is that still in the agenda ? Also, what is the reason why the last
parameter of AcpiOsDerivePciId() is "ACPI_PCI_ID **" and not just
"ACPI_PCI_ID *" ? Are there any situations, where AcpiOsDerivePciId
would want to reallocate PciId ?
Lin Ming wrote:
2010/4/22 Grégoire Sutre <gregoire.sutre(a)gmail.com>:
> Hi Lin,
> Many thanks for your explanantion, I understand now why the second
> argument passed to AcpiOsDerivePciId is a handle to the (PCI_Config)
> operation region.
> But regarding the first argument of AcpiOsDerivePciId: the ACPICA
> programmer reference says that: it is a handle to _the PCI device_.
> My question is: which PCI device?
> In my (possibly wrong) interpretation of the documentation, _the PCI
> device_ is the device for which AcpiOsDerivePciId shall return an
> updated Pci id.
> However, as far as I understand the code of AcpiEvPciConfigRegionSetup
> (in file evrgnini.c), _the PCI device_ turns out to be an ancestor of
> the device for which AcpiOsDerivePciId shall return an updated Pci id.
> This ancestor being the upstream PCI root bridge (or the ACPI root node
> if none was found). This interpretation of _the PCI device_ is also
> consistent with my understanding of the Linux implementation of
> AcpiOsDerivePciId, which finds the updated PCI id by ``traversing'' the
> PCI-to-PCI bridges that are on the branch from AcpiOsDerivePciId's first
> argument to its second argument.
You are right, the first argument is the PCI root node.
We may need to update the doc to figure out this.
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Ruediger "Rudi" Ihle
"There's a fine line between wrong and visionary. Unfortunately
you have to be a visionary to see it." - Sheldon Cooper, Ph.D.