| Commit message (Collapse) | Author | Age |
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The proposed Moorestown support patches use an extra feature flag
mechanism to make the ioapic work w/o an i8259. There is a much
simpler solution.
Most i8259 specific functions are already called dependend on the irq
number less than NR_IRQS_LEGACY. Replacing that constant by a
read_mostly variable which can be set to 0 by the platform setup code
allows us to achieve the same without any special feature flags.
That trivial change allows us to proceed with MRST w/o doing a full
blown overhaul of the ioapic code which would delay MRST unduly.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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The timer init code is convoluted with several quirks and the paravirt
timer chooser. Figuring out which code path is actually taken is not
for the faint hearted.
Move the numaq TSC quirk to tsc_pre_init x86_init_ops function and
replace the paravirt time chooser and the remaining x86 quirk with a
simple x86_init_ops function.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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paravirt overrides the setup of the default apic timers as per cpu
timers. Moorestown needs to override that as well.
Move it to x86_init_ops setup and create a separate x86_cpuinit struct
which holds the function for the secondary evtl. hotplugabble CPUs.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Replace the quirks by a simple x86_init_ops function.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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irq_init is overridden by x86_quirks and by paravirts. Unify the whole
mess and make it an unconditional x86_init_ops function which defaults
to the standard function and can be overridden by the early platform
code.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Replace the quirk machinery by a x86_init_ops function which
defaults to the standard implementation. This is also a preparatory
patch for Moorestown support which needs to replace the default
init_ISA_irqs as well.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Replace the quirk machinery by a x86_init_ops function which defaults
to the standard implementation.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Move smp_read_mpc_oem from quirks to x86_init.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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The mpc_apic_id setup is handled by a x86_quirk. Make it a
x86_init_ops function with a default implementation.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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32bit and also the numaq code have special requirements on the
ioapic_id setup. Convert it to a x86_init_ops function and get rid
of the quirks and #ifdefs
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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The x86 quirkification introduced an extra ugly hackery with a
variable pointer in the mpparse code. If the pointer is initialized
then it is dereferenced and the variable set to 0 or incremented.
Create a x86_init_ops function and let the affected numaq code
hold the function. Default init is a setup noop.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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memory_setup is overridden by x86_quirks and by paravirts with weak
functions and quirks. Unify the whole mess and make it an
unconditional x86_init_ops function which defaults to the standard
function and can be overridden by the early platform code.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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In case of discrete (pretty old) apics we may have cpu_has_apic bit
not set but have to check if smp_found_config (MP spec) is there
and apic was not disabled.
Also don't forget to print apic/io-apic for such case as well.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <20090915071230.GA10604@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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On Intel platforms, we can use logical flat mode if there are <= 8
logical cpu's (irrespective of physical apic id values). This will
enable simplified and efficient IPI and device interrupt routing on
such platforms.
Fix the relevant comments while we are at it.
We can clean up default_setup_apic_routing() by using apic->probe()
but that is a different item.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: "yinghai@kernel.org" <yinghai@kernel.org>
LKML-Reference: <1253327399.3948.747.camel@sbs-t61.sc.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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UV depends on the MMRHI space being identity mapped. The patch:
x86: Make 64-bit efi_ioremap use ioremap on MMIO regions
changed this to make efi regions at a different address using
ioremap. Add the identity mapping to uv_system_init.
( Note this code was previously present but was deleted when BIOS
added the ranges to the EFI map - previous efi code identify
mapped the ranges. )
Signed-off-by: Jack Steiner <steiner@sgi.com>
LKML-Reference: <20090909154339.GA7946@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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This was done using Coccinelle's BUG_ON semantic patch.
Signed-off-by: Daniel Walker <dwalker@fifo99.com>
Cc: Julia Lawall <julia@diku.dk>
LKML-Reference: <1252777220-30796-1-git-send-email-dwalker@fifo99.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-mce-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (21 commits)
x86, mce: Fix compilation with !CONFIG_DEBUG_FS in mce-severity.c
x86, mce: CE in last bank prevents panic by unknown MCE
x86, mce: Fake panic support for MCE testing
x86, mce: Move debugfs mce dir creating to mce.c
x86, mce: Support specifying raise mode for software MCE injection
x86, mce: Support specifying context for software mce injection
x86, mce: fix reporting of Thermal Monitoring mechanism enabled
x86, mce: remove never executed code
x86, mce: add missing __cpuinit tags
x86, mce: fix "mce" boot option handling for CONFIG_X86_NEW_MCE
x86, mce: don't log boot MCEs on Pentium M (model == 13) CPUs
x86: mce: Lower maximum number of banks to architecture limit
x86: mce: macros to compute banks MSRs
x86: mce: Move per bank data in a single datastructure
x86: mce: Move code in mce.c
x86: mce: Rename CONFIG_X86_NEW_MCE to CONFIG_X86_MCE
x86: mce: Remove old i386 machine check code
x86: mce: Update X86_MCE description in x86/Kconfig
x86: mce: Make CONFIG_X86_ANCIENT_MCE dependent on CONFIG_X86_MCE
x86, mce: use atomic_inc_return() instead of add by 1
...
Manually fixed up trivial conflicts:
Documentation/feature-removal-schedule.txt
arch/x86/kernel/cpu/mcheck/mce.c
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Drop the CONFIG_X86_NEW_MCE symbol and change all
references to it to check for CONFIG_X86_MCE directly.
No code changes
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
x86: Make memtype_seq_ops const
x86: uv: Clean up uv_ptc_init(), use proc_create()
x86: Use printk_once()
x86/cpu: Clean up various files a bit
x86: Remove duplicated #include
x86, ipi: Clean up safe_smp_processor_id() by using the cpu_has_apic() macro helper
x86: Clean up idt_descr and idt_tableby using NR_VECTORS instead of hardcoded number
x86: Further clean up of mtrr/generic.c
x86: Clean up mtrr/main.c
x86: Clean up mtrr/state.c
x86: Clean up mtrr/mtrr.h
x86: Clean up mtrr/if.c
x86: Clean up mtrr/generic.c
x86: Clean up mtrr/cyrix.c
x86: Clean up mtrr/cleanup.c
x86: Clean up mtrr/centaur.c
x86: Clean up mtrr/amd.c:
x86: ds.c fix invalid assignment
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Merge reason: we were on -rc1 before - go up to -rc7
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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helper
We already use a lot of cpu_has_ helpers.
Lets do here the same for consistency.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <20090705160154.GB4791@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (24 commits)
ACPI, x86: expose some IO-APIC routines when CONFIG_ACPI=n
x86, apic: Slim down stack usage in early_init_lapic_mapping()
x86, ioapic: Get rid of needless check and simplify ioapic_setup_resources()
x86, ioapic: Define IO_APIC_DEFAULT_PHYS_BASE constant
x86: Fix x86_model test in es7000_apic_is_cluster()
x86, apic: Move dmar_table_init() out of enable_IR()
x86, ioapic: Panic on irq-pin binding only if needed
x86/apic: Enable x2APIC without interrupt remapping under KVM
x86, apic: Drop redundant bit assignment
x86, ioapic: Throw BUG instead of NULL dereference
x86, ioapic: Introduce for_each_irq_pin() helper
x86: Remove superfluous NULL pointer check in destroy_irq()
x86/ioapic.c: unify ioapic_retrigger_irq()
x86/ioapic.c: convert __target_IO_APIC_irq to conventional for() loop
x86/ioapic.c: clean up replace_pin_at_irq_node logic and comments
x86/ioapic.c: convert replace_pin_at_irq_node to conventional for() loop
x86/ioapic.c: simplify add_pin_to_irq_node()
x86/ioapic.c: convert io_apic_level_ack_pending loop to normal for() loop
x86/ioapic.c: move lost comment to what seems like appropriate place
x86/ioapic.c: remove redundant declaration of irq_pin_list
...
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git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-sfi-2.6 into x86/apic
Merge reason: the SFI (Simple Firmware Interface) feature in the ACPI
tree needs this cleanup, pull it into the APIC branch as
well so that there's no interactions.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Some IO-APIC routines are ACPI specific now, but need to
be exposed when CONFIG_ACPI=n for the benefit of SFI.
Remove #ifdef ACPI around these routines:
io_apic_get_unique_id(int ioapic, int apic_id);
io_apic_get_version(int ioapic);
io_apic_get_redir_entries(int ioapic);
Move these routines from ACPI-specific boot.c to io_apic.c:
uniq_ioapic_id(u8 id)
mp_find_ioapic()
mp_find_ioapic_pin()
mp_register_ioapic()
Also, since uniq_ioapic_id() is now no longer static,
re-name it to io_apic_unique_id() for consistency
with the other public io_apic routines.
For simplicity, do not #ifdef the resulting code ACPI || SFI,
thought that could be done in the future if it is important
to optimize the !ACPI !SFI IO-APIC x86 kernel for size.
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Cc: x86@kernel.org
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As far as I see there is no external poking of mp_lapic_addr in
this procedure which could lead to unpredited changes and
require local storage unit for it. Lets use it plain forward.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <20090826171324.GC4548@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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alloc_bootmem() already panics on allocation failure. There is
no need to check the result.
Also there is a way to unbind global variable from its body and
use it as a parameter which allow us to simplify
ioapic_init_mappings as well -- "for" cycle already uses
nr_ioapics as a conditional variable and there is no need to
check if ioapic_setup_resources was returning NULL again.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <20090824175551.493629148@openvz.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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For the x86_model to be greater than 6 or less than 12 is
logically always true.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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On an x2apic system, we got:
[ 1.818072] ------------[ cut here ]------------
[ 1.820376] WARNING: at kernel/lockdep.c:2461 lockdep_trace_alloc+0xa5/0xe9()
[ 1.835282] Hardware name: ASSY,
[ 1.839006] Modules linked in:
[ 1.841253] Pid: 1, comm: swapper Not tainted 2.6.31-rc5-tip-03926-g39aaa80-dirty #510
[ 1.858056] Call Trace:
[ 1.859913] [<ffffffff810d13aa>] ? lockdep_trace_alloc+0xa5/0xe9
[ 1.876270] [<ffffffff81093f37>] warn_slowpath_common+0x8d/0xd0
[ 1.879132] [<ffffffff81093fa1>] warn_slowpath_null+0x27/0x3d
[ 1.896823] [<ffffffff810d13aa>] lockdep_trace_alloc+0xa5/0xe9
[ 1.900659] [<ffffffff810cf5a0>] ? lock_release_holdtime+0x2f/0x199
[ 1.917188] [<ffffffff81167a3c>] kmem_cache_alloc_notrace+0x42/0x111
[ 1.922320] [<ffffffff8106fe8c>] ? reserve_memtype+0x152/0x518
[ 1.938137] [<ffffffff8106f8b1>] ? pat_pagerange_is_ram+0x4a/0x91
[ 1.941730] [<ffffffff8106fe8c>] reserve_memtype+0x152/0x518
[ 1.958115] [<ffffffff8106ce62>] __ioremap_caller+0x1dd/0x30f
[ 1.975507] [<ffffffff81ce2c5c>] ? acpi_os_map_memory+0x2a/0x47
[ 1.978987] [<ffffffff8106d0fd>] ioremap_nocache+0x2a/0x40
[ 2.031400] [<ffffffff810d0364>] ? trace_hardirqs_off+0x20/0x36
[ 2.036096] [<ffffffff81ce2c5c>] acpi_os_map_memory+0x2a/0x47
[ 2.046263] [<ffffffff815cd642>] acpi_tb_verify_table+0x3d/0x85
[ 2.050349] [<ffffffff81d34af7>] ? _spin_unlock_irqrestore+0x50/0x76
[ 2.067327] [<ffffffff815ccad6>] acpi_get_table_with_size+0x64/0xd9
[ 2.070860] [<ffffffff81d34af7>] ? _spin_unlock_irqrestore+0x50/0x76
[ 2.088000] [<ffffffff825c88d5>] dmar_table_detect+0x33/0x70
[ 2.092047] [<ffffffff825c8a01>] dmar_table_init+0x43/0x428
[ 2.106854] [<ffffffff825a7537>] enable_IR+0x1c/0x8d
[ 2.110256] [<ffffffff825a7624>] enable_IR_x2apic+0x7c/0x19e
[ 2.127139] [<ffffffff825a4876>] native_smp_prepare_cpus+0x139/0x3b8
[ 2.145175] [<ffffffff8259678d>] kernel_init+0x71/0x1da
[ 2.148913] [<ffffffff8104305a>] child_rip+0xa/0x20
[ 2.152349] [<ffffffff810429fc>] ? restore_args+0x0/0x30
[ 2.167931] [<ffffffff8259671c>] ? kernel_init+0x0/0x1da
[ 2.171671] [<ffffffff81043050>] ? child_rip+0x0/0x20
[ 2.187607] ---[ end trace a7919e7f17c0a725 ]---
Venkatesh Pallipadi said:
| Looks like the problem started with this commit
|
| commit ce69a784504222c3ab6f1b3c357d09ec5772127a
| Author: Gleb Natapov <gleb@redhat.com>
| Date: Mon Jul 20 15:24:17 2009 +0300
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| x86/apic: Enable x2APIC without interrupt remapping under KVM
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| Before this commit, dmar_table_init() was getting called
| with interrupts enabled and after this commit, it is getting
| called with interrupts disabled.
so try to move out dmar_table_init out of that function.
Analyzed-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
LKML-Reference: <4A899F3C.2050104@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Though the most time we are to panic on irq-pin allocation
fails, for PCI interrupts it's not the case and we could
continue operate even if irq-pin allocation failed.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <20090805200931.GB5319@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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KVM would like to provide x2APIC interface to a guest without emulating
interrupt remapping device. The reason KVM prefers guest to use x2APIC
is that x2APIC interface is better virtualizable and provides better
performance than mmio xAPIC interface:
- msr exits are faster than mmio (no page table walk, emulation)
- no need to read back ICR to look at the busy bit
- one 64 bit ICR write instead of two 32 bit writes
- shared code with the Hyper-V paravirt interface
Included patch changes x2APIC enabling logic to enable it even if IR
initialization failed, but kernel runs under KVM and no apic id is
greater than 255 (if there is one spec requires BIOS to move to x2apic
mode before starting an OS).
-v2: fix build
-v3: fix bug causing compiler warning
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Sheng Yang <sheng@linux.intel.com>
Cc: "avi@redhat.com" <avi@redhat.com>
LKML-Reference: <20090720122417.GR5638@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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cpu_has_apic has already investigated boot_cpu_data
X86_FEATURE_APIC bit for being clear if condition is
triggered.
So there is no need to clear this bit second time.
Signed-off-by: Cyrill Gorcuno v <gorcunov@openvz.org>
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>
LKML-Reference: <20090722205259.GE15805@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Instead of plain NULL deref we better throw error
message with a backtrace. Actually we need more
gracious error handling here. Meanwhile leave it
as is.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: yinghai@kernel.org
LKML-Reference: <20090801075435.769301745@openvz.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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This allow us to save a few lines of code.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: yinghai@kernel.org
LKML-Reference: <20090801075435.597863129@openvz.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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This takes care of the following entry from Dan's list:
arch/x86/kernel/apic/io_apic.c +3241 destroy_irq(11) warning: variable derefenced before check 'desc'
Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Eugene Teo <eteo@redhat.com>
Cc: Julia Lawall <julia@diku.dk>
LKML-Reference: <200907302321.19086.bzolnier@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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The 32 and 64-bit versions of ioapic_retrigger_irq() are identical
except the 64-bit one takes vector_lock. vector_lock is defined and
used on 32-bit too, so just use a common ioapic_retrigger_irq().
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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Use a normal for() loop in __target_IO_APIC_irq().
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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There's no need for a control variable in replace_pin_at_irq_node();
it can just return if it finds the old apic/pin to replace.
If the loop terminates, then it didn't find the old apic/pin, so it can
add the new ones.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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Use a conventional for() loop in replace_pin_at_irq_node().
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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Rather than duplicating the same alloc/init code twice, restructure
the function to look for duplicates and then add an entry
if none is found.
This function is not performance critical; all but one of its callers
are __init functions, and the non-__init caller is for PCI device setup.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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Convert the unconventional loop in io_apic_level_ack_pending() to
a conventional for() loop.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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The comment got separated from its subject, so move it to what
appears to be the right place, and update to describe the current
structure.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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The structure is defined immediately below, so there's no need
to forward declare it.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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While no 64-bit hardware will have a version 0x11 I/O APIC which needs
the level/edge bug workaround, that's not a particular reason to use
CONFIG_X86_32 to #ifdef the code out. Most 32-bit machines will no
longer need the workaround either, so the test to see whether it is
necessary should be more fine-grained than "32-bit=yes, 64-bit=no".
(Also fix formatting of block comment.)
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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The main difference between 32 and 64-bit __mask_IO_APIC_irq() does a
readback from the I/O APIC to synchronize it.
If there's a hardware requirement to do a readback sync after updating
an APIC register, then it will be a hardware requrement regardless of
whether the kernel is compiled 32 or 64-bit.
Unify __mask_IO_APIC_irq() using the 64-bit version which always syncs
with io_apic_sync().
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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If ioapic_modify_irq() is marked inline, it gets inlined several times.
Un-inlining it saves around 200 bytes in .text for me.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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| |\ \ \ \ \ \
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'core-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
debug lockups: Improve lockup detection, fix generic arch fallback
debug lockups: Improve lockup detection
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As Andrew noted, my previous patch ("debug lockups: Improve lockup
detection") broke/removed SysRq-L support from architecture that do
not provide a __trigger_all_cpu_backtrace implementation.
Restore a fallback path and clean up the SysRq-L machinery a bit:
- Rename the arch method to arch_trigger_all_cpu_backtrace()
- Simplify the define
- Document the method a bit - in the hope of more architectures
adding support for it.
[ The patch touches Sparc code for the rename. ]
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "David S. Miller" <davem@davemloft.net>
LKML-Reference: <20090802140809.7ec4bb6b.akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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When debugging a recent lockup bug i found various deficiencies
in how our current lockup detection helpers work:
- SysRq-L is not very efficient as it uses a workqueue, hence
it cannot punch through hard lockups and cannot see through
most soft lockups either.
- The SysRq-L code depends on the NMI watchdog - which is off
by default.
- We dont print backtraces from the RCU code's built-in
'RCU state machine is stuck' debug code. This debug
code tends to be one of the first (and only) mechanisms
that show that a lockup has occured.
This patch changes the code so taht we:
- Trigger the NMI backtrace code from SysRq-L instead of using
a workqueue (which cannot punch through hard lockups)
- Trigger print-all-CPU-backtraces from the RCU lockup detection
code
Also decouple the backtrace printing code from the NMI watchdog:
- Dont use variable size cpumasks (it might not be initialized
and they are a bit more fragile anyway)
- Trigger an NMI immediately via an IPI, instead of waiting
for the NMI tick to occur. This is a lot faster and can
produce more relevant backtraces. It will also work if the
NMI watchdog is disabled.
- Dont print the 'dazed and confused' message when we print
a backtrace from the NMI
- Do a show_regs() plus a dump_stack() to get maximum info
out of the dump. Worst-case we get two stacktraces - which
is not a big deal. Sometimes, if register content is
corrupted, the precise stack walker in show_regs() wont
give us a full backtrace - in this case dump_stack() will
do it.
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
|
