The thermal framework initialization with the device tree appears to
be complicated and hard to make it to evolve.
It contains duplication of almost the same thermal generic structures
and has an assymetric initialization making hard any kind of serious
changes for more complex features. One of them is the multiple sensors
support per thermal zone.
In order to set the scene for the aforementioned feature with generic
code, we need to cleanup and rework the device tree initialization.
However this rework is not obvious because of the multiple components
entering in the composition of a thermal zone and being initialized at
different moments. For instance, a cooling device can be initialized
before a sensor, so the thermal zones must exist before the cooling
device as well as the sensor. This asynchronous initialization forces
the thermal zone to be created with fake ops because they are
mandotory and build a list of cooling devices which is used to lookup
afterwards when the cooling device driver is registering itself.
As there could be a large number of changes, this first series provide
some steps forward for a simpler device tree initialization.
More series for cleanup and code duplication removal will follow.
Changelog:
- v6:
- Folded patches 8, 9, 10
- Removed thermal_zone_get_trips() and thermal_zone_get_num_trips()
- Moved tz->ntrips => tz->num_trips changes into patch 11 to fix the
git bisecting
- v5:
- Remove extra of_node_put() reported by lkp
- V4:
- Added of_node_put(trips)
- Changed naming 'ntrips' -> 'num_trips'
- Updated documentation for added and renamed fields in the thermal
zone structure
- Fixed bad parameter type 'thermal_zone' -> 'thermal_zone_device'
- Clarified there is more cleanups coming in the changelog
- Put 'trips' and 'num_trips' fields all together
- Made git-bisect safe the series
- V3:
- Removed patch 1 and 2 from the V2 which consist in renaming the
thermal_zone_device_ops to thermal_sensor_ops and separating the
structure. I'll do a separate proposal for that after the incoming
cleanups
- V2:
- Drop patch 1/15 which contains too many changes for a simple
structure renaming. This could be addressed in a separate series as
it is not necessary for the OF rework
- Fixed of_node_put with gchild not initialized as reported by
kbuild and Dan Carpenter
- V1:
- Initial post
Daniel Lezcano (10):
thermal/core: Remove duplicate information when an error occurs
thermal/of: Replace device node match with device node search
thermal/of: Remove the device node pointer for thermal_trip
thermal/of: Move thermal_trip structure to thermal.h
thermal/core: Remove unneeded EXPORT_SYMBOLS
thermal/core: Move thermal_set_delay_jiffies to static
thermal/core: Rename 'trips' to 'num_trips'
thermal/core: Add thermal_trip in thermal_zone
thermal/of: Use thermal trips stored in the thermal zone
thermal/of: Initialize trip points separately
drivers/thermal/gov_fair_share.c | 6 +-
drivers/thermal/gov_power_allocator.c | 4 +-
drivers/thermal/tegra/tegra30-tsensor.c | 2 +-
drivers/thermal/thermal_core.c | 53 +++++--
drivers/thermal/thermal_core.h | 15 --
drivers/thermal/thermal_helpers.c | 13 +-
drivers/thermal/thermal_netlink.c | 2 +-
drivers/thermal/thermal_of.c | 201 +++++++++++++-----------
drivers/thermal/thermal_sysfs.c | 22 +--
include/linux/thermal.h | 24 ++-
10 files changed, 189 insertions(+), 153 deletions(-)
--
2.25.1
Different functions are exporting the symbols but are actually only
used by the thermal framework internals. Remove these EXPORT_SYMBOLS.
Cc: Alexandre Bailon <[email protected]>
Cc: Kevin Hilman <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
---
drivers/thermal/thermal_helpers.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/thermal/thermal_helpers.c b/drivers/thermal/thermal_helpers.c
index 3edd047e144f..f4c1e87ef040 100644
--- a/drivers/thermal/thermal_helpers.c
+++ b/drivers/thermal/thermal_helpers.c
@@ -39,7 +39,6 @@ int get_tz_trend(struct thermal_zone_device *tz, int trip)
return trend;
}
-EXPORT_SYMBOL(get_tz_trend);
struct thermal_instance *
get_thermal_instance(struct thermal_zone_device *tz,
@@ -228,7 +227,6 @@ void thermal_cdev_update(struct thermal_cooling_device *cdev)
}
mutex_unlock(&cdev->lock);
}
-EXPORT_SYMBOL(thermal_cdev_update);
/**
* thermal_zone_get_slope - return the slope attribute of the thermal zone
--
2.25.1
The function 'thermal_set_delay_jiffies' is only used in
thermal_core.c but it is defined and implemented in a separate
file. Move the function to thermal_core.c and make it static.
Cc: Alexandre Bailon <[email protected]>
Cc: Kevin Hilman <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Reviewed-by: Lukasz Luba <[email protected]>
---
drivers/thermal/thermal_core.c | 7 +++++++
drivers/thermal/thermal_core.h | 1 -
drivers/thermal/thermal_helpers.c | 7 -------
3 files changed, 7 insertions(+), 8 deletions(-)
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index e22e7d939c54..a8b1628937c6 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1159,6 +1159,13 @@ static void bind_tz(struct thermal_zone_device *tz)
mutex_unlock(&thermal_list_lock);
}
+static void thermal_set_delay_jiffies(unsigned long *delay_jiffies, int delay_ms)
+{
+ *delay_jiffies = msecs_to_jiffies(delay_ms);
+ if (delay_ms > 1000)
+ *delay_jiffies = round_jiffies(*delay_jiffies);
+}
+
/**
* thermal_zone_device_register() - register a new thermal zone device
* @type: the thermal zone device type
diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h
index 60844e2d59bb..c991bb290512 100644
--- a/drivers/thermal/thermal_core.h
+++ b/drivers/thermal/thermal_core.h
@@ -112,7 +112,6 @@ int thermal_build_list_of_policies(char *buf);
/* Helpers */
void thermal_zone_set_trips(struct thermal_zone_device *tz);
-void thermal_set_delay_jiffies(unsigned long *delay_jiffies, int delay_ms);
/* sysfs I/F */
int thermal_zone_create_device_groups(struct thermal_zone_device *, int);
diff --git a/drivers/thermal/thermal_helpers.c b/drivers/thermal/thermal_helpers.c
index f4c1e87ef040..60bfda1a1db7 100644
--- a/drivers/thermal/thermal_helpers.c
+++ b/drivers/thermal/thermal_helpers.c
@@ -174,13 +174,6 @@ void thermal_zone_set_trips(struct thermal_zone_device *tz)
mutex_unlock(&tz->lock);
}
-void thermal_set_delay_jiffies(unsigned long *delay_jiffies, int delay_ms)
-{
- *delay_jiffies = msecs_to_jiffies(delay_ms);
- if (delay_ms > 1000)
- *delay_jiffies = round_jiffies(*delay_jiffies);
-}
-
static void thermal_cdev_set_cur_state(struct thermal_cooling_device *cdev,
int target)
{
--
2.25.1
Now that we have the thermal trip stored in the thermal zone in a
generic way, we can rely on them and remove one indirection we found
in the thermal_of code and do one more step forward the removal of the
duplicated structures.
Cc: Alexandre Bailon <[email protected]>
Cc: Kevin Hilman <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
---
drivers/thermal/thermal_of.c | 53 +++++++++++-------------------------
1 file changed, 16 insertions(+), 37 deletions(-)
diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index e187461dd396..b59eec4af0eb 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -118,12 +118,7 @@ static int of_thermal_set_trips(struct thermal_zone_device *tz,
*/
int of_thermal_get_ntrips(struct thermal_zone_device *tz)
{
- struct __thermal_zone *data = tz->devdata;
-
- if (!data || IS_ERR(data))
- return -ENODEV;
-
- return data->ntrips;
+ return tz->num_trips;
}
EXPORT_SYMBOL_GPL(of_thermal_get_ntrips);
@@ -139,9 +134,7 @@ EXPORT_SYMBOL_GPL(of_thermal_get_ntrips);
*/
bool of_thermal_is_trip_valid(struct thermal_zone_device *tz, int trip)
{
- struct __thermal_zone *data = tz->devdata;
-
- if (!data || trip >= data->ntrips || trip < 0)
+ if (trip >= tz->num_trips || trip < 0)
return false;
return true;
@@ -161,12 +154,7 @@ EXPORT_SYMBOL_GPL(of_thermal_is_trip_valid);
const struct thermal_trip *
of_thermal_get_trip_points(struct thermal_zone_device *tz)
{
- struct __thermal_zone *data = tz->devdata;
-
- if (!data)
- return NULL;
-
- return data->trips;
+ return tz->trips;
}
EXPORT_SYMBOL_GPL(of_thermal_get_trip_points);
@@ -281,12 +269,10 @@ static int of_thermal_unbind(struct thermal_zone_device *thermal,
static int of_thermal_get_trip_type(struct thermal_zone_device *tz, int trip,
enum thermal_trip_type *type)
{
- struct __thermal_zone *data = tz->devdata;
-
- if (trip >= data->ntrips || trip < 0)
+ if (trip >= tz->num_trips || trip < 0)
return -EDOM;
- *type = data->trips[trip].type;
+ *type = tz->trips[trip].type;
return 0;
}
@@ -294,12 +280,10 @@ static int of_thermal_get_trip_type(struct thermal_zone_device *tz, int trip,
static int of_thermal_get_trip_temp(struct thermal_zone_device *tz, int trip,
int *temp)
{
- struct __thermal_zone *data = tz->devdata;
-
- if (trip >= data->ntrips || trip < 0)
+ if (trip >= tz->num_trips || trip < 0)
return -EDOM;
- *temp = data->trips[trip].temperature;
+ *temp = tz->trips[trip].temperature;
return 0;
}
@@ -309,7 +293,7 @@ static int of_thermal_set_trip_temp(struct thermal_zone_device *tz, int trip,
{
struct __thermal_zone *data = tz->devdata;
- if (trip >= data->ntrips || trip < 0)
+ if (trip >= tz->num_trips || trip < 0)
return -EDOM;
if (data->ops && data->ops->set_trip_temp) {
@@ -321,7 +305,7 @@ static int of_thermal_set_trip_temp(struct thermal_zone_device *tz, int trip,
}
/* thermal framework should take care of data->mask & (1 << trip) */
- data->trips[trip].temperature = temp;
+ tz->trips[trip].temperature = temp;
return 0;
}
@@ -329,12 +313,10 @@ static int of_thermal_set_trip_temp(struct thermal_zone_device *tz, int trip,
static int of_thermal_get_trip_hyst(struct thermal_zone_device *tz, int trip,
int *hyst)
{
- struct __thermal_zone *data = tz->devdata;
-
- if (trip >= data->ntrips || trip < 0)
+ if (trip >= tz->num_trips || trip < 0)
return -EDOM;
- *hyst = data->trips[trip].hysteresis;
+ *hyst = tz->trips[trip].hysteresis;
return 0;
}
@@ -342,13 +324,11 @@ static int of_thermal_get_trip_hyst(struct thermal_zone_device *tz, int trip,
static int of_thermal_set_trip_hyst(struct thermal_zone_device *tz, int trip,
int hyst)
{
- struct __thermal_zone *data = tz->devdata;
-
- if (trip >= data->ntrips || trip < 0)
+ if (trip >= tz->num_trips || trip < 0)
return -EDOM;
/* thermal framework should take care of data->mask & (1 << trip) */
- data->trips[trip].hysteresis = hyst;
+ tz->trips[trip].hysteresis = hyst;
return 0;
}
@@ -356,12 +336,11 @@ static int of_thermal_set_trip_hyst(struct thermal_zone_device *tz, int trip,
static int of_thermal_get_crit_temp(struct thermal_zone_device *tz,
int *temp)
{
- struct __thermal_zone *data = tz->devdata;
int i;
- for (i = 0; i < data->ntrips; i++)
- if (data->trips[i].type == THERMAL_TRIP_CRITICAL) {
- *temp = data->trips[i].temperature;
+ for (i = 0; i < tz->num_trips; i++)
+ if (tz->trips[i].type == THERMAL_TRIP_CRITICAL) {
+ *temp = tz->trips[i].temperature;
return 0;
}
--
2.25.1
Self contain the trip initialization from the device tree in a single
function for the sake of making the code flow more clear.
Cc: Alexandre Bailon <[email protected]>
Cc: Kevin Hilman <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
---
drivers/thermal/thermal_of.c | 86 ++++++++++++++++++++++++------------
1 file changed, 57 insertions(+), 29 deletions(-)
diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index b59eec4af0eb..0693edc00f60 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -693,7 +693,8 @@ static int of_find_trip_id(struct device_node *np, struct device_node *trip)
*
* Return: 0 on success, proper error code otherwise
*/
-static int thermal_of_populate_bind_params(struct device_node *np,
+static int thermal_of_populate_bind_params(struct device_node *tz_np,
+ struct device_node *np,
struct __thermal_bind_params *__tbp)
{
struct of_phandle_args cooling_spec;
@@ -715,7 +716,7 @@ static int thermal_of_populate_bind_params(struct device_node *np,
return -ENODEV;
}
- trip_id = of_find_trip_id(np, trip);
+ trip_id = of_find_trip_id(tz_np, trip);
if (trip_id < 0) {
ret = trip_id;
goto end;
@@ -849,6 +850,53 @@ static int thermal_of_populate_trip(struct device_node *np,
return 0;
}
+static struct thermal_trip *thermal_of_trips_init(struct device_node *np, int *ntrips)
+{
+ struct thermal_trip *tt;
+ struct device_node *trips, *trip;
+ int ret, count;
+
+ trips = of_get_child_by_name(np, "trips");
+ if (!trips) {
+ pr_err("Failed to find 'trips' node\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ count = of_get_child_count(trips);
+ if (!count) {
+ pr_err("No trip point defined\n");
+ ret = -EINVAL;
+ goto out_of_node_put;
+ }
+
+ tt = kzalloc(sizeof(*tt) * count, GFP_KERNEL);
+ if (!tt) {
+ ret = -ENOMEM;
+ goto out_of_node_put;
+ }
+
+ *ntrips = count;
+
+ count = 0;
+ for_each_child_of_node(trips, trip) {
+ ret = thermal_of_populate_trip(trip, &tt[count++]);
+ if (ret)
+ goto out_kfree;
+ }
+
+ of_node_put(trips);
+
+ return tt;
+
+out_kfree:
+ kfree(tt);
+ *ntrips = 0;
+out_of_node_put:
+ of_node_put(trips);
+
+ return ERR_PTR(ret);
+}
+
/**
* thermal_of_build_thermal_zone - parse and fill one thermal zone data
* @np: DT node containing a thermal zone node
@@ -867,7 +915,6 @@ static struct __thermal_zone
__init *thermal_of_build_thermal_zone(struct device_node *np)
{
struct device_node *child = NULL, *gchild;
- struct device_node *trips;
struct __thermal_zone *tz;
int ret, i;
u32 prop, coef[2];
@@ -909,28 +956,10 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
tz->offset = 0;
}
- /* trips */
- trips = of_get_child_by_name(np, "trips");
-
- /* No trips provided */
- if (!trips)
+ tz->trips = thermal_of_trips_init(np, &tz->ntrips);
+ if (IS_ERR(tz->trips)) {
+ ret = PTR_ERR(tz->trips);
goto finish;
-
- tz->ntrips = of_get_child_count(trips);
- if (tz->ntrips == 0) /* must have at least one child */
- goto finish;
-
- tz->trips = kcalloc(tz->ntrips, sizeof(*tz->trips), GFP_KERNEL);
- if (!tz->trips) {
- ret = -ENOMEM;
- goto free_tz;
- }
-
- i = 0;
- for_each_child_of_node(trips, gchild) {
- ret = thermal_of_populate_trip(gchild, &tz->trips[i++]);
- if (ret)
- goto free_trips;
}
/* cooling-maps */
@@ -952,13 +981,14 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
i = 0;
for_each_child_of_node(child, gchild) {
- ret = thermal_of_populate_bind_params(gchild, &tz->tbps[i++]);
- if (ret)
+ ret = thermal_of_populate_bind_params(np, gchild, &tz->tbps[i++]);
+ if (ret) {
+ of_node_put(gchild);
goto free_tbps;
+ }
}
finish:
- of_node_put(trips);
of_node_put(child);
return tz;
@@ -977,8 +1007,6 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
kfree(tz->tbps);
free_trips:
kfree(tz->trips);
- of_node_put(trips);
- of_node_put(gchild);
free_tz:
kfree(tz);
of_node_put(child);
--
2.25.1
The thermal trip points are properties of a thermal zone and the
different sub systems should be able to save them in the thermal zone
structure instead of having their own definition.
Give the opportunity to the drivers to create a thermal zone with
thermal trips which will be accessible directly from the thermal core
framework.
As we added the thermal trip points structure in the thermal zone,
let's extend the thermal zone register function to have the thermal
trip structures as a parameter and store it in the 'trips' field of
the thermal zone structure.
The thermal zone contains the trip point, we can store them directly
when registering the thermal zone. That will allow another step
forward to remove the duplicate thermal zone structure we find in the
thermal_of code.
Cc: Alexandre Bailon <[email protected]>
Cc: Kevin Hilman <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
---
drivers/thermal/thermal_core.c | 22 +++++++++++++++++-----
drivers/thermal/thermal_of.c | 8 +++-----
include/linux/thermal.h | 8 ++++++++
3 files changed, 28 insertions(+), 10 deletions(-)
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index cb9b1bd03bd3..0d9e9b175f93 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1167,8 +1167,9 @@ static void thermal_set_delay_jiffies(unsigned long *delay_jiffies, int delay_ms
}
/**
- * thermal_zone_device_register() - register a new thermal zone device
+ * thermal_zone_device_register_with_trips() - register a new thermal zone device
* @type: the thermal zone device type
+ * @trips: a pointer to an array of thermal trips
* @num_trips: the number of trip points the thermal zone support
* @mask: a bit string indicating the writeablility of trip points
* @devdata: private device data
@@ -1191,10 +1192,10 @@ static void thermal_set_delay_jiffies(unsigned long *delay_jiffies, int delay_ms
* IS_ERR*() helpers.
*/
struct thermal_zone_device *
-thermal_zone_device_register(const char *type, int num_trips, int mask,
- void *devdata, struct thermal_zone_device_ops *ops,
- struct thermal_zone_params *tzp, int passive_delay,
- int polling_delay)
+thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *trips, int num_trips, int mask,
+ void *devdata, struct thermal_zone_device_ops *ops,
+ struct thermal_zone_params *tzp, int passive_delay,
+ int polling_delay)
{
struct thermal_zone_device *tz;
enum thermal_trip_type trip_type;
@@ -1255,6 +1256,7 @@ thermal_zone_device_register(const char *type, int num_trips, int mask,
tz->tzp = tzp;
tz->device.class = &thermal_class;
tz->devdata = devdata;
+ tz->trips = trips;
tz->num_trips = num_trips;
thermal_set_delay_jiffies(&tz->passive_delay_jiffies, passive_delay);
@@ -1331,6 +1333,16 @@ thermal_zone_device_register(const char *type, int num_trips, int mask,
kfree(tz);
return ERR_PTR(result);
}
+
+struct thermal_zone_device *thermal_zone_device_register(const char *type, int ntrips, int mask,
+ void *devdata, struct thermal_zone_device_ops *ops,
+ struct thermal_zone_params *tzp, int passive_delay,
+ int polling_delay)
+{
+ return thermal_zone_device_register_with_trips(type, NULL, ntrips, mask,
+ devdata, ops, tzp,
+ passive_delay, polling_delay);
+}
EXPORT_SYMBOL_GPL(thermal_zone_device_register);
/**
diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 19243c57b3f4..e187461dd396 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -1119,11 +1119,9 @@ int __init of_parse_thermal_zones(void)
tzp->slope = tz->slope;
tzp->offset = tz->offset;
- zone = thermal_zone_device_register(child->name, tz->ntrips,
- mask, tz,
- ops, tzp,
- tz->passive_delay,
- tz->polling_delay);
+ zone = thermal_zone_device_register_with_trips(child->name, tz->trips, tz->ntrips,
+ mask, tz, ops, tzp, tz->passive_delay,
+ tz->polling_delay);
if (IS_ERR(zone)) {
pr_err("Failed to build %pOFn zone %ld\n", child,
PTR_ERR(zone));
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 03e968d61471..fde4689a1755 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -125,6 +125,7 @@ struct thermal_cooling_device {
* @trip_hyst_attrs: attributes for trip points for sysfs: trip hysteresis
* @mode: current mode of this thermal zone
* @devdata: private pointer for device private data
+ * @trips: an array of struct thermal_trip
* @num_trips: number of trip points the thermal zone supports
* @trips_disabled; bitmap for disabled trips
* @passive_delay_jiffies: number of jiffies to wait between polls when
@@ -165,6 +166,7 @@ struct thermal_zone_device {
struct thermal_attr *trip_hyst_attrs;
enum thermal_device_mode mode;
void *devdata;
+ struct thermal_trip *trips;
int num_trips;
unsigned long trips_disabled; /* bitmap for disabled trips */
unsigned long passive_delay_jiffies;
@@ -378,8 +380,14 @@ void devm_thermal_zone_of_sensor_unregister(struct device *dev,
struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
void *, struct thermal_zone_device_ops *,
struct thermal_zone_params *, int, int);
+
void thermal_zone_device_unregister(struct thermal_zone_device *);
+struct thermal_zone_device *
+thermal_zone_device_register_with_trips(const char *, struct thermal_trip *, int, int,
+ void *, struct thermal_zone_device_ops *,
+ struct thermal_zone_params *, int, int);
+
int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
struct thermal_cooling_device *,
unsigned long, unsigned long,
--
2.25.1
In order to use thermal trips defined in the thermal structure, rename
the 'trips' field to 'num_trips' to have the 'trips' field containing the
thermal trip points.
Cc: Alexandre Bailon <[email protected]>
Cc: Kevin Hilman <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
---
drivers/thermal/gov_fair_share.c | 6 +++---
drivers/thermal/gov_power_allocator.c | 4 ++--
drivers/thermal/tegra/tegra30-tsensor.c | 2 +-
drivers/thermal/thermal_core.c | 20 ++++++++++----------
drivers/thermal/thermal_helpers.c | 4 ++--
drivers/thermal/thermal_netlink.c | 2 +-
drivers/thermal/thermal_sysfs.c | 22 +++++++++++-----------
include/linux/thermal.h | 4 ++--
8 files changed, 32 insertions(+), 32 deletions(-)
diff --git a/drivers/thermal/gov_fair_share.c b/drivers/thermal/gov_fair_share.c
index 1e5abf4822be..6a2abcfc648f 100644
--- a/drivers/thermal/gov_fair_share.c
+++ b/drivers/thermal/gov_fair_share.c
@@ -25,10 +25,10 @@ static int get_trip_level(struct thermal_zone_device *tz)
int trip_temp;
enum thermal_trip_type trip_type;
- if (tz->trips == 0 || !tz->ops->get_trip_temp)
+ if (tz->num_trips == 0 || !tz->ops->get_trip_temp)
return 0;
- for (count = 0; count < tz->trips; count++) {
+ for (count = 0; count < tz->num_trips; count++) {
tz->ops->get_trip_temp(tz, count, &trip_temp);
if (tz->temperature < trip_temp)
break;
@@ -53,7 +53,7 @@ static long get_target_state(struct thermal_zone_device *tz,
cdev->ops->get_max_state(cdev, &max_state);
- return (long)(percentage * level * max_state) / (100 * tz->trips);
+ return (long)(percentage * level * max_state) / (100 * tz->num_trips);
}
/**
diff --git a/drivers/thermal/gov_power_allocator.c b/drivers/thermal/gov_power_allocator.c
index 13e375751d22..1d5052470967 100644
--- a/drivers/thermal/gov_power_allocator.c
+++ b/drivers/thermal/gov_power_allocator.c
@@ -527,7 +527,7 @@ static void get_governor_trips(struct thermal_zone_device *tz,
last_active = INVALID_TRIP;
last_passive = INVALID_TRIP;
- for (i = 0; i < tz->trips; i++) {
+ for (i = 0; i < tz->num_trips; i++) {
enum thermal_trip_type type;
int ret;
@@ -668,7 +668,7 @@ static int power_allocator_bind(struct thermal_zone_device *tz)
get_governor_trips(tz, params);
- if (tz->trips > 0) {
+ if (tz->num_trips > 0) {
ret = tz->ops->get_trip_temp(tz,
params->trip_max_desired_temperature,
&control_temp);
diff --git a/drivers/thermal/tegra/tegra30-tsensor.c b/drivers/thermal/tegra/tegra30-tsensor.c
index 9b6b693cbcf8..05886684f429 100644
--- a/drivers/thermal/tegra/tegra30-tsensor.c
+++ b/drivers/thermal/tegra/tegra30-tsensor.c
@@ -316,7 +316,7 @@ static void tegra_tsensor_get_hw_channel_trips(struct thermal_zone_device *tzd,
*hot_trip = 85000;
*crit_trip = 90000;
- for (i = 0; i < tzd->trips; i++) {
+ for (i = 0; i < tzd->num_trips; i++) {
enum thermal_trip_type type;
int trip_temp;
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index a8b1628937c6..cb9b1bd03bd3 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -505,7 +505,7 @@ void thermal_zone_device_update(struct thermal_zone_device *tz,
tz->notify_event = event;
- for (count = 0; count < tz->trips; count++)
+ for (count = 0; count < tz->num_trips; count++)
handle_thermal_trip(tz, count);
}
EXPORT_SYMBOL_GPL(thermal_zone_device_update);
@@ -630,7 +630,7 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
unsigned long max_state;
int result, ret;
- if (trip >= tz->trips || trip < 0)
+ if (trip >= tz->num_trips || trip < 0)
return -EINVAL;
list_for_each_entry(pos1, &thermal_tz_list, node) {
@@ -811,7 +811,7 @@ static void __bind(struct thermal_zone_device *tz, int mask,
{
int i, ret;
- for (i = 0; i < tz->trips; i++) {
+ for (i = 0; i < tz->num_trips; i++) {
if (mask & (1 << i)) {
unsigned long upper, lower;
@@ -1057,7 +1057,7 @@ static void __unbind(struct thermal_zone_device *tz, int mask,
{
int i;
- for (i = 0; i < tz->trips; i++)
+ for (i = 0; i < tz->num_trips; i++)
if (mask & (1 << i))
thermal_zone_unbind_cooling_device(tz, i, cdev);
}
@@ -1169,7 +1169,7 @@ static void thermal_set_delay_jiffies(unsigned long *delay_jiffies, int delay_ms
/**
* thermal_zone_device_register() - register a new thermal zone device
* @type: the thermal zone device type
- * @trips: the number of trip points the thermal zone support
+ * @num_trips: the number of trip points the thermal zone support
* @mask: a bit string indicating the writeablility of trip points
* @devdata: private device data
* @ops: standard thermal zone device callbacks
@@ -1191,7 +1191,7 @@ static void thermal_set_delay_jiffies(unsigned long *delay_jiffies, int delay_ms
* IS_ERR*() helpers.
*/
struct thermal_zone_device *
-thermal_zone_device_register(const char *type, int trips, int mask,
+thermal_zone_device_register(const char *type, int num_trips, int mask,
void *devdata, struct thermal_zone_device_ops *ops,
struct thermal_zone_params *tzp, int passive_delay,
int polling_delay)
@@ -1215,7 +1215,7 @@ thermal_zone_device_register(const char *type, int trips, int mask,
return ERR_PTR(-EINVAL);
}
- if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) {
+ if (num_trips > THERMAL_MAX_TRIPS || num_trips < 0 || mask >> num_trips) {
pr_err("Incorrect number of thermal trips\n");
return ERR_PTR(-EINVAL);
}
@@ -1225,7 +1225,7 @@ thermal_zone_device_register(const char *type, int trips, int mask,
return ERR_PTR(-EINVAL);
}
- if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
+ if (num_trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
return ERR_PTR(-EINVAL);
tz = kzalloc(sizeof(*tz), GFP_KERNEL);
@@ -1255,7 +1255,7 @@ thermal_zone_device_register(const char *type, int trips, int mask,
tz->tzp = tzp;
tz->device.class = &thermal_class;
tz->devdata = devdata;
- tz->trips = trips;
+ tz->num_trips = num_trips;
thermal_set_delay_jiffies(&tz->passive_delay_jiffies, passive_delay);
thermal_set_delay_jiffies(&tz->polling_delay_jiffies, polling_delay);
@@ -1273,7 +1273,7 @@ thermal_zone_device_register(const char *type, int trips, int mask,
if (result)
goto release_device;
- for (count = 0; count < trips; count++) {
+ for (count = 0; count < num_trips; count++) {
if (tz->ops->get_trip_type(tz, count, &trip_type) ||
tz->ops->get_trip_temp(tz, count, &trip_temp) ||
!trip_temp)
diff --git a/drivers/thermal/thermal_helpers.c b/drivers/thermal/thermal_helpers.c
index 60bfda1a1db7..690890f054a3 100644
--- a/drivers/thermal/thermal_helpers.c
+++ b/drivers/thermal/thermal_helpers.c
@@ -89,7 +89,7 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
ret = tz->ops->get_temp(tz, temp);
if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
- for (count = 0; count < tz->trips; count++) {
+ for (count = 0; count < tz->num_trips; count++) {
ret = tz->ops->get_trip_type(tz, count, &type);
if (!ret && type == THERMAL_TRIP_CRITICAL) {
ret = tz->ops->get_trip_temp(tz, count,
@@ -137,7 +137,7 @@ void thermal_zone_set_trips(struct thermal_zone_device *tz)
if (!tz->ops->set_trips || !tz->ops->get_trip_hyst)
goto exit;
- for (i = 0; i < tz->trips; i++) {
+ for (i = 0; i < tz->num_trips; i++) {
int trip_low;
tz->ops->get_trip_temp(tz, i, &trip_temp);
diff --git a/drivers/thermal/thermal_netlink.c b/drivers/thermal/thermal_netlink.c
index 32fea5174cc0..050d243a5fa1 100644
--- a/drivers/thermal/thermal_netlink.c
+++ b/drivers/thermal/thermal_netlink.c
@@ -469,7 +469,7 @@ static int thermal_genl_cmd_tz_get_trip(struct param *p)
mutex_lock(&tz->lock);
- for (i = 0; i < tz->trips; i++) {
+ for (i = 0; i < tz->num_trips; i++) {
enum thermal_trip_type type;
int temp, hyst = 0;
diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c
index 1c4aac8464a7..5018459e8dd9 100644
--- a/drivers/thermal/thermal_sysfs.c
+++ b/drivers/thermal/thermal_sysfs.c
@@ -416,15 +416,15 @@ static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
int indx;
/* This function works only for zones with at least one trip */
- if (tz->trips <= 0)
+ if (tz->num_trips <= 0)
return -EINVAL;
- tz->trip_type_attrs = kcalloc(tz->trips, sizeof(*tz->trip_type_attrs),
+ tz->trip_type_attrs = kcalloc(tz->num_trips, sizeof(*tz->trip_type_attrs),
GFP_KERNEL);
if (!tz->trip_type_attrs)
return -ENOMEM;
- tz->trip_temp_attrs = kcalloc(tz->trips, sizeof(*tz->trip_temp_attrs),
+ tz->trip_temp_attrs = kcalloc(tz->num_trips, sizeof(*tz->trip_temp_attrs),
GFP_KERNEL);
if (!tz->trip_temp_attrs) {
kfree(tz->trip_type_attrs);
@@ -432,7 +432,7 @@ static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
}
if (tz->ops->get_trip_hyst) {
- tz->trip_hyst_attrs = kcalloc(tz->trips,
+ tz->trip_hyst_attrs = kcalloc(tz->num_trips,
sizeof(*tz->trip_hyst_attrs),
GFP_KERNEL);
if (!tz->trip_hyst_attrs) {
@@ -442,7 +442,7 @@ static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
}
}
- attrs = kcalloc(tz->trips * 3 + 1, sizeof(*attrs), GFP_KERNEL);
+ attrs = kcalloc(tz->num_trips * 3 + 1, sizeof(*attrs), GFP_KERNEL);
if (!attrs) {
kfree(tz->trip_type_attrs);
kfree(tz->trip_temp_attrs);
@@ -451,7 +451,7 @@ static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
return -ENOMEM;
}
- for (indx = 0; indx < tz->trips; indx++) {
+ for (indx = 0; indx < tz->num_trips; indx++) {
/* create trip type attribute */
snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
"trip_point_%d_type", indx);
@@ -478,7 +478,7 @@ static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
tz->trip_temp_attrs[indx].attr.store =
trip_point_temp_store;
}
- attrs[indx + tz->trips] = &tz->trip_temp_attrs[indx].attr.attr;
+ attrs[indx + tz->num_trips] = &tz->trip_temp_attrs[indx].attr.attr;
/* create Optional trip hyst attribute */
if (!tz->ops->get_trip_hyst)
@@ -496,10 +496,10 @@ static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
tz->trip_hyst_attrs[indx].attr.store =
trip_point_hyst_store;
}
- attrs[indx + tz->trips * 2] =
+ attrs[indx + tz->num_trips * 2] =
&tz->trip_hyst_attrs[indx].attr.attr;
}
- attrs[tz->trips * 3] = NULL;
+ attrs[tz->num_trips * 3] = NULL;
tz->trips_attribute_group.attrs = attrs;
@@ -540,7 +540,7 @@ int thermal_zone_create_device_groups(struct thermal_zone_device *tz,
for (i = 0; i < size - 2; i++)
groups[i] = thermal_zone_attribute_groups[i];
- if (tz->trips) {
+ if (tz->num_trips) {
result = create_trip_attrs(tz, mask);
if (result) {
kfree(groups);
@@ -561,7 +561,7 @@ void thermal_zone_destroy_device_groups(struct thermal_zone_device *tz)
if (!tz)
return;
- if (tz->trips)
+ if (tz->num_trips)
destroy_trip_attrs(tz);
kfree(tz->device.groups);
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 6289b0bb1c97..03e968d61471 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -125,7 +125,7 @@ struct thermal_cooling_device {
* @trip_hyst_attrs: attributes for trip points for sysfs: trip hysteresis
* @mode: current mode of this thermal zone
* @devdata: private pointer for device private data
- * @trips: number of trip points the thermal zone supports
+ * @num_trips: number of trip points the thermal zone supports
* @trips_disabled; bitmap for disabled trips
* @passive_delay_jiffies: number of jiffies to wait between polls when
* performing passive cooling.
@@ -165,7 +165,7 @@ struct thermal_zone_device {
struct thermal_attr *trip_hyst_attrs;
enum thermal_device_mode mode;
void *devdata;
- int trips;
+ int num_trips;
unsigned long trips_disabled; /* bitmap for disabled trips */
unsigned long passive_delay_jiffies;
unsigned long polling_delay_jiffies;
--
2.25.1
The thermal_of code builds a trip array associated with the node
pointer in order to compare the trip point phandle with the list.
The thermal trip is a thermal zone property and should be moved
there. If some sensors have hardcoded trip points, they should use the
exported structure instead of redefining again and again their own
structure and data to describe exactly the same things.
In order to move this to the thermal.h header and allow more cleanup,
we need to remove the node pointer from the structure.
Instead of building storing the device node, we search directly in the
device tree the corresponding node. That results in a simplification
of the code and allows to move the structure to thermal.h
Cc: Alexandre Bailon <[email protected]>
Cc: Kevin Hilman <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
---
drivers/thermal/thermal_of.c | 64 +++++++++++++++++++++++++-----------
1 file changed, 44 insertions(+), 20 deletions(-)
diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index b65d435cb92f..7d96494ef94d 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -671,6 +671,35 @@ EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_unregister);
/*** functions parsing device tree nodes ***/
+static int of_find_trip_id(struct device_node *np, struct device_node *trip)
+{
+ struct device_node *trips;
+ struct device_node *t;
+ int i = 0;
+
+ trips = of_get_child_by_name(np, "trips");
+ if (!trips) {
+ pr_err("Failed to find 'trips' node\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Find the trip id point associated with the cooling device map
+ */
+ for_each_child_of_node(trips, t) {
+
+ if (t == trip)
+ goto out;
+ i++;
+ }
+
+ i = -ENXIO;
+out:
+ of_node_put(trips);
+
+ return i;
+}
+
/**
* thermal_of_populate_bind_params - parse and fill cooling map data
* @np: DT node containing a cooling-map node
@@ -686,14 +715,13 @@ EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_unregister);
* Return: 0 on success, proper error code otherwise
*/
static int thermal_of_populate_bind_params(struct device_node *np,
- struct __thermal_bind_params *__tbp,
- struct thermal_trip *trips,
- int ntrips)
+ struct __thermal_bind_params *__tbp)
{
struct of_phandle_args cooling_spec;
struct __thermal_cooling_bind_param *__tcbp;
struct device_node *trip;
int ret, i, count;
+ int trip_id;
u32 prop;
/* Default weight. Usage is optional */
@@ -708,18 +736,14 @@ static int thermal_of_populate_bind_params(struct device_node *np,
return -ENODEV;
}
- /* match using device_node */
- for (i = 0; i < ntrips; i++)
- if (trip == trips[i].np) {
- __tbp->trip_id = i;
- break;
- }
-
- if (i == ntrips) {
- ret = -ENODEV;
+ trip_id = of_find_trip_id(np, trip);
+ if (trip_id < 0) {
+ ret = trip_id;
goto end;
}
+ __tbp->trip_id = trip_id;
+
count = of_count_phandle_with_args(np, "cooling-device",
"#cooling-cells");
if (count <= 0) {
@@ -868,6 +892,7 @@ static struct __thermal_zone
__init *thermal_of_build_thermal_zone(struct device_node *np)
{
struct device_node *child = NULL, *gchild;
+ struct device_node *trips;
struct __thermal_zone *tz;
int ret, i;
u32 prop, coef[2];
@@ -910,13 +935,13 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
}
/* trips */
- child = of_get_child_by_name(np, "trips");
+ trips = of_get_child_by_name(np, "trips");
/* No trips provided */
- if (!child)
+ if (!trips)
goto finish;
- tz->ntrips = of_get_child_count(child);
+ tz->ntrips = of_get_child_count(trips);
if (tz->ntrips == 0) /* must have at least one child */
goto finish;
@@ -927,14 +952,12 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
}
i = 0;
- for_each_child_of_node(child, gchild) {
+ for_each_child_of_node(trips, gchild) {
ret = thermal_of_populate_trip(gchild, &tz->trips[i++]);
if (ret)
goto free_trips;
}
- of_node_put(child);
-
/* cooling-maps */
child = of_get_child_by_name(np, "cooling-maps");
@@ -954,13 +977,13 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
i = 0;
for_each_child_of_node(child, gchild) {
- ret = thermal_of_populate_bind_params(gchild, &tz->tbps[i++],
- tz->trips, tz->ntrips);
+ ret = thermal_of_populate_bind_params(gchild, &tz->tbps[i++]);
if (ret)
goto free_tbps;
}
finish:
+ of_node_put(trips);
of_node_put(child);
return tz;
@@ -981,6 +1004,7 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
for (i = 0; i < tz->ntrips; i++)
of_node_put(tz->trips[i].np);
kfree(tz->trips);
+ of_node_put(trips);
of_node_put(gchild);
free_tz:
kfree(tz);
--
2.25.1
Hi Rafael,
On 22/07/2022 21:59, Daniel Lezcano wrote:
> The thermal framework initialization with the device tree appears to
> be complicated and hard to make it to evolve.
>
> It contains duplication of almost the same thermal generic structures
> and has an assymetric initialization making hard any kind of serious
> changes for more complex features. One of them is the multiple sensors
> support per thermal zone.
>
> In order to set the scene for the aforementioned feature with generic
> code, we need to cleanup and rework the device tree initialization.
>
> However this rework is not obvious because of the multiple components
> entering in the composition of a thermal zone and being initialized at
> different moments. For instance, a cooling device can be initialized
> before a sensor, so the thermal zones must exist before the cooling
> device as well as the sensor. This asynchronous initialization forces
> the thermal zone to be created with fake ops because they are
> mandotory and build a list of cooling devices which is used to lookup
> afterwards when the cooling device driver is registering itself.
>
> As there could be a large number of changes, this first series provide
> some steps forward for a simpler device tree initialization.
>
> More series for cleanup and code duplication removal will follow.
>
> Changelog:
>
> - v6:
> - Folded patches 8, 9, 10
> - Removed thermal_zone_get_trips() and thermal_zone_get_num_trips()
> - Moved tz->ntrips => tz->num_trips changes into patch 11 to fix the
> git bisecting
>
I believe all the comments were addressed, is it fine if I merge this
series ?
--
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Hi Daniel,
On Mon, Jul 25, 2022 at 6:34 PM Daniel Lezcano
<[email protected]> wrote:
>
>
> Hi Rafael,
>
> On 22/07/2022 21:59, Daniel Lezcano wrote:
> > The thermal framework initialization with the device tree appears to
> > be complicated and hard to make it to evolve.
> >
> > It contains duplication of almost the same thermal generic structures
> > and has an assymetric initialization making hard any kind of serious
> > changes for more complex features. One of them is the multiple sensors
> > support per thermal zone.
> >
> > In order to set the scene for the aforementioned feature with generic
> > code, we need to cleanup and rework the device tree initialization.
> >
> > However this rework is not obvious because of the multiple components
> > entering in the composition of a thermal zone and being initialized at
> > different moments. For instance, a cooling device can be initialized
> > before a sensor, so the thermal zones must exist before the cooling
> > device as well as the sensor. This asynchronous initialization forces
> > the thermal zone to be created with fake ops because they are
> > mandotory and build a list of cooling devices which is used to lookup
> > afterwards when the cooling device driver is registering itself.
> >
> > As there could be a large number of changes, this first series provide
> > some steps forward for a simpler device tree initialization.
> >
> > More series for cleanup and code duplication removal will follow.
> >
> > Changelog:
> >
> > - v6:
> > - Folded patches 8, 9, 10
> > - Removed thermal_zone_get_trips() and thermal_zone_get_num_trips()
> > - Moved tz->ntrips => tz->num_trips changes into patch 11 to fix the
> > git bisecting
> >
>
> I believe all the comments were addressed, is it fine if I merge this
> series ?
Yes, please!
Hi Daniel,
On 7/25/22 17:34, Daniel Lezcano wrote:
>
> Hi Rafael,
>
> On 22/07/2022 21:59, Daniel Lezcano wrote:
>> The thermal framework initialization with the device tree appears to
>> be complicated and hard to make it to evolve.
>>
>> It contains duplication of almost the same thermal generic structures
>> and has an assymetric initialization making hard any kind of serious
>> changes for more complex features. One of them is the multiple sensors
>> support per thermal zone.
>>
>> In order to set the scene for the aforementioned feature with generic
>> code, we need to cleanup and rework the device tree initialization.
>>
>> However this rework is not obvious because of the multiple components
>> entering in the composition of a thermal zone and being initialized at
>> different moments. For instance, a cooling device can be initialized
>> before a sensor, so the thermal zones must exist before the cooling
>> device as well as the sensor. This asynchronous initialization forces
>> the thermal zone to be created with fake ops because they are
>> mandotory and build a list of cooling devices which is used to lookup
>> afterwards when the cooling device driver is registering itself.
>>
>> As there could be a large number of changes, this first series provide
>> some steps forward for a simpler device tree initialization.
>>
>> More series for cleanup and code duplication removal will follow.
>>
>> Changelog:
>>
>> - v6:
>> - Folded patches 8, 9, 10
>> - Removed thermal_zone_get_trips() and thermal_zone_get_num_trips()
>> - Moved tz->ntrips => tz->num_trips changes into patch 11 to fix the
>> git bisecting
>>
>
> I believe all the comments were addressed, is it fine if I merge this
> series ?
>
>
My apologies for being quiet, I was on holiday last week.
Please don't wait for me, I'm still catching up with internal stuff.
Based on your changelog I can see you've addressed my comments.
Regards,
Lukasz