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linux-stable/include/linux/platform_data/mlxreg.h
Vadim Pasternak 9d93d7877c platform_data/mlxreg: Add new field for secured access 
Extend structure 'mlxreg_core_data' with the field "secured". The
purpose of this field is to restrict access to some attributes, if
kernel is configured with security options, like:
LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY.
Access to some attributes, which for example, allow burning of some
hardware components, like FPGA, CPLD, SPI, etcetera can break the
system. In case user does not want to allow such access, it can disable
it by setting security options.

Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Reviewed-by: Michael Shych <michaelsh@nvidia.com>
Link: https://lore.kernel.org/r/20211002093238.3771419-7-vadimp@nvidia.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2021-10-19 10:41:56 +02:00

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/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
/*
* Copyright (C) 2017-2020 Mellanox Technologies Ltd.
*/
#ifndef __LINUX_PLATFORM_DATA_MLXREG_H
#define __LINUX_PLATFORM_DATA_MLXREG_H
#define MLXREG_CORE_LABEL_MAX_SIZE 32
#define MLXREG_CORE_WD_FEATURE_NOWAYOUT BIT(0)
#define MLXREG_CORE_WD_FEATURE_START_AT_BOOT BIT(1)
/**
* enum mlxreg_wdt_type - type of HW watchdog
*
* TYPE1 HW watchdog implementation exist in old systems.
* All new systems have TYPE2 HW watchdog.
* TYPE3 HW watchdog can exist on all systems with new CPLD.
* TYPE3 is selected by WD capability bit.
*/
enum mlxreg_wdt_type {
MLX_WDT_TYPE1,
MLX_WDT_TYPE2,
MLX_WDT_TYPE3,
};
/**
* enum mlxreg_hotplug_kind - kind of hotplug entry
*
* @MLXREG_HOTPLUG_DEVICE_NA: do not care;
* @MLXREG_HOTPLUG_LC_PRESENT: entry for line card presence in/out events;
* @MLXREG_HOTPLUG_LC_VERIFIED: entry for line card verification status events
* coming after line card security signature validation;
* @MLXREG_HOTPLUG_LC_POWERED: entry for line card power on/off events;
* @MLXREG_HOTPLUG_LC_SYNCED: entry for line card synchronization events, coming
* after hardware-firmware synchronization handshake;
* @MLXREG_HOTPLUG_LC_READY: entry for line card ready events, indicating line card
PHYs ready / unready state;
* @MLXREG_HOTPLUG_LC_ACTIVE: entry for line card active events, indicating firmware
* availability / unavailability for the ports on line card;
* @MLXREG_HOTPLUG_LC_THERMAL: entry for line card thermal shutdown events, positive
* event indicates that system should power off the line
* card for which this event has been received;
*/
enum mlxreg_hotplug_kind {
MLXREG_HOTPLUG_DEVICE_NA = 0,
MLXREG_HOTPLUG_LC_PRESENT = 1,
MLXREG_HOTPLUG_LC_VERIFIED = 2,
MLXREG_HOTPLUG_LC_POWERED = 3,
MLXREG_HOTPLUG_LC_SYNCED = 4,
MLXREG_HOTPLUG_LC_READY = 5,
MLXREG_HOTPLUG_LC_ACTIVE = 6,
MLXREG_HOTPLUG_LC_THERMAL = 7,
};
/**
* enum mlxreg_hotplug_device_action - hotplug device action required for
* driver's connectivity
*
* @MLXREG_HOTPLUG_DEVICE_DEFAULT_ACTION: probe device for 'on' event, remove
* for 'off' event;
* @MLXREG_HOTPLUG_DEVICE_PLATFORM_ACTION: probe platform device for 'on'
* event, remove for 'off' event;
* @MLXREG_HOTPLUG_DEVICE_NO_ACTION: no connectivity action is required;
*/
enum mlxreg_hotplug_device_action {
MLXREG_HOTPLUG_DEVICE_DEFAULT_ACTION = 0,
MLXREG_HOTPLUG_DEVICE_PLATFORM_ACTION = 1,
MLXREG_HOTPLUG_DEVICE_NO_ACTION = 2,
};
/**
* struct mlxreg_core_hotplug_notifier - hotplug notifier block:
*
* @identity: notifier identity name;
* @handle: user handle to be passed by user handler function;
* @user_handler: user handler function associated with the event;
*/
struct mlxreg_core_hotplug_notifier {
char identity[MLXREG_CORE_LABEL_MAX_SIZE];
void *handle;
int (*user_handler)(void *handle, enum mlxreg_hotplug_kind kind, u8 action);
};
/**
* struct mlxreg_hotplug_device - I2C device data:
*
* @adapter: I2C device adapter;
* @client: I2C device client;
* @brdinfo: device board information;
* @nr: I2C device adapter number, to which device is to be attached;
* @pdev: platform device, if device is instantiated as a platform device;
* @action: action to be performed upon event receiving;
* @handle: user handle to be passed by user handler function;
* @user_handler: user handler function associated with the event;
* @notifier: pointer to event notifier block;
*
* Structure represents I2C hotplug device static data (board topology) and
* dynamic data (related kernel objects handles).
*/
struct mlxreg_hotplug_device {
struct i2c_adapter *adapter;
struct i2c_client *client;
struct i2c_board_info *brdinfo;
int nr;
struct platform_device *pdev;
enum mlxreg_hotplug_device_action action;
void *handle;
int (*user_handler)(void *handle, enum mlxreg_hotplug_kind kind, u8 action);
struct mlxreg_core_hotplug_notifier *notifier;
};
/**
* struct mlxreg_core_data - attributes control data:
*
* @label: attribute label;
* @reg: attribute register;
* @mask: attribute access mask;
* @bit: attribute effective bit;
* @capability: attribute capability register;
* @reg_prsnt: attribute presence register;
* @reg_sync: attribute synch register;
* @reg_pwr: attribute power register;
* @reg_ena: attribute enable register;
* @mode: access mode;
* @np - pointer to node platform associated with attribute;
* @hpdev - hotplug device data;
* @notifier: pointer to event notifier block;
* @health_cntr: dynamic device health indication counter;
* @attached: true if device has been attached after good health indication;
* @regnum: number of registers occupied by multi-register attribute;
* @slot: slot number, at which device is located;
* @secured: if set indicates that entry access is secured;
*/
struct mlxreg_core_data {
char label[MLXREG_CORE_LABEL_MAX_SIZE];
u32 reg;
u32 mask;
u32 bit;
u32 capability;
u32 reg_prsnt;
u32 reg_sync;
u32 reg_pwr;
u32 reg_ena;
umode_t mode;
struct device_node *np;
struct mlxreg_hotplug_device hpdev;
struct mlxreg_core_hotplug_notifier *notifier;
u32 health_cntr;
bool attached;
u8 regnum;
u8 slot;
u8 secured;
};
/**
* struct mlxreg_core_item - same type components controlled by the driver:
*
* @data: component data;
* @kind: kind of hotplug attribute;
* @aggr_mask: group aggregation mask;
* @reg: group interrupt status register;
* @mask: group interrupt mask;
* @capability: group capability register;
* @cache: last status value for elements fro the same group;
* @count: number of available elements in the group;
* @ind: element's index inside the group;
* @inversed: if 0: 0 for signal status is OK, if 1 - 1 is OK;
* @health: true if device has health indication, false in other case;
*/
struct mlxreg_core_item {
struct mlxreg_core_data *data;
enum mlxreg_hotplug_kind kind;
u32 aggr_mask;
u32 reg;
u32 mask;
u32 capability;
u32 cache;
u8 count;
u8 ind;
u8 inversed;
u8 health;
};
/**
* struct mlxreg_core_platform_data - platform data:
*
* @data: instance private data;
* @regmap: register map of parent device;
* @counter: number of instances;
* @features: supported features of device;
* @version: implementation version;
* @identity: device identity name;
* @capability: device capability register;
*/
struct mlxreg_core_platform_data {
struct mlxreg_core_data *data;
void *regmap;
int counter;
u32 features;
u32 version;
char identity[MLXREG_CORE_LABEL_MAX_SIZE];
u32 capability;
};
/**
* struct mlxreg_core_hotplug_platform_data - hotplug platform data:
*
* @items: same type components with the hotplug capability;
* @irq: platform interrupt number;
* @regmap: register map of parent device;
* @counter: number of the components with the hotplug capability;
* @cell: location of top aggregation interrupt register;
* @mask: top aggregation interrupt common mask;
* @cell_low: location of low aggregation interrupt register;
* @mask_low: low aggregation interrupt common mask;
* @deferred_nr: I2C adapter number must be exist prior probing execution;
* @shift_nr: I2C adapter numbers must be incremented by this value;
*/
struct mlxreg_core_hotplug_platform_data {
struct mlxreg_core_item *items;
int irq;
void *regmap;
int counter;
u32 cell;
u32 mask;
u32 cell_low;
u32 mask_low;
int deferred_nr;
int shift_nr;
};
#endif /* __LINUX_PLATFORM_DATA_MLXREG_H */
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