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    SubjectRe: [tip:x86/apic] x86: read apic ID in the !acpi_lapic case
    Ingo Molnar wrote:
    > * tip-bot for Yinghai Lu <yinghai@kernel.org> wrote:
    >
    >> Commit-ID: 4401da6111ac58f94234417427d06a72c4048c74
    >> Gitweb: http://git.kernel.org/tip/4401da6111ac58f94234417427d06a72c4048c74
    >> Author: Yinghai Lu <yinghai@kernel.org>
    >> AuthorDate: Sat, 2 May 2009 10:40:57 -0700
    >> Committer: Ingo Molnar <mingo@elte.hu>
    >> CommitDate: Mon, 11 May 2009 11:29:23 +0200
    >>
    >> x86: read apic ID in the !acpi_lapic case
    >>
    >> Ed found that on 32-bit, boot_cpu_physical_apicid is not read right,
    >> when the mptable is broken.
    >
    > -tip testing found that this patch causes a kernel crash:
    >
    > [ 1.208000] initcall pci_iommu_init+0x0/0x11 returned 0 after 0 usecs
    > [ 1.212000] calling print_all_ICs+0x0/0x62a @ 1
    > [ 1.216000]
    > [ 1.216000] printing PIC contents
    > [ 1.220000] ... PIC IMR: fffa
    > [ 1.220000] ... PIC IRR: 0000
    > [ 1.224000] ... PIC ISR: 0000
    > [ 1.228000] ... PIC ELCR: 0828
    > [ 1.232000] BUG: unable to handle kernel paging request at ffffb020
    > [ 1.232000] IP: [<78417d5c>] native_apic_mem_read+0x15/0x19
    > [ 1.232000] *pde = 010ef067 *pte = 00000000
    > [ 1.232000] Oops: 0000 [#1] PREEMPT
    > [ 1.232000] last sysfs file:
    > [ 1.232000] Modules linked in:
    > [ 1.232000]
    > [ 1.232000] Pid: 1, comm: swapper Not tainted (2.6.30-rc5-tip #40847) System Product Name
    > [ 1.232000] EIP: 0060:[<78417d5c>] EFLAGS: 00010046 CPU: 0
    > [ 1.232000] EIP is at native_apic_mem_read+0x15/0x19
    > [ 1.232000] EAX: ffffb020 EBX: 00000000 ECX: 00000000 EDX: fffff000
    > [ 1.232000] ESI: 00000000 EDI: 7908c52e EBP: 9786fd38 ESP: 9786fd38
    > [ 1.232000] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
    > [ 1.232000] Process swapper (pid: 1, ti=9786e000 task=97870000 task.ti=9786e000)
    > [ 1.232000] Stack:
    > [ 1.232000] 9786fd40 78416e0d 9786fd48 78416fad 9786fd64 7908c55f 00000001 00000000
    > [ 1.232000] 00000000 00000000 7908c52e 9786fd78 784671bf 00000001 00000000 00000000
    > [ 1.232000] 9786fdac 7908ca42 00000001 9786fda0 784551ad 00000001 00000000 487ab0fc
    > [ 1.232000] Call Trace:
    > [ 1.232000] [<78416e0d>] ? read_apic_id+0x19/0x24
    > [ 1.232000] [<78416fad>] ? hard_smp_processor_id+0xd/0xf
    > [ 1.232000] [<7908c55f>] ? print_local_APIC+0x31/0x3c7
    > [ 1.232000] [<7908c52e>] ? print_local_APIC+0x0/0x3c7
    > [ 1.232000] [<784671bf>] ? smp_call_function_single+0x5b/0x64
    > [ 1.232000] [<7908ca42>] ? print_all_ICs+0x14d/0x62a
    > [ 1.232000] [<784551ad>] ? ktime_get+0x16/0x34
    > [ 1.232000] [<7908c8f5>] ? print_all_ICs+0x0/0x62a
    > [ 1.232000] [<7908c8f5>] ? print_all_ICs+0x0/0x62a
    > [ 1.232000] [<7840107f>] ? _stext+0x7f/0x1f2
    > [ 1.232000] [<786c2658>] ? put_dec+0x44/0x137
    > [ 1.232000] [<784afae4>] ? page_count+0x22/0x3f
    > [ 1.232000] [<784b1c0a>] ? get_page_from_freelist+0x51f/0x6b0
    > [ 1.232000] [<786c2658>] ? put_dec+0x44/0x137
    > [ 1.232000] [<784dcbee>] ? check_object+0x207/0x252
    > [ 1.232000] [<786bb54f>] ? ida_get_new_above+0x2b0/0x2ca
    > [ 1.232000] [<784dd5c5>] ? __slab_free+0x11a/0x4af
    > [ 1.232000] [<784df012>] ? kmem_cache_free+0xce/0x163
    > [ 1.232000] [<786bb54f>] ? ida_get_new_above+0x2b0/0x2ca
    > [ 1.232000] [<786bb54f>] ? ida_get_new_above+0x2b0/0x2ca
    > [ 1.232000] [<786bb75f>] ? ida_pre_get+0x13/0x18b
    > [ 1.232000] [<7853f384>] ? proc_register+0x32a/0x34e
    > [ 1.232000] [<7853f5bd>] ? create_proc_entry+0xf0/0x119
    > [ 1.232000] [<7847e0bc>] ? register_irq_proc+0x87/0xbb
    > [ 1.232000] [<7908251b>] ? kernel_init+0x8d/0x10a
    > [ 1.232000] [<7908248e>] ? kernel_init+0x0/0x10a
    > [ 1.232000] [<78403ee7>] ? kernel_thread_helper+0x7/0x10
    > [ 1.232000] Code: 44 00 00 89 d1 8b 15 08 8b de 78 8d 84 10 00 c0 ff ff 89 08 5d c3 55 89 e5 0f 1f 44 00 00 8b 15 08 8b de 78 8d 84 10 00 c0 ff ff <8b> 00 5d c3 55 89 e5 0f 1f 44 00 00 89 c2 eb 02 f3 90 8b 02 85
    > [ 1.232000] EIP: [<78417d5c>] native_apic_mem_read+0x15/0x19 SS:ESP 0068:9786fd38
    > [ 1.232000] CR2: 00000000ffffb020
    > [ 1.232000] ---[ end trace a7919e7f17c0a725 ]---
    > [ 1.232000] Kernel panic - not syncing: Fatal exception
    >
    > Ingo
    >
    > [ 0.000000] Linux version 2.6.30-rc5-tip (mingo@sirius) (gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC) ) #40847 PREEMPT Mon May 11 12:34:41 CEST 2009
    > [ 0.000000] KERNEL supported cpus:
    > [ 0.000000] Intel GenuineIntel
    > [ 0.000000] NSC Geode by NSC
    > [ 0.000000] Cyrix CyrixInstead
    > [ 0.000000] Centaur CentaurHauls
    > [ 0.000000] Transmeta GenuineTMx86
    > [ 0.000000] Transmeta TransmetaCPU
    > [ 0.000000] UMC UMC UMC UMC
    > [ 0.000000] CPU: vendor_id 'AuthenticAMD' unknown, using generic init.
    > [ 0.000000] CPU: Your system may be unstable.
    > [ 0.000000] BIOS-provided physical RAM map:
    > [ 0.000000] BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
    > [ 0.000000] BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
    > [ 0.000000] BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
    > [ 0.000000] BIOS-e820: 0000000000100000 - 000000003fff0000 (usable)
    > [ 0.000000] BIOS-e820: 000000003fff0000 - 000000003fff3000 (ACPI NVS)
    > [ 0.000000] BIOS-e820: 000000003fff3000 - 0000000040000000 (ACPI data)
    > [ 0.000000] BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
    > [ 0.000000] BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
    > [ 0.000000] console [earlyser0] enabled
    > [ 0.000000] debug: ignoring loglevel setting.
    > [ 0.000000] MPS support code is not built-in.
    > [ 0.000000] Using acpi=off or acpi=noirq or pci=noacpi may have problem
    ...
    > [ 0.000000] Using APIC driver default
    > [ 0.000000] Nvidia board detected. Ignoring ACPI timer override.
    > [ 0.000000] If you got timer trouble try acpi_use_timer_override
    > [ 0.000000] APIC: disable apic facility
    > [ 0.000000] nr_irqs_gsi: 16
    > [ 0.000000] Allocating PCI resources starting at 40000000 (gap: 40000000:a0000000)
    > [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 259967
    > [ 0.000000] Kernel command line: root=/dev/sda1 earlyprintk=serial,ttyS0,115200,keep console=tty debug initcall_debug enforcing=0 apic=verbose ignore_loglevel sysrq_always_enabled selinux=0 nmi_watchdog=0 3 panic=1 maxcpus=1 nosmp noapic idle=mwait highmem=512m notsc acpi=off
    ...
    > [ 1.212000] calling print_all_ICs+0x0/0x62a @ 1
    > [ 1.216000]
    > [ 1.216000] printing PIC contents
    > [ 1.220000] ... PIC IMR: fffa
    > [ 1.220000] ... PIC IRR: 0000
    > [ 1.224000] ... PIC ISR: 0000
    > [ 1.228000] ... PIC ELCR: 0828
    > [ 1.232000] BUG: unable to handle kernel paging request at ffffb020
    > [ 1.232000] IP: [<78417d5c>] native_apic_mem_read+0x15/0x19
    > [ 1.232000] *pde = 010ef067 *pte = 00000000
    > [ 1.232000] Oops: 0000 [#1] PREEMPT
    > [ 1.232000] last sysfs file:
    > [ 1.232000] Modules linked in:
    > [ 1.232000]
    > [ 1.232000] Pid: 1, comm: swapper Not tainted (2.6.30-rc5-tip #40847) System Product Name
    > [ 1.232000] EIP: 0060:[<78417d5c>] EFLAGS: 00010046 CPU: 0
    > [ 1.232000] EIP is at native_apic_mem_read+0x15/0x19
    > [ 1.232000] EAX: ffffb020 EBX: 00000000 ECX: 00000000 EDX: fffff000
    > [ 1.232000] ESI: 00000000 EDI: 7908c52e EBP: 9786fd38 ESP: 9786fd38
    > [ 1.232000] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
    > [ 1.232000] Process swapper (pid: 1, ti=9786e000 task=97870000 task.ti=9786e000)
    > [ 1.232000] Stack:
    > [ 1.232000] 9786fd40 78416e0d 9786fd48 78416fad 9786fd64 7908c55f 00000001 00000000
    > [ 1.232000] 00000000 00000000 7908c52e 9786fd78 784671bf 00000001 00000000 00000000
    > [ 1.232000] 9786fdac 7908ca42 00000001 9786fda0 784551ad 00000001 00000000 487ab0fc
    > [ 1.232000] Call Trace:
    > [ 1.232000] [<78416e0d>] ? read_apic_id+0x19/0x24
    > [ 1.232000] [<78416fad>] ? hard_smp_processor_id+0xd/0xf
    > [ 1.232000] [<7908c55f>] ? print_local_APIC+0x31/0x3c7
    > [ 1.232000] [<7908c52e>] ? print_local_APIC+0x0/0x3c7
    > [ 1.232000] [<784671bf>] ? smp_call_function_single+0x5b/0x64
    > [ 1.232000] [<7908ca42>] ? print_all_ICs+0x14d/0x62a
    > [ 1.232000] [<784551ad>] ? ktime_get+0x16/0x34
    > [ 1.232000] [<7908c8f5>] ? print_all_ICs+0x0/0x62a
    > [ 1.232000] [<7908c8f5>] ? print_all_ICs+0x0/0x62a
    > [ 1.232000] [<7840107f>] ? _stext+0x7f/0x1f2
    > [ 1.232000] [<786c2658>] ? put_dec+0x44/0x137
    > [ 1.232000] [<784afae4>] ? page_count+0x22/0x3f
    > [ 1.232000] [<784b1c0a>] ? get_page_from_freelist+0x51f/0x6b0
    > [ 1.232000] [<786c2658>] ? put_dec+0x44/0x137
    > [ 1.232000] [<784dcbee>] ? check_object+0x207/0x252
    > [ 1.232000] [<786bb54f>] ? ida_get_new_above+0x2b0/0x2ca
    > [ 1.232000] [<784dd5c5>] ? __slab_free+0x11a/0x4af
    > [ 1.232000] [<784df012>] ? kmem_cache_free+0xce/0x163
    > [ 1.232000] [<786bb54f>] ? ida_get_new_above+0x2b0/0x2ca
    > [ 1.232000] [<786bb54f>] ? ida_get_new_above+0x2b0/0x2ca
    > [ 1.232000] [<786bb75f>] ? ida_pre_get+0x13/0x18b
    > [ 1.232000] [<7853f384>] ? proc_register+0x32a/0x34e
    > [ 1.232000] [<7853f5bd>] ? create_proc_entry+0xf0/0x119
    > [ 1.232000] [<7847e0bc>] ? register_irq_proc+0x87/0xbb
    > [ 1.232000] [<7908251b>] ? kernel_init+0x8d/0x10a
    > [ 1.232000] [<7908248e>] ? kernel_init+0x0/0x10a
    > [ 1.232000] [<78403ee7>] ? kernel_thread_helper+0x7/0x10
    > [ 1.232000] Code: 44 00 00 89 d1 8b 15 08 8b de 78 8d 84 10 00 c0 ff ff 89 08 5d c3 55 89 e5 0f 1f 44 00 00 8b 15 08 8b de 78 8d 84 10 00 c0 ff ff <8b> 00 5d c3 55 89 e5 0f 1f 44 00 00 89 c2 eb 02 f3 90 8b 02 85
    > [ 1.232000] EIP: [<78417d5c>] native_apic_mem_read+0x15/0x19 SS:ESP 0068:9786fd38
    > [ 1.232000] CR2: 00000000ffffb020
    > [ 1.232000] ---[ end trace a7919e7f17c0a725 ]---
    > [ 1.232000] Kernel panic - not syncing: Fatal exception

    so !cpu_has_apic

    we may add one native_apic_mem_read_dummy? also we could avoid alloc_bootmem_pages(PAGE_SIZE) to spare 4k bytes.

    and we should check if cpu_has_apic in print_all_ICs()

    YH


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