/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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*
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* (C) COPYRIGHT 2014-2015, 2018-2021 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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/**
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* DOC: Interface file for accessing MMU hardware functionality
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*
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* This module provides an abstraction for accessing the functionality provided
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* by the midgard MMU and thus allows all MMU HW access to be contained within
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* one common place and allows for different backends (implementations) to
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* be provided.
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*/
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#ifndef _KBASE_MMU_HW_H_
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#define _KBASE_MMU_HW_H_
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/* Forward declarations */
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struct kbase_device;
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struct kbase_as;
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struct kbase_context;
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/**
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* enum kbase_mmu_fault_type - MMU fault type descriptor.
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* @KBASE_MMU_FAULT_TYPE_UNKNOWN: unknown fault
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* @KBASE_MMU_FAULT_TYPE_PAGE: page fault
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* @KBASE_MMU_FAULT_TYPE_BUS: nus fault
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* @KBASE_MMU_FAULT_TYPE_PAGE_UNEXPECTED: page_unexpected fault
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* @KBASE_MMU_FAULT_TYPE_BUS_UNEXPECTED: bus_unexpected fault
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*/
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enum kbase_mmu_fault_type {
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KBASE_MMU_FAULT_TYPE_UNKNOWN = 0,
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KBASE_MMU_FAULT_TYPE_PAGE,
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KBASE_MMU_FAULT_TYPE_BUS,
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KBASE_MMU_FAULT_TYPE_PAGE_UNEXPECTED,
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KBASE_MMU_FAULT_TYPE_BUS_UNEXPECTED
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};
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/**
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* kbase_mmu_hw_configure - Configure an address space for use.
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* @kbdev: kbase device to configure.
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* @as: address space to configure.
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*
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* Configure the MMU using the address space details setup in the
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* kbase_context structure.
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*/
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void kbase_mmu_hw_configure(struct kbase_device *kbdev,
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struct kbase_as *as);
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/**
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* kbase_mmu_hw_do_operation - Issue an operation to the MMU.
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* @kbdev: kbase device to issue the MMU operation on.
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* @as: address space to issue the MMU operation on.
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* @vpfn: MMU Virtual Page Frame Number to start the operation on.
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* @nr: Number of pages to work on.
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* @type: Operation type (written to ASn_COMMAND).
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* @handling_irq: Is this operation being called during the handling
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* of an interrupt?
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*
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* Issue an operation (MMU invalidate, MMU flush, etc) on the address space that
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* is associated with the provided kbase_context over the specified range
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*
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* Return: Zero if the operation was successful, non-zero otherwise.
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*/
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int kbase_mmu_hw_do_operation(struct kbase_device *kbdev, struct kbase_as *as,
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u64 vpfn, u32 nr, u32 type,
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unsigned int handling_irq);
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/**
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* kbase_mmu_hw_clear_fault - Clear a fault that has been previously reported by
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* the MMU.
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* @kbdev: kbase device to clear the fault from.
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* @as: address space to clear the fault from.
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* @type: The type of fault that needs to be cleared.
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*
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* Clear a bus error or page fault that has been reported by the MMU.
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*/
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void kbase_mmu_hw_clear_fault(struct kbase_device *kbdev, struct kbase_as *as,
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enum kbase_mmu_fault_type type);
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/**
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* kbase_mmu_hw_enable_fault - Enable fault that has been previously reported by
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* the MMU.
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* @kbdev: kbase device to again enable the fault from.
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* @as: address space to again enable the fault from.
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* @type: The type of fault that needs to be enabled again.
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*
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* After a page fault or bus error has been reported by the MMU these
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* will be disabled. After these are handled this function needs to be
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* called to enable the page fault or bus error fault again.
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*/
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void kbase_mmu_hw_enable_fault(struct kbase_device *kbdev, struct kbase_as *as,
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enum kbase_mmu_fault_type type);
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#endif /* _KBASE_MMU_HW_H_ */
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