It looks to me that the documentation (ACPICA programmer reference) is correct.

However, the acpiosxf.h file uses names that don't match the documentation and are not very descriptive.

The ACPICA code uses a variable named "PciRootNode" for the "DeviceHandle" parameter, that is ok.


>So it seems to me that the correct arguments for AcpiOsDerivePciId are:

>AcpiOsDerivePciId(
>    ACPI_HANDLE		PciRootHandle
>    ACPI_HANDLE		DeviceHandle
>    ACPI_PCI_ID		**PciId)


No, I don't think so. The second parameter is a handle to a region object.



>-----Original Message-----
>From: devel-bounces(a)acpica.org [mailto:devel-bounces(a)acpica.org] On Behalf
>Of Grégoire Sutre
>Sent: Tuesday, April 20, 2010 2:46 AM
>To: devel(a)acpica.org
>Subject: [Devel] Error in documentation of AcpiOsDerivePciId?
>
>Hi list,
>
>According to the ACPICA Programmer Reference, the function
>AcpiOsDerivePciId takes as arguments:
>
>AcpiOsDerivePciId(
>    ACPI_HANDLE		DeviceHandle
>    ACPI_HANDLE		PciRegionHandle
>    ACPI_PCI_ID		**PciId)
>
>with:
>- DeviceHandle:		a handle to the PCI device.
>- PciRegionHandle:	a handle the PCI configuration space operation
>                         region.
>
>
>However, the only call to AcpiOsDerivePciId in the ACPICA code, in
>events/evrgnini.c, is:
>
>AcpiOsDerivePciId (PciRootNode, RegionObj->Region.Node, &PciId);
>
>Moreover, the file include/acpiosxf.h contains:
>
>/*
>  * Interim function needed for PCI IRQ routing
>  */
>void
>AcpiOsDerivePciId(
>     ACPI_HANDLE             Rhandle,
>     ACPI_HANDLE             Chandle,
>     ACPI_PCI_ID             **PciId);
>
>
>So it seems to me that the correct arguments for AcpiOsDerivePciId are:
>
>AcpiOsDerivePciId(
>    ACPI_HANDLE		PciRootHandle
>    ACPI_HANDLE		DeviceHandle
>    ACPI_PCI_ID		**PciId)
>
>with:
>- PciRootHandle:	a handle the PCI root bridge upstream of the PCI
>                         device (or to the name space root node if no
>                         PCI root bridge was found in the ancestors).
>- DeviceHandle:		a handle to the PCI device.
>
>
>Is that correct?
>
>Thanks for your help,
>
>Grégoire
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