mirror of
https://gitee.com/openharmony/kernel_linux
synced 2025-05-21 14:16:41 +00:00
568a89904c
AMD's BKDG (Bios and Kernel Developers Guide) talks in the CPU spec of their CPU families about PCI registers defined by "device" (slot) and func(tion). Assuming that CPU specific configuration PCI devices are always on domain and bus zero a pci_slot_func_init() func which gets the slot and func of the desired PCI device passed looks like the most convenient way. This also obsoletes the PCI device id maintenance. Signed-off-by: Thomas Renninger <trenn@suse.de> CC: Andreas Herrmann <herrmann.der.user@googlemail.com> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
#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__) */
|