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Each processor socket in a QPI system has a special PCI bus for the

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"uncore" devices (such as the memory controller) in that socket.  Stop
hardcoding support for two busses, but instead start probing buses at
domain 0, bus 255 and walk down until a bus probe fails.  Also, do not probe
a bus if it has already been enumerated elsewhere (e.g. if ACPI ever
enumerates these buses in the future).
This commit is contained in:
John Baldwin 2010-09-07 13:50:02 +00:00
parent 2751839107
commit e83ea6241a
1 changed files with 45 additions and 13 deletions
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58
sys/x86/pci/qpi.c
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@ -47,6 +47,7 @@ __FBSDID("$FreeBSD$");
#include <machine/pci_cfgreg.h>
#include <machine/specialreg.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcib_private.h>
#include "pcib_if.h"
@ -84,31 +85,62 @@ qpi_probe(device_t dev)
return (BUS_PROBE_SPECIFIC);
}
/*
* Look for a PCI bus with the specified bus address. If one is found,
* add a pcib device and return 0. Otherwise, return an error code.
*/
static int
qpi_attach(device_t dev)
qpi_probe_pcib(device_t dev, int bus)
{
struct qpi_device *qdev;
device_t child;
uint32_t devid;
/*
* Add two Host-PCI bridge devices, one for PCI bus 254 and
* one for PCI bus 255.
* If a PCI bus already exists for this bus number, then
* fail.
*/
child = BUS_ADD_CHILD(dev, 0, "pcib", -1);
if (child == NULL)
panic("%s: failed to add pci bus 254",
device_get_nameunit(dev));
qdev = malloc(sizeof(struct qpi_device), M_QPI, M_WAITOK);
qdev->qd_pcibus = 254;
device_set_ivars(child, qdev);
if (pci_find_bsf(bus, 0, 0) != NULL)
return (EEXIST);
/*
* Attempt to read the device id for device 0, function 0 on
* the bus. A value of 0xffffffff means that the bus is not
* present.
*/
devid = pci_cfgregread(bus, 0, 0, PCIR_DEVVENDOR, 4);
if (devid == 0xffffffff)
return (ENOENT);
if ((devid & 0xffff) != 0x8086) {
device_printf(dev,
"Device at pci%d.0.0 has non-Intel vendor 0x%x\n", bus,
devid & 0xffff);
return (ENXIO);
}
child = BUS_ADD_CHILD(dev, 0, "pcib", -1);
if (child == NULL)
panic("%s: failed to add pci bus 255",
device_get_nameunit(dev));
panic("%s: failed to add pci bus %d", device_get_nameunit(dev),
bus);
qdev = malloc(sizeof(struct qpi_device), M_QPI, M_WAITOK);
qdev->qd_pcibus = 255;
qdev->qd_pcibus = bus;
device_set_ivars(child, qdev);
return (0);
}
static int
qpi_attach(device_t dev)
{
int bus;
/*
* Each processor socket has a dedicated PCI bus counting down from
* 255. We keep probing buses until one fails.
*/
for (bus = 255;; bus--)
if (qpi_probe_pcib(dev, bus) != 0)
break;
return (bus_generic_attach(dev));
}