linux-kernel - [RFC PATCH v2 05/21] riscv: mm: Reimplement conversion functions between page table entry

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Message-Id: <20241205103729.14798-6-luxu.kernel@bytedance.com>
Date: Thu,  5 Dec 2024 18:37:13 +0800
From: Xu Lu <luxu.kernel@...edance.com>
To: paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	ardb@...nel.org,
	anup@...infault.org,
	atishp@...shpatra.org
Cc: xieyongji@...edance.com,
	lihangjing@...edance.com,
	punit.agrawal@...edance.com,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	Xu Lu <luxu.kernel@...edance.com>
Subject: [RFC PATCH v2 05/21] riscv: mm: Reimplement conversion functions between page table entry

Some code will convert high level pte into low level pte to reuse pte
functions. For example, pmd_dirty() will convert pmd struct into pte
struct to check whether it is dirty using pte_dirty(). As pte struct at
different level has different constructor now, we can not apply pte
constructor during conversion. Thus, this commit converts ptes by directly
converting structure type.

Signed-off-by: Xu Lu <luxu.kernel@...edance.com>
---
 arch/riscv/include/asm/pgtable.h | 81 ++++++++++++++++++++++++++++++--
 1 file changed, 76 insertions(+), 5 deletions(-)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 1d5f533edbd5..f7b51c52b815 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -309,6 +309,50 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 	return (unsigned long)pfn_to_virt(__page_val_to_pfn(pmd_val(pmd)));
 }
 
+#ifdef CONFIG_RISCV_USE_SW_PAGE
+
+static inline pte_t pmd_pte(pmd_t pmd)
+{
+	return (pte_t)pmd;
+}
+
+static inline pte_t pud_pte(pud_t pud)
+{
+	return (pte_t)pud;
+}
+
+static inline pte_t p4d_pte(p4d_t p4d)
+{
+	return (pte_t)p4d;
+}
+
+static inline pte_t pgd_pte(pgd_t pgd)
+{
+	return (pte_t)pgd;
+}
+
+static inline pmd_t pte_pmd(pte_t pte)
+{
+	return (pmd_t)pte;
+}
+
+static inline pud_t pte_pud(pte_t pte)
+{
+	return (pud_t)pte;
+}
+
+static inline p4d_t pte_p4d(pte_t pte)
+{
+	return (p4d_t)pte;
+}
+
+static inline pgd_t pte_pgd(pte_t pte)
+{
+	return (pgd_t)pte;
+}
+
+#else /* CONFIG_RISCV_USE_SW_PAGE */
+
 static inline pte_t pmd_pte(pmd_t pmd)
 {
 	return __pte(pmd_val(pmd));
@@ -319,6 +363,38 @@ static inline pte_t pud_pte(pud_t pud)
 	return __pte(pud_val(pud));
 }
 
+static inline pte_t p4d_pte(p4d_t p4d)
+{
+	return __pte(p4d_val(p4d));
+}
+
+static inline pte_t pgd_pte(pgd_t pgd)
+{
+	return __pte(pgd_val(pgd));
+}
+
+static inline pmd_t pte_pmd(pte_t pte)
+{
+	return __pmd(pte_val(pte));
+}
+
+static inline pud_t pte_pud(pte_t pte)
+{
+	return __pud(pte_val(pte));
+}
+
+static inline p4d_t pte_p4d(pte_t pte)
+{
+	return __p4d(pte_val(pte));
+}
+
+static inline pgd_t pte_pgd(pte_t pte)
+{
+	return __pgd(pte_val(pte));
+}
+
+#endif /* CONFIG_RISCV_USE_SW_PAGE */
+
 #ifdef CONFIG_RISCV_ISA_SVNAPOT
 #include <asm/cpufeature.h>
 
@@ -728,11 +804,6 @@ static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
 /*
  * THP functions
  */
-static inline pmd_t pte_pmd(pte_t pte)
-{
-	return __pmd(pte_val(pte));
-}
-
 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 {
 	return pmd;
-- 
2.20.1