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* [ndctl PATCH v3] ndctl: Introduce dirty-dimm command
@ 2018-09-18 20:10 Dan Williams
  0 siblings, 0 replies; only message in thread
From: Dan Williams @ 2018-09-18 20:10 UTC (permalink / raw)
  To: linux-nvdimm

Some DIMMs provide a facility to track dirty-shutdown events. The
counter only rolls forward after the OS sets a latch. This allows the
agent tracking dirty shutdowns to ignore events that occur while the
capacity has not been written. For these DIMMs dirty-dimm will trigger
the counter to roll to the next state. The shutdown state can be
retrieved with 'ndctl list -DH'

Cc: Keith Busch <keith.busch@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
Changes since v2:
* report whether ndctl_cmd_submit() suceeded (vishal)

 Documentation/ndctl/Makefile.am          |    1 +
 Documentation/ndctl/ndctl-dirty-dimm.txt |   29 +++++++++++++++++++++++++++
 builtin.h                                |    1 +
 ndctl/dimm.c                             |   32 ++++++++++++++++++++++++++++++
 ndctl/ndctl.c                            |    1 +
 5 files changed, 64 insertions(+)
 create mode 100644 Documentation/ndctl/ndctl-dirty-dimm.txt

diff --git a/Documentation/ndctl/Makefile.am b/Documentation/ndctl/Makefile.am
index a30b139ba3a3..1a826bb001be 100644
--- a/Documentation/ndctl/Makefile.am
+++ b/Documentation/ndctl/Makefile.am
@@ -38,6 +38,7 @@ man1_MANS = \
 	ndctl-disable-region.1 \
 	ndctl-enable-dimm.1 \
 	ndctl-disable-dimm.1 \
+	ndctl-dirty-dimm.1 \
 	ndctl-enable-namespace.1 \
 	ndctl-disable-namespace.1 \
 	ndctl-create-namespace.1 \
diff --git a/Documentation/ndctl/ndctl-dirty-dimm.txt b/Documentation/ndctl/ndctl-dirty-dimm.txt
new file mode 100644
index 000000000000..02a30fe85f53
--- /dev/null
+++ b/Documentation/ndctl/ndctl-dirty-dimm.txt
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0
+
+ndctl-dirty-dimm(1)
+===================
+
+NAME
+----
+ndctl-dirty-dimm - set dimm to record the next dirty shutdown event
+
+SYNOPSIS
+--------
+[verse]
+'ndctl dirty-dimm <nmem0> [<nmem1>..<nmemN>]'
+
+Some NVDIMMs have the capability to detect 'flush failed' events whereby
+data that is pending in buffers at the time of system power loss fail to
+be flushed out to media. Some DIMMs go further to count how many times
+such fatal events occur, but only roll the count in response to a latch
+being set. The 'dirty-dimm' command sets this latch on those devices and
+is meant to be called in advance to any writes to media.
+
+OPTIONS
+-------
+<nmem>::
+include::xable-dimm-options.txt[]
+
+SEE ALSO
+--------
+http://pmem.io/documents/NVDIMM_DSM_Interface-V1.7.pdf[NVDIMM DSM Inteface]
diff --git a/builtin.h b/builtin.h
index 675a6ce79b9c..1157243cdf60 100644
--- a/builtin.h
+++ b/builtin.h
@@ -48,4 +48,5 @@ int cmd_bat(int argc, const char **argv, void *ctx);
 #endif
 int cmd_update_firmware(int argc, const char **argv, void *ctx);
 int cmd_inject_smart(int argc, const char **argv, void *ctx);
+int cmd_dirty_dimm(int argc, const char **argv, void *ctx);
 #endif /* _NDCTL_BUILTIN_H_ */
diff --git a/ndctl/dimm.c b/ndctl/dimm.c
index a4203f354000..2d658dab34a5 100644
--- a/ndctl/dimm.c
+++ b/ndctl/dimm.c
@@ -61,6 +61,23 @@ static int action_zero(struct ndctl_dimm *dimm, struct action_context *actx)
 	return ndctl_dimm_zero_labels(dimm);
 }
 
+static int action_dirty(struct ndctl_dimm *dimm, struct action_context *actx)
+{
+	struct ndctl_cmd *cmd;
+	int rc;
+
+	cmd = ndctl_dimm_cmd_new_ack_shutdown_count(dimm);
+	if (!cmd) {
+		fprintf(stderr, "%s: 'dirty-dimm' not supported\n",
+				ndctl_dimm_get_devname(dimm));
+		return -EOPNOTSUPP;
+	}
+
+	rc = ndctl_cmd_submit(cmd);
+	ndctl_cmd_unref(cmd);
+	return rc;
+}
+
 static struct json_object *dump_label_json(struct ndctl_dimm *dimm,
 		struct ndctl_cmd *cmd_read, ssize_t size)
 {
@@ -943,6 +960,11 @@ static const struct option update_options[] = {
 	OPT_END(),
 };
 
+static const struct option dirty_options[] = {
+	BASE_OPTIONS(),
+	OPT_END(),
+};
+
 static const struct option base_options[] = {
 	BASE_OPTIONS(),
 	OPT_END(),
@@ -1181,3 +1203,13 @@ int cmd_update_firmware(int argc, const char **argv, void *ctx)
 			count > 1 ? "s" : "");
 	return count >= 0 ? 0 : EXIT_FAILURE;
 }
+
+int cmd_dirty_dimm(int argc, const char **argv, void *ctx)
+{
+	int count = dimm_action(argc, argv, ctx, action_dirty, dirty_options,
+			"ndctl dirty-dimm <nmem0> [<nmem1>..<nmemN>] [<options>]");
+
+	fprintf(stderr, "dirtied %d nmem%s.\n", count >= 0 ? count : 0,
+			count > 1 ? "s" : "");
+	return count >= 0 ? 0 : EXIT_FAILURE;
+}
diff --git a/ndctl/ndctl.c b/ndctl/ndctl.c
index 73dabfac3908..93d0d88a274c 100644
--- a/ndctl/ndctl.c
+++ b/ndctl/ndctl.c
@@ -83,6 +83,7 @@ static struct cmd_struct commands[] = {
 	{ "write-labels", cmd_write_labels },
 	{ "init-labels", cmd_init_labels },
 	{ "check-labels", cmd_check_labels },
+	{ "dirty-dimm", cmd_dirty_dimm },
 	{ "inject-error", cmd_inject_error },
 	{ "update-firmware", cmd_update_firmware },
 	{ "inject-smart", cmd_inject_smart },

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