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    SubjectRe: [BUG 2.6.31-rc1] HIGHMEM64G causes hang in PCI init on 32-bit x86
    Mikael Pettersson writes:
    > The combination of HIGHMEM64G and PCI doesn't work in 2.6.31-rc1,
    > causing a hang in PCI initialisation during boot:
    >
    > Linux version 2.6.31-rc1 (mikpe@brewer) (gcc version 4.3.4 20090621 (prerelease) (GCC) ) #1 Fri Jun 26 16:01:50 CEST 2009
    > KERNEL supported cpus:
    > Intel GenuineIntel
    > BIOS-provided physical RAM map:
    > BIOS-e820: 0000000000000000 - 000000000009ec00 (usable)
    > BIOS-e820: 000000000009ec00 - 00000000000a0000 (reserved)
    > BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved)
    > BIOS-e820: 0000000000100000 - 000000007ff90000 (usable)
    > BIOS-e820: 000000007ff90000 - 000000007ff9e000 (ACPI data)
    > BIOS-e820: 000000007ff9e000 - 000000007ffe0000 (ACPI NVS)
    > BIOS-e820: 000000007ffe0000 - 0000000080000000 (reserved)
    > BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
    > BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
    > BIOS-e820: 0000000100000000 - 0000000200000000 (usable)
    > DMI 2.4 present.
    > last_pfn = 0x200000 max_arch_pfn = 0x1000000
    > init_memory_mapping: 0000000000000000-00000000379fe000
    > NX (Execute Disable) protection: active
    > RAMDISK: 37ebb000 - 37fef7c6
    > Allocated new RAMDISK: 00221000 - 003557c6
    > Move RAMDISK from 0000000037ebb000 - 0000000037fef7c5 to 00221000 - 003557c5
    > 7302MB HIGHMEM available.
    > 889MB LOWMEM available.
    > mapped low ram: 0 - 379fe000
    > low ram: 0 - 379fe000
    > node 0 low ram: 00000000 - 379fe000
    > node 0 bootmap 00009000 - 0000ff40
    > (7 early reservations) ==> bootmem [0000000000 - 00379fe000]
    > #0 [0000000000 - 0000001000] BIOS data page ==> [0000000000 - 0000001000]
    > #1 [0000100000 - 000021cf18] TEXT DATA BSS ==> [0000100000 - 000021cf18]
    > #2 [000009ec00 - 0000100000] BIOS reserved ==> [000009ec00 - 0000100000]
    > #3 [000021d000 - 000022022c] BRK ==> [000021d000 - 000022022c]
    > #4 [0000007000 - 0000009000] PGTABLE ==> [0000007000 - 0000009000]
    > #5 [0000221000 - 00003557c6] NEW RAMDISK ==> [0000221000 - 00003557c6]
    > #6 [0000009000 - 0000010000] BOOTMAP ==> [0000009000 - 0000010000]
    > Zone PFN ranges:
    > DMA 0x00000000 -> 0x00001000
    > Normal 0x00001000 -> 0x000379fe
    > HighMem 0x000379fe -> 0x00200000
    > Movable zone start PFN for each node
    > early_node_map[3] active PFN ranges
    > 0: 0x00000000 -> 0x0000009e
    > 0: 0x00000100 -> 0x0007ff90
    > 0: 0x00100000 -> 0x00200000
    > Allocating PCI resources starting at 80000000 (gap: 80000000:7ee00000)
    > Built 1 zonelists in Zone order, mobility grouping on. Total pages: 1556269
    > Kernel command line: ro root=LABEL=32/ console=ttyS0,115200
    > PID hash table entries: 4096 (order: 12, 16384 bytes)
    > Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
    > Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
    > Enabling fast FPU save and restore... done.
    > Enabling unmasked SIMD FPU exception support... done.
    > Initializing CPU#0
    > Initializing HighMem for node 0 (000379fe:00200000)
    > Memory: 6220996k/8388608k available (691k kernel code, 68768k reserved, 203k data, 144k init, 5379656k highmem)
    > virtual kernel memory layout:
    > fixmap : 0xfffe6000 - 0xfffff000 ( 100 kB)
    > pkmap : 0xffa00000 - 0xffc00000 (2048 kB)
    > vmalloc : 0xf81fe000 - 0xff9fe000 ( 120 MB)
    > lowmem : 0xc0000000 - 0xf79fe000 ( 889 MB)
    > .init : 0xc01e2000 - 0xc0206000 ( 144 kB)
    > .data : 0xc01acd86 - 0xc01dfbdc ( 203 kB)
    > .text : 0xc0100000 - 0xc01acd86 ( 691 kB)
    > Checking if this processor honours the WP bit even in supervisor mode...Ok.
    > NR_IRQS:16
    > Fast TSC calibration using PIT
    > Detected 2400.277 MHz processor.
    > Console: colour VGA+ 80x25
    > console [ttyS0] enabled
    > Calibrating delay loop (skipped), value calculated using timer frequency.. 4800.55 BogoMIPS (lpj=24002770)
    > Mount-cache hash table entries: 512
    > CPU: L1 I cache: 32K, L1 D cache: 32K
    > CPU: L2 cache: 4096K
    > using mwait in idle threads.
    > CPU: Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz stepping 06
    > Checking 'hlt' instruction... OK.
    > PCI: PCI BIOS revision 3.00 entry at 0xf0031, last bus=2
    > PCI: Using configuration type 1 for base access
    > PCI: Probing PCI hardware
    > pci 0000:00:01.0: PME# supported from D0 D3hot D3cold
    > pci 0000:00:01.0: PME# disabled
    > pci 0000:00:1a.7: PME# supported from D0 D3hot D3cold
    > pci 0000:00:1a.7: PME# disabled
    > pci 0000:00:1b.0: PME# supported from D0 D3hot D3cold
    > pci 0000:00:1b.0: PME# disabled
    > pci 0000:00:1d.7: PME# supported from D0 D3hot D3cold
    > pci 0000:00:1d.7: PME# disabled
    > pci 0000:00:1f.0: quirk: region 0800-087f claimed by ICH6 ACPI/GPIO/TCO
    > pci 0000:00:1f.0: quirk: region 0480-04bf claimed by ICH6 GPIO
    > pci 0000:00:1f.0: ICH7 LPC Generic IO decode 1 PIO at 0294 (mask 0003)
    > pci 0000:00:1f.2: PME# supported from D3hot
    > pci 0000:00:1f.2: PME# disabled
    > pci 0000:02:02.0: PME# supported from D1 D2 D3hot D3cold
    > pci 0000:02:02.0: PME# disabled
    > pci 0000:00:1e.0: transparent bridge
    > pci 0000:00:1f.0: PIIX/ICH IRQ router [8086:2810]
    >
    > At this point the kernel hangs hard until rebooted.
    >
    > Rebooting with mem=2048M (to avoid issues with mappings >= 4GB)
    > allows PCI init to proceed and print:
    >
    > pci 0000:00:01.0: PCI bridge, secondary bus 0000:01
    > pci 0000:00:01.0: IO window: 0x9000-0xbfff
    > pci 0000:00:01.0: MEM window: 0xff800000-0xff8fffff
    > pci 0000:00:01.0: PREFETCH window: 0x000000bff00000-0x000000dfefffff
    > pci 0000:00:1e.0: PCI bridge, secondary bus 0000:02
    > pci 0000:00:1e.0: IO window: 0xc000-0xcfff
    > pci 0000:00:1e.0: MEM window: 0xff900000-0xff9fffff
    > pci 0000:00:1e.0: PREFETCH window: disabled
    > pci 0000:00:01.0: found PCI INT A -> IRQ 11
    > pci 0000:00:01.0: sharing IRQ 11 with 0000:00:1a.0
    > pci 0000:00:01.0: sharing IRQ 11 with 0000:01:00.0
    > Unpacking initramfs...
    > Freeing initrd memory: 1233k freed
    > platform rtc_cmos: registered platform RTC device (no PNP device found)
    > Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
    > serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
    > Platform driver 'serial8250' needs updating - please use dev_pm_ops
    > Freeing unused kernel memory: 144k freed
    > Red Hat nash version 5.1.19.0.3 starting
    > ...
    >
    > Booting with pci=off also allows the kernel to boot.
    > Reconfiguring with NOHIGHMEM or HIGHMEM4G also allows the kernel to boot.
    >
    > This is a regression from 2.6.30 and earlier kernels.

    I've now identified commit 95ee14e4379c5e19c0897c872350570402014742
    "x86: cap iomem_resource to addressable physical memory" by hpa (cc:d)
    as the culprit. Reverting it fixes my boot hang.

    That commit was:

    > x86: cap iomem_resource to addressable physical memory
    >
    > iomem_resource is by default initialized to -1, which means 64 bits of
    > physical address space if 64-bit resources are enabled. However, x86
    > CPUs cannot address 64 bits of physical address space. Thus, we want
    > to cap the physical address space to what the union of all CPU can
    > actually address.
    >
    > Without this patch, we may end up assigning inaccessible values to
    > uninitialized 64-bit PCI memory resources.
    >
    > Signed-off-by: H. Peter Anvin <hpa@zytor.com>
    > Cc: Matthew Wilcox <matthew@wil.cx>
    > Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
    > Cc: Martin Mares <mj@ucw.cz>
    > Cc: stable@kernel.org
    > ---
    >
    > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
    > index 3ffdcfa..5b9cb88 100644
    > --- a/arch/x86/kernel/cpu/common.c
    > +++ b/arch/x86/kernel/cpu/common.c
    > @@ -853,6 +853,9 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
    > #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
    > numa_add_cpu(smp_processor_id());
    > #endif
    > +
    > + /* Cap the iomem address space to what is addressable on all CPUs */
    > + iomem_resource.end &= (1ULL << c->x86_phys_bits) - 1;
    > }
    >
    > #ifdef CONFIG_X86_64


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