diff options
Diffstat (limited to 'drivers/pci/search.c')
| -rw-r--r-- | drivers/pci/search.c | 388 |
1 files changed, 388 insertions, 0 deletions
diff --git a/drivers/pci/search.c b/drivers/pci/search.c new file mode 100644 index 00000000000..a90a533eba0 --- /dev/null +++ b/drivers/pci/search.c @@ -0,0 +1,388 @@ +/* + * PCI searching functions. + * + * Copyright (C) 1993 -- 1997 Drew Eckhardt, Frederic Potter, + * David Mosberger-Tang + * Copyright (C) 1997 -- 2000 Martin Mares <mj@ucw.cz> + * Copyright (C) 2003 -- 2004 Greg Kroah-Hartman <greg@kroah.com> + */ + +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include "pci.h" + +DEFINE_SPINLOCK(pci_bus_lock); + +static struct pci_bus * __devinit +pci_do_find_bus(struct pci_bus* bus, unsigned char busnr) +{ + struct pci_bus* child; + struct list_head *tmp; + + if(bus->number == busnr) + return bus; + + list_for_each(tmp, &bus->children) { + child = pci_do_find_bus(pci_bus_b(tmp), busnr); + if(child) + return child; + } + return NULL; +} + +/** + * pci_find_bus - locate PCI bus from a given domain and bus number + * @domain: number of PCI domain to search + * @busnr: number of desired PCI bus + * + * Given a PCI bus number and domain number, the desired PCI bus is located + * in the global list of PCI buses. If the bus is found, a pointer to its + * data structure is returned. If no bus is found, %NULL is returned. + */ +struct pci_bus * __devinit pci_find_bus(int domain, int busnr) +{ + struct pci_bus *bus = NULL; + struct pci_bus *tmp_bus; + + while ((bus = pci_find_next_bus(bus)) != NULL) { + if (pci_domain_nr(bus) != domain) + continue; + tmp_bus = pci_do_find_bus(bus, busnr); + if (tmp_bus) + return tmp_bus; + } + return NULL; +} + +/** + * pci_find_next_bus - begin or continue searching for a PCI bus + * @from: Previous PCI bus found, or %NULL for new search. + * + * Iterates through the list of known PCI busses. A new search is + * initiated by passing %NULL to the @from argument. Otherwise if + * @from is not %NULL, searches continue from next device on the + * global list. + */ +struct pci_bus * +pci_find_next_bus(const struct pci_bus *from) +{ + struct list_head *n; + struct pci_bus *b = NULL; + + WARN_ON(in_interrupt()); + spin_lock(&pci_bus_lock); + n = from ? from->node.next : pci_root_buses.next; + if (n != &pci_root_buses) + b = pci_bus_b(n); + spin_unlock(&pci_bus_lock); + return b; +} + +/** + * pci_find_slot - locate PCI device from a given PCI slot + * @bus: number of PCI bus on which desired PCI device resides + * @devfn: encodes number of PCI slot in which the desired PCI + * device resides and the logical device number within that slot + * in case of multi-function devices. + * + * Given a PCI bus and slot/function number, the desired PCI device + * is located in system global list of PCI devices. If the device + * is found, a pointer to its data structure is returned. If no + * device is found, %NULL is returned. + */ +struct pci_dev * +pci_find_slot(unsigned int bus, unsigned int devfn) +{ + struct pci_dev *dev = NULL; + + while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { + if (dev->bus->number == bus && dev->devfn == devfn) + return dev; + } + return NULL; +} + +/** + * pci_get_slot - locate PCI device for a given PCI slot + * @bus: PCI bus on which desired PCI device resides + * @devfn: encodes number of PCI slot in which the desired PCI + * device resides and the logical device number within that slot + * in case of multi-function devices. + * + * Given a PCI bus and slot/function number, the desired PCI device + * is located in the list of PCI devices. + * If the device is found, its reference count is increased and this + * function returns a pointer to its data structure. The caller must + * decrement the reference count by calling pci_dev_put(). + * If no device is found, %NULL is returned. + */ +struct pci_dev * pci_get_slot(struct pci_bus *bus, unsigned int devfn) +{ + struct list_head *tmp; + struct pci_dev *dev; + + WARN_ON(in_interrupt()); + spin_lock(&pci_bus_lock); + + list_for_each(tmp, &bus->devices) { + dev = pci_dev_b(tmp); + if (dev->devfn == devfn) + goto out; + } + + dev = NULL; + out: + pci_dev_get(dev); + spin_unlock(&pci_bus_lock); + return dev; +} + +/** + * pci_find_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevice 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 + * @ss_vendor: PCI subsystem vendor id to match, or %PCI_ANY_ID to match all vendor ids + * @ss_device: PCI subsystem 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. If a PCI device is + * found with a matching @vendor, @device, @ss_vendor and @ss_device, a pointer to its + * device structure is returned. Otherwise, %NULL is returned. + * A new search is initiated by passing %NULL to the @from argument. + * Otherwise if @from is not %NULL, searches continue from next device on the global list. + * + * NOTE: Do not use this function anymore, use pci_get_subsys() instead, as + * the pci device returned by this function can disappear at any moment in + * time. + */ +static struct pci_dev * pci_find_subsys(unsigned int vendor, + unsigned int device, + unsigned int ss_vendor, + unsigned int ss_device, + const struct pci_dev *from) +{ + struct list_head *n; + struct pci_dev *dev; + + WARN_ON(in_interrupt()); + spin_lock(&pci_bus_lock); + n = from ? from->global_list.next : pci_devices.next; + + 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) && + (ss_vendor == PCI_ANY_ID || dev->subsystem_vendor == ss_vendor) && + (ss_device == PCI_ANY_ID || dev->subsystem_device == ss_device)) + goto exit; + n = n->next; + } + dev = NULL; +exit: + spin_unlock(&pci_bus_lock); + return dev; +} + +/** + * pci_find_device - 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. If a PCI device is + * found with a matching @vendor and @device, a pointer to its device structure is + * returned. Otherwise, %NULL is returned. + * A new search is initiated by passing %NULL to the @from argument. + * Otherwise if @from is not %NULL, searches continue from next device on the global list. + * + * NOTE: Do not use this function anymore, use pci_get_device() instead, as + * the pci device returned by this function can disappear at any moment in + * time. + */ +struct pci_dev * +pci_find_device(unsigned int vendor, unsigned int device, const struct pci_dev *from) +{ + return pci_find_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from); +} + +/** + * pci_get_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevice 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 + * @ss_vendor: PCI subsystem vendor id to match, or %PCI_ANY_ID to match all vendor ids + * @ss_device: PCI subsystem 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. If a PCI device is + * found with a matching @vendor, @device, @ss_vendor and @ss_device, a pointer to its + * device structure is returned, and the reference count to the device is + * incremented. Otherwise, %NULL is returned. A new search is initiated by + * passing %NULL to 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_subsys(unsigned int vendor, unsigned int device, + unsigned int ss_vendor, unsigned int ss_device, + struct pci_dev *from) +{ + struct list_head *n; + struct pci_dev *dev; + + WARN_ON(in_interrupt()); + spin_lock(&pci_bus_lock); + n = from ? from->global_list.next : pci_devices.next; + + 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) && + (ss_vendor == PCI_ANY_ID || dev->subsystem_vendor == ss_vendor) && + (ss_device == PCI_ANY_ID || dev->subsystem_device == ss_device)) + goto exit; + n = n->next; + } + dev = NULL; +exit: + pci_dev_put(from); + dev = pci_dev_get(dev); + spin_unlock(&pci_bus_lock); + return dev; +} + +/** + * pci_get_device - 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. 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 + * to 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(unsigned int vendor, unsigned int device, struct pci_dev *from) +{ + return pci_get_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from); +} + + +/** + * pci_find_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_find_device(). + * If a PCI device is found with a matching @vendor and @device, a pointer to + * its device structure is returned. Otherwise, %NULL is returned. + * A new search is initiated by passing %NULL to the @from argument. + * Otherwise if @from is not %NULL, searches continue from previous device on the global list. + */ +struct pci_dev * +pci_find_device_reverse(unsigned int vendor, unsigned int device, const struct pci_dev *from) +{ + struct list_head *n; + struct pci_dev *dev; + + WARN_ON(in_interrupt()); + spin_lock(&pci_bus_lock); + 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: + spin_unlock(&pci_bus_lock); + return dev; +} + +/** + * 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. + * A new search is initiated by passing %NULL to 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_class(unsigned int class, struct pci_dev *from) +{ + struct list_head *n; + struct pci_dev *dev; + + WARN_ON(in_interrupt()); + spin_lock(&pci_bus_lock); + 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: + pci_dev_put(from); + dev = pci_dev_get(dev); + spin_unlock(&pci_bus_lock); + return dev; +} + +/** + * 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) +{ + struct pci_dev *dev; + int found = 0; + + WARN_ON(in_interrupt()); + spin_lock(&pci_bus_lock); + while (ids->vendor || ids->subvendor || ids->class_mask) { + list_for_each_entry(dev, &pci_devices, global_list) { + if (pci_match_one_device(ids, dev)) { + found = 1; + goto exit; + } + } + ids++; + } +exit: + spin_unlock(&pci_bus_lock); + return found; +} +EXPORT_SYMBOL(pci_dev_present); + +EXPORT_SYMBOL(pci_find_bus); +EXPORT_SYMBOL(pci_find_device); +EXPORT_SYMBOL(pci_find_device_reverse); +EXPORT_SYMBOL(pci_find_slot); +EXPORT_SYMBOL(pci_get_device); +EXPORT_SYMBOL(pci_get_subsys); +EXPORT_SYMBOL(pci_get_slot); +EXPORT_SYMBOL(pci_get_class); |