#include "pci.h"
DECLARE_RWSEM(pci_bus_sem);
+/*
+ * find the upstream PCIE-to-PCI bridge of a PCI device
+ * if the device is PCIE, return NULL
+ * if the device isn't connected to a PCIE bridge (that is its parent is a
+ * legacy PCI bridge and the bridge is directly connected to bus 0), return its
+ * parent
+ */
+struct pci_dev *
+pci_find_upstream_pcie_bridge(struct pci_dev *pdev)
+{
+ struct pci_dev *tmp = NULL;
+
+ if (pdev->is_pcie)
+ return NULL;
+ while (1) {
+ if (!pdev->bus->parent)
+ break;
+ pdev = pdev->bus->self;
+ /* a p2p bridge */
+ if (!pdev->is_pcie) {
+ tmp = pdev;
+ continue;
+ }
+ /* PCI device should connect to a PCIE bridge */
+ if (pdev->pcie_type != PCI_EXP_TYPE_PCI_BRIDGE) {
+ /* Busted hardware? */
+ WARN_ON_ONCE(1);
+ return NULL;
+ }
+ return pdev;
+ }
+
+ return tmp;
+}
-static struct pci_bus * __devinit
-pci_do_find_bus(struct pci_bus* bus, unsigned char busnr)
+static struct pci_bus *pci_do_find_bus(struct pci_bus *bus, unsigned char busnr)
{
struct pci_bus* child;
struct list_head *tmp;
return b;
}
+#ifdef CONFIG_PCI_LEGACY
/**
* 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
+ * @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
+ * 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
+ * is found, a pointer to its data structure is returned. If no
* device is found, %NULL is returned.
+ *
+ * NOTE: Do not use this function any more; use pci_get_slot() instead, as
+ * the PCI device returned by this function can disappear at any moment in
+ * time.
*/
-struct pci_dev *
-pci_find_slot(unsigned int bus, unsigned int devfn)
+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)
+ while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
+ if (dev->bus->number == bus && dev->devfn == devfn) {
+ pci_dev_put(dev);
return dev;
+ }
}
return NULL;
}
+EXPORT_SYMBOL(pci_find_slot);
+
+/**
+ * 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 as the @from argument.
+ * Otherwise if @from is not %NULL, searches continue from next device
+ * on the global list.
+ *
+ * NOTE: Do not use this function any more; 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,
+ struct pci_dev *from)
+{
+ struct pci_dev *pdev;
+
+ pci_dev_get(from);
+ pdev = pci_get_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from);
+ pci_dev_put(pdev);
+ return pdev;
+}
+EXPORT_SYMBOL(pci_find_device);
+#endif /* CONFIG_PCI_LEGACY */
/**
* pci_get_slot - locate PCI device for a given PCI slot
}
/**
- * pci_get_bus_and_slot - locate PCI device from a given PCI slot
+ * pci_get_bus_and_slot - locate PCI device from a given PCI bus & 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.
*
+ * Note: the bus/slot search is limited to PCI domain (segment) 0.
+ *
* 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
struct pci_dev *dev = NULL;
while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
- if (dev->bus->number == bus && dev->devfn == devfn)
+ if (pci_domain_nr(dev->bus) == 0 &&
+ (dev->bus->number == bus && dev->devfn == devfn))
return dev;
}
return NULL;
}
-/**
- * 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 as the @from argument.
- * Otherwise if @from is not %NULL, searches continue from next device
- * on the global list.
- *
- * NOTE: Do not use this function any more; 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)
+static int match_pci_dev_by_id(struct device *dev, void *data)
{
- struct list_head *n;
- struct pci_dev *dev;
-
- WARN_ON(in_interrupt());
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct pci_device_id *id = data;
- /*
- * pci_find_subsys() can be called on the ide_setup() path, super-early
- * in boot. But the down_read() will enable local interrupts, which
- * can cause some machines to crash. So here we detect and flag that
- * situation and bail out early.
- */
- if (unlikely(list_empty(&pci_devices)))
- return NULL;
- down_read(&pci_bus_sem);
- 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:
- up_read(&pci_bus_sem);
- return dev;
+ if (pci_match_one_device(id, pdev))
+ return 1;
+ return 0;
}
-/**
- * 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
+/*
+ * pci_get_dev_by_id - begin or continue searching for a PCI device by id
+ * @id: pointer to struct pci_device_id to match for the device
* @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 as the @from argument.
- * Otherwise if @from is not %NULL, searches continue from next device
- * on the global list.
- *
- * NOTE: Do not use this function any more; use pci_get_device() instead, as
- * the PCI device returned by this function can disappear at any moment in
- * time.
+ * with a matching id 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 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.
+ *
+ * This is an internal function for use by the other search functions in
+ * this file.
*/
-struct pci_dev *
-pci_find_device(unsigned int vendor, unsigned int device, const struct pci_dev *from)
+static struct pci_dev *pci_get_dev_by_id(const struct pci_device_id *id,
+ struct pci_dev *from)
{
- return pci_find_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from);
+ struct device *dev;
+ struct device *dev_start = NULL;
+ struct pci_dev *pdev = NULL;
+
+ WARN_ON(in_interrupt());
+ if (from)
+ dev_start = &from->dev;
+ dev = bus_find_device(&pci_bus_type, dev_start, (void *)id,
+ match_pci_dev_by_id);
+ if (dev)
+ pdev = to_pci_dev(dev);
+ if (from)
+ pci_dev_put(from);
+ return pdev;
}
/**
* 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 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());
+ struct pci_dev *pdev;
+ struct pci_device_id *id;
/*
- * pci_get_subsys() can potentially be called by drivers super-early
- * in boot. But the down_read() will enable local interrupts, which
- * can cause some machines to crash. So here we detect and flag that
- * situation and bail out early.
+ * pci_find_subsys() can be called on the ide_setup() path,
+ * super-early in boot. But the down_read() will enable local
+ * interrupts, which can cause some machines to crash. So here we
+ * detect and flag that situation and bail out early.
*/
- if (unlikely(list_empty(&pci_devices)))
+ if (unlikely(no_pci_devices()))
return NULL;
- down_read(&pci_bus_sem);
- 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:
- dev = pci_dev_get(dev);
- up_read(&pci_bus_sem);
- pci_dev_put(from);
- return dev;
+
+ id = kzalloc(sizeof(*id), GFP_KERNEL);
+ if (!id)
+ return NULL;
+ id->vendor = vendor;
+ id->device = device;
+ id->subvendor = ss_vendor;
+ id->subdevice = ss_device;
+
+ pdev = pci_get_dev_by_id(id, from);
+ kfree(id);
+
+ return pdev;
}
/**
}
/**
- * 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;
-}
-
-/**
- * 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 as 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());
- 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:
- up_read(&pci_bus_sem);
- 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.
*/
struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from)
{
- struct list_head *n;
struct pci_dev *dev;
+ struct pci_device_id *id;
- WARN_ON(in_interrupt());
- down_read(&pci_bus_sem);
- n = from ? from->global_list.next : pci_devices.next;
+ id = kzalloc(sizeof(*id), GFP_KERNEL);
+ if (!id)
+ return NULL;
+ id->vendor = id->device = id->subvendor = id->subdevice = PCI_ANY_ID;
+ id->class_mask = PCI_ANY_ID;
+ id->class = class;
- 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);
- up_read(&pci_bus_sem);
- pci_dev_put(from);
+ dev = pci_get_dev_by_id(id, from);
+ kfree(id);
return dev;
}
-const struct pci_device_id *pci_find_present(const struct pci_device_id *ids)
-{
- struct pci_dev *dev;
- const struct pci_device_id *found = NULL;
-
- 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)
- break;
- }
- ids++;
- }
- up_read(&pci_bus_sem);
- return found;
-}
-
/**
* 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
*/
int pci_dev_present(const struct pci_device_id *ids)
{
- return pci_find_present(ids) == NULL ? 0 : 1;
-}
+ struct pci_dev *found = NULL;
+ WARN_ON(in_interrupt());
+ while (ids->vendor || ids->subvendor || ids->class_mask) {
+ found = pci_get_dev_by_id(ids, NULL);
+ if (found)
+ goto exit;
+ ids++;
+ }
+exit:
+ if (found)
+ return 1;
+ return 0;
+}
EXPORT_SYMBOL(pci_dev_present);
-EXPORT_SYMBOL(pci_find_present);
-EXPORT_SYMBOL(pci_find_device);
-EXPORT_SYMBOL(pci_find_device_reverse);
-EXPORT_SYMBOL(pci_find_slot);
/* For boot time work */
EXPORT_SYMBOL(pci_find_bus);
EXPORT_SYMBOL(pci_find_next_bus);
/* For everyone */
EXPORT_SYMBOL(pci_get_device);
-EXPORT_SYMBOL(pci_get_device_reverse);
EXPORT_SYMBOL(pci_get_subsys);
EXPORT_SYMBOL(pci_get_slot);
EXPORT_SYMBOL(pci_get_bus_and_slot);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff