linux-kernel - Re: [PATCH RESEND] iommu/of: Fix pci_request

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Message-ID: <2024110759-refusal-mayflower-2522@gregkh>
Date: Thu, 7 Nov 2024 09:17:44 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Pavankumar Kondeti <quic_pkondeti@...cinc.com>
Cc: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, Joerg Roedel <jroedel@...e.de>,
	Rob Herring <robh@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Anders Roxell <anders.roxell@...aro.org>, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Xingang Wang <wangxingang5@...wei.com>
Subject: Re: [PATCH RESEND] iommu/of: Fix pci_request_acs() before
 enumerating PCI devices

On Thu, Nov 07, 2024 at 01:29:15PM +0530, Pavankumar Kondeti wrote:
> From: Xingang Wang <wangxingang5@...wei.com>
> 
> When booting with devicetree, the pci_request_acs() is called after the
> enumeration and initialization of PCI devices, thus the ACS is not
> enabled. And ACS should be enabled when IOMMU is detected for the
> PCI host bridge, so add check for IOMMU before probe of PCI host and call
> pci_request_acs() to make sure ACS will be enabled when enumerating PCI
> devices.
> 
> Fixes: 6bf6c24720d33 ("iommu/of: Request ACS from the PCI core when configuring IOMMU linkage")
> Signed-off-by: Xingang Wang <wangxingang5@...wei.com>
> Signed-off-by: Pavankumar Kondeti <quic_pkondeti@...cinc.com>
> ---
> Earlier this patch made it to linux-next but got dropped later as it
> broke PCI on ARM Juno R1 board. AFAICT, this issue is never root caused,
> so resending this patch to get attention again.
> 
> https://lore.kernel.org/all/1621566204-37456-1-git-send-email-wangxingang5@huawei.com/

Please don't resend known-broken patches.  Please fix them up before
resending, otherwise we will just ignore this one as well as obviously
we can not take such a thing (nor should you want us to.)

thanks,

greg k-h