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