# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1224757045 -3600
# Node ID 635a9691a8a9e9793312dc61184624a6d2e6b285
# Parent 10d338e5f741f813ea5b3335c405e9a57d55f535
Xen power management daemon patch.
Signed-off-by: Kamala Narasimhan <kamala.narasimhan@xxxxxxxxxx>
---
tools/Makefile | 1
tools/xenpmd/Makefile | 15 +
tools/xenpmd/xenpmd.c | 520 ++++++++++++++++++++++++++++++++++++++++++++++++++
xenpmd/xenpmd | 0
4 files changed, 536 insertions(+)
diff -r 10d338e5f741 -r 635a9691a8a9 tools/Makefile
--- a/tools/Makefile Wed Oct 22 16:47:44 2008 +0100
+++ b/tools/Makefile Thu Oct 23 11:17:25 2008 +0100
@@ -24,6 +24,7 @@ SUBDIRS-$(LIBXENAPI_BINDINGS) += libxen
SUBDIRS-$(LIBXENAPI_BINDINGS) += libxen
SUBDIRS-y += fs-back
SUBDIRS-$(CONFIG_IOEMU) += ioemu-dir
+SUBDIRS-y += xenpmd
# These don't cross-compile
ifeq ($(XEN_COMPILE_ARCH),$(XEN_TARGET_ARCH))
diff -r 10d338e5f741 -r 635a9691a8a9 tools/xenpmd/Makefile
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/xenpmd/Makefile Thu Oct 23 11:17:25 2008 +0100
@@ -0,0 +1,15 @@
+XEN_ROOT=../..
+include $(XEN_ROOT)/tools/Rules.mk
+
+CFLAGS += -Werror
+CFLAGS += $(CFLAGS_libxenstore)
+LDFLAGS += $(LDFLAGS_libxenstore)
+
+BIN = xenpmd
+
+.PHONY: all
+all: $(BIN)
+
+.PHONY: clean
+clean:
+ $(RM) -f $(BIN)
diff -r 10d338e5f741 -r 635a9691a8a9 tools/xenpmd/xenpmd
Binary file tools/xenpmd/xenpmd has changed
diff -r 10d338e5f741 -r 635a9691a8a9 tools/xenpmd/xenpmd.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/xenpmd/xenpmd.c Thu Oct 23 11:17:25 2008 +0100
@@ -0,0 +1,520 @@
+/*
+ * xenpmd.c
+ *
+ * xen power management daemon - Facilitates power management
+ * functionality within xen guests.
+ *
+ * Copyright (c) 2008 Kamala Narasimhan
+ * Copyright (c) 2008 Citrix Systems, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/* Xen extended power management support provides HVM guest power management
+ * features beyond S3, S4, S5. For example, it helps expose system level
+ * battery status and battery meter information and in future will be extended
+ * to include more power management support. This extended power management
+ * support is enabled by setting xen_extended_power_mgmt to 1 or 2 in the HVM
+ * config file. When set to 2, non-pass through mode is enabled which heavily
+ * relies on this power management daemon to glean battery information from
+ * dom0 and store it xenstore which would then be queries and used by qemu and
+ * passed to the guest when appropriate battery ports are read/written to.
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <xs.h>
+
+/* #define RUN_STANDALONE */
+#define RUN_IN_SIMULATE_MODE
+
+enum BATTERY_INFO_TYPE {
+ BIF,
+ BST
+};
+
+enum BATTERY_PRESENT {
+ NO,
+ YES
+};
+
+enum BATTERY_TECHNOLOGY {
+ NON_RECHARGEABLE,
+ RECHARGEABLE
+};
+
+struct battery_info {
+ enum BATTERY_PRESENT present;
+ unsigned long design_capacity;
+ unsigned long last_full_capacity;
+ enum BATTERY_TECHNOLOGY battery_technology;
+ unsigned long design_voltage;
+ unsigned long design_capacity_warning;
+ unsigned long design_capacity_low;
+ unsigned long capacity_granularity_1;
+ unsigned long capacity_granularity_2;
+ char model_number[32];
+ char serial_number[32];
+ char battery_type[32];
+ char oem_info[32];
+};
+
+struct battery_status {
+ enum BATTERY_PRESENT present;
+ unsigned long state;
+ unsigned long present_rate;
+ unsigned long remaining_capacity;
+ unsigned long present_voltage;
+};
+
+static struct xs_handle *xs;
+
+#ifdef RUN_IN_SIMULATE_MODE
+ #define BATTERY_DIR_PATH "/tmp/battery"
+ #define BATTERY_INFO_FILE_PATH "/tmp/battery/%s/info"
+ #define BATTERY_STATE_FILE_PATH "/tmp/battery/%s/state"
+#else
+ #define BATTERY_DIR_PATH "/proc/acpi/battery"
+ #define BATTERY_INFO_FILE_PATH "/proc/acpi/battery/%s/info"
+ #define BATTERY_STATE_FILE_PATH "/proc/acpi/battery/%s/state"
+#endif
+
+FILE *get_next_battery_file(DIR *battery_dir,
+ enum BATTERY_INFO_TYPE battery_info_type)
+{
+ FILE *file = 0;
+ struct dirent *dir_entries;
+ char file_name[32];
+
+ do
+ {
+ dir_entries = readdir(battery_dir);
+ if ( !dir_entries )
+ return 0;
+ if ( strlen(dir_entries->d_name) < 4 )
+ continue;
+ if ( battery_info_type == BIF )
+ snprintf(file_name, 32, BATTERY_INFO_FILE_PATH,
+ dir_entries->d_name);
+ else
+ snprintf(file_name, 32, BATTERY_STATE_FILE_PATH,
+ dir_entries->d_name);
+ file = fopen(file_name, "r");
+ } while ( !file );
+
+ return file;
+}
+
+void set_attribute_battery_info(char *attrib_name,
+ char *attrib_value,
+ struct battery_info *info)
+{
+ if ( strstr(attrib_name, "present") )
+ {
+ if ( strstr(attrib_value, "yes") )
+ info->present = YES;
+ return;
+ }
+
+ if ( strstr(attrib_name, "design capacity warning") )
+ {
+ info->design_capacity_warning = strtoull(attrib_value, NULL, 10);
+ return;
+ }
+
+ if ( strstr(attrib_name, "design capacity low") )
+ {
+ info->design_capacity_low = strtoull(attrib_value, NULL, 10);
+ return;
+ }
+
+ if ( strstr(attrib_name, "design capacity") )
+ {
+ info->design_capacity = strtoull(attrib_value, NULL, 10);
+ return;
+ }
+
+ if ( strstr(attrib_name, "last full capacity") )
+ {
+ info->last_full_capacity = strtoull(attrib_value, NULL, 10);
+ return;
+ }
+
+ if ( strstr(attrib_name, "design voltage") )
+ {
+ info->design_voltage = strtoull(attrib_value, NULL, 10);
+ return;
+ }
+
+ if ( strstr(attrib_name, "capacity granularity 1") )
+ {
+ info->capacity_granularity_1 = strtoull(attrib_value, NULL, 10);
+ return;
+ }
+
+ if ( strstr(attrib_name, "capacity granularity 2") )
+ {
+ info->capacity_granularity_2 = strtoull(attrib_value, NULL, 10);
+ return;
+ }
+
+ if ( strstr(attrib_name, "battery technology") )
+ {
+ if ( strncmp(attrib_value, "rechargeable",
+ strlen("rechargeable")) == 0 )
+ info->battery_technology = RECHARGEABLE;
+ else
+ info->battery_technology = NON_RECHARGEABLE;
+ return;
+ }
+
+ if ( strstr(attrib_name, "model number") )
+ {
+ strncpy(info->model_number, attrib_value, 32);
+ return;
+ }
+
+ if ( strstr(attrib_name, "serial number") )
+ {
+ strncpy(info->serial_number, attrib_value, 32);
+ return;
+ }
+
+ if ( strstr(attrib_name, "battery type") )
+ {
+ strncpy(info->battery_type, attrib_value, 32);
+ return;
+ }
+
+ if ( strstr(attrib_name, "OEM info") )
+ {
+ strncpy(info->oem_info, attrib_value, 32);
+ return;
+ }
+
+ return;
+}
+
+void set_attribute_battery_status(char *attrib_name,
+ char *attrib_value,
+ struct battery_status *status)
+{
+ if ( strstr(attrib_name, "charging state") )
+ {
+ /* Check this, below is half baked */
+ if ( strstr(attrib_value, "charged") )
+ status->state = 0;
+ else
+ status->state = 1;
+ return;
+ }
+
+ if ( strstr(attrib_name, "present rate") )
+ {
+ status->present_rate = strtoull(attrib_value, NULL, 10);
+ return;
+ }
+
+ if ( strstr(attrib_name, "remaining capacity") )
+ {
+ status->remaining_capacity = strtoull(attrib_value, NULL, 10);
+ return;
+ }
+
+ if ( strstr(attrib_name, "present voltage") )
+ {
+ status->present_voltage = strtoull(attrib_value, NULL, 10);
+ return;
+ }
+
+ if ( strstr(attrib_name, "present") )
+ {
+ if ( strstr(attrib_value, "yes") )
+ status->present = YES;
+ return;
+ }
+}
+
+void parse_battery_info_or_status(char *line_info,
+ enum BATTERY_INFO_TYPE type,
+ void *info_or_status)
+{
+ char attrib_name[128];
+ char attrib_value[64];
+ char *delimiter;
+ unsigned long length;
+
+ length = strlen(line_info);
+ delimiter = (char *) strchr( line_info, ':');
+ if ( (!delimiter) || (delimiter == line_info) ||
+ (delimiter == line_info + length) )
+ return;
+
+ strncpy(attrib_name, line_info, delimiter-line_info);
+ while ( *(delimiter+1) == ' ' )
+ {
+ delimiter++;
+ if ( delimiter+1 == line_info + length)
+ return;
+ }
+ strncpy(attrib_value, delimiter+1,
+ (unsigned long)line_info + length -(unsigned long)delimiter);
+
+ if ( type == BIF )
+ set_attribute_battery_info(attrib_name, attrib_value,
+ (struct battery_info *)info_or_status);
+ else
+ set_attribute_battery_status(attrib_name, attrib_value,
+ (struct battery_status *)info_or_status);
+
+ return;
+}
+
+int get_next_battery_info_or_status(DIR *battery_dir,
+ enum BATTERY_INFO_TYPE type,
+ void *info_or_status)
+{
+ FILE *file;
+ char line_info[256];
+
+ if ( !info_or_status )
+ return 0;
+
+ memset(line_info, 0, 256);
+ if (type == BIF)
+ memset(info_or_status, 0, sizeof(struct battery_info));
+ else
+ memset(info_or_status, 0, sizeof(struct battery_status));
+
+ file = get_next_battery_file(battery_dir, type);
+ if ( !file )
+ return 0;
+
+ while ( fgets(line_info, 1024, file) != NULL )
+ {
+ parse_battery_info_or_status(line_info, type, info_or_status);
+ memset(line_info, 0, 256);
+ }
+
+ fclose(file);
+ return 1;
+}
+
+#ifdef RUN_STANDALONE
+void print_battery_info(struct battery_info *info)
+{
+ printf("present: %d\n", info->present);
+ printf("design capacity: %d\n", info->design_capacity);
+ printf("last full capacity: %d\n", info->last_full_capacity);
+ printf("battery technology: %d\n", info->battery_technology);
+ printf("design voltage: %d\n", info->design_voltage);
+ printf("design capacity warning:%d\n", info->design_capacity_warning);
+ printf("design capacity low: %d\n", info->design_capacity_low);
+ printf("capacity granularity 1: %d\n", info->capacity_granularity_1);
+ printf("capacity granularity 2: %d\n", info->capacity_granularity_2);
+ printf("model number: %s\n", info->model_number);
+ printf("serial number: %s\n", info->serial_number);
+ printf("battery type: %s\n", info->battery_type);
+ printf("OEM info: %s\n", info->oem_info);
+}
+#endif /*RUN_STANDALONE*/
+
+void write_ulong_lsb_first(char *temp_val, unsigned long val)
+{
+ snprintf(temp_val, 9, "%02x%02x%02x%02x", (unsigned int)val & 0xff,
+ (unsigned int)(val & 0xff00) >> 8, (unsigned int)(val & 0xff0000) >> 16,
+ (unsigned int)(val & 0xff000000) >> 24);
+}
+
+void write_battery_info_to_xenstore(struct battery_info *info)
+{
+ char val[1024], string_info[256];
+
+ xs_mkdir(xs, XBT_NULL, "/pm");
+
+ memset(val, 0, 1024);
+ memset(string_info, 0, 256);
+ /* write 9 dwords (so 9*4) + length of 4 strings + 4 null terminators */
+ snprintf(val, 3, "%02x",
+ (unsigned int)(9*4 +
+ strlen(info->model_number) +
+ strlen(info->serial_number) +
+ strlen(info->battery_type) +
+ strlen(info->oem_info) + 4));
+ write_ulong_lsb_first(val+2, info->present);
+ write_ulong_lsb_first(val+10, info->design_capacity);
+ write_ulong_lsb_first(val+18, info->last_full_capacity);
+ write_ulong_lsb_first(val+26, info->battery_technology);
+ write_ulong_lsb_first(val+34, info->design_voltage);
+ write_ulong_lsb_first(val+42, info->design_capacity_warning);
+ write_ulong_lsb_first(val+50, info->design_capacity_low);
+ write_ulong_lsb_first(val+58, info->capacity_granularity_1);
+ write_ulong_lsb_first(val+66, info->capacity_granularity_2);
+
+ snprintf(string_info, 256, "%02x%s%02x%s%02x%s%02x%s",
+ (unsigned int)strlen(info->model_number), info->model_number,
+ (unsigned int)strlen(info->serial_number), info->serial_number,
+ (unsigned int)strlen(info->battery_type), info->battery_type,
+ (unsigned int)strlen(info->oem_info), info->oem_info);
+ strncat(val+73, string_info, 1024);
+ xs_write(xs, XBT_NULL, "/pm/bif",
+ val, 73+8+strlen(info->model_number)+strlen(info->serial_number)+
+ strlen(info->battery_type)+strlen(info->oem_info)+1);
+}
+
+int write_one_time_battery_info(void)
+{
+ DIR *dir;
+ int ret = 0;
+ struct battery_info info;
+
+ dir = opendir(BATTERY_DIR_PATH);
+ if ( !dir )
+ return 0;
+
+ while ( get_next_battery_info_or_status(dir, BIF, (void *)&info) )
+ {
+#ifdef RUN_STANDALONE
+ print_battery_info(&info);
+#endif
+ if ( info.present == YES )
+ {
+ write_battery_info_to_xenstore(&info);
+ ret = 1;
+ break; /* rethink this... */
+ }
+ }
+
+ closedir(dir);
+ return ret;
+}
+
+#ifdef RUN_STANDALONE
+void print_battery_status(struct battery_status *status)
+{
+ printf("present: %d\n", status->present);
+ printf("Battery state %d\n", status->state);
+ printf("Battery present rate %d\n", status->present_rate);
+ printf("Battery remining capacity %d\n", status->remaining_capacity);
+ printf("Battery present voltage %d\n", status->present_voltage);
+}
+#endif /*RUN_STANDALONE*/
+
+void write_battery_status_to_xenstore(struct battery_status *status)
+{
+ char val[35];
+
+ xs_mkdir(xs, XBT_NULL, "/pm");
+
+ memset(val, 0, 35);
+ snprintf(val, 3, "%02x", 16);
+ write_ulong_lsb_first(val+2, status->state);
+ write_ulong_lsb_first(val+10, status->present_rate);
+ write_ulong_lsb_first(val+18, status->remaining_capacity);
+ write_ulong_lsb_first(val+26, status->present_voltage);
+
+ xs_write(xs, XBT_NULL, "/pm/bst", val, 35);
+}
+
+int wait_for_and_update_battery_status_request(void)
+{
+ DIR *dir;
+ int ret = 0;
+ unsigned int count;
+ struct battery_status status;
+
+ while ( true )
+ {
+ /* KN:@TODO - It is rather inefficient to not cache the file handle.
+ * Switch to caching file handle.
+ */
+ dir = opendir(BATTERY_DIR_PATH);
+ if ( !dir )
+ return 0;
+
+ while ( get_next_battery_info_or_status(dir, BST, (void *)&status) )
+ {
+#ifdef RUN_STANDALONE
+ print_battery_status(&status);
+#endif
+ if ( status.present == YES )
+ {
+ write_battery_status_to_xenstore(&status);
+ ret = 1;
+ /* rethink this; though I have never seen, there might be
+ * systems out there with more than one battery device
+ * present
+ */
+ break;
+ }
+ }
+ closedir(dir);
+ xs_watch(xs, "/pm/events", "refreshbatterystatus");
+ xs_read_watch(xs, &count);
+ }
+
+ return ret;
+}
+
+/* Borrowed daemonize from xenstored - Initially written by Stevens. */
+static void daemonize(void)
+{
+ pid_t pid;
+
+ if ( (pid = fork()) < 0 )
+ exit(1);
+
+ if ( pid != 0 )
+ exit(0);
+
+ setsid();
+
+ if ( (pid = fork()) < 0 )
+ exit(1);
+
+ if ( pid != 0 )
+ exit(0);
+
+ if ( chdir("/") == -1 )
+ exit(1);
+
+ umask(0);
+}
+
+int main(int argc, char *argv[])
+{
+#ifndef RUN_STANDALONE
+ daemonize();
+#endif
+ xs = (struct xs_handle *)xs_daemon_open();
+ if ( xs == NULL )
+ return -1;
+
+ if ( write_one_time_battery_info() == 0 )
+ {
+ xs_daemon_close(xs);
+ return -1;
+ }
+
+ wait_for_and_update_battery_status_request();
+ xs_daemon_close(xs);
+ return 0;
+}
+
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