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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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66db876162
Stubs in the header file for !CONFIG_STM32_FIREWALL case should be both
static and inline, because they do not come with earlier declaration and
should be inlined in every unit including the header.
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: stable@vger.kernel.org
Fixes: 5c9668cfc6 ("firewall: introduce stm32_firewall framework")
Link: https://lore.kernel.org/r/20250507092121.95121-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
146 lines
5.0 KiB
C
146 lines
5.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2023, STMicroelectronics - All Rights Reserved
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*/
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#ifndef STM32_FIREWALL_DEVICE_H
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#define STM32_FIREWALL_DEVICE_H
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#define STM32_FIREWALL_MAX_EXTRA_ARGS 5
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/* Opaque reference to stm32_firewall_controller */
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struct stm32_firewall_controller;
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/**
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* struct stm32_firewall - Information on a device's firewall. Each device can have more than one
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* firewall.
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*
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* @firewall_ctrl: Pointer referencing a firewall controller of the device. It is
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* opaque so a device cannot manipulate the controller's ops or access
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* the controller's data
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* @extra_args: Extra arguments that are implementation dependent
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* @entry: Name of the firewall entry
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* @extra_args_size: Number of extra arguments
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* @firewall_id: Firewall ID associated the device for this firewall controller
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*/
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struct stm32_firewall {
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struct stm32_firewall_controller *firewall_ctrl;
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u32 extra_args[STM32_FIREWALL_MAX_EXTRA_ARGS];
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const char *entry;
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size_t extra_args_size;
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u32 firewall_id;
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};
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#if IS_ENABLED(CONFIG_STM32_FIREWALL)
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/**
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* stm32_firewall_get_firewall - Get the firewall(s) associated to given device.
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* The firewall controller reference is always the first argument
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* of each of the access-controller property entries.
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* The firewall ID is always the second argument of each of the
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* access-controller property entries.
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* If there's no argument linked to the phandle, then the firewall ID
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* field is set to U32_MAX, which is an invalid ID.
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*
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* @np: Device node to parse
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* @firewall: Array of firewall references
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* @nb_firewall: Number of firewall references to get. Must be at least 1.
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*
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* Returns 0 on success, -ENODEV if there's no match with a firewall controller or appropriate errno
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* code if error occurred.
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*/
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int stm32_firewall_get_firewall(struct device_node *np, struct stm32_firewall *firewall,
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unsigned int nb_firewall);
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/**
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* stm32_firewall_grant_access - Request firewall access rights and grant access.
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*
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* @firewall: Firewall reference containing the ID to check against its firewall
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* controller
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*
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* Returns 0 if access is granted, -EACCES if access is denied, -ENODEV if firewall is null or
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* appropriate errno code if error occurred
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*/
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int stm32_firewall_grant_access(struct stm32_firewall *firewall);
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/**
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* stm32_firewall_release_access - Release access granted from a call to
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* stm32_firewall_grant_access().
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*
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* @firewall: Firewall reference containing the ID to check against its firewall
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* controller
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*/
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void stm32_firewall_release_access(struct stm32_firewall *firewall);
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/**
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* stm32_firewall_grant_access_by_id - Request firewall access rights of a given device
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* based on a specific firewall ID
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*
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* Warnings:
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* There is no way to ensure that the given ID will correspond to the firewall referenced in the
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* device node if the ID did not come from stm32_firewall_get_firewall(). In that case, this
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* function must be used with caution.
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* This function should be used for subsystem resources that do not have the same firewall ID
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* as their parent.
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* U32_MAX is an invalid ID.
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*
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* @firewall: Firewall reference containing the firewall controller
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* @subsystem_id: Firewall ID of the subsystem resource
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*
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* Returns 0 if access is granted, -EACCES if access is denied, -ENODEV if firewall is null or
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* appropriate errno code if error occurred
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*/
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int stm32_firewall_grant_access_by_id(struct stm32_firewall *firewall, u32 subsystem_id);
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/**
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* stm32_firewall_release_access_by_id - Release access granted from a call to
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* stm32_firewall_grant_access_by_id().
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*
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* Warnings:
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* There is no way to ensure that the given ID will correspond to the firewall referenced in the
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* device node if the ID did not come from stm32_firewall_get_firewall(). In that case, this
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* function must be used with caution.
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* This function should be used for subsystem resources that do not have the same firewall ID
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* as their parent.
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* U32_MAX is an invalid ID.
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*
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* @firewall: Firewall reference containing the firewall controller
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* @subsystem_id: Firewall ID of the subsystem resource
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*/
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void stm32_firewall_release_access_by_id(struct stm32_firewall *firewall, u32 subsystem_id);
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#else /* CONFIG_STM32_FIREWALL */
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static inline int stm32_firewall_get_firewall(struct device_node *np,
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struct stm32_firewall *firewall,
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unsigned int nb_firewall)
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{
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return -ENODEV;
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}
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static inline int stm32_firewall_grant_access(struct stm32_firewall *firewall)
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{
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return -ENODEV;
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}
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static inline void stm32_firewall_release_access(struct stm32_firewall *firewall)
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{
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}
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static inline int stm32_firewall_grant_access_by_id(struct stm32_firewall *firewall,
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u32 subsystem_id)
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{
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return -ENODEV;
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}
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static inline void stm32_firewall_release_access_by_id(struct stm32_firewall *firewall,
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u32 subsystem_id)
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{
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}
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#endif /* CONFIG_STM32_FIREWALL */
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#endif /* STM32_FIREWALL_DEVICE_H */
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