From: grundler@dsl2.external.hp.com (Grant Grundler)
To: "David S. Miller" <davem@redhat.com>
Cc: jsm@udlkern.fc.hp.com, parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] Re: RFC: mmap patch
Date: Sat, 8 Mar 2003 10:24:39 -0700 [thread overview]
Message-ID: <20030308172439.GA10161@dsl2.external.hp.com> (raw)
In-Reply-To: <20030307.222945.32673395.davem@redhat.com>
On Fri, Mar 07, 2003 at 10:29:45PM -0800, David S. Miller wrote:
> If you flush caches exactly what sparc64 does in 2.5.x, and you do
> have a virtually indexed, physically tagged cache, you should have no
> correctness.
After getting some sleep and thinking about how IOMMUs work on parisc,
I've convinced myself the CPU caches are virtually tagged and
virtually indexed. Part of the IOMMU function is to provide the
virtual address tag/index bits in order to acquire cacheline ownership
on behalf of the device doing DMA. I don't know exactly how that
matters to the VM design, but it seems relevant that parisc is not
physically indexed.
thanks,
grant
next prev parent reply other threads:[~2003-03-08 17:24 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-06 14:14 [parisc-linux] Re: RFC: mmap patch John Marvin
2003-03-06 14:31 ` Matthew Wilcox
2003-03-06 15:31 ` Randolph Chung
2003-03-08 6:30 ` Grant Grundler
2003-03-08 6:29 ` David S. Miller
2003-03-08 17:24 ` Grant Grundler [this message]
2003-03-08 19:04 ` David S. Miller
2003-03-08 20:42 ` Grant Grundler
2003-03-08 22:45 ` Matthew Wilcox
2003-03-08 23:00 ` David S. Miller
2003-03-08 23:27 ` Matthew Wilcox
2003-03-08 23:14 ` David S. Miller
2003-03-08 23:31 ` Randolph Chung
2003-03-08 23:15 ` David S. Miller
2003-03-09 2:15 ` Grant Grundler
2003-03-08 23:11 ` Matthew Wilcox
2003-03-08 23:02 ` David S. Miller
2003-03-09 14:42 ` Matthew Wilcox
2003-03-09 21:38 ` David S. Miller
2003-03-10 1:50 ` Matthew Wilcox
2003-03-10 5:18 ` David S. Miller
2003-03-14 13:04 ` Jochen Friedrich
2003-03-14 16:23 ` Grant Grundler
-- strict thread matches above, loose matches on Subject: below --
2003-03-09 3:42 John Marvin
2003-03-09 21:29 ` David S. Miller
2003-03-09 3:51 John Marvin
2003-03-09 21:31 ` David S. Miller
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