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

[Costin Lupu <costin.lup@xxxxxxxxx>]

Reviewed-by: Costin Lupu <costin.lupu@xxxxxxxxx>

On 5/29/19 11:39 AM, Roxana Nicolescu wrote:
> 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
> 

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