linux-kernel - [PATCH v1 09/13] arm64: mm: Refactor flush_tlb_page() to use __tlbi_level

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Message-ID: <20251216144601.2106412-10-ryan.roberts@arm.com>
Date: Tue, 16 Dec 2025 14:45:54 +0000
From: Ryan Roberts <ryan.roberts@....com>
To: Will Deacon <will@...nel.org>,
	Ard Biesheuvel <ardb@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Mark Rutland <mark.rutland@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Marc Zyngier <maz@...nel.org>,
	Dev Jain <dev.jain@....com>,
	Linu Cherian <Linu.Cherian@....com>
Cc: Ryan Roberts <ryan.roberts@....com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 09/13] arm64: mm: Refactor flush_tlb_page() to use __tlbi_level_asid()

Now that we have __tlbi_level_asid(), let's refactor the
*flush_tlb_page*() variants to use it rather than open coding.

The emitted tlbi(s) is/are intended to be exactly the same as before; no
TTL hint is provided. Although the spec for flush_tlb_page() allows for
setting the TTL hint to 3, it turns out that
flush_tlb_fix_spurious_fault_pmd() depends on
local_flush_tlb_page_nonotify() to invalidate the level 2 entry. This
will be fixed separately.

Signed-off-by: Ryan Roberts <ryan.roberts@....com>
---
 arch/arm64/include/asm/tlbflush.h | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
index 3b72a71feac0..37c782ddc149 100644
--- a/arch/arm64/include/asm/tlbflush.h
+++ b/arch/arm64/include/asm/tlbflush.h
@@ -327,12 +327,8 @@ static inline void flush_tlb_mm(struct mm_struct *mm)
 static inline void __local_flush_tlb_page_nonotify_nosync(struct mm_struct *mm,
 							  unsigned long uaddr)
 {
-	unsigned long addr;
-
 	dsb(nshst);
-	addr = __TLBI_VADDR(uaddr, ASID(mm));
-	__tlbi(vale1, addr);
-	__tlbi_user(vale1, addr);
+	__tlbi_level_asid(vale1, uaddr, TLBI_TTL_UNKNOWN, ASID(mm));
 }
 
 static inline void local_flush_tlb_page_nonotify(struct vm_area_struct *vma,
@@ -354,12 +350,8 @@ static inline void local_flush_tlb_page(struct vm_area_struct *vma,
 static inline void __flush_tlb_page_nosync(struct mm_struct *mm,
 					   unsigned long uaddr)
 {
-	unsigned long addr;
-
 	dsb(ishst);
-	addr = __TLBI_VADDR(uaddr, ASID(mm));
-	__tlbi(vale1is, addr);
-	__tlbi_user(vale1is, addr);
+	__tlbi_level_asid(vale1is, uaddr, TLBI_TTL_UNKNOWN, ASID(mm));
 	mmu_notifier_arch_invalidate_secondary_tlbs(mm, uaddr & PAGE_MASK,
 						(uaddr & PAGE_MASK) + PAGE_SIZE);
 }
-- 
2.43.0