PCI question

From: Pat Gefre <pfg_at_sgi.com>
Date: 2004-02-04 09:35:26
The usage of pci_dev.sysdata is a bit confusing to me. I had initially
thought that this was available for any system specific use,  but then
in pcibios_fixup_device_resources() it is specifically cast as a struct
pci_controller *:

#define PCI_CONTROLLER(busdev) ((struct pci_controller *) busdev->sysdata)

void __init
pcibios_fixup_device_resources (struct pci_dev *dev, struct pci_bus *bus)
   struct pci_controller *controller = PCI_CONTROLLER(dev);

In this funtion  the pci_controller elements 'window[]' and 'windows'
are also used.  This implies to me that these fields must be maintained
in any system specific structure ? i.e.

struct my_sysdata_struct {
   struct pci_controller dummy;
   /* my stuff would go here */
   struct my_real_sysdata_stuff;

Yet I don't see where anyone else is doing the above. Am I missing
something obvious ??

-- Pat

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Received on Tue Feb 3 17:36:08 2004

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