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/*-
* Copyright (c) 2011 NetApp, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/linker.h>
#include <sys/libkern.h>
#include <dev/pci/pcivar.h>
static int
linker_file_iterator(linker_file_t lf, void *arg)
{
const char *file = arg;
if (strcmp(lf->filename, file) == 0)
return (1);
else
return (0);
}
static boolean_t
pptdev(int bus, int slot, int func)
{
int found, b, s, f, n;
char *val, *cp, *cp2;
/*
* setenv pptdevs "1/2/3 4/5/6 7/8/9 10/11/12"
*/
found = 0;
cp = val = getenv("pptdevs");
while (cp != NULL && *cp != '\0') {
if ((cp2 = strchr(cp, ' ')) != NULL)
*cp2 = '\0';
n = sscanf(cp, "%d/%d/%d", &b, &s, &f);
if (n == 3 && bus == b && slot == s && func == f) {
found = 1;
break;
}
if (cp2 != NULL)
*cp2++ = ' ';
cp = cp2;
}
freeenv(val);
return (found);
}
static int
pci_blackhole_probe(device_t dev)
{
int bus, slot, func;
/*
* If 'vmm.ko' has also been loaded the don't try to claim
* any pci devices.
*/
if (linker_file_foreach(linker_file_iterator, "vmm.ko"))
return (ENXIO);
bus = pci_get_bus(dev);
slot = pci_get_slot(dev);
func = pci_get_function(dev);
if (pptdev(bus, slot, func))
return (0);
else
return (ENXIO);
}
static int
pci_blackhole_attach(device_t dev)
{
/*
* We never really want to claim the devices but just want to prevent
* other drivers from getting to them.
*/
return (ENXIO);
}
static device_method_t pci_blackhole_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, pci_blackhole_probe),
DEVMETHOD(device_attach, pci_blackhole_attach),
{ 0, 0 }
};
static driver_t pci_blackhole_driver = {
"blackhole",
pci_blackhole_methods,
};
devclass_t blackhole_devclass;
DRIVER_MODULE(blackhole, pci, pci_blackhole_driver, blackhole_devclass, 0, 0);
MODULE_DEPEND(blackhole, pci, 1, 1, 1);
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