/* 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 _KBASE_MMU_H_
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#define _KBASE_MMU_H_
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/**
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* kbase_mmu_as_init() - Initialising GPU address space object.
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*
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* This is called from device probe to initialise an address space object
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* of the device.
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*
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* @kbdev: The kbase device structure for the device (must be a valid pointer).
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* @i: Array index of address space object.
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*
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* Return: 0 on success and non-zero value on failure.
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*/
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int kbase_mmu_as_init(struct kbase_device *kbdev, int i);
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/**
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* kbase_mmu_as_term() - Terminate address space object.
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*
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* This is called upon device termination to destroy
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* the address space object of the device.
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*
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* @kbdev: The kbase device structure for the device (must be a valid pointer).
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* @i: Array index of address space object.
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*/
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void kbase_mmu_as_term(struct kbase_device *kbdev, int i);
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/**
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* kbase_mmu_init - Initialise an object representing GPU page tables
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*
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* The structure should be terminated using kbase_mmu_term()
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*
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* @kbdev: Instance of GPU platform device, allocated from the probe method.
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* @mmut: GPU page tables to be initialized.
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* @kctx: Optional kbase context, may be NULL if this set of MMU tables
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* is not associated with a context.
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* @group_id: The physical group ID from which to allocate GPU page tables.
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* Valid range is 0..(MEMORY_GROUP_MANAGER_NR_GROUPS-1).
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*
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* Return: 0 if successful, otherwise a negative error code.
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*/
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int kbase_mmu_init(struct kbase_device *kbdev, struct kbase_mmu_table *mmut,
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struct kbase_context *kctx, int group_id);
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/**
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* kbase_mmu_interrupt - Process an MMU interrupt.
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*
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* Process the MMU interrupt that was reported by the &kbase_device.
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*
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* @kbdev: Pointer to the kbase device for which the interrupt happened.
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* @irq_stat: Value of the MMU_IRQ_STATUS register.
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*/
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void kbase_mmu_interrupt(struct kbase_device *kbdev, u32 irq_stat);
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/**
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* kbase_mmu_term - Terminate an object representing GPU page tables
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*
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* This will free any page tables that have been allocated
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*
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* @kbdev: Instance of GPU platform device, allocated from the probe method.
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* @mmut: GPU page tables to be destroyed.
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*/
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void kbase_mmu_term(struct kbase_device *kbdev, struct kbase_mmu_table *mmut);
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/**
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* kbase_mmu_create_ate - Create an address translation entry
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*
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* @kbdev: Instance of GPU platform device, allocated from the probe method.
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* @phy: Physical address of the page to be mapped for GPU access.
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* @flags: Bitmask of attributes of the GPU memory region being mapped.
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* @level: Page table level for which to build an address translation entry.
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* @group_id: The physical memory group in which the page was allocated.
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* Valid range is 0..(MEMORY_GROUP_MANAGER_NR_GROUPS-1).
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*
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* This function creates an address translation entry to encode the physical
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* address of a page to be mapped for access by the GPU, along with any extra
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* attributes required for the GPU memory region.
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*
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* Return: An address translation entry, either in LPAE or AArch64 format
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* (depending on the driver's configuration).
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*/
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u64 kbase_mmu_create_ate(struct kbase_device *kbdev,
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struct tagged_addr phy, unsigned long flags, int level, int group_id);
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int kbase_mmu_insert_pages_no_flush(struct kbase_device *kbdev,
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struct kbase_mmu_table *mmut,
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const u64 start_vpfn,
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struct tagged_addr *phys, size_t nr,
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unsigned long flags, int group_id);
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int kbase_mmu_insert_pages(struct kbase_device *kbdev,
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struct kbase_mmu_table *mmut, u64 vpfn,
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struct tagged_addr *phys, size_t nr,
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unsigned long flags, int as_nr, int group_id);
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int kbase_mmu_insert_single_page(struct kbase_context *kctx, u64 vpfn,
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struct tagged_addr phys, size_t nr,
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unsigned long flags, int group_id);
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int kbase_mmu_teardown_pages(struct kbase_device *kbdev,
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struct kbase_mmu_table *mmut, u64 vpfn,
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size_t nr, int as_nr);
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int kbase_mmu_update_pages(struct kbase_context *kctx, u64 vpfn,
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struct tagged_addr *phys, size_t nr,
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unsigned long flags, int const group_id);
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/**
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* kbase_mmu_bus_fault_interrupt - Process a bus fault interrupt.
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*
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* Process the bus fault interrupt that was reported for a particular GPU
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* address space.
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*
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* @kbdev: Pointer to the kbase device for which bus fault was reported.
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* @status: Value of the GPU_FAULTSTATUS register.
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* @as_nr: GPU address space for which the bus fault occurred.
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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_bus_fault_interrupt(struct kbase_device *kbdev, u32 status,
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u32 as_nr);
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/**
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* kbase_mmu_gpu_fault_interrupt() - Report a GPU fault.
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* @kbdev: Kbase device pointer
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* @status: GPU fault status
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* @as_nr: Faulty address space
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* @address: GPU fault address
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* @as_valid: true if address space is valid
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*
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* This function builds GPU fault information to submit a work
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* for reporting the details of the fault.
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*/
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void kbase_mmu_gpu_fault_interrupt(struct kbase_device *kbdev, u32 status,
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u32 as_nr, u64 address, bool as_valid);
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#endif /* _KBASE_MMU_H_ */
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