From: Sumit Garg <sumit.garg@linaro.org>
To: Marc Zyngier <maz@kernel.org>
Cc: linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Russell King <linux@arm.linux.org.uk>,
Thomas Gleixner <tglx@linutronix.de>,
Jason Cooper <jason@lakedaemon.net>,
Valentin Schneider <Valentin.Schneider@arm.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Gregory Clement <gregory.clement@bootlin.com>,
Andrew Lunn <andrew@lunn.ch>,
kernel-team@android.com
Subject: Re: [PATCH v2 00/17] arm/arm64: Turning IPIs into normal interrupts
Date: Tue, 11 Aug 2020 18:45:21 +0530 [thread overview]
Message-ID: <CAFA6WYNw7TgypuEdOVRQ4QzAe6BbOg8V0_6O-Xb1=8xybse=nQ@mail.gmail.com> (raw)
In-Reply-To: <20200624195811.435857-1-maz@kernel.org>
Hi Marc,
On Thu, 25 Jun 2020 at 01:28, Marc Zyngier <maz@kernel.org> wrote:
>
> For as long as SMP ARM has existed, IPIs have been handled as
> something special. The arch code and the interrupt controller exchange
> a couple of hooks (one to generate an IPI, another to handle it).
>
> Although this is perfectly manageable, it prevents the use of features
> that we could use if IPIs were Linux IRQs (such as pseudo-NMIs). It
> also means that each interrupt controller driver has to follow an
> architecture-specific interface instead of just implementing the base
> irqchip functionalities. The arch code also duplicates a number of
> things that the core irq code already does (such as calling
> set_irq_regs(), irq_enter()...).
>
> This series tries to remedy this on arm/arm64 by offering a new
> registration interface where the irqchip gives the arch code a range
> of interrupts to use for IPIs. The arch code requests these as normal
> per-cpu interrupts.
>
> The bulk of the work is at the interrupt controller level, where all 5
> irqchips used on arm+SMP/arm64 get converted.
>
> Finally, we drop the legacy registration interface as well as the
> custom statistics accounting.
>
> Note that I have had a look at providing a "generic" interface by
> expanding the kernel/irq/ipi.c bag of helpers, but so far all
> irqchips have very different requirements, so there is hardly anything
> to consolidate for now. Maybe some as hip04 and the Marvell horror get
> cleaned up (the latter certainly could do with a good dusting).
>
> This has been tested on a bunch of 32 and 64bit guests (GICv2, GICv3),
> as well as 64bit bare metal (GICv3). The RPi part has only been tested
> in QEMU as a 64bit guest, while the HiSi and Marvell parts have only
> been compile-tested.
This series works perfectly fine on Developerbox.
I just want to follow-up regarding when you are planning to push this
series upstream? Are you waiting for other irqchips (apart from GIC)
to be reviewed?
Actually mine work to turn IPI as a pseudo NMI [1] is dependent on
this patch-set.
[1] https://lkml.org/lkml/2020/5/20/488
-Sumit
>
> * From v1:
> - Clarified the effect of nesting irq_enter/exit (Russell)
> - Changed the point where we tear IPIs down on (Valentin)
> - IPIs are no longer accessible from DT
> - HIP04 and Armada 370-XP have been converted, but are untested
> - arch-specific kstat accounting is removed
> - ARM's legacy interface is dropped
>
> Marc Zyngier (17):
> genirq: Add fasteoi IPI flow
> genirq: Allow interrupts to be excluded from /proc/interrupts
> arm64: Allow IPIs to be handled as normal interrupts
> ARM: Allow IPIs to be handled as normal interrupts
> irqchip/gic-v3: Describe the SGI range
> irqchip/gic-v3: Configure SGIs as standard interrupts
> irqchip/gic: Atomically update affinity
> irqchip/gic: Refactor SMP configuration
> irqchip/gic: Configure SGIs as standard interrupts
> irqchip/gic-common: Don't enable SGIs by default
> irqchip/bcm2836: Configure mailbox interrupts as standard interrupts
> irqchip/hip04: Configure IPIs as standard interrupts
> irqchip/armada-370-xp: Configure IPIs as standard interrupts
> arm64: Kill __smp_cross_call and co
> arm64: Remove custom IRQ stat accounting
> ARM: Kill __smp_cross_call and co
> ARM: Remove custom IRQ stat accounting
>
> arch/arm/Kconfig | 1 +
> arch/arm/include/asm/hardirq.h | 17 --
> arch/arm/include/asm/smp.h | 5 +-
> arch/arm/kernel/smp.c | 135 +++++++++-----
> arch/arm64/Kconfig | 1 +
> arch/arm64/include/asm/hardirq.h | 9 -
> arch/arm64/include/asm/irq_work.h | 4 +-
> arch/arm64/include/asm/smp.h | 6 +-
> arch/arm64/kernel/smp.c | 119 ++++++++-----
> drivers/irqchip/irq-armada-370-xp.c | 262 +++++++++++++++++++---------
> drivers/irqchip/irq-bcm2836.c | 151 +++++++++++++---
> drivers/irqchip/irq-gic-common.c | 3 -
> drivers/irqchip/irq-gic-v3.c | 99 ++++++-----
> drivers/irqchip/irq-gic.c | 183 ++++++++++---------
> drivers/irqchip/irq-hip04.c | 89 +++++-----
> include/linux/irq.h | 5 +-
> kernel/irq/chip.c | 27 +++
> kernel/irq/debugfs.c | 1 +
> kernel/irq/proc.c | 2 +-
> kernel/irq/settings.h | 7 +
> 20 files changed, 713 insertions(+), 413 deletions(-)
>
> --
> 2.27.0
>
next prev parent reply other threads:[~2020-08-11 13:15 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-24 19:57 [PATCH v2 00/17] arm/arm64: Turning IPIs into normal interrupts Marc Zyngier
2020-06-24 19:57 ` [PATCH v2 01/17] genirq: Add fasteoi IPI flow Marc Zyngier
2020-06-24 19:57 ` [PATCH v2 02/17] genirq: Allow interrupts to be excluded from /proc/interrupts Marc Zyngier
2020-06-24 19:57 ` [PATCH v2 03/17] arm64: Allow IPIs to be handled as normal interrupts Marc Zyngier
2020-06-25 18:25 ` Valentin Schneider
2020-07-10 19:58 ` Valentin Schneider
2020-06-24 19:57 ` [PATCH v2 04/17] ARM: " Marc Zyngier
2020-06-25 18:25 ` Valentin Schneider
2020-06-29 9:37 ` Marc Zyngier
2020-06-24 19:57 ` [PATCH v2 05/17] irqchip/gic-v3: Describe the SGI range Marc Zyngier
2020-06-24 19:58 ` [PATCH v2 06/17] irqchip/gic-v3: Configure SGIs as standard interrupts Marc Zyngier
2020-06-25 18:25 ` Valentin Schneider
2020-06-30 10:15 ` Marc Zyngier
2020-07-02 13:23 ` Valentin Schneider
2020-07-02 13:48 ` Marc Zyngier
2020-07-02 14:24 ` Valentin Schneider
2020-06-24 19:58 ` [PATCH v2 07/17] irqchip/gic: Atomically update affinity Marc Zyngier
2020-07-01 19:33 ` Sasha Levin
2020-07-10 14:02 ` Sasha Levin
2021-09-09 15:22 ` Geert Uytterhoeven
2021-09-09 15:37 ` Russell King (Oracle)
2021-09-10 10:22 ` Marc Zyngier
2021-09-10 13:19 ` Geert Uytterhoeven
2021-09-11 2:49 ` Magnus Damm
2021-09-11 19:32 ` Marc Zyngier
2021-09-12 5:40 ` Magnus Damm
2021-09-13 8:05 ` Geert Uytterhoeven
2021-09-15 3:28 ` Magnus Damm
2021-09-22 13:53 ` [irqchip: irq/irqchip-fixes] irqchip/gic: Work around broken Renesas integration irqchip-bot for Marc Zyngier
2020-06-24 19:58 ` [PATCH v2 08/17] irqchip/gic: Refactor SMP configuration Marc Zyngier
2020-06-24 19:58 ` [PATCH v2 09/17] irqchip/gic: Configure SGIs as standard interrupts Marc Zyngier
2020-06-24 19:58 ` [PATCH v2 10/17] irqchip/gic-common: Don't enable SGIs by default Marc Zyngier
2020-06-24 19:58 ` [PATCH v2 11/17] irqchip/bcm2836: Configure mailbox interrupts as standard interrupts Marc Zyngier
2020-06-24 19:58 ` [PATCH v2 12/17] irqchip/hip04: Configure IPIs " Marc Zyngier
2020-06-24 19:58 ` [PATCH v2 13/17] irqchip/armada-370-xp: " Marc Zyngier
2020-06-24 19:58 ` [PATCH v2 14/17] arm64: Kill __smp_cross_call and co Marc Zyngier
2020-06-25 18:25 ` Valentin Schneider
2020-07-02 13:37 ` Marc Zyngier
2020-06-24 19:58 ` [PATCH v2 15/17] arm64: Remove custom IRQ stat accounting Marc Zyngier
2020-06-25 18:26 ` Valentin Schneider
2020-06-26 11:58 ` Marc Zyngier
2020-06-26 23:15 ` Valentin Schneider
2020-06-27 11:42 ` Marc Zyngier
2020-07-10 19:58 ` Valentin Schneider
2020-06-24 19:58 ` [PATCH v2 16/17] ARM: Kill __smp_cross_call and co Marc Zyngier
2020-06-24 19:58 ` [PATCH v2 17/17] ARM: Remove custom IRQ stat accounting Marc Zyngier
2020-06-25 18:24 ` [PATCH v2 00/17] arm/arm64: Turning IPIs into normal interrupts Valentin Schneider
2020-07-10 19:58 ` Valentin Schneider
2020-08-11 13:15 ` Sumit Garg [this message]
2020-08-11 13:58 ` Marc Zyngier
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