RE: [PATCHv4 5/9] Thermal: Add trip point sysfs nodes for sensor

From: R, Durgadoss
Date: Thu Oct 31 2013 - 01:25:57 EST

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In reply to: Srinivas Pandruvada: "Re: [PATCHv4 5/9] Thermal: Add trip point sysfs nodes for sensor"
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> -----Original Message-----
> From: linux-pm-owner@xxxxxxxxxxxxxxx [mailto:linux-pm-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Srinivas Pandruvada
> Sent: Thursday, October 31, 2013 7:03 AM
> To: R, Durgadoss; Zhang, Rui
> Cc: eduardo.valentin@xxxxxx; linux-pm@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; hongbo.zhang@xxxxxxxxxxxxx; wni@xxxxxxxxxx
> Subject: Re: [PATCHv4 5/9] Thermal: Add trip point sysfs nodes for sensor
>
> You might want to use new DEVICE_ATTR_RO and DEVICE_ATTR_RW in this
> series. GKH wanted this changes in my powercap patchset.

I am working on my next version. Will take care of this in appropriate places.
Thank you for pointing this out.

Thanks,
Durga

>
> Thanks,
> Srinivas
>
> On 10/15/2013 06:12 AM, R, Durgadoss wrote:
> >> -----Original Message-----
> >> From: Zhang, Rui
> >> Sent: Tuesday, October 15, 2013 4:33 PM
> >> To: R, Durgadoss
> >> Cc: eduardo.valentin@xxxxxx; linux-pm@xxxxxxxxxxxxxxx; linux-
> >> kernel@xxxxxxxxxxxxxxx; hongbo.zhang@xxxxxxxxxxxxx; wni@xxxxxxxxxx
> >> Subject: Re: [PATCHv4 5/9] Thermal: Add trip point sysfs nodes for sensor
> >>
> >> On Wed, 2013-10-02 at 00:08 +0530, Durgadoss R wrote:
> >>> This patch adds a trip point related sysfs nodes
> >>> for each sensor under a zone in /sys/class/thermal/zoneX/.
> >>> The nodes will be named, sensorX_trip_activeY,
> >>> sensorX_trip_passiveY, sensorX_trip_hot, sensorX_trip_critical
> >>> for active, passive, hot and critical trip points
> >>> respectively for sensorX.
> >>>
> >>> Signed-off-by: Durgadoss R <durgadoss.r@xxxxxxxxx>
> >>> ---
> >>> drivers/thermal/thermal_core.c | 344
> >> +++++++++++++++++++++++++++++++++++++++-
> >>> include/linux/thermal.h | 40 ++++-
> >>> 2 files changed, 379 insertions(+), 5 deletions(-)
> >>>
> >>> diff --git a/drivers/thermal/thermal_core.c
> b/drivers/thermal/thermal_core.c
> >>> index 3c4ef62..d6e29f6 100644
> >>> --- a/drivers/thermal/thermal_core.c
> >>> +++ b/drivers/thermal/thermal_core.c
> >>> @@ -494,6 +494,60 @@ static void thermal_zone_device_check(struct
> >> work_struct *work)
> >>> thermal_zone_device_update(tz);
> >>> }
> >>>
> >>> +static int get_sensor_indx_by_kobj(struct thermal_zone *tz, const char
> >> *name)
> >>> +{
> >>> + int i, indx = -EINVAL;
> >>> +
> >>> + /* Protect against tz->sensors[i] being unregistered */
> >>> + mutex_lock(&sensor_list_lock);
> >>> +
> >>> + for (i = 0; i < tz->sensor_indx; i++) {
> >>> + if (!strnicmp(name, kobject_name(&tz->sensors[i]-
> >>> device.kobj),
> >>> + THERMAL_NAME_LENGTH)) {
> >>> + indx = i;
> >>> + break;
> >>> + }
> >>> + }
> >>> +
> >>> + mutex_unlock(&sensor_list_lock);
> >>> + return indx;
> >>> +}
> >>> +
> >>> +static void __remove_trip_attr(struct thermal_zone *tz, int indx)
> >>> +{
> >>> + int i;
> >>> + struct thermal_trip_attr *attr = tz->trip_attr[indx];
> >>> + struct thermal_trip_point *trip = tz->sensor_trip[indx];
> >>> +
> >>> + if (!attr || !trip)
> >>> + return;
> >>> +
> >>> + if (trip->crit != THERMAL_TRIPS_NONE)
> >>> + device_remove_file(&tz->device, &attr->crit_attr.attr);
> >>> +
> >>> + if (trip->hot != THERMAL_TRIPS_NONE)
> >>> + device_remove_file(&tz->device, &attr->hot_attr.attr);
> >>> +
> >>> + if (trip->num_passive_trips > 0) {
> >>> + for (i = 0; i < trip->num_passive_trips; i++) {
> >>> + device_remove_file(&tz->device,
> >>> + &attr->passive_attrs[i].attr);
> >>> + }
> >>> + kfree(attr->passive_attrs);
> >>> + }
> >>> +
> >>> + if (trip->num_active_trips > 0) {
> >>> + for (i = 0; i < trip->num_active_trips; i++) {
> >>> + device_remove_file(&tz->device,
> >>> + &attr->active_attrs[i].attr);
> >>> + }
> >>> + kfree(attr->active_attrs);
> >>> + }
> >>> +
> >>> + kfree(tz->trip_attr[indx]);
> >>> + tz->trip_attr[indx] = NULL;
> >>> +}
> >>> +
> >>> static void remove_sensor_from_zone(struct thermal_zone *tz,
> >>> struct thermal_sensor *ts)
> >>> {
> >>> @@ -503,13 +557,19 @@ static void remove_sensor_from_zone(struct
> >> thermal_zone *tz,
> >>> if (indx < 0)
> >>> return;
> >>>
> >>> - sysfs_remove_link(&tz->device.kobj, kobject_name(&ts->device.kobj));
> >>> -
> >>> mutex_lock(&tz->lock);
> >>>
> >>> + /* Remove trip point attributes associated with this sensor */
> >>> + __remove_trip_attr(tz, indx);
> >>> +
> >>> + sysfs_remove_link(&tz->device.kobj, kobject_name(&ts->device.kobj));
> >>> +
> >>> /* Shift the entries in the tz->sensors array */
> >>> - for (j = indx; j < MAX_SENSORS_PER_ZONE - 1; j++)
> >>> + for (j = indx; j < MAX_SENSORS_PER_ZONE - 1; j++) {
> >>> tz->sensors[j] = tz->sensors[j + 1];
> >>> + tz->sensor_trip[j] = tz->sensor_trip[j + 1];
> >>> + tz->trip_attr[j] = tz->trip_attr[j + 1];
> >>> + }
> >>>
> >>> tz->sensor_indx--;
> >>> mutex_unlock(&tz->lock);
> >>> @@ -952,6 +1012,111 @@ emul_temp_store(struct device *dev, struct
> >> device_attribute *attr,
> >>> static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
> >>> #endif/*CONFIG_THERMAL_EMULATION*/
> >>>
> >>> +static ssize_t
> >>> +active_trip_show(struct device *dev, struct device_attribute *attr, char
> *buf)
> >>> +{
> >>> + int i, j, val;
> >>> + char kobj_name[THERMAL_NAME_LENGTH];
> >>> + struct thermal_zone *tz = to_zone(dev);
> >>> +
> >>> + if (!sscanf(attr->attr.name, "sensor%d_trip_active%d", &i, &j))
> >>> + return -EINVAL;
> >>> +
> >>> + snprintf(kobj_name, THERMAL_NAME_LENGTH, "sensor%d", i);
> >>> +
> >>> + mutex_lock(&tz->lock);
> >>> +
> >>> + i = get_sensor_indx_by_kobj(tz, kobj_name);
> >>> + if (i < 0) {
> >>> + mutex_unlock(&tz->lock);
> >>> + return i;
> >>> + }
> >>> +
> >>> + val = tz->sensor_trip[i]->active_trips[j];
> >>> + mutex_unlock(&tz->lock);
> >>> +
> >>> + return sprintf(buf, "%d\n", val);
> >>> +}
> >>> +
> >>> +static ssize_t
> >>> +passive_trip_show(struct device *dev, struct device_attribute *attr, char
> >> *buf)
> >>> +{
> >>> + int i, j, val;
> >>> + char kobj_name[THERMAL_NAME_LENGTH];
> >>> + struct thermal_zone *tz = to_zone(dev);
> >>> +
> >>> + if (!sscanf(attr->attr.name, "sensor%d_trip_passive%d", &i, &j))
> >>> + return -EINVAL;
> >>> +
> >>> + snprintf(kobj_name, THERMAL_NAME_LENGTH, "sensor%d", i);
> >>> +
> >>> + mutex_lock(&tz->lock);
> >>> +
> >>> + i = get_sensor_indx_by_kobj(tz, kobj_name);
> >>> + if (i < 0) {
> >>> + mutex_unlock(&tz->lock);
> >>> + return i;
> >>> + }
> >>> +
> >>> + val = tz->sensor_trip[i]->passive_trips[j];
> >>> + mutex_unlock(&tz->lock);
> >>> +
> >>> + return sprintf(buf, "%d\n", val);
> >>> +}
> >>> +
> >>> +static ssize_t
> >>> +hot_trip_show(struct device *dev, struct device_attribute *attr, char *buf)
> >>> +{
> >>> + int indx, val;
> >>> + char kobj_name[THERMAL_NAME_LENGTH];
> >>> + struct thermal_zone *tz = to_zone(dev);
> >>> +
> >>> + if (!sscanf(attr->attr.name, "sensor%d_trip_hot", &indx))
> >>> + return -EINVAL;
> >>> +
> >>> + snprintf(kobj_name, THERMAL_NAME_LENGTH, "sensor%d", indx);
> >>> +
> >>> + mutex_lock(&tz->lock);
> >>> +
> >>> + indx = get_sensor_indx_by_kobj(tz, kobj_name);
> >>> + if (indx < 0) {
> >>> + mutex_unlock(&tz->lock);
> >>> + return indx;
> >>> + }
> >>> +
> >>> + val = tz->sensor_trip[indx]->hot;
> >>> + mutex_unlock(&tz->lock);
> >>> +
> >>> + return sprintf(buf, "%d\n", val);
> >>> +}
> >>> +
> >>> +static ssize_t
> >>> +critical_trip_show(struct device *dev,
> >>> + struct device_attribute *attr, char *buf)
> >>> +{
> >>> + int indx, val;
> >>> + char kobj_name[THERMAL_NAME_LENGTH];
> >>> + struct thermal_zone *tz = to_zone(dev);
> >>> +
> >>> + if (!sscanf(attr->attr.name, "sensor%d_trip_critical", &indx))
> >>> + return -EINVAL;
> >>> +
> >>> + snprintf(kobj_name, THERMAL_NAME_LENGTH, "sensor%d", indx);
> >>> +
> >>> + mutex_lock(&tz->lock);
> >>> +
> >>> + indx = get_sensor_indx_by_kobj(tz, kobj_name);
> >>> + if (indx < 0) {
> >>> + mutex_unlock(&tz->lock);
> >>> + return indx;
> >>> + }
> >>> +
> >>> + val = tz->sensor_trip[indx]->crit;
> >>> + mutex_unlock(&tz->lock);
> >>> +
> >>> + return sprintf(buf, "%d\n", val);
> >>> +}
> >>> +
> >>> static DEVICE_ATTR(type, 0444, type_show, NULL);
> >>> static DEVICE_ATTR(temp, 0444, temp_show, NULL);
> >>> static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
> >>> @@ -962,7 +1127,8 @@ static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR,
> >> policy_show, policy_store);
> >>> static DEVICE_ATTR(sensor_name, 0444, sensor_name_show, NULL);
> >>> static DEVICE_ATTR(temp_input, 0444, sensor_temp_show, NULL);
> >>>
> >>> -static DEVICE_ATTR(zone_name, 0444, zone_name_show, NULL);
> >>> +/* Thermal zone attributes */
> >>> +static DEVICE_ATTR(zone_name, S_IRUGO, zone_name_show, NULL);
> >>>
> >>> /* sys I/F for cooling device */
> >>> #define to_cooling_device(_dev) \
> >>> @@ -1841,6 +2007,43 @@ static int enable_sensor_thresholds(struct
> >> thermal_sensor *ts, int count)
> >>> return 0;
> >>> }
> >>>
> >>> +static int create_single_trip_attr(struct thermal_zone *tz,
> >>> + struct thermal_attr *attr,
> >>> + const char *attr_name,
> >>> + ssize_t (*rd_ptr)(struct device *dev,
> >>> + struct device_attribute *devattr, char *buf))
> >>> +{
> >>> + snprintf(attr->name, THERMAL_NAME_LENGTH, attr_name);
> >>> + sysfs_attr_init(&attr->attr.attr);
> >>> + attr->attr.attr.name = attr->name;
> >>> + attr->attr.attr.mode = S_IRUGO;
> >>> + attr->attr.show = rd_ptr;
> >>> + return device_create_file(&tz->device, &attr->attr);
> >>> +}
> >>> +
> >>> +static int create_multi_trip_attrs(struct thermal_zone *tz, int size,
> >>> + int indx, struct thermal_attr *attrs,
> >>> + const char *attr_name,
> >>> + ssize_t (*rd_ptr)(struct device *dev,
> >>> + struct device_attribute *devattr, char *buf))
> >>> +{
> >>> + char name[THERMAL_NAME_LENGTH];
> >>> + int i, ret;
> >>> +
> >>> + for (i = 0; i < size; i++) {
> >>> + snprintf(name, THERMAL_NAME_LENGTH, attr_name, indx, i);
> >>> + ret = create_single_trip_attr(tz, &attrs[i], name, rd_ptr);
> >>> + if (ret)
> >>> + goto exit;
> >>> + }
> >>> + return 0;
> >>> +
> >>> +exit:
> >>> + while (--i >= 0)
> >>> + device_remove_file(&tz->device, &attrs[i].attr);
> >>> + return ret;
> >>> +}
> >>> +
> >>> /**
> >>> * create_thermal_zone - create sysfs nodes for thermal zone
> >>> * @name: Name of the thermla zone
> >>> @@ -2139,6 +2342,139 @@ exit_zone:
> >>> EXPORT_SYMBOL(add_cdev_to_zone);
> >>>
> >>> /**
> >>> + * add_sensor_trip_info - Add trip point information for @ts in @tz
> >>> + * @tz: Thermal zone reference
> >>> + * @ts: Thermal sensor reference
> >>> + * @trip: Trip point structure reference
> >>> + *
> >>> + * Returns 0 on success, otherwise
> >>> + * -EINVAL for invalid paramenters
> >>> + * -EINVAL if @ts is not part of 'this' thermal zone @tz
> >>> + * -ENOMEM on kzalloc failures
> >>> + */
> >>> +int add_sensor_trip_info(struct thermal_zone *tz, struct thermal_sensor
> *ts,
> >>> + struct thermal_trip_point *trip)
> >>> +{
> >>> + char name[THERMAL_NAME_LENGTH];
> >>> + int i, indx, kobj_indx, ret, size;
> >>> + struct thermal_trip_attr *attrs;
> >>> +
> >>> + if (!tz || !ts || !trip)
> >>> + return -EINVAL;
> >>> +
> >>> + if (!sscanf(kobject_name(&ts->device.kobj), "sensor%d", &kobj_indx))
> >>> + return -EINVAL;
> >>> +
> >>> + mutex_lock(&zone_list_lock);
> >>> +
> >>> + indx = GET_INDEX(tz, ts, sensor);
> >>> + if (indx < 0) {
> >>> + ret = -EINVAL;
> >>> + goto exit;
> >>> + }
> >>> +
> >>> + /* Protect against 'ts' being unregistered */
> >>> + mutex_lock(&sensor_list_lock);
> >>> +
> >>> + /* Protect tz->trip_attr[] and tz->sensor_trip[] */
> >>> + mutex_lock(&tz->lock);
> >>> +
> >>> + tz->trip_attr[indx] = kzalloc(sizeof(struct thermal_trip_attr),
> >>> + GFP_KERNEL);
> >>> + if (!tz->trip_attr[indx]) {
> >>> + ret = -ENOMEM;
> >>> + goto exit_lock;
> >>> + }
> >>> +
> >>> + attrs = tz->trip_attr[indx];
> >>> +
> >>> + /* Create Critical trip point attribute */
> >>> + if (trip->crit != THERMAL_TRIPS_NONE) {
> >>> + snprintf(name, THERMAL_NAME_LENGTH,
> >>> + "sensor%d_trip_critical", kobj_indx);
> >>> + ret = create_single_trip_attr(tz, &attrs->crit_attr,
> >>> + name, critical_trip_show);
> >>> + if (ret)
> >>> + goto exit_trip;
> >>> + }
> >>> +
> >>> + /* Create Hot trip point attribute */
> >>> + if (trip->hot != THERMAL_TRIPS_NONE) {
> >>> + snprintf(name, THERMAL_NAME_LENGTH,
> >>> + "sensor%d_trip_hot", kobj_indx);
> >>> + ret = create_single_trip_attr(tz, &attrs->hot_attr,
> >>> + name, hot_trip_show);
> >>> + if (ret)
> >>> + goto exit_crit_trip;
> >>> + }
> >>> +
> >>> + /* Create Passive trip point attributes */
> >>> + if (trip->num_passive_trips > 0) {
> >>> + size = sizeof(struct thermal_attr) * trip->num_passive_trips;
> >>> + attrs->passive_attrs = kzalloc(size, GFP_KERNEL);
> >>> + if (!attrs->passive_attrs) {
> >>> + ret = -ENOMEM;
> >>> + goto exit_hot_trip;
> >>> + }
> >>> +
> >>> + ret = create_multi_trip_attrs(tz, trip->num_passive_trips,
> >>> + kobj_indx, attrs->passive_attrs,
> >>> + "sensor%d_trip_passive%d",
> >> well, I do not think this is a good code style.
> >> I prefer to create the attrs one by one, rather than passing this ugly
> >> format string.
> >> please use create_single_trip_attr() instead if you can not find a clean
> >> way to do this.
> > Okay, Will change in next revision.
> >
> > Thanks,
> > Durga
> >
> >> thanks,
> >> rui
> >>> + passive_trip_show);
> >>> + if (ret)
> >>> + goto exit_hot_trip;
> >>> + }
> >>> +
> >>> + /* Create Active trip point attributes */
> >>> + if (trip->num_active_trips > 0) {
> >>> + size = sizeof(struct thermal_attr) * trip->num_active_trips;
> >>> + attrs->active_attrs = kzalloc(size, GFP_KERNEL);
> >>> + if (!attrs->active_attrs) {
> >>> + ret = -ENOMEM;
> >>> + goto exit_passive_trips;
> >>> + }
> >>> +
> >>> + ret = create_multi_trip_attrs(tz, trip->num_active_trips,
> >>> + kobj_indx, attrs->active_attrs,
> >>> + "sensor%d_trip_active%d",
> >>> + active_trip_show);
> >>> + if (ret)
> >>> + goto exit_passive_trips;
> >>> + }
> >>> +
> >>> + tz->sensor_trip[indx] = trip;
> >>> +
> >>> + mutex_unlock(&tz->lock);
> >>> + mutex_unlock(&sensor_list_lock);
> >>> + mutex_unlock(&zone_list_lock);
> >>> +
> >>> + return 0;
> >>> +
> >>> +exit_passive_trips:
> >>> + kfree(attrs->active_attrs);
> >>> + i = trip->num_passive_trips;
> >>> + while (--i >= 0)
> >>> + device_remove_file(&tz->device, &attrs->passive_attrs[i].attr);
> >>> +exit_hot_trip:
> >>> + kfree(attrs->passive_attrs);
> >>> + if (trip->hot != THERMAL_TRIPS_NONE)
> >>> + device_remove_file(&tz->device, &attrs->hot_attr.attr);
> >>> +exit_crit_trip:
> >>> + if (trip->crit != THERMAL_TRIPS_NONE)
> >>> + device_remove_file(&tz->device, &attrs->crit_attr.attr);
> >>> +exit_trip:
> >>> + kfree(tz->trip_attr[indx]);
> >>> + tz->trip_attr[indx] = NULL;
> >>> +exit_lock:
> >>> + mutex_unlock(&tz->lock);
> >>> + mutex_unlock(&sensor_list_lock);
> >>> +exit:
> >>> + mutex_unlock(&zone_list_lock);
> >>> + return ret;
> >>> +}
> >>> +EXPORT_SYMBOL(add_sensor_trip_info);
> >>> +
> >>> +/**
> >>> * thermal_sensor_register - register a new thermal sensor
> >>> * @name: name of the thermal sensor
> >>> * @count: Number of thresholds supported by hardware
> >>> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> >>> index da7520c..f8de86d 100644
> >>> --- a/include/linux/thermal.h
> >>> +++ b/include/linux/thermal.h
> >>> @@ -31,7 +31,7 @@
> >>>
> >>> #define THERMAL_TRIPS_NONE -1
> >>> #define THERMAL_MAX_TRIPS 12
> >>> -#define THERMAL_NAME_LENGTH 20
> >>> +#define THERMAL_NAME_LENGTH 25
> >>>
> >>> /* invalid cooling state */
> >>> #define THERMAL_CSTATE_INVALID -1UL
> >>> @@ -170,6 +170,37 @@ struct thermal_attr {
> >>> char name[THERMAL_NAME_LENGTH];
> >>> };
> >>>
> >>> +/*
> >>> + * This structure defines the trip points for a sensor.
> >>> + * The actual values for these trip points come from
> >>> + * platform characterization. The thermal governors
> >>> + * (either kernel or user space) may take appropriate
> >>> + * actions when the sensors reach these trip points.
> >>> + * See Documentation/thermal/sysfs-api2.txt for more details.
> >>> + *
> >>> + * As of now, For a particular sensor, we support:
> >>> + * a) 1 hot trip point
> >>> + * b) 1 critical trip point
> >>> + * c) 'n' passive trip points
> >>> + * d) 'm' active trip points
> >>> + */
> >>> +struct thermal_trip_point {
> >>> + int hot;
> >>> + int crit;
> >>> + int num_passive_trips;
> >>> + int *passive_trips;
> >>> + int num_active_trips;
> >>> + int *active_trips;
> >>> + int active_trip_mask;
> >>> +};
> >>> +
> >>> +struct thermal_trip_attr {
> >>> + struct thermal_attr hot_attr;
> >>> + struct thermal_attr crit_attr;
> >>> + struct thermal_attr *active_attrs;
> >>> + struct thermal_attr *passive_attrs;
> >>> +};
> >>> +
> >>> struct thermal_sensor {
> >>> char name[THERMAL_NAME_LENGTH];
> >>> int id;
> >>> @@ -229,6 +260,10 @@ struct thermal_zone {
> >>> /* cdev level information */
> >>> int cdev_indx; /* index into 'cdevs' array */
> >>> struct thermal_cooling_device *cdevs[MAX_CDEVS_PER_ZONE];
> >>> +
> >>> + /* Thermal sensors trip information */
> >>> + struct thermal_trip_point *sensor_trip[MAX_SENSORS_PER_ZONE];
> >>> + struct thermal_trip_attr *trip_attr[MAX_SENSORS_PER_ZONE];
> >>> };
> >>>
> >>> /* Structure that holds thermal governor information */
> >>> @@ -309,6 +344,9 @@ struct thermal_sensor *get_sensor_by_name(const
> >> char *);
> >>> int add_cdev_to_zone(struct thermal_zone *, struct
> thermal_cooling_device
> >> *);
> >>> struct thermal_cooling_device *get_cdev_by_name(const char *);
> >>>
> >>> +int add_sensor_trip_info(struct thermal_zone *, struct thermal_sensor *,
> >>> + struct thermal_trip_point *);
> >>> +
> >>> #ifdef CONFIG_NET
> >>> extern int thermal_generate_netlink_event(struct thermal_zone_device
> *tz,
> >>> enum events event);
> >
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> Z+ïï+zfïïïhïïï~ïïïïiïïïzïïwïïï?ïïïï&ï)ßfl===
>
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In reply to: Srinivas Pandruvada: "Re: [PATCHv4 5/9] Thermal: Add trip point sysfs nodes for sensor"
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