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Message-Id: <20240802151430.99114-10-alexghiti@rivosinc.com>
Date: Fri, 2 Aug 2024 17:14:30 +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 9/9] mm: Use common huge_ptep_clear_flush() 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 | 61 --------------------------------
arch/riscv/include/asm/hugetlb.h | 7 +---
arch/riscv/mm/hugetlbpage.c | 51 --------------------------
include/linux/hugetlb_contpte.h | 4 +++
mm/hugetlb_contpte.c | 15 ++++++++
6 files changed, 20 insertions(+), 121 deletions(-)
diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
index 4ceb6cb1bec5..93c44a76c994 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_CLEAR_FLUSH
-extern pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep);
void __init arm64_hugetlb_cma_reserve(void);
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 8d271e175848..ad04641261dc 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -98,53 +98,6 @@ int find_num_contig(struct mm_struct *mm, unsigned long addr,
return CONT_PTES;
}
-/*
- * Changing some bits of contiguous entries requires us to follow a
- * Break-Before-Make approach, breaking the whole contiguous set
- * before we can change any entries. See ARM DDI 0487A.k_iss10775,
- * "Misprogramming of the Contiguous bit", page D4-1762.
- *
- * This helper performs the break step.
- */
-static pte_t get_clear_contig(struct mm_struct *mm,
- unsigned long addr,
- pte_t *ptep,
- unsigned long pgsize,
- unsigned long ncontig)
-{
- pte_t orig_pte = __ptep_get(ptep);
- unsigned long i;
-
- for (i = 0; i < ncontig; i++, addr += pgsize, ptep++) {
- pte_t pte = __ptep_get_and_clear(mm, addr, ptep);
-
- /*
- * If HW_AFDBM is enabled, then the HW could turn on
- * the dirty or accessed bit for any page in the set,
- * so check them all.
- */
- if (pte_dirty(pte))
- orig_pte = pte_mkdirty(orig_pte);
-
- if (pte_young(pte))
- orig_pte = pte_mkyoung(orig_pte);
- }
- return orig_pte;
-}
-
-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;
-}
-
pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, unsigned long sz)
{
@@ -266,20 +219,6 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
return entry;
}
-pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep)
-{
- struct mm_struct *mm = vma->vm_mm;
- size_t pgsize;
- int ncontig;
-
- if (!pte_cont(__ptep_get(ptep)))
- return ptep_clear_flush(vma, addr, ptep);
-
- ncontig = find_num_contig(mm, addr, ptep, &pgsize);
- return get_clear_contig_flush(mm, addr, ptep, pgsize, ncontig);
-}
-
static int __init hugetlbpage_init(void)
{
if (pud_sect_supported())
diff --git a/arch/riscv/include/asm/hugetlb.h b/arch/riscv/include/asm/hugetlb.h
index 4c692dd82779..63c7e4fa342a 100644
--- a/arch/riscv/include/asm/hugetlb.h
+++ b/arch/riscv/include/asm/hugetlb.h
@@ -20,14 +20,9 @@ bool arch_hugetlb_migration_supported(struct hstate *h);
#endif
#ifdef CONFIG_RISCV_ISA_SVNAPOT
-#define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
-pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
- 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
-
-#endif /*CONFIG_RISCV_ISA_SVNAPOT*/
+#endif /* CONFIG_RISCV_ISA_SVNAPOT */
#include <asm-generic/hugetlb.h>
diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c
index 8963a4e77742..ea1ae3a43d45 100644
--- a/arch/riscv/mm/hugetlbpage.c
+++ b/arch/riscv/mm/hugetlbpage.c
@@ -121,42 +121,6 @@ unsigned long hugetlb_mask_last_page(struct hstate *h)
return 0UL;
}
-static pte_t get_clear_contig(struct mm_struct *mm,
- unsigned long addr,
- pte_t *ptep,
- unsigned long pte_num)
-{
- pte_t orig_pte = ptep_get(ptep);
- unsigned long i;
-
- for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) {
- pte_t pte = ptep_get_and_clear(mm, addr, ptep);
-
- if (pte_dirty(pte))
- orig_pte = pte_mkdirty(orig_pte);
-
- if (pte_young(pte))
- orig_pte = pte_mkyoung(orig_pte);
- }
-
- return orig_pte;
-}
-
-static pte_t get_clear_contig_flush(struct mm_struct *mm,
- unsigned long addr,
- pte_t *ptep,
- unsigned long pte_num)
-{
- pte_t orig_pte = get_clear_contig(mm, addr, ptep, pte_num);
- struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0);
- bool valid = !pte_none(orig_pte);
-
- if (valid)
- flush_tlb_range(&vma, addr, addr + (PAGE_SIZE * pte_num));
-
- return orig_pte;
-}
-
pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
{
unsigned long order;
@@ -173,21 +137,6 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
return entry;
}
-pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
- unsigned long addr,
- pte_t *ptep)
-{
- pte_t pte = ptep_get(ptep);
- int pte_num;
-
- if (!pte_napot(pte))
- return ptep_clear_flush(vma, addr, ptep);
-
- pte_num = arch_contpte_get_num_contig(vma->vm_mm, addr, ptep, 0, NULL);
-
- return get_clear_contig_flush(vma->vm_mm, addr, ptep, pte_num);
-}
-
static bool is_napot_size(unsigned long size)
{
unsigned long order;
diff --git a/include/linux/hugetlb_contpte.h b/include/linux/hugetlb_contpte.h
index 02bce0ed93d8..911b9cd4aa4d 100644
--- a/include/linux/hugetlb_contpte.h
+++ b/include/linux/hugetlb_contpte.h
@@ -31,4 +31,8 @@ extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
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);
+
#endif /* _LINUX_HUGETLB_CONTPTE_H */
diff --git a/mm/hugetlb_contpte.c b/mm/hugetlb_contpte.c
index b00bbcc2d939..c8ea81883184 100644
--- a/mm/hugetlb_contpte.c
+++ b/mm/hugetlb_contpte.c
@@ -27,6 +27,7 @@
* - huge_ptep_get_and_clear()
* - huge_ptep_set_access_flags()
* - huge_ptep_set_wrprotect()
+ * - huge_ptep_clear_flush()
*/
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
@@ -254,3 +255,17 @@ void huge_ptep_set_wrprotect(struct mm_struct *mm,
set_contptes(mm, addr, ptep, pte, ncontig, pgsize);
}
+
+pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep)
+{
+ struct mm_struct *mm = vma->vm_mm;
+ size_t pgsize;
+ int ncontig;
+
+ if (!pte_cont(__ptep_get(ptep)))
+ return ptep_clear_flush(vma, addr, ptep);
+
+ ncontig = arch_contpte_get_num_contig(mm, addr, ptep, 0, &pgsize);
+ return get_clear_contig_flush(mm, addr, ptep, pgsize, ncontig);
+}
--
2.39.2
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