linux-kernel - [PATCH 3/5] x86: Keep track of direct mapped pfn ranges

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Message-ID: <1344894424-4434-4-git-send-email-jacob.shin@amd.com>
Date:	Mon, 13 Aug 2012 16:47:02 -0500
From:	Jacob Shin <jacob.shin@....com>
To:	X86-ML <x86@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Tejun Heo <tj@...nel.org>,
	Borislav Petkov <borislav.petkov@....com>,
	Jacob Shin <jacob.shin@....com>
Subject: [PATCH 3/5] x86: Keep track of direct mapped pfn ranges

Update later calls to init_memory_mapping to keep track of direct mapped
pfn ranges so that at any point in time we can accurately represent what
memory ranges are direct mapped or not.

Signed-off-by: Jacob Shin <jacob.shin@....com>
---
 arch/x86/kernel/amd_gart_64.c  |    4 +++-
 arch/x86/mm/init_64.c          |    3 +--
 arch/x86/platform/efi/efi_64.c |    2 ++
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index e663112..5ac26b9 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c
@@ -770,7 +770,9 @@ int __init gart_iommu_init(void)
 
 	if (end_pfn > max_low_pfn_mapped) {
 		start_pfn = (aper_base>>PAGE_SHIFT);
-		init_memory_mapping(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT);
+		end_pfn = init_memory_mapping(start_pfn<<PAGE_SHIFT,
+					      end_pfn<<PAGE_SHIFT);
+		add_pfn_range_mapped(start_pfn, end_pfn);
 	}
 
 	pr_info("PCI-DMA: using GART IOMMU.\n");
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 2b6b4a3..cbed965 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -662,8 +662,7 @@ int arch_add_memory(int nid, u64 start, u64 size)
 	int ret;
 
 	last_mapped_pfn = init_memory_mapping(start, start + size);
-	if (last_mapped_pfn > max_pfn_mapped)
-		max_pfn_mapped = last_mapped_pfn;
+	add_pfn_range_mapped(start_pfn, last_mapped_pfn);
 
 	ret = __add_pages(nid, zone, start_pfn, nr_pages);
 	WARN_ON_ONCE(ret);
diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index ac3aa54..e822c89 100644
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -90,6 +90,8 @@ void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
 		return ioremap(phys_addr, size);
 
 	last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
+	add_pfn_range_mapped(phys_addr >> PAGE_SHIFT, last_map_pfn);
+
 	if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
 		unsigned long top = last_map_pfn << PAGE_SHIFT;
 		efi_ioremap(top, size - (top - phys_addr), type);
-- 
1.7.9.5


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