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android_kernel_xiaomi_sm8350/include/asm-i386
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Fernando Luis VazquezCao f2b218dd61 [PATCH] i386: safe_apic_wait_icr_idle - i386 
apic_wait_icr_idle looks like this:

static __inline__ void apic_wait_icr_idle(void)
{
  while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
    cpu_relax();
}

The busy loop in this function would not be problematic if the
corresponding status bit in the ICR were always updated, but that does
not seem to be the case under certain crash scenarios. Kdump uses an IPI
to stop the other CPUs in the event of a crash, but when any of the
other CPUs are locked-up inside the NMI handler the CPU that sends the
IPI will end up looping forever in the ICR check, effectively
hard-locking the whole system.

Quoting from Intel's "MultiProcessor Specification" (Version 1.4), B-3:

"A local APIC unit indicates successful dispatch of an IPI by
resetting the Delivery Status bit in the Interrupt Command
Register (ICR). The operating system polls the delivery status
bit after sending an INIT or STARTUP IPI until the command has
been dispatched.

A period of 20 microseconds should be sufficient for IPI dispatch
to complete under normal operating conditions. If the IPI is not
successfully dispatched, the operating system can abort the
command. Alternatively, the operating system can retry the IPI by
writing the lower 32-bit double word of the ICR. This “time-out”
mechanism can be implemented through an external interrupt, if
interrupts are enabled on the processor, or through execution of
an instruction or time-stamp counter spin loop."

Intel's documentation suggests the implementation of a time-out
mechanism, which, by the way, is already being open-coded in some parts
of the kernel that tinker with ICR.

Create a apic_wait_icr_idle replacement that implements the time-out
mechanism and that can be used to solve the aforementioned problem.

AK: moved both functions out of line
AK: added improved loop from Keith Owens

Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Andi Kleen <ak@suse.de>
2007-05-02 19:27:17 +02:00
..
mach-bigsmp [PATCH] x86: default to physical mode on hotplug CPU kernels 2007-05-02 19:27:04 +02:00
mach-default [PATCH] x86: default to physical mode on hotplug CPU kernels 2007-05-02 19:27:04 +02:00
mach-es7000 [PATCH] i386: modpost apic related warning fixes 2007-05-02 19:27:08 +02:00
mach-generic [PATCH] x86: default to physical mode on hotplug CPU kernels 2007-05-02 19:27:04 +02:00
mach-numaq [PATCH] x86: default to physical mode on hotplug CPU kernels 2007-05-02 19:27:04 +02:00
mach-summit [PATCH] x86: Log reason why TSC was marked unstable 2007-05-02 19:27:08 +02:00
mach-visws [PATCH] x86: default to physical mode on hotplug CPU kernels 2007-05-02 19:27:04 +02:00
mach-voyager [PATCH] clockevents: i386 drivers 2007-02-16 08:13:59 -08:00
8253pit.h
a.out.h
acpi.h ACPI: cleanup: make disable_acpi() valid w/o CONFIG_ACPI 2007-02-13 00:09:13 -05:00
agp.h
alternative-asm.i Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
alternative.h [PATCH] x86: PARAVIRT: Jeremy Fitzhardinge <jeremy@goop.org> 2007-05-02 19:27:16 +02:00
apic.h [PATCH] i386: safe_apic_wait_icr_idle - i386 2007-05-02 19:27:17 +02:00
apicdef.h
arch_hooks.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
atomic.h [PATCH] Numerous fixes to kernel-doc info in source files. 2007-02-11 10:51:32 -08:00
auxvec.h
bitops.h [PATCH] Numerous fixes to kernel-doc info in source files. 2007-02-11 10:51:32 -08:00
boot.h [PATCH] i386: Restore CONFIG_PHYSICAL_START option 2007-01-05 23:55:23 -08:00
bug.h [PATCH] Generic BUG for i386 2006-12-08 08:28:39 -08:00
bugs.h [PATCH] x86: update for i386 and x86-64 check_bugs 2007-05-02 19:27:16 +02:00
byteorder.h
cache.h
cacheflush.h [PATCH] Optimize D-cache alias handling on fork 2006-12-13 09:27:08 -08:00
checksum.h [NET]: I386 checksum annotations and cleanups. 2006-12-02 21:23:19 -08:00
cpu.h [PATCH] i386: introduce the mechanism of disabling cpu hotplug control 2006-12-07 02:14:10 +01:00
cpufeature.h [PATCH] x86-64: Disable local APIC timer use on AMD systems with C1E 2007-04-02 12:14:12 +02:00
cputime.h
current.h [PATCH] i386: Convert PDA into the percpu section 2007-05-02 19:27:16 +02:00
debugreg.h
delay.h [PATCH] vmi: paravirt drop udelay op 2007-03-05 07:57:52 -08:00
desc.h [PATCH] i386: Page-align the GDT 2007-05-02 19:27:15 +02:00
device.h ACPI: Change ACPI to use dev_archdata instead of firmware_data 2006-12-01 14:52:01 -08:00
div64.h [NET]: div64_64 consolidate (rev3) 2007-04-25 22:23:33 -07:00
dma-mapping.h [PATCH] Pass struct dev pointer to dma_cache_sync() 2006-12-07 08:39:41 -08:00
dma.h
dmi.h
dwarf2.h [PATCH] i386/x86-64: Work around gcc bug with noreturn functions in unwinder 2006-09-26 10:52:41 +02:00
e820.h [PATCH] x86: fix amd64-agp aperture validation 2007-05-02 19:27:11 +02:00
edac.h
elf.h [PATCH] i386: Relocate VDSO ELF headers to match mapped location with COMPAT_VDSO 2007-05-02 19:27:12 +02:00
emergency-restart.h
errno.h
fcntl.h
fixmap.h [PATCH] i386: PARAVIRT: Allocate a fixmap slot 2007-05-02 19:27:13 +02:00
floppy.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
frame.i Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
futex.h [PATCH] mm: pagefault_{disable,enable}() 2006-12-07 08:39:21 -08:00
genapic.h [PATCH] x86: default to physical mode on hotplug CPU kernels 2007-05-02 19:27:04 +02:00
hardirq.h
highmem.h [PATCH] i386: PARAVIRT: add kmap_atomic_pte for mapping highpte pages 2007-05-02 19:27:15 +02:00
hpet.h [PATCH] x86: adjust inclusion of asm/fixmap.h 2007-05-02 19:27:04 +02:00
hw_irq.h [PATCH] i386/x86_64: Remove global IO_APIC_VECTOR 2006-10-08 12:24:02 -07:00
hypertransport.h [PATCH] Initial generic hypertransport interrupt support 2006-10-04 07:55:29 -07:00
i387.h [PATCH] i386: add sleazy FPU optimization 2006-12-07 02:14:01 +01:00
i8253.h [PATCH] clockevents: i386 drivers 2007-02-16 08:13:59 -08:00
i8259.h
ide.h [PATCH] ide: more conversion to pci_get APIs 2006-12-08 08:29:03 -08:00
intel_arch_perfmon.h [PATCH] x86: i386/x86-64 Add nmi watchdog support for new Intel CPUs 2006-09-26 10:52:27 +02:00
io_apic.h [PATCH] io_apic.h needs apicdef.h 2007-03-05 07:57:50 -08:00
io.h [PATCH] i386: rationalize paravirt wrappers 2007-05-02 19:27:10 +02:00
ioctl.h
ioctls.h
ipc.h
ipcbuf.h
irq_regs.h [PATCH] i386: Convert PDA into the percpu section 2007-05-02 19:27:16 +02:00
irq.h [PATCH] x86: revert x86_64-mm-fix-the-irqbalance-quirk-for-e7320-e7520-e7525 2007-05-02 19:27:04 +02:00
irqflags.h [PATCH] i386: Use X86_EFLAGS_IF in irqflags.h. 2007-05-02 19:27:10 +02:00
ist.h
k8.h
Kbuild [PATCH] x86: Clean up x86 control register and MSR macros (corrected) 2007-05-02 19:27:12 +02:00
kdebug.h
kexec.h [PATCH] i386: Allow i386 crash kernels to handle x86_64 dumps 2007-05-02 19:27:09 +02:00
kmap_types.h
kprobes.h
ldt.h
linkage.h
local.h
math_emu.h [PATCH] i386: PDA: Fix math emulator for new pt_regs 2006-12-07 02:14:03 +01:00
mc146818rtc.h
mca_dma.h [PATCH] kernel-doc for kernel/dma.c 2006-10-03 08:03:41 -07:00
mca.h
mce.h [PATCH] i386: Move mce_disabled to asm/mce.h 2007-02-13 13:26:26 +01:00
mman.h
mmu_context.h [PATCH] x86: PARAVIRT: add hooks to intercept mm creation and destruction 2007-05-02 19:27:14 +02:00
mmu.h
mmx.h
mmzone.h [PATCH] silence unused pgdat warning from alloc_bootmem_node and friends 2006-12-07 08:39:23 -08:00
module.h [PATCH] i386: Add an option for the VIA C7 which sets appropriate L1 cache 2007-05-02 19:27:05 +02:00
mpspec_def.h [PATCH] x86-64: remove remaining pc98 code 2006-12-07 02:14:19 +01:00
mpspec.h [PATCH] clockevents: i386 drivers 2007-02-16 08:13:59 -08:00
msgbuf.h
msidef.h [PATCH] genirq: i386 irq: Move msi message composition into io_apic.c 2006-10-04 07:55:28 -07:00
msr-index.h [PATCH] i386: Enable support for fixed-range IORRs to keep RdMem & WrMem in sync 2007-05-02 19:27:17 +02:00
msr.h [PATCH] x86: Clean up x86 control register and MSR macros (corrected) 2007-05-02 19:27:12 +02:00
mtrr.h [PATCH] x86: Save the MTRRs of the BSP before booting an AP 2007-05-02 19:27:17 +02:00
mutex.h [PATCH] i386: Remove lock section support in mutex.h 2006-09-26 10:52:31 +02:00
namei.h
nmi.h Disable NMI watchdog by default properly 2007-03-14 17:53:43 -07:00
numa.h
numaq.h
page.h [PATCH] i386: PARAVIRT: Add pagetable accessors to pack and unpack pagetable entries 2007-05-02 19:27:13 +02:00
param.h [PATCH] cleanup asm/setup.h userspace visibility 2006-12-07 08:39:46 -08:00
paravirt.h [PATCH] i386: PARAVIRT: drop unused ptep_get_and_clear 2007-05-02 19:27:15 +02:00
parport.h
pci-direct.h
pci.h
percpu.h [PATCH] i386: Define per_cpu_offset 2007-05-02 19:27:16 +02:00
pgalloc.h [PATCH] x86: adjust inclusion of asm/fixmap.h 2007-05-02 19:27:04 +02:00
pgtable-2level-defs.h [PATCH] i386: PARAVIRT: Allow paravirt backend to choose kernel PMD sharing 2007-05-02 19:27:13 +02:00
pgtable-2level.h [PATCH] i386: PARAVIRT: Allow paravirt backend to choose kernel PMD sharing 2007-05-02 19:27:13 +02:00
pgtable-3level-defs.h [PATCH] i386: PARAVIRT: Allow paravirt backend to choose kernel PMD sharing 2007-05-02 19:27:13 +02:00
pgtable-3level.h [PATCH] i386: PARAVIRT: Allow paravirt backend to choose kernel PMD sharing 2007-05-02 19:27:13 +02:00
pgtable.h [PATCH] i386: PARAVIRT: drop unused ptep_get_and_clear 2007-05-02 19:27:15 +02:00
poll.h
posix_types.h
processor-flags.h [PATCH] x86: Clean up x86 control register and MSR macros (corrected) 2007-05-02 19:27:12 +02:00
processor.h [PATCH] i386: Fix UP gdt bugs 2007-05-02 19:27:16 +02:00
ptrace-abi.h [PATCH] Split i386 and x86_64 ptrace.h 2006-09-26 08:49:10 -07:00
ptrace.h [PATCH] i386: Profile pc badness 2007-02-13 13:26:21 +01:00
reboot_fixups.h [PATCH] i386: clean up mach_reboot_fixups 2007-05-02 19:27:06 +02:00
reboot.h [PATCH] i386: Add machine_ops interface to abstract halting and rebooting 2007-05-02 19:27:11 +02:00
resource.h
rtc.h
rwlock.h [PATCH] i386: Clean up spin/rwlocks 2006-09-26 10:52:32 +02:00
rwsem.h [PATCH] lockdep: name some old style locks 2006-12-07 08:39:36 -08:00
scatterlist.h
seccomp.h
sections.h
segment.h [PATCH] i386: Fix UP gdt bugs 2007-05-02 19:27:16 +02:00
semaphore.h [PATCH] i386: Use early clobbers for semaphores now 2006-09-27 14:39:51 -07:00
sembuf.h
serial.h
setup.h [PATCH] i386: Remove extern declaration from mm/discontig.c, put in header. 2007-02-13 13:26:26 +01:00
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h
smp.h [PATCH] i386: Convert PDA into the percpu section 2007-05-02 19:27:16 +02:00
socket.h [NET]: Adding SO_TIMESTAMPNS / SCM_TIMESTAMPNS support 2007-04-25 22:24:21 -07:00
sockios.h [NET]: Introduce SIOCGSTAMPNS ioctl to get timestamps with nanosec resolution 2007-04-25 22:24:04 -07:00
sparsemem.h
spinlock_types.h [PATCH] Remove 'volatile' from spinlock_types 2006-12-06 14:39:53 -08:00
spinlock.h [PATCH] paravirt: Patch inline replacements for paravirt intercepts 2006-12-07 02:14:08 +01:00
srat.h
stacktrace.h [PATCH] i386: Do stacktracer conversion too 2006-09-26 10:52:34 +02:00
stat.h
statfs.h
string.h
suspend.h Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6 2006-12-07 08:59:11 -08:00
sync_bitops.h [PATCH] i386: fix typo in sync_constant_test_bit()'s name 2007-03-16 19:25:07 -07:00
system.h [PATCH] i386: rationalize paravirt wrappers 2007-05-02 19:27:10 +02:00
termbits.h [PATCH] tty: minor merge correction 2007-03-27 09:05:15 -07:00
termios.h [PATCH] consolidate line discipline number definitions 2007-02-11 10:51:26 -08:00
therm_throt.h [PATCH] x86: Add a cumulative thermal throttle event counter. 2006-09-26 10:52:42 +02:00
thread_info.h [PATCH] PM: Fix SMP races in the freezer 2006-12-13 09:05:49 -08:00
time.h [PATCH] vmi: pit override 2007-03-05 07:57:52 -08:00
timer.h [PATCH] i386: pit_latch_buggy has no effect 2007-05-02 19:27:05 +02:00
timex.h
tlb.h
tlbflush.h [PATCH] i386: PARAVIRT: add flush_tlb_others paravirt_op 2007-05-02 19:27:15 +02:00
topology.h [PATCH] sched: remove SMT nice 2007-03-05 07:57:51 -08:00
tsc.h [PATCH] x86: Log reason why TSC was marked unstable 2007-05-02 19:27:08 +02:00
types.h [PATCH] Centralise definitions of sector_t and blkcnt_t 2006-12-04 19:41:15 -08:00
uaccess.h [PATCH] i386: Update __copy_to_user_inatomic linuxdoc description 2007-05-02 19:27:06 +02:00
ucontext.h
unaligned.h
unistd.h [PATCH] remove kernel syscalls 2006-12-07 08:39:37 -08:00
unwind.h Remove stack unwinder for now 2006-12-15 08:47:51 -08:00
user.h
vga.h
vic.h [VOYAGER] fix up ptregs removal mess 2006-10-12 22:25:03 -05:00
vm86.h [PATCH] i386: Update sys_vm86 to cope with changed pt_regs and %gs usage 2006-12-07 02:14:03 +01:00
vmi_time.h [PATCH] i386: Convert VMI timer to use clock events 2007-05-02 19:27:16 +02:00
vmi.h [PATCH] vmi: apic ops 2007-03-05 07:57:52 -08:00
voyager.h [VOYAGER] fix up attribute packed specifiers in voyager.h 2006-10-12 22:23:18 -05:00
xor.h