[Minios-devel] [UNIKRAFT PATCH 03/17] plat/xen/drivers: Blkfront driver skeleton

[Roxana Nicolescu <nicolescu.roxana1996@xxxxxxxxx>]

This patch introduces the blkfront driver skeleton.

Signed-off-by: Roxana Nicolescu <nicolescu.roxana1996@xxxxxxxxx>
---
 plat/xen/Config.uk                 |  7 ++++
 plat/xen/Makefile.uk               | 10 ++++++
 plat/xen/drivers/blk/blkfront.c    | 70 ++++++++++++++++++++++++++++++++++++++
 plat/xen/drivers/blk/exportsyms.uk |  1 +
 4 files changed, 88 insertions(+)
 create mode 100644 plat/xen/drivers/blk/blkfront.c
 create mode 100644 plat/xen/drivers/blk/exportsyms.uk

diff --git a/plat/xen/Config.uk b/plat/xen/Config.uk
index 1ab4cc85..e6d9132c 100644
--- a/plat/xen/Config.uk
+++ b/plat/xen/Config.uk
@@ -72,5 +72,12 @@ config XEN_XENBUS
 menu "Xenbus Drivers"
         depends on XEN_XENBUS
         depends on XEN_GNTTAB
+
+config XEN_BLKFRONT
+       bool "Xenbus Blkfront Driver"
+       default n
+       depends on LIBUKBLKDEV
+       help
+               Driver for block devices
 endmenu
 endif
diff --git a/plat/xen/Makefile.uk b/plat/xen/Makefile.uk
index 69b10efc..9fa92d1e 100644
--- a/plat/xen/Makefile.uk
+++ b/plat/xen/Makefile.uk
@@ -10,6 +10,7 @@ $(eval $(call addplat_s,xen,$(CONFIG_PLAT_XEN)))
 ##
 $(eval $(call addplatlib,xen,libxenplat))
 $(eval $(call addplatlib_s,xen,libxenbus,$(CONFIG_XEN_XENBUS)))
+$(eval $(call addplatlib_s,xen,libxenblkfront,$(CONFIG_XEN_BLKFRONT)))
 
 ##
 ## Xen platform compilation settings
@@ -100,3 +101,12 @@ LIBXENBUS_SRCS-y               += 
$(LIBXENPLAT_BASE)/xenbus/xs_comms.c
 LIBXENBUS_SRCS-y               += $(LIBXENPLAT_BASE)/xenbus/xs_watch.c
 LIBXENBUS_SRCS-y               += $(LIBXENPLAT_BASE)/xenbus/xs.c
 endif
+
+ifeq ($(CONFIG_XEN_BLKFRONT),y)
+LIBXENBLKFRONT_EXPORTS               = 
$(LIBXENPLAT_BASE)/drivers/blk/exportsyms.uk
+LIBXENBLKFRONT_ASFLAGS-y            += $(LIBXENPLAT_ASFLAGS-y)
+LIBXENBLKFRONT_ASINCLUDES-y         += $(LIBXENPLAT_ASINCLUDES-y)
+LIBXENBLKFRONT_CFLAGS-y             += $(LIBXENPLAT_CFLAGS-y)
+LIBXENBLKFRONT_CINCLUDES-y          += $(LIBXENPLAT_CINCLUDES-y)
+LIBXENBLKFRONT_SRCS-y          += $(LIBXENPLAT_BASE)/drivers/blk/blkfront.c
+endif
diff --git a/plat/xen/drivers/blk/blkfront.c b/plat/xen/drivers/blk/blkfront.c
new file mode 100644
index 00000000..8ba61adb
--- /dev/null
+++ b/plat/xen/drivers/blk/blkfront.c
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Roxana Nicolescu <nicolescu.roxana1996@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 <xenbus/xenbus.h>
+
+#define DRIVER_NAME            "xen-blkfront"
+
+static struct uk_alloc *drv_allocator;
+
+static int blkfront_add_dev(struct xenbus_device *dev)
+{
+       int rc = 0;
+
+       UK_ASSERT(dev != NULL);
+
+       return rc;
+}
+
+static int blkfront_drv_init(struct uk_alloc *allocator)
+{
+       /* driver initialization */
+       if (!allocator)
+               return -EINVAL;
+
+       drv_allocator = allocator;
+       return 0;
+}
+
+static const xenbus_dev_type_t blkfront_devtypes[] = {
+       xenbus_dev_vbd,
+};
+
+static struct xenbus_driver blkfront_driver = {
+       .device_types = blkfront_devtypes,
+       .init = blkfront_drv_init,
+       .add_dev = blkfront_add_dev
+};
+
+XENBUS_REGISTER_DRIVER(&blkfront_driver);
diff --git a/plat/xen/drivers/blk/exportsyms.uk 
b/plat/xen/drivers/blk/exportsyms.uk
new file mode 100644
index 00000000..621e94f0
--- /dev/null
+++ b/plat/xen/drivers/blk/exportsyms.uk
@@ -0,0 +1 @@
+none
-- 
2.11.0


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