From: Murali Karicheri <m-karicheri2@ti.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: <bhelgaas@google.com>, <linux-arm-kernel@lists.infradead.org>,
<joro@8bytes.org>, <grant.likely@linaro.org>,
<robh+dt@kernel.org>, <iommu@lists.linux-foundation.org>,
<linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-pci@vger.kernel.org>, <will.deacon@arm.com>,
<linux@arm.linux.org.uk>
Subject: Re: [PATCH v3 0/4] PCI: get DMA configuration from parent device
Date: Thu, 8 Jan 2015 17:46:31 -0500 [thread overview]
Message-ID: <54AF08C7.2010100@ti.com> (raw)
In-Reply-To: <2785994.gTZ9chGdKf@wuerfel>
On 01/08/2015 05:27 PM, Arnd Bergmann wrote:
> On Thursday 08 January 2015 09:56:39 Arnd Bergmann wrote:
>> There is another interesting case, which is a USB host controller or
>> something similar behind a PCI bus. These are quite common and also
>> need to be handled in some form. Let's do just PCI first for now, but
>> be aware that this will come next. Should we assume that the ID that
>> is required for a device is either known from the device node, or
>> that it comes from a PCI device? That means for the USB case, we will
>> likely need to have some custom logic. There seems to be an implicit
>> assumption all over the kernel that all devices have the same IOMMU
>> instance, but we can't really rely on that here.
>>
>
> Update: I've checked the USB implementation and we are lucky because
> these interactions are all done by the USB host controller, and a
> USB device is not itself DMA capable. We don't have to do anything
> for USB.
Ok Thanks.
Murali
>
> Arnd
> --
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--
Murali Karicheri
Linux Kernel, Texas Instruments
next prev parent reply other threads:[~2015-01-08 22:47 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-07 18:49 [PATCH v3 0/4] PCI: get DMA configuration from parent device Murali Karicheri
2015-01-07 18:49 ` [PATCH v3 1/4] of: iommu: add ptr to OF node arg to of_iommu_configure() Murali Karicheri
2015-01-07 23:30 ` Rob Herring
2015-01-08 18:29 ` Murali Karicheri
2015-01-07 18:49 ` [PATCH v3 2/4] of: move of_dma_configure() to device,c to help re-use Murali Karicheri
2015-01-07 23:37 ` Rob Herring
2015-01-08 8:40 ` Arnd Bergmann
2015-01-08 19:26 ` Murali Karicheri
2015-01-08 22:24 ` Arnd Bergmann
2015-01-08 23:44 ` Murali Karicheri
2015-01-09 0:05 ` Arnd Bergmann
2015-01-09 15:34 ` Rob Herring
2015-01-23 18:19 ` Murali Karicheri
2015-01-23 18:35 ` Rob Herring
2015-01-07 18:49 ` [PATCH v3 3/4] of/pci: add of_pci_dma_configure() update dma configuration Murali Karicheri
2015-01-08 16:06 ` Will Deacon
2015-01-08 19:52 ` Murali Karicheri
2015-01-08 22:25 ` Arnd Bergmann
2015-01-08 22:46 ` Murali Karicheri
2015-01-09 11:32 ` Will Deacon
2015-01-07 18:49 ` [PATCH v3 4/4] PCI: update dma configuration from DT Murali Karicheri
2015-01-07 21:18 ` [PATCH v3 0/4] PCI: get DMA configuration from parent device Arnd Bergmann
2015-01-07 23:04 ` Murali Karicheri
2015-01-08 8:56 ` Arnd Bergmann
2015-01-08 15:54 ` Will Deacon
2015-01-08 22:27 ` Arnd Bergmann
2015-01-08 22:46 ` Murali Karicheri [this message]
2015-01-07 23:05 ` Murali Karicheri
2015-01-07 23:08 ` Bjorn Helgaas
2015-01-08 15:52 ` Murali Karicheri
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