From: Arnd Bergmann <arnd@arndb.de>
To: Eli Billauer <eli.billauer@gmail.com>
Cc: Greg KH <gregkh@linuxfoundation.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] New driver: Xillybus generic interface for FPGA (programmable logic)
Date: Fri, 30 Nov 2012 17:32:27 +0000 [thread overview]
Message-ID: <201211301732.27921.arnd@arndb.de> (raw)
In-Reply-To: <50B8E5A0.1020406@gmail.com>
On Friday 30 November 2012, Eli Billauer wrote:
> The problem is if the page size smaller than 4kB. The buffers
> allocated by the driver must not cross a 4kB boundary, and it's assumed
> that anything returned by __get_free_pages() is 4 kB-aligned. Otherwise
> the FPGA will generate illegal PCIe packets by crossing that boundary.
>
> If the page boundary is bigger than 4k, the driver handles that well.
>
That should be fine then. We don't really support running Linux on
systems with a page size smaller than 4KB anyway, and I think the
only ones that ever hard smaller hardware page sizes (iirc m68k
or vax) were emulating 4KB pages in software.
Arnd
next prev parent reply other threads:[~2012-11-30 17:32 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-28 15:41 [PATCH 1/2] pci_ids: Added FPGA-related entries Eli Billauer
2012-11-28 15:41 ` [PATCH 2/2] New driver: Xillybus generic interface for FPGA (programmable logic) Eli Billauer
2012-11-28 16:57 ` Greg KH
2012-11-30 14:50 ` Eli Billauer
2012-11-30 16:32 ` Greg KH
2012-11-30 16:58 ` Eli Billauer
2012-11-30 17:32 ` Arnd Bergmann [this message]
2012-12-02 17:26 ` Eli Billauer
2012-12-04 3:41 ` Greg KH
2012-12-04 10:13 ` Eli Billauer
2012-12-04 20:43 ` Arnd Bergmann
2012-12-04 21:42 ` Eli Billauer
2012-12-04 23:05 ` Arnd Bergmann
2012-12-05 0:03 ` Eli Billauer
2012-12-05 15:48 ` Greg KH
2012-11-30 17:28 ` Arnd Bergmann
2012-11-30 17:36 ` Greg KH
2012-12-01 3:19 ` Philip Balister
2012-12-01 16:56 ` Greg KH
2012-12-01 16:58 ` Greg KH
2012-12-01 19:30 ` Philip Balister
2012-12-01 20:33 ` Josh Cartwright
2012-12-01 20:48 ` Arnd Bergmann
2012-12-02 12:38 ` Eli Billauer
2012-12-03 20:24 ` John Linn
2012-12-04 19:49 ` Philip Balister
2012-12-04 20:54 ` Arnd Bergmann
2012-12-05 12:34 ` Pavel Machek
2012-11-28 16:50 ` [PATCH 1/2] pci_ids: Added FPGA-related entries Greg KH
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