From: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org> To: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org> Cc: "linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org" <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>, "arnd-r2nGTMty4D4@public.gmane.org" <arnd-r2nGTMty4D4@public.gmane.org>, "stefano.stabellini-mvvWK6WmYclDPfheJLI6IQ@public.gmane.org" <stefano.stabellini-mvvWK6WmYclDPfheJLI6IQ@public.gmane.org>, Catalin Marinas <Catalin.Marinas-5wv7dgnIgG8@public.gmane.org>, Will Deacon <Will.Deacon-5wv7dgnIgG8@public.gmane.org>, "iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org" <iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>, "thunder.leizhen-hv44wF8Li93QT0dZR+AlfA@public.gmane.org" <thunder.leizhen-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>, "dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org" <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>, "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" <linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org> Subject: Re: [RFC PATCH 3/5] iommu: implement common IOMMU ops for DMA mapping Date: Tue, 27 Jan 2015 13:38:09 +0100 [thread overview] Message-ID: <20150127123809.GJ30345@8bytes.org> (raw) In-Reply-To: <54C7843B.3000605-5wv7dgnIgG8@public.gmane.org> On Tue, Jan 27, 2015 at 12:27:39PM +0000, Robin Murphy wrote: > Laz^WPragmatism - I'm expecting quite a lot of changes to get this > looking good, so keeping the series as lean as possible to aid > reviewing/rebasing/etc. seemed sensible. In the same vein, since the > other architectures already have code that works, my priority is > getting something in place to fill the gap in arm64 (my current > remit is "get the SMMUs on Juno working"); it seemed logical to > minimise disruption and dependencies by aiming to get this merged > with the one user, then start porting the others (and making the > inevitable necessary tweaks) once it's in. > > I'll adjust the commit message to make that clearer - on re-reading > it, it does come across as rather vague about that intent. Yeah, probably we can add other architectures later (like x86). But can you at least merge it with the existing version of this for ARM32? That should be easier to achieve than extending it for x86 by now and we do not end up with two similar implementations. > >> lib/dma-iommu.c | 455 ++++++++++++++++++++++++++++++++++++++++++++++ > > > >I'd like this to live in drivers/iommu, as most other dma-api > >implementations for iommu-drivers also live there. > > > > That's reasonable - I was trying to model this on SWIOTLB, so it > ended up in the same place. Mind you, I suppose there's a fair > argument for moving SWIOTLB over to drivers/iommu too. SWIOTLB is used outside of iommu code too, like in Xen for example. So I think it could stay in lib/. But a dma-ops implemention using iommu-api only used iommu-code and should be in drivers/iommu. > Indeed, that comment is pretty ancient and the 'proper' one was > already half-done when I posted this; It'll be in v2. Thanks. Regards, Joerg
WARNING: multiple messages have this Message-ID (diff)
From: joro@8bytes.org (Joerg Roedel) To: linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH 3/5] iommu: implement common IOMMU ops for DMA mapping Date: Tue, 27 Jan 2015 13:38:09 +0100 [thread overview] Message-ID: <20150127123809.GJ30345@8bytes.org> (raw) In-Reply-To: <54C7843B.3000605@arm.com> On Tue, Jan 27, 2015 at 12:27:39PM +0000, Robin Murphy wrote: > Laz^WPragmatism - I'm expecting quite a lot of changes to get this > looking good, so keeping the series as lean as possible to aid > reviewing/rebasing/etc. seemed sensible. In the same vein, since the > other architectures already have code that works, my priority is > getting something in place to fill the gap in arm64 (my current > remit is "get the SMMUs on Juno working"); it seemed logical to > minimise disruption and dependencies by aiming to get this merged > with the one user, then start porting the others (and making the > inevitable necessary tweaks) once it's in. > > I'll adjust the commit message to make that clearer - on re-reading > it, it does come across as rather vague about that intent. Yeah, probably we can add other architectures later (like x86). But can you at least merge it with the existing version of this for ARM32? That should be easier to achieve than extending it for x86 by now and we do not end up with two similar implementations. > >> lib/dma-iommu.c | 455 ++++++++++++++++++++++++++++++++++++++++++++++ > > > >I'd like this to live in drivers/iommu, as most other dma-api > >implementations for iommu-drivers also live there. > > > > That's reasonable - I was trying to model this on SWIOTLB, so it > ended up in the same place. Mind you, I suppose there's a fair > argument for moving SWIOTLB over to drivers/iommu too. SWIOTLB is used outside of iommu code too, like in Xen for example. So I think it could stay in lib/. But a dma-ops implemention using iommu-api only used iommu-code and should be in drivers/iommu. > Indeed, that comment is pretty ancient and the 'proper' one was > already half-done when I posted this; It'll be in v2. Thanks. Regards, Joerg
next prev parent reply other threads:[~2015-01-27 12:38 UTC|newest] Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-01-12 20:48 [RFC PATCH 0/5] arm64: IOMMU-backed DMA mapping Robin Murphy 2015-01-12 20:48 ` Robin Murphy 2015-01-13 8:02 ` Yingjoe Chen 2015-01-13 8:02 ` Yingjoe Chen 2015-01-13 12:07 ` Robin Murphy 2015-01-13 12:07 ` Robin Murphy 2015-01-15 18:35 ` Robin Murphy 2015-01-15 18:35 ` Robin Murphy 2015-01-16 7:21 ` Yong Wu 2015-01-16 7:21 ` Yong Wu 2015-01-16 20:12 ` Robin Murphy 2015-01-16 20:12 ` Robin Murphy [not found] ` <cover.1421086706.git.robin.murphy-5wv7dgnIgG8@public.gmane.org> 2015-01-12 20:48 ` [RFC PATCH 1/5] arm64: Combine coherent and non-coherent swiotlb dma_ops Robin Murphy 2015-01-12 20:48 ` Robin Murphy 2015-01-12 20:48 ` [RFC PATCH 2/5] arm64: implement generic IOMMU configuration Robin Murphy 2015-01-12 20:48 ` Robin Murphy 2015-01-12 20:48 ` [RFC PATCH 3/5] iommu: implement common IOMMU ops for DMA mapping Robin Murphy 2015-01-12 20:48 ` Robin Murphy [not found] ` <09e5515a9afcb3235f4c425520cd18a6032d31b4.1421086706.git.robin.murphy-5wv7dgnIgG8@public.gmane.org> 2015-01-23 17:42 ` Laura Abbott 2015-01-23 17:42 ` Laura Abbott [not found] ` <54C287F7.3060603-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> 2015-01-23 18:14 ` Robin Murphy 2015-01-23 18:14 ` Robin Murphy 2015-01-27 0:21 ` Joerg Roedel 2015-01-27 0:21 ` Joerg Roedel [not found] ` <20150127002116.GI30345-zLv9SwRftAIdnm+yROfE0A@public.gmane.org> 2015-01-27 12:27 ` Robin Murphy 2015-01-27 12:27 ` Robin Murphy [not found] ` <54C7843B.3000605-5wv7dgnIgG8@public.gmane.org> 2015-01-27 12:38 ` Joerg Roedel [this message] 2015-01-27 12:38 ` Joerg Roedel [not found] ` <20150127123809.GJ30345-zLv9SwRftAIdnm+yROfE0A@public.gmane.org> 2015-01-28 13:53 ` Will Deacon 2015-01-28 13:53 ` Will Deacon 2015-01-12 20:48 ` [RFC PATCH 4/5] arm64: add IOMMU dma_ops Robin Murphy 2015-01-12 20:48 ` Robin Murphy [not found] ` <aa7de3b1dd189c31eb8b14d0c0eea699183f8a2c.1421086706.git.robin.murphy-5wv7dgnIgG8@public.gmane.org> 2015-01-23 15:26 ` Will Deacon 2015-01-23 15:26 ` Will Deacon [not found] ` <20150123152605.GA31460-5wv7dgnIgG8@public.gmane.org> 2015-01-23 17:33 ` Robin Murphy 2015-01-23 17:33 ` Robin Murphy 2015-01-26 3:25 ` Joseph Lo 2015-01-26 3:25 ` Joseph Lo [not found] ` <54C5B3B9.1040300-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-01-27 17:30 ` Robin Murphy 2015-01-27 17:30 ` Robin Murphy 2015-01-26 9:10 ` Joseph Lo 2015-01-26 9:10 ` Joseph Lo 2015-01-28 2:22 ` Joseph Lo 2015-01-28 2:22 ` Joseph Lo 2015-03-05 14:31 ` Marek Szyprowski 2015-03-05 14:31 ` Marek Szyprowski 2015-01-12 20:48 ` [RFC PATCH 5/5] arm64: hook up " Robin Murphy 2015-01-12 20:48 ` Robin Murphy 2015-01-13 11:08 ` [RFC PATCH 0/5] arm64: IOMMU-backed DMA mapping Stefano Stabellini 2015-01-13 11:08 ` Stefano Stabellini [not found] ` <alpine.DEB.2.02.1501131102540.3058-7Z66fg9igcxYtxbxJUhB2Dgeux46jI+i@public.gmane.org> 2015-01-13 11:45 ` Robin Murphy 2015-01-13 11:45 ` Robin Murphy 2015-01-23 16:47 ` Catalin Marinas 2015-01-23 16:47 ` Catalin Marinas [not found] ` <20150123164759.GF9557-M2fw3Uu6cmfZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org> 2015-01-23 17:41 ` Robin Murphy 2015-01-23 17:41 ` Robin Murphy 2015-03-05 14:31 ` Marek Szyprowski 2015-03-05 14:31 ` Marek Szyprowski [not found] ` <54F868A8.7070103-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org> 2015-03-05 16:42 ` Robin Murphy 2015-03-05 16:42 ` Robin Murphy
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