Messages in this thread Patch in this message | | | From | ahaslam@baylibre ... | Subject | [PATCH v10 2/6] PM / Domains: core changes for multiple states | Date | Tue, 20 Oct 2015 15:26:25 +0200 |
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From: Axel Haslam <ahaslam+renesas@baylibre.com>
Add the core changes to be able to declare multiple states. When trying to set a power domain to off, genpd will be able to choose from an array of states declared by the platform. The power on and off latencies are now tied to a state.
States should be declared in ascending order from shallowest to deepest, deepest meaning the state which takes longer to enter and exit.
the power_off and power_on function can use the 'state_idx' field of the generic_pm_domain structure, to distinguish between the different states and act accordingly.
Example:
static int pd1_power_on(struct generic_pm_domain *domain) { /* domain->state_idx = state the domain is coming from */ }
static int pd1_power_off(struct generic_pm_domain *domain) { /* domain->state_idx = desired powered off state */ }
const struct genpd_power_state pd_states[] = { { .name = "RET", .power_on_latency_ns = ON_LATENCY_FAST, .power_off_latency_ns = OFF_LATENCY_FAST, }, { .name = "DEEP_RET", .power_on_latency_ns = ON_LATENCY_MED, .power_off_latency_ns = OFF_LATENCY_MED, }, { .name = "OFF", .power_on_latency_ns = ON_LATENCY_SLOW, .power_off_latency_ns = OFF_LATENCY_SLOW, } };
struct generic_pm_domain pd1 = { .name = "PD1", .power_on = pd1_power_on, .power_off = pd1_power_off, [...] };
int xxx_init_pm_domain(){
pm_genpd_init(struct generic_pm_domain, pd1, pd_states, ARRAY_SIZE(pd_states), true);
}
Signed-off-by: Axel Haslam <ahaslam+renesas@baylibre.com> --- drivers/base/power/domain.c | 141 +++++++++++++++++++++++++++++++++-- drivers/base/power/domain_governor.c | 13 +++- include/linux/pm_domain.h | 4 + 3 files changed, 149 insertions(+), 9 deletions(-)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index e0b5229..2ffee65 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -50,6 +50,12 @@ __retval; \ }) +#define GENPD_MAX_NAME_SIZE 20 + +static int pm_genpd_alloc_states_names(struct generic_pm_domain *genpd, + const struct genpd_power_state *st, + unsigned int st_count); + static LIST_HEAD(gpd_list); static DEFINE_MUTEX(gpd_list_lock); @@ -124,6 +130,7 @@ static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) static int genpd_power_on(struct generic_pm_domain *genpd, bool timed) { + unsigned int state_idx = genpd->state_idx; ktime_t time_start; s64 elapsed_ns; int ret; @@ -140,10 +147,10 @@ static int genpd_power_on(struct generic_pm_domain *genpd, bool timed) return ret; elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); - if (elapsed_ns <= genpd->power_on_latency_ns) + if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) return ret; - genpd->power_on_latency_ns = elapsed_ns; + genpd->states[state_idx].power_on_latency_ns = elapsed_ns; genpd->max_off_time_changed = true; pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", genpd->name, "on", elapsed_ns); @@ -153,6 +160,7 @@ static int genpd_power_on(struct generic_pm_domain *genpd, bool timed) static int genpd_power_off(struct generic_pm_domain *genpd, bool timed) { + unsigned int state_idx = genpd->state_idx; ktime_t time_start; s64 elapsed_ns; int ret; @@ -169,10 +177,10 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool timed) return ret; elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); - if (elapsed_ns <= genpd->power_off_latency_ns) + if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) return ret; - genpd->power_off_latency_ns = elapsed_ns; + genpd->states[state_idx].power_off_latency_ns = elapsed_ns; genpd->max_off_time_changed = true; pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", genpd->name, "off", elapsed_ns); @@ -576,6 +584,8 @@ static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd, || atomic_read(&genpd->sd_count) > 0) return; + /* Choose the deepest state when suspending */ + genpd->state_idx = genpd->state_count - 1; genpd_power_off(genpd, timed); genpd->status = GPD_STATE_POWER_OFF; @@ -1198,6 +1208,61 @@ static void genpd_free_dev_data(struct device *dev, dev_pm_put_subsys_data(dev); } +static int genpd_alloc_states_data(struct generic_pm_domain *genpd, + const struct genpd_power_state *st, + unsigned int st_count) +{ + int ret = 0; + unsigned int i; + + if (IS_ERR_OR_NULL(genpd)) { + ret = -EINVAL; + goto err; + } + + if (!st || (st_count < 1)) { + ret = -EINVAL; + goto err; + } + + /* Allocate the local memory to keep the states for this genpd */ + genpd->states = kcalloc(st_count, sizeof(*st), GFP_KERNEL); + if (!genpd->states) { + ret = -ENOMEM; + goto err; + } + + for (i = 0; i < st_count; i++) { + genpd->states[i].power_on_latency_ns = + st[i].power_on_latency_ns; + genpd->states[i].power_off_latency_ns = + st[i].power_off_latency_ns; + } + + /* + * Copy the latency values To keep compatibility with + * platforms that are not converted to use the multiple states. + * This will be removed once all platforms are converted to use + * multiple states. note that non converted platforms will use the + * default single off state. + */ + if (genpd->power_on_latency_ns != 0) + genpd->states[0].power_on_latency_ns = + genpd->power_on_latency_ns; + + if (genpd->power_off_latency_ns != 0) + genpd->states[0].power_off_latency_ns = + genpd->power_off_latency_ns; + + genpd->state_count = st_count; + + /* to save memory, Name allocation will happen if debug is enabled */ + pm_genpd_alloc_states_names(genpd, st, st_count); + +err: + return ret; +} + /** * __pm_genpd_add_device - Add a device to an I/O PM domain. * @genpd: PM domain to add the device to. @@ -1456,9 +1521,23 @@ void pm_genpd_init(struct generic_pm_domain *genpd, const struct genpd_power_state *states, unsigned int state_count, bool is_off) { + int ret; + if (IS_ERR_OR_NULL(genpd)) return; + /* State data should be provided */ + if (!states || (state_count < 1)) { + pr_err("Invalid state data\n"); + return; + } + + ret = genpd_alloc_states_data(genpd, states, state_count); + if (ret) { + pr_err("Failed to allocate states for %s\n", genpd->name); + return; + } + INIT_LIST_HEAD(&genpd->master_links); INIT_LIST_HEAD(&genpd->slave_links); INIT_LIST_HEAD(&genpd->dev_list); @@ -1470,6 +1549,8 @@ void pm_genpd_init(struct generic_pm_domain *genpd, genpd->device_count = 0; genpd->max_off_time_ns = -1; genpd->max_off_time_changed = true; + /* Assume the deepest state on init*/ + genpd->state_idx = genpd->state_count - 1; genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; genpd->domain.ops.prepare = pm_genpd_prepare; @@ -1515,7 +1596,16 @@ EXPORT_SYMBOL_GPL(pm_genpd_init); void pm_genpd_init_simple(struct generic_pm_domain *genpd, struct dev_power_governor *gov, bool is_off) { - pm_genpd_init(genpd, gov, NULL, 0, is_off); + static const struct genpd_power_state genpd_default_idle_states[] = { + { + .name = "OFF", + .power_off_latency_ns = 0, + .power_on_latency_ns = 0, + }, + }; + + pm_genpd_init(genpd, gov, genpd_default_idle_states, + ARRAY_SIZE(genpd_default_idle_states), is_off); } EXPORT_SYMBOL_GPL(pm_genpd_init_simple); @@ -1832,6 +1922,33 @@ EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); #include <linux/kobject.h> static struct dentry *pm_genpd_debugfs_dir; +static int pm_genpd_alloc_states_names(struct generic_pm_domain *genpd, + const struct genpd_power_state *st, + unsigned int st_count) +{ + unsigned int i; + + if (IS_ERR_OR_NULL(genpd)) + return -EINVAL; + + if (genpd->state_count != st_count) { + pr_err("Invalid allocated state count\n"); + return -EINVAL; + } + + for (i = 0; i < st_count; i++) { + genpd->states[i].name = kstrndup(st[i].name, + GENPD_MAX_NAME_SIZE, GFP_KERNEL); + if (!genpd->states[i].name) { + pr_err("%s Failed to allocate state %d name.\n", + genpd->name, i); + return -ENOMEM; + } + } + + return 0; +} + /* * TODO: This function is a slightly modified version of rtpm_status_show * from sysfs.c, so generalize it. @@ -1865,6 +1982,7 @@ static int pm_genpd_summary_one(struct seq_file *s, [GPD_STATE_ACTIVE] = "on", [GPD_STATE_POWER_OFF] = "off" }; + unsigned int state_idx = genpd->state_idx; struct pm_domain_data *pm_data; const char *kobj_path; struct gpd_link *link; @@ -1876,7 +1994,11 @@ static int pm_genpd_summary_one(struct seq_file *s, if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) goto exit; - seq_printf(s, "%-30s %-15s ", genpd->name, status_lookup[genpd->status]); + + seq_printf(s, "%-30s %-15s ", genpd->name, + (genpd->status == GPD_STATE_POWER_OFF) ? + genpd->states[state_idx].name : + status_lookup[genpd->status]); /* * Modifications on the list require holding locks on both @@ -1964,4 +2086,11 @@ static void __exit pm_genpd_debug_exit(void) debugfs_remove_recursive(pm_genpd_debugfs_dir); } __exitcall(pm_genpd_debug_exit); +#else +static inline int pm_genpd_alloc_states_names(struct generic_pm_domain *genpd, + const struct genpd_power_state *st, + unsigned int st_count) +{ + return 0; +} #endif /* CONFIG_PM_ADVANCED_DEBUG */ diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c index 85e17ba..bf3ac68 100644 --- a/drivers/base/power/domain_governor.c +++ b/drivers/base/power/domain_governor.c @@ -127,8 +127,12 @@ static bool default_power_down_ok(struct dev_pm_domain *pd) return genpd->cached_power_down_ok; } - off_on_time_ns = genpd->power_off_latency_ns + - genpd->power_on_latency_ns; + /* + * Use the only available state, until multiple state support is added + * to the governor. + */ + off_on_time_ns = genpd->states[0].power_off_latency_ns + + genpd->states[0].power_on_latency_ns; min_off_time_ns = -1; /* @@ -205,8 +209,11 @@ static bool default_power_down_ok(struct dev_pm_domain *pd) * The difference between the computed minimum subdomain or device off * time and the time needed to turn the domain on is the maximum * theoretical time this domain can spend in the "off" state. + * Use the only available state, until multiple state support is added + * to the governor. */ - genpd->max_off_time_ns = min_off_time_ns - genpd->power_on_latency_ns; + genpd->max_off_time_ns = min_off_time_ns - + genpd->states[0].power_on_latency_ns; return true; } diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index f37faec..3129f85 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -77,6 +77,10 @@ struct generic_pm_domain { void (*detach_dev)(struct generic_pm_domain *domain, struct device *dev); unsigned int flags; /* Bit field of configs for genpd */ + struct genpd_power_state *states; + unsigned int state_count; /* number of states */ + unsigned int state_idx; /* state that genpd will go to when off */ + }; static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd) -- 2.4.5
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