1 files changed, 129 insertions, 0 deletions
diff --git a/sys/dev/blackhole/blackhole.c b/sys/dev/blackhole/blackhole.c
new file mode 100644
index 0000000..9d02e50
--- /dev/null
+++ b/sys/dev/blackhole/blackhole.c
@@ -0,0 +1,129 @@
+/*-
+ * 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);