linux-kernel - [PATCH 03/11] x86/e820: Set IORESOURCE_SYSTEM

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Date:	Mon, 14 Dec 2015 16:37:18 -0700
From:	Toshi Kani <toshi.kani@....com>
To:	akpm@...ux-foundation.org, bp@...en8.de
Cc:	linux-arch@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Toshi Kani <toshi.kani@....com>
Subject: [PATCH 03/11] x86/e820: Set IORESOURCE_SYSTEM_RAM to System RAM

Change e820_reserve_resources() to set IORESOURCE_SYSTEM_RAM for
E820_RESERVED_KERN and E820_RAM, which are set to "System RAM".

Also set IORESOURCE_SYSTEM_RAM to "Kernel data", "Kernel code",
and "Kernel bss", which are children nodes of System RAM.

Cc: Borislav Petkov <bp@...en8.de>
Cc: x86@...nel.org
Signed-off-by: Toshi Kani <toshi.kani@....com>
---
 arch/x86/kernel/e820.c  |   18 +++++++++++++++++-
 arch/x86/kernel/setup.c |    6 +++---
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 569c1e4..4c8bcbc 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -925,6 +925,22 @@ static const char *e820_type_to_string(int e820_type)
 	}
 }
 
+static int e820_type_to_iomem_type(int e820_type)
+{
+	switch (e820_type) {
+	case E820_RESERVED_KERN:
+	case E820_RAM:
+		return IORESOURCE_SYSTEM_RAM;
+	case E820_ACPI:
+	case E820_NVS:
+	case E820_UNUSABLE:
+	case E820_PRAM:
+	case E820_PMEM:
+	default:
+		return IORESOURCE_MEM;
+	}
+}
+
 static bool do_mark_busy(u32 type, struct resource *res)
 {
 	/* this is the legacy bios/dos rom-shadow + mmio region */
@@ -967,7 +983,7 @@ void __init e820_reserve_resources(void)
 		res->start = e820.map[i].addr;
 		res->end = end;
 
-		res->flags = IORESOURCE_MEM;
+		res->flags = e820_type_to_iomem_type(e820.map[i].type);
 
 		/*
 		 * don't register the region that could be conflicted with
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index d2bbe34..a492c30 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -152,21 +152,21 @@ static struct resource data_resource = {
 	.name	= "Kernel data",
 	.start	= 0,
 	.end	= 0,
-	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
+	.flags	= IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
 };
 
 static struct resource code_resource = {
 	.name	= "Kernel code",
 	.start	= 0,
 	.end	= 0,
-	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
+	.flags	= IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
 };
 
 static struct resource bss_resource = {
 	.name	= "Kernel bss",
 	.start	= 0,
 	.end	= 0,
-	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
+	.flags	= IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
 };
 
 
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