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Add a new helper function for PCI devices to locate the upstream

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PCI-express root port of a given PCI device.

Reviewed by:	kib, imp
MFC after:	1 week
Sponsored by:	Chelsio
Differential Revision:	https://reviews.freebsd.org/D4089
This commit is contained in:
John Baldwin 2015-11-05 21:27:25 +00:00
parent ec603c7297
commit 87dd2f95d2
4 changed files with 56 additions and 0 deletions
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1
share/man/man9/Makefile
View File

@ -1274,6 +1274,7 @@ MLINKS+=pci.9 pci_alloc_msi.9 \
pci.9 pci_find_device.9 \
pci.9 pci_find_extcap.9 \
pci.9 pci_find_htcap.9 \
pci.9 pci_find_pcie_root_port.9 \
pci.9 pci_get_max_read_req.9 \
pci.9 pci_get_powerstate.9 \
pci.9 pci_get_vpd_ident.9 \

13
share/man/man9/pci.9
View File

@ -42,6 +42,7 @@
.Nm pci_find_device ,
.Nm pci_find_extcap ,
.Nm pci_find_htcap ,
.Nm pci_find_pcie_root_port ,
.Nm pci_get_max_read_req ,
.Nm pci_get_powerstate ,
.Nm pci_get_vpd_ident ,
@ -91,6 +92,8 @@
.Fn pci_find_extcap "device_t dev" "int capability" "int *capreg"
.Ft int
.Fn pci_find_htcap "device_t dev" "int capability" "int *capreg"
.Ft device_t
.Fn pci_find_pcie_root_port "device_t dev"
.Ft int
.Fn pci_get_max_read_req "device_t dev"
.Ft int
@ -338,6 +341,16 @@ If the capability is not found or the device is not a HyperTransport device,
returns an error.
.Pp
The
.Fn pci_find_pcie_root_port
function walks up the PCI device hierarchy to locate the PCI-express root
port upstream of
.Fa dev .
If a root port is not found,
.Fn pci_find_pcie_root_port
returns
.Dv NULL .
.Pp
The
.Fn pci_get_vpd_ident
function is used to fetch a device's Vital Product Data
.Pq VPD

41
sys/dev/pci/pci.c
View File

@ -5431,3 +5431,44 @@ pci_get_rid_method(device_t dev, device_t child)
return (PCIB_GET_RID(device_get_parent(dev), child));
}
/* Find the upstream port of a given PCI device in a root complex. */
device_t
pci_find_pcie_root_port(device_t dev)
{
struct pci_devinfo *dinfo;
devclass_t pci_class;
device_t pcib, bus;
pci_class = devclass_find("pci");
KASSERT(device_get_devclass(device_get_parent(dev)) == pci_class,
("%s: non-pci device %s", __func__, device_get_nameunit(dev)));
/*
* Walk the bridge hierarchy until we find a PCI-e root
* port or a non-PCI device.
*/
for (;;) {
bus = device_get_parent(dev);
KASSERT(bus != NULL, ("%s: null parent of %s", __func__,
device_get_nameunit(dev)));
pcib = device_get_parent(bus);
KASSERT(pcib != NULL, ("%s: null bridge of %s", __func__,
device_get_nameunit(bus)));
/*
* pcib's parent must be a PCI bus for this to be a
* PCI-PCI bridge.
*/
if (device_get_devclass(device_get_parent(pcib)) != pci_class)
return (NULL);
dinfo = device_get_ivars(pcib);
if (dinfo->cfg.pcie.pcie_location != 0 &&
dinfo->cfg.pcie.pcie_type == PCIEM_TYPE_ROOT_PORT)
return (pcib);
dev = pcib;
}
}

1
sys/dev/pci/pcivar.h
View File

@ -547,6 +547,7 @@ int pci_msix_device_blacklisted(device_t dev);
void pci_ht_map_msi(device_t dev, uint64_t addr);
device_t pci_find_pcie_root_port(device_t dev);
int pci_get_max_read_req(device_t dev);
void pci_restore_state(device_t dev);
void pci_save_state(device_t dev);