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Message-Id: <20240802151430.99114-8-alexghiti@rivosinc.com>
Date: Fri, 2 Aug 2024 17:14:28 +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 7/9] mm: Use common huge_ptep_set_access_flags() function for riscv/arm64
Both architectures have almost the same implementation:
__cont_access_flags_changed() is also correct on riscv and brings the
same benefits (ie don't do anything if the flags are unchanged).
As in the previous commit, get_clear_contig_flush() is duplicated in both
the arch and the generic codes, it will be removed from the arch code when
the last reference there gets moved to the generic code.
Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
---
arch/arm64/include/asm/hugetlb.h | 4 --
arch/arm64/mm/hugetlbpage.c | 65 ---------------------------
arch/riscv/include/asm/hugetlb.h | 5 ---
arch/riscv/include/asm/pgtable.h | 7 +--
arch/riscv/mm/hugetlbpage.c | 28 ------------
arch/riscv/mm/pgtable.c | 6 +--
include/linux/hugetlb_contpte.h | 5 +++
mm/hugetlb_contpte.c | 75 ++++++++++++++++++++++++++++++++
8 files changed, 87 insertions(+), 108 deletions(-)
diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
index 04117a84dc04..6b84e287b72d 100644
--- a/arch/arm64/include/asm/hugetlb.h
+++ b/arch/arm64/include/asm/hugetlb.h
@@ -27,10 +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_ACCESS_FLAGS
-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);
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 2f3753c10c1f..658635022e4d 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -266,71 +266,6 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
return entry;
}
-/*
- * huge_ptep_set_access_flags will update access flags (dirty, accesssed)
- * and write permission.
- *
- * For a contiguous huge pte range we need to check whether or not write
- * permission has to change only on the first pte in the set. Then for
- * all the contiguous ptes we need to check whether or not there is a
- * discrepancy between dirty or young.
- */
-static int __cont_access_flags_changed(pte_t *ptep, pte_t pte, int ncontig)
-{
- int i;
-
- if (pte_write(pte) != pte_write(__ptep_get(ptep)))
- return 1;
-
- for (i = 0; i < ncontig; i++) {
- pte_t orig_pte = __ptep_get(ptep + i);
-
- if (pte_dirty(pte) != pte_dirty(orig_pte))
- return 1;
-
- if (pte_young(pte) != pte_young(orig_pte))
- return 1;
- }
-
- return 0;
-}
-
-int huge_ptep_set_access_flags(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep,
- pte_t pte, int dirty)
-{
- int ncontig, i;
- size_t pgsize = 0;
- unsigned long pfn = pte_pfn(pte), dpfn;
- struct mm_struct *mm = vma->vm_mm;
- pgprot_t hugeprot;
- pte_t orig_pte;
-
- if (!pte_cont(pte))
- return __ptep_set_access_flags(vma, addr, ptep, pte, dirty);
-
- ncontig = find_num_contig(mm, addr, ptep, &pgsize);
- dpfn = pgsize >> PAGE_SHIFT;
-
- if (!__cont_access_flags_changed(ptep, pte, ncontig))
- return 0;
-
- orig_pte = get_clear_contig_flush(mm, addr, ptep, pgsize, ncontig);
-
- /* Make sure we don't lose the dirty or young state */
- if (pte_dirty(orig_pte))
- pte = pte_mkdirty(pte);
-
- if (pte_young(orig_pte))
- pte = pte_mkyoung(pte);
-
- hugeprot = pte_pgprot(pte);
- for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
- __set_ptes(mm, addr, ptep, pfn_pte(pfn, hugeprot), 1);
-
- return 1;
-}
-
void huge_ptep_set_wrprotect(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
diff --git a/arch/riscv/include/asm/hugetlb.h b/arch/riscv/include/asm/hugetlb.h
index 0fbb6b19df79..bf533c2cef84 100644
--- a/arch/riscv/include/asm/hugetlb.h
+++ b/arch/riscv/include/asm/hugetlb.h
@@ -28,11 +28,6 @@ pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
void huge_ptep_set_wrprotect(struct mm_struct *mm,
unsigned long addr, pte_t *ptep);
-#define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
-int huge_ptep_set_access_flags(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep,
- pte_t pte, int dirty);
-
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 13e89348a46a..5d9b051ac51c 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -623,9 +623,8 @@ static inline void __pte_clear(struct mm_struct *mm,
__set_pte_at(mm, ptep, __pte(0));
}
-#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS /* defined in mm/pgtable.c */
-extern int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
- pte_t *ptep, pte_t entry, int dirty);
+extern int __ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
+ pte_t *ptep, pte_t entry, int dirty);
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG /* defined in mm/pgtable.c */
extern int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long address,
pte_t *ptep);
@@ -734,6 +733,8 @@ static inline pte_t ptep_get(pte_t *ptep)
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
#define ptep_get_and_clear __ptep_get_and_clear
#define pte_clear __pte_clear
+#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
+#define ptep_set_access_flags __ptep_set_access_flags
#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 b44023336fd9..0e2ca7327479 100644
--- a/arch/riscv/mm/hugetlbpage.c
+++ b/arch/riscv/mm/hugetlbpage.c
@@ -173,34 +173,6 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
return entry;
}
-int huge_ptep_set_access_flags(struct vm_area_struct *vma,
- unsigned long addr,
- pte_t *ptep,
- pte_t pte,
- int dirty)
-{
- struct mm_struct *mm = vma->vm_mm;
- pte_t orig_pte;
- int pte_num;
-
- if (!pte_napot(pte))
- return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
-
- pte_num = arch_contpte_get_num_contig(vma->vm_mm, addr, ptep, 0, NULL);
-
- orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num);
-
- if (pte_dirty(orig_pte))
- pte = pte_mkdirty(pte);
-
- if (pte_young(orig_pte))
- pte = pte_mkyoung(pte);
-
- set_ptes(mm, addr, ptep, pte, pte_num);
-
- return true;
-}
-
void huge_ptep_set_wrprotect(struct mm_struct *mm,
unsigned long addr,
pte_t *ptep)
diff --git a/arch/riscv/mm/pgtable.c b/arch/riscv/mm/pgtable.c
index 533ec9055fa0..e86df7ef193c 100644
--- a/arch/riscv/mm/pgtable.c
+++ b/arch/riscv/mm/pgtable.c
@@ -5,9 +5,9 @@
#include <linux/kernel.h>
#include <linux/pgtable.h>
-int ptep_set_access_flags(struct vm_area_struct *vma,
- unsigned long address, pte_t *ptep,
- pte_t entry, int dirty)
+int __ptep_set_access_flags(struct vm_area_struct *vma,
+ unsigned long address, pte_t *ptep,
+ pte_t entry, int dirty)
{
if (!pte_same(ptep_get(ptep), entry))
__set_pte_at(vma->vm_mm, ptep, entry);
diff --git a/include/linux/hugetlb_contpte.h b/include/linux/hugetlb_contpte.h
index 20d3a3e14e14..fea47035ac38 100644
--- a/include/linux/hugetlb_contpte.h
+++ b/include/linux/hugetlb_contpte.h
@@ -22,4 +22,9 @@ extern void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
extern pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
unsigned long addr, pte_t *ptep);
+#define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
+extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep,
+ pte_t pte, int dirty);
+
#endif /* _LINUX_HUGETLB_CONTPTE_H */
diff --git a/mm/hugetlb_contpte.c b/mm/hugetlb_contpte.c
index 9df98d1a59a1..21f5c89daa6b 100644
--- a/mm/hugetlb_contpte.c
+++ b/mm/hugetlb_contpte.c
@@ -13,6 +13,7 @@
* - __set_ptes()
* - __ptep_get_and_clear()
* - __pte_clear()
+ * - __ptep_set_access_flags()
* - pte_cont()
* - arch_contpte_get_num_contig()
*/
@@ -23,6 +24,7 @@
* - set_huge_pte_at()
* - huge_pte_clear()
* - huge_ptep_get_and_clear()
+ * - huge_ptep_set_access_flags()
*/
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
@@ -157,3 +159,76 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
return get_clear_contig(mm, addr, ptep, pgsize, ncontig);
}
+
+/*
+ * huge_ptep_set_access_flags will update access flags (dirty, accesssed)
+ * and write permission.
+ *
+ * For a contiguous huge pte range we need to check whether or not write
+ * permission has to change only on the first pte in the set. Then for
+ * all the contiguous ptes we need to check whether or not there is a
+ * discrepancy between dirty or young.
+ */
+static int __cont_access_flags_changed(pte_t *ptep, pte_t pte, int ncontig)
+{
+ int i;
+
+ if (pte_write(pte) != pte_write(__ptep_get(ptep)))
+ return 1;
+
+ for (i = 0; i < ncontig; i++) {
+ pte_t orig_pte = __ptep_get(ptep + i);
+
+ if (pte_dirty(pte) != pte_dirty(orig_pte))
+ return 1;
+
+ if (pte_young(pte) != pte_young(orig_pte))
+ return 1;
+ }
+
+ return 0;
+}
+
+static pte_t get_clear_contig_flush(struct mm_struct *mm,
+ unsigned long addr,
+ pte_t *ptep,
+ unsigned long pgsize,
+ unsigned long ncontig)
+{
+ pte_t orig_pte = get_clear_contig(mm, addr, ptep, pgsize, ncontig);
+ struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0);
+
+ flush_tlb_range(&vma, addr, addr + (pgsize * ncontig));
+ return orig_pte;
+}
+
+int huge_ptep_set_access_flags(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep,
+ pte_t pte, int dirty)
+{
+ int ncontig;
+ size_t pgsize = 0;
+ struct mm_struct *mm = vma->vm_mm;
+ pte_t orig_pte;
+
+ if (!pte_cont(pte))
+ return __ptep_set_access_flags(vma, addr, ptep, pte, dirty);
+
+ ncontig = arch_contpte_get_num_contig(vma->vm_mm, addr, ptep, 0, &pgsize);
+
+ if (!__cont_access_flags_changed(ptep, pte, ncontig))
+ return 0;
+
+ orig_pte = get_clear_contig_flush(mm, addr, ptep, pgsize, ncontig);
+
+ /* Make sure we don't lose the dirty or young state */
+ if (pte_dirty(orig_pte))
+ pte = pte_mkdirty(pte);
+
+ if (pte_young(orig_pte))
+ pte = pte_mkyoung(pte);
+
+ set_contptes(mm, addr, ptep, pte, ncontig, pgsize);
+
+ return 1;
+}
--
2.39.2
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