DECLARE_RWSEM(pci_bus_sem);
EXPORT_SYMBOL_GPL(pci_bus_sem);
+/*
+ * pci_for_each_dma_alias - Iterate over DMA aliases for a device
+ * @pdev: starting downstream device
+ * @fn: function to call for each alias
+ * @data: opaque data to pass to @fn
+ *
+ * Starting @pdev, walk up the bus calling @fn for each possible alias
+ * of @pdev at the root bus.
+ */
+int pci_for_each_dma_alias(struct pci_dev *pdev,
+ int (*fn)(struct pci_dev *pdev,
+ u16 alias, void *data), void *data)
+{
+ struct pci_bus *bus;
+ int ret;
+
+ ret = fn(pdev, PCI_DEVID(pdev->bus->number, pdev->devfn), data);
+ if (ret)
+ return ret;
+
+ /*
+ * If the device is broken and uses an alias requester ID for
+ * DMA, iterate over that too.
+ */
+ if (unlikely(pdev->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVFN)) {
+ ret = fn(pdev, PCI_DEVID(pdev->bus->number,
+ pdev->dma_alias_devfn), data);
+ if (ret)
+ return ret;
+ }
+
+ for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) {
+ struct pci_dev *tmp;
+
+ /* Skip virtual buses */
+ if (!bus->self)
+ continue;
+
+ tmp = bus->self;
+
+ /*
+ * PCIe-to-PCI/X bridges alias transactions from downstream
+ * devices using the subordinate bus number (PCI Express to
+ * PCI/PCI-X Bridge Spec, rev 1.0, sec 2.3). For all cases
+ * where the upstream bus is PCI/X we alias to the bridge
+ * (there are various conditions in the previous reference
+ * where the bridge may take ownership of transactions, even
+ * when the secondary interface is PCI-X).
+ */
+ if (pci_is_pcie(tmp)) {
+ switch (pci_pcie_type(tmp)) {
+ case PCI_EXP_TYPE_ROOT_PORT:
+ case PCI_EXP_TYPE_UPSTREAM:
+ case PCI_EXP_TYPE_DOWNSTREAM:
+ continue;
+ case PCI_EXP_TYPE_PCI_BRIDGE:
+ ret = fn(tmp,
+ PCI_DEVID(tmp->subordinate->number,
+ PCI_DEVFN(0, 0)), data);
+ if (ret)
+ return ret;
+ continue;
+ case PCI_EXP_TYPE_PCIE_BRIDGE:
+ ret = fn(tmp,
+ PCI_DEVID(tmp->bus->number,
+ tmp->devfn), data);
+ if (ret)
+ return ret;
+ continue;
+ }
+ } else {
+ if (tmp->dev_flags & PCI_DEV_FLAG_PCIE_BRIDGE_ALIAS)
+ ret = fn(tmp,
+ PCI_DEVID(tmp->subordinate->number,
+ PCI_DEVFN(0, 0)), data);
+ else
+ ret = fn(tmp,
+ PCI_DEVID(tmp->bus->number,
+ tmp->devfn), data);
+ if (ret)
+ return ret;
+ }
+ }
+
+ return ret;
+}
+
/*
* find the upstream PCIe-to-PCI bridge of a PCI device
* if the device is PCIE, return NULL
* 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 *pci_find_upstream_pcie_bridge(struct pci_dev *pdev)
{
struct pci_dev *tmp = NULL;
struct pci_bus *child;
struct pci_bus *tmp;
- if(bus->number == busnr)
+ if (bus->number == busnr)
return bus;
list_for_each_entry(tmp, &bus->children, node) {
child = pci_do_find_bus(tmp, busnr);
- if(child)
+ if (child)
return child;
}
return NULL;
* 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 * pci_find_bus(int domain, int busnr)
+struct pci_bus *pci_find_bus(int domain, int busnr)
{
struct pci_bus *bus = NULL;
struct pci_bus *tmp_bus;
}
return NULL;
}
+EXPORT_SYMBOL(pci_find_bus);
/**
* pci_find_next_bus - begin or continue searching for a PCI bus
* @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 pci_bus *pci_find_next_bus(const struct pci_bus *from)
{
struct list_head *n;
struct pci_bus *b = NULL;
up_read(&pci_bus_sem);
return b;
}
+EXPORT_SYMBOL(pci_find_next_bus);
/**
* pci_get_slot - locate PCI device for a given PCI slot
up_read(&pci_bus_sem);
return dev;
}
+EXPORT_SYMBOL(pci_get_slot);
/**
* pci_get_domain_bus_and_slot - locate PCI device for a given PCI domain (segment), bus, and slot
return pci_get_dev_by_id(&id, from);
}
+EXPORT_SYMBOL(pci_get_subsys);
/**
* pci_get_device - begin or continue searching for a PCI device by vendor/device id
* 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)
+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);
}
+EXPORT_SYMBOL(pci_get_device);
/**
* pci_get_class - begin or continue searching for a PCI device by class
return pci_get_dev_by_id(&id, from);
}
+EXPORT_SYMBOL(pci_get_class);
/**
* pci_dev_present - Returns 1 if device matching the device list is present, 0 if not.
return 0;
}
EXPORT_SYMBOL(pci_dev_present);
-
-/* 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_subsys);
-EXPORT_SYMBOL(pci_get_slot);
-EXPORT_SYMBOL(pci_get_class);
projects / karo-tx-linux.git / blobdiff