The patch titled
PCI MMConfig: Only map what's necessary.
has been added to the -mm tree. Its filename is
pci-mmconfig-only-map-whats-necessary.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: PCI MMConfig: Only map what's necessary.
From: Olivier Galibert <galibert@xxxxxxxxx>
The x86-64 mmconfig code always map a range of MMCONFIG_APER_MAX bytes, i.e.
256MB, whatever the number of accessible busses is. Fix it, and add the end
of the zone in the printk while we're at it.
Signed-off-by: Olivier Galibert <galibert@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/x86_64/pci/mmconfig.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
diff -puN arch/x86_64/pci/mmconfig.c~pci-mmconfig-only-map-whats-necessary arch/x86_64/pci/mmconfig.c
--- a/arch/x86_64/pci/mmconfig.c~pci-mmconfig-only-map-whats-necessary
+++ a/arch/x86_64/pci/mmconfig.c
@@ -13,10 +13,6 @@
#include "pci.h"
-/* aperture is up to 256MB but BIOS may reserve less */
-#define MMCONFIG_APER_MIN (2 * 1024*1024)
-#define MMCONFIG_APER_MAX (256 * 1024*1024)
-
/* Verify the first 16 busses. We assume that systems with more busses
get MCFG right. */
#define PCI_MMCFG_MAX_CHECK_BUS 16
@@ -143,17 +139,19 @@ int __init pci_mmcfg_arch_init(void)
}
for (i = 0; i < pci_mmcfg_config_num; ++i) {
+ u32 size = (pci_mmcfg_config[0].end_bus_number - pci_mmcfg_config[0].start_bus_number + 1) << 20;
pci_mmcfg_virt[i].cfg = &pci_mmcfg_config[i];
pci_mmcfg_virt[i].virt = ioremap_nocache(pci_mmcfg_config[i].base_address,
- MMCONFIG_APER_MAX);
+ size);
if (!pci_mmcfg_virt[i].virt) {
printk(KERN_ERR "PCI: Cannot map mmconfig aperture for "
"segment %d\n",
pci_mmcfg_config[i].pci_segment_group_number);
return 0;
}
- printk(KERN_INFO "PCI: Using MMCONFIG at %x\n",
- pci_mmcfg_config[i].base_address);
+ printk(KERN_INFO "PCI: Using MMCONFIG at %x-%x\n",
+ pci_mmcfg_config[i].base_address,
+ pci_mmcfg_config[i].base_address + size - 1);
}
raw_pci_ops = &pci_mmcfg;
_
Patches currently in -mm which might be from galibert@xxxxxxxxx are
pci-mmconfig-share-whats-shareable.patch
pci-mmconfig-only-call-unreachable_devices-when-type-1-is-available.patch
pci-mmconfig-only-map-whats-necessary.patch
pci-mmconfig-detect-and-support-the-e7520-and-the-945g-gz-p-pl.patch
pci-mmconfig-reserve-resources-but-only-when-were-sure-about-them.patch
-
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