[PATCH v9 4/4] PCI: hisi: blacklist hip06/hip07 controllers behind SMMUv3

[Bjorn Helgaas]

On Mon, Oct 09, 2017 at 06:54:52PM -0500, Bjorn Helgaas wrote:
> Please change subject line:
> 
> -  PCI: hisi: blacklist hip06/hip07 controllers behind SMMUv3
> +  PCI: hisi: Blacklist hip06/hip07 controllers behind SMMUv3
> 
> On Fri, Oct 06, 2017 at 03:04:50PM +0100, Shameer Kolothum wrote:
> > The HiSilicon erratum 161010801 describes the limitation of
> > HiSilicon platforms hip06/hip07 to support the SMMUv3 mappings
> > for MSI transactions.
> 
> I don't suppose there's a URL for this erratum, is there?
> 
> > PCIe controller on these platforms has to differentiate the MSI
> > payload against other DMA payload and has to modify the MSI
> > payload. This basically makes it difficult for this platforms to
> > have a SMMU translation for MSI. In order to workaround this, ARM
> > SMMUv3 driver requires a quirk to treat the MSI regions separately.
> > Such a quirk is currently missing for DT based systems and therefore
> > we need to blacklist the hip06/hip07 PCIe controllers.
> 
> I don't understand the DT connection here.  If this is a hardware
> erratum, I assume the a quirk would be required whether the system
> uses DT, ACPI, etc.
> 
> > Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi at huawei.com>
> 
> I assume this will go via some non-PCI tree.  If I were applying this,
> I would look for an ack from Zhou or Gabriele in addition to mine.

Never mind about this part; I see they already have acked it.  I really
need to learn to read the whole thread before responding :)