From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
To: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
Cc: mark.rutland-5wv7dgnIgG8@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
stuyoder-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org,
catalin.marinas-5wv7dgnIgG8@public.gmane.org,
linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
will.deacon-5wv7dgnIgG8@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
leoyang.li-3arQi8VN3Tc@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
shawnguo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH 5/6] dma-mapping: support fsl-mc bus
Date: Mon, 5 Mar 2018 19:39:38 +0100 [thread overview]
Message-ID: <20180305183938.GB20086@lst.de> (raw)
In-Reply-To: <7b4f9972-6aaa-fc9d-3854-d48b19a8051c-5wv7dgnIgG8@public.gmane.org>
On Mon, Mar 05, 2018 at 03:48:32PM +0000, Robin Murphy wrote:
> Unfortunately for us, fsl-mc is conceptually rather like PCI in that it's
> software-discoverable and the only thing described in DT is the bus "host",
> thus we need the same sort of thing as for PCI to map from the child
> devices back to the bus root in order to find the appropriate firmware
> node. Worse than PCI, though, we wouldn't even have the option of
> describing child devices statically in firmware at all, since it's actually
> one of these runtime-configurable "build your own network accelerator"
> hardware pools where userspace gets to create and destroy "devices" as it
> likes.
I really hate the PCI special case just as much. Maybe we just
need a dma_configure method on the bus, and move PCI as well as fsl-mc
to it.
next prev parent reply other threads:[~2018-03-05 18:39 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-05 14:29 [PATCH 0/6] Support for fsl-mc bus and its devices in SMMU Nipun Gupta
[not found] ` <1520260166-29387-1-git-send-email-nipun.gupta-3arQi8VN3Tc@public.gmane.org>
2018-03-05 14:29 ` [PATCH 1/6] Docs: dt: add fsl-mc iommu-parent device-tree binding Nipun Gupta
2018-03-05 14:53 ` Robin Murphy
2018-03-05 15:00 ` Nipun Gupta
[not found] ` <HE1PR0401MB24254CBDB8B6F537D08B925DE6DA0-B0v07Ae2taqTjcJO+iVGAo3W/0Ik+aLCnBOFsp37pqbUKgpGm//BTAC/G2K4zDHf@public.gmane.org>
2018-03-05 15:37 ` Robin Murphy
2018-03-05 15:54 ` Nipun Gupta
[not found] ` <1520260166-29387-2-git-send-email-nipun.gupta-3arQi8VN3Tc@public.gmane.org>
2018-03-07 22:40 ` Rob Herring
2018-03-08 12:32 ` Nipun Gupta
2018-03-05 14:29 ` [PATCH 2/6] iommu: support iommu configuration for fsl-mc devices Nipun Gupta
2018-03-05 14:29 ` [PATCH 3/6] iommu: arm-smmu: Add support for the fsl-mc bus Nipun Gupta
2018-03-05 14:29 ` [PATCH 4/6] bus: fsl-mc: remove dma ops setup from driver Nipun Gupta
2018-03-05 14:29 ` [PATCH 5/6] dma-mapping: support fsl-mc bus Nipun Gupta
2018-03-05 15:08 ` Christoph Hellwig
[not found] ` <20180305150814.GA15918-jcswGhMUV9g@public.gmane.org>
2018-03-05 15:48 ` Robin Murphy
[not found] ` <7b4f9972-6aaa-fc9d-3854-d48b19a8051c-5wv7dgnIgG8@public.gmane.org>
2018-03-05 18:39 ` Christoph Hellwig [this message]
[not found] ` <20180305183938.GB20086-jcswGhMUV9g@public.gmane.org>
2018-03-05 18:51 ` Robin Murphy
2018-03-06 4:41 ` Nipun Gupta
2018-03-08 7:41 ` Christoph Hellwig
[not found] ` <20180308074115.GB15748-jcswGhMUV9g@public.gmane.org>
2018-03-09 18:29 ` Nipun Gupta
[not found] ` <HE1PR0401MB2425871215B13AD0EFDCA5C3E6DE0-B0v07Ae2taqTjcJO+iVGAo3W/0Ik+aLCnBOFsp37pqbUKgpGm//BTAC/G2K4zDHf@public.gmane.org>
2018-03-09 18:50 ` Robin Murphy
2018-03-05 14:29 ` [PATCH 6/6] dts: fsl-ls208x: updated DT with SMMU support for fsl-mc Nipun Gupta
2018-04-17 10:21 ` [PATCH 0/6 v2] Support for fsl-mc bus and its devices in SMMU Nipun Gupta
[not found] ` <1523960514-25457-1-git-send-email-nipun.gupta-3arQi8VN3Tc@public.gmane.org>
2018-04-17 10:21 ` [PATCH 1/6 v2] Docs: dt: add fsl-mc iommu-map device-tree binding Nipun Gupta
2018-04-17 10:21 ` [PATCH 2/6 v2] iommu: of: make of_pci_map_rid() available for other devices too Nipun Gupta
[not found] ` <1523960514-25457-3-git-send-email-nipun.gupta-3arQi8VN3Tc@public.gmane.org>
2018-04-17 16:52 ` Robin Murphy
[not found] ` <41b32766-e21a-e946-6c8f-440e5c87d0ee-5wv7dgnIgG8@public.gmane.org>
2018-04-18 5:09 ` Bharat Bhushan
2018-04-18 6:21 ` Nipun Gupta
2018-04-17 10:21 ` [PATCH 3/6 v2] iommu: support iommu configuration for fsl-mc devices Nipun Gupta
2018-04-17 10:21 ` [PATCH 4/6 v2] iommu: arm-smmu: Add support for the fsl-mc bus Nipun Gupta
2018-04-17 10:21 ` [PATCH 5/6 v2] bus: fsl-mc: supoprt dma configure for devices on " Nipun Gupta
[not found] ` <1523960514-25457-6-git-send-email-nipun.gupta-3arQi8VN3Tc@public.gmane.org>
2018-04-26 0:00 ` kbuild test robot
2018-04-17 10:21 ` [PATCH 6/6 v2] arm64: dts: ls208xa: comply with the iommu map binding for fsl_mc Nipun Gupta
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