From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linuxppc-dev@ozlabs.org,
James Bottomley <James.Bottomley@steeleye.com>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
Alessandro Rubini <rubini@vision.unipv.it>,
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: Sat, 14 Jul 2007 09:12:08 +1000 [thread overview]
Message-ID: <1184368328.6059.271.camel@localhost.localdomain> (raw)
In-Reply-To: <200707131619.54898.arnd@arndb.de>
On Fri, 2007-07-13 at 16:19 +0200, Arnd Bergmann wrote:
> 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 :-)
There are some aliasing issues with the instruction cache specifically
on some 4xx models but that's irrelevant to this discussion (and I think
we handle them elsewhere anyway).
Ben.
WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: 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: Sat, 14 Jul 2007 09:12:08 +1000 [thread overview]
Message-ID: <1184368328.6059.271.camel@localhost.localdomain> (raw)
In-Reply-To: <200707131619.54898.arnd@arndb.de>
On Fri, 2007-07-13 at 16:19 +0200, Arnd Bergmann wrote:
> 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 :-)
There are some aliasing issues with the instruction cache specifically
on some 4xx models but that's irrelevant to this discussion (and I think
we handle them elsewhere anyway).
Ben.
next prev parent reply other threads:[~2007-07-13 23:12 UTC|newest]
Thread overview: 103+ 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 ` Geert Uytterhoeven
2007-07-04 13:22 ` 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 ` Geert Uytterhoeven
2007-07-04 13:22 ` Geert Uytterhoeven
2007-07-04 13:22 ` [patch 2/6] ps3: Storage Driver Core Geert Uytterhoeven
2007-07-04 13:22 ` Geert Uytterhoeven
2007-07-04 13:22 ` Geert Uytterhoeven
2007-07-04 13:22 ` [patch 3/6] ps3: Storage device registration routines Geert Uytterhoeven
2007-07-04 13:22 ` Geert Uytterhoeven
2007-07-04 13:22 ` Geert Uytterhoeven
2007-07-04 13:22 ` [patch 4/6] ps3: Disk Storage Driver Geert Uytterhoeven
2007-07-04 13:22 ` Geert Uytterhoeven
2007-07-04 13:22 ` Geert Uytterhoeven
2007-07-04 13:22 ` [patch 5/6] ps3: BD/DVD/CD-ROM " Geert Uytterhoeven
2007-07-04 13:22 ` Geert Uytterhoeven
2007-07-04 13:22 ` Geert Uytterhoeven
2007-07-13 13:02 ` James Bottomley
2007-07-13 13:02 ` James Bottomley
2007-07-13 13:05 ` Jens Axboe
2007-07-13 13:05 ` Jens Axboe
2007-07-13 13:25 ` Geert Uytterhoeven
2007-07-13 13:25 ` Geert Uytterhoeven
2007-07-13 13:34 ` James Bottomley
2007-07-13 13:34 ` James Bottomley
2007-07-13 13:45 ` Geert Uytterhoeven
2007-07-13 13:45 ` Geert Uytterhoeven
2007-07-13 13:45 ` Geert Uytterhoeven
2007-07-13 14:02 ` James Bottomley
2007-07-13 14:02 ` James Bottomley
2007-07-13 14:19 ` Arnd Bergmann
2007-07-13 14:19 ` Arnd Bergmann
2007-07-13 14:19 ` Arnd Bergmann
2007-07-13 15:10 ` Geert Uytterhoeven
2007-07-13 15:10 ` Geert Uytterhoeven
2007-07-13 15:28 ` James Bottomley
2007-07-13 15:28 ` James Bottomley
2007-07-13 20:13 ` Geert Uytterhoeven
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 21:38 ` Benjamin Herrenschmidt
2007-07-16 13:47 ` James Bottomley
2007-07-16 13:47 ` James Bottomley
2007-07-16 14:38 ` Jens Axboe
2007-07-16 14:38 ` Jens Axboe
2007-07-16 14:59 ` Geert Uytterhoeven
2007-07-16 21:40 ` Benjamin Herrenschmidt
2007-07-16 21:40 ` Benjamin Herrenschmidt
2007-07-16 21:49 ` Benjamin Herrenschmidt
2007-07-16 21:49 ` Benjamin Herrenschmidt
2007-07-16 22:03 ` James Bottomley
2007-07-16 22:03 ` James Bottomley
2007-07-16 22:12 ` Benjamin Herrenschmidt
2007-07-16 22:12 ` Benjamin Herrenschmidt
2007-07-13 16:35 ` Jens Axboe
2007-07-13 16:35 ` Jens Axboe
2007-07-13 23:12 ` Benjamin Herrenschmidt [this message]
2007-07-13 23:12 ` Benjamin Herrenschmidt
2007-07-16 12:08 ` Segher Boessenkool
2007-07-16 12:08 ` Segher Boessenkool
2007-07-13 14:51 ` Jens Axboe
2007-07-13 14:51 ` Jens Axboe
2007-07-13 23:06 ` Benjamin Herrenschmidt
2007-07-13 23:06 ` Benjamin Herrenschmidt
2007-07-04 13:22 ` [patch 6/6] ps3: FLASH ROM " Geert Uytterhoeven
2007-07-04 13:22 ` Geert Uytterhoeven
2007-07-04 13:22 ` Geert Uytterhoeven
2007-07-10 7:45 ` [patch 0/6] PS3 Storage Drivers for 2.6.23, take 4 Geert Uytterhoeven
2007-07-10 7:45 ` Geert Uytterhoeven
2007-07-10 7:55 ` Jens Axboe
2007-07-10 7:55 ` Jens Axboe
2007-07-10 7:55 ` Jens Axboe
2007-07-10 8:01 ` Paul Mackerras
2007-07-10 8:01 ` Paul Mackerras
2007-07-10 8:01 ` Paul Mackerras
2007-07-10 8:32 ` Jens Axboe
2007-07-10 8:32 ` Jens Axboe
2007-07-13 9:31 ` Geert Uytterhoeven
2007-07-13 9:31 ` Geert Uytterhoeven
2007-07-13 12:27 ` PS3 Storage Driver O_DIRECT issue Olaf Hering
2007-07-13 12:27 ` Olaf Hering
2007-07-13 12:27 ` Olaf Hering
2007-07-13 13:34 ` Geert Uytterhoeven
2007-07-13 13:34 ` Geert Uytterhoeven
2007-07-13 13:34 ` Geert Uytterhoeven
2007-07-17 16:40 ` Geoff Levand
2007-07-17 16:40 ` Geoff Levand
2007-07-17 16:40 ` Geoff Levand
2007-07-18 16:12 ` Geert Uytterhoeven
2007-07-18 16:12 ` Geert Uytterhoeven
2007-07-18 16:12 ` Geert Uytterhoeven
2007-07-18 17:57 ` Jens Axboe
2007-07-18 17:57 ` Jens Axboe
2007-07-18 17:57 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2007-06-21 14:14 [patch 0/6] PS3 Storage Drivers for 2.6.23, take 3 Geert Uytterhoeven
2007-06-21 14:14 ` [patch 5/6] ps3: BD/DVD/CD-ROM Storage Driver Geert Uytterhoeven
2007-06-21 14:14 ` Geert Uytterhoeven
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