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

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  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  */
 26 struct 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 */
 57 struct 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 

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