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Yinghai Lu 7ab073b6e0 x86: max_low_pfn_mapped fix, #1 
fix crash on Ingo's big box:

calling  pci_iommu_init+0x0/0x17
PCI-DMA: Disabling AGP.
PCI-DMA: aperture base @ d0000000 size 65536 KB
PCI-DMA: using GART IOMMU.
PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture
BUG: unable to handle kernel paging request at ffff88000003be88
IP: [<ffffffff8026d377>] __alloc_pages_internal+0xc3/0x3f2
PGD 202063 PUD 206063 PMD 22fc00163 PTE 3b162
Oops: 0000 [1] SMP

and e820 is:

 BIOS-e820: 0000000000000000 - 000000000009ac00 (usable)
 BIOS-e820: 000000000009ac00 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000ca000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 000000007ff70000 (usable)
 BIOS-e820: 000000007ff70000 - 000000007ff86000 (ACPI data)
 BIOS-e820: 000000007ff86000 - 0000000080000000 (ACPI NVS)
 BIOS-e820: 0000000080000000 - 00000000cfe00000 (usable)
 BIOS-e820: 00000000cfe00000 - 00000000d0000000 (reserved)
 BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
 BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
 BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
 BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved)
 BIOS-e820: 0000000100000000 - 0000000830000000 (usable)

system has 32 GB RAM installed.

max_low_pfn_mapped is 0xcfe00, and GART aperture is not mapped.

So try to use init_memory_mapping to map that area, because the iommu
thinks that area is ram ...

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 		2008-07-13 08:19:15 +02:00
..
boot Merge branch 'x86/mpparse' into x86/devel 2008-07-08 11:14:58 +02:00
configs x86: defconfig updates 2008-05-12 21:28:12 +02:00
crypto [CRYPTO] aes-x86-32: Remove unused return code 2008-04-21 10:19:21 +08:00
ia32 x86: rename threadinfo to TI. 2008-07-09 09:14:02 +02:00
kernel x86: max_low_pfn_mapped fix, #1 2008-07-13 08:19:15 +02:00
kvm KVM: Make kvm host use the paravirt clocksource structs 2008-06-24 21:02:32 +03:00
lguest x86, VisWS: turn into generic arch, eliminate Kconfig specials 2008-07-10 18:55:47 +02:00
lib x86: fix compile error in current tip.git 2008-07-10 21:55:59 +02:00
mach-default x86, VisWS: turn into generic arch, eliminate Kconfig specials 2008-07-10 18:55:47 +02:00
mach-es7000 x86: make generic arch support NUMAQ 2008-06-10 11:34:42 +02:00
mach-generic x86: make generic arch support NUMAQ, fix 2008-07-08 10:35:45 +02:00
mach-rdc321x x86, rdc321x: remove watchdog file 2008-04-17 17:40:50 +02:00
mach-voyager x86: cleanup machine_specific_memory_setup, v2 2008-07-08 10:39:01 +02:00
math-emu x86: coding style fixes to arch/x86/math-emu/reg_constant 2008-06-18 15:00:13 +02:00
mm Merge branch 'linus' into x86/core 2008-07-12 07:29:02 +02:00
oprofile x86/oprofile: disable preemption in nmi_shutdown 2008-06-24 13:48:29 +02:00
pci Merge branch 'x86/generalize-visws' into x86/core 2008-07-11 21:22:18 +02:00
power x86: remove end_pfn in 64bit 2008-07-08 13:10:38 +02:00
vdso x86_64: vdso32 cleanup using feature flags 2008-07-11 15:44:58 +02:00
video x86: video/fbdev.c: add MODULE_LICENSE 2008-05-04 20:04:46 +02:00
xen x86: rename paravirtualized TSC functions 2008-07-09 07:43:28 +02:00
Kconfig x86, VisWS: fix pci_direct_conf1 dependency 2008-07-10 20:10:48 +02:00
Kconfig.cpu x86: mark x86_64 as having a working WP. 2008-07-09 09:14:21 +02:00
Kconfig.debug Merge branch 'x86/numa' into x86/devel 2008-07-08 11:59:23 +02:00
Makefile x86, VisWS: turn into generic arch, remove leftover files 2008-07-10 18:55:45 +02:00
Makefile_32.cpu x86: move i386 and x86_64 Makefiles to arch/x86 2007-10-25 22:27:34 +02:00