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63 lines
1.6 KiB
63 lines
1.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#if defined(__i386__) || defined(__x86_64__) |
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#include <helpers/helpers.h> |
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/* |
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* pci_acc_init |
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* |
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* PCI access helper function depending on libpci |
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* |
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* **pacc : if a valid pci_dev is returned |
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* *pacc must be passed to pci_acc_cleanup to free it |
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* |
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* domain: domain |
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* bus: bus |
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* slot: slot |
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* func: func |
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* vendor: vendor |
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* device: device |
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* Pass -1 for one of the six above to match any |
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* |
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* Returns : |
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* struct pci_dev which can be used with pci_{read,write}_* functions |
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* to access the PCI config space of matching pci devices |
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*/ |
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struct pci_dev *pci_acc_init(struct pci_access **pacc, int domain, int bus, |
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int slot, int func, int vendor, int dev) |
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{ |
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struct pci_filter filter_nb_link; |
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struct pci_dev *device; |
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*pacc = pci_alloc(); |
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if (*pacc == NULL) |
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return NULL; |
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pci_filter_init(*pacc, &filter_nb_link); |
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filter_nb_link.domain = domain; |
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filter_nb_link.bus = bus; |
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filter_nb_link.slot = slot; |
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filter_nb_link.func = func; |
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filter_nb_link.vendor = vendor; |
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filter_nb_link.device = dev; |
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pci_init(*pacc); |
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pci_scan_bus(*pacc); |
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for (device = (*pacc)->devices; device; device = device->next) { |
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if (pci_filter_match(&filter_nb_link, device)) |
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return device; |
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} |
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pci_cleanup(*pacc); |
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return NULL; |
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} |
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/* Typically one wants to get a specific slot(device)/func of the root domain |
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and bus */ |
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struct pci_dev *pci_slot_func_init(struct pci_access **pacc, int slot, |
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int func) |
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{ |
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return pci_acc_init(pacc, 0, 0, slot, func, -1, -1); |
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} |
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#endif /* defined(__i386__) || defined(__x86_64__) */
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