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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>
This commit is contained in:
Anastasiia Lukianenko 2020-08-06 12:42:55 +03:00 committed by Tom Rini
parent c850674ff7
commit 722bc5b5d9
15 changed files with 223 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
cmd/Kconfig
View File

@ -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

1
cmd/Makefile
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@ -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

30
cmd/pvblock.c Normal file
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@ -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'");

14
common/board_r.c
View File

@ -49,6 +49,7 @@
#include <nand.h>
#include <of_live.h>
#include <onenand_uboot.h>
#include <pvblock.h>
#include <scsi.h>
#include <serial.h>
#include <status_led.h>
@ -475,6 +476,16 @@ static int initr_xen(void)
return 0;
}
#endif
#ifdef CONFIG_PVBLOCK
static int initr_pvblock(void)
{
puts("PVBLOCK: ");
pvblock_init();
return 0;
}
#endif
/*
* Tell if it's OK to load the environment early in boot.
*
@ -774,6 +785,9 @@ static init_fnc_t init_sequence_r[] = {
#endif
#ifdef CONFIG_XEN
initr_xen,
#endif
#ifdef CONFIG_PVBLOCK
initr_pvblock,
#endif
initr_env,
#ifdef CONFIG_SYS_BOOTPARAMS_LEN

4
configs/xenguest_arm64_defconfig
View File

@ -14,6 +14,8 @@ CONFIG_CMD_BOOTD=n
CONFIG_CMD_BOOTEFI=n
CONFIG_CMD_BOOTEFI_HELLO_COMPILE=n
CONFIG_CMD_ELF=n
CONFIG_CMD_EXT4=y
CONFIG_CMD_FAT=y
CONFIG_CMD_GO=n
CONFIG_CMD_RUN=n
CONFIG_CMD_IMI=n
@ -41,6 +43,8 @@ CONFIG_CMD_LZMADEC=n
CONFIG_CMD_SAVEENV=n
CONFIG_CMD_UMS=n
CONFIG_CMD_PVBLOCK=y
#CONFIG_USB=n
# CONFIG_ISO_PARTITION is not set

4
disk/part.c
View File

@ -149,6 +149,7 @@ void dev_print (struct blk_desc *dev_desc)
case IF_TYPE_MMC:
case IF_TYPE_USB:
case IF_TYPE_NVME:
case IF_TYPE_PVBLOCK:
printf ("Vendor: %s Rev: %s Prod: %s\n",
dev_desc->vendor,
dev_desc->revision,
@ -288,6 +289,9 @@ static void print_part_header(const char *type, struct blk_desc *dev_desc)
case IF_TYPE_NVME:
puts ("NVMe");
break;
case IF_TYPE_PVBLOCK:
puts("PV BLOCK");
break;
case IF_TYPE_VIRTIO:
puts("VirtIO");
break;

2
drivers/Kconfig
View File

@ -136,6 +136,8 @@ source "drivers/w1-eeprom/Kconfig"
source "drivers/watchdog/Kconfig"
source "drivers/xen/Kconfig"
config PHYS_TO_BUS
bool "Custom physical to bus address mapping"
help

2
drivers/block/blk-uclass.c
View File

@ -28,6 +28,7 @@ static const char *if_typename_str[IF_TYPE_COUNT] = {
[IF_TYPE_NVME] = "nvme",
[IF_TYPE_EFI] = "efi",
[IF_TYPE_VIRTIO] = "virtio",
[IF_TYPE_PVBLOCK] = "pvblock",
};
static enum uclass_id if_type_uclass_id[IF_TYPE_COUNT] = {
@ -43,6 +44,7 @@ static enum uclass_id if_type_uclass_id[IF_TYPE_COUNT] = {
[IF_TYPE_NVME] = UCLASS_NVME,
[IF_TYPE_EFI] = UCLASS_EFI,
[IF_TYPE_VIRTIO] = UCLASS_VIRTIO,
[IF_TYPE_PVBLOCK] = UCLASS_PVBLOCK,
};
static enum if_type if_typename_to_iftype(const char *if_typename)

10
drivers/xen/Kconfig Normal file
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@ -0,0 +1,10 @@
config PVBLOCK
bool "Xen para-virtualized block device"
depends on DM
select BLK
select HAVE_BLOCK_DEVICE
help
This driver implements the front-end of the Xen virtual
block device driver. It communicates with a back-end driver
in another domain which drives the actual block device.

2
drivers/xen/Makefile
View File

@ -6,3 +6,5 @@ obj-y += hypervisor.o
obj-y += events.o
obj-y += xenbus.o
obj-y += gnttab.o
obj-$(CONFIG_PVBLOCK) += pvblock.o

120
drivers/xen/pvblock.c Normal file
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@ -0,0 +1,120 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2020 EPAM Systems Inc.
*/
#include <blk.h>
#include <common.h>
#include <dm.h>
#include <dm/device-internal.h>
#define DRV_NAME "pvblock"
#define DRV_NAME_BLK "pvblock_blk"
struct blkfront_dev {
char dummy;
};
static int init_blkfront(unsigned int devid, struct blkfront_dev *dev)
{
return 0;
}
static void shutdown_blkfront(struct blkfront_dev *dev)
{
}
ulong pvblock_blk_read(struct udevice *udev, lbaint_t blknr, lbaint_t blkcnt,
void *buffer)
{
return 0;
}
ulong pvblock_blk_write(struct udevice *udev, lbaint_t blknr, lbaint_t blkcnt,
const void *buffer)
{
return 0;
}
static int pvblock_blk_bind(struct udevice *udev)
{
return 0;
}
static int pvblock_blk_probe(struct udevice *udev)
{
struct blkfront_dev *blk_dev = dev_get_priv(udev);
int ret;
ret = init_blkfront(0, blk_dev);
if (ret < 0)
return ret;
return 0;
}
static int pvblock_blk_remove(struct udevice *udev)
{
struct blkfront_dev *blk_dev = dev_get_priv(udev);
shutdown_blkfront(blk_dev);
return 0;
}
static const struct blk_ops pvblock_blk_ops = {
.read = pvblock_blk_read,
.write = pvblock_blk_write,
};
U_BOOT_DRIVER(pvblock_blk) = {
.name = DRV_NAME_BLK,
.id = UCLASS_BLK,
.ops = &pvblock_blk_ops,
.bind = pvblock_blk_bind,
.probe = pvblock_blk_probe,
.remove = pvblock_blk_remove,
.priv_auto_alloc_size = sizeof(struct blkfront_dev),
.flags = DM_FLAG_OS_PREPARE,
};
/*******************************************************************************
* Para-virtual block device class
*******************************************************************************/
void pvblock_init(void)
{
struct driver_info info;
struct udevice *udev;
struct uclass *uc;
int ret;
/*
* At this point Xen drivers have already initialized,
* so we can instantiate the class driver and enumerate
* virtual block devices.
*/
info.name = DRV_NAME;
ret = device_bind_by_name(gd->dm_root, false, &info, &udev);
if (ret < 0)
printf("Failed to bind " DRV_NAME ", ret: %d\n", ret);
/* Bootstrap virtual block devices class driver */
ret = uclass_get(UCLASS_PVBLOCK, &uc);
if (ret)
return;
uclass_foreach_dev_probe(UCLASS_PVBLOCK, udev);
}
static int pvblock_probe(struct udevice *udev)
{
return 0;
}
U_BOOT_DRIVER(pvblock_drv) = {
.name = DRV_NAME,
.id = UCLASS_PVBLOCK,
.probe = pvblock_probe,
};
UCLASS_DRIVER(pvblock) = {
.name = DRV_NAME,
.id = UCLASS_PVBLOCK,
};

1
include/blk.h
View File

@ -33,6 +33,7 @@ enum if_type {
IF_TYPE_HOST,
IF_TYPE_NVME,
IF_TYPE_EFI,
IF_TYPE_PVBLOCK,
IF_TYPE_VIRTIO,
IF_TYPE_COUNT, /* Number of interface types */

8
include/configs/xenguest_arm64.h
View File

@ -41,4 +41,12 @@
#define CONFIG_CMDLINE_TAG 1
#define CONFIG_INITRD_TAG 1
#define CONFIG_CMD_RUN
#undef CONFIG_EXTRA_ENV_SETTINGS
#define CONFIG_EXTRA_ENV_SETTINGS \
"loadimage=ext4load pvblock 0 0x90000000 /boot/Image;\0" \
"pvblockboot=run loadimage;" \
"booti 0x90000000 - 0x88000000;\0"
#endif /* __XENGUEST_ARM64_H */

1
include/dm/uclass-id.h
View File

@ -123,6 +123,7 @@ enum uclass_id {
UCLASS_W1, /* Dallas 1-Wire bus */
UCLASS_W1_EEPROM, /* one-wire EEPROMs */
UCLASS_WDT, /* Watchdog Timer driver */
UCLASS_PVBLOCK, /* Xen virtual block device */
UCLASS_COUNT,
UCLASS_INVALID = -1,

17
include/pvblock.h Normal file
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@ -0,0 +1,17 @@
/* SPDX-License-Identifier: GPL-2.0+
*
* (C) 2020 EPAM Systems Inc.
*/
#ifndef _PVBLOCK_H
#define _PVBLOCK_H
/**
* pvblock_init() - Initialize para-virtual block device class driver
*
* Bind PV block to UCLASS_ROOT device and probe all UCLASS_PVBLOCK
* virtual block devices.
*/
void pvblock_init(void);
#endif /* _PVBLOCK_H */