From 4e4fa398db69e22dcad23114eb7e33b4d89b10c4 Mon Sep 17 00:00:00 2001 From: Jan Kiszka Date: Mon, 23 Jan 2012 20:15:11 +0100 Subject: qdev: Introduce lost tick policy property Potentially tick-generating timer devices will gain a common property: lock_tick_policy. It allows to encode 4 different ways how to deal with tick events the guest did not process in time: discard - ignore lost ticks (e.g. if the guest compensates for them already) delay - replay all lost ticks in a row once the guest accepts them again merge - if multiple ticks are lost, all of them are merged into one which is replayed once the guest accepts it again slew - lost ticks are gradually replayed at a higher frequency than the original tick Not all timer device will need to support all modes. However, all need to accept the configuration via this common property. Signed-off-by: Jan Kiszka Signed-off-by: Anthony Liguori --- hw/qdev-properties.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) (limited to 'hw/qdev-properties.c') diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c index c98219ad26..028bee7da6 100644 --- a/hw/qdev-properties.c +++ b/hw/qdev-properties.c @@ -885,6 +885,55 @@ PropertyInfo qdev_prop_macaddr = { .set = set_generic, }; + +/* --- lost tick policy --- */ + +static const struct { + const char *name; + LostTickPolicy code; +} lost_tick_policy_table[] = { + { .name = "discard", .code = LOST_TICK_DISCARD }, + { .name = "delay", .code = LOST_TICK_DELAY }, + { .name = "merge", .code = LOST_TICK_MERGE }, + { .name = "slew", .code = LOST_TICK_SLEW }, +}; + +static int parse_lost_tick_policy(DeviceState *dev, Property *prop, + const char *str) +{ + LostTickPolicy *ptr = qdev_get_prop_ptr(dev, prop); + int i; + + for (i = 0; i < ARRAY_SIZE(lost_tick_policy_table); i++) { + if (!strcasecmp(str, lost_tick_policy_table[i].name)) { + *ptr = lost_tick_policy_table[i].code; + break; + } + } + if (i == ARRAY_SIZE(lost_tick_policy_table)) { + return -EINVAL; + } + return 0; +} + +static int print_lost_tick_policy(DeviceState *dev, Property *prop, char *dest, + size_t len) +{ + LostTickPolicy *ptr = qdev_get_prop_ptr(dev, prop); + + return snprintf(dest, len, "%s", lost_tick_policy_table[*ptr].name); +} + +PropertyInfo qdev_prop_losttickpolicy = { + .name = "lost_tick_policy", + .type = PROP_TYPE_LOSTTICKPOLICY, + .size = sizeof(LostTickPolicy), + .parse = parse_lost_tick_policy, + .print = print_lost_tick_policy, + .get = get_generic, + .set = set_generic, +}; + /* --- pci address --- */ /* @@ -1127,6 +1176,12 @@ void qdev_prop_set_macaddr(DeviceState *dev, const char *name, uint8_t *value) qdev_prop_set(dev, name, value, PROP_TYPE_MACADDR); } +void qdev_prop_set_losttickpolicy(DeviceState *dev, const char *name, + LostTickPolicy *value) +{ + qdev_prop_set(dev, name, value, PROP_TYPE_LOSTTICKPOLICY); +} + void qdev_prop_set_ptr(DeviceState *dev, const char *name, void *value) { qdev_prop_set(dev, name, &value, PROP_TYPE_PTR); -- cgit v1.2.3