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linux-next/arch
Thomas Gleixner a31e58e129 x86/apic: Switch all APICs to Fixed delivery mode
Some of the APIC incarnations are operating in lowest priority delivery
mode. This worked as long as the vector management code allocated the same
vector on all possible CPUs for each interrupt.

Lowest priority delivery mode does not necessarily respect the affinity
setting and may redirect to some other online CPU. This was documented
somewhere in the old code and the conversion to single target delivery
missed to update the delivery mode of the affected APIC drivers which
results in spurious interrupts on some of the affected CPU/Chipset
combinations.

Switch the APIC drivers over to Fixed delivery mode and remove all
leftovers of lowest priority delivery mode.

Switching to Fixed delivery mode is not a problem on these CPUs because the
kernel already uses Fixed delivery mode for IPIs. The reason for this is
that th SDM explicitely forbids lowest prio mode for IPIs. The reason is
obvious: If the irq routing does not honor destination targets in lowest
prio mode then an IPI targeted at CPU1 might end up on CPU0, which would be
a fatal problem in many cases.

As a consequence of this change, the apic::irq_delivery_mode field is now
pointless, but this needs to be cleaned up in a separate patch.

Fixes: fdba46ffb4 ("x86/apic: Get rid of multi CPU affinity")
Reported-by: vcaputo@pengaru.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: vcaputo@pengaru.com
Cc: Pavel Machek <pavel@ucw.cz>
Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1712281140440.1688@nanos
2017-12-29 14:20:48 +01:00
..
alpha Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
arc Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
arm Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
arm64 Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:33:11 -08:00
blackfin Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
c6x License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
cris License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
frv License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
h8300 License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
hexagon Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
ia64 Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
m32r Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
m68k Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
metag Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
microblaze License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
mips Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
mn10300 Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
nios2 License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
openrisc OpenRISC updates for v4.15 2017-11-13 12:12:00 -08:00
parisc Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
powerpc Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
s390 Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
score License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
sh Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
sparc Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
tile Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
um Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
unicore32 License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
x86 x86/apic: Switch all APICs to Fixed delivery mode 2017-12-29 14:20:48 +01:00
xtensa Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
.gitignore
Kconfig Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00