From: Janosch Machowinski <scotch-cGBD8117FJM@public.gmane.org>
To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: Information regarding C3 cpu state and bus mastering activity
Date: Mon, 12 Dec 2005 13:47:39 +0100 [thread overview]
Message-ID: <439D716B.3010705@tzi.de> (raw)
In-Reply-To: <439CF197.3090902-3tLf1voIkJTQT0dZR+AlfA@public.gmane.org>
Phillip Susi wrote:
> I'm kind of confused as to why this is a problem myself. Yes, the CPU
> cache does not snoop the busmaster activity and so the cache can become
> out of sync with ram, but isn't it the job of the driver that initiates
> the dma transfer to invalidate those cache lines once the transfer is
> complete to bring the cache back into sync?
Normally a cache should be completely hidden from the system, so a
driver can never determine the actually state of the cache. Only way to
sync the cache is to completely flush it.
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next prev parent reply other threads:[~2005-12-12 12:47 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-11 20:10 Information regarding C3 cpu state and bus mastering activity Marco Calviani
[not found] ` <da5cd1900512111210k626ff691x-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2005-12-12 0:33 ` Janosch Machowinski
[not found] ` <439CC549.5060500-cGBD8117FJM@public.gmane.org>
2005-12-12 3:42 ` Phillip Susi
[not found] ` <439CF197.3090902-3tLf1voIkJTQT0dZR+AlfA@public.gmane.org>
2005-12-12 12:47 ` Janosch Machowinski [this message]
[not found] ` <439D716B.3010705-cGBD8117FJM@public.gmane.org>
2005-12-12 16:08 ` Phillip Susi
2005-12-12 9:22 ` Marco Calviani
[not found] ` <da5cd1900512120122y217541a2h-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2005-12-12 12:51 ` Janosch Machowinski
[not found] ` <439D726E.4020704-cGBD8117FJM@public.gmane.org>
2005-12-12 16:02 ` Marco Calviani
2005-12-12 16:10 ` Marco Calviani
[not found] ` <da5cd1900512120810v75dd8721t-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2005-12-13 2:08 ` phutchis-CWA4WttNNZF54TAoqtyWWQ
[not found] ` <200512130208.jBD280VU003725-2ArO/UEyFsZWk0Htik3J/w@public.gmane.org>
2005-12-13 20:52 ` Marco Calviani
2005-12-13 14:06 ` Pavel Machek
[not found] ` <20051213140624.GA13694-I/5MKhXcvmPrBKCeMvbIDA@public.gmane.org>
2005-12-14 11:58 ` Erik Slagter
2005-12-14 21:29 ` Marco Calviani
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