From: Marek Szyprowski <m.szyprowski@samsung.com>
To: "'Hiroshi Doyu'" <hdoyu@nvidia.com>,
"'James Bottomley'" <James.Bottomley@HansenPartnership.com>
Cc: "'Stephen Warren'" <swarren@wwwdotorg.org>,
"'Joerg Roedel'" <joerg.roedel@amd.com>,
"'Arnd Bergmann'" <arnd@arndb.de>,
"'Krishna Reddy'" <vdumpa@nvidia.com>,
linux@arm.linux.org.uk, minchan@kernel.org,
chunsang.jeong@linaro.org, linux-kernel@vger.kernel.org,
subashrp@gmail.com, linaro-mm-sig@lists.linaro.org,
linux-mm@kvack.org, iommu@lists.linux-foundation.org,
linux-tegra@vger.kernel.org, kyungmin.park@samsung.com,
pullip.cho@samsung.com, linux-arm-kernel@lists.infradead.org
Subject: RE: How to specify IOMMU'able devices in DT (was: [RFC 0/5] ARM: dma-mapping: New dma_map_ops to control IOVA more precisely)
Date: Mon, 24 Sep 2012 13:14:51 +0200 [thread overview]
Message-ID: <054901cd9a45$db1a7ea0$914f7be0$%szyprowski@samsung.com> (raw)
In-Reply-To: <20120924124452.41070ed2ee9944d930cffffc@nvidia.com>
Hello,
On Monday, September 24, 2012 11:45 AM Hiroshi Doyu wrote:
> On Mon, 24 Sep 2012 11:28:01 +0200
> James Bottomley <James.Bottomley@HansenPartnership.com> wrote:
>
> > On Mon, 2012-09-24 at 12:04 +0300, Hiroshi Doyu wrote:
> > > diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> > > index a1a7225..9eae3be 100644
> > > --- a/drivers/base/platform.c
> > > +++ b/drivers/base/platform.c
> > > @@ -21,6 +21,8 @@
> > > #include <linux/slab.h>
> > > #include <linux/pm_runtime.h>
> > >
> > > +#include <asm/dma-iommu.h>
> > > +
> > > #include "base.h"
> > >
> > > #define to_platform_driver(drv) (container_of((drv), struct
> > > platform_driver, \
> > > @@ -305,8 +307,19 @@ int platform_device_add(struct platform_device
> > > *pdev)
> > > dev_name(&pdev->dev), dev_name(pdev->dev.parent));
> > >
> > > ret = device_add(&pdev->dev);
> > > - if (ret == 0)
> > > - return ret;
> > > + if (ret)
> > > + goto failed;
> > > +
> > > +#ifdef CONFIG_PLATFORM_ENABLE_IOMMU
> > > + if (platform_bus_type.map && !pdev->dev.archdata.mapping) {
> > > + ret = arm_iommu_attach_device(&pdev->dev,
> > > + platform_bus_type.map);
> > > + if (ret)
> > > + goto failed;
> >
> > This is horrible ... you're adding an architecture specific callback
> > into our generic code; that's really a no-no. If the concept of
> > CONFIG_PLATFORM_ENABE_IOMMU is useful to more than just arm, then this
> > could become a generic callback.
>
> As mentioned in the original, this is a heck to explain what is
> needed. I am looking for some generic solution for how to specify
> IOMMU info for each platform devices. I'm guessing that some other SoC
> may have the similar requirements on the above. As you mentioned, this
> solution should be a generic, not arch specific.
Please read more about bus notifiers. IMHO a good example is provided in
the following thread:
http://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg12238.html
Best regards
--
Marek Szyprowski
Samsung Poland R&D Center
next prev parent reply other threads:[~2012-09-24 11:15 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
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 [this message]
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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