1 // SPDX-License-Identifier: GPL-2.0
3  * PCI searching functions
5  * Copyright (C) 1993 -- 1997 Drew Eckhardt, Frederic Potter,
6  *					David Mosberger-Tang
7  * Copyright (C) 1997 -- 2000 Martin Mares <mj@ucw.cz>
8  * Copyright (C) 2003 -- 2004 Greg Kroah-Hartman <greg@kroah.com>
11 #include <linux/pci.h>
15 #include "pci.h"
20  * pci_for_each_dma_alias - Iterate over DMA aliases for a device
37 	 * requester is on another PCI bus.  in pci_for_each_dma_alias()
49 	if (unlikely(pdev->dma_alias_mask)) {  in pci_for_each_dma_alias()
52 		for_each_set_bit(devfn, pdev->dma_alias_mask, MAX_NR_DEVFNS) {  in pci_for_each_dma_alias()
53 			ret = fn(pdev, PCI_DEVID(pdev->bus->number, devfn),  in pci_for_each_dma_alias()
60 	for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) {  in pci_for_each_dma_alias()
64 		if (!bus->self)  in pci_for_each_dma_alias()
67 		tmp = bus->self;  in pci_for_each_dma_alias()
70 		if (tmp->dev_flags & PCI_DEV_FLAGS_BRIDGE_XLATE_ROOT)  in pci_for_each_dma_alias()
74 		 * PCIe-to-PCI/X bridges alias transactions from downstream  in pci_for_each_dma_alias()
75 		 * devices using the subordinate bus number (PCI Express to  in pci_for_each_dma_alias()
76 		 * PCI/PCI-X Bridge Spec, rev 1.0, sec 2.3).  For all cases  in pci_for_each_dma_alias()
77 		 * where the upstream bus is PCI/X we alias to the bridge  in pci_for_each_dma_alias()
80 		 * when the secondary interface is PCI-X).  in pci_for_each_dma_alias()
90 					 PCI_DEVID(tmp->subordinate->number,  in pci_for_each_dma_alias()
102 			if (tmp->dev_flags & PCI_DEV_FLAG_PCIE_BRIDGE_ALIAS)  in pci_for_each_dma_alias()
104 					 PCI_DEVID(tmp->subordinate->number,  in pci_for_each_dma_alias()
121 	if (bus->number == busnr)  in pci_do_find_bus()
124 	list_for_each_entry(tmp, &bus->children, node) {  in pci_do_find_bus()
133  * pci_find_bus - locate PCI bus from a given domain and bus number
134  * @domain: number of PCI domain to search
135  * @busnr: number of desired PCI bus
137  * Given a PCI bus number and domain number, the desired PCI bus is located
138  * in the global list of PCI buses.  If the bus is found, a pointer to its
141 struct pci_bus *pci_find_bus(int domain, int busnr)  in pci_find_bus()  argument
147 		if (pci_domain_nr(bus) != domain)  in pci_find_bus()
158  * pci_find_next_bus - begin or continue searching for a PCI bus
159  * @from: Previous PCI bus found, or %NULL for new search.
161  * Iterates through the list of known PCI buses.  A new search is
172 	n = from ? from->node.next : pci_root_buses.next;  in pci_find_next_bus()
181  * pci_get_slot - locate PCI device for a given PCI slot
182  * @bus: PCI bus on which desired PCI device resides
183  * @devfn: encodes number of PCI slot in which the desired PCI
185  * in case of multi-function devices.
187  * Given a PCI bus and slot/function number, the desired PCI device
188  * is located in the list of PCI devices.
200 	list_for_each_entry(dev, &bus->devices, bus_list) {  in pci_get_slot()
201 		if (dev->devfn == devfn)  in pci_get_slot()
214  * pci_get_domain_bus_and_slot - locate PCI device for a given PCI domain (segment), bus, and slot
215  * @domain: PCI domain/segment on which the PCI device resides.
216  * @bus: PCI bus on which desired PCI device resides
217  * @devfn: encodes number of PCI slot in which the desired PCI device
219  * multi-function devices.
221  * Given a PCI domain, bus, and slot/function number, the desired PCI
222  * device is located in the list of PCI devices. If the device is
228 struct pci_dev *pci_get_domain_bus_and_slot(int domain, unsigned int bus,  in pci_get_domain_bus_and_slot()  argument
234 		if (pci_domain_nr(dev->bus) == domain &&  in pci_get_domain_bus_and_slot()
235 		    (dev->bus->number == bus && dev->devfn == devfn))  in pci_get_domain_bus_and_slot()
253  * pci_get_dev_by_id - begin or continue searching for a PCI device by id
255  * @from: Previous PCI device found in search, or %NULL for new search.
257  * Iterates through the list of known PCI devices.  If a PCI device is found
276 		dev_start = &from->dev;  in pci_get_dev_by_id()
286 …* pci_get_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevi…
287  * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids
288  * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids
289  * @ss_vendor: PCI subsystem vendor id to match, or %PCI_ANY_ID to match all vendor ids
290  * @ss_device: PCI subsystem device id to match, or %PCI_ANY_ID to match all device ids
291  * @from: Previous PCI device found in search, or %NULL for new search.
293  * Iterates through the list of known PCI devices.  If a PCI device is found
317  * pci_get_device - begin or continue searching for a PCI device by vendor/device id
318  * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids
319  * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids
320  * @from: Previous PCI device found in search, or %NULL for new search.
322  * Iterates through the list of known PCI devices.  If a PCI device is
338  * pci_get_class - begin or continue searching for a PCI device by class
339  * @class: search for a PCI device with this class designation
340  * @from: Previous PCI device found in search, or %NULL for new search.
342  * Iterates through the list of known PCI devices.  If a PCI device is
367  * pci_get_base_class - searching for a PCI device by matching against the base class code only
368  * @class: search for a PCI device with this base class code
369  * @from: Previous PCI device found in search, or %NULL for new search.
371  * Iterates through the list of known PCI devices. If a PCI device is found
380  * A pointer to a matched PCI device, %NULL Otherwise.
398  * pci_dev_present - Returns 1 if device matching the device list is present, 0 if not.
400  * that describe the type of PCI device the caller is trying to find.
412 	while (ids->vendor || ids->subvendor || ids->class_mask) {  in pci_dev_present()