From: Segher Boessenkool <segher@kernel.crashing.org>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
James Bottomley <James.Bottomley@steeleye.com>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
Alessandro Rubini <rubini@vision.unipv.it>,
linuxppc-dev@ozlabs.org, Paul Mackerras <paulus@samba.org>,
Jens Axboe <jens.axboe@oracle.com>,
Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Subject: Re: [patch 5/6] ps3: BD/DVD/CD-ROM Storage Driver
Date: Mon, 16 Jul 2007 14:08:57 +0200 [thread overview]
Message-ID: <0A74AFF2-CBDA-4B00-AF5F-B6C6DACE0E16@kernel.crashing.org> (raw)
In-Reply-To: <1184368328.6059.271.camel@localhost.localdomain>
>> I'm pretty sure that no ppc64 machine needs alias resolution in
>> the kernel,
>> although some are VIPT. Last time we discussed this, Segher
>> explained it
>> to me, but I don't remember which way Cell does it. IIRC, it
>> automatically
>> flushes cache lines that are accessed through aliases.
>
> Ah yes, I remember reading about this automatic flushing thing. I
> don't
> know how the caches actually work on most of our PPC's, but the
> fact is,
> we don't have aliasing issues, so I can safely ignore it for a bit
> longer :-)
That is the very short version of the story, yes: some
PowerPC implementations are VIPT physically, but there
are no aliasing issues we have to worry about.
Anyone interested in how this works, can download the
PPC970 UM (or 970FX or 970MP); it has a very detailed
explanation of all this. Cell might be slightly different
but the base idea is the same.
Segher
next prev parent reply other threads:[~2007-07-16 12:10 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-04 13:22 [patch 0/6] PS3 Storage Drivers for 2.6.23, take 4 Geert Uytterhoeven
2007-07-04 13:22 ` [patch 1/6] ps3: Preallocate bootmem memory for the PS3 FLASH ROM storage driver Geert Uytterhoeven
2007-07-04 13:22 ` [patch 2/6] ps3: Storage Driver Core Geert Uytterhoeven
2007-07-04 13:22 ` [patch 3/6] ps3: Storage device registration routines Geert Uytterhoeven
2007-07-04 13:22 ` [patch 4/6] ps3: Disk Storage Driver Geert Uytterhoeven
2007-07-04 13:22 ` [patch 5/6] ps3: BD/DVD/CD-ROM " Geert Uytterhoeven
2007-07-13 13:02 ` James Bottomley
2007-07-13 13:05 ` Jens Axboe
2007-07-13 13:25 ` Geert Uytterhoeven
2007-07-13 13:34 ` James Bottomley
2007-07-13 13:45 ` Geert Uytterhoeven
2007-07-13 14:02 ` James Bottomley
2007-07-13 14:19 ` Arnd Bergmann
2007-07-13 15:10 ` Geert Uytterhoeven
2007-07-13 15:28 ` James Bottomley
2007-07-13 20:13 ` Geert Uytterhoeven
2007-07-16 11:43 ` Geert Uytterhoeven
2007-07-16 12:16 ` Jens Axboe
2007-07-16 12:59 ` Geert Uytterhoeven
2007-07-16 13:04 ` Jens Axboe
2007-07-16 13:24 ` Geert Uytterhoeven
2007-07-16 13:33 ` Jens Axboe
2007-07-16 21:38 ` Benjamin Herrenschmidt
2007-07-16 13:47 ` James Bottomley
2007-07-16 14:38 ` Jens Axboe
2007-07-16 14:59 ` Geert Uytterhoeven
2007-07-16 21:40 ` Benjamin Herrenschmidt
2007-07-16 21:49 ` Benjamin Herrenschmidt
2007-07-16 22:03 ` James Bottomley
2007-07-16 22:12 ` Benjamin Herrenschmidt
2007-07-13 16:35 ` Jens Axboe
2007-07-13 23:12 ` Benjamin Herrenschmidt
2007-07-16 12:08 ` Segher Boessenkool [this message]
2007-07-13 14:51 ` Jens Axboe
2007-07-13 23:06 ` Benjamin Herrenschmidt
2007-07-04 13:22 ` [patch 6/6] ps3: FLASH ROM " Geert Uytterhoeven
2007-07-10 7:45 ` [patch 0/6] PS3 Storage Drivers for 2.6.23, take 4 Geert Uytterhoeven
2007-07-10 7:55 ` Jens Axboe
2007-07-10 8:01 ` Paul Mackerras
2007-07-10 8:32 ` Jens Axboe
2007-07-13 9:31 ` Geert Uytterhoeven
2007-07-13 12:27 ` PS3 Storage Driver O_DIRECT issue Olaf Hering
2007-07-13 13:34 ` Geert Uytterhoeven
2007-07-17 16:40 ` Geoff Levand
2007-07-18 16:12 ` Geert Uytterhoeven
2007-07-18 17:57 ` Jens Axboe
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