[Xen-devel] [PATCH v10 14/20] xen: introduce xenpv bus and a dummy pvcpu device

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Since Xen PVH guests doesn't have ACPI, we need to create a dummy
bus so top level Xen devices can attach to it (instead of
attaching directly to the nexus) and a pvcpu device that will be used
to fill the pcpu->pc_device field.
---
 sys/conf/files.amd64 |    1 +
 sys/conf/files.i386  |    1 +
 sys/x86/xen/xenpv.c  |  128 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 130 insertions(+), 0 deletions(-)
 create mode 100644 sys/x86/xen/xenpv.c

diff --git a/sys/conf/files.amd64 b/sys/conf/files.amd64
index a3491da..d7c98cc 100644
--- a/sys/conf/files.amd64
+++ b/sys/conf/files.amd64
@@ -570,3 +570,4 @@ x86/xen/hvm.c                       optional        xenhvm
 x86/xen/xen_intr.c             optional        xen | xenhvm
 x86/xen/pv.c                   optional        xenhvm
 x86/xen/pvcpu_enum.c           optional        xenhvm
+x86/xen/xenpv.c                        optional        xenhvm
diff --git a/sys/conf/files.i386 b/sys/conf/files.i386
index 790296d..81142e3 100644
--- a/sys/conf/files.i386
+++ b/sys/conf/files.i386
@@ -603,3 +603,4 @@ x86/x86/tsc.c                       standard
 x86/x86/delay.c                        standard
 x86/xen/hvm.c                  optional xenhvm
 x86/xen/xen_intr.c             optional xen | xenhvm
+x86/xen/xenpv.c                        optional xen | xenhvm
diff --git a/sys/x86/xen/xenpv.c b/sys/x86/xen/xenpv.c
new file mode 100644
index 0000000..e1282cf
--- /dev/null
+++ b/sys/x86/xen/xenpv.c
@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2013 Roger Pau Monnà <roger.pau@xxxxxxxxxx>
+ * 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 THE AUTHOR AND CONTRIBUTORS 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 THE AUTHOR 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/pcpu.h>
+#include <sys/smp.h>
+
+#include <xen/xen-os.h>
+
+static devclass_t xenpv_devclass;
+
+static void
+xenpv_identify(driver_t *driver, device_t parent)
+{
+       if (!xen_domain())
+               return;
+
+       /* Make sure there's only one xenpv device. */
+       if (devclass_get_device(xenpv_devclass, 0))
+               return;
+
+       /*
+        * Use a high order number so xenpv is attached after
+        * xenpci on HVM guests.
+        */
+       BUS_ADD_CHILD(parent, 200, "xenpv", 0);
+}
+
+static int
+xenpv_probe(device_t dev)
+{
+
+       device_set_desc(dev, "Xen PV bus");
+       device_quiet(dev);
+       return (BUS_PROBE_NOWILDCARD);
+}
+
+static int
+xenpv_attach(device_t dev)
+{
+       device_t child;
+
+       if (xen_hvm_domain()) {
+               device_t xenpci;
+               devclass_t dc;
+
+               /* Make sure xenpci has been attached */
+               dc = devclass_find("xenpci");
+               if (dc == NULL)
+                       panic("unable to find xenpci devclass");
+
+               xenpci = devclass_get_device(dc, 0);
+               if (xenpci == NULL)
+                       panic("unable to find xenpci device");
+
+               if (!device_is_attached(xenpci))
+                       panic("trying to attach xenpv before xenpci");
+       }
+
+       /*
+        * Let our child drivers identify any child devices that they
+        * can find.  Once that is done attach any devices that we
+        * found.
+        */
+       bus_generic_probe(dev);
+       bus_generic_attach(dev);
+
+       if (!devclass_get_device(devclass_find("isa"), 0)) {
+               child = BUS_ADD_CHILD(dev, 0, "isa", 0);
+               if (child == NULL)
+                       panic("xenpv_attach isa");
+               device_probe_and_attach(child);
+       }
+
+       return 0;
+}
+
+static device_method_t xenpv_methods[] = {
+       /* Device interface */
+       DEVMETHOD(device_identify,      xenpv_identify),
+       DEVMETHOD(device_probe,         xenpv_probe),
+       DEVMETHOD(device_attach,        xenpv_attach),
+       DEVMETHOD(device_suspend,       bus_generic_suspend),
+       DEVMETHOD(device_resume,        bus_generic_resume),
+
+       /* Bus interface */
+       DEVMETHOD(bus_add_child,        bus_generic_add_child),
+
+       DEVMETHOD_END
+};
+
+static driver_t xenpv_driver = {
+       "xenpv",
+       xenpv_methods,
+       1,                      /* no softc */
+};
+
+DRIVER_MODULE(xenpv, nexus, xenpv_driver, xenpv_devclass, 0, 0);
-- 
1.7.7.5 (Apple Git-26)


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