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1 #if defined(__i386__) || defined(__x86_64__)
2 
3 #include <helpers/helpers.h>
4 
5 /*
6  * pci_acc_init
7  *
8  * PCI access helper function depending on libpci
9  *
10  * **pacc : if a valid pci_dev is returned
11  *         *pacc must be passed to pci_acc_cleanup to free it
12  *
13  * domain: domain
14  * bus:    bus
15  * slot:   slot
16  * func:   func
17  * vendor: vendor
18  * device: device
19  * Pass -1 for one of the six above to match any
20  *
21  * Returns :
22  * struct pci_dev which can be used with pci_{read,write}_* functions
23  *                to access the PCI config space of matching pci devices
24  */
pci_acc_init(struct pci_access ** pacc,int domain,int bus,int slot,int func,int vendor,int dev)25 struct pci_dev *pci_acc_init(struct pci_access **pacc, int domain, int bus,
26 			     int slot, int func, int vendor, int dev)
27 {
28 	struct pci_filter filter_nb_link;
29 	struct pci_dev *device;
30 
31 	*pacc = pci_alloc();
32 	if (*pacc == NULL)
33 		return NULL;
34 
35 	pci_filter_init(*pacc, &filter_nb_link);
36 	filter_nb_link.domain	= domain;
37 	filter_nb_link.bus	= bus;
38 	filter_nb_link.slot	= slot;
39 	filter_nb_link.func	= func;
40 	filter_nb_link.vendor	= vendor;
41 	filter_nb_link.device	= dev;
42 
43 	pci_init(*pacc);
44 	pci_scan_bus(*pacc);
45 
46 	for (device = (*pacc)->devices; device; device = device->next) {
47 		if (pci_filter_match(&filter_nb_link, device))
48 			return device;
49 	}
50 	pci_cleanup(*pacc);
51 	return NULL;
52 }
53 
54 /* Typically one wants to get a specific slot(device)/func of the root domain
55    and bus */
pci_slot_func_init(struct pci_access ** pacc,int slot,int func)56 struct pci_dev *pci_slot_func_init(struct pci_access **pacc, int slot,
57 				       int func)
58 {
59 	return pci_acc_init(pacc, 0, 0, slot, func, -1, -1);
60 }
61 
62 #endif /* defined(__i386__) || defined(__x86_64__) */
63