[PATCH v2 4/6] cmd: Add flush support for all blk devices

[dmukhin at ford.com]

From: Denis Mukhin <dmukhin at ford.com> 

Introduce `flush` subcommand for all blk devices to allow committing
dirty data explicitly to the given block device.

Signed-off-by: Denis Mukhin <dmukhin at ford.com>
---
Changes since v1:
- updated commit message
- updated blk commands to enable flush
---
 cmd/blk_common.c | 14 ++++++++++++++
 cmd/ide.c        |  1 +
 cmd/nvme.c       |  1 +
 cmd/pvblock.c    |  1 +
 cmd/sata.c       |  1 +
 cmd/scsi.c       |  1 +
 cmd/usb.c        |  1 +
 cmd/virtio.c     |  1 +
 8 files changed, 21 insertions(+)

diff --git a/cmd/blk_common.c b/cmd/blk_common.c
index 56529702a470..d3b00e10f17c 100644
--- a/cmd/blk_common.c
+++ b/cmd/blk_common.c
@@ -37,6 +37,20 @@ int blk_common_cmd(int argc, char *const argv[], enum uclass_id uclass_id,
 				printf("\nno %s partition table available\n",
 				       if_name);
 			return CMD_RET_SUCCESS;
+		} else if (strncmp(argv[1], "flush", 5) == 0) {
+			struct blk_desc *desc;
+			int ret;
+
+			ret = blk_get_desc(uclass_id, *cur_devnump, &desc);
+			if (ret)
+				return CMD_RET_FAILURE;
+
+			if (blk_dflush(desc)) {
+				printf("\nfailed to flush device %s\n", if_name);
+				return CMD_RET_FAILURE;
+			}
+
+			return CMD_RET_SUCCESS;
 		}
 		return CMD_RET_USAGE;
 	case 3:
diff --git a/cmd/ide.c b/cmd/ide.c
index f99fb6f58246..16833e30319c 100644
--- a/cmd/ide.c
+++ b/cmd/ide.c
@@ -63,6 +63,7 @@ U_BOOT_CMD(ide, 5, 1, do_ide,
 	   "IDE sub-system",
 	   "reset - reset IDE controller\n"
 	   "ide info  - show available IDE devices\n"
+	   "ide flush - commit all dirty data to the current IDE device\n"
 	   "ide device [dev] - show or set current device\n"
 	   "ide part [dev] - print partition table of one or all IDE devices\n"
 	   "ide read  addr blk# cnt\n"
diff --git a/cmd/nvme.c b/cmd/nvme.c
index f2c9acba5c32..dbccb69042bc 100644
--- a/cmd/nvme.c
+++ b/cmd/nvme.c
@@ -47,6 +47,7 @@ U_BOOT_CMD(
 	"scan - scan NVMe devices\n"
 	"nvme detail - show details of current NVMe device\n"
 	"nvme info - show all available NVMe devices\n"
+	"nvme flush - commit all dirty data to the current NVMe device\n"
 	"nvme device [dev] - show or set current NVMe device\n"
 	"nvme part [dev] - print partition table of one or all NVMe devices\n"
 	"nvme read addr blk# cnt - read `cnt' blocks starting at block\n"
diff --git a/cmd/pvblock.c b/cmd/pvblock.c
index 3a83ac9cd92c..5e4a98a6b13b 100644
--- a/cmd/pvblock.c
+++ b/cmd/pvblock.c
@@ -20,6 +20,7 @@ int do_pvblock(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 U_BOOT_CMD(pvblock, 5, 1, do_pvblock,
 	   "Xen para-virtualized block device",
 	   "info  - show available block devices\n"
+	   "pvblock flush - commit all dirty data to the current device\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"
diff --git a/cmd/sata.c b/cmd/sata.c
index 8b923f9378b2..417e027cba4f 100644
--- a/cmd/sata.c
+++ b/cmd/sata.c
@@ -119,6 +119,7 @@ U_BOOT_CMD(
 	"init - init SATA sub system\n"
 	"sata stop [dev] - disable SATA sub system or device\n"
 	"sata info - show available SATA devices\n"
+	"sata flush - commit all dirty data to the current SATA device\n"
 	"sata device [dev] - show or set current device\n"
 	"sata part [dev] - print partition table\n"
 	"sata read addr blk# cnt\n"
diff --git a/cmd/scsi.c b/cmd/scsi.c
index ad7d8a4b6644..39be208f337a 100644
--- a/cmd/scsi.c
+++ b/cmd/scsi.c
@@ -47,6 +47,7 @@ U_BOOT_CMD(
 	"SCSI sub-system",
 	"scsi info  - show available SCSI devices\n"
 	"scsi scan  - (re-)scan SCSI bus\n"
+	"scsi flush - commit all dirty data to the current SCSI device\n"
 	"scsi device [dev] - show or set current device\n"
 	"scsi part [dev] - print partition table of one or all SCSI devices\n"
 	"scsi read addr blk# cnt - read `cnt' blocks starting at block `blk#'\n"
diff --git a/cmd/usb.c b/cmd/usb.c
index 13a2996c1f00..3e156f54c50b 100644
--- a/cmd/usb.c
+++ b/cmd/usb.c
@@ -706,6 +706,7 @@ U_BOOT_CMD(
 	"    Available modes: J, K, S[E0_NAK], P[acket], F[orce_Enable]\n"
 #ifdef CONFIG_USB_STORAGE
 	"usb storage - show details of USB storage devices\n"
+	"usb flush - commit all dirty data to the current USB storage\n"
 	"usb dev [dev] - show or set current USB storage device\n"
 	"usb part [dev] - print partition table of one or all USB storage"
 	"    devices\n"
diff --git a/cmd/virtio.c b/cmd/virtio.c
index a42a563ab727..94f1e82cc902 100644
--- a/cmd/virtio.c
+++ b/cmd/virtio.c
@@ -44,6 +44,7 @@ U_BOOT_CMD(
 	"virtio block devices sub-system",
 	"scan - initialize virtio bus\n"
 	"virtio info - show all available virtio block devices\n"
+	"virtio flush - commit all dirty data to the current virtio block device\n"
 	"virtio device [dev] - show or set current virtio block device\n"
 	"virtio part [dev] - print partition table of one or all virtio block devices\n"
 	"virtio read addr blk# cnt - read `cnt' blocks starting at block\n"
-- 
2.54.0