svn commit: r272319 - in head/sys: conf dev/xen/xenstore
Roger Pau Monné
royger at FreeBSD.org
Tue Sep 30 17:37:27 UTC 2014
Author: royger
Date: Tue Sep 30 17:37:26 2014
New Revision: 272319
URL: http://svnweb.freebsd.org/changeset/base/272319
Log:
xen: add xenstored user-space device
This device is used by the user-space daemon that runs xenstore
(xenstored). It allows xenstored to map the xenstore memory page, and
reports the event channel xenstore is using.
Sponsored by: Citrix Systems R&D
dev/xen/xenstore/xenstored_dev.c:
- Add the xenstored character device that's used to map the xenstore
memory into user-space, and to report the event channel used by
xenstore.
conf/files:
- Add the device to the build process.
Added:
head/sys/dev/xen/xenstore/xenstored_dev.c (contents, props changed)
Modified:
head/sys/conf/files
Modified: head/sys/conf/files
==============================================================================
--- head/sys/conf/files Tue Sep 30 17:31:04 2014 (r272318)
+++ head/sys/conf/files Tue Sep 30 17:37:26 2014 (r272319)
@@ -2640,6 +2640,7 @@ dev/xen/timer/timer.c optional xen | xe
dev/xen/pvcpu/pvcpu.c optional xen | xenhvm
dev/xen/xenstore/xenstore.c optional xen | xenhvm
dev/xen/xenstore/xenstore_dev.c optional xen | xenhvm
+dev/xen/xenstore/xenstored_dev.c optional xen | xenhvm
dev/xl/if_xl.c optional xl pci
dev/xl/xlphy.c optional xl pci
fs/autofs/autofs.c optional autofs
Added: head/sys/dev/xen/xenstore/xenstored_dev.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/dev/xen/xenstore/xenstored_dev.c Tue Sep 30 17:37:26 2014 (r272319)
@@ -0,0 +1,169 @@
+/*
+ * Copyright (c) 2014 Roger Pau Monné <roger.pau at citrix.com>
+ * 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/types.h>
+#include <sys/cdefs.h>
+#include <sys/errno.h>
+#include <sys/uio.h>
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/conf.h>
+#include <sys/module.h>
+
+#include <xen/xen-os.h>
+
+#include <xen/hypervisor.h>
+#include <xen/xenstore/xenstorevar.h>
+#include <xen/xenstore/xenstore_internal.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#define XSD_READ_SIZE 20
+
+static int xsd_dev_read(struct cdev *dev, struct uio *uio, int ioflag);
+static int xsd_dev_mmap(struct cdev *dev, vm_ooffset_t offset,
+ vm_paddr_t *paddr, int nprot, vm_memattr_t *memattr);
+
+
+static struct cdevsw xsd_dev_cdevsw = {
+ .d_version = D_VERSION,
+ .d_read = xsd_dev_read,
+ .d_mmap = xsd_dev_mmap,
+ .d_name = "xsd_dev",
+};
+
+static int
+xsd_dev_read(struct cdev *dev, struct uio *uio, int ioflag)
+{
+ char evtchn[XSD_READ_SIZE];
+ int error, len;
+
+ len = snprintf(evtchn, sizeof(evtchn), "%u",
+ HYPERVISOR_start_info->store_evtchn);
+ if (len < 0 || len > uio->uio_resid)
+ return (EINVAL);
+
+ error = uiomove(evtchn, len, uio);
+ if (error)
+ return (error);
+
+ return (0);
+}
+
+static int
+xsd_dev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
+ int nprot, vm_memattr_t *memattr)
+{
+
+ if (offset != 0)
+ return (EINVAL);
+
+ *paddr = pmap_kextract((vm_offset_t)xen_store);
+
+ return (0);
+}
+
+/*------------------ Private Device Attachment Functions --------------------*/
+/**
+ * \brief Identify instances of this device type in the system.
+ *
+ * \param driver The driver performing this identify action.
+ * \param parent The NewBus parent device for any devices this method adds.
+ */
+static void
+xsd_dev_identify(driver_t *driver __unused, device_t parent)
+{
+
+ if (!xen_pv_domain())
+ return;
+ if (HYPERVISOR_start_info->store_mfn != 0)
+ return;
+
+ /*
+ * Only attach if xenstore is not available, because we are the
+ * domain that's supposed to run it.
+ */
+ BUS_ADD_CHILD(parent, 0, driver->name, 0);
+}
+
+/**
+ * \brief Probe for the existence of the Xenstored device
+ *
+ * \param dev NewBus device_t for this instance.
+ *
+ * \return Always returns 0 indicating success.
+ */
+static int
+xsd_dev_probe(device_t dev)
+{
+
+ device_set_desc(dev, "Xenstored user-space device");
+ return (BUS_PROBE_NOWILDCARD);
+}
+
+/**
+ * \brief Attach the Xenstored device.
+ *
+ * \param dev NewBus device_t for this instance.
+ *
+ * \return On success, 0. Otherwise an errno value indicating the
+ * type of failure.
+ */
+static int
+xsd_dev_attach(device_t dev)
+{
+ struct cdev *xsd_cdev;
+
+ xsd_cdev = make_dev(&xsd_dev_cdevsw, 0, UID_ROOT, GID_WHEEL, 0400,
+ "xen/xenstored");
+ if (xsd_cdev == NULL)
+ return (EINVAL);
+
+ return (0);
+}
+
+/*-------------------- Private Device Attachment Data -----------------------*/
+static device_method_t xsd_dev_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_identify, xsd_dev_identify),
+ DEVMETHOD(device_probe, xsd_dev_probe),
+ DEVMETHOD(device_attach, xsd_dev_attach),
+
+ DEVMETHOD_END
+};
+
+DEFINE_CLASS_0(xsd_dev, xsd_dev_driver, xsd_dev_methods, 0);
+devclass_t xsd_dev_devclass;
+
+DRIVER_MODULE(xsd_dev, xenpv, xsd_dev_driver, xsd_dev_devclass,
+ NULL, NULL);
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