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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Minios-devel] [UNIKRAFT PATCH 3/9] plat/xen/drivers/9p: Initialize xenbus device
From: Cristian Banu <cristb@xxxxxxxxx>
This patch adds the xenbus function responsible for reading data written
by the toolstack and the backend from the xenstore, required for
initializing a 9pfront device.
Signed-off-by: Cristian Banu <cristb@xxxxxxxxx>
---
plat/xen/Makefile.uk | 1 +
plat/xen/drivers/9p/9pfront.h | 53 +++++++++++
plat/xen/drivers/9p/9pfront_xb.h | 53 +++++++++++
plat/xen/drivers/9p/9pfront_xs.c | 156 +++++++++++++++++++++++++++++++
4 files changed, 263 insertions(+)
create mode 100644 plat/xen/drivers/9p/9pfront.h
create mode 100644 plat/xen/drivers/9p/9pfront_xb.h
create mode 100644 plat/xen/drivers/9p/9pfront_xs.c
diff --git a/plat/xen/Makefile.uk b/plat/xen/Makefile.uk
index 9dbc7725..1d7e7cff 100644
--- a/plat/xen/Makefile.uk
+++ b/plat/xen/Makefile.uk
@@ -119,4 +119,5 @@ LIBXEN9PFRONT_ASINCLUDES-y += $(LIBXENPLAT_ASINCLUDES-y)
LIBXEN9PFRONT_CFLAGS-y += $(LIBXENPLAT_CFLAGS-y)
LIBXEN9PFRONT_CINCLUDES-y += $(LIBXENPLAT_CINCLUDES-y)
LIBXEN9PFRONT_SRCS-y += $(LIBXENPLAT_BASE)/drivers/9p/9pfront.c
+LIBXEN9PFRONT_SRCS-y += $(LIBXENPLAT_BASE)/drivers/9p/9pfront_xs.c
endif
diff --git a/plat/xen/drivers/9p/9pfront.h b/plat/xen/drivers/9p/9pfront.h
new file mode 100644
index 00000000..0dd99d6c
--- /dev/null
+++ b/plat/xen/drivers/9p/9pfront.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Cristian Banu <cristb@xxxxxxxxx>
+ *
+ * Copyright (c) 2019, University Politehnica of Bucharest. 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.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef __9PFRONT_H__
+#define __9PFRONT_H__
+
+#include <uk/config.h>
+#include <uk/essentials.h>
+#include <uk/list.h>
+
+struct p9front_dev {
+ /* Xenbus device. */
+ struct xenbus_device *xendev;
+ /* Number of maximum rings, read from xenstore. */
+ int nb_max_rings;
+ /* Maximum ring page order, read from xenstore. */
+ int max_ring_page_order;
+ /* Mount tag for this device, read from xenstore. */
+ char *tag;
+};
+
+#endif /* __9PFRONT_H__ */
diff --git a/plat/xen/drivers/9p/9pfront_xb.h b/plat/xen/drivers/9p/9pfront_xb.h
new file mode 100644
index 00000000..224df7af
--- /dev/null
+++ b/plat/xen/drivers/9p/9pfront_xb.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Cristian Banu <cristb@xxxxxxxxx>
+ *
+ * Copyright (c) 2019, University Politehnica of Bucharest. 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.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef __9PFRONT_XB_H__
+#define __9PFRONT_XB_H__
+
+#include "9pfront.h"
+
+/**
+ * Reads device information from the xenstore, such as the mount tag
+ * and details about the device rings.
+ *
+ * @param p9fdev
+ * 9P frontend device
+ * @return
+ * - (0): Successful.
+ * - (-EINVAL): Invalid data.
+ * - (< 0): Error while reading.
+ */
+int p9front_xb_init(struct p9front_dev *p9fdev);
+
+#endif /* __9PFRONT_XB_H__ */
diff --git a/plat/xen/drivers/9p/9pfront_xs.c b/plat/xen/drivers/9p/9pfront_xs.c
new file mode 100644
index 00000000..5b5dc2e4
--- /dev/null
+++ b/plat/xen/drivers/9p/9pfront_xs.c
@@ -0,0 +1,156 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Cristian Banu <cristb@xxxxxxxxx>
+ *
+ * Copyright (c) 2019, University Politehnica of Bucharest. 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.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <uk/config.h>
+#include <uk/assert.h>
+#include <uk/essentials.h>
+#include <uk/errptr.h>
+#include <xenbus/xs.h>
+#include <xenbus/client.h>
+
+#include "9pfront_xb.h"
+
+static int xs_read_backend_info(struct xenbus_device *xendev)
+{
+ int rc, val;
+ char path[strlen(xendev->nodename) + sizeof("/backend-id")];
+
+ /* Read backend id. */
+ sprintf(path, "%s/backend-id", xendev->nodename);
+ rc = xs_read_integer(XBT_NIL, path, &val);
+ if (rc)
+ goto out;
+ xendev->otherend_id = (domid_t)val;
+
+ /* Read backend path. */
+ xendev->otherend = xs_read(XBT_NIL, xendev->nodename, "backend");
+ if (PTRISERR(xendev->otherend)) {
+ rc = PTR2ERR(xendev->otherend);
+ xendev->otherend = NULL;
+ }
+
+out:
+ return rc;
+}
+
+static int xs_read_backend_ring_info(struct xenbus_device *xendev,
+ int *nb_max_rings,
+ int *max_ring_page_order)
+{
+ int rc;
+ char *int_str;
+
+ /* Read max-rings. */
+ int_str = xs_read(XBT_NIL, xendev->otherend, "max-rings");
+ if (PTRISERR(int_str)) {
+ rc = PTR2ERR(int_str);
+ uk_pr_err("Error: %d\n", rc);
+ goto out;
+ }
+
+ *nb_max_rings = strtol(int_str, NULL, 10);
+ free(int_str);
+
+ /* Read max-ring-page-order. */
+ int_str = xs_read(XBT_NIL, xendev->otherend, "max-ring-page-order");
+ if (PTRISERR(int_str)) {
+ rc = PTR2ERR(int_str);
+ uk_pr_err("Error: %d\n", rc);
+ goto out;
+ }
+
+ *max_ring_page_order = strtol(int_str, NULL, 10);
+ free(int_str);
+ rc = 0;
+
+out:
+ return rc;
+}
+
+int p9front_xb_init(struct p9front_dev *p9fdev)
+{
+ struct xenbus_device *xendev;
+ char *versions;
+ int rc;
+
+ UK_ASSERT(p9fdev != NULL);
+
+ xendev = p9fdev->xendev;
+ UK_ASSERT(xendev != NULL);
+
+ /* Read backend node and backend id. */
+ rc = xs_read_backend_info(xendev);
+ if (rc) {
+ uk_pr_err("Error initializing backend node and id.\n");
+ goto out;
+ }
+
+ /* Check versions string. */
+ versions = xs_read(XBT_NIL, xendev->otherend, "versions");
+ if (PTRISERR(versions)) {
+ uk_pr_err("Error reading backend version information.\n");
+ rc = PTR2ERR(versions);
+ goto out;
+ }
+
+ if (strcmp(versions, "1")) {
+ uk_pr_err("Backend does not support xen protocol version 1.\n");
+ free(versions);
+ rc = -EINVAL;
+ goto out;
+ }
+ free(versions);
+
+ /* Read ring information. */
+ rc = xs_read_backend_ring_info(xendev, &p9fdev->nb_max_rings,
+ &p9fdev->max_ring_page_order);
+ if (rc) {
+ uk_pr_err("Error reading backend ring information.\n");
+ goto out;
+ }
+
+ /* Read tag. */
+ p9fdev->tag = xs_read(XBT_NIL, xendev->nodename, "tag");
+ if (PTRISERR(p9fdev->tag)) {
+ uk_pr_err("Error reading 9pfs mount tag.\n");
+ rc = PTR2ERR(p9fdev->tag);
+ p9fdev->tag = NULL;
+ }
+
+out:
+ return rc;
+}
--
2.20.1
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