From: Marc Zyngier <maz@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: "Thomas Gleixner" <tglx@linutronix.de>,
"Michael Ellerman" <mpe@ellerman.id.au>,
"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
"Paul Mackerras" <paulus@samba.org>,
"Ley Foon Tan" <ley.foon.tan@intel.com>,
"Chris Zankel" <chris@zankel.net>,
"Max Filippov" <jcmvbkbc@gmail.com>,
"Vineet Gupta" <vgupta@synopsys.com>,
"Thomas Bogendoerfer" <tsbogend@alpha.franken.de>,
"Robert Jarzmik" <robert.jarzmik@free.fr>,
"Russell King" <linux@armlinux.org.uk>,
"Krzysztof Kozlowski" <krzysztof.kozlowski@canonical.com>,
"Yoshinori Sato" <ysato@users.sourceforge.jp>,
"Rich Felker" <dalias@libc.org>,
"Geert Uytterhoeven" <geert@linux-m68k.org>,
"Alex Deucher" <alexander.deucher@amd.com>,
"Christian König" <christian.koenig@amd.com>,
"David Airlie" <airlied@linux.ie>,
"Daniel Vetter" <daniel@ffwll.ch>,
"Rob Clark" <robdclark@gmail.com>,
"Linus Walleij" <linus.walleij@linaro.org>,
"Lee Jones" <lee.jones@linaro.org>,
"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
"Rob Herring" <robh@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Bartosz Golaszewski" <bgolaszewski@baylibre.com>,
kernel-team@android.com
Subject: Re: [PATCH 00/39] irqdomain: Simplify interrupt handling
Date: Tue, 01 Jun 2021 15:29:14 +0100 [thread overview]
Message-ID: <87lf7t1ww5.wl-maz@kernel.org> (raw)
In-Reply-To: <20210520163751.27325-1-maz@kernel.org>
On Thu, 20 May 2021 17:37:12 +0100,
Marc Zyngier <maz@kernel.org> wrote:
>
> Although most device drivers only deal with an interrupt number, the
> core IRQ code is mostly concerned with the irq_desc structure that
> describes the full interrupt context (hierarchy, handlers, state).
>
> However, the low-level interrupt handling code that relies on the
> irqdomain abstraction has to perform an annoying dance to eventually
> get the core code to invoke interrupt handlers: the irqdomain code
> converts a low-level identifier to the unique Linux interrupt number,
> and the core code resolves this into an irq_desc pointer.
>
> Each of these two lookups ends-up parsing a radix tree (although the
> irqdomain code can use a linear mapping for the smallest domains),
> which is obviously one too many. Wouldn't it be nice if the irqdomain
> would cache the irq_desc instead of forcing the core code to look it
> up on each and every interrupt? This is what this long series is all
> about.
>
> There is roughly 3 parts here:
>
> - a substantial amount of massaging for some architectures (nios, mips
> and powerpc) to disentangle weird include constructs (asm/irq.h
> including linux/irqdomain.h is pretty bad...) and simplify bits of
> the irqdomain code
>
> - some rework of the irqdomain code to allow the caching of a irq_data
> pointer, unify the RCU behaviour and offer new APIs.
>
> - Perform a bulk of conversions that turn constructs similar to
> generic_handle_irq(irq_find_mapping(domain, hwirq)) into a simpler
> call to generic_handle_domain_irq(domain, hwirq). Yes, this is a
> mouthful.
>
> I've kept most of the conversions per-subsystem/per-arch in order to
> keep the number of patches low (though it is debatable whether I have
> succeeded).
>
> This ends up with a negative diffstat, so it can't be completely bad!
> Given the breadth of the changes, I do expect some breakage, although
> I've extensively compile-tested it and the kbuild robot has been
> invaluable in helping with the coverage.
Slight nudge in the direction of the cc'd arch maintainers. I'd like
to take the core of this series into -next (in practice, patches #1
through to #27). Any comment on the early, arch-specific patches would
be most welcome.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
prev parent reply other threads:[~2021-06-01 14:29 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-20 16:37 [PATCH 00/39] irqdomain: Simplify interrupt handling Marc Zyngier
2021-05-20 16:37 ` [PATCH 01/39] nios2: Do not include linux/irqdomain.h from asm/irq.h Marc Zyngier
2021-05-20 16:37 ` [PATCH 02/39] staging: octeon-hcd: Directly include linux/of.h Marc Zyngier
2021-05-20 16:37 ` [PATCH 03/39] mfd: ioc3: Directly include linux/irqdomain.h Marc Zyngier
2021-05-21 7:07 ` Lee Jones
2021-05-20 16:37 ` [PATCH 04/39] watchdog/octeon-wdt: " Marc Zyngier
2021-05-20 16:37 ` [PATCH 05/39] irqchip/mips-gic: " Marc Zyngier
2021-05-20 16:37 ` [PATCH 06/39] MIPS: lantiq: Directly include linux/of.h in xway/dma.c Marc Zyngier
2021-05-20 16:37 ` [PATCH 07/39] MIPS: Add missing linux/irqdomain.h includes Marc Zyngier
2021-05-20 16:37 ` [PATCH 08/39] MIPS: Do not include linux/irqdomain.h from asm/irq.h Marc Zyngier
2021-05-20 16:37 ` [PATCH 09/39] powerpc: Add missing linux/{of.h,irqdomain.h} include directives Marc Zyngier
2021-05-20 16:37 ` [PATCH 10/39] scsi/ibmvscsi: Directly include linux/{of.h,irqdomain.h} Marc Zyngier
2021-05-20 16:37 ` [PATCH 11/39] powerpc: Convert irq_domain_add_legacy_isa use to irq_domain_add_legacy Marc Zyngier
2021-05-20 16:37 ` [PATCH 12/39] powerpc: Drop dependency between asm/irq.h and linux/irqdomain.h Marc Zyngier
2021-05-20 16:37 ` [PATCH 13/39] irqdomain: Kill irq_domain_add_legacy_isa Marc Zyngier
2021-05-20 16:37 ` [PATCH 14/39] irqdomain: Reimplement irq_linear_revmap() with irq_find_mapping() Marc Zyngier
2021-05-20 16:37 ` [PATCH 15/39] powerpc: Move the use of irq_domain_add_nomap() behind a config option Marc Zyngier
2021-05-20 16:37 ` [PATCH 16/39] irqdomain: Make normal and nomap irqdomains exclusive Marc Zyngier
2021-11-15 19:05 ` Cédric Le Goater
2021-11-16 8:33 ` Marc Zyngier
2021-11-16 10:27 ` Cédric Le Goater
2021-05-20 16:37 ` [PATCH 17/39] irqdomain: Use struct_size() helper when allocating irqdomain Marc Zyngier
2021-05-20 16:37 ` [PATCH 18/39] irqdomain: Cache irq_data instead of a virq number in the revmap Marc Zyngier
2021-05-20 16:37 ` [PATCH 19/39] irqdomain: Implement irq_domain_clear_mapping() with irq_domain_set_mapping() Marc Zyngier
2021-05-20 16:37 ` [PATCH 20/39] irqdomain: Protect the linear revmap with RCU Marc Zyngier
2021-06-19 11:37 ` Thomas Gleixner
2021-05-20 16:37 ` [PATCH 21/39] irqdomain: Introduce irq_resolve_mapping() Marc Zyngier
2021-06-10 2:22 ` Qian Cai
2021-06-10 7:24 ` Marc Zyngier
2021-05-20 16:37 ` [PATCH 22/39] genirq: Use irq_resolve_mapping() to implement __handle_domain_irq() and co Marc Zyngier
2021-05-20 16:37 ` [PATCH 23/39] irqdesc: Fix __handle_domain_irq() comment Marc Zyngier
2021-05-20 16:37 ` [PATCH 24/39] irqchip/nvic: Convert from handle_IRQ() to handle_domain_irq() Marc Zyngier
2021-05-20 16:37 ` [PATCH 25/39] genirq: Add generic_handle_domain_irq() helper Marc Zyngier
2021-05-20 16:37 ` [PATCH 26/39] genirq: Move non-irqdomain handle_domain_irq() handling into ARM's handle_IRQ() Marc Zyngier
2021-05-20 16:37 ` [PATCH 27/39] irqchip: Bulk conversion to generic_handle_domain_irq() Marc Zyngier
2021-05-21 8:54 ` Geert Uytterhoeven
2021-05-21 21:10 ` Krzysztof Kozlowski
2021-05-20 16:37 ` [PATCH 28/39] gpio: " Marc Zyngier
2021-05-21 8:59 ` Geert Uytterhoeven
2021-05-20 16:37 ` [PATCH 29/39] pinctrl: " Marc Zyngier
2021-05-21 21:16 ` Krzysztof Kozlowski
2021-05-20 16:37 ` [PATCH 30/39] PCI: " Marc Zyngier
2021-05-20 17:47 ` Rob Herring
2021-05-24 8:38 ` Marc Zyngier
2021-05-24 13:28 ` Rob Herring
2021-05-24 15:06 ` Marc Zyngier
2021-05-21 8:57 ` Geert Uytterhoeven
2021-05-20 16:37 ` [PATCH 31/39] mfd: " Marc Zyngier
2021-05-21 7:06 ` Lee Jones
2021-05-20 16:37 ` [PATCH 32/39] gpu: " Marc Zyngier
2021-05-20 16:37 ` [PATCH 33/39] SH: " Marc Zyngier
2021-05-20 16:37 ` [PATCH 34/39] ARM: " Marc Zyngier
2021-05-20 18:04 ` Rob Herring
2021-05-24 8:32 ` Marc Zyngier
2021-05-21 21:17 ` Krzysztof Kozlowski
2021-05-20 16:37 ` [PATCH 35/39] mips: " Marc Zyngier
2021-05-20 16:37 ` [PATCH 36/39] arc: " Marc Zyngier
2021-06-01 18:00 ` Vineet Gupta
2021-05-20 16:37 ` [PATCH 37/39] xtensa: " Marc Zyngier
2021-05-20 16:37 ` [PATCH 38/39] nios2: " Marc Zyngier
2021-05-20 16:37 ` [PATCH 39/39] powerpc: " Marc Zyngier
2021-05-20 23:33 ` [PATCH 00/39] irqdomain: Simplify interrupt handling Linus Walleij
2021-05-24 8:53 ` Marc Zyngier
2021-05-24 9:39 ` Linus Walleij
2021-06-01 14:29 ` Marc Zyngier [this message]
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