kernel_optimize_test/kernel/irq
Marc Zyngier 0be8153cbc genirq/msi: Allow level-triggered MSIs to be exposed by MSI providers
So far, MSIs have been used to signal edge-triggered interrupts, as
a write is a good model for an edge (you can't "unwrite" something).
On the other hand, routing zillions of wires in an SoC because you
need level interrupts is a bit extreme.

People have come up with a variety of schemes to support this, which
involves sending two messages: one to signal the interrupt, and one
to clear it. Since the kernel cannot represent this, we've ended up
with side-band mechanisms that are pretty awful.

Instead, let's acknoledge the requirement, and ensure that, under the
right circumstances, the irq_compose_msg and irq_write_msg can take
as a parameter an array of two messages instead of a pointer to a
single one. We also add some checking that the compose method only
clobbers the second message if the MSI domain has been created with
the MSI_FLAG_LEVEL_CAPABLE flags.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Rob Herring <robh@kernel.org>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lkml.kernel.org/r/20180508121438.11301-2-marc.zyngier@arm.com
2018-05-13 15:58:59 +02:00
..
affinity.c genirq/affinity: Spread irq vectors among present CPUs as far as possible 2018-04-06 12:19:51 +02:00
autoprobe.c genirq: Cleanup top of file comments 2018-03-20 14:23:27 +01:00
chip.c genirq: Add missing SPDX identifiers 2018-03-20 14:23:28 +01:00
cpuhotplug.c genirq: Add missing SPDX identifiers 2018-03-20 14:23:28 +01:00
debug.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk 2018-02-01 13:36:15 -08:00
debugfs.c genirq: Remove license boilerplate/references 2018-03-20 14:23:28 +01:00
devres.c genirq: Add missing SPDX identifiers 2018-03-20 14:23:28 +01:00
dummychip.c genirq: Add missing SPDX identifiers 2018-03-20 14:23:28 +01:00
generic-chip.c genirq: Add missing SPDX identifiers 2018-03-20 14:23:28 +01:00
handle.c genirq: Add missing SPDX identifiers 2018-03-20 14:23:28 +01:00
internals.h genirq: Make legacy autoprobing work again 2018-02-01 11:09:40 +01:00
ipi.c genirq: Add missing SPDX identifiers 2018-03-20 14:23:28 +01:00
irq_sim.c genirq/irq_sim: Remove the license boilerplate 2018-04-26 22:26:39 +02:00
irqdesc.c genirq: Add missing SPDX identifiers 2018-03-20 14:23:28 +01:00
irqdomain.c genirq: Add missing SPDX identifiers 2018-03-20 14:23:28 +01:00
Kconfig genirq: Make GENERIC_IRQ_MULTI_HANDLER depend on !MULTI_IRQ_HANDLER 2018-04-04 12:04:28 +02:00
Makefile 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
manage.c genirq: Add missing SPDX identifiers 2018-03-20 14:23:28 +01:00
matrix.c genirq/matrix: Cleanup SPDX identifier 2018-03-20 14:23:28 +01:00
migration.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
msi.c genirq/msi: Allow level-triggered MSIs to be exposed by MSI providers 2018-05-13 15:58:59 +02:00
pm.c genirq: Add missing SPDX identifiers 2018-03-20 14:23:28 +01:00
proc.c genirq: Cleanup top of file comments 2018-03-20 14:23:27 +01:00
resend.c genirq: Cleanup top of file comments 2018-03-20 14:23:27 +01:00
settings.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
spurious.c genirq: Cleanup top of file comments 2018-03-20 14:23:27 +01:00
timings.c genirq: Remove license boilerplate/references 2018-03-20 14:23:28 +01:00