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Subject[PATCH] [6/26] x86: fix amd64-agp aperture validation
Date

From: "Jan Beulich" <jbeulich@novell.com>
Under CONFIG_DISCONTIGMEM, assuming that a !pfn_valid() implies all
subsequent pfn-s are also invalid is wrong. Thus replace this by
explicitly checking against the E820 map.

AK: make e820 on x86-64 not initdata

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Mark Langsdorf <mark.langsdorf@amd.com>

---
arch/i386/kernel/e820.c | 20 ++++++++++++++++++++
arch/x86_64/kernel/e820.c | 5 +++--
drivers/char/agp/amd64-agp.c | 13 ++++---------
include/asm-i386/e820.h | 1 +
4 files changed, 28 insertions(+), 11 deletions(-)
Index: linux/arch/i386/kernel/e820.c
===================================================================
--- linux.orig/arch/i386/kernel/e820.c
+++ linux/arch/i386/kernel/e820.c
@@ -825,6 +825,26 @@ void __init limit_regions(unsigned long
print_memory_map("limit_regions endfunc");
}

+/*
+ * This function checks if any part of the range <start,end> is mapped
+ * with type.
+ */
+int
+e820_any_mapped(u64 start, u64 end, unsigned type)
+{
+ int i;
+ for (i = 0; i < e820.nr_map; i++) {
+ const struct e820entry *ei = &e820.map[i];
+ if (type && ei->type != type)
+ continue;
+ if (ei->addr >= end || ei->addr + ei->size <= start)
+ continue;
+ return 1;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(e820_any_mapped);
+
/*
* This function checks if the entire range <start,end> is mapped with type.
*
Index: linux/arch/x86_64/kernel/e820.c
===================================================================
--- linux.orig/arch/x86_64/kernel/e820.c
+++ linux/arch/x86_64/kernel/e820.c
@@ -25,7 +25,7 @@
#include <asm/bootsetup.h>
#include <asm/sections.h>

-struct e820map e820 __initdata;
+struct e820map e820;

/*
* PFN of last memory page.
@@ -98,7 +98,7 @@ static inline int bad_addr(unsigned long
* This function checks if any part of the range <start,end> is mapped
* with type.
*/
-int __meminit
+int
e820_any_mapped(unsigned long start, unsigned long end, unsigned type)
{
int i;
@@ -112,6 +112,7 @@ e820_any_mapped(unsigned long start, uns
}
return 0;
}
+EXPORT_SYMBOL_GPL(e820_any_mapped);

/*
* This function checks if the entire range <start,end> is mapped with type.
Index: linux/drivers/char/agp/amd64-agp.c
===================================================================
--- linux.orig/drivers/char/agp/amd64-agp.c
+++ linux/drivers/char/agp/amd64-agp.c
@@ -14,6 +14,7 @@
#include <linux/agp_backend.h>
#include <linux/mmzone.h>
#include <asm/page.h> /* PAGE_SIZE */
+#include <asm/e820.h>
#include <asm/k8.h>
#include "agp.h"

@@ -259,7 +260,6 @@ static const struct agp_bridge_driver am
/* Some basic sanity checks for the aperture. */
static int __devinit aperture_valid(u64 aper, u32 size)
{
- u32 pfn, c;
if (aper == 0) {
printk(KERN_ERR PFX "No aperture\n");
return 0;
@@ -272,14 +272,9 @@ static int __devinit aperture_valid(u64
printk(KERN_ERR PFX "Aperture out of bounds\n");
return 0;
}
- pfn = aper >> PAGE_SHIFT;
- for (c = 0; c < size/PAGE_SIZE; c++) {
- if (!pfn_valid(pfn + c))
- break;
- if (!PageReserved(pfn_to_page(pfn + c))) {
- printk(KERN_ERR PFX "Aperture pointing to RAM\n");
- return 0;
- }
+ if (e820_any_mapped(aper, aper + size, E820_RAM)) {
+ printk(KERN_ERR PFX "Aperture pointing to RAM\n");
+ return 0;
}

/* Request the Aperture. This catches cases when someone else
Index: linux/include/asm-i386/e820.h
===================================================================
--- linux.orig/include/asm-i386/e820.h
+++ linux/include/asm-i386/e820.h
@@ -38,6 +38,7 @@ extern struct e820map e820;

extern int e820_all_mapped(unsigned long start, unsigned long end,
unsigned type);
+extern int e820_any_mapped(u64 start, u64 end, unsigned type);
extern void find_max_pfn(void);
extern void register_bootmem_low_pages(unsigned long max_low_pfn);
extern void e820_register_memory(void);
-
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