From: Daniel Lezcano <daniel.lezcano@linaro.org>
To: Michael Kelley <mikelley@microsoft.com>,
sthemmin@microsoft.com, kys@microsoft.com, wei.liu@kernel.org,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
hpa@zytor.com, arnd@arndb.de, linux-hyperv@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, x86@kernel.org, linux-arch@vger.kernel.org
Subject: Re: [PATCH v3 10/10] clocksource/drivers/hyper-v: Move handling of STIMER0 interrupts
Date: Tue, 2 Mar 2021 23:18:40 +0100 [thread overview]
Message-ID: <5495b52c-e619-90c4-0c4f-fdbde9e1ce58@linaro.org> (raw)
In-Reply-To: <1614721102-2241-11-git-send-email-mikelley@microsoft.com>
On 02/03/2021 22:38, Michael Kelley wrote:
> STIMER0 interrupts are most naturally modeled as per-cpu IRQs. But
> because x86/x64 doesn't have per-cpu IRQs, the core STIMER0 interrupt
> handling machinery is done in code under arch/x86 and Linux IRQs are
> not used. Adding support for ARM64 means adding equivalent code
> using per-cpu IRQs under arch/arm64.
>
> A better model is to treat per-cpu IRQs as the normal path (which it is
> for modern architectures), and the x86/x64 path as the exception. Do this
> by incorporating standard Linux per-cpu IRQ allocation into the main
> SITMER0 driver code, and bypass it in the x86/x64 exception case. For
> x86/x64, special case code is retained under arch/x86, but no STIMER0
> interrupt handling code is needed under arch/arm64.
>
> No functional change.
>
> Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
[ ... ]
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next prev parent reply other threads:[~2021-03-02 23:35 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 21:38 [PATCH v3 00/10] Refactor arch specific Hyper-V code Michael Kelley
2021-03-02 21:38 ` [PATCH v3 01/10] Drivers: hv: vmbus: Move Hyper-V page allocator to arch neutral code Michael Kelley
2021-03-02 21:38 ` [PATCH v3 02/10] x86/hyper-v: Move hv_message_type to architecture neutral module Michael Kelley
2021-03-02 21:38 ` [PATCH v3 03/10] Drivers: hv: Redo Hyper-V synthetic MSR get/set functions Michael Kelley
2021-03-02 21:38 ` [PATCH v3 04/10] Drivers: hv: vmbus: Move hyperv_report_panic_msg to arch neutral code Michael Kelley
2021-03-02 21:38 ` [PATCH v3 05/10] Drivers: hv: vmbus: Handle auto EOI quirk inline Michael Kelley
2021-03-02 21:38 ` [PATCH v3 06/10] Drivers: hv: vmbus: Move handling of VMbus interrupts Michael Kelley
2021-03-02 21:38 ` [PATCH v3 07/10] clocksource/drivers/hyper-v: Handle vDSO differences inline Michael Kelley
2021-03-02 22:14 ` Daniel Lezcano
2021-03-02 23:06 ` Michael Kelley
2021-03-08 13:49 ` Michael Kelley
2021-03-08 14:41 ` Daniel Lezcano
2021-03-02 21:38 ` [PATCH v3 08/10] clocksource/drivers/hyper-v: Handle sched_clock " Michael Kelley
2021-03-02 22:15 ` Daniel Lezcano
2021-03-02 21:38 ` [PATCH v3 09/10] clocksource/drivers/hyper-v: Set clocksource rating based on Hyper-V feature Michael Kelley
2021-03-02 21:38 ` [PATCH v3 10/10] clocksource/drivers/hyper-v: Move handling of STIMER0 interrupts Michael Kelley
2021-03-02 22:18 ` Daniel Lezcano [this message]
2021-03-08 16:48 ` [PATCH v3 00/10] Refactor arch specific Hyper-V code Wei Liu
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