zhaoxin inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I52DS7 CVE: NA

Add support for the temperature sensor inside CPU. Supported are all known variants of the Zhaoxin processors.

v1: Fix some character encoding mistaken.

Signed-off-by: LeoLiu-oc LeoLiu-oc@zhaoxin.com ---  drivers/hwmon/Kconfig           |   9 +  drivers/hwmon/Makefile          |   1 +  drivers/hwmon/via-cputemp.c     |   1 -  drivers/hwmon/zhaoxin-cputemp.c | 292 ++++++++++++++++++++++++++++++++  4 files changed, 302 insertions(+), 1 deletion(-)  create mode 100644 drivers/hwmon/zhaoxin-cputemp.c

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 0c2b032ee617..c11c3c46898a 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1889,6 +1889,15 @@ config SENSORS_VIA_CPUTEMP        sensor inside your CPU. Supported are all known variants of        the VIA C7 and Nano.

+config SENSORS_ZHAOXIN_CPUTEMP +    tristate "Zhaoxin CPU temperature sensor" +    depends on X86 +    select HWMON_VID +    help +      If you say yes here you get support for the temperature +      sensor inside your CPU. Supported are all known variants of +      the Zhaoxin processors. +  config SENSORS_VIA686A      tristate "VIA686A"      depends on PCI diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 9db2903b61e5..2427687972c9 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -184,6 +184,7 @@ obj-$(CONFIG_SENSORS_TMP421)    += tmp421.o  obj-$(CONFIG_SENSORS_TMP513)    += tmp513.o  obj-$(CONFIG_SENSORS_VEXPRESS)    += vexpress-hwmon.o  obj-$(CONFIG_SENSORS_VIA_CPUTEMP)+= via-cputemp.o +obj-$(CONFIG_SENSORS_ZHAOXIN_CPUTEMP)    += zhaoxin-cputemp.o  obj-$(CONFIG_SENSORS_VIA686A)    += via686a.o  obj-$(CONFIG_SENSORS_VT1211)    += vt1211.o  obj-$(CONFIG_SENSORS_VT8231)    += vt8231.o diff --git a/drivers/hwmon/via-cputemp.c b/drivers/hwmon/via-cputemp.c index e5d18dac8ee7..0a5057dbe51a 100644 --- a/drivers/hwmon/via-cputemp.c +++ b/drivers/hwmon/via-cputemp.c @@ -273,7 +273,6 @@ static const struct x86_cpu_id __initconst cputemp_ids[] = {      X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_C7_A,    NULL),      X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_C7_D,    NULL),      X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_NANO,    NULL), -    X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 7, X86_MODEL_ANY, NULL),      {}  };  MODULE_DEVICE_TABLE(x86cpu, cputemp_ids); diff --git a/drivers/hwmon/zhaoxin-cputemp.c b/drivers/hwmon/zhaoxin-cputemp.c new file mode 100644 index 000000000000..dcedb51515f0 --- /dev/null +++ b/drivers/hwmon/zhaoxin-cputemp.c @@ -0,0 +1,292 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * zhaoxin-cputemp.c - Driver for Zhaoxin CPU core temperature monitoring + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/hwmon.h> +#include <linux/hwmon-vid.h> +#include <linux/sysfs.h> +#include <linux/hwmon-sysfs.h> +#include <linux/err.h> +#include <linux/mutex.h> +#include <linux/list.h> +#include <linux/platform_device.h> +#include <linux/cpu.h> +#include <asm/msr.h> +#include <asm/processor.h> +#include <asm/cpu_device_id.h> + +#define DRVNAME    "zhaoxin_cputemp" + +enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME }; + +/* Functions declaration */ + +struct zhaoxin_cputemp_data { +    struct device *hwmon_dev; +    const char *name; +    u8 vrm; +    u32 id; +    u32 msr_temp; +    u32 msr_vid; +}; + +/* Sysfs stuff */ + +static ssize_t name_show(struct device *dev, struct device_attribute *devattr, +             char *buf) +{ +    int ret; +    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); +    struct zhaoxin_cputemp_data *data = dev_get_drvdata(dev); + +    if (attr->index == SHOW_NAME) +        ret = sprintf(buf, "%s\n", data->name); +    else    /* show label */ +        ret = sprintf(buf, "Core %d\n", data->id); +    return ret; +} + +static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, char *buf) +{ +    struct zhaoxin_cputemp_data *data = dev_get_drvdata(dev); +    u32 eax, edx; +    int err; + +    err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); +    if (err) +        return -EAGAIN; + +    return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000); +} + +static ssize_t cpu0_vid_show(struct device *dev, struct device_attribute *devattr, char *buf) +{ +    struct zhaoxin_cputemp_data *data = dev_get_drvdata(dev); +    u32 eax, edx; +    int err; + +    err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx); +    if (err) +        return -EAGAIN; + +    return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm)); +} + +static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, SHOW_TEMP); +static SENSOR_DEVICE_ATTR_RO(temp1_label, name, SHOW_LABEL); +static SENSOR_DEVICE_ATTR_RO(name, name, SHOW_NAME); + +static struct attribute *zhaoxin_cputemp_attributes[] = { +    &sensor_dev_attr_name.dev_attr.attr, +    &sensor_dev_attr_temp1_label.dev_attr.attr, +    &sensor_dev_attr_temp1_input.dev_attr.attr, +    NULL +}; + +static const struct attribute_group zhaoxin_cputemp_group = { +    .attrs = zhaoxin_cputemp_attributes, +}; + +/* Optional attributes */ +static DEVICE_ATTR_RO(cpu0_vid); + +static int zhaoxin_cputemp_probe(struct platform_device *pdev) +{ +    struct zhaoxin_cputemp_data *data; +    int err; +    u32 eax, edx; + +    data = devm_kzalloc(&pdev->dev, sizeof(struct zhaoxin_cputemp_data), GFP_KERNEL); +    if (!data) +        return -ENOMEM; + +    data->id = pdev->id; +    data->name = "zhaoxin_cputemp"; +    data->msr_temp = 0x1423; + +    /* test if we can access the TEMPERATURE MSR */ +    err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); +    if (err) { +        dev_err(&pdev->dev, "Unable to access TEMPERATURE MSR, giving up\n"); +        return err; +    } + +    platform_set_drvdata(pdev, data); + +    err = sysfs_create_group(&pdev->dev.kobj, &zhaoxin_cputemp_group); +    if (err) +        return err; + +    if (data->msr_vid) +        data->vrm = vid_which_vrm(); + +    if (data->vrm) { +        err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid); +        if (err) +            goto exit_remove; +    } + +    data->hwmon_dev = hwmon_device_register(&pdev->dev); +    if (IS_ERR(data->hwmon_dev)) { +        err = PTR_ERR(data->hwmon_dev); +        dev_err(&pdev->dev, "Class registration failed (%d)\n", err); +        goto exit_remove; +    } + +    return 0; + +exit_remove: +    if (data->vrm) +        device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); +    sysfs_remove_group(&pdev->dev.kobj, &zhaoxin_cputemp_group); +    return err; +} + +static int zhaoxin_cputemp_remove(struct platform_device *pdev) +{ +    struct zhaoxin_cputemp_data *data = platform_get_drvdata(pdev); + +    hwmon_device_unregister(data->hwmon_dev); +    if (data->vrm) +        device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); +    sysfs_remove_group(&pdev->dev.kobj, &zhaoxin_cputemp_group); +    return 0; +} + +static struct platform_driver zhaoxin_cputemp_driver = { +    .driver = { +        .name = DRVNAME, +    }, +    .probe = zhaoxin_cputemp_probe, +    .remove = zhaoxin_cputemp_remove, +}; + +struct pdev_entry { +    struct list_head list; +    struct platform_device *pdev; +    unsigned int cpu; +}; + +static LIST_HEAD(pdev_list); +static DEFINE_MUTEX(pdev_list_mutex); + +static int zhaoxin_cputemp_online(unsigned int cpu) +{ +    int err; +    struct platform_device *pdev; +    struct pdev_entry *pdev_entry; + +    pdev = platform_device_alloc(DRVNAME, cpu); +    if (!pdev) { +        err = -ENOMEM; +        pr_err("Device allocation failed\n"); +        goto exit; +    } + +    pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); +    if (!pdev_entry) { +        err = -ENOMEM; +        goto exit_device_put; +    } + +    err = platform_device_add(pdev); +    if (err) { +        pr_err("Device addition failed (%d)\n", err); +        goto exit_device_free; +    } + +    pdev_entry->pdev = pdev; +    pdev_entry->cpu = cpu; +    mutex_lock(&pdev_list_mutex); +    list_add_tail(&pdev_entry->list, &pdev_list); +    mutex_unlock(&pdev_list_mutex); + +    return 0; + +exit_device_free: +    kfree(pdev_entry); +exit_device_put: +    platform_device_put(pdev); +exit: +    return err; +} + +static int zhaoxin_cputemp_down_prep(unsigned int cpu) +{ +    struct pdev_entry *p; + +    mutex_lock(&pdev_list_mutex); +    list_for_each_entry(p, &pdev_list, list) { +        if (p->cpu == cpu) { +            platform_device_unregister(p->pdev); +            list_del(&p->list); +            mutex_unlock(&pdev_list_mutex); +            kfree(p); +            return 0; +        } +    } +    mutex_unlock(&pdev_list_mutex); +    return 0; +} + +static const struct x86_cpu_id __initconst cputemp_ids[] = { +    X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 7, X86_MODEL_ANY, NULL), +    X86_MATCH_VENDOR_FAM_MODEL(ZHAOXIN, 7, X86_MODEL_ANY, NULL), +    {} +}; +MODULE_DEVICE_TABLE(x86cpu, cputemp_ids); + +static enum cpuhp_state zhaoxin_temp_online; + +static int __init zhaoxin_cputemp_init(void) +{ +    int err; + +    if (!x86_match_cpu(cputemp_ids)) +        return -ENODEV; + +    err = platform_driver_register(&zhaoxin_cputemp_driver); +    if (err) +        goto exit; + +    err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/zhaoxin:online", +                zhaoxin_cputemp_online, zhaoxin_cputemp_down_prep); +    if (err < 0) +        goto exit_driver_unreg; +    zhaoxin_temp_online = err; + +#ifndef CONFIG_HOTPLUG_CPU +    if (list_empty(&pdev_list)) { +        err = -ENODEV; +        goto exit_hp_unreg; +    } +#endif +    return 0; + +#ifndef CONFIG_HOTPLUG_CPU +exit_hp_unreg: +    cpuhp_remove_state_nocalls(zhaoxin_temp_online); +#endif +exit_driver_unreg: +    platform_driver_unregister(&zhaoxin_cputemp_driver); +exit: +    return err; +} + +static void __exit zhaoxin_cputemp_exit(void) +{ +    cpuhp_remove_state(zhaoxin_temp_online); +    platform_driver_unregister(&zhaoxin_cputemp_driver); +} + +MODULE_DESCRIPTION("Zhaoxin CPU temperature monitor"); +MODULE_LICENSE("GPL"); + +module_init(zhaoxin_cputemp_init) +module_exit(zhaoxin_cputemp_exit)