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cpupower: Better interface for accessing AMD pci registers

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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>
This commit is contained in:
Thomas Renninger
2011-10-11 15:33:50 +02:00
committed by Dominik Brodowski
parent 6b21d18ed5
commit 568a89904c
4 changed files with 32 additions and 23 deletions
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35
tools/power/cpupower/utils/helpers/pci.c
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@@ -10,19 +10,24 @@
* **pacc : if a valid pci_dev is returned
* *pacc must be passed to pci_acc_cleanup to free it
*
* vendor_id : the pci vendor id matching the pci device to access
* dev_ids : device ids matching the pci device to access
* 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 vendor_id,
int *dev_ids)
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 = { -1, -1, -1, -1, vendor_id, 0};
struct pci_filter filter_nb_link = { domain, bus, slot, func,
vendor, dev };
struct pci_dev *device;
unsigned int i;
*pacc = pci_alloc();
if (*pacc == NULL)
@@ -31,14 +36,20 @@ struct pci_dev *pci_acc_init(struct pci_access **pacc, int vendor_id,
pci_init(*pacc);
pci_scan_bus(*pacc);
for (i = 0; dev_ids[i] != 0; i++) {
filter_nb_link.device = dev_ids[i];
for (device = (*pacc)->devices; device; device = device->next) {
if (pci_filter_match(&filter_nb_link, device))
return device;
}
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__) */