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From: Marc Zyngier <>
To: Yun Wu <>,
	"" <>,
	"" <>
Cc: "" <>,
Subject: Re: [PATCH 5/5] irqchip: gicv3-its: add support for power down
Date: Fri, 30 Jan 2015 19:23:00 +0000	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 30/01/15 07:46, Yun Wu wrote:
> Configurations of an ITS cannot be changed if the ITS is in an
> active status, so it might not be safe to perform a soft reboot
> with all the active ITSes un-disabled, etc. kexec.
> This patch will make sure all the active ITSes disabled before
> enabling them again without resetting ITS hardware.

And what happens if the kernel crashes or gets rebooted from a watchdog?
Or if the bootloader messes things up? The ITS is in an unknown state
when we start again.

Wouldn't it be better to address this instead? Enforcing an safe initial
state seems a better solution that relying on mechanisms that may not be
relevant for all cases.


Jazz is not dead. It just smells funny...

  reply	other threads:[~2015-01-30 19:23 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-30  7:46 [PATCH 0/5] enhance configuring an ITS Yun Wu
2015-01-30  7:46 ` [PATCH 1/5] irqchip: gicv3-its: allocate proper size for DT Yun Wu
2015-01-30 19:10   ` Marc Zyngier
2015-01-31  1:57     ` Yun Wu (Abel)
2015-01-30  7:46 ` [PATCH 2/5] irqchip: gicv3-its: zero itt before handling to hardware Yun Wu
2015-01-30 19:24   ` Marc Zyngier
2015-01-30  7:46 ` [PATCH 3/5] irqchip: gicv3-its: use 64KB page as default granule Yun Wu
2015-01-30 19:18   ` Marc Zyngier
2015-01-31  1:33     ` Yun Wu (Abel)
2015-01-30  7:46 ` [PATCH 4/5] irqchip: gicv3-its: define macros for GITS_CTLR fields Yun Wu
2015-01-30  7:46 ` [PATCH 5/5] irqchip: gicv3-its: add support for power down Yun Wu
2015-01-30 19:23   ` Marc Zyngier [this message]
2015-01-31  1:43     ` Yun Wu (Abel)

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