From mboxrd@z Thu Jan 1 00:00:00 1970 From: JeffyChen Subject: Re: [PATCH 1/9] iommu/of: Drop early initialisation hooks Date: Thu, 11 Jan 2018 19:14:38 +0800 Message-ID: <5A57471E.7020304@rock-chips.com> References: <20180111082229.24011-1-jeffy.chen@rock-chips.com> <20180111082229.24011-2-jeffy.chen@rock-chips.com> <60fdd375-ca74-0fea-c598-39a68b9e7735@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <60fdd375-ca74-0fea-c598-39a68b9e7735-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Marek Szyprowski , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Frank Rowand , linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Will Deacon , Krzysztof Kozlowski , jcliang-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org, Rob Herring , iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Kukjin Kim , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: devicetree@vger.kernel.org Hi Marek, Thanks for your reply. On 01/11/2018 05:40 PM, Marek Szyprowski wrote: > Hi Jeffy, > > On 2018-01-11 09:22, Jeffy Chen wrote: >> With the probe-deferral mechanism, early initialisation hooks are no >> longer needed. >> >> Suggested-by: Robin Murphy >> Signed-off-by: Jeffy Chen >> --- >> >> drivers/iommu/arm-smmu-v3.c | 2 +- >> drivers/iommu/arm-smmu.c | 12 ++++++------ >> drivers/iommu/exynos-iommu.c | 2 +- > > For Exynos IOMMU: > Acked-by: Marek Szyprowski > > IPMMU and MSM IOMMU are no longer multi-platform safe after this patch. > It breaks them in the same way as my commit 928055a01b3f ("iommu/exynos: > Remove custom platform device registration code") broke Exynos IOMMU. > > You need a similar fix for them: > https://www.spinics.net/lists/arm-kernel/msg627648.html hmmm, right, i did saw this fix in the rockchip iommu driver too. and there're also some other iommu drivers put bus_set_iommu in their probe() to avoid that. maybe we can do it in the iommu framework? for example: 1/ add a bus type member to struct iommu_device 2/ and a iommu_device_set_bus() 3/ do the bus_set_iommu stuff in iommu_device_register() 4/ undo bus_set_iommu in iommu_device_unregister()