From: "David S. Miller" <davem@davemloft.net>
To: sparclinux@vger.kernel.org
Subject: Re: hypersparc dvma aliasing
Date: Wed, 17 Nov 2004 06:11:17 +0000 [thread overview]
Message-ID: <20041116221117.65c93cea.davem@davemloft.net> (raw)
In-Reply-To: <419AB742.1000103@mc.net>
On Tue, 16 Nov 2004 20:28:18 -0600
Bob Breuer <breuerr@mc.net> wrote:
> After further testing, it certainly seems that hypersparcs
> have aliasing issues between dvma and physical addresses.
>
> Here are some results that I get using a minimum of cache
> flushing with 512K of cache, and all dvma areas are cacheable:
>
> iommu_get_one -- cache(va) = cache(pa):
> va 0xf0777000, pa 0x00777000, dvma 0xf0010000 -- fails
> va 0xf0777000, pa 0x00777000, dvma 0xf0777000 -- works
>
> iommu_map_dma_area -- cache(va) != cache(addr):
> va 0xfbd66000, addr 0xfff0e000, pba 0xf0066000 -- fails
> va 0xfbd80000, addr 0xfff00000, pba 0xf0000000 -- works
> va 0xfbd66000, addr 0xfff0e000, pba 0xf010e000 -- works
You've certainly disproven all the theories in my previous
email on this topic :-) Good work Bob!
next prev parent reply other threads:[~2004-11-17 6:11 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-17 2:28 hypersparc dvma aliasing Bob Breuer
2004-11-17 3:35 ` Bob Breuer
2004-11-17 3:47 ` William Lee Irwin III
2004-11-17 6:11 ` David S. Miller [this message]
2004-11-23 6:18 ` Bob Breuer
2004-11-23 7:37 ` David S. Miller
2004-11-23 14:28 ` Stan Benoit
2004-11-23 15:35 ` Bob Breuer
2004-11-23 23:21 ` Stan Benoit
2004-11-24 16:54 ` William Lee Irwin III
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