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Diffstat (limited to '')
| -rw-r--r-- | tools/power/cpupower/utils/helpers/pci.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/tools/power/cpupower/utils/helpers/pci.c b/tools/power/cpupower/utils/helpers/pci.c new file mode 100644 index 000000000..113f3da2a --- /dev/null +++ b/tools/power/cpupower/utils/helpers/pci.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0 +#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; + struct pci_dev *device; + + *pacc = pci_alloc(); + if (*pacc == NULL) + return NULL; + + pci_filter_init(*pacc, &filter_nb_link); + filter_nb_link.domain = domain; + filter_nb_link.bus = bus; + filter_nb_link.slot = slot; + filter_nb_link.func = func; + filter_nb_link.vendor = vendor; + filter_nb_link.device = dev; + + 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__) */ |