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Linux/tools/power/cpupower/utils/helpers/pci.c

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  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__) */
 63 

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