2005-04-16 16:20:36 -06:00
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/*
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* PCI searching functions.
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*
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* Copyright (C) 1993 -- 1997 Drew Eckhardt, Frederic Potter,
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* David Mosberger-Tang
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* Copyright (C) 1997 -- 2000 Martin Mares <mj@ucw.cz>
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* Copyright (C) 2003 -- 2004 Greg Kroah-Hartman <greg@kroah.com>
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*/
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include "pci.h"
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2006-06-01 22:35:43 -06:00
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DECLARE_RWSEM(pci_bus_sem);
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2005-04-16 16:20:36 -06:00
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2007-03-26 23:53:30 -06:00
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static struct pci_bus *pci_do_find_bus(struct pci_bus *bus, unsigned char busnr)
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2005-04-16 16:20:36 -06:00
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{
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struct pci_bus* child;
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struct list_head *tmp;
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if(bus->number == busnr)
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return bus;
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list_for_each(tmp, &bus->children) {
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child = pci_do_find_bus(pci_bus_b(tmp), busnr);
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if(child)
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return child;
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}
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return NULL;
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}
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/**
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* pci_find_bus - locate PCI bus from a given domain and bus number
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* @domain: number of PCI domain to search
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* @busnr: number of desired PCI bus
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*
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* Given a PCI bus number and domain number, the desired PCI bus is located
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* in the global list of PCI buses. If the bus is found, a pointer to its
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* data structure is returned. If no bus is found, %NULL is returned.
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*/
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2006-07-18 15:33:16 -06:00
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struct pci_bus * pci_find_bus(int domain, int busnr)
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2005-04-16 16:20:36 -06:00
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{
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struct pci_bus *bus = NULL;
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struct pci_bus *tmp_bus;
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while ((bus = pci_find_next_bus(bus)) != NULL) {
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if (pci_domain_nr(bus) != domain)
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continue;
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tmp_bus = pci_do_find_bus(bus, busnr);
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if (tmp_bus)
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return tmp_bus;
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}
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return NULL;
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}
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/**
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* pci_find_next_bus - begin or continue searching for a PCI bus
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* @from: Previous PCI bus found, or %NULL for new search.
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*
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* Iterates through the list of known PCI busses. A new search is
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2006-07-30 04:03:41 -06:00
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* initiated by passing %NULL as the @from argument. Otherwise if
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2005-04-16 16:20:36 -06:00
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* @from is not %NULL, searches continue from next device on the
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* global list.
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*/
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struct pci_bus *
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pci_find_next_bus(const struct pci_bus *from)
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{
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struct list_head *n;
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struct pci_bus *b = NULL;
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WARN_ON(in_interrupt());
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2006-06-01 22:35:43 -06:00
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down_read(&pci_bus_sem);
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2005-04-16 16:20:36 -06:00
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n = from ? from->node.next : pci_root_buses.next;
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if (n != &pci_root_buses)
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b = pci_bus_b(n);
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2006-06-01 22:35:43 -06:00
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up_read(&pci_bus_sem);
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2005-04-16 16:20:36 -06:00
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return b;
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}
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/**
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* pci_find_slot - locate PCI device from a given PCI slot
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* @bus: number of PCI bus on which desired PCI device resides
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* @devfn: encodes number of PCI slot in which the desired PCI
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* device resides and the logical device number within that slot
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* in case of multi-function devices.
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*
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* Given a PCI bus and slot/function number, the desired PCI device
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* is located in system global list of PCI devices. If the device
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* is found, a pointer to its data structure is returned. If no
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* device is found, %NULL is returned.
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*/
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struct pci_dev *
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pci_find_slot(unsigned int bus, unsigned int devfn)
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{
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struct pci_dev *dev = NULL;
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while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
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if (dev->bus->number == bus && dev->devfn == devfn)
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return dev;
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}
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return NULL;
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}
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/**
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* pci_get_slot - locate PCI device for a given PCI slot
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* @bus: PCI bus on which desired PCI device resides
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* @devfn: encodes number of PCI slot in which the desired PCI
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* device resides and the logical device number within that slot
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* in case of multi-function devices.
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*
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* Given a PCI bus and slot/function number, the desired PCI device
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* is located in the list of PCI devices.
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* If the device is found, its reference count is increased and this
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* function returns a pointer to its data structure. The caller must
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* decrement the reference count by calling pci_dev_put().
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* If no device is found, %NULL is returned.
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*/
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struct pci_dev * pci_get_slot(struct pci_bus *bus, unsigned int devfn)
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{
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struct list_head *tmp;
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struct pci_dev *dev;
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WARN_ON(in_interrupt());
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2006-06-01 22:35:43 -06:00
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down_read(&pci_bus_sem);
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2005-04-16 16:20:36 -06:00
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list_for_each(tmp, &bus->devices) {
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dev = pci_dev_b(tmp);
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if (dev->devfn == devfn)
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goto out;
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}
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dev = NULL;
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out:
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pci_dev_get(dev);
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2006-06-01 22:35:43 -06:00
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up_read(&pci_bus_sem);
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2005-04-16 16:20:36 -06:00
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return dev;
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}
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2006-10-16 17:20:21 -06:00
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/**
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2007-06-28 17:04:21 -06:00
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* pci_get_bus_and_slot - locate PCI device from a given PCI bus & slot
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2006-10-16 17:20:21 -06:00
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* @bus: number of PCI bus on which desired PCI device resides
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* @devfn: encodes number of PCI slot in which the desired PCI
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* device resides and the logical device number within that slot
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* in case of multi-function devices.
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*
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2007-06-28 17:04:21 -06:00
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* Note: the bus/slot search is limited to PCI domain (segment) 0.
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*
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2006-10-16 17:20:21 -06:00
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* Given a PCI bus and slot/function number, the desired PCI device
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* is located in system global list of PCI devices. If the device
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* is found, a pointer to its data structure is returned. If no
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* device is found, %NULL is returned. The returned device has its
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* reference count bumped by one.
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*/
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struct pci_dev * pci_get_bus_and_slot(unsigned int bus, unsigned int devfn)
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{
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struct pci_dev *dev = NULL;
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while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
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2007-06-28 17:04:21 -06:00
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if (pci_domain_nr(dev->bus) == 0 &&
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(dev->bus->number == bus && dev->devfn == devfn))
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2006-10-16 17:20:21 -06:00
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return dev;
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}
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return NULL;
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}
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2005-04-16 16:20:36 -06:00
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/**
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* pci_find_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevice id
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* @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids
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* @device: PCI device id to match, or %PCI_ANY_ID to match all device ids
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* @ss_vendor: PCI subsystem vendor id to match, or %PCI_ANY_ID to match all vendor ids
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* @ss_device: PCI subsystem device id to match, or %PCI_ANY_ID to match all device ids
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* @from: Previous PCI device found in search, or %NULL for new search.
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*
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* Iterates through the list of known PCI devices. If a PCI device is
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2006-07-30 04:03:41 -06:00
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* found with a matching @vendor, @device, @ss_vendor and @ss_device, a
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* pointer to its device structure is returned. Otherwise, %NULL is returned.
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* A new search is initiated by passing %NULL as the @from argument.
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* Otherwise if @from is not %NULL, searches continue from next device
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* on the global list.
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2005-04-16 16:20:36 -06:00
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*
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2006-07-30 04:03:41 -06:00
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* NOTE: Do not use this function any more; use pci_get_subsys() instead, as
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* the PCI device returned by this function can disappear at any moment in
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2005-04-16 16:20:36 -06:00
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* time.
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*/
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static struct pci_dev * pci_find_subsys(unsigned int vendor,
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unsigned int device,
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unsigned int ss_vendor,
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unsigned int ss_device,
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const struct pci_dev *from)
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{
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struct list_head *n;
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struct pci_dev *dev;
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WARN_ON(in_interrupt());
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2007-01-05 17:36:21 -07:00
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/*
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* pci_find_subsys() can be called on the ide_setup() path, super-early
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* in boot. But the down_read() will enable local interrupts, which
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* can cause some machines to crash. So here we detect and flag that
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* situation and bail out early.
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*/
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2007-02-01 00:48:13 -07:00
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if (unlikely(list_empty(&pci_devices)))
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2007-01-05 17:36:21 -07:00
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return NULL;
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2006-06-01 22:35:43 -06:00
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down_read(&pci_bus_sem);
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2005-04-16 16:20:36 -06:00
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n = from ? from->global_list.next : pci_devices.next;
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while (n && (n != &pci_devices)) {
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dev = pci_dev_g(n);
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if ((vendor == PCI_ANY_ID || dev->vendor == vendor) &&
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(device == PCI_ANY_ID || dev->device == device) &&
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(ss_vendor == PCI_ANY_ID || dev->subsystem_vendor == ss_vendor) &&
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(ss_device == PCI_ANY_ID || dev->subsystem_device == ss_device))
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goto exit;
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n = n->next;
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}
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dev = NULL;
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exit:
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2006-06-01 22:35:43 -06:00
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up_read(&pci_bus_sem);
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2005-04-16 16:20:36 -06:00
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return dev;
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}
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/**
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* pci_find_device - begin or continue searching for a PCI device by vendor/device id
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* @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids
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* @device: PCI device id to match, or %PCI_ANY_ID to match all device ids
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* @from: Previous PCI device found in search, or %NULL for new search.
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*
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2006-07-30 04:03:41 -06:00
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* Iterates through the list of known PCI devices. If a PCI device is found
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* with a matching @vendor and @device, a pointer to its device structure is
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2005-04-16 16:20:36 -06:00
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* returned. Otherwise, %NULL is returned.
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2006-07-30 04:03:41 -06:00
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* A new search is initiated by passing %NULL as the @from argument.
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* Otherwise if @from is not %NULL, searches continue from next device
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* on the global list.
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2005-04-16 16:20:36 -06:00
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*
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2006-07-30 04:03:41 -06:00
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* NOTE: Do not use this function any more; use pci_get_device() instead, as
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* the PCI device returned by this function can disappear at any moment in
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2005-04-16 16:20:36 -06:00
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* time.
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*/
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struct pci_dev *
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pci_find_device(unsigned int vendor, unsigned int device, const struct pci_dev *from)
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{
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return pci_find_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from);
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}
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/**
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* pci_get_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevice id
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* @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids
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* @device: PCI device id to match, or %PCI_ANY_ID to match all device ids
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* @ss_vendor: PCI subsystem vendor id to match, or %PCI_ANY_ID to match all vendor ids
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* @ss_device: PCI subsystem device id to match, or %PCI_ANY_ID to match all device ids
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* @from: Previous PCI device found in search, or %NULL for new search.
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*
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2006-07-30 04:03:41 -06:00
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* Iterates through the list of known PCI devices. If a PCI device is found
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* with a matching @vendor, @device, @ss_vendor and @ss_device, a pointer to its
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2005-04-16 16:20:36 -06:00
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* device structure is returned, and the reference count to the device is
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* incremented. Otherwise, %NULL is returned. A new search is initiated by
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2006-07-30 04:03:41 -06:00
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* passing %NULL as the @from argument. Otherwise if @from is not %NULL,
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2005-04-16 16:20:36 -06:00
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* searches continue from next device on the global list.
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* The reference count for @from is always decremented if it is not %NULL.
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*/
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struct pci_dev *
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pci_get_subsys(unsigned int vendor, unsigned int device,
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unsigned int ss_vendor, unsigned int ss_device,
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struct pci_dev *from)
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{
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struct list_head *n;
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struct pci_dev *dev;
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WARN_ON(in_interrupt());
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2007-01-05 17:36:21 -07:00
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/*
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* pci_get_subsys() can potentially be called by drivers super-early
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* in boot. But the down_read() will enable local interrupts, which
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* can cause some machines to crash. So here we detect and flag that
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* situation and bail out early.
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*/
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2007-02-01 00:48:13 -07:00
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if (unlikely(list_empty(&pci_devices)))
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2007-01-05 17:36:21 -07:00
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return NULL;
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2006-06-01 22:35:43 -06:00
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down_read(&pci_bus_sem);
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2005-04-16 16:20:36 -06:00
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n = from ? from->global_list.next : pci_devices.next;
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while (n && (n != &pci_devices)) {
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dev = pci_dev_g(n);
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if ((vendor == PCI_ANY_ID || dev->vendor == vendor) &&
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(device == PCI_ANY_ID || dev->device == device) &&
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(ss_vendor == PCI_ANY_ID || dev->subsystem_vendor == ss_vendor) &&
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(ss_device == PCI_ANY_ID || dev->subsystem_device == ss_device))
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goto exit;
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n = n->next;
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}
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dev = NULL;
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exit:
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dev = pci_dev_get(dev);
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2006-06-01 22:35:43 -06:00
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up_read(&pci_bus_sem);
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2006-02-23 15:12:51 -07:00
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pci_dev_put(from);
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2005-04-16 16:20:36 -06:00
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return dev;
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}
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/**
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* pci_get_device - begin or continue searching for a PCI device by vendor/device id
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* @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids
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* @device: PCI device id to match, or %PCI_ANY_ID to match all device ids
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* @from: Previous PCI device found in search, or %NULL for new search.
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*
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* Iterates through the list of known PCI devices. If a PCI device is
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* found with a matching @vendor and @device, the reference count to the
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* device is incremented and a pointer to its device structure is returned.
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* Otherwise, %NULL is returned. A new search is initiated by passing %NULL
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2006-07-30 04:03:41 -06:00
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* as the @from argument. Otherwise if @from is not %NULL, searches continue
|
2005-04-16 16:20:36 -06:00
|
|
|
* from next device on the global list. The reference count for @from is
|
|
|
|
* always decremented if it is not %NULL.
|
|
|
|
*/
|
|
|
|
struct pci_dev *
|
|
|
|
pci_get_device(unsigned int vendor, unsigned int device, struct pci_dev *from)
|
|
|
|
{
|
|
|
|
return pci_get_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from);
|
|
|
|
}
|
|
|
|
|
2006-10-16 17:20:21 -06:00
|
|
|
/**
|
|
|
|
* pci_get_device_reverse - begin or continue searching for a PCI device by vendor/device id
|
|
|
|
* @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids
|
|
|
|
* @device: PCI device id to match, or %PCI_ANY_ID to match all device ids
|
|
|
|
* @from: Previous PCI device found in search, or %NULL for new search.
|
|
|
|
*
|
|
|
|
* Iterates through the list of known PCI devices in the reverse order of
|
|
|
|
* pci_get_device.
|
|
|
|
* If a PCI device is found with a matching @vendor and @device, the reference
|
|
|
|
* count to the device is incremented and a pointer to its device structure
|
|
|
|
* is returned Otherwise, %NULL is returned. A new search is initiated by
|
|
|
|
* passing %NULL as the @from argument. Otherwise if @from is not %NULL,
|
|
|
|
* searches continue from next device on the global list. The reference
|
|
|
|
* count for @from is always decremented if it is not %NULL.
|
|
|
|
*/
|
|
|
|
struct pci_dev *
|
|
|
|
pci_get_device_reverse(unsigned int vendor, unsigned int device, struct pci_dev *from)
|
|
|
|
{
|
|
|
|
struct list_head *n;
|
|
|
|
struct pci_dev *dev;
|
|
|
|
|
|
|
|
WARN_ON(in_interrupt());
|
|
|
|
down_read(&pci_bus_sem);
|
|
|
|
n = from ? from->global_list.prev : pci_devices.prev;
|
|
|
|
|
|
|
|
while (n && (n != &pci_devices)) {
|
|
|
|
dev = pci_dev_g(n);
|
|
|
|
if ((vendor == PCI_ANY_ID || dev->vendor == vendor) &&
|
|
|
|
(device == PCI_ANY_ID || dev->device == device))
|
|
|
|
goto exit;
|
|
|
|
n = n->prev;
|
|
|
|
}
|
|
|
|
dev = NULL;
|
|
|
|
exit:
|
|
|
|
dev = pci_dev_get(dev);
|
|
|
|
up_read(&pci_bus_sem);
|
|
|
|
pci_dev_put(from);
|
|
|
|
return dev;
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/**
|
|
|
|
* pci_get_class - begin or continue searching for a PCI device by class
|
|
|
|
* @class: search for a PCI device with this class designation
|
|
|
|
* @from: Previous PCI device found in search, or %NULL for new search.
|
|
|
|
*
|
|
|
|
* Iterates through the list of known PCI devices. If a PCI device is
|
|
|
|
* found with a matching @class, the reference count to the device is
|
|
|
|
* incremented and a pointer to its device structure is returned.
|
|
|
|
* Otherwise, %NULL is returned.
|
2006-07-30 04:03:41 -06:00
|
|
|
* A new search is initiated by passing %NULL as the @from argument.
|
2005-04-16 16:20:36 -06:00
|
|
|
* Otherwise if @from is not %NULL, searches continue from next device
|
|
|
|
* on the global list. The reference count for @from is always decremented
|
|
|
|
* if it is not %NULL.
|
|
|
|
*/
|
|
|
|
struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from)
|
|
|
|
{
|
|
|
|
struct list_head *n;
|
|
|
|
struct pci_dev *dev;
|
|
|
|
|
|
|
|
WARN_ON(in_interrupt());
|
2006-06-01 22:35:43 -06:00
|
|
|
down_read(&pci_bus_sem);
|
2005-04-16 16:20:36 -06:00
|
|
|
n = from ? from->global_list.next : pci_devices.next;
|
|
|
|
|
|
|
|
while (n && (n != &pci_devices)) {
|
|
|
|
dev = pci_dev_g(n);
|
|
|
|
if (dev->class == class)
|
|
|
|
goto exit;
|
|
|
|
n = n->next;
|
|
|
|
}
|
|
|
|
dev = NULL;
|
|
|
|
exit:
|
|
|
|
dev = pci_dev_get(dev);
|
2006-06-01 22:35:43 -06:00
|
|
|
up_read(&pci_bus_sem);
|
2006-02-23 15:12:51 -07:00
|
|
|
pci_dev_put(from);
|
2005-04-16 16:20:36 -06:00
|
|
|
return dev;
|
|
|
|
}
|
|
|
|
|
2006-12-04 16:14:44 -07:00
|
|
|
const struct pci_device_id *pci_find_present(const struct pci_device_id *ids)
|
|
|
|
{
|
|
|
|
struct pci_dev *dev;
|
2006-12-04 16:14:45 -07:00
|
|
|
const struct pci_device_id *found = NULL;
|
2006-12-04 16:14:44 -07:00
|
|
|
|
|
|
|
WARN_ON(in_interrupt());
|
|
|
|
down_read(&pci_bus_sem);
|
|
|
|
while (ids->vendor || ids->subvendor || ids->class_mask) {
|
|
|
|
list_for_each_entry(dev, &pci_devices, global_list) {
|
|
|
|
if ((found = pci_match_one_device(ids, dev)) != NULL)
|
2007-05-10 23:58:58 -06:00
|
|
|
goto exit;
|
2006-12-04 16:14:44 -07:00
|
|
|
}
|
|
|
|
ids++;
|
|
|
|
}
|
2007-05-10 23:58:58 -06:00
|
|
|
exit:
|
2006-12-04 16:14:44 -07:00
|
|
|
up_read(&pci_bus_sem);
|
|
|
|
return found;
|
|
|
|
}
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/**
|
|
|
|
* pci_dev_present - Returns 1 if device matching the device list is present, 0 if not.
|
|
|
|
* @ids: A pointer to a null terminated list of struct pci_device_id structures
|
|
|
|
* that describe the type of PCI device the caller is trying to find.
|
|
|
|
*
|
|
|
|
* Obvious fact: You do not have a reference to any device that might be found
|
|
|
|
* by this function, so if that device is removed from the system right after
|
|
|
|
* this function is finished, the value will be stale. Use this function to
|
|
|
|
* find devices that are usually built into a system, or for a general hint as
|
|
|
|
* to if another device happens to be present at this specific moment in time.
|
|
|
|
*/
|
|
|
|
int pci_dev_present(const struct pci_device_id *ids)
|
|
|
|
{
|
2006-12-04 16:14:44 -07:00
|
|
|
return pci_find_present(ids) == NULL ? 0 : 1;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2006-12-04 16:14:44 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
EXPORT_SYMBOL(pci_dev_present);
|
2006-12-04 16:14:44 -07:00
|
|
|
EXPORT_SYMBOL(pci_find_present);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
EXPORT_SYMBOL(pci_find_device);
|
|
|
|
EXPORT_SYMBOL(pci_find_slot);
|
2006-10-16 17:20:21 -06:00
|
|
|
/* For boot time work */
|
|
|
|
EXPORT_SYMBOL(pci_find_bus);
|
|
|
|
EXPORT_SYMBOL(pci_find_next_bus);
|
|
|
|
/* For everyone */
|
2005-04-16 16:20:36 -06:00
|
|
|
EXPORT_SYMBOL(pci_get_device);
|
2006-10-16 17:20:21 -06:00
|
|
|
EXPORT_SYMBOL(pci_get_device_reverse);
|
2005-04-16 16:20:36 -06:00
|
|
|
EXPORT_SYMBOL(pci_get_subsys);
|
|
|
|
EXPORT_SYMBOL(pci_get_slot);
|
2006-10-16 17:20:21 -06:00
|
|
|
EXPORT_SYMBOL(pci_get_bus_and_slot);
|
2005-04-16 16:20:36 -06:00
|
|
|
EXPORT_SYMBOL(pci_get_class);
|