From: Zach Pfeffer <zpfeffer@codeaurora.org>
To: Hari Kanigeri <hari.kanigeri@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>,
Daniel Walker <dwalker@codeaurora.org>,
Randy Dunlap <randy.dunlap@oracle.com>,
mel@csn.ul.ie, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-arm-msm@vger.kernel.org, linux-omap@vger.kernel.org,
linux-arm-kernel@jasper.es
Subject: Re: [RFC 3/3] mm: iommu: The Virtual Contiguous Memory Manager
Date: Fri, 02 Jul 2010 00:29:57 -0700 [thread overview]
Message-ID: <4C2D9575.9030002@codeaurora.org> (raw)
In-Reply-To: <AANLkTilQnopqrS-KrR3btOIkH68fIEdipWFF6fkO6fNA@mail.gmail.com>
Hari Kanigeri wrote:
>> The VCMM takes the long view. Its designed for a future in which the
>> number of IOMMUs will go up and the ways in which these IOMMUs are
>> composed will vary from system to system, and may vary at
>> runtime. Already, there are ~20 different IOMMU map implementations in
>> the kernel. Had the Linux kernel had the VCMM, many of those
>> implementations could have leveraged the mapping and topology management
>> of a VCMM, while focusing on a few key hardware specific functions (map
>> this physical address, program the page table base register).
>>
>
> -- Sounds good.
> Did you think of a way to handle the cases where one of the Device
> that is using the mapped address crashed ?
> How is the physical address unbacked in this case ?
Actually the API takes care of that by design. Since the physical
space is managed apart from the mapper the mapper can crash and not
affect the physical memory allocation.
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
WARNING: multiple messages have this Message-ID (diff)
From: Zach Pfeffer <zpfeffer@codeaurora.org>
To: Hari Kanigeri <hari.kanigeri@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>,
Daniel Walker <dwalker@codeaurora.org>,
Randy Dunlap <randy.dunlap@oracle.com>,
mel@csn.ul.ie, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-arm-msm@vger.kernel.org, linux-omap@vger.kernel.org,
linux-arm-kernel@jasper.es
Subject: Re: [RFC 3/3] mm: iommu: The Virtual Contiguous Memory Manager
Date: Fri, 02 Jul 2010 00:29:57 -0700 [thread overview]
Message-ID: <4C2D9575.9030002@codeaurora.org> (raw)
In-Reply-To: <AANLkTilQnopqrS-KrR3btOIkH68fIEdipWFF6fkO6fNA@mail.gmail.com>
Hari Kanigeri wrote:
>> The VCMM takes the long view. Its designed for a future in which the
>> number of IOMMUs will go up and the ways in which these IOMMUs are
>> composed will vary from system to system, and may vary at
>> runtime. Already, there are ~20 different IOMMU map implementations in
>> the kernel. Had the Linux kernel had the VCMM, many of those
>> implementations could have leveraged the mapping and topology management
>> of a VCMM, while focusing on a few key hardware specific functions (map
>> this physical address, program the page table base register).
>>
>
> -- Sounds good.
> Did you think of a way to handle the cases where one of the Device
> that is using the mapped address crashed ?
> How is the physical address unbacked in this case ?
Actually the API takes care of that by design. Since the physical
space is managed apart from the mapper the mapper can crash and not
affect the physical memory allocation.
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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next prev parent reply other threads:[~2010-07-02 7:29 UTC|newest]
Thread overview: 142+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-30 5:55 [RFC 1/3] mm: iommu: An API to unify IOMMU, CPU and device memory management Zach Pfeffer
2010-06-30 5:55 ` Zach Pfeffer
2010-06-30 5:55 ` Zach Pfeffer
2010-06-30 5:55 ` [RFC 2/3] mm: iommu: A physical allocator for the VCMM Zach Pfeffer
2010-06-30 5:55 ` Zach Pfeffer
2010-06-30 5:55 ` Zach Pfeffer
2010-06-30 5:55 ` [RFC 3/3] mm: iommu: The Virtual Contiguous Memory Manager Zach Pfeffer
2010-06-30 5:55 ` Zach Pfeffer
2010-06-30 5:55 ` Zach Pfeffer
2010-07-01 17:17 ` Randy Dunlap
2010-07-01 17:17 ` Randy Dunlap
2010-07-01 17:17 ` Randy Dunlap
2010-07-01 18:02 ` Andi Kleen
2010-07-01 18:02 ` Andi Kleen
2010-07-01 18:02 ` Andi Kleen
2010-07-01 19:28 ` Daniel Walker
2010-07-01 19:28 ` Daniel Walker
2010-07-01 19:28 ` Daniel Walker
2010-07-01 19:38 ` Andi Kleen
2010-07-01 19:38 ` Andi Kleen
2010-07-01 19:38 ` Andi Kleen
2010-07-01 19:42 ` Daniel Walker
2010-07-01 19:42 ` Daniel Walker
2010-07-01 19:42 ` Daniel Walker
2010-07-01 22:15 ` Hari Kanigeri
2010-07-01 22:15 ` Hari Kanigeri
2010-07-01 22:15 ` Hari Kanigeri
2010-07-02 7:09 ` Zach Pfeffer
2010-07-02 7:09 ` Zach Pfeffer
2010-07-02 7:09 ` Zach Pfeffer
2010-07-10 14:36 ` Joerg Roedel
2010-07-10 14:36 ` Joerg Roedel
2010-07-10 14:36 ` Joerg Roedel
2010-07-13 5:21 ` Zach Pfeffer
2010-07-13 5:21 ` Zach Pfeffer
2010-07-13 5:21 ` Zach Pfeffer
2010-07-14 19:34 ` Joerg Roedel
2010-07-14 19:34 ` Joerg Roedel
2010-07-14 19:34 ` Joerg Roedel
2010-07-15 1:18 ` Zach Pfeffer
2010-07-15 1:18 ` Zach Pfeffer
2010-07-15 1:18 ` Zach Pfeffer
2010-07-01 22:00 ` Zach Pfeffer
2010-07-01 22:00 ` Zach Pfeffer
2010-07-01 22:00 ` Zach Pfeffer
2010-07-01 22:05 ` Daniel Walker
2010-07-01 22:05 ` Daniel Walker
2010-07-01 22:05 ` Daniel Walker
2010-07-02 7:33 ` Zach Pfeffer
2010-07-02 7:33 ` Zach Pfeffer
2010-07-02 7:33 ` Zach Pfeffer
2010-07-10 14:56 ` Joerg Roedel
2010-07-10 14:56 ` Joerg Roedel
2010-07-10 14:56 ` Joerg Roedel
2010-07-13 5:46 ` Zach Pfeffer
2010-07-13 5:46 ` Zach Pfeffer
2010-07-13 5:46 ` Zach Pfeffer
2010-07-13 5:59 ` FUJITA Tomonori
2010-07-13 5:59 ` FUJITA Tomonori
2010-07-13 5:59 ` FUJITA Tomonori
2010-07-13 8:20 ` Alan Cox
2010-07-13 8:20 ` Alan Cox
2010-07-13 8:20 ` Alan Cox
2010-07-13 8:30 ` FUJITA Tomonori
2010-07-13 8:30 ` FUJITA Tomonori
2010-07-13 8:30 ` FUJITA Tomonori
2010-07-13 8:42 ` Alan Cox
2010-07-13 8:42 ` Alan Cox
2010-07-13 8:42 ` Alan Cox
2010-07-13 8:45 ` FUJITA Tomonori
2010-07-13 8:45 ` FUJITA Tomonori
2010-07-13 8:45 ` FUJITA Tomonori
2010-07-13 9:02 ` Russell King - ARM Linux
2010-07-13 9:02 ` Russell King - ARM Linux
2010-07-13 9:02 ` Russell King - ARM Linux
2010-07-14 1:59 ` FUJITA Tomonori
2010-07-14 1:59 ` FUJITA Tomonori
2010-07-14 1:59 ` FUJITA Tomonori
2010-07-22 3:50 ` Zach Pfeffer
2010-07-22 3:50 ` Zach Pfeffer
2010-07-22 3:50 ` Zach Pfeffer
2010-07-22 4:47 ` FUJITA Tomonori
2010-07-22 4:47 ` FUJITA Tomonori
2010-07-22 4:47 ` FUJITA Tomonori
2010-07-22 16:33 ` Zach Pfeffer
2010-07-22 16:33 ` Zach Pfeffer
2010-07-22 16:33 ` Zach Pfeffer
2010-07-22 7:51 ` Russell King - ARM Linux
2010-07-22 7:51 ` Russell King - ARM Linux
2010-07-22 7:51 ` Russell King - ARM Linux
2010-07-22 16:13 ` Zach Pfeffer
2010-07-22 16:13 ` Zach Pfeffer
2010-07-22 16:13 ` Zach Pfeffer
2010-07-13 12:06 ` Zach Pfeffer
2010-07-13 12:06 ` Zach Pfeffer
2010-07-13 12:06 ` Zach Pfeffer
2010-07-01 22:51 ` Hari Kanigeri
2010-07-01 22:51 ` Hari Kanigeri
2010-07-01 22:51 ` Hari Kanigeri
2010-07-02 7:29 ` Zach Pfeffer [this message]
2010-07-02 7:29 ` Zach Pfeffer
2010-07-01 23:00 ` Andi Kleen
2010-07-01 23:00 ` Andi Kleen
2010-07-01 23:00 ` Andi Kleen
2010-07-02 6:17 ` Zach Pfeffer
2010-07-02 6:17 ` Zach Pfeffer
2010-07-02 6:17 ` Zach Pfeffer
2010-07-02 8:22 ` Andi Kleen
2010-07-02 8:22 ` Andi Kleen
2010-07-02 8:22 ` Andi Kleen
2010-07-02 18:42 ` Zach Pfeffer
2010-07-02 18:42 ` Zach Pfeffer
2010-07-02 18:42 ` Zach Pfeffer
2010-07-10 15:11 ` Joerg Roedel
2010-07-10 15:11 ` Joerg Roedel
2010-07-10 15:11 ` Joerg Roedel
2010-07-13 5:52 ` Zach Pfeffer
2010-07-13 5:52 ` Zach Pfeffer
2010-07-13 5:52 ` Zach Pfeffer
2010-07-03 6:36 ` Zach Pfeffer
2010-07-03 6:36 ` Zach Pfeffer
2010-07-10 14:54 ` Joerg Roedel
2010-07-10 14:54 ` Joerg Roedel
2010-07-10 14:54 ` Joerg Roedel
2010-07-13 5:27 ` Zach Pfeffer
2010-07-13 5:27 ` Zach Pfeffer
2010-07-13 5:27 ` Zach Pfeffer
2010-07-01 20:59 ` Paul Walmsley
2010-07-01 20:59 ` Paul Walmsley
2010-07-01 20:59 ` Paul Walmsley
2010-07-01 21:48 ` Randy Dunlap
2010-07-01 21:48 ` Randy Dunlap
2010-07-01 21:48 ` Randy Dunlap
2010-06-30 23:40 ` [RFC 1/3] mm: iommu: An API to unify IOMMU, CPU and device memory management Randy Dunlap
2010-06-30 23:40 ` Randy Dunlap
2010-06-30 23:40 ` Randy Dunlap
2010-07-01 7:16 ` Zach Pfeffer
2010-07-01 7:16 ` Zach Pfeffer
2010-07-01 7:16 ` Zach Pfeffer
2010-07-02 7:00 ` Paul Mundt
2010-07-02 7:00 ` Paul Mundt
2010-07-02 7:00 ` Paul Mundt
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