From 722bc5b5d901eafb96e8530cc7cf3036bff398a4 Mon Sep 17 00:00:00 2001
From: Anastasiia Lukianenko <anastasiia_lukianenko@epam.com>
Date: Thu, 6 Aug 2020 12:42:55 +0300
Subject: xen: pvblock: Add initial support for para-virtualized block driver

Add initial infrastructure for Xen para-virtualized block device.
This includes compile-time configuration and the skeleton for
the future driver implementation.
Add new class UCLASS_PVBLOCK which is going to be a parent for
virtual block devices.
Add new interface type IF_TYPE_PVBLOCK.

Implement basic driver setup by reading XenStore configuration.

Signed-off-by: Andrii Anisov <andrii_anisov@epam.com>
Signed-off-by: Anastasiia Lukianenko <anastasiia_lukianenko@epam.com>
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 cmd/Kconfig   |  7 +++++++
 cmd/Makefile  |  1 +
 cmd/pvblock.c | 30 ++++++++++++++++++++++++++++++
 3 files changed, 38 insertions(+)
 create mode 100644 cmd/pvblock.c

(limited to 'cmd')

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 23d7e27..9ad511a 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1370,6 +1370,13 @@ config CMD_USB_MASS_STORAGE
 	help
 	  USB mass storage support
 
+config CMD_PVBLOCK
+	bool "Xen para-virtualized block device"
+	depends on XEN
+	select PVBLOCK
+	help
+	  Xen para-virtualized block device support
+
 config CMD_VIRTIO
 	bool "virtio"
 	depends on VIRTIO
diff --git a/cmd/Makefile b/cmd/Makefile
index ef2a22f..3a9c974 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -174,6 +174,7 @@ obj-$(CONFIG_CMD_DFU) += dfu.o
 obj-$(CONFIG_CMD_GPT) += gpt.o
 obj-$(CONFIG_CMD_ETHSW) += ethsw.o
 obj-$(CONFIG_CMD_AXI) += axi.o
+obj-$(CONFIG_CMD_PVBLOCK) += pvblock.o
 
 # Power
 obj-$(CONFIG_CMD_PMIC) += pmic.o
diff --git a/cmd/pvblock.c b/cmd/pvblock.c
new file mode 100644
index 0000000..4e99b06
--- /dev/null
+++ b/cmd/pvblock.c
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2020 EPAM Systems Inc.
+ *
+ * XEN para-virtualized block device support
+ */
+
+#include <blk.h>
+#include <common.h>
+#include <command.h>
+
+/* Current I/O Device */
+static int pvblock_curr_device;
+
+int do_pvblock(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
+{
+	return blk_common_cmd(argc, argv, IF_TYPE_PVBLOCK,
+			      &pvblock_curr_device);
+}
+
+U_BOOT_CMD(pvblock, 5, 1, do_pvblock,
+	   "Xen para-virtualized block device",
+	   "info  - show available block devices\n"
+	   "pvblock device [dev] - show or set current device\n"
+	   "pvblock part [dev] - print partition table of one or all devices\n"
+	   "pvblock read  addr blk# cnt\n"
+	   "pvblock write addr blk# cnt - read/write `cnt'"
+	   " blocks starting at block `blk#'\n"
+	   "    to/from memory address `addr'");
+
-- 
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