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Message-Id: <20240508191931.46060-10-alexghiti@rivosinc.com>
Date: Wed, 8 May 2024 21:19:28 +0200
From: Alexandre Ghiti <alexghiti@...osinc.com>
To: Ryan Roberts <ryan.roberts@....com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Alexander Potapenko <glider@...gle.com>,
Marco Elver <elver@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Ard Biesheuvel <ardb@...nel.org>,
Anup Patel <anup@...infault.org>,
Atish Patra <atishp@...shpatra.org>,
Andrey Ryabinin <ryabinin.a.a@...il.com>,
Andrey Konovalov <andreyknvl@...il.com>,
Vincenzo Frascino <vincenzo.frascino@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
kasan-dev@...glegroups.com,
linux-riscv@...ts.infradead.org,
linux-efi@...r.kernel.org,
kvm@...r.kernel.org,
kvm-riscv@...ts.infradead.org,
linux-mm@...ck.org
Cc: Alexandre Ghiti <alexghiti@...osinc.com>
Subject: [PATCH 09/12] mm, riscv, arm64: Use common ptep_clear_flush_young() function
Make riscv use the contpte aware ptep_clear_flush_young() function from
arm64.
Note that riscv used to not flush the tlb after clearing the accessed
bit, which it does now: this will be improved when we implement svinval
support.
Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
---
arch/arm64/include/asm/pgtable.h | 22 ++++++++----------
arch/arm64/mm/contpte.c | 21 -----------------
arch/riscv/include/asm/pgtable.h | 12 +++++++---
include/linux/contpte.h | 2 ++
mm/contpte.c | 40 ++++++++++++++++++++++++++++++++
5 files changed, 61 insertions(+), 36 deletions(-)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 9a8702d1ad00..92c12fb85cb4 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1389,8 +1389,6 @@ extern void contpte_clear_full_ptes(struct mm_struct *mm, unsigned long addr,
extern pte_t contpte_get_and_clear_full_ptes(struct mm_struct *mm,
unsigned long addr, pte_t *ptep,
unsigned int nr, int full);
-extern int contpte_ptep_clear_flush_young(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep);
extern void contpte_wrprotect_ptes(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, unsigned int nr);
extern int contpte_ptep_set_access_flags(struct vm_area_struct *vma,
@@ -1479,16 +1477,8 @@ extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep);
#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
-static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep)
-{
- pte_t orig_pte = __ptep_get(ptep);
-
- if (likely(!pte_valid_cont(orig_pte)))
- return __ptep_clear_flush_young(vma, addr, ptep);
-
- return contpte_ptep_clear_flush_young(vma, addr, ptep);
-}
+extern int ptep_clear_flush_young(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep);
#define wrprotect_ptes wrprotect_ptes
static __always_inline void wrprotect_ptes(struct mm_struct *mm,
@@ -1616,6 +1606,14 @@ static inline void arch_contpte_flush_tlb_range(struct vm_area_struct *vma,
__flush_tlb_range(vma, start, end, stride, true, 3);
}
+static inline void arch_contpte_flush_tlb_range_nosync(struct vm_area_struct *vma,
+ unsigned long start,
+ unsigned long end,
+ unsigned long stride)
+{
+ __flush_tlb_range_nosync(vma, start, end, stride, true, 3);
+}
+
static inline int arch_contpte_get_first_ncontig(size_t *pgsize)
{
if (pgsize)
diff --git a/arch/arm64/mm/contpte.c b/arch/arm64/mm/contpte.c
index 9bf471633ca4..16940511943c 100644
--- a/arch/arm64/mm/contpte.c
+++ b/arch/arm64/mm/contpte.c
@@ -45,27 +45,6 @@ pte_t contpte_get_and_clear_full_ptes(struct mm_struct *mm,
}
EXPORT_SYMBOL_GPL(contpte_get_and_clear_full_ptes);
-int contpte_ptep_clear_flush_young(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep)
-{
- int young;
-
- young = contpte_ptep_test_and_clear_young(vma, addr, ptep);
-
- if (young) {
- /*
- * See comment in __ptep_clear_flush_young(); same rationale for
- * eliding the trailing DSB applies here.
- */
- addr = ALIGN_DOWN(addr, CONT_PTE_SIZE);
- __flush_tlb_range_nosync(vma, addr, addr + CONT_PTE_SIZE,
- PAGE_SIZE, true, 3);
- }
-
- return young;
-}
-EXPORT_SYMBOL_GPL(contpte_ptep_clear_flush_young);
-
void contpte_wrprotect_ptes(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, unsigned int nr)
{
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index d39cb24c6c4a..42c7884b8d2e 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -615,6 +615,8 @@ static inline void arch_contpte_flush_tlb_range(struct vm_area_struct *vma,
flush_tlb_mm_range(vma->vm_mm, start, end, stride);
}
+#define arch_contpte_flush_tlb_range_nosync arch_contpte_flush_tlb_range
+
static inline int arch_contpte_get_first_ncontig(size_t *pgsize)
{
if (pgsize)
@@ -758,9 +760,8 @@ static inline void __ptep_set_wrprotect(struct mm_struct *mm,
atomic_long_and(~(unsigned long)_PAGE_WRITE, (atomic_long_t *)ptep);
}
-#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
-static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
- unsigned long address, pte_t *ptep)
+static inline int __ptep_clear_flush_young(struct vm_area_struct *vma,
+ unsigned long address, pte_t *ptep)
{
/*
* This comment is borrowed from x86, but applies equally to RISC-V:
@@ -799,6 +800,9 @@ extern pte_t ptep_get_and_clear(struct mm_struct *mm,
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep);
+#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
+extern int ptep_clear_flush_young(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep);
#else /* CONFIG_THP_CONTPTE */
@@ -810,6 +814,8 @@ extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
#define ptep_get_and_clear __ptep_get_and_clear
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define ptep_test_and_clear_young __ptep_test_and_clear_young
+#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
+#define ptep_clear_flush_young __ptep_clear_flush_young
#endif /* CONFIG_THP_CONTPTE */
diff --git a/include/linux/contpte.h b/include/linux/contpte.h
index 38092adbe0d4..76a49ac8b6f5 100644
--- a/include/linux/contpte.h
+++ b/include/linux/contpte.h
@@ -21,5 +21,7 @@ void contpte_set_ptes(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte, unsigned int nr);
int contpte_ptep_test_and_clear_young(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep);
+int contpte_ptep_clear_flush_young(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep);
#endif /* _LINUX_CONTPTE_H */
diff --git a/mm/contpte.c b/mm/contpte.c
index 220e9d81f401..600277b1196c 100644
--- a/mm/contpte.c
+++ b/mm/contpte.c
@@ -48,6 +48,7 @@
* - pte_clear()
* - ptep_get_and_clear()
* - ptep_test_and_clear_young()
+ * - ptep_clear_flush_young()
*/
pte_t huge_ptep_get(pte_t *ptep)
@@ -729,4 +730,43 @@ __always_inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
return contpte_ptep_test_and_clear_young(vma, addr, ptep);
}
+
+int contpte_ptep_clear_flush_young(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep)
+{
+ int young;
+
+ young = contpte_ptep_test_and_clear_young(vma, addr, ptep);
+
+ if (young) {
+ /*
+ * See comment in __ptep_clear_flush_young(); same rationale for
+ * eliding the trailing DSB applies here.
+ */
+ size_t pgsize;
+ int ncontig;
+
+ ncontig = arch_contpte_get_num_contig(vma->vm_mm, addr, ptep,
+ 0, &pgsize);
+
+ addr = ALIGN_DOWN(addr, ncontig * pgsize);
+ arch_contpte_flush_tlb_range_nosync(vma, addr,
+ addr + ncontig * pgsize,
+ pgsize);
+ }
+
+ return young;
+}
+EXPORT_SYMBOL_GPL(contpte_ptep_clear_flush_young);
+
+__always_inline int ptep_clear_flush_young(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep)
+{
+ pte_t orig_pte = __ptep_get(ptep);
+
+ if (likely(!pte_valid_cont(orig_pte)))
+ return __ptep_clear_flush_young(vma, addr, ptep);
+
+ return contpte_ptep_clear_flush_young(vma, addr, ptep);
+}
#endif /* CONFIG_THP_CONTPTE */
--
2.39.2
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