linux-kernel - [RFC PATCH v1 3/3] arm64: tlb: add support for TTL in some functions

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Date:   Wed, 11 Mar 2020 10:53:09 +0800
From:   Zhenyu Ye <yezhenyu2@...wei.com>
To:     <mark.rutland@....com>, <catalin.marinas@....com>,
        <will@...nel.org>, <aneesh.kumar@...ux.ibm.com>, <maz@...nel.org>,
        <steven.price@....com>, <broonie@...nel.org>,
        <guohanjun@...wei.com>
CC:     <yezhenyu2@...wei.com>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linux-mm@...ck.org>, <arm@...nel.org>, <xiexiangyou@...wei.com>,
        <prime.zeng@...ilicon.com>
Subject: [RFC PATCH v1 3/3] arm64: tlb: add support for TTL in some functions

Add support for TTL in some ARM64-Architecture functions. The
relevant functions are:

	__pte_free_tlb
	__pmd_free_tlb
	__pud_free_tlb
	clear_flush
	get_clear_flush

Signed-off-by: Zhenyu Ye <yezhenyu2@...wei.com>
---
 arch/arm64/include/asm/tlb.h | 3 +++
 arch/arm64/mm/hugetlbpage.c  | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/arch/arm64/include/asm/tlb.h b/arch/arm64/include/asm/tlb.h
index b76df828e6b7..36428ce53185 100644
--- a/arch/arm64/include/asm/tlb.h
+++ b/arch/arm64/include/asm/tlb.h
@@ -44,6 +44,7 @@ static inline void tlb_flush(struct mmu_gather *tlb)
 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
 				  unsigned long addr)
 {
+	tlb->mm->context.flags = TLBI_LEVEL_3;
 	pgtable_pte_page_dtor(pte);
 	tlb_remove_table(tlb, pte);
 }
@@ -53,6 +54,7 @@ static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
 				  unsigned long addr)
 {
 	struct page *page = virt_to_page(pmdp);
+	tlb->mm->context.flags = TLBI_LEVEL_2;
 
 	pgtable_pmd_page_dtor(page);
 	tlb_remove_table(tlb, page);
@@ -63,6 +65,7 @@ static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
 				  unsigned long addr)
 {
+	tlb->mm->context.flags = TLBI_LEVEL_1;
 	tlb_remove_table(tlb, virt_to_page(pudp));
 }
 #endif
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index bbeb6a5a6ba6..4c2f1b802cb8 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -141,6 +141,7 @@ static pte_t get_clear_flush(struct mm_struct *mm,
 
 	if (valid) {
 		struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0);
+		mm->context.flags = TLBI_LEVEL_3;
 		flush_tlb_range(&vma, saddr, addr);
 	}
 	return orig_pte;
@@ -163,6 +164,7 @@ static void clear_flush(struct mm_struct *mm,
 {
 	struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0);
 	unsigned long i, saddr = addr;
+	mm->context.flags = TLBI_LEVEL_3;
 
 	for (i = 0; i < ncontig; i++, addr += pgsize, ptep++)
 		pte_clear(mm, addr, ptep);
-- 
2.19.1