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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>
Subject: [PATCH 2/3] RISC-V: mm: Enable huge page support to kernel_page_present() function
Date:   Fri, 6 Jan 2023 14:05:34 +0800
Message-ID: <20230106060535.104321-3-jeeheng.sia@starfivetech.com>
In-Reply-To: <20230106060535.104321-1-jeeheng.sia@starfivetech.com>
References: <20230106060535.104321-1-jeeheng.sia@starfivetech.com>
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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.

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>
---
 arch/riscv/mm/pageattr.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c
index 86c56616e5de..fb59d494d708 100644
--- a/arch/riscv/mm/pageattr.c
+++ b/arch/riscv/mm/pageattr.c
@@ -221,14 +221,20 @@ bool kernel_page_present(struct page *page)
 	p4d = p4d_offset(pgd, addr);
 	if (!p4d_present(*p4d))
 		return false;
+	if (pgtable_l5_enabled && p4d_leaf(*pud))
+		return true;
 
 	pud = pud_offset(p4d, addr);
 	if (!pud_present(*pud))
 		return false;
+	if (pgtable_l4_enabled && 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