Quelle tlbflush.h
Sprache: C
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_BOOK3S_64_TLBFLUSH_H
#define _ASM_POWERPC_BOOK3S_64_TLBFLUSH_H
#define MMU_NO_CONTEXT ~0 UL
#include <linux/mm_types.h>
#include <linux/mmu_notifier.h>
#include <asm /book3s/64 /tlbflush-hash.h>
#include <asm /book3s/64 /tlbflush-radix.h>
/* TLB flush actions. Used as argument to tlbiel_all() */
enum {
TLB_INVAL_SCOPE_GLOBAL = 0 , /* invalidate all TLBs */
TLB_INVAL_SCOPE_LPID = 1 , /* invalidate TLBs for current LPID */
};
static inline void tlbiel_all(void )
{
/*
* This is used for host machine check and bootup .
*
* This uses early_radix_enabled and implementations use
* early_cpu_has_feature etc because that works early in boot
* and this is the machine check path which is not performance
* critical .
*/
if (early_radix_enabled())
radix__tlbiel_all(TLB_INVAL_SCOPE_GLOBAL);
else
hash__tlbiel_all(TLB_INVAL_SCOPE_GLOBAL);
}
static inline void tlbiel_all_lpid(bool radix)
{
/*
* This is used for guest machine check .
*/
if (radix)
radix__tlbiel_all(TLB_INVAL_SCOPE_LPID);
else
hash__tlbiel_all(TLB_INVAL_SCOPE_LPID);
}
#define __HAVE_ARCH_FLUSH_PMD_TLB_RANGE
static inline void flush_pmd_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
if (radix_enabled())
radix__flush_pmd_tlb_range(vma, start, end);
}
#define __HAVE_ARCH_FLUSH_PUD_TLB_RANGE
static inline void flush_pud_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
if (radix_enabled())
radix__flush_pud_tlb_range(vma, start, end);
}
#define __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
static inline void flush_hugetlb_tlb_range(struct vm_area_struct *vma,
unsigned long start,
unsigned long end)
{
if (radix_enabled())
radix__flush_hugetlb_tlb_range(vma, start, end);
}
static inline void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
if (radix_enabled())
radix__flush_tlb_range(vma, start, end);
}
static inline void flush_tlb_kernel_range(unsigned long start,
unsigned long end)
{
if (radix_enabled())
radix__flush_tlb_kernel_range(start, end);
}
static inline void local_flush_tlb_mm(struct mm_struct *mm)
{
if (radix_enabled())
radix__local_flush_tlb_mm(mm);
}
static inline void local_flush_tlb_page(struct vm_area_struct *vma,
unsigned long vmaddr)
{
if (radix_enabled())
radix__local_flush_tlb_page(vma, vmaddr);
}
static inline void local_flush_tlb_page_psize(struct mm_struct *mm,
unsigned long vmaddr, int psize)
{
if (radix_enabled())
radix__local_flush_tlb_page_psize(mm, vmaddr, psize);
}
static inline void tlb_flush(struct mmu_gather *tlb)
{
if (radix_enabled())
radix__tlb_flush(tlb);
else
hash__tlb_flush(tlb);
}
#ifdef CONFIG_SMP
static inline void flush_tlb_mm(struct mm_struct *mm)
{
if (radix_enabled())
radix__flush_tlb_mm(mm);
}
static inline void flush_tlb_page(struct vm_area_struct *vma,
unsigned long vmaddr)
{
if (radix_enabled())
radix__flush_tlb_page(vma, vmaddr);
}
#else
#define flush_tlb_mm(mm) local_flush_tlb_mm(mm)
#define flush_tlb_page(vma, addr) local_flush_tlb_page(vma, addr)
#endif /* CONFIG_SMP */
#define flush_tlb_fix_spurious_fault flush_tlb_fix_spurious_fault
static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
unsigned long address,
pte_t *ptep)
{
/*
* Book3S 64 does not require spurious fault flushes because the PTE
* must be re - fetched in case of an access permission problem . So the
* only reason for a spurious fault should be concurrent modification
* to the PTE , in which case the PTE will eventually be re - fetched by
* the MMU when it attempts the access again .
*
* See : Power ISA Version 3 . 1 B , 6 . 10 . 1 . 2 Modifying a Translation Table
* Entry , Setting a Reference or Change Bit or Upgrading Access
* Authority ( PTE Subject to Atomic Hardware Updates ) :
*
* " If the only change being made to a valid PTE that is subject to
* atomic hardware updates is to set the Reference or Change bit to
* 1 or to upgrade access authority , a simpler sequence suffices
* because the translation hardware will refetch the PTE if an
* access is attempted for which the only problems were reference
* and / or change bits needing to be set or insufficient access
* authority . "
*
* The nest MMU in POWER9 does not perform this PTE re - fetch , but
* it avoids the spurious fault problem by flushing the TLB before
* upgrading PTE permissions , see radix__ptep_set_access_flags .
*/
}
static inline bool __pte_flags_need_flush(unsigned long oldval,
unsigned long newval)
{
unsigned long delta = oldval ^ newval;
/*
* The return value of this function doesn ' t matter for hash ,
* ptep_modify_prot_start ( ) does a pte_update ( ) which does or schedules
* any necessary hash table update and flush .
*/
if (!radix_enabled())
return true ;
/*
* We do not expect kernel mappings or non - PTEs or not - present PTEs .
*/
VM_WARN_ON_ONCE(oldval & _PAGE_PRIVILEGED);
VM_WARN_ON_ONCE(newval & _PAGE_PRIVILEGED);
VM_WARN_ON_ONCE(!(oldval & _PAGE_PTE));
VM_WARN_ON_ONCE(!(newval & _PAGE_PTE));
VM_WARN_ON_ONCE(!(oldval & _PAGE_PRESENT));
VM_WARN_ON_ONCE(!(newval & _PAGE_PRESENT));
/*
* Must flush on any change except READ , WRITE , EXEC , DIRTY , ACCESSED .
*
* In theory , some changed software bits could be tolerated , in
* practice those should rarely if ever matter .
*/
if (delta & ~(_PAGE_RWX | _PAGE_DIRTY | _PAGE_ACCESSED))
return true ;
/*
* If any of the above was present in old but cleared in new , flush .
* With the exception of _ PAGE_ACCESSED , don ' t worry about flushing
* if that was cleared ( see the comment in ptep_clear_flush_young ( ) ) .
*/
if ((delta & ~_PAGE_ACCESSED) & oldval)
return true ;
return false ;
}
static inline bool pte_needs_flush(pte_t oldpte, pte_t newpte)
{
return __pte_flags_need_flush(pte_val(oldpte), pte_val(newpte));
}
#define pte_needs_flush pte_needs_flush
static inline bool huge_pmd_needs_flush(pmd_t oldpmd, pmd_t newpmd)
{
return __pte_flags_need_flush(pmd_val(oldpmd), pmd_val(newpmd));
}
#define huge_pmd_needs_flush huge_pmd_needs_flush
extern bool tlbie_capable;
extern bool tlbie_enabled;
static inline bool cputlb_use_tlbie(void )
{
return tlbie_enabled;
}
#endif /* _ASM_POWERPC_BOOK3S_64_TLBFLUSH_H */
Messung V0.5 in Prozent C=95 H=98 G=96
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-09-28)
¤
*© Formatika GbR, Deutschland
2026-10-10
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