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

   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 */
  25struct 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 = { domain, bus, slot, func,
  29                                             vendor, dev };
  30        struct pci_dev *device;
  31
  32        *pacc = pci_alloc();
  33        if (*pacc == NULL)
  34                return NULL;
  35
  36        pci_init(*pacc);
  37        pci_scan_bus(*pacc);
  38
  39        for (device = (*pacc)->devices; device; device = device->next) {
  40                if (pci_filter_match(&filter_nb_link, device))
  41                        return device;
  42        }
  43        pci_cleanup(*pacc);
  44        return NULL;
  45}
  46
  47/* Typically one wants to get a specific slot(device)/func of the root domain
  48   and bus */
  49struct pci_dev *pci_slot_func_init(struct pci_access **pacc, int slot,
  50                                       int func)
  51{
  52        return pci_acc_init(pacc, 0, 0, slot, func, -1, -1);
  53}
  54
  55#endif /* defined(__i386__) || defined(__x86_64__) */
  56