From: "Keshavamurthy, Anil S" <anil.s.keshavamurthy@intel.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: "Keshavamurthy, Anil S" <anil.s.keshavamurthy@intel.com>,
Andi Kleen <ak@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, gregkh@suse.de, muli@il.ibm.com,
asit.k.mallick@intel.com, suresh.b.siddha@intel.com,
arjan@linux.intel.com, ashok.raj@intel.com, shaohua.li@intel.com,
davem@davemloft.net
Subject: Re: [Intel-IOMMU 02/10] Library routine for pre-allocat pool handling
Date: Mon, 11 Jun 2007 14:40:04 -0700 [thread overview]
Message-ID: <20070611214004.GA19162@linux-os.sc.intel.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0706111428410.20454@schroedinger.engr.sgi.com>
On Mon, Jun 11, 2007 at 02:29:56PM -0700, Christoph Lameter wrote:
> On Mon, 11 Jun 2007, Keshavamurthy, Anil S wrote:
>
> > Hence, can I assume that the conclusion of this
> > discussion is to use kmem_cache_alloc() functions
> > to allocate memory in dma_map_{single|sg} API's?
>
>
> Use the page allocator for page size allocations. If you need to have
> specially aligned memory in less than page sized chunks then use
> kmem_cache_alloc with a specially configured slab.
Okay, will do this change and get back to the list.
> >
> > Again, if dma_map_{single|sg} API's fails due to
> > failure to allocate memory, the only thing that can
> > be done is to panic as this is what few of the other
> > IOMMU implementation is doing today.
>
> Why does it have to be so severe? The I/O operation fails right?
Not sure. Also most of the callers today don;t check for failures.
-Anil
next prev parent reply other threads:[~2007-06-11 21:44 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-06 18:56 [Intel-IOMMU 00/10] Intel IOMMU Support anil.s.keshavamurthy
2007-06-06 18:56 ` [Intel-IOMMU 01/10] DMAR detection and parsing logic anil.s.keshavamurthy
2007-06-06 18:57 ` [Intel-IOMMU 02/10] Library routine for pre-allocat pool handling anil.s.keshavamurthy
2007-06-07 23:27 ` Andrew Morton
2007-06-08 18:21 ` Keshavamurthy, Anil S
2007-06-08 19:01 ` Andrew Morton
2007-06-08 20:12 ` Keshavamurthy, Anil S
2007-06-08 20:40 ` Siddha, Suresh B
2007-06-08 20:44 ` Andrew Morton
2007-06-08 22:33 ` Christoph Lameter
2007-06-08 22:49 ` Keshavamurthy, Anil S
2007-06-08 20:43 ` Andreas Kleen
2007-06-08 20:55 ` Andrew Morton
2007-06-08 22:31 ` Andi Kleen
2007-06-08 21:20 ` Keshavamurthy, Anil S
2007-06-08 21:42 ` Andrew Morton
2007-06-08 22:17 ` Arjan van de Ven
2007-06-08 22:18 ` Siddha, Suresh B
2007-06-08 22:38 ` Christoph Lameter
2007-06-08 22:36 ` Christoph Lameter
2007-06-08 22:56 ` Andi Kleen
2007-06-08 22:59 ` Christoph Lameter
2007-06-09 9:47 ` Andi Kleen
2007-06-11 20:44 ` Keshavamurthy, Anil S
2007-06-11 21:14 ` Andrew Morton
2007-06-11 9:46 ` Ashok Raj
2007-06-11 22:16 ` Andi Kleen
2007-06-11 23:28 ` Christoph Lameter
2007-06-11 23:52 ` Keshavamurthy, Anil S
2007-06-12 0:30 ` Andrew Morton
2007-06-12 1:10 ` Arjan van de Ven
2007-06-12 1:30 ` Christoph Lameter
2007-06-12 1:35 ` Andrew Morton
2007-06-12 1:55 ` Arjan van de Ven
2007-06-12 2:08 ` Siddha, Suresh B
2007-06-13 18:40 ` Matt Mackall
2007-06-13 19:04 ` Andi Kleen
2007-06-12 0:38 ` Christoph Lameter
2007-06-11 21:29 ` Christoph Lameter
2007-06-11 21:40 ` Keshavamurthy, Anil S [this message]
2007-06-11 22:25 ` Andi Kleen
2007-06-11 11:29 ` Ashok Raj
2007-06-11 23:15 ` Keshavamurthy, Anil S
2007-06-08 22:32 ` Christoph Lameter
2007-06-08 22:45 ` Keshavamurthy, Anil S
2007-06-08 22:55 ` Christoph Lameter
2007-06-10 16:38 ` Arjan van de Ven
2007-06-11 16:10 ` Christoph Lameter
2007-06-06 18:57 ` [Intel-IOMMU 03/10] PCI generic helper function anil.s.keshavamurthy
2007-06-06 18:57 ` [Intel-IOMMU 04/10] clflush_cache_range now takes size param anil.s.keshavamurthy
2007-06-06 18:57 ` [Intel-IOMMU 05/10] IOVA allocation and management routines anil.s.keshavamurthy
2007-06-07 23:34 ` Andrew Morton
2007-06-08 18:25 ` Keshavamurthy, Anil S
2007-06-06 18:57 ` [Intel-IOMMU 06/10] Intel IOMMU driver anil.s.keshavamurthy
2007-06-07 23:57 ` Andrew Morton
2007-06-08 22:30 ` Christoph Lameter
2007-06-13 20:20 ` Keshavamurthy, Anil S
2007-06-06 18:57 ` [Intel-IOMMU 07/10] Intel iommu cmdline option - forcedac anil.s.keshavamurthy
2007-06-07 23:58 ` Andrew Morton
2007-06-06 18:57 ` [Intel-IOMMU 08/10] DMAR fault handling support anil.s.keshavamurthy
2007-06-06 18:57 ` [Intel-IOMMU 09/10] Iommu Gfx workaround anil.s.keshavamurthy
2007-06-08 0:01 ` Andrew Morton
2007-06-06 18:57 ` [Intel-IOMMU 10/10] Iommu floppy workaround anil.s.keshavamurthy
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