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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Based on arch/arm/include/asm/tlb.h
*
* Copyright (C) 2002 Russell King
* Copyright (C) 2012 ARM Ltd.
*/
#ifndef __ASM_TLB_H
#define __ASM_TLB_H
#include <linux/pagemap.h>
#include <linux/swap.h>
static inline void __tlb_remove_table(void *_table)
{
free_page_and_swap_cache((struct page *)_table);
}
#define tlb_flush tlb_flush
static void tlb_flush(struct mmu_gather *tlb);
#include <asm-generic/tlb.h>
/*
* get the tlbi levels in arm64. Default value is TLBI_TTL_UNKNOWN if more than
* one of cleared_* is set or neither is set - this elides the level hinting to
* the hardware.
*/
static inline int tlb_get_level(struct mmu_gather *tlb)
{
/* The TTL field is only valid for the leaf entry. */
if (tlb->freed_tables)
return TLBI_TTL_UNKNOWN;
if (tlb->cleared_ptes && !(tlb->cleared_pmds ||
tlb->cleared_puds ||
tlb->cleared_p4ds))
return 3;
if (tlb->cleared_pmds && !(tlb->cleared_ptes ||
tlb->cleared_puds ||
tlb->cleared_p4ds))
return 2;
if (tlb->cleared_puds && !(tlb->cleared_ptes ||
tlb->cleared_pmds ||
tlb->cleared_p4ds))
return 1;
if (tlb->cleared_p4ds && !(tlb->cleared_ptes ||
tlb->cleared_pmds ||
tlb->cleared_puds))
return 0;
return TLBI_TTL_UNKNOWN;
}
static inline void tlb_flush(struct mmu_gather *tlb)
{
struct vm_area_struct vma = TLB_FLUSH_VMA(tlb->mm, 0);
bool last_level = !tlb->freed_tables;
unsigned long stride = tlb_get_unmap_size(tlb);
int tlb_level = tlb_get_level(tlb);
/*
* If we're tearing down the address space then we only care about
* invalidating the walk-cache, since the ASID allocator won't
* reallocate our ASID without invalidating the entire TLB.
*/
if (tlb->fullmm) {
if (!last_level)
flush_tlb_mm(tlb->mm);
return;
}
__flush_tlb_range(&vma, tlb->start, tlb->end, stride,
last_level, tlb_level);
}
static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
unsigned long addr)
{
struct ptdesc *ptdesc = page_ptdesc(pte);
pagetable_pte_dtor(ptdesc);
tlb_remove_ptdesc(tlb, ptdesc);
}
#if CONFIG_PGTABLE_LEVELS > 2
static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
unsigned long addr)
{
struct ptdesc *ptdesc = virt_to_ptdesc(pmdp);
pagetable_pmd_dtor(ptdesc);
tlb_remove_ptdesc(tlb, ptdesc);
}
#endif
#if CONFIG_PGTABLE_LEVELS > 3
static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
unsigned long addr)
{
struct ptdesc *ptdesc = virt_to_ptdesc(pudp);
pagetable_pud_dtor(ptdesc);
tlb_remove_ptdesc(tlb, ptdesc);
}
#endif
#endif
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