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