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

[Xingang Wang]

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@xxxxxxxxxx>
> >
> > 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@xxxxxxxxxx>
> > ---
> >   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@xxxxxxx>
>
> .

Thanks

.