linux-kernel - [External] [RFC PATCH v1 6/6] arch/x86/mm: create page table mapping for DRAM and NVDIMM both

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Message-ID: <HK2PR03MB1684101846A9D9639BE00001929A0@HK2PR03MB1684.apcprd03.prod.outlook.com>
Date:   Tue, 8 May 2018 02:35:13 +0000
From:   Huaisheng HS1 Ye <yehs1@...ovo.com>
To:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
CC:     "mhocko@...e.com" <mhocko@...e.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "vbabka@...e.cz" <vbabka@...e.cz>,
        "mgorman@...hsingularity.net" <mgorman@...hsingularity.net>,
        "pasha.tatashin@...cle.com" <pasha.tatashin@...cle.com>,
        "alexander.levin@...izon.com" <alexander.levin@...izon.com>,
        "hannes@...xchg.org" <hannes@...xchg.org>,
        "penguin-kernel@...ove.SAKURA.ne.jp" 
        <penguin-kernel@...ove.SAKURA.ne.jp>,
        "colyli@...e.de" <colyli@...e.de>,
        NingTing Cheng <chengnt@...ovo.com>,
        "Ocean HY1 He" <hehy1@...ovo.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>
Subject: [External]  [RFC PATCH v1 6/6] arch/x86/mm: create page table mapping
 for DRAM and NVDIMM both

Create PTE, PMD, PUD and P4D levels page table mapping for physical
addresses of DRAM and NVDIMM both. Here E820_TYPE_PMEM represents
the region of e820_table.

Signed-off-by: Huaisheng Ye <yehs1@...ovo.com>
Signed-off-by: Ocean He <hehy1@...ovo.com>
---
 arch/x86/mm/init_64.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index af11a28..c03c2091 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -420,6 +420,10 @@ void __init cleanup_highmap(void)
 			if (!after_bootmem &&
 			    !e820__mapped_any(paddr & PAGE_MASK, paddr_next,
 					     E820_TYPE_RAM) &&
+#ifdef CONFIG_ZONE_NVM
+			    !e820__mapped_any(paddr & PAGE_MASK, paddr_next,
+					     E820_TYPE_PMEM) &&
+#endif
 			    !e820__mapped_any(paddr & PAGE_MASK, paddr_next,
 					     E820_TYPE_RESERVED_KERN))
 				set_pte(pte, __pte(0));
@@ -475,6 +479,10 @@ void __init cleanup_highmap(void)
 			if (!after_bootmem &&
 			    !e820__mapped_any(paddr & PMD_MASK, paddr_next,
 					     E820_TYPE_RAM) &&
+#ifdef CONFIG_ZONE_NVM
+			    !e820__mapped_any(paddr & PAGE_MASK, paddr_next,
+					     E820_TYPE_PMEM) &&
+#endif
 			    !e820__mapped_any(paddr & PMD_MASK, paddr_next,
 					     E820_TYPE_RESERVED_KERN))
 				set_pmd(pmd, __pmd(0));
@@ -561,6 +569,10 @@ void __init cleanup_highmap(void)
 			if (!after_bootmem &&
 			    !e820__mapped_any(paddr & PUD_MASK, paddr_next,
 					     E820_TYPE_RAM) &&
+#ifdef CONFIG_ZONE_NVM
+			    !e820__mapped_any(paddr & PAGE_MASK, paddr_next,
+					     E820_TYPE_PMEM) &&
+#endif
 			    !e820__mapped_any(paddr & PUD_MASK, paddr_next,
 					     E820_TYPE_RESERVED_KERN))
 				set_pud(pud, __pud(0));
@@ -647,6 +659,10 @@ void __init cleanup_highmap(void)
 			if (!after_bootmem &&
 			    !e820__mapped_any(paddr & P4D_MASK, paddr_next,
 					     E820_TYPE_RAM) &&
+#ifdef CONFIG_ZONE_NVM
+			    !e820__mapped_any(paddr & PAGE_MASK, paddr_next,
+					     E820_TYPE_PMEM) &&
+#endif
 			    !e820__mapped_any(paddr & P4D_MASK, paddr_next,
 					     E820_TYPE_RESERVED_KERN))
 				set_p4d(p4d, __p4d(0));
-- 
1.8.3.1