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bcb543cc3d
If SCT is supported but SCT data tables are not, the driver unnecessarily
tries to fall back to SMART. Use SCT without data tables instead in this
situation.
Fixes: 5b46903d8b
("hwmon: Driver for disk and solid state drives with temperature sensors")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
581 lines
16 KiB
C
581 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Hwmon client for disk and solid state drives with temperature sensors
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* Copyright (C) 2019 Zodiac Inflight Innovations
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*
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* With input from:
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* Hwmon client for S.M.A.R.T. hard disk drives with temperature sensors.
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* (C) 2018 Linus Walleij
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*
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* hwmon: Driver for SCSI/ATA temperature sensors
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* by Constantin Baranov <const@mimas.ru>, submitted September 2009
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*
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* This drive supports reporting the temperatire of SATA drives. It can be
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* easily extended to report the temperature of SCSI drives.
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*
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* The primary means to read drive temperatures and temperature limits
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* for ATA drives is the SCT Command Transport feature set as specified in
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* ATA8-ACS.
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* It can be used to read the current drive temperature, temperature limits,
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* and historic minimum and maximum temperatures. The SCT Command Transport
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* feature set is documented in "AT Attachment 8 - ATA/ATAPI Command Set
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* (ATA8-ACS)".
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*
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* If the SCT Command Transport feature set is not available, drive temperatures
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* may be readable through SMART attributes. Since SMART attributes are not well
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* defined, this method is only used as fallback mechanism.
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*
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* There are three SMART attributes which may report drive temperatures.
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* Those are defined as follows (from
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* http://www.cropel.com/library/smart-attribute-list.aspx).
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*
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* 190 Temperature Temperature, monitored by a sensor somewhere inside
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* the drive. Raw value typicaly holds the actual
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* temperature (hexadecimal) in its rightmost two digits.
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*
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* 194 Temperature Temperature, monitored by a sensor somewhere inside
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* the drive. Raw value typicaly holds the actual
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* temperature (hexadecimal) in its rightmost two digits.
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*
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* 231 Temperature Temperature, monitored by a sensor somewhere inside
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* the drive. Raw value typicaly holds the actual
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* temperature (hexadecimal) in its rightmost two digits.
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*
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* Wikipedia defines attributes a bit differently.
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*
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* 190 Temperature Value is equal to (100-temp. °C), allowing manufacturer
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* Difference or to set a minimum threshold which corresponds to a
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* Airflow maximum temperature. This also follows the convention of
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* Temperature 100 being a best-case value and lower values being
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* undesirable. However, some older drives may instead
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* report raw Temperature (identical to 0xC2) or
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* Temperature minus 50 here.
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* 194 Temperature or Indicates the device temperature, if the appropriate
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* Temperature sensor is fitted. Lowest byte of the raw value contains
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* Celsius the exact temperature value (Celsius degrees).
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* 231 Life Left Indicates the approximate SSD life left, in terms of
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* (SSDs) or program/erase cycles or available reserved blocks.
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* Temperature A normalized value of 100 represents a new drive, with
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* a threshold value at 10 indicating a need for
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* replacement. A value of 0 may mean that the drive is
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* operating in read-only mode to allow data recovery.
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* Previously (pre-2010) occasionally used for Drive
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* Temperature (more typically reported at 0xC2).
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*
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* Common denominator is that the first raw byte reports the temperature
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* in degrees C on almost all drives. Some drives may report a fractional
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* temperature in the second raw byte.
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*
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* Known exceptions (from libatasmart):
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* - SAMSUNG SV0412H and SAMSUNG SV1204H) report the temperature in 10th
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* degrees C in the first two raw bytes.
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* - A few Maxtor drives report an unknown or bad value in attribute 194.
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* - Certain Apple SSD drives report an unknown value in attribute 190.
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* Only certain firmware versions are affected.
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*
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* Those exceptions affect older ATA drives and are currently ignored.
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* Also, the second raw byte (possibly reporting the fractional temperature)
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* is currently ignored.
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*
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* Many drives also report temperature limits in additional SMART data raw
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* bytes. The format of those is not well defined and varies widely.
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* The driver does not currently attempt to report those limits.
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*
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* According to data in smartmontools, attribute 231 is rarely used to report
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* drive temperatures. At the same time, several drives report SSD life left
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* in attribute 231, but do not support temperature sensors. For this reason,
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* attribute 231 is currently ignored.
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*
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* Following above definitions, temperatures are reported as follows.
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* If SCT Command Transport is supported, it is used to read the
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* temperature and, if available, temperature limits.
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* - Otherwise, if SMART attribute 194 is supported, it is used to read
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* the temperature.
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* - Otherwise, if SMART attribute 190 is supported, it is used to read
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* the temperature.
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*/
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#include <linux/ata.h>
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#include <linux/bits.h>
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#include <linux/device.h>
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#include <linux/hwmon.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_proto.h>
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struct drivetemp_data {
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struct list_head list; /* list of instantiated devices */
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struct mutex lock; /* protect data buffer accesses */
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struct scsi_device *sdev; /* SCSI device */
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struct device *dev; /* instantiating device */
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struct device *hwdev; /* hardware monitoring device */
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u8 smartdata[ATA_SECT_SIZE]; /* local buffer */
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int (*get_temp)(struct drivetemp_data *st, u32 attr, long *val);
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bool have_temp_lowest; /* lowest temp in SCT status */
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bool have_temp_highest; /* highest temp in SCT status */
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bool have_temp_min; /* have min temp */
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bool have_temp_max; /* have max temp */
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bool have_temp_lcrit; /* have lower critical limit */
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bool have_temp_crit; /* have critical limit */
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int temp_min; /* min temp */
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int temp_max; /* max temp */
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int temp_lcrit; /* lower critical limit */
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int temp_crit; /* critical limit */
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};
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static LIST_HEAD(drivetemp_devlist);
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#define ATA_MAX_SMART_ATTRS 30
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#define SMART_TEMP_PROP_190 190
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#define SMART_TEMP_PROP_194 194
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#define SCT_STATUS_REQ_ADDR 0xe0
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#define SCT_STATUS_VERSION_LOW 0 /* log byte offsets */
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#define SCT_STATUS_VERSION_HIGH 1
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#define SCT_STATUS_TEMP 200
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#define SCT_STATUS_TEMP_LOWEST 201
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#define SCT_STATUS_TEMP_HIGHEST 202
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#define SCT_READ_LOG_ADDR 0xe1
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#define SMART_READ_LOG 0xd5
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#define SMART_WRITE_LOG 0xd6
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#define INVALID_TEMP 0x80
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#define temp_is_valid(temp) ((temp) != INVALID_TEMP)
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#define temp_from_sct(temp) (((s8)(temp)) * 1000)
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static inline bool ata_id_smart_supported(u16 *id)
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{
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return id[ATA_ID_COMMAND_SET_1] & BIT(0);
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}
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static inline bool ata_id_smart_enabled(u16 *id)
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{
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return id[ATA_ID_CFS_ENABLE_1] & BIT(0);
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}
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static int drivetemp_scsi_command(struct drivetemp_data *st,
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u8 ata_command, u8 feature,
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u8 lba_low, u8 lba_mid, u8 lba_high)
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{
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u8 scsi_cmd[MAX_COMMAND_SIZE];
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int data_dir;
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memset(scsi_cmd, 0, sizeof(scsi_cmd));
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scsi_cmd[0] = ATA_16;
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if (ata_command == ATA_CMD_SMART && feature == SMART_WRITE_LOG) {
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scsi_cmd[1] = (5 << 1); /* PIO Data-out */
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/*
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* No off.line or cc, write to dev, block count in sector count
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* field.
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*/
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scsi_cmd[2] = 0x06;
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data_dir = DMA_TO_DEVICE;
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} else {
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scsi_cmd[1] = (4 << 1); /* PIO Data-in */
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/*
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* No off.line or cc, read from dev, block count in sector count
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* field.
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*/
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scsi_cmd[2] = 0x0e;
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data_dir = DMA_FROM_DEVICE;
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}
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scsi_cmd[4] = feature;
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scsi_cmd[6] = 1; /* 1 sector */
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scsi_cmd[8] = lba_low;
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scsi_cmd[10] = lba_mid;
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scsi_cmd[12] = lba_high;
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scsi_cmd[14] = ata_command;
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return scsi_execute_req(st->sdev, scsi_cmd, data_dir,
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st->smartdata, ATA_SECT_SIZE, NULL, HZ, 5,
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NULL);
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}
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static int drivetemp_ata_command(struct drivetemp_data *st, u8 feature,
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u8 select)
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{
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return drivetemp_scsi_command(st, ATA_CMD_SMART, feature, select,
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ATA_SMART_LBAM_PASS, ATA_SMART_LBAH_PASS);
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}
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static int drivetemp_get_smarttemp(struct drivetemp_data *st, u32 attr,
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long *temp)
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{
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u8 *buf = st->smartdata;
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bool have_temp = false;
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u8 temp_raw;
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u8 csum;
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int err;
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int i;
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err = drivetemp_ata_command(st, ATA_SMART_READ_VALUES, 0);
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if (err)
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return err;
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/* Checksum the read value table */
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csum = 0;
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for (i = 0; i < ATA_SECT_SIZE; i++)
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csum += buf[i];
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if (csum) {
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dev_dbg(&st->sdev->sdev_gendev,
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"checksum error reading SMART values\n");
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return -EIO;
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}
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for (i = 0; i < ATA_MAX_SMART_ATTRS; i++) {
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u8 *attr = buf + i * 12;
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int id = attr[2];
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if (!id)
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continue;
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if (id == SMART_TEMP_PROP_190) {
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temp_raw = attr[7];
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have_temp = true;
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}
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if (id == SMART_TEMP_PROP_194) {
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temp_raw = attr[7];
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have_temp = true;
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break;
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}
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}
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if (have_temp) {
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*temp = temp_raw * 1000;
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return 0;
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}
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return -ENXIO;
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}
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static int drivetemp_get_scttemp(struct drivetemp_data *st, u32 attr, long *val)
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{
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u8 *buf = st->smartdata;
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int err;
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err = drivetemp_ata_command(st, SMART_READ_LOG, SCT_STATUS_REQ_ADDR);
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if (err)
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return err;
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switch (attr) {
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case hwmon_temp_input:
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if (!temp_is_valid(buf[SCT_STATUS_TEMP]))
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return -ENODATA;
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*val = temp_from_sct(buf[SCT_STATUS_TEMP]);
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break;
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case hwmon_temp_lowest:
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if (!temp_is_valid(buf[SCT_STATUS_TEMP_LOWEST]))
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return -ENODATA;
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*val = temp_from_sct(buf[SCT_STATUS_TEMP_LOWEST]);
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break;
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case hwmon_temp_highest:
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if (!temp_is_valid(buf[SCT_STATUS_TEMP_HIGHEST]))
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return -ENODATA;
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*val = temp_from_sct(buf[SCT_STATUS_TEMP_HIGHEST]);
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break;
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default:
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err = -EINVAL;
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break;
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}
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return err;
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}
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static int drivetemp_identify_sata(struct drivetemp_data *st)
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{
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struct scsi_device *sdev = st->sdev;
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u8 *buf = st->smartdata;
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struct scsi_vpd *vpd;
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bool is_ata, is_sata;
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bool have_sct_data_table;
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bool have_sct_temp;
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bool have_smart;
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bool have_sct;
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u16 *ata_id;
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u16 version;
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long temp;
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int err;
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/* SCSI-ATA Translation present? */
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rcu_read_lock();
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vpd = rcu_dereference(sdev->vpd_pg89);
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/*
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* Verify that ATA IDENTIFY DEVICE data is included in ATA Information
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* VPD and that the drive implements the SATA protocol.
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*/
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if (!vpd || vpd->len < 572 || vpd->data[56] != ATA_CMD_ID_ATA ||
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vpd->data[36] != 0x34) {
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rcu_read_unlock();
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return -ENODEV;
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}
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ata_id = (u16 *)&vpd->data[60];
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is_ata = ata_id_is_ata(ata_id);
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is_sata = ata_id_is_sata(ata_id);
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have_sct = ata_id_sct_supported(ata_id);
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have_sct_data_table = ata_id_sct_data_tables(ata_id);
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have_smart = ata_id_smart_supported(ata_id) &&
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ata_id_smart_enabled(ata_id);
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rcu_read_unlock();
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/* bail out if this is not a SATA device */
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if (!is_ata || !is_sata)
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return -ENODEV;
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if (!have_sct)
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goto skip_sct;
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err = drivetemp_ata_command(st, SMART_READ_LOG, SCT_STATUS_REQ_ADDR);
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if (err)
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goto skip_sct;
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version = (buf[SCT_STATUS_VERSION_HIGH] << 8) |
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buf[SCT_STATUS_VERSION_LOW];
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if (version != 2 && version != 3)
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goto skip_sct;
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have_sct_temp = temp_is_valid(buf[SCT_STATUS_TEMP]);
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if (!have_sct_temp)
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goto skip_sct;
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st->have_temp_lowest = temp_is_valid(buf[SCT_STATUS_TEMP_LOWEST]);
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st->have_temp_highest = temp_is_valid(buf[SCT_STATUS_TEMP_HIGHEST]);
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if (!have_sct_data_table)
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goto skip_sct_data;
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/* Request and read temperature history table */
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memset(buf, '\0', sizeof(st->smartdata));
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buf[0] = 5; /* data table command */
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buf[2] = 1; /* read table */
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buf[4] = 2; /* temperature history table */
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err = drivetemp_ata_command(st, SMART_WRITE_LOG, SCT_STATUS_REQ_ADDR);
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if (err)
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goto skip_sct_data;
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err = drivetemp_ata_command(st, SMART_READ_LOG, SCT_READ_LOG_ADDR);
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if (err)
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goto skip_sct_data;
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/*
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* Temperature limits per AT Attachment 8 -
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* ATA/ATAPI Command Set (ATA8-ACS)
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*/
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st->have_temp_max = temp_is_valid(buf[6]);
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st->have_temp_crit = temp_is_valid(buf[7]);
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st->have_temp_min = temp_is_valid(buf[8]);
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st->have_temp_lcrit = temp_is_valid(buf[9]);
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st->temp_max = temp_from_sct(buf[6]);
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st->temp_crit = temp_from_sct(buf[7]);
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st->temp_min = temp_from_sct(buf[8]);
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st->temp_lcrit = temp_from_sct(buf[9]);
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skip_sct_data:
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if (have_sct_temp) {
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st->get_temp = drivetemp_get_scttemp;
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return 0;
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}
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skip_sct:
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if (!have_smart)
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return -ENODEV;
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st->get_temp = drivetemp_get_smarttemp;
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return drivetemp_get_smarttemp(st, hwmon_temp_input, &temp);
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}
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static int drivetemp_identify(struct drivetemp_data *st)
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{
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struct scsi_device *sdev = st->sdev;
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/* Bail out immediately if there is no inquiry data */
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if (!sdev->inquiry || sdev->inquiry_len < 16)
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return -ENODEV;
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/* Disk device? */
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if (sdev->type != TYPE_DISK && sdev->type != TYPE_ZBC)
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return -ENODEV;
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return drivetemp_identify_sata(st);
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}
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static int drivetemp_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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struct drivetemp_data *st = dev_get_drvdata(dev);
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int err = 0;
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if (type != hwmon_temp)
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return -EINVAL;
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switch (attr) {
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case hwmon_temp_input:
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case hwmon_temp_lowest:
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case hwmon_temp_highest:
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mutex_lock(&st->lock);
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err = st->get_temp(st, attr, val);
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mutex_unlock(&st->lock);
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break;
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case hwmon_temp_lcrit:
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*val = st->temp_lcrit;
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break;
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case hwmon_temp_min:
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*val = st->temp_min;
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break;
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case hwmon_temp_max:
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*val = st->temp_max;
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break;
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case hwmon_temp_crit:
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*val = st->temp_crit;
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break;
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default:
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err = -EINVAL;
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break;
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}
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return err;
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}
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static umode_t drivetemp_is_visible(const void *data,
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enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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const struct drivetemp_data *st = data;
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switch (type) {
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case hwmon_temp:
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switch (attr) {
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case hwmon_temp_input:
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return 0444;
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case hwmon_temp_lowest:
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if (st->have_temp_lowest)
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return 0444;
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break;
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case hwmon_temp_highest:
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if (st->have_temp_highest)
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return 0444;
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break;
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case hwmon_temp_min:
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if (st->have_temp_min)
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return 0444;
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break;
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case hwmon_temp_max:
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if (st->have_temp_max)
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return 0444;
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break;
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case hwmon_temp_lcrit:
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if (st->have_temp_lcrit)
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return 0444;
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break;
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case hwmon_temp_crit:
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if (st->have_temp_crit)
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return 0444;
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break;
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default:
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break;
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}
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break;
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default:
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break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct hwmon_channel_info *drivetemp_info[] = {
|
|
HWMON_CHANNEL_INFO(chip,
|
|
HWMON_C_REGISTER_TZ),
|
|
HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT |
|
|
HWMON_T_LOWEST | HWMON_T_HIGHEST |
|
|
HWMON_T_MIN | HWMON_T_MAX |
|
|
HWMON_T_LCRIT | HWMON_T_CRIT),
|
|
NULL
|
|
};
|
|
|
|
static const struct hwmon_ops drivetemp_ops = {
|
|
.is_visible = drivetemp_is_visible,
|
|
.read = drivetemp_read,
|
|
};
|
|
|
|
static const struct hwmon_chip_info drivetemp_chip_info = {
|
|
.ops = &drivetemp_ops,
|
|
.info = drivetemp_info,
|
|
};
|
|
|
|
/*
|
|
* The device argument points to sdev->sdev_dev. Its parent is
|
|
* sdev->sdev_gendev, which we can use to get the scsi_device pointer.
|
|
*/
|
|
static int drivetemp_add(struct device *dev, struct class_interface *intf)
|
|
{
|
|
struct scsi_device *sdev = to_scsi_device(dev->parent);
|
|
struct drivetemp_data *st;
|
|
int err;
|
|
|
|
st = kzalloc(sizeof(*st), GFP_KERNEL);
|
|
if (!st)
|
|
return -ENOMEM;
|
|
|
|
st->sdev = sdev;
|
|
st->dev = dev;
|
|
mutex_init(&st->lock);
|
|
|
|
if (drivetemp_identify(st)) {
|
|
err = -ENODEV;
|
|
goto abort;
|
|
}
|
|
|
|
st->hwdev = hwmon_device_register_with_info(dev->parent, "drivetemp",
|
|
st, &drivetemp_chip_info,
|
|
NULL);
|
|
if (IS_ERR(st->hwdev)) {
|
|
err = PTR_ERR(st->hwdev);
|
|
goto abort;
|
|
}
|
|
|
|
list_add(&st->list, &drivetemp_devlist);
|
|
return 0;
|
|
|
|
abort:
|
|
kfree(st);
|
|
return err;
|
|
}
|
|
|
|
static void drivetemp_remove(struct device *dev, struct class_interface *intf)
|
|
{
|
|
struct drivetemp_data *st, *tmp;
|
|
|
|
list_for_each_entry_safe(st, tmp, &drivetemp_devlist, list) {
|
|
if (st->dev == dev) {
|
|
list_del(&st->list);
|
|
hwmon_device_unregister(st->hwdev);
|
|
kfree(st);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct class_interface drivetemp_interface = {
|
|
.add_dev = drivetemp_add,
|
|
.remove_dev = drivetemp_remove,
|
|
};
|
|
|
|
static int __init drivetemp_init(void)
|
|
{
|
|
return scsi_register_interface(&drivetemp_interface);
|
|
}
|
|
|
|
static void __exit drivetemp_exit(void)
|
|
{
|
|
scsi_unregister_interface(&drivetemp_interface);
|
|
}
|
|
|
|
module_init(drivetemp_init);
|
|
module_exit(drivetemp_exit);
|
|
|
|
MODULE_AUTHOR("Guenter Roeck <linus@roeck-us.net>");
|
|
MODULE_DESCRIPTION("Hard drive temperature monitor");
|
|
MODULE_LICENSE("GPL");
|