From:   Sia Jee Heng <jeeheng.sia@starfivetech.com>
To:     <paul.walmsley@sifive.com>, <palmer@dabbelt.com>,
        <aou@eecs.berkeley.edu>
CC:     <linux-riscv@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
        <jeeheng.sia@starfivetech.com>, <leyfoon.tan@starfivetech.com>,
        <mason.huo@starfivetech.com>,
        Andrew Jones <ajones@ventanamicro.com>,
        Alexandre Ghiti <alexghiti@rivosinc.com>
Subject: [PATCH v6 3/4] RISC-V: mm: Enable huge page support to kernel_page_present() function
Date:   Tue, 14 Mar 2023 13:03:15 +0800
Message-ID: <20230314050316.31701-4-jeeheng.sia@starfivetech.com>
In-Reply-To: <20230314050316.31701-1-jeeheng.sia@starfivetech.com>
References: <20230314050316.31701-1-jeeheng.sia@starfivetech.com>
MIME-Version: 1.0
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Precedence: bulk

Currently kernel_page_present() function doesn't support huge page
detection causes the function to mistakenly return false to the
hibernation core.

Add huge page detection to the function to solve the problem.

Fixes: 9e953cda5cdf ("riscv: Introduce huge page support for 32/64bit kernel")
Signed-off-by: Sia Jee Heng <jeeheng.sia@starfivetech.com>
Reviewed-by: Ley Foon Tan <leyfoon.tan@starfivetech.com>
Reviewed-by: Mason Huo <mason.huo@starfivetech.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
---
 arch/riscv/mm/pageattr.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c
index 86c56616e5de..ea3d61de065b 100644
--- a/arch/riscv/mm/pageattr.c
+++ b/arch/riscv/mm/pageattr.c
@@ -217,18 +217,26 @@ bool kernel_page_present(struct page *page)
 	pgd = pgd_offset_k(addr);
 	if (!pgd_present(*pgd))
 		return false;
+	if (pgd_leaf(*pgd))
+		return true;
 
 	p4d = p4d_offset(pgd, addr);
 	if (!p4d_present(*p4d))
 		return false;
+	if (p4d_leaf(*p4d))
+		return true;
 
 	pud = pud_offset(p4d, addr);
 	if (!pud_present(*pud))
 		return false;
+	if (pud_leaf(*pud))
+		return true;
 
 	pmd = pmd_offset(pud, addr);
 	if (!pmd_present(*pmd))
 		return false;
+	if (pmd_leaf(*pmd))
+		return true;
 
 	pte = pte_offset_kernel(pmd, addr);
 	return pte_present(*pte);
-- 
2.34.1