pci.c

Go to the documentation of this file.

#if defined(__i386__) || defined(__x86_64__)

#include <helpers/helpers.h>

/*
 * pci_acc_init
 *
 * PCI access helper function depending on libpci
 *
 * **pacc : if a valid pci_dev is returned
 *         *pacc must be passed to pci_acc_cleanup to free it
 *
 * domain: domain
 * bus:    bus
 * slot:   slot
 * func:   func
 * vendor: vendor
 * device: device
 * Pass -1 for one of the six above to match any
 *
 * Returns :
 * struct pci_dev which can be used with pci_{read,write}_* functions
 *                to access the PCI config space of matching pci devices
 */
struct pci_dev *pci_acc_init(struct pci_access **pacc, int domain, int bus,
                 int slot, int func, int vendor, int dev)
{
    struct pci_filter filter_nb_link = { domain, bus, slot, func,
                         vendor, dev };
    struct pci_dev *device;

    *pacc = pci_alloc();
    if (*pacc == NULL)
        return NULL;

    pci_init(*pacc);
    pci_scan_bus(*pacc);

    for (device = (*pacc)->devices; device; device = device->next) {
        if (pci_filter_match(&filter_nb_link, device))
            return device;
    }
    pci_cleanup(*pacc);
    return NULL;
}

/* Typically one wants to get a specific slot(device)/func of the root domain
   and bus */
struct pci_dev *pci_slot_func_init(struct pci_access **pacc, int slot,
                       int func)
{
    return pci_acc_init(pacc, 0, 0, slot, func, -1, -1);
}

#endif /* defined(__i386__) || defined(__x86_64__) */