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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
*
* (C) COPYRIGHT 2019-2021 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU license.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you can access it online at
* http://www.gnu.org/licenses/gpl-2.0.html.
*
*/
#ifndef _PROTECTED_MEMORY_ALLOCATOR_H_
#define _PROTECTED_MEMORY_ALLOCATOR_H_
#include <linux/mm.h>
/**
* struct protected_memory_allocation - Protected memory allocation
*
* @pa: Physical address of the protected memory allocation.
* @order: Size of memory allocation in pages, as a base-2 logarithm.
*/
struct protected_memory_allocation {
phys_addr_t pa;
unsigned int order;
};
struct protected_memory_allocator_device;
/**
* struct protected_memory_allocator_ops - Callbacks for protected memory
* allocator operations
*
* @pma_alloc_page: Callback to allocate protected memory
* @pma_get_phys_addr: Callback to get the physical address of an allocation
* @pma_free_page: Callback to free protected memory
*/
struct protected_memory_allocator_ops {
/**
* pma_alloc_page - Allocate protected memory pages
*
* @pma_dev: The protected memory allocator the request is being made
* through.
* @order: How many pages to allocate, as a base-2 logarithm.
*
* Return: Pointer to allocated memory, or NULL if allocation failed.
*/
struct protected_memory_allocation *(*pma_alloc_page)(
struct protected_memory_allocator_device *pma_dev,
unsigned int order);
/**
* pma_get_phys_addr - Get the physical address of the protected memory
* allocation
*
* @pma_dev: The protected memory allocator the request is being made
* through.
* @pma: The protected memory allocation whose physical address
* shall be retrieved
*
* Return: The physical address of the given allocation.
*/
phys_addr_t (*pma_get_phys_addr)(
struct protected_memory_allocator_device *pma_dev,
struct protected_memory_allocation *pma);
/**
* pma_free_page - Free a page of memory
*
* @pma_dev: The protected memory allocator the request is being made
* through.
* @pma: The protected memory allocation to free.
*/
void (*pma_free_page)(
struct protected_memory_allocator_device *pma_dev,
struct protected_memory_allocation *pma);
};
/**
* struct protected_memory_allocator_device - Device structure for protected
* memory allocator
*
* @ops: Callbacks associated with this device
* @owner: Pointer to the module owner
*
* In order for a system integrator to provide custom behaviors for protected
* memory operations performed by the kbase module (controller driver),
* they shall provide a platform-specific driver module which implements
* this interface.
*
* This structure should be registered with the platform device using
* platform_set_drvdata().
*/
struct protected_memory_allocator_device {
struct protected_memory_allocator_ops ops;
struct module *owner;
};
#endif /* _PROTECTED_MEMORY_ALLOCATOR_H_ */
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