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Date: Fri, 26 Jun 2009 21:53:21 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: Mikael Pettersson <mikpe@...uu.se> CC: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org Subject: Re: [BUG 2.6.31-rc1] HIGHMEM64G causes hang in PCI init on 32-bit x86 Can you send me /proc/cpuinfo and /proc/iomem from this box? -hpa Mikael Pettersson wrote: > 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@...wer) (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@...or.com> >> Cc: Matthew Wilcox <matthew@....cx> >> Cc: Jesse Barnes <jbarnes@...tuousgeek.org> >> Cc: Martin Mares <mj@....cz> >> Cc: stable@...nel.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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