LXR linux/tools/power/cpupower/utils/helpers/pci.c

   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 */
  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 domain
  56   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