linux-kernel - Re: [PATCH v4] iommu/of: Fix pci_request_acs() before enumerating PCI devices

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Date:   Mon, 7 Jun 2021 20:43:53 +0800
From:   Xingang Wang <wangxingang5@...wei.com>
To:     Joerg Roedel <joro@...tes.org>
CC:     <robh@...nel.org>, <will@...nel.org>, <helgaas@...nel.org>,
        <robh+dt@...nel.org>, <gregkh@...uxfoundation.org>,
        <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <xieyingtai@...wei.com>
Subject: Re: [PATCH v4] iommu/of: Fix pci_request_acs() before enumerating PCI
 devices

On 2021/6/4 23:36, Joerg Roedel wrote:
> On Fri, May 21, 2021 at 03:03:24AM +0000, Wang Xingang 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>
>> ---
>>   drivers/iommu/of_iommu.c | 1 -
>>   drivers/pci/of.c         | 8 +++++++-
>>   2 files changed, 7 insertions(+), 2 deletions(-)
> 
> Should probably go through the PCI tree, so
> 
> Acked-by: Joerg Roedel <jroedel@...e.de>
> 
> .
> 

Thanks

.