[PATCH v1 07/14] arm64/mm: ptep_set_wrprotect(): New layer to manage contig bit

From: Ryan Roberts <ryan.roberts@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
	Marc Zyngier <maz@kernel.org>,
	Oliver Upton <oliver.upton@linux.dev>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Alexander Potapenko <glider@google.com>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Matthew Wilcox <willy@infradead.org>, Yu Zhao <yuzhao@google.com>,
	Mark Rutland <mark.rutland@arm.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH v1 07/14] arm64/mm: ptep_set_wrprotect(): New layer to manage contig bit
Date: Thu, 22 Jun 2023 15:42:02 +0100	[thread overview]
Message-ID: <20230622144210.2623299-8-ryan.roberts@arm.com> (raw)
In-Reply-To: <20230622144210.2623299-1-ryan.roberts@arm.com>

Create a new layer for the in-table PTE manipulation APIs. For now, The
existing API is prefixed with double underscore to become the
arch-private API and the public API is just a simple wrapper that calls
the private API.

The public API implementation will subsequently be used to transparently
manipulate the contiguous bit where appropriate. But since there are
already some contig-aware users (e.g. hugetlb, kernel mapper), we must
first ensure those users use the private API directly so that the future
contig-bit manipulations in the public API do not interfere with those
existing uses.

No behavioural changes intended.

Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
---
 arch/arm64/include/asm/pgtable.h | 15 +++++++++++----
 arch/arm64/mm/hugetlbpage.c      |  2 +-
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 450428b11c49..2fcc3b19c873 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -958,11 +958,11 @@ static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
 /*
- * ptep_set_wrprotect - mark read-only while trasferring potential hardware
+ * __ptep_set_wrprotect - mark read-only while trasferring potential hardware
  * dirty status (PTE_DBM && !PTE_RDONLY) to the software PTE_DIRTY bit.
  */
-#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)
 {
 	pte_t old_pte, pte;
 
@@ -980,7 +980,7 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres
 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
 				      unsigned long address, pmd_t *pmdp)
 {
-	ptep_set_wrprotect(mm, address, (pte_t *)pmdp);
+	__ptep_set_wrprotect(mm, address, (pte_t *)pmdp);
 }
 
 #define pmdp_establish pmdp_establish
@@ -1159,6 +1159,13 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
 	return __ptep_clear_flush_young(vma, addr, ptep);
 }
 
+#define __HAVE_ARCH_PTEP_SET_WRPROTECT
+static inline void ptep_set_wrprotect(struct mm_struct *mm,
+				unsigned long addr, pte_t *ptep)
+{
+	__ptep_set_wrprotect(mm, addr, ptep);
+}
+
 #endif /* !__ASSEMBLY__ */
 
 #endif /* __ASM_PGTABLE_H */
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 931a17f3c3fb..7d5eb71db396 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -511,7 +511,7 @@ void huge_ptep_set_wrprotect(struct mm_struct *mm,
 	pte_t pte;
 
 	if (!pte_cont(READ_ONCE(*ptep))) {
-		ptep_set_wrprotect(mm, addr, ptep);
+		__ptep_set_wrprotect(mm, addr, ptep);
 		return;
 	}
 
-- 
2.25.1


