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1// SPDX-License-Identifier: GPL-2.02#if defined(__i386__) || defined(__x86_64__)3 4#include <helpers/helpers.h>5 6/*7 * pci_acc_init8 *9 * PCI access helper function depending on libpci10 *11 * **pacc : if a valid pci_dev is returned12 * *pacc must be passed to pci_acc_cleanup to free it13 *14 * domain: domain15 * bus: bus16 * slot: slot17 * func: func18 * vendor: vendor19 * device: device20 * Pass -1 for one of the six above to match any21 *22 * Returns :23 * struct pci_dev which can be used with pci_{read,write}_* functions24 * to access the PCI config space of matching pci devices25 */26struct 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 domain56 and bus */57struct 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