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