From: Alan Cox <alan@redhat.com>
To: Vladimir Kondratiev <vladimir.kondratiev@intel.com>
Cc: arjanv@redhat.com, Gabriel Paubert <paubert@iram.es>,
linux-kernel@vger.kernel.org, Jeff Garzik <jgarzik@pobox.com>,
Alan Cox <alan@redhat.com>,
Marcelo Tosatti <marcelo@conectiva.com.br>,
Martin Mares <mj@ucw.cz>,
zaitcev@redhat.com, hch@infradead.org
Subject: Re: PCI Express support for 2.4 kernel
Date: Mon, 15 Dec 2003 14:23:37 -0500 [thread overview]
Message-ID: <20031215192337.GA18811@devserv.devel.redhat.com> (raw)
In-Reply-To: <3FDDBDFE.5020707@intel.com>
> It looks confusing. On my test system (don't ask details, I am not
> alowed to share this info), I see
> video controller with 256Mb BAR. Does it mean this controller will not
> work as well?
The 256Mb BAR turns up in a variety of graphic cards, and 512Mb in a few.
The kernel maps just enough memory for the frame buffer + cache. There isn't
enough space to map it all. User space apps may well have the 512Mb mapped
into their address space, but that isnt the kernel one
> There is alternative solution, for each transaction to ioremap/unmap
> corresponded page.
> I don't like it, it involves huge overhead.
ioremap means you can't use pci_exp_* from an interrupt so kmap is probably
needed. It is overhead but the design of the 386 left us with that problem on
x86 platforms and it isnt going to go away. On ia64/x86_64 etc its a non issue
next prev parent reply other threads:[~2003-12-15 19:24 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-14 20:00 PCI Express support for 2.4 kernel Vladimir Kondratiev
2003-12-14 20:46 ` Jeff Garzik
2003-12-15 10:01 ` Vladimir Kondratiev
2003-12-15 10:31 ` Gabriel Paubert
2003-12-15 12:44 ` Vladimir Kondratiev
2003-12-15 13:15 ` Arjan van de Ven
2003-12-15 13:58 ` Vladimir Kondratiev
2003-12-15 14:31 ` Arjan van de Ven
2003-12-15 14:44 ` Brian Gerst
2003-12-15 18:40 ` Greg KH
2003-12-15 19:23 ` Alan Cox [this message]
2003-12-15 20:00 ` Linus Torvalds
2003-12-16 10:20 ` Vladimir Kondratiev
2003-12-16 16:47 ` Linus Torvalds
2003-12-17 6:30 ` Vladimir Kondratiev
2003-12-17 6:46 ` Linus Torvalds
2003-12-17 6:55 ` Jeff Garzik
2003-12-17 7:24 ` Vladimir Kondratiev
2003-12-17 16:17 ` Linus Torvalds
2003-12-17 8:22 ` Arjan van de Ven
2003-12-17 10:35 ` Martin Mares
2003-12-17 23:06 ` Alan Cox
2003-12-17 10:08 ` Geert Uytterhoeven
2003-12-17 15:54 ` Linus Torvalds
2003-12-17 16:14 ` Geert Uytterhoeven
2003-12-17 17:44 ` Dan Hopper
2003-12-17 18:14 ` Vladimir Kondratiev
2003-12-17 21:44 ` Martin Mares
2003-12-16 17:10 ` Jeff Garzik
2003-12-16 17:48 ` Arjan van de Ven
2003-12-16 17:55 ` Jeff Garzik
2003-12-16 22:39 ` Vladimir Kondratiev
2003-12-17 0:12 ` Richard B. Johnson
2003-12-16 21:59 ` Vladimir Kondratiev
2003-12-16 17:45 ` Greg KH
2003-12-16 22:14 ` Vladimir Kondratiev
2003-12-17 10:05 ` Geert Uytterhoeven
2003-12-15 15:57 ` Vladimir Kondratiev
2003-12-15 10:42 ` Martin Mares
2003-12-15 10:07 ` Greg KH
2003-12-15 11:20 ` Vladimir Kondratiev
[not found] <12InT-wQ-5@gated-at.bofh.it>
[not found] ` <135Nw-5gv-3@gated-at.bofh.it>
[not found] ` <137wc-q1-23@gated-at.bofh.it>
2003-12-15 21:56 ` Andi Kleen
2003-12-15 22:48 ` Vladimir Kondratiev
2003-12-15 23:06 ` Andi Kleen
2003-12-15 23:14 ` Greg KH
-- strict thread matches above, loose matches on Subject: below --
2003-12-15 20:08 Nakajima, Jun
[not found] <Pine.LNX.4.44.0312150917170.32061-100000@coffee.psychology.mcmaster.ca>
2003-12-15 15:52 ` Vladimir Kondratiev
2003-12-15 16:08 ` Kevin P. Fleming
2003-12-15 16:38 ` Vladimir Kondratiev
2003-12-15 16:55 ` Richard B. Johnson
2003-12-15 17:08 ` Tomas Szepe
2003-12-15 18:03 ` Richard B. Johnson
2003-12-15 18:15 ` Tomas Szepe
2003-12-15 18:35 ` Richard B. Johnson
2003-12-15 18:43 ` Keith Owens
2003-12-15 18:45 ` Tomas Szepe
2003-12-15 17:24 ` Vladimir Kondratiev
2003-12-15 17:22 ` Randy.Dunlap
2003-12-15 18:16 ` Greg KH
2003-12-15 18:20 ` Richard B. Johnson
2003-12-15 17:09 ` Keith Owens
2003-12-15 17:38 ` Tomas Szepe
2003-12-15 18:16 ` Keith Owens
2003-12-15 18:23 ` Tomas Szepe
[not found] <12KJ6-4F2-13@gated-at.bofh.it>
[not found] ` <12Lvu-5X5-5@gated-at.bofh.it>
[not found] ` <12XQ2-7Vs-9@gated-at.bofh.it>
2003-12-15 10:17 ` Andi Kleen
[not found] ` <12YsA-nt-1@gated-at.bofh.it>
[not found] ` <130kQ-3A0-13@gated-at.bofh.it>
[not found] ` <130Xy-4Ia-3@gated-at.bofh.it>
[not found] ` <131Ac-5Qy-3@gated-at.bofh.it>
[not found] ` <137cD-8eg-9@gated-at.bofh.it>
[not found] ` <13kD2-1kF-11@gated-at.bofh.it>
2003-12-16 17:44 ` Andi Kleen
[not found] ` <13r1S-3FB-11@gated-at.bofh.it>
[not found] ` <13vyg-43O-7@gated-at.bofh.it>
2003-12-16 22:18 ` Andi Kleen
[not found] ` <13qIi-31G-1@gated-at.bofh.it>
[not found] ` <13DvZ-2RY-9@gated-at.bofh.it>
[not found] ` <13DFw-3a8-9@gated-at.bofh.it>
[not found] ` <13DPq-3s4-7@gated-at.bofh.it>
[not found] ` <13Fem-6iy-7@gated-at.bofh.it>
[not found] ` <13SY1-35z-19@gated-at.bofh.it>
2003-12-17 23:22 ` Andi Kleen
2003-12-17 23:38 ` Alan Cox
[not found] ` <12XQc-7Vs-29@gated-at.bofh.it>
[not found] ` <12Z5u-1tG-11@gated-at.bofh.it>
2003-12-15 14:58 ` Andi Kleen
2003-12-15 15:40 ` Vladimir Kondratiev
[not found] <3FDCA569.5070006@pobox.com>
2003-12-15 4:47 ` Pete Zaitcev
2003-12-14 17:28 Vladimir Kondratiev
2003-12-15 7:48 ` Christoph Hellwig
2003-12-15 18:26 ` Linus Torvalds
2003-12-15 20:03 ` Jeff Garzik
2003-12-15 22:00 ` Linus Torvalds
2003-12-16 4:53 ` Jeff Garzik
2003-12-15 20:21 ` Vladimir Kondratiev
2003-12-15 20:36 ` Jeff Garzik
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