From: swarren@wwwdotorg•org (Stephen Warren)
To: linux-arm-kernel@lists•infradead.org
Subject: [RFC 0/5] ARM: dma-mapping: New dma_map_ops to control IOVA more precisely
Date: Wed, 19 Sep 2012 20:21:40 -0600 [thread overview]
Message-ID: <505A7DB4.4090902@wwwdotorg.org> (raw)
In-Reply-To: <401E54CE964CD94BAE1EB4A729C7087E379FDC1EEB@HQMAIL04.nvidia.com>
On 09/19/2012 07:44 PM, Krishna Reddy wrote:
>> When a device driver would only use the IOMMU-API and needs small DMA-
>> able areas it has to re-implement something like the DMA-API (basically an
>> address allocator) for that. So I don't see a reason why both can't be used in a
>> device driver.
>
> On Tegra, the following use cases need specific IOVA mapping.
> 1. Few MMIO blocks need IOVA=PA mapping setup.
In that case, why would we enable the IOMMU for that one device; IOMMU
disabled means VA==PA, right? Perhaps isolation of the device so it can
only access certain PA ranges for security?
next prev parent reply other threads:[~2012-09-20 2:21 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-29 6:55 [RFC 0/5] ARM: dma-mapping: New dma_map_ops to control IOVA more precisely Hiroshi Doyu
2012-08-29 6:55 ` [RFC 1/5] ARM: dma-mapping: New dma_map_ops->iova_get_free_{total, max} functions Hiroshi Doyu
2012-08-29 6:55 ` [RFC 2/5] ARM: dma-mapping: New dma_map_ops->iova_{alloc, free}() functions Hiroshi Doyu
2012-08-29 6:55 ` [RFC 3/5] ARM: dma-mapping: New dma_map_ops->iova_alloc*_at* function Hiroshi Doyu
2012-08-29 6:55 ` [RFC 4/5] ARM: dma-mapping: New dma_map_ops->map_page*_at* function Hiroshi Doyu
2012-08-29 6:55 ` [RFC 5/5] ARM: dma-mapping: Introduce dma_map_linear_attrs() for IOVA linear map Hiroshi Doyu
2012-09-18 12:49 ` [RFC 0/5] ARM: dma-mapping: New dma_map_ops to control IOVA more precisely Joerg Roedel
2012-09-19 6:58 ` Hiroshi Doyu
2012-09-19 7:59 ` Arnd Bergmann
2012-09-19 11:41 ` Hiroshi Doyu
2012-09-19 12:50 ` Joerg Roedel
2012-09-20 1:44 ` Krishna Reddy
2012-09-20 2:21 ` Stephen Warren [this message]
2012-09-20 6:40 ` Krishna Reddy
2012-09-20 15:27 ` Stephen Warren
2012-09-21 18:16 ` Krishna Reddy
2012-09-24 9:04 ` How to specify IOMMU'able devices in DT (was: [RFC 0/5] ARM: dma-mapping: New dma_map_ops to control IOVA more precisely) Hiroshi Doyu
2012-09-24 9:28 ` James Bottomley
2012-09-24 9:44 ` Hiroshi Doyu
2012-09-24 11:14 ` Marek Szyprowski
2012-09-24 11:50 ` How to specify IOMMU'able devices in DT Hiroshi Doyu
2012-11-28 13:48 ` [PATCH 1/1] ARM: tegra: bus_notifier registers IOMMU devices(was: How to specify IOMMU'able devices in DT) Hiroshi Doyu
2012-11-28 18:07 ` Stephen Warren
2012-11-29 6:45 ` Hiroshi Doyu
2012-11-29 10:17 ` Thierry Reding
2012-11-30 4:59 ` Mark Zhang
2012-11-30 8:06 ` [PATCH 1/1] ARM: tegra: bus_notifier registers IOMMU devices Hiroshi Doyu
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