Add support for getting and setting BBU properties related to battery

relearning. Specifically, add subcommands to mfiutil(8) which allow the
user to set the BBU and autolearn modes when the firmware supports it,
and add a subcommand which kicks off a battery relearn.

Reviewed by:	sbruno, rstone
Tested by:	sbruno
Approved by:	rstone (co-mentor)
MFC after:	2 weeks
Sponsored by:	Sandvine Incorporated

7 files changed, 326 insertions, 4 deletions

diff --git a/usr.sbin/mfiutil/Makefile b/usr.sbin/mfiutil/Makefile
index e100358..c460b3f 100644
--- a/usr.sbin/mfiutil/Makefile
+++ b/usr.sbin/mfiutil/Makefile
@@ -1,8 +1,8 @@
 # $FreeBSD$
 PROG=	mfiutil
 
-SRCS=	mfiutil.c mfi_cmd.c mfi_config.c mfi_drive.c mfi_evt.c mfi_flash.c \
-	mfi_patrol.c mfi_show.c mfi_volume.c
+SRCS=	mfiutil.c mfi_bbu.c mfi_cmd.c mfi_config.c mfi_drive.c mfi_evt.c \
+	mfi_flash.c mfi_patrol.c mfi_show.c mfi_volume.c
 MAN8=	mfiutil.8
 
 CFLAGS+= -fno-builtin-strftime
diff --git a/usr.sbin/mfiutil/mfi_bbu.c b/usr.sbin/mfiutil/mfi_bbu.c
new file mode 100644
index 0000000..376258e
--- /dev/null
+++ b/usr.sbin/mfiutil/mfi_bbu.c
@@ -0,0 +1,252 @@
+/*-
+ * Copyright (c) 2013 Sandvine Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/errno.h>
+#include <sys/stat.h>
+#include <err.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include "mfiutil.h"
+
+/* The autolearn period is given in seconds. */
+void
+mfi_autolearn_period(uint32_t period, char *buf, size_t sz)
+{
+	unsigned int d, h;
+	char *tmp;
+
+	d = period / (24 * 3600);
+	h = (period % (24 * 3600)) / 3600;
+
+	tmp = buf;
+	if (d != 0) {
+		tmp += snprintf(buf, sz, "%u day%s", d, d == 1 ? "" : "s");
+		sz -= tmp - buf;
+		if (h != 0) {
+			tmp += snprintf(tmp, sz, ", ");
+			sz -= 2;
+		}
+	}
+	if (h != 0)
+		snprintf(tmp, sz, "%u hour%s", h, h == 1 ? "" : "s");
+
+	if (d == 0 && h == 0)
+		snprintf(tmp, sz, "less than 1 hour");
+}
+
+/* The time to the next relearn is given in seconds since 1/1/2000. */
+void
+mfi_next_learn_time(uint32_t next_learn_time, char *buf, size_t sz)
+{
+	time_t basetime;
+	struct tm tm;
+	size_t len;
+
+	memset(&tm, 0, sizeof(tm));
+	tm.tm_year = 100;
+	basetime = timegm(&tm);
+	basetime += (time_t)next_learn_time;
+	len = snprintf(buf, sz, "%s", ctime(&basetime));
+	if (len > 0)
+		/* Get rid of the newline added by ctime(3). */
+		buf[len - 1] = '\0';
+}
+
+void
+mfi_autolearn_mode(uint8_t mode, char *buf, size_t sz)
+{
+
+	switch (mode) {
+	case 0:
+		snprintf(buf, sz, "enabled");
+		break;
+	case 1:
+		snprintf(buf, sz, "disabled");
+		break;
+	case 2:
+		snprintf(buf, sz, "warn via event");
+		break;
+	default:
+		snprintf(buf, sz, "mode 0x%02x", mode);
+		break;
+	}
+}
+
+int
+mfi_bbu_get_props(int fd, struct mfi_bbu_properties *props, uint8_t *statusp)
+{
+
+	return (mfi_dcmd_command(fd, MFI_DCMD_BBU_GET_PROP, props,
+	    sizeof(*props), NULL, 0, statusp));
+}
+
+int
+mfi_bbu_set_props(int fd, struct mfi_bbu_properties *props, uint8_t *statusp)
+{
+
+	return (mfi_dcmd_command(fd, MFI_DCMD_BBU_SET_PROP, props,
+	    sizeof(*props), NULL, 0, statusp));
+}
+
+static int
+start_bbu_learn(int ac, char **av __unused)
+{
+	uint8_t status;
+	int error, fd;
+
+	status = MFI_STAT_OK;
+	error = 0;
+
+	if (ac != 1) {
+		warnx("start learn: unexpected arguments");
+		return (EINVAL);
+	}
+
+	fd = mfi_open(mfi_unit, O_RDWR);
+	if (fd < 0) {
+		error = errno;
+		warn("mfi_open");
+		return (error);
+	}
+
+	if (mfi_dcmd_command(fd, MFI_DCMD_BBU_START_LEARN, NULL, 0, NULL, 0,
+	    &status) < 0) {
+		error = errno;
+		warn("Failed to start BBU learn");
+	} else if (status != MFI_STAT_OK) {
+		warnx("Failed to start BBU learn: %s", mfi_status(status));
+		error = EIO;
+	}
+
+	return (error);
+}
+MFI_COMMAND(start, learn, start_bbu_learn);
+
+static int
+update_bbu_props(int ac, char **av)
+{
+	struct mfi_bbu_properties props;
+	unsigned long delay;
+	uint8_t status;
+	int error, fd;
+	char *mode, *endptr;
+
+	status = MFI_STAT_OK;
+	error = 0;
+
+	if (ac != 3) {
+		warnx("bbu: property and value required");
+		return (EINVAL);
+	}
+
+	fd = mfi_open(mfi_unit, O_RDWR);
+	if (fd < 0) {
+		error = errno;
+		warn("mfi_open");
+		return (error);
+	}
+
+	if (mfi_bbu_get_props(fd, &props, &status) < 0) {
+		error = errno;
+		warn("Failed to get BBU properties");
+		goto done;
+	} else if (status != MFI_STAT_OK) {
+		warnx("Failed to get BBU properties: %s", mfi_status(status));
+		error = EIO;
+		goto done;
+	}
+
+	if (strcmp(av[1], "learn-delay") == 0) {
+		delay = strtoul(av[2], &endptr, 10);
+		if (strlen(av[2]) == 0 || *endptr != '\0' || delay > 255) {
+			warnx("Invalid learn delay '%s'", av[2]);
+			error = EINVAL;
+			goto done;
+		}
+
+		props.learn_delay_interval = delay;
+	} else if (strcmp(av[1], "autolearn-mode") == 0) {
+		mode = av[2];
+
+		if (strcmp(av[2], "enable") == 0)
+			props.auto_learn_mode = 0;
+		else if (strcmp(av[2], "disable") == 0)
+			props.auto_learn_mode = 1;
+		else if (mode[0] >= '0' && mode[0] <= '2' && mode[1] == '\0')
+			props.auto_learn_mode = mode[0] - '0';
+		else {
+			warnx("Invalid mode '%s'", mode);
+			error = EINVAL;
+			goto done;
+		}
+	} else if (strcmp(av[1], "bbu-mode") == 0) {
+		if (props.bbu_mode == 0) {
+			warnx("This BBU does not implement different modes");
+			error = EINVAL;
+			goto done;
+		}
+
+		/* The mode must be an integer between 1 and 5. */
+		mode = av[2];
+		if (mode[0] < '1' || mode[0] > '5' || mode[1] != '\0') {
+			warnx("Invalid mode '%s'", mode);
+			error = EINVAL;
+			goto done;
+		}
+
+		props.bbu_mode = mode[0] - '0';
+	} else {
+		warnx("bbu: Invalid command '%s'", av[1]);
+		error = EINVAL;
+		goto done;
+	}
+
+	if (mfi_bbu_set_props(fd, &props, &status) < 0) {
+		error = errno;
+		warn("Failed to set BBU properties");
+		goto done;
+	} else if (status != MFI_STAT_OK) {
+		warnx("Failed to set BBU properties: %s", mfi_status(status));
+		error = EIO;
+		goto done;
+	}
+
+done:
+	close(fd);
+
+	return (error);
+}
+MFI_COMMAND(top, bbu, update_bbu_props);
diff --git a/usr.sbin/mfiutil/mfi_show.c b/usr.sbin/mfiutil/mfi_show.c
index be395bb..06721c2 100644
--- a/usr.sbin/mfiutil/mfi_show.c
+++ b/usr.sbin/mfiutil/mfi_show.c
@@ -140,9 +140,11 @@ show_battery(int ac, char **av __unused)
 {
 	struct mfi_bbu_capacity_info cap;
 	struct mfi_bbu_design_info design;
+	struct mfi_bbu_properties props;
 	struct mfi_bbu_status stat;
 	uint8_t status;
-	int comma, error, fd, show_capacity;
+	int comma, error, fd, show_capacity, show_props;
+	char buf[32];
 
 	if (ac != 1) {
 		warnx("show battery: extra arguments");
@@ -186,6 +188,14 @@ show_battery(int ac, char **av __unused)
 		return (error);
 	}
 
+	if (mfi_bbu_get_props(fd, &props, &status) < 0) {
+		error = errno;
+		warn("Failed to get properties");
+		close(fd);
+		return (error);
+	}
+	show_props = (status == MFI_STAT_OK);
+
 	printf("mfi%d: Battery State:\n", mfi_unit);
 	printf("     Manufacture Date: %d/%d/%d\n", design.mfg_date >> 5 & 0x0f,
 	    design.mfg_date & 0x1f, design.mfg_date >> 9 & 0xffff);
@@ -205,6 +215,23 @@ show_battery(int ac, char **av __unused)
 	printf("       Design Voltage: %d mV\n", design.design_voltage);
 	printf("      Current Voltage: %d mV\n", stat.voltage);
 	printf("          Temperature: %d C\n", stat.temperature);
+	if (show_props) {
+		mfi_autolearn_period(props.auto_learn_period, buf, sizeof(buf));
+		printf("     Autolearn period: %s\n", buf);
+		if (props.auto_learn_mode != 0)
+			snprintf(buf, sizeof(buf), "never");
+		else
+			mfi_next_learn_time(props.next_learn_time, buf,
+			    sizeof(buf));
+		printf("      Next learn time: %s\n", buf);
+		printf(" Learn delay interval: %u hour%s\n",
+		    props.learn_delay_interval,
+		    props.learn_delay_interval != 1 ? "s" : "");
+		mfi_autolearn_mode(props.auto_learn_mode, buf, sizeof(buf));
+		printf("       Autolearn mode: %s\n", buf);
+		if (props.bbu_mode != 0)
+			printf("             BBU Mode: %d\n", props.bbu_mode);
+	}
 	printf("               Status:");
 	comma = 0;
 	if (stat.fw_status & MFI_BBU_STATE_PACK_MISSING) {
diff --git a/usr.sbin/mfiutil/mfi_volume.c b/usr.sbin/mfiutil/mfi_volume.c
index 49417d0..2306256 100644
--- a/usr.sbin/mfiutil/mfi_volume.c
+++ b/usr.sbin/mfiutil/mfi_volume.c
@@ -363,7 +363,8 @@ volume_cache(int ac, char **av)
 			break;
 		}
 		if (props.default_cache_policy != props.current_cache_policy)
-			printf("Cache Disabled Due to Dead Battery\n");
+			printf(
+	"Cache disabled due to dead battery or ongoing battery relearn\n");
 		error = 0;
 	} else {
 		new = props;
diff --git a/usr.sbin/mfiutil/mfiutil.8 b/usr.sbin/mfiutil/mfiutil.8
index b1be5d9..5468617 100644
--- a/usr.sbin/mfiutil/mfiutil.8
+++ b/usr.sbin/mfiutil/mfiutil.8
@@ -141,6 +141,12 @@
 .Nm
 .Op Fl u Ar unit
 .Cm flash Ar file
+.Nm
+.Op Fl u Ar unit
+.Cm start learn
+.Nm
+.Op Fl u Ar unit
+.Cm bbu Ar setting Ar value
 .Sh DESCRIPTION
 The
 .Nm
@@ -565,6 +571,33 @@ Stop a currently running patrol read operation.
 Updates the flash on the controller with the firmware stored in
 .Ar file .
 A reboot is required for the new firmware to take effect.
+.It Cm start learn
+Start a battery relearn.
+.It Cm bbu Ar setting Ar value
+Update battery backup unit (BBU) properties related to battery relearning.
+The following settings are configurable:
+.Bl -tag -width indent
+.It Cm learn-delay
+Add a delay to the next scheduled battery relearn event. This setting is
+given in hours and must lie in the range of 0 to 255.
+.It Cm autolearn-mode
+Enable or disable automatic periodic battery relearning.
+The setting may be set to
+.Dq enable
+or
+.Dq disable
+to respectively enable or disable the relearn cycle.
+Alternatively, a mode of 0, 1 or 2 may be given.
+Mode 0 enables periodic relearning, mode 1 disables it, and mode 2 disables
+it and logs a warning to the event log when it detects that a battery relearn
+should be performed.
+.It Cm bbu-mode
+Set the BBU's mode of operation. This setting is not supported by all BBUs.
+Where it is supported, the possible values are the integers between 1 and 5
+inclusive.
+Modes 1, 2 and 3 enable a transparent learn cycle, whereas modes 4 and 5 do not.
+The BBU's data retention time is greater when transparent learning is not used.
+.El
 .El
 .Sh EXAMPLES
 Configure the cache for volume mfid0 to cache only writes:
diff --git a/usr.sbin/mfiutil/mfiutil.c b/usr.sbin/mfiutil/mfiutil.c
index 79c6a4b..7488e24 100644
--- a/usr.sbin/mfiutil/mfiutil.c
+++ b/usr.sbin/mfiutil/mfiutil.c
@@ -84,6 +84,8 @@ usage(void)
 	fprintf(stderr, "    start patrol              - start a patrol read\n");
 	fprintf(stderr, "    stop patrol               - stop a patrol read\n");
 	fprintf(stderr, "    flash <firmware>\n");
+	fprintf(stderr, "    start learn               - start a BBU relearn\n");
+	fprintf(stderr, "    bbu <setting> <value>     - set BBU properties\n");
 #ifdef DEBUG
 	fprintf(stderr, "    debug                     - debug 'show config'\n");
 	fprintf(stderr, "    dump                      - display 'saved' config\n");
diff --git a/usr.sbin/mfiutil/mfiutil.h b/usr.sbin/mfiutil/mfiutil.h
index 687bdd9..8a544c2 100644
--- a/usr.sbin/mfiutil/mfiutil.h
+++ b/usr.sbin/mfiutil/mfiutil.h
@@ -152,6 +152,13 @@ int	mfi_reconfig_supported(void);
 const char *mfi_status(u_int status_code);
 const char *mfi_drive_name(struct mfi_pd_info *pinfo, uint16_t device_id,
     uint32_t def);
+int	mfi_bbu_get_props(int fd, struct mfi_bbu_properties *props,
+	    uint8_t *statusp);
+int	mfi_bbu_set_props(int fd, struct mfi_bbu_properties *props,
+	    uint8_t *statusp);
+void	mfi_autolearn_period(uint32_t, char *, size_t);
+void	mfi_next_learn_time(uint32_t, char *, size_t);
+void	mfi_autolearn_mode(uint8_t, char *, size_t);
 
 void	scan_firmware(struct mfi_info_component *comp);
 void	display_firmware(struct mfi_info_component *comp, const char *tag);