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>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 23d7e27..9ad511a 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1370,6 +1370,13 @@
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-$(CONFIG_CMD_GPT) += gpt.o
obj-$(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'");
+