| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <d086937b-a6d8-493d-82f6-4f19609e63cb@kernel.org>
Date: Wed, 1 Jan 2025 21:44:26 -0600
From: Mario Limonciello <superm1@...nel.org>
To: "Derek J. Clark" <derekjohn.clark@...il.com>,
Hans de Goede <hdegoede@...hat.com>,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Jonathan Corbet <corbet@....net>, Luke Jones <luke@...nes.dev>,
Xino Ni <nijs1@...ovo.com>, Zhixin Zhang <zhangzx36@...ovo.com>,
Mia Shao <shaohz1@...ovo.com>, Mark Pearson <mpearson-lenovo@...ebb.ca>,
"Pierre-Loup A . Griffais" <pgriffais@...vesoftware.com>,
"Cody T . -H . Chiu" <codyit@...il.com>, John Martens <johnfanv2@...il.com>,
platform-driver-x86@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] platform/x86: Add Lenovo Capability Data 01 WMI
Driver
On 1/1/25 18:47, Derek J. Clark wrote:
> Adds lenovo-wmi-capdata01.c which provides a driver for the
> LENOVO_CAPABILITY_DATA_01 WMI data block that comes on "Other Method"
> enabled hardware. Provides an interface for querying if a given
> attribute is supported by the hardware, as well as its default_value,
> max_value, min_value, and step increment.
>
> v2:
> - Use devm_kzalloc to ensure driver can be instanced, remove global
> reference.
> - Ensure reverse Christmas tree for all variable declarations.
> - Remove extra whitespace.
> - Use guard(mutex) in all mutex instances, global mutex.
> - Use pr_fmt instead of adding the driver name to each pr_err.
> - Remove noisy pr_info usage.
> - Rename capdata_wmi to lenovo_wmi_cd01_priv and cd01_wmi to priv.
> - Use list to get the lenovo_wmi_cd01_priv instance in
> lenovo_wmi_capdata01_get as none of the data provided by the macros
> that will use it can pass a member of the struct for use in
> container_of.
>
> Signed-off-by: Derek J. Clark <derekjohn.clark@...il.com>
> ---
> MAINTAINERS | 1 +
> drivers/platform/x86/Kconfig | 11 ++
> drivers/platform/x86/Makefile | 1 +
> drivers/platform/x86/lenovo-wmi-capdata01.c | 131 ++++++++++++++++++++
> drivers/platform/x86/lenovo-wmi.h | 20 +++
> 5 files changed, 164 insertions(+)
> create mode 100644 drivers/platform/x86/lenovo-wmi-capdata01.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 8f8a6aec6b92..c9374c395905 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -13038,6 +13038,7 @@ LENOVO WMI drivers
> M: Derek J. Clark <derekjohn.clark@...il.com>
> L: platform-driver-x86@...r.kernel.org
> S: Maintained
> +F: drivers/platform/x86/lenovo-wmi-capdata01.c
> F: drivers/platform/x86/lenovo-wmi-gamezone.c
> F: drivers/platform/x86/lenovo-wmi.h
>
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index 9a6ac7fdec9f..a2c1ab47ad9e 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -470,6 +470,17 @@ config LENOVO_WMI_GAMEZONE
> To compile this driver as a module, choose M here: the module will
> be called lenovo_wmi_gamezone.
>
> +config LENOVO_WMI_DATA01
> + tristate "Lenovo Legion WMI capability Data 01 Driver"
> + depends on ACPI_WMI
> + help
> + Say Y here if you have a WMI aware Lenovo Legion device in the "Gaming Series"
> + line of hardware. This interface is a dependency for exposing tunable power
> + settings.
> +
> + To compile this driver as a module, choose M here: the module will
> + be called lenovo_wmi_capdata01.
> +
> config IDEAPAD_LAPTOP
> tristate "Lenovo IdeaPad Laptop Extras"
> depends on ACPI
> diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
> index 7cb29a480ed2..6c96cc3f3855 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -69,6 +69,7 @@ obj-$(CONFIG_YOGABOOK) += lenovo-yogabook.o
> obj-$(CONFIG_YT2_1380) += lenovo-yoga-tab2-pro-1380-fastcharger.o
> obj-$(CONFIG_LENOVO_WMI_CAMERA) += lenovo-wmi-camera.o
> obj-$(CONFIG_LENOVO_WMI_GAMEZONE) += lenovo-wmi-gamezone.o
> +obj-$(CONFIG_LENOVO_WMI_DATA01) += lenovo-wmi-capdata01.o
>
> # Intel
> obj-y += intel/
> diff --git a/drivers/platform/x86/lenovo-wmi-capdata01.c b/drivers/platform/x86/lenovo-wmi-capdata01.c
> new file mode 100644
> index 000000000000..b10a6e4b320f
> --- /dev/null
> +++ b/drivers/platform/x86/lenovo-wmi-capdata01.c
> @@ -0,0 +1,131 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * LENOVO_CAPABILITY_DATA_01 WMI data block driver. This interface provides
> + * information on tunable attributes used by the "Other Method" WMI interface,
> + * including if it is supported by the hardware, the default_value, max_value,
> + * min_value, and step increment.
> + *
> + * Copyright(C) 2024 Derek J. Clark <derekjohn.clark@...il.com>
> + */
> +
> +#include <linux/list.h>
> +#include "lenovo-wmi.h"
> +
> +#define LENOVO_CAPABILITY_DATA_01_GUID "7A8F5407-CB67-4D6E-B547-39B3BE018154"
> +
> +static DEFINE_MUTEX(cd01_call_mutex);
> +static DEFINE_MUTEX(cd01_list_mutex);
> +static LIST_HEAD(cd01_wmi_list);
> +
> +static const struct wmi_device_id lenovo_wmi_capdata01_id_table[] = {
> + { LENOVO_CAPABILITY_DATA_01_GUID, NULL },
> + {}
> +};
> +
> +struct lenovo_wmi_cd01_priv {
> + struct wmi_device *wdev;
> + struct list_head list;
> +};
> +
> +static inline struct lenovo_wmi_cd01_priv *get_first_wmi_priv(void)
> +{
> + guard(mutex)(&cd01_list_mutex);
> + return list_first_entry_or_null(&cd01_wmi_list,
> + struct lenovo_wmi_cd01_priv, list);
> +}
> +
> +int lenovo_wmi_capdata01_get(struct lenovo_wmi_attr_id attr_id,
> + struct capability_data_01 *cap_data)
> +{
> + u32 attribute_id = *(int *)&attr_id;
> + struct lenovo_wmi_cd01_priv *priv;
> + union acpi_object *ret_obj;
Rather than all the kfree() paths, could this done with a scoped
automatic cleanup by using __free?
IE Similar to what you're doing with the mutexes.
You would need to adjust the declaration for the union to be within
the for loop though for this to work.
> + int instance_idx;
> + int count;
> +
> + priv = get_first_wmi_priv();
> + if (!priv)
> + return -ENODEV;
> +
> + guard(mutex)(&cd01_call_mutex);
> + count = wmidev_instance_count(priv->wdev);
> + pr_info("Got instance count: %u\n", count);
I don't think you want this to be info level. Debug at most.
> +
> + for (instance_idx = 0; instance_idx < count; instance_idx++) {
> + ret_obj = wmidev_block_query(priv->wdev, instance_idx);
> + if (!ret_obj) {
> + pr_err("WMI Data block query failed.\n");
> + continue;
> + }
> +
> + if (ret_obj->type != ACPI_TYPE_BUFFER) {
> + pr_err("WMI Data block query returned wrong type.\n");
> + kfree(ret_obj);
> + continue;
> + }
> +
> + if (ret_obj->buffer.length != sizeof(*cap_data)) {
> + pr_err("WMI Data block query returned wrong buffer length: %u vice expected %lu.\n",
> + ret_obj->buffer.length, sizeof(*cap_data));
> + kfree(ret_obj);
> + continue;
> + }
> +
> + memcpy(cap_data, ret_obj->buffer.pointer,
> + ret_obj->buffer.length);
> + kfree(ret_obj);
> +
> + if (cap_data->id != attribute_id)
> + continue;
> + break;
> + }
> +
> + if (cap_data->id != attribute_id) {
> + pr_err("Unable to find capability data for attribute_id %x\n",
> + attribute_id);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_NS_GPL(lenovo_wmi_capdata01_get, "CAPDATA_WMI");
> +
> +static int lenovo_wmi_capdata01_probe(struct wmi_device *wdev,
> + const void *context)
> +
> +{
> + struct lenovo_wmi_cd01_priv *priv;
> +
> + priv = devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->wdev = wdev;
> +
> + guard(mutex)(&cd01_list_mutex);
> + list_add_tail(&priv->list, &cd01_wmi_list);
> +
> + return 0;
> +}
> +
> +static void lenovo_wmi_capdata01_remove(struct wmi_device *wdev)
> +{
> + struct lenovo_wmi_cd01_priv *priv = dev_get_drvdata(&wdev->dev);
> +
> + guard(mutex)(&cd01_list_mutex);
> + list_del(&priv->list);
> +}
> +
> +static struct wmi_driver lenovo_wmi_capdata01_driver = {
> + .driver = { .name = "lenovo_wmi_capdata01" },
> + .id_table = lenovo_wmi_capdata01_id_table,
> + .probe = lenovo_wmi_capdata01_probe,
> + .remove = lenovo_wmi_capdata01_remove,
> +};
> +
> +module_wmi_driver(lenovo_wmi_capdata01_driver);
> +
> +MODULE_DEVICE_TABLE(wmi, lenovo_wmi_capdata01_id_table);
> +MODULE_AUTHOR("Derek J. Clark <derekjohn.clark@...il.com>");
> +MODULE_DESCRIPTION("Lenovo Capability Data 01 WMI Driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/platform/x86/lenovo-wmi.h b/drivers/platform/x86/lenovo-wmi.h
> index 8a302c6c47cb..53cea84a956b 100644
> --- a/drivers/platform/x86/lenovo-wmi.h
> +++ b/drivers/platform/x86/lenovo-wmi.h
> @@ -36,6 +36,22 @@ struct wmi_method_args {
> u32 arg1;
> };
>
> +struct lenovo_wmi_attr_id {
> + u32 mode_id : 16; /* Fan profile */
> + u32 feature_id : 8; /* Attribute (SPL/SPPT/...) */
> + u32 device_id : 8; /* CPU/GPU/... */
> +} __packed;
> +
> +/* Data struct for LENOVO_CAPABILITY_DATA_01 */
> +struct capability_data_01 {
> + u32 id;
> + u32 supported;
> + u32 default_value;
> + u32 step;
> + u32 min_value;
> + u32 max_value;
> +};
> +
> /* General Use functions */
> static int lenovo_wmidev_evaluate_method(struct wmi_device *wdev, u8 instance,
> u32 method_id, struct acpi_buffer *in,
> @@ -102,4 +118,8 @@ int lenovo_wmidev_evaluate_method_1(struct wmi_device *wdev, u8 instance,
> 0, retval);
> }
>
> +/* LENOVO_CAPABILITY_DATA_01 exported functions */
> +int lenovo_wmi_capdata01_get(struct lenovo_wmi_attr_id attr_id,
> + struct capability_data_01 *cap_data);
> +
> #endif /* !_LENOVO_WMI_H_ */
Powered by blists - more mailing lists