From: Marc Zyngier <maz@kernel.org>
To: Mark Rutland <mark.rutland@arm.com>
Cc: Arnd Bergmann <arnd@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Hector Martin <marcan@marcan.st>,
linux-kernel@vger.kernel.org,
Mohamed Mediouni <mohamed.mediouni@caramail.com>,
Will Deacon <will@kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Stan Skowronek <stan@corellium.com>
Subject: Re: [RFC PATCH 7/7] irqchip/apple-aic: add SMP support to the Apple AIC driver.
Date: Thu, 21 Jan 2021 14:05:27 +0000 [thread overview]
Message-ID: <6d4d606cd832230c159b12874d32e220@kernel.org> (raw)
In-Reply-To: <20210121133235.GG48431@C02TD0UTHF1T.local>
On 2021-01-21 13:32, Mark Rutland wrote:
> On Thu, Jan 21, 2021 at 01:22:37PM +0000, Marc Zyngier wrote:
>> On 2021-01-21 12:50, Mohamed Mediouni wrote:
>> > > On 21 Jan 2021, at 13:44, Arnd Bergmann <arnd@kernel.org> wrote:
>> > >
>> > > On Wed, Jan 20, 2021 at 2:27 PM Mohamed Mediouni
>>
>> [...]
>>
>> > > > + aic.fast_ipi = of_property_read_bool(node, "fast-ipi");
>> > >
>> > > Where is this property documented, and what decides which one to use?
>> > It’s getting documented in the next patch set.
>> >
>> > This property is there to enable support for older iPhone processors
>> > later on, some of which do not have fast IPI support.
>> >
>> > On Apple M1, fast-ipi is always on.
>>
>> Then please focus on a single implementation. Additional features can
>> always be merged later once something is up and running.
>>
>> Also, there sysregs can be detected by matching the MIDR, so I don't
>> think we need a DT property for that.
>
> Generally we do not detect IMP-DEF sysregs based on MIDR because they
> won't necessarily be exposed to a VM, so I suspect that we do need DT
> properties to describe that IMP-DEF sysregs are accessible, and should
> not rely on the MIDR alone. Maybe that's implicit in another property,
> but worth bearing in mind.
Hmm. That's a good point. I think this could be keyed off
the compatible property, which should accurately reflect
the version of the interrupt controller.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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next prev parent reply other threads:[~2021-01-21 14:07 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-20 13:27 [RFC PATCH 0/7] Linux on Apple Silicon Mohamed Mediouni
2021-01-20 13:27 ` [RFC PATCH 1/7] arm64: kernel: FIQ support Mohamed Mediouni
2021-01-20 13:27 ` [RFC PATCH 2/7] arm64: kernel: Add a WFI hook Mohamed Mediouni
2021-01-20 16:46 ` Alexander Graf
[not found] ` <94C20F55-D3B8-4349-B26F-9EA8AAEBF639@caramail.com>
2021-01-21 12:33 ` Hector Martin 'marcan'
2021-01-21 10:52 ` Arnd Bergmann
2021-01-21 11:01 ` Mohamed Mediouni
2021-01-21 11:36 ` Arnd Bergmann
2021-01-20 13:27 ` [RFC PATCH 3/7] arm64: mm: use nGnRnE instead of nGnRE on Apple processors Mohamed Mediouni
2021-01-20 16:47 ` Alexander Graf
2021-01-20 18:06 ` Mohamed Mediouni
2021-01-20 18:10 ` Alexander Graf
2021-01-21 11:27 ` Will Deacon
2021-01-21 11:38 ` Arnd Bergmann
2021-01-21 11:44 ` Marc Zyngier
2021-01-21 12:47 ` Will Deacon
2021-01-21 15:12 ` Mohamed Mediouni
2021-01-21 16:25 ` Marc Zyngier
2021-01-21 17:55 ` Will Deacon
2021-01-21 18:15 ` Marc Zyngier
2021-01-21 18:22 ` Mohamed Mediouni
2021-01-21 18:22 ` Will Deacon
2021-01-20 13:27 ` [RFC PATCH 4/7] irqchip/apple-aic: Add support for Apple AIC Mohamed Mediouni
2021-01-20 17:11 ` Alexander Graf
2021-01-20 18:04 ` Mohamed Mediouni
2021-01-20 20:16 ` Andrew Lunn
2021-01-20 21:18 ` Stan Skowronek
2021-01-21 9:48 ` Linus Walleij
2021-01-21 10:37 ` Arnd Bergmann
2021-01-21 15:29 ` Hector Martin 'marcan'
2021-01-21 17:09 ` Rob Herring
2021-01-21 17:45 ` Rob Herring
2021-01-21 16:44 ` Rob Herring
2021-01-21 16:53 ` Hector Martin 'marcan'
2021-01-20 13:27 ` [RFC PATCH 5/7] arm64/Kconfig: Add Apple Silicon SoC platform Mohamed Mediouni
2021-01-20 13:27 ` [RFC PATCH 6/7] arm64: kernel: Apple CPU start driver Mohamed Mediouni
2021-01-21 11:14 ` Arnd Bergmann
2021-01-20 13:27 ` [RFC PATCH 7/7] irqchip/apple-aic: add SMP support to the Apple AIC driver Mohamed Mediouni
2021-01-21 12:44 ` Arnd Bergmann
2021-01-21 12:50 ` Mohamed Mediouni
2021-01-21 13:00 ` Arnd Bergmann
2021-01-21 13:01 ` Hector Martin 'marcan'
2021-01-21 13:22 ` Marc Zyngier
2021-01-21 13:32 ` Mark Rutland
2021-01-21 14:05 ` Marc Zyngier [this message]
2021-01-21 13:34 ` Mohamed Mediouni
2021-01-21 14:10 ` Marc Zyngier
2021-01-21 15:09 ` Arnd Bergmann
2021-01-21 15:18 ` Mohamed Mediouni
2021-01-21 16:40 ` Rob Herring
2021-01-21 16:43 ` Mohamed Mediouni
2021-01-21 17:37 ` Rob Herring
2021-01-21 18:08 ` Mohamed Mediouni
2021-01-21 18:57 ` Rob Herring
2021-02-02 19:15 ` Linus Walleij
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