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  */
  25 struct 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;
  29         struct pci_dev *device;
  30
  31         *pacc = pci_alloc();
  32         if (*pacc == NULL)
  33                 return NULL;
  34
  35         pci_filter_init(*pacc, &filter_nb_link);
  36         filter_nb_link.domain   = domain;
  37         filter_nb_link.bus      = bus;
  38         filter_nb_link.slot     = slot;
  39         filter_nb_link.func     = func;
  40         filter_nb_link.vendor   = vendor;
  41         filter_nb_link.device   = dev;
  42
  43         pci_init(*pacc);
  44         pci_scan_bus(*pacc);
  45
  46         for (device = (*pacc)->devices; device; device = device->next) {
  47                 if (pci_filter_match(&filter_nb_link, device))
  48                         return device;
  49         }
  50         pci_cleanup(*pacc);
  51         return NULL;
  52 }
  53
  54 /* Typically one wants to get a specific slot(device)/func of the root domain
  55    and bus */
  56 struct pci_dev *pci_slot_func_init(struct pci_access **pacc, int slot,
  57                                        int func)
  58 {
  59         return pci_acc_init(pacc, 0, 0, slot, func, -1, -1);
  60 }
  61
  62 #endif /* defined(__i386__) || defined(__x86_64__) */