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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_BOOK3S_64_TLBFLUSH_H
#define _ASM_POWERPC_BOOK3S_64_TLBFLUSH_H
#define MMU_NO_CONTEXT ~0UL
#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_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 3.1B, 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_protnone(unsigned long pte)
{
return (pte & (pgprot_val(PAGE_NONE) | _PAGE_RWX)) == pgprot_val(PAGE_NONE);
}
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(!__pte_protnone(oldval) && oldval & _PAGE_PRIVILEGED);
VM_WARN_ON_ONCE(!__pte_protnone(newval) && 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 */
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