From: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
To: Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Cc: mark.rutland-5wv7dgnIgG8@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org,
swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org,
Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
will.deacon-5wv7dgnIgG8@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCHv7 05/12] iommu/core: add ops->{bound,unbind}_driver()
Date: Mon, 30 Dec 2013 14:45:23 +0100 [thread overview]
Message-ID: <20131230134522.GB2799@8bytes.org> (raw)
In-Reply-To: <1386835033-4701-6-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
On Thu, Dec 12, 2013 at 09:57:06AM +0200, Hiroshi Doyu wrote:
> ops->{bound,unbind}_driver() functions are called at
> BUS_NOTIFY_{BOUND,UNBIND}_DRIVER respectively.
>
> This is necessary to control the device population order. IOMMU master
> devices depend on an IOMMU device instanciation. IOMMU master devices
> can be registered to an IOMMU only after it's successfully
> populated. This IOMMU registration is done via
> ops->bound_driver(). Currently this population can be deferred if
> depending IOMMU device hasn't yet been populated in driver core. This
> cannot be done via ops->add_device() since after add_device() device's
> population/instanciation can be still deferred via probe().
How about doing dependency checking in the add/remove_device callbacks
instead? When a device is about to be initialized where the IOMMU is not
set up yet, just setup the IOMMU first before initializing the device?
Joerg
next prev parent reply other threads:[~2013-12-30 13:45 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-12 7:57 [PATCHv7 00/12] Unifying SMMU driver among Tegra SoCs Hiroshi Doyu
[not found] ` <1386835033-4701-1-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-12-12 7:57 ` [PATCHv7 01/12] of: introduce of_property_for_each_phandle_with_args() Hiroshi Doyu
[not found] ` <1386835033-4701-2-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-12-16 18:29 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 02/12] iommu/of: introduce a global iommu device list Hiroshi Doyu
[not found] ` <1386835033-4701-3-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-12-16 18:32 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 03/12] iommu/of: check if dependee iommu is ready or not Hiroshi Doyu
[not found] ` <1386835033-4701-4-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-12-16 18:34 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 04/12] driver/core: populate devices in order for IOMMUs Hiroshi Doyu
2013-12-12 7:57 ` [PATCHv7 05/12] iommu/core: add ops->{bound,unbind}_driver() Hiroshi Doyu
[not found] ` <1386835033-4701-6-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-12-16 18:42 ` Stephen Warren
2013-12-30 13:45 ` Joerg Roedel [this message]
2013-12-12 7:57 ` [PATCHv7 06/12] ARM: tegra: create a DT header defining SWGROUP ID Hiroshi Doyu
[not found] ` <1386835033-4701-7-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-12-18 8:02 ` Mark Zhang
[not found] ` <52B1568F.1050305-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-12-18 16:27 ` Stephen Warren
[not found] ` <52B1CCF1.2040907-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-12-20 12:35 ` Thierry Reding
[not found] ` <20131220123554.GQ27787-AwZRO8vwLAwmlAP/+Wk3EA@public.gmane.org>
2013-12-20 17:36 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 07/12] iommu/tegra: smmu: register device to iommu dynamically Hiroshi Doyu
[not found] ` <1386835033-4701-8-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-12-16 18:46 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 08/12] iommu/tegra: smmu: calculate ASID register offset by ID Hiroshi Doyu
[not found] ` <1386835033-4701-9-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-12-16 19:02 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 09/12] iommu/tegra: smmu: get swgroups from DT "iommus=" Hiroshi Doyu
[not found] ` <1386835033-4701-10-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-12-16 19:09 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 10/12] iommu/tegra: smmu: allow duplicate ASID wirte Hiroshi Doyu
[not found] ` <1386835033-4701-11-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-12-16 19:19 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 11/12] iommu/tegra: smmu: Rename hwgrp -> swgroups Hiroshi Doyu
2013-12-12 7:57 ` [PATCHv7 12/12] iommu/tegra: smmu: add SMMU to an global iommu list Hiroshi Doyu
[not found] ` < 1386835033-4701-5-git-send-email-hdoyu@nvidia.com>
[not found] ` <1386835033-4701-5-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-12-12 11:39 ` [PATCHv7 04/12] driver/core: populate devices in order for IOMMUs Grant Likely
[not found] ` <20131212113920.70E8BC40637-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org>
2013-12-13 2:14 ` Greg KH
[not found] ` <20131213021402.GB14192-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2013-12-14 12:24 ` Thierry Reding
2013-12-14 14:28 ` Hiroshi Doyu
2013-12-16 18:26 ` Stephen Warren
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