diff options
Diffstat (limited to 'sys/dev/pci/pci.c')
| -rw-r--r-- | sys/dev/pci/pci.c | 48 |
1 files changed, 47 insertions, 1 deletions
diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c index 8bc9c1d..2c86832 100644 --- a/sys/dev/pci/pci.c +++ b/sys/dev/pci/pci.c @@ -23,7 +23,7 @@ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * - * $Id: pci.c,v 1.106 1999/05/30 16:53:36 phk Exp $ + * $Id: pci.c,v 1.107 1999/05/31 11:29:01 phk Exp $ * */ @@ -555,6 +555,52 @@ pci_conf_match(struct pci_match_conf *matches, int num_matches, return(1); } +/* + * Locate the parent of a PCI device by scanning the PCI devlist + * and return the entry for the parent. + * For devices on PCI Bus 0 (the host bus), this is the PCI Host. + * For devices on secondary PCI busses, this is that bus' PCI-PCI Bridge. + */ + +pcicfgregs * +pci_devlist_get_parent(pcicfgregs *cfg) +{ + struct devlist *devlist_head; + struct pci_devinfo *dinfo; + pcicfgregs *bridge_cfg; + int i; + + dinfo = STAILQ_FIRST(devlist_head = &pci_devq); + + /* If the device is on PCI bus 0, look for the host */ + if (cfg->bus == 0) { + for (i = 0; (dinfo != NULL) && (i < pci_numdevs); + dinfo = STAILQ_NEXT(dinfo, pci_links), i++) { + bridge_cfg = &dinfo->cfg; + if (bridge_cfg->baseclass == PCIC_BRIDGE + && bridge_cfg->subclass == PCIS_BRIDGE_HOST + && bridge_cfg->bus == cfg->bus) { + return bridge_cfg; + } + } + } + + /* If the device is not on PCI bus 0, look for the PCI-PCI bridge */ + if (cfg->bus > 0) { + for (i = 0; (dinfo != NULL) && (i < pci_numdevs); + dinfo = STAILQ_NEXT(dinfo, pci_links), i++) { + bridge_cfg = &dinfo->cfg; + if (bridge_cfg->baseclass == PCIC_BRIDGE + && bridge_cfg->subclass == PCIS_BRIDGE_PCI + && bridge_cfg->secondarybus == cfg->bus) { + return bridge_cfg; + } + } + } + + return NULL; +} + static int pci_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) { |
