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authorAndi Kleen <ak@suse.de>2006-08-30 19:37:06 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-08-30 16:05:15 -0700
commit11012d419cfc0e0f78ca356aca03674217910124 (patch)
tree6013f84adb892155d7141f3e996a52ab13b7669f /arch/x86_64
parentddcf36511d213501a035f168334046ba30a61a11 (diff)
[PATCH] x86: Revert e820 MCFG heuristics
The check for the MCFG table being reserved in the e820 map was originally added to detect a broken BIOS in a preproduction Intel SDV. However it also breaks the Apple x86 Macs, which can't supply this properly, but need a working MCFG. With this patch they wouldn't use the MCFG and not work. After some discussion I think it's best to remove the heuristic again. It also failed on some other boxes (although it didn't cause much problems there because old style port access for PCI config space still works as fallback), but the preproduction SDVs can just use pci=nommcfg. Supporting production machines properly is more important. Edgar Hucek did all the debugging work. Cc: Arjan van de Ven <arjan@infradead.org> Cc: Edgar Hucek <hostmaster@ed-soft.at> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/kernel/e820.c29
-rw-r--r--arch/x86_64/pci/mmconfig.c9
2 files changed, 0 insertions, 38 deletions
diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
index e56c2adf57a..d81e3d6dd24 100644
--- a/arch/x86_64/kernel/e820.c
+++ b/arch/x86_64/kernel/e820.c
@@ -104,35 +104,6 @@ e820_any_mapped(unsigned long start, unsigned long end, unsigned type)
return 0;
}
-/*
- * This function checks if the entire range <start,end> is mapped with type.
- *
- * Note: this function only works correct if the e820 table is sorted and
- * not-overlapping, which is the case
- */
-int __init e820_all_mapped(unsigned long start, unsigned long end, unsigned type)
-{
- int i;
- for (i = 0; i < e820.nr_map; i++) {
- struct e820entry *ei = &e820.map[i];
- if (type && ei->type != type)
- continue;
- /* is the region (part) in overlap with the current region ?*/
- if (ei->addr >= end || ei->addr + ei->size <= start)
- continue;
-
- /* if the region is at the beginning of <start,end> we move
- * start to the end of the region since it's ok until there
- */
- if (ei->addr <= start)
- start = ei->addr + ei->size;
- /* if start is now at or beyond end, we're done, full coverage */
- if (start >= end)
- return 1; /* we're done */
- }
- return 0;
-}
-
/*
* Find a free area in a specific range.
*/
diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c
index 3c55c76c6fd..8a4a0f9263c 100644
--- a/arch/x86_64/pci/mmconfig.c
+++ b/arch/x86_64/pci/mmconfig.c
@@ -177,15 +177,6 @@ void __init pci_mmcfg_init(void)
(pci_mmcfg_config[0].base_address == 0))
return;
- if (!e820_all_mapped(pci_mmcfg_config[0].base_address,
- pci_mmcfg_config[0].base_address + MMCONFIG_APER_MIN,
- E820_RESERVED)) {
- printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %x is not E820-reserved\n",
- pci_mmcfg_config[0].base_address);
- printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
- return;
- }
-
/* RED-PEN i386 doesn't do _nocache right now */
pci_mmcfg_virt = kmalloc(sizeof(*pci_mmcfg_virt) * pci_mmcfg_config_num, GFP_KERNEL);
if (pci_mmcfg_virt == NULL) {