From: ebiederm@xmission.com (Eric W. Biederman)
To: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Matthew Wilcox <matthew@wil.cx>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"grundler@parisc-linux.org" <grundler@parisc-linux.org>,
"mingo@elte.hu" <mingo@elte.hu>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"jgarzik@pobox.com" <jgarzik@pobox.com>,
"linux-ide@vger.kernel.org" <linux-ide@vger.kernel.org>,
"benh@kernel.crashing.org" <benh@kernel.crashing.org>,
"jbarnes@virtuousgeek.org" <jbarnes@virtuousgeek.org>,
"rdunlap@xenotime.net" <rdunlap@xenotime.net>,
"mtk.manpages@gmail.com" <mtk.manpages@gmail.com>
Subject: Re: Multiple MSI, take 3
Date: Fri, 11 Jul 2008 16:59:42 -0700 [thread overview]
Message-ID: <m163rc6kgh.fsf@frodo.ebiederm.org> (raw)
In-Reply-To: <20080711231543.GY1678@linux-os.sc.intel.com> (Suresh Siddha's message of "Fri, 11 Jul 2008 16:15:43 -0700")
Suresh Siddha <suresh.b.siddha@intel.com> writes:
> And why do we need to mask/unmask the device in the interrupt-remapping case?
Why do we ever? It is part of the linux irq API and people wind up using
it in all kinds of strange ways.
One of the more surprising uses I have see is for the real time kernel
people mask the irq, wake up a kernel thread (to handle the irq), then
ack the irq and get out of the interrupt handler. It looked like
people working on UIO were starting to implement something similar.
>> Speaking of. How many interrupt targets does the dmar iommu have
>> for interrupts? 16K?
>
> There can be multiple interrupt-remapping units in the platform and
> each of table in the remapping unit has max 64K entries.
Thanks. That should last us for a little while. :)
Eric
next prev parent reply other threads:[~2008-07-11 23:59 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-11 0:57 Multiple MSI, take 3 Matthew Wilcox
2008-07-11 0:59 ` [PATCH] PCI MSI: Replace 'type' with 'is_msix' Matthew Wilcox
2008-07-11 0:59 ` [PATCH] PCI: Add support for multiple MSI Matthew Wilcox
2008-07-11 8:28 ` Hidetoshi Seto
2008-07-11 9:45 ` Matthew Wilcox
2008-07-12 3:45 ` Benjamin Herrenschmidt
2008-07-11 1:00 ` [PATCH] Rewrite MSI-HOWTO Matthew Wilcox
2008-09-26 6:42 ` Grant Grundler
2008-07-11 1:00 ` [PATCH] AHCI: Request multiple MSIs Matthew Wilcox
2008-07-11 1:00 ` [PATCH] x86-64: Support for " Matthew Wilcox
2008-07-11 4:50 ` Kenji Kaneshige
2008-07-11 8:50 ` Matthew Wilcox
2008-07-14 1:08 ` Kenji Kaneshige
2008-07-11 10:06 ` Multiple MSI, take 3 Eric W. Biederman
2008-07-11 10:23 ` Matthew Wilcox
2008-07-11 10:32 ` David Miller
2008-07-11 10:41 ` Matthew Wilcox
2008-07-11 11:05 ` Eric W. Biederman
2008-07-11 11:34 ` Eric W. Biederman
2008-07-11 12:17 ` Matthew Wilcox
2008-07-11 15:10 ` Matthew Wilcox
2008-07-11 21:59 ` Suresh Siddha
2008-07-11 22:59 ` Eric W. Biederman
2008-07-11 23:15 ` Suresh Siddha
2008-07-11 23:59 ` Eric W. Biederman [this message]
2008-07-12 3:52 ` Benjamin Herrenschmidt
2008-07-12 4:41 ` Eric W. Biederman
2008-07-12 7:36 ` Benjamin Herrenschmidt
2008-07-13 22:30 ` Eric W. Biederman
2008-07-13 22:44 ` Benjamin Herrenschmidt
2008-07-13 23:29 ` Eric W. Biederman
2008-07-14 0:17 ` Benjamin Herrenschmidt
2008-07-14 0:44 ` David Miller
2008-07-14 2:03 ` Eric W. Biederman
2008-07-14 3:19 ` David Miller
2008-09-26 5:30 ` Jike Song
2008-09-27 19:04 ` Matthew Wilcox
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