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Message-Id: <20240802151430.99114-9-alexghiti@rivosinc.com>
Date: Fri, 2 Aug 2024 17:14:29 +0200
From: Alexandre Ghiti <alexghiti@...osinc.com>
To: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Ryan Roberts <ryan.roberts@....com>,
Mark Rutland <mark.rutland@....com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
linux-riscv@...ts.infradead.org,
linux-mm@...ck.org
Cc: Alexandre Ghiti <alexghiti@...osinc.com>
Subject: [PATCH v3 8/9] mm: Use common huge_ptep_set_wrprotect() function for riscv/arm64
After some adjustments, both architectures have the same implementation
so move it to the generic code.
Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
---
arch/arm64/include/asm/hugetlb.h | 3 ---
arch/arm64/mm/hugetlbpage.c | 27 ---------------------------
arch/riscv/include/asm/hugetlb.h | 4 ----
arch/riscv/include/asm/pgtable.h | 7 ++++---
arch/riscv/mm/hugetlbpage.c | 22 ----------------------
include/linux/hugetlb_contpte.h | 4 ++++
mm/hugetlb_contpte.c | 22 ++++++++++++++++++++++
7 files changed, 30 insertions(+), 59 deletions(-)
diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
index 6b84e287b72d..4ceb6cb1bec5 100644
--- a/arch/arm64/include/asm/hugetlb.h
+++ b/arch/arm64/include/asm/hugetlb.h
@@ -27,9 +27,6 @@ static inline void arch_clear_hugetlb_flags(struct folio *folio)
pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags);
#define arch_make_huge_pte arch_make_huge_pte
-#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
-extern void huge_ptep_set_wrprotect(struct mm_struct *mm,
- unsigned long addr, pte_t *ptep);
#define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
extern pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep);
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 658635022e4d..8d271e175848 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -266,33 +266,6 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
return entry;
}
-void huge_ptep_set_wrprotect(struct mm_struct *mm,
- unsigned long addr, pte_t *ptep)
-{
- unsigned long pfn, dpfn;
- pgprot_t hugeprot;
- int ncontig, i;
- size_t pgsize;
- pte_t pte;
-
- if (!pte_cont(__ptep_get(ptep))) {
- __ptep_set_wrprotect(mm, addr, ptep);
- return;
- }
-
- ncontig = find_num_contig(mm, addr, ptep, &pgsize);
- dpfn = pgsize >> PAGE_SHIFT;
-
- pte = get_clear_contig_flush(mm, addr, ptep, pgsize, ncontig);
- pte = pte_wrprotect(pte);
-
- hugeprot = pte_pgprot(pte);
- pfn = pte_pfn(pte);
-
- for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
- __set_ptes(mm, addr, ptep, pfn_pte(pfn, hugeprot), 1);
-}
-
pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep)
{
diff --git a/arch/riscv/include/asm/hugetlb.h b/arch/riscv/include/asm/hugetlb.h
index bf533c2cef84..4c692dd82779 100644
--- a/arch/riscv/include/asm/hugetlb.h
+++ b/arch/riscv/include/asm/hugetlb.h
@@ -24,10 +24,6 @@ bool arch_hugetlb_migration_supported(struct hstate *h);
pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep);
-#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
-void huge_ptep_set_wrprotect(struct mm_struct *mm,
- unsigned long addr, pte_t *ptep);
-
pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags);
#define arch_make_huge_pte arch_make_huge_pte
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 5d9b051ac51c..f4bb0c971bd8 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -639,9 +639,8 @@ static inline pte_t __ptep_get_and_clear(struct mm_struct *mm,
return pte;
}
-#define __HAVE_ARCH_PTEP_SET_WRPROTECT
-static inline void ptep_set_wrprotect(struct mm_struct *mm,
- unsigned long address, pte_t *ptep)
+static inline void __ptep_set_wrprotect(struct mm_struct *mm,
+ unsigned long address, pte_t *ptep)
{
atomic_long_and(~(unsigned long)_PAGE_WRITE, (atomic_long_t *)ptep);
}
@@ -735,6 +734,8 @@ static inline pte_t ptep_get(pte_t *ptep)
#define pte_clear __pte_clear
#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
#define ptep_set_access_flags __ptep_set_access_flags
+#define __HAVE_ARCH_PTEP_SET_WRPROTECT
+#define ptep_set_wrprotect __ptep_set_wrprotect
#define pgprot_nx pgprot_nx
static inline pgprot_t pgprot_nx(pgprot_t _prot)
diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c
index 0e2ca7327479..8963a4e77742 100644
--- a/arch/riscv/mm/hugetlbpage.c
+++ b/arch/riscv/mm/hugetlbpage.c
@@ -173,28 +173,6 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
return entry;
}
-void huge_ptep_set_wrprotect(struct mm_struct *mm,
- unsigned long addr,
- pte_t *ptep)
-{
- pte_t pte = ptep_get(ptep);
- pte_t orig_pte;
- int pte_num;
-
- if (!pte_napot(pte)) {
- ptep_set_wrprotect(mm, addr, ptep);
- return;
- }
-
- pte_num = arch_contpte_get_num_contig(mm, addr, ptep, 0, NULL);
-
- orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num);
-
- orig_pte = pte_wrprotect(orig_pte);
-
- set_ptes(mm, addr, ptep, orig_pte, pte_num);
-}
-
pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
unsigned long addr,
pte_t *ptep)
diff --git a/include/linux/hugetlb_contpte.h b/include/linux/hugetlb_contpte.h
index fea47035ac38..02bce0ed93d8 100644
--- a/include/linux/hugetlb_contpte.h
+++ b/include/linux/hugetlb_contpte.h
@@ -27,4 +27,8 @@ extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep,
pte_t pte, int dirty);
+#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
+extern void huge_ptep_set_wrprotect(struct mm_struct *mm,
+ unsigned long addr, pte_t *ptep);
+
#endif /* _LINUX_HUGETLB_CONTPTE_H */
diff --git a/mm/hugetlb_contpte.c b/mm/hugetlb_contpte.c
index 21f5c89daa6b..b00bbcc2d939 100644
--- a/mm/hugetlb_contpte.c
+++ b/mm/hugetlb_contpte.c
@@ -14,6 +14,7 @@
* - __ptep_get_and_clear()
* - __pte_clear()
* - __ptep_set_access_flags()
+ * - __ptep_set_wrprotect()
* - pte_cont()
* - arch_contpte_get_num_contig()
*/
@@ -25,6 +26,7 @@
* - huge_pte_clear()
* - huge_ptep_get_and_clear()
* - huge_ptep_set_access_flags()
+ * - huge_ptep_set_wrprotect()
*/
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
@@ -232,3 +234,23 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
return 1;
}
+
+void huge_ptep_set_wrprotect(struct mm_struct *mm,
+ unsigned long addr, pte_t *ptep)
+{
+ int ncontig;
+ size_t pgsize;
+ pte_t pte;
+
+ if (!pte_cont(__ptep_get(ptep))) {
+ __ptep_set_wrprotect(mm, addr, ptep);
+ return;
+ }
+
+ ncontig = arch_contpte_get_num_contig(mm, addr, ptep, 0, &pgsize);
+
+ pte = get_clear_contig_flush(mm, addr, ptep, pgsize, ncontig);
+ pte = pte_wrprotect(pte);
+
+ set_contptes(mm, addr, ptep, pte, ncontig, pgsize);
+}
--
2.39.2
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