1 // SPDX-License-Identifier: GPL-2.0
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>
20  * pci_for_each_dma_alias - Iterate over DMA aliases for a device
21  * @pdev: starting downstream device
36 	 * The device may have an explicit alias requester ID for DMA where the  in pci_for_each_dma_alias()
46 	 * If the device is broken and uses an alias requester ID for  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()
76 		 * PCI/PCI-X Bridge Spec, rev 1.0, sec 2.3).  For all cases  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
158  * pci_find_next_bus - begin or continue searching for a PCI bus
163  * @from is not %NULL, searches continue from next device on the
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
184  * device resides and the logical device number within that slot
185  * in case of multi-function devices.
187  * Given a PCI bus and slot/function number, the desired PCI device
189  * If the device is found, its reference count is increased and this
192  * If no device is found, %NULL is returned.
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
218  * resides and the logical device number within that slot in case of
219  * multi-function devices.
222  * device is located in the list of PCI devices. If the device is
225  * reference count by calling pci_dev_put().  If no device is found,
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()
242 static int match_pci_dev_by_id(struct device *dev, const void *data)  in match_pci_dev_by_id()
245 	const struct pci_device_id *id = data;  in match_pci_dev_by_id()  local
247 	if (pci_match_one_device(id, pdev))  in match_pci_dev_by_id()
253  * pci_get_dev_by_id - begin or continue searching for a PCI device by id
254  * @id: pointer to struct pci_device_id to match for the device
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
258  * with a matching id a pointer to its device structure is returned, and the
259  * reference count to the device is incremented.  Otherwise, %NULL is returned.
261  * if @from is not %NULL, searches continue from next device on the global
268 static struct pci_dev *pci_get_dev_by_id(const struct pci_device_id *id,  in pci_get_dev_by_id()  argument
271 	struct device *dev;  in pci_get_dev_by_id()
272 	struct device *dev_start = NULL;  in pci_get_dev_by_id()
276 		dev_start = &from->dev;  in pci_get_dev_by_id()
277 	dev = bus_find_device(&pci_bus_type, dev_start, (void *)id,  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
294  * with a matching @vendor, @device, @ss_vendor and @ss_device, a pointer to its
295  * device structure is returned, and the reference count to the device is
298  * searches continue from next device on the global list.
301 struct pci_dev *pci_get_subsys(unsigned int vendor, unsigned int device,  in pci_get_subsys()  argument
305 	struct pci_device_id id = {  in pci_get_subsys()  local
307 		.device = device,  in pci_get_subsys()
312 	return pci_get_dev_by_id(&id, from);  in pci_get_subsys()
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
323  * found with a matching @vendor and @device, the reference count to the
324  * device is incremented and a pointer to its device structure is returned.
327  * from next device on the global list.  The reference count for @from is
330 struct pci_dev *pci_get_device(unsigned int vendor, unsigned int device,  in pci_get_device()  argument
333 	return pci_get_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from);  in pci_get_device()
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
343  * found with a matching @class, the reference count to the device is
344  * incremented and a pointer to its device structure is returned.
347  * Otherwise if @from is not %NULL, searches continue from next device
353 	struct pci_device_id id = {  in pci_get_class()  local
355 		.device = PCI_ANY_ID,  in pci_get_class()
362 	return pci_get_dev_by_id(&id, from);  in pci_get_class()
367  * pci_dev_present - Returns 1 if device matching the device list is present, 0 if not.
369  * that describe the type of PCI device the caller is trying to find.
371  * Obvious fact: You do not have a reference to any device that might be found
372  * by this function, so if that device is removed from the system right after
375  * to if another device happens to be present at this specific moment in time.
381 	while (ids->vendor || ids->subvendor || ids->class_mask) {  in pci_dev_present()