From: marc.zyngier@arm.com (Marc Zyngier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 0/4] genirq: handling GIC per-cpu interrupts
Date: Mon, 3 Oct 2011 18:04:02 +0100 [thread overview]
Message-ID: <1317661446-2876-1-git-send-email-marc.zyngier@arm.com> (raw)
The current GIC per-cpu interrupts (aka PPIs) suffer from a number of
problems:
- They use a completely separate scheme to handle the interrupts,
mostly because the PPI concept doesn't really match the kernel view
of an interrupt.
- PPIs can only be used by the timer code, unless we add more low-level
assembly code.
- The local timer code can only be used by devices generating PPIs,
and not SPIs.
- At least one platform (msm) has started implementing its own
alternative scheme.
- Some low-level code gets duplicated, as usual...
The proposed solution is to handle the PPIs using the same path as
SPIs. A new core API is added to deal with per-cpu interrupts in a
less awkward way. The local timer code is updated to reflect these
changes.
The core API changes are based on an initial idea by Thomas Gleixner.
Tested on ARM Versatile Express (Cortex A15), ARM RealView PB11MP,
OMAP4 (Panda) and Tegra (Harmony). Patch series against next-20110930.
The two first patches can also be found in Thomas' tree:
git://tesla.tglx.de/git/linux-2.6-tip irq/core
Changelog:
next reply other threads:[~2011-10-03 17:04 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-03 17:04 Marc Zyngier [this message]
2011-10-03 17:04 ` [PATCH v4 1/4] genirq: Add support for per-cpu dev_id interrupts Marc Zyngier
2011-10-03 17:04 ` [PATCH v4 2/4] genirq: percpu: allow interrupt type to be set at enable time Marc Zyngier
2011-10-03 17:04 ` [PATCH v4 3/4] ARM: gic: consolidate PPI handling Marc Zyngier
2011-10-03 17:04 ` [PATCH v4 4/4] ARM: gic, local timers: use the request_percpu_irq() interface Marc Zyngier
2011-10-13 18:14 ` [PATCH v4 0/4] genirq: handling GIC per-cpu interrupts Russell King - ARM Linux
2011-10-14 12:41 ` Marc Zyngier
2011-10-18 12:39 ` Marc Zyngier
2011-10-20 7:37 ` Shawn Guo
2011-10-20 8:21 ` Russell King - ARM Linux
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