_kfree(dev, data); + 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"); + devm_kfree(dev, data); + } +} diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 22e8401352c2..cb3b242a214e 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; } +#ifdef 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 */