arch/arm64/include/asm/tlb.h

Source file repositories/reference/linux-study-clean/arch/arm64/include/asm/tlb.h

File Facts

System
Linux kernel
Corpus path
arch/arm64/include/asm/tlb.h
Extension
.h
Size
2770 bytes
Lines
121
Domain
Architecture Layer
Bucket
arch/arm64
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __ASM_TLB_H
#define __ASM_TLB_H

#include <linux/pagemap.h>


#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);
	tlbf_t flags = (tlb->freed_tables || tlb->unshared_tables) ?
			TLBF_NONE : TLBF_NOWALKCACHE;
	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 (tlb->freed_tables)
			flush_tlb_mm(tlb->mm);
		return;
	}

	__flush_tlb_range(&vma, tlb->start, tlb->end, stride,
			  tlb_level, flags);
}

static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
				  unsigned long addr)
{
	struct ptdesc *ptdesc = page_ptdesc(pte);

	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);

	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)
{

Annotation

Implementation Notes