1 // SPDX-License-Identifier: GPL-2.0
2 #if defined(__i386__) || defined(__x86_64__)
3
4 #include <helpers/helpers.h>
5
6 /*
7 * pci_acc_init
8 *
9 * PCI access helper function depending on libpci
10 *
11 * **pacc : if a valid pci_dev is returned
12 * *pacc must be passed to pci_acc_cleanup to free it
13 *
14 * domain: domain
15 * bus: bus
16 * slot: slot
17 * func: func
18 * vendor: vendor
19 * device: device
20 * Pass -1 for one of the six above to match any
21 *
22 * Returns :
23 * struct pci_dev which can be used with pci_{read,write}_* functions
24 * to access the PCI config space of matching pci devices
25 */
26 struct pci_dev *pci_acc_init(struct pci_access **pacc, int domain, int bus,
27 int slot, int func, int vendor, int dev)
28 {
29 struct pci_filter filter_nb_link;
30 struct pci_dev *device;
31
32 *pacc = pci_alloc();
33 if (*pacc == NULL)
34 return NULL;
35
36 pci_filter_init(*pacc, &filter_nb_link);
37 filter_nb_link.domain = domain;
38 filter_nb_link.bus = bus;
39 filter_nb_link.slot = slot;
40 filter_nb_link.func = func;
41 filter_nb_link.vendor = vendor;
42 filter_nb_link.device = dev;
43
44 pci_init(*pacc);
45 pci_scan_bus(*pacc);
46
47 for (device = (*pacc)->devices; device; device = device->next) {
48 if (pci_filter_match(&filter_nb_link, device))
49 return device;
50 }
51 pci_cleanup(*pacc);
52 return NULL;
53 }
54
55 /* Typically one wants to get a specific slot(device)/func of the root domain
56 and bus */
57 struct pci_dev *pci_slot_func_init(struct pci_access **pacc, int slot,
58 int func)
59 {
60 return pci_acc_init(pacc, 0, 0, slot, func, -1, -1);
61 }
62
63 #endif /* defined(__i386__) || defined(__x86_64__) */
64
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