Hi,
this series is meant to add support for the new SCMI Sensor Protocol
features defined by the upcoming SCMIv3.0 specification, whose BETA
release is available at [1].
The series is currently based on for-next/scmi [2] on top of:
commit b9ceca6be432 ("firmware: arm_scmi: Fix duplicate workqueue name")
Any feedback welcome,
Thanks,
Cristian
---
v1 --> v2
- rebased on for-next/scmi v5.10
- restrict segmented intervals descriptors to single triplet
- add proper usage of scmi_reset_rx_to_maxsz
[1]:https://developer.arm.com/documentation/den0056/c/
[2]:https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux.git/log/?h=for-next/scmi
Cristian Marussi (6):
firmware: arm_scmi: rework scmi_sensors_protocol_init
firmware: arm_scmi: add SCMIv3.0 Sensors descriptors extensions
hwmon: scmi: update hwmon internal scale data type
firmware: arm_scmi: add SCMIv3.0 Sensors timestamped reads
firmware: arm_scmi: add SCMIv3.0 Sensor configuration support
firmware: arm_scmi: add SCMIv3.0 Sensor notifications
drivers/firmware/arm_scmi/sensors.c | 740 ++++++++++++++++++++++++++--
drivers/hwmon/scmi-hwmon.c | 2 +-
include/linux/scmi_protocol.h | 287 ++++++++++-
3 files changed, 974 insertions(+), 55 deletions(-)
--
2.17.1
Add support for new SCMIv3.0 Sensors extensions related to new sensors'
features, like multiple axis and update intervals, while keeping
compatibility with SCMIv2.0 features.
While at that, refactor and simplify all the internal helpers macros and
move struct scmi_sensor_info to use only non-fixed-size typing.
Signed-off-by: Cristian Marussi <[email protected]>
---
v1 --> v2
- restrict segmented intervals descriptors to single triplet
- add proper usage of scmi_reset_rx_to_maxsz
---
drivers/firmware/arm_scmi/sensors.c | 391 ++++++++++++++++++++++++++--
include/linux/scmi_protocol.h | 219 +++++++++++++++-
2 files changed, 584 insertions(+), 26 deletions(-)
diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
index 6aaff478d032..5a18f8c84bef 100644
--- a/drivers/firmware/arm_scmi/sensors.c
+++ b/drivers/firmware/arm_scmi/sensors.c
@@ -7,16 +7,21 @@
#define pr_fmt(fmt) "SCMI Notifications SENSOR - " fmt
+#include <linux/bitfield.h>
#include <linux/scmi_protocol.h>
#include "common.h"
#include "notify.h"
+#define SCMI_MAX_NUM_SENSOR_AXIS 64
+
enum scmi_sensor_protocol_cmd {
SENSOR_DESCRIPTION_GET = 0x3,
SENSOR_TRIP_POINT_NOTIFY = 0x4,
SENSOR_TRIP_POINT_CONFIG = 0x5,
SENSOR_READING_GET = 0x6,
+ SENSOR_AXIS_DESCRIPTION_GET = 0x7,
+ SENSOR_LIST_UPDATE_INTERVALS = 0x8,
};
struct scmi_msg_resp_sensor_attributes {
@@ -28,23 +33,102 @@ struct scmi_msg_resp_sensor_attributes {
__le32 reg_size;
};
+/* v3 attributes_low macros */
+#define SUPPORTS_UPDATE_NOTIFY(x) FIELD_GET(BIT(30), (x))
+#define SENSOR_TSTAMP_EXP(x) FIELD_GET(GENMASK(14, 10), (x))
+#define SUPPORTS_TIMESTAMP(x) FIELD_GET(BIT(9), (x))
+#define SUPPORTS_EXTEND_ATTRS(x) FIELD_GET(BIT(8), (x))
+
+/* v2 attributes_high macros */
+#define SENSOR_UPDATE_BASE(x) FIELD_GET(GENMASK(31, 27), (x))
+#define SENSOR_UPDATE_SCALE(x) FIELD_GET(GENMASK(26, 22), (x))
+
+/* v3 attributes_high macros */
+#define SENSOR_AXIS_NUMBER(x) FIELD_GET(GENMASK(21, 16), (x))
+#define SUPPORTS_AXIS(x) FIELD_GET(BIT(8), (x))
+
+/* v3 resolution macros */
+#define SENSOR_RES(x) FIELD_GET(GENMASK(26, 0), (x))
+#define SENSOR_RES_EXP(x) FIELD_GET(GENMASK(31, 27), (x))
+
+struct scmi_range_attrs_le {
+ __le32 min_range_low;
+ __le32 min_range_high;
+ __le32 max_range_low;
+ __le32 max_range_high;
+};
+
struct scmi_msg_resp_sensor_description {
__le16 num_returned;
__le16 num_remaining;
- struct {
+ struct scmi_sensor_descriptor {
__le32 id;
__le32 attributes_low;
-#define SUPPORTS_ASYNC_READ(x) ((x) & BIT(31))
-#define NUM_TRIP_POINTS(x) ((x) & 0xff)
+/* Common attributes_low macros */
+#define SUPPORTS_ASYNC_READ(x) FIELD_GET(BIT(31), (x))
+#define NUM_TRIP_POINTS(x) FIELD_GET(GENMASK(7, 0), (x))
__le32 attributes_high;
-#define SENSOR_TYPE(x) ((x) & 0xff)
-#define SENSOR_SCALE(x) (((x) >> 11) & 0x1f)
-#define SENSOR_SCALE_SIGN BIT(4)
-#define SENSOR_SCALE_EXTEND GENMASK(7, 5)
-#define SENSOR_UPDATE_SCALE(x) (((x) >> 22) & 0x1f)
-#define SENSOR_UPDATE_BASE(x) (((x) >> 27) & 0x1f)
- u8 name[SCMI_MAX_STR_SIZE];
- } desc[0];
+/* Common attributes_high macros */
+#define SENSOR_SCALE(x) FIELD_GET(GENMASK(15, 11), (x))
+#define SENSOR_SCALE_SIGN BIT(4)
+#define SENSOR_SCALE_EXTEND GENMASK(31, 5)
+#define SENSOR_TYPE(x) FIELD_GET(GENMASK(7, 0), (x))
+ u8 name[SCMI_MAX_STR_SIZE];
+ /* only for version > 2.0 */
+ __le32 power;
+ __le32 resolution;
+ struct scmi_range_attrs_le scalar_attrs;
+ } desc[];
+};
+
+/* Sign extend to a full s32 */
+#define S32_EXT(v) \
+ ({ \
+ int __v = (v); \
+ \
+ if (__v & SENSOR_SCALE_SIGN) \
+ __v |= SENSOR_SCALE_EXTEND; \
+ __v; \
+ })
+
+#define SCMI_MSG_RESP_SENS_DESCR_BASE_SZ \
+ (sizeof(struct scmi_sensor_descriptor) - \
+ (2 * sizeof(__le32)) - sizeof(struct scmi_range_attrs_le))
+
+struct scmi_msg_sensor_axis_description_get {
+ __le32 id;
+ __le32 axis_desc_index;
+};
+
+struct scmi_msg_resp_sensor_axis_description {
+ __le32 num_axis_flags;
+#define NUM_AXIS_RETURNED(x) FIELD_GET(GENMASK(5, 0), (x))
+#define NUM_AXIS_REMAINING(x) FIELD_GET(GENMASK(31, 26), (x))
+ struct scmi_axis_descriptor {
+ __le32 id;
+ __le32 attributes_low;
+ __le32 attributes_high;
+ u8 name[SCMI_MAX_STR_SIZE];
+ __le32 resolution;
+ struct scmi_range_attrs_le attrs;
+ } desc[];
+};
+
+#define SCMI_MSG_RESP_AXIS_DESCR_BASE_SZ \
+ (sizeof(struct scmi_axis_descriptor) - \
+ sizeof(__le32) - sizeof(struct scmi_range_attrs_le))
+
+struct scmi_msg_sensor_list_update_intervals {
+ __le32 id;
+ __le32 index;
+};
+
+struct scmi_msg_resp_sensor_list_update_intervals {
+ __le32 num_intervals_flags;
+#define NUM_INTERVALS_RETURNED(x) FIELD_GET(GENMASK(11, 0), (x))
+#define SEGMENTED_INTVL_FORMAT(x) FIELD_GET(BIT(12), (x))
+#define NUM_INTERVALS_REMAINING(x) FIELD_GET(GENMASK(31, 16), (x))
+ __le32 intervals[];
};
struct scmi_msg_sensor_trip_point_notify {
@@ -114,6 +198,194 @@ static int scmi_sensor_attributes_get(const struct scmi_handle *handle,
return ret;
}
+static inline void scmi_parse_range_attrs(struct scmi_range_attrs *out,
+ struct scmi_range_attrs_le *in)
+{
+ out->min_range = get_unaligned_le64((void *)&in->min_range_low);
+ out->max_range = get_unaligned_le64((void *)&in->max_range_low);
+}
+
+static int scmi_sensor_update_intervals(const struct scmi_handle *handle,
+ struct scmi_sensor_info *s)
+{
+ int ret, cnt;
+ u32 desc_index = 0;
+ u16 num_returned, num_remaining;
+ struct scmi_xfer *ti;
+ struct scmi_msg_resp_sensor_list_update_intervals *buf;
+ struct scmi_msg_sensor_list_update_intervals *msg;
+
+ ret = scmi_xfer_get_init(handle, SENSOR_LIST_UPDATE_INTERVALS,
+ SCMI_PROTOCOL_SENSOR, sizeof(*msg), 0, &ti);
+ if (ret)
+ return ret;
+
+ buf = ti->rx.buf;
+ do {
+ u32 flags;
+
+ msg = ti->tx.buf;
+ /* Set the number of sensors to be skipped/already read */
+ msg->id = cpu_to_le32(s->id);
+ msg->index = cpu_to_le32(desc_index);
+
+ ret = scmi_do_xfer(handle, ti);
+ if (ret)
+ break;
+
+ flags = le32_to_cpu(buf->num_intervals_flags);
+ num_returned = NUM_INTERVALS_RETURNED(flags);
+ num_remaining = NUM_INTERVALS_REMAINING(flags);
+
+ /*
+ * Max intervals is not declared previously anywhere so we
+ * assume it's returned+remaining.
+ */
+ if (!s->intervals.count) {
+ s->intervals.segmented = SEGMENTED_INTVL_FORMAT(flags);
+ s->intervals.count = num_returned + num_remaining;
+ /* segmented intervals are reported in one triplet */
+ if (s->intervals.segmented &&
+ (num_remaining || num_returned != 3)) {
+ dev_err(handle->dev,
+ "Sensor ID:%d advertises an invalid segmented interval (%d)\n",
+ s->id, s->intervals.count);
+ s->intervals.segmented = false;
+ s->intervals.count = 0;
+ ret = -EINVAL;
+ break;
+ }
+ /* Direct allocation when exceeding pre-allocated */
+ if (s->intervals.count >= SCMI_MAX_PREALLOC_POOL) {
+ s->intervals.desc =
+ devm_kcalloc(handle->dev,
+ s->intervals.count,
+ sizeof(*s->intervals.desc),
+ GFP_KERNEL);
+ if (!s->intervals.desc) {
+ s->intervals.segmented = false;
+ s->intervals.count = 0;
+ ret = -ENOMEM;
+ break;
+ }
+ }
+ } else if (desc_index + num_returned > s->intervals.count) {
+ dev_err(handle->dev,
+ "No. of update intervals can't exceed %d\n",
+ s->intervals.count);
+ ret = -EINVAL;
+ break;
+ }
+
+ for (cnt = 0; cnt < num_returned; cnt++)
+ s->intervals.desc[desc_index + cnt] =
+ le32_to_cpu(buf->intervals[cnt]);
+
+ desc_index += num_returned;
+
+ scmi_reset_rx_to_maxsz(handle, ti);
+ /*
+ * check for both returned and remaining to avoid infinite
+ * loop due to buggy firmware
+ */
+ } while (num_returned && num_remaining);
+
+ scmi_xfer_put(handle, ti);
+ return ret;
+}
+
+static int scmi_sensor_axis_description(const struct scmi_handle *handle,
+ struct scmi_sensor_info *s)
+{
+ int ret, cnt;
+ u32 desc_index = 0;
+ u16 num_returned, num_remaining;
+ struct scmi_xfer *te;
+ struct scmi_msg_resp_sensor_axis_description *buf;
+ struct scmi_msg_sensor_axis_description_get *msg;
+
+ s->axis = devm_kcalloc(handle->dev, s->num_axis,
+ sizeof(*s->axis), GFP_KERNEL);
+ if (!s->axis)
+ return -ENOMEM;
+
+ ret = scmi_xfer_get_init(handle, SENSOR_AXIS_DESCRIPTION_GET,
+ SCMI_PROTOCOL_SENSOR, sizeof(*msg), 0, &te);
+ if (ret)
+ return ret;
+
+ buf = te->rx.buf;
+ do {
+ u32 flags;
+ struct scmi_axis_descriptor *adesc;
+
+ msg = te->tx.buf;
+ /* Set the number of sensors to be skipped/already read */
+ msg->id = cpu_to_le32(s->id);
+ msg->axis_desc_index = cpu_to_le32(desc_index);
+
+ ret = scmi_do_xfer(handle, te);
+ if (ret)
+ break;
+
+ flags = le32_to_cpu(buf->num_axis_flags);
+ num_returned = NUM_AXIS_RETURNED(flags);
+ num_remaining = NUM_AXIS_REMAINING(flags);
+
+ if (desc_index + num_returned > s->num_axis) {
+ dev_err(handle->dev, "No. of axis can't exceed %d\n",
+ s->num_axis);
+ break;
+ }
+
+ adesc = &buf->desc[0];
+ for (cnt = 0; cnt < num_returned; cnt++) {
+ u32 attrh, attrl;
+ struct scmi_sensor_axis_info *a;
+ size_t dsize = SCMI_MSG_RESP_AXIS_DESCR_BASE_SZ;
+
+ attrl = le32_to_cpu(adesc->attributes_low);
+
+ a = &s->axis[desc_index + cnt];
+
+ a->id = le32_to_cpu(adesc->id);
+ a->extended_attrs = SUPPORTS_EXTEND_ATTRS(attrl);
+
+ attrh = le32_to_cpu(adesc->attributes_high);
+ a->scale = S32_EXT(SENSOR_SCALE(attrh));
+ a->type = SENSOR_TYPE(attrh);
+ strlcpy(a->name, adesc->name, SCMI_MAX_STR_SIZE);
+
+ if (a->extended_attrs) {
+ unsigned int ares =
+ le32_to_cpu(adesc->resolution);
+
+ a->resolution = SENSOR_RES(ares);
+ a->exponent =
+ S32_EXT(SENSOR_RES_EXP(ares));
+ dsize += sizeof(adesc->resolution);
+
+ scmi_parse_range_attrs(&a->attrs,
+ &adesc->attrs);
+ dsize += sizeof(adesc->attrs);
+ }
+
+ adesc = (typeof(adesc))((u8 *)adesc + dsize);
+ }
+
+ desc_index += num_returned;
+
+ scmi_reset_rx_to_maxsz(handle, te);
+ /*
+ * check for both returned and remaining to avoid infinite
+ * loop due to buggy firmware
+ */
+ } while (num_returned && num_remaining);
+
+ scmi_xfer_put(handle, te);
+ return ret;
+}
+
static int scmi_sensor_description_get(const struct scmi_handle *handle,
struct sensors_info *si)
{
@@ -131,9 +403,10 @@ static int scmi_sensor_description_get(const struct scmi_handle *handle,
buf = t->rx.buf;
do {
+ struct scmi_sensor_descriptor *sdesc;
+
/* Set the number of sensors to be skipped/already read */
put_unaligned_le32(desc_index, t->tx.buf);
-
ret = scmi_do_xfer(handle, t);
if (ret)
break;
@@ -147,22 +420,97 @@ static int scmi_sensor_description_get(const struct scmi_handle *handle,
break;
}
+ sdesc = &buf->desc[0];
for (cnt = 0; cnt < num_returned; cnt++) {
u32 attrh, attrl;
struct scmi_sensor_info *s;
+ size_t dsize = SCMI_MSG_RESP_SENS_DESCR_BASE_SZ;
- attrl = le32_to_cpu(buf->desc[cnt].attributes_low);
- attrh = le32_to_cpu(buf->desc[cnt].attributes_high);
s = &si->sensors[desc_index + cnt];
- s->id = le32_to_cpu(buf->desc[cnt].id);
- s->type = SENSOR_TYPE(attrh);
- s->scale = SENSOR_SCALE(attrh);
- /* Sign extend to a full s8 */
- if (s->scale & SENSOR_SCALE_SIGN)
- s->scale |= SENSOR_SCALE_EXTEND;
+ s->id = le32_to_cpu(sdesc->id);
+
+ attrl = le32_to_cpu(sdesc->attributes_low);
+ /* common bitfields parsing */
s->async = SUPPORTS_ASYNC_READ(attrl);
s->num_trip_points = NUM_TRIP_POINTS(attrl);
- strlcpy(s->name, buf->desc[cnt].name, SCMI_MAX_STR_SIZE);
+ /**
+ * only v3.0 specific bitfield below.
+ * Such bitfields are assumed to be zeroed on non
+ * relevant fw versions...assuming fw not buggy !
+ */
+ s->update = SUPPORTS_UPDATE_NOTIFY(attrl);
+ s->timestamped = SUPPORTS_TIMESTAMP(attrl);
+ if (s->timestamped)
+ s->tstamp_scale =
+ S32_EXT(SENSOR_TSTAMP_EXP(attrl));
+ s->extended_scalar_attrs =
+ SUPPORTS_EXTEND_ATTRS(attrl);
+
+ attrh = le32_to_cpu(sdesc->attributes_high);
+ /* common bitfields parsing */
+ s->scale = S32_EXT(SENSOR_SCALE(attrh));
+ s->type = SENSOR_TYPE(attrh);
+ /* Use pre-allocated pool wherever possible */
+ s->intervals.desc = s->intervals.prealloc_pool;
+ if (si->version == 0x10000) {
+ s->intervals.segmented = false;
+ s->intervals.count = 1;
+ /*
+ * Convert SCMIv2.0 update interval format to
+ * SCMIv3.0 to be used as the common exposed
+ * descriptor, accessible via common macros.
+ */
+ s->intervals.desc[0] =
+ (SENSOR_UPDATE_BASE(attrh) << 5) |
+ SENSOR_UPDATE_SCALE(attrh);
+ } else {
+ /*
+ * From version v3.0 update intervals are
+ * retrieved via a dedicated (optional) command.
+ * Since the command is optional, on error carry
+ * on without any update interval.
+ */
+ if (scmi_sensor_update_intervals(handle, s))
+ dev_info(handle->dev,
+ "Update Intervals not available for sensor ID:%d\n",
+ s->id);
+ }
+ /**
+ * only > v2.0 specific bitfield below.
+ * Such bitfields are assumed to be zeroed on non
+ * relevant fw versions...assuming fw not buggy !
+ */
+ s->num_axis = min_t(unsigned int,
+ SUPPORTS_AXIS(attrh) ?
+ SENSOR_AXIS_NUMBER(attrh) : 0,
+ SCMI_MAX_NUM_SENSOR_AXIS);
+ strlcpy(s->name, sdesc->name, SCMI_MAX_STR_SIZE);
+
+ if (s->extended_scalar_attrs) {
+ s->sensor_power = le32_to_cpu(sdesc->power);
+ dsize += sizeof(sdesc->power);
+ /* Only for sensors reporting scalar values */
+ if (s->num_axis == 0) {
+ unsigned int sres =
+ le32_to_cpu(sdesc->resolution);
+
+ s->resolution = SENSOR_RES(sres);
+ s->exponent =
+ S32_EXT(SENSOR_RES_EXP(sres));
+ dsize += sizeof(sdesc->resolution);
+
+ scmi_parse_range_attrs(&s->scalar_attrs,
+ &sdesc->scalar_attrs);
+ dsize += sizeof(sdesc->scalar_attrs);
+ }
+ }
+ if (s->num_axis > 0) {
+ ret = scmi_sensor_axis_description(handle, s);
+ if (ret)
+ goto out;
+ }
+
+ sdesc = (typeof(sdesc))((u8 *)sdesc + dsize);
}
desc_index += num_returned;
@@ -174,6 +522,7 @@ static int scmi_sensor_description_get(const struct scmi_handle *handle,
*/
} while (num_returned && num_remaining);
+out:
scmi_xfer_put(handle, t);
return ret;
}
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 9cd312a1ff92..1f5c52a460bb 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -8,6 +8,7 @@
#ifndef _LINUX_SCMI_PROTOCOL_H
#define _LINUX_SCMI_PROTOCOL_H
+#include <linux/bitfield.h>
#include <linux/device.h>
#include <linux/notifier.h>
#include <linux/types.h>
@@ -148,26 +149,234 @@ struct scmi_power_ops {
u32 *state);
};
+/**
+ * scmi_range_attrs - specifies a sensor or axis values' range
+ * @min_range: The minimum value which can be represented by the sensor/axis.
+ * @max_range: The maximum value which can be represented by the sensor/axis.
+ */
+struct scmi_range_attrs {
+ long long min_range;
+ long long max_range;
+};
+
+/**
+ * scmi_sensor_axis_info - describes one sensor axes
+ * @id: The axes ID.
+ * @type: Axes type. Chosen amongst one of @enum scmi_sensor_class.
+ * @scale: Power-of-10 multiplier applied to the axis unit.
+ * @name: NULL-terminated string representing axes name as advertised by
+ * SCMI platform.
+ * @extended_attrs: Flag to indicate the presence of additional extended
+ * attributes for this axes.
+ * @resolution: Extended attribute representing the resolution of the axes.
+ * Set to 0 if not reported by this axes.
+ * @exponent: Extended attribute representing the power-of-10 multiplier that
+ * is applied to the resolution field. Set to 0 if not reported by
+ * this axes.
+ * @attrs: Extended attributes representing minimum and maximum values
+ * measurable by this axes. Set to 0 if not reported by this sensor.
+ */
+struct scmi_sensor_axis_info {
+ unsigned int id;
+ unsigned int type;
+ int scale;
+ char name[SCMI_MAX_STR_SIZE];
+ bool extended_attrs;
+ unsigned int resolution;
+ int exponent;
+ struct scmi_range_attrs attrs;
+};
+
+/**
+ * scmi_sensor_intervals_info - describes number and type of available update
+ * intervals
+ * @segmented: Flag for segmented intervals' representation. When True there
+ * will be exactly 3 intervals in @desc, with each entry
+ * representing a member of a segment in this order:
+ * {lowest update interval, highest update interval, step size}
+ * @count: Number of intervals described in @desc.
+ * @desc: Array of @count interval descriptor bitmask represented as detailed in
+ * the SCMI specification: it can be accessed using the accompanying
+ * macros.
+ * @prealloc_pool: A minimal preallocated pool of desc entries used to avoid
+ * lesser-than-64-bytes dynamic allocation for small @count
+ * values.
+ */
+struct scmi_sensor_intervals_info {
+ bool segmented;
+ unsigned int count;
+ unsigned int *desc;
+#define SCMI_SENS_INTVL_GET_SECS(x) FIELD_GET(GENMASK(20, 5), (x))
+#define SCMI_SENS_INTVL_GET_EXP(x) \
+ ({ \
+ int __signed_exp = FIELD_GET(GENMASK(4, 0), (x)); \
+ \
+ if (__signed_exp & BIT(4)) \
+ __signed_exp |= GENMASK(31, 5); \
+ __signed_exp; \
+ })
+#define SCMI_MAX_PREALLOC_POOL 16
+ unsigned int prealloc_pool[SCMI_MAX_PREALLOC_POOL];
+};
+
+/**
+ * struct scmi_sensor_info - represents information related to one of the
+ * available sensors.
+ * @id: Sensor ID.
+ * @type: Sensor type. Chosen amongst one of @enum scmi_sensor_class.
+ * @scale: Power-of-10 multiplier applied to the sensor unit.
+ * @num_trip_points: Number of maximum configurable trip points.
+ * @async: Flag for asynchronous read support.
+ * @update: Flag for continuouos update notification support.
+ * @timestamped: Flag for timestamped read support.
+ * @tstamp_scale: Power-of-10 multiplier applied to the sensor timestamps to
+ * represent it in seconds.
+ * @num_axis: Number of supported axis if any. Reported as 0 for scalar sensors.
+ * @axis: Pointer to an array of @num_axis descriptors.
+ * @intervals: Descriptor of available update intervals.
+ * @sensor_config: A bitmask reporting the current sensor configuration as
+ * detailed in the SCMI specification: it can accessed and
+ * modified through the accompanying macros.
+ * @name: NULL-terminated string representing sensor name as advertised by
+ * SCMI platform.
+ * @extended_scalar_attrs: Flag to indicate the presence of additional extended
+ * attributes for this sensor.
+ * @sensor_power: Extended attribute representing the average power
+ * consumed by the sensor in microwatts (uW) when it is active.
+ * Reported here only for scalar sensors.
+ * Set to 0 if not reported by this sensor.
+ * @resolution: Extended attribute representing the resolution of the sensor.
+ * Set to 0 if not reported by this sensor.
+ * @exponent: Extended attribute representing the power-of-10 multiplier that is
+ * applied to the resolution field.
+ * Reported here only for scalar sensors.
+ * Set to 0 if not reported by this sensor.
+ * @scalar_attrs: Extended attributes representing minimum and maximum
+ * measurable values by this sensor.
+ * Reported here only for scalar sensors.
+ * Set to 0 if not reported by this sensor.
+ */
struct scmi_sensor_info {
- u32 id;
- u8 type;
- s8 scale;
- u8 num_trip_points;
+ unsigned int id;
+ unsigned int type;
+ int scale;
+ unsigned int num_trip_points;
bool async;
+ bool update;
+ bool timestamped;
+ int tstamp_scale;
+ unsigned int num_axis;
+ struct scmi_sensor_axis_info *axis;
+ struct scmi_sensor_intervals_info intervals;
char name[SCMI_MAX_STR_SIZE];
+ bool extended_scalar_attrs;
+ unsigned int sensor_power;
+ unsigned int resolution;
+ int exponent;
+ struct scmi_range_attrs scalar_attrs;
};
/*
* Partial list from Distributed Management Task Force (DMTF) specification:
- * DSP0249 (Platform Level Data Model specification)
+ * DSP0248 (Platform Level Data Model for Platform Monitoring and Control
+ * specification)
*/
enum scmi_sensor_class {
NONE = 0x0,
+ UNSPEC = 0x1,
TEMPERATURE_C = 0x2,
+ TEMPERATURE_F = 0x3,
+ TEMPERATURE_K = 0x4,
VOLTAGE = 0x5,
CURRENT = 0x6,
POWER = 0x7,
ENERGY = 0x8,
+ CHARGE = 0x9,
+ VOLTAMPERE = 0xA,
+ NITS = 0xB,
+ LUMENS = 0xC,
+ LUX = 0xD,
+ CANDELAS = 0xE,
+ KPA = 0xF,
+ PSI = 0x10,
+ NEWTON = 0x11,
+ CFM = 0x12,
+ RPM = 0x13,
+ HERTZ = 0x14,
+ SECS = 0x15,
+ MINS = 0x16,
+ HOURS = 0x17,
+ DAYS = 0x18,
+ WEEKS = 0x19,
+ MILS = 0x1A,
+ INCHES = 0x1B,
+ FEET = 0x1C,
+ CUBIC_INCHES = 0x1D,
+ CUBIC_FEET = 0x1E,
+ METERS = 0x1F,
+ CUBIC_CM = 0x20,
+ CUBIC_METERS = 0x21,
+ LITERS = 0x22,
+ FLUID_OUNCES = 0x23,
+ RADIANS = 0x24,
+ STERADIANS = 0x25,
+ REVOLUTIONS = 0x26,
+ CYCLES = 0x27,
+ GRAVITIES = 0x28,
+ OUNCES = 0x29,
+ POUNDS = 0x2A,
+ FOOT_POUNDS = 0x2B,
+ OUNCE_INCHES = 0x2C,
+ GAUSS = 0x2D,
+ GILBERTS = 0x2E,
+ HENRIES = 0x2F,
+ FARADS = 0x30,
+ OHMS = 0x31,
+ SIEMENS = 0x32,
+ MOLES = 0x33,
+ BECQUERELS = 0x34,
+ PPM = 0x35,
+ DECIBELS = 0x36,
+ DBA = 0x37,
+ DBC = 0x38,
+ GRAYS = 0x39,
+ SIEVERTS = 0x3A,
+ COLOR_TEMP_K = 0x3B,
+ BITS = 0x3C,
+ BYTES = 0x3D,
+ WORDS = 0x3E,
+ DWORDS = 0x3F,
+ QWORDS = 0x40,
+ PERCENTAGE = 0x41,
+ PASCALS = 0x42,
+ COUNTS = 0x43,
+ GRAMS = 0x44,
+ NEWTON_METERS = 0x45,
+ HITS = 0x46,
+ MISSES = 0x47,
+ RETRIES = 0x48,
+ OVERRUNS = 0x49,
+ UNDERRUNS = 0x4A,
+ COLLISIONS = 0x4B,
+ PACKETS = 0x4C,
+ MESSAGES = 0x4D,
+ CHARS = 0x4E,
+ ERRORS = 0x4F,
+ CORRECTED_ERRS = 0x50,
+ UNCORRECTABLE_ERRS = 0x51,
+ SQ_MILS = 0x52,
+ SQ_INCHES = 0x53,
+ SQ_FEET = 0x54,
+ SQ_CM = 0x55,
+ SQ_METERS = 0x56,
+ RADIANS_SEC = 0x57,
+ BPM = 0x58,
+ METERS_SEC_SQUARED = 0x59,
+ METERS_SEC = 0x5A,
+ CUBIC_METERS_SEC = 0x5B,
+ MM_MERCURY = 0x5C,
+ RADIANS_SEC_SQUARED = 0x5D,
+ OEM_UNIT = 0xFF
};
/**
--
2.17.1
Add SCMIv3.0 Sensor support for CONFIG_GET/CONFIG_SET commands.
Signed-off-by: Cristian Marussi <[email protected]>
---
drivers/firmware/arm_scmi/sensors.c | 75 +++++++++++++++++++++++++++++
include/linux/scmi_protocol.h | 37 ++++++++++++++
2 files changed, 112 insertions(+)
diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
index bdb0ed0df683..372a3592e99b 100644
--- a/drivers/firmware/arm_scmi/sensors.c
+++ b/drivers/firmware/arm_scmi/sensors.c
@@ -22,6 +22,8 @@ enum scmi_sensor_protocol_cmd {
SENSOR_READING_GET = 0x6,
SENSOR_AXIS_DESCRIPTION_GET = 0x7,
SENSOR_LIST_UPDATE_INTERVALS = 0x8,
+ SENSOR_CONFIG_GET = 0x9,
+ SENSOR_CONFIG_SET = 0xA,
};
struct scmi_msg_resp_sensor_attributes {
@@ -150,6 +152,19 @@ struct scmi_msg_set_sensor_trip_point {
__le32 value_high;
};
+struct scmi_msg_sensor_config_get {
+ __le32 id;
+};
+
+struct scmi_resp_sensor_config_get {
+ __le32 sensor_config;
+};
+
+struct scmi_msg_sensor_config_set {
+ __le32 id;
+ __le32 sensor_config;
+};
+
struct scmi_msg_sensor_reading_get {
__le32 id;
__le32 flags;
@@ -597,6 +612,64 @@ scmi_sensor_trip_point_config(const struct scmi_handle *handle, u32 sensor_id,
return ret;
}
+static int scmi_sensor_config_get(const struct scmi_handle *handle,
+ u32 sensor_id, u32 *sensor_config)
+{
+ int ret;
+ struct scmi_xfer *t;
+ struct scmi_msg_sensor_config_get *msg;
+ struct scmi_resp_sensor_config_get *resp;
+
+ ret = scmi_xfer_get_init(handle, SENSOR_CONFIG_GET,
+ SCMI_PROTOCOL_SENSOR, sizeof(*msg),
+ sizeof(*resp), &t);
+ if (ret)
+ return ret;
+
+ msg = t->tx.buf;
+ msg->id = cpu_to_le32(sensor_id);
+ ret = scmi_do_xfer(handle, t);
+ if (!ret) {
+ struct sensors_info *si = handle->sensor_priv;
+ struct scmi_sensor_info *s = si->sensors + sensor_id;
+
+ resp = t->rx.buf;
+ *sensor_config = le32_to_cpu(resp->sensor_config);
+ s->sensor_config = *sensor_config;
+ }
+
+ scmi_xfer_put(handle, t);
+ return ret;
+}
+
+static int scmi_sensor_config_set(const struct scmi_handle *handle,
+ u32 sensor_id, u32 sensor_config)
+{
+ int ret;
+ struct scmi_xfer *t;
+ struct scmi_msg_sensor_config_set *msg;
+
+ ret = scmi_xfer_get_init(handle, SENSOR_CONFIG_SET,
+ SCMI_PROTOCOL_SENSOR, sizeof(*msg), 0, &t);
+ if (ret)
+ return ret;
+
+ msg = t->tx.buf;
+ msg->id = cpu_to_le32(sensor_id);
+ msg->sensor_config = cpu_to_le32(sensor_config);
+
+ ret = scmi_do_xfer(handle, t);
+ if (!ret) {
+ struct sensors_info *si = handle->sensor_priv;
+ struct scmi_sensor_info *s = si->sensors + sensor_id;
+
+ s->sensor_config = sensor_config;
+ }
+
+ scmi_xfer_put(handle, t);
+ return ret;
+}
+
/**
* scmi_sensor_reading_get - Read scalar sensor value
* @handle: Platform handle
@@ -755,6 +828,8 @@ static const struct scmi_sensor_ops sensor_ops = {
.trip_point_config = scmi_sensor_trip_point_config,
.reading_get = scmi_sensor_reading_get,
.reading_get_timestamped = scmi_sensor_reading_get_timestamped,
+ .config_get = scmi_sensor_config_get,
+ .config_set = scmi_sensor_config_set,
};
static int scmi_sensor_set_notify_enabled(const struct scmi_handle *handle,
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 24d5b7ebf508..6f39ffa638b7 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -282,7 +282,38 @@ struct scmi_sensor_info {
unsigned int num_axis;
struct scmi_sensor_axis_info *axis;
struct scmi_sensor_intervals_info intervals;
+ unsigned int sensor_config;
+#define SCMI_SENS_CFG_UPDATE_SECS_MASK GENMASK(31, 16)
+#define SCMI_SENS_CFG_GET_UPDATE_SECS(x) \
+ FIELD_GET(SCMI_SENS_CFG_UPDATE_SECS_MASK, (x))
+
+#define SCMI_SENS_CFG_UPDATE_EXP_MASK GENMASK(15, 11)
+#define SCMI_SENS_CFG_GET_UPDATE_EXP(x) \
+ ({ \
+ int __signed_exp = \
+ FIELD_GET(SCMI_SENS_CFG_UPDATE_EXP_MASK, (x)); \
+ \
+ if (__signed_exp & BIT(4)) \
+ __signed_exp |= GENMASK(31, 5); \
+ __signed_exp; \
+ })
+
+#define SCMI_SENS_CFG_ROUND_MASK GENMASK(10, 9)
+#define SCMI_SENS_CFG_ROUND_AUTO 2
+#define SCMI_SENS_CFG_ROUND_UP 1
+#define SCMI_SENS_CFG_ROUND_DOWN 0
+
+#define SCMI_SENS_CFG_TSTAMP_ENABLED_MASK BIT(1)
+#define SCMI_SENS_CFG_TSTAMP_ENABLE 1
+#define SCMI_SENS_CFG_TSTAMP_DISABLE 0
+#define SCMI_SENS_CFG_IS_TSTAMP_ENABLED(x) \
+ FIELD_GET(SCMI_SENS_CFG_TSTAMP_ENABLED_MASK, (x))
+
+#define SCMI_SENS_CFG_SENSOR_ENABLED_MASK BIT(0)
+#define SCMI_SENS_CFG_SENSOR_ENABLE 1
+#define SCMI_SENS_CFG_SENSOR_DISABLE 0
char name[SCMI_MAX_STR_SIZE];
+#define SCMI_SENS_CFG_IS_ENABLED(x) FIELD_GET(BIT(0), (x))
bool extended_scalar_attrs;
unsigned int sensor_power;
unsigned int resolution;
@@ -406,6 +437,8 @@ enum scmi_sensor_class {
* Supports multi-axis sensors for sensors which
* supports it and if the @reading array size of
* @count entry equals the sensor num_axis
+ * @config_get: Get sensor current configuration
+ * @config_set: Set sensor current configuration
*/
struct scmi_sensor_ops {
int (*count_get)(const struct scmi_handle *handle);
@@ -418,6 +451,10 @@ struct scmi_sensor_ops {
int (*reading_get_timestamped)(const struct scmi_handle *handle,
u32 sensor_id, u8 count,
struct scmi_sensor_reading *readings);
+ int (*config_get)(const struct scmi_handle *handle,
+ u32 sensor_id, u32 *sensor_config);
+ int (*config_set)(const struct scmi_handle *handle,
+ u32 sensor_id, u32 sensor_config);
};
/**
--
2.17.1
Use an int to calculate scale values inside scmi_hwmon_scale() to match
the updated scale data type in struct scmi_sensor_info.
Signed-off-by: Cristian Marussi <[email protected]>
---
drivers/hwmon/scmi-hwmon.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwmon/scmi-hwmon.c b/drivers/hwmon/scmi-hwmon.c
index d421e691318b..e190abc5749a 100644
--- a/drivers/hwmon/scmi-hwmon.c
+++ b/drivers/hwmon/scmi-hwmon.c
@@ -30,7 +30,7 @@ static inline u64 __pow10(u8 x)
static int scmi_hwmon_scale(const struct scmi_sensor_info *sensor, u64 *value)
{
- s8 scale = sensor->scale;
+ int scale = sensor->scale;
u64 f;
switch (sensor->type) {
--
2.17.1
On 26.10.20 21:10, Cristian Marussi wrote:
> Add support for new SCMIv3.0 Sensors extensions related to new sensors'
> features, like multiple axis and update intervals, while keeping
> compatibility with SCMIv2.0 features.
> While at that, refactor and simplify all the internal helpers macros and
> move struct scmi_sensor_info to use only non-fixed-size typing.
>
> Signed-off-by: Cristian Marussi <[email protected]>
> ---
> v1 --> v2
> - restrict segmented intervals descriptors to single triplet
> - add proper usage of scmi_reset_rx_to_maxsz
> ---
> drivers/firmware/arm_scmi/sensors.c | 391 ++++++++++++++++++++++++++--
> include/linux/scmi_protocol.h | 219 +++++++++++++++-
> 2 files changed, 584 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
> index 6aaff478d032..5a18f8c84bef 100644
> --- a/drivers/firmware/arm_scmi/sensors.c
> +++ b/drivers/firmware/arm_scmi/sensors.c
> @@ -7,16 +7,21 @@
>
> #define pr_fmt(fmt) "SCMI Notifications SENSOR - " fmt
>
> +#include <linux/bitfield.h>
> #include <linux/scmi_protocol.h>
>
> #include "common.h"
> #include "notify.h"
>
> +#define SCMI_MAX_NUM_SENSOR_AXIS 64
IMHO the related 6 bit wide fields, like SENSOR_DESCRIPTION_GET "Number
of axes", should determine the maximum value, so 64 -> 63.
[...]
> +
> +/**
> + * struct scmi_sensor_info - represents information related to one of the
> + * available sensors.
> + * @id: Sensor ID.
> + * @type: Sensor type. Chosen amongst one of @enum scmi_sensor_class.
> + * @scale: Power-of-10 multiplier applied to the sensor unit.
> + * @num_trip_points: Number of maximum configurable trip points.
> + * @async: Flag for asynchronous read support.
> + * @update: Flag for continuouos update notification support.
> + * @timestamped: Flag for timestamped read support.
> + * @tstamp_scale: Power-of-10 multiplier applied to the sensor timestamps to
> + * represent it in seconds.
> + * @num_axis: Number of supported axis if any. Reported as 0 for scalar sensors.
> + * @axis: Pointer to an array of @num_axis descriptors.
> + * @intervals: Descriptor of available update intervals.
> + * @sensor_config: A bitmask reporting the current sensor configuration as
> + * detailed in the SCMI specification: it can accessed and
> + * modified through the accompanying macros.
> + * @name: NULL-terminated string representing sensor name as advertised by
> + * SCMI platform.
> + * @extended_scalar_attrs: Flag to indicate the presence of additional extended
> + * attributes for this sensor.
> + * @sensor_power: Extended attribute representing the average power
> + * consumed by the sensor in microwatts (uW) when it is active.
> + * Reported here only for scalar sensors.
Above line should go to @resolution below.
Best regards,
Peter
> + * Set to 0 if not reported by this sensor.
> + * @resolution: Extended attribute representing the resolution of the sensor.
> + * Set to 0 if not reported by this sensor.
> + * @exponent: Extended attribute representing the power-of-10 multiplier that is
> + * applied to the resolution field.
> + * Reported here only for scalar sensors.
> + * Set to 0 if not reported by this sensor.
> + * @scalar_attrs: Extended attributes representing minimum and maximum
> + * measurable values by this sensor.
> + * Reported here only for scalar sensors.
> + * Set to 0 if not reported by this sensor.
> + */
> struct scmi_sensor_info {
> - u32 id;
> - u8 type;
> - s8 scale;
> - u8 num_trip_points;
> + unsigned int id;
> + unsigned int type;
> + int scale;
> + unsigned int num_trip_points;
> bool async;
> + bool update;
> + bool timestamped;
> + int tstamp_scale;
> + unsigned int num_axis;
> + struct scmi_sensor_axis_info *axis;
> + struct scmi_sensor_intervals_info intervals;
> char name[SCMI_MAX_STR_SIZE];
> + bool extended_scalar_attrs;
> + unsigned int sensor_power;
> + unsigned int resolution;
> + int exponent;
> + struct scmi_range_attrs scalar_attrs;
> };
On Tue, Nov 10, 2020 at 05:00:05PM +0100, Mailing Lists wrote:
> On 26.10.20 21:10, Cristian Marussi wrote:
> > Add support for new SCMIv3.0 Sensors extensions related to new sensors'
> > features, like multiple axis and update intervals, while keeping
> > compatibility with SCMIv2.0 features.
> > While at that, refactor and simplify all the internal helpers macros and
> > move struct scmi_sensor_info to use only non-fixed-size typing.
> >
> > Signed-off-by: Cristian Marussi <[email protected]>
> > ---
> > v1 --> v2
> > - restrict segmented intervals descriptors to single triplet
> > - add proper usage of scmi_reset_rx_to_maxsz
> > ---
> > drivers/firmware/arm_scmi/sensors.c | 391 ++++++++++++++++++++++++++--
> > include/linux/scmi_protocol.h | 219 +++++++++++++++-
> > 2 files changed, 584 insertions(+), 26 deletions(-)
> >
> > diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
> > index 6aaff478d032..5a18f8c84bef 100644
> > --- a/drivers/firmware/arm_scmi/sensors.c
> > +++ b/drivers/firmware/arm_scmi/sensors.c
> > @@ -7,16 +7,21 @@
> >
> > #define pr_fmt(fmt) "SCMI Notifications SENSOR - " fmt
> >
> > +#include <linux/bitfield.h>
> > #include <linux/scmi_protocol.h>
> >
> > #include "common.h"
> > #include "notify.h"
> >
> > +#define SCMI_MAX_NUM_SENSOR_AXIS 64
>
> IMHO the related 6 bit wide fields, like SENSOR_DESCRIPTION_GET "Number
> of axes", should determine the maximum value, so 64 -> 63.
>
Yes, bits [21:16] 'Number of Axes' in sensor_attributes_high, but this
#define was meant to represent the maximum number of sensor axis (64...ranging
from 0 to 63) not the highest possible numbered (63).
> [...]
>
> > +
> > +/**
> > + * struct scmi_sensor_info - represents information related to one of the
> > + * available sensors.
> > + * @id: Sensor ID.
> > + * @type: Sensor type. Chosen amongst one of @enum scmi_sensor_class.
> > + * @scale: Power-of-10 multiplier applied to the sensor unit.
> > + * @num_trip_points: Number of maximum configurable trip points.
> > + * @async: Flag for asynchronous read support.
> > + * @update: Flag for continuouos update notification support.
> > + * @timestamped: Flag for timestamped read support.
> > + * @tstamp_scale: Power-of-10 multiplier applied to the sensor timestamps to
> > + * represent it in seconds.
> > + * @num_axis: Number of supported axis if any. Reported as 0 for scalar sensors.
> > + * @axis: Pointer to an array of @num_axis descriptors.
> > + * @intervals: Descriptor of available update intervals.
> > + * @sensor_config: A bitmask reporting the current sensor configuration as
> > + * detailed in the SCMI specification: it can accessed and
> > + * modified through the accompanying macros.
> > + * @name: NULL-terminated string representing sensor name as advertised by
> > + * SCMI platform.
> > + * @extended_scalar_attrs: Flag to indicate the presence of additional extended
> > + * attributes for this sensor.
> > + * @sensor_power: Extended attribute representing the average power
> > + * consumed by the sensor in microwatts (uW) when it is active.
> > + * Reported here only for scalar sensors.
>
> Above line should go to @resolution below.
>
Ah, right.
Regards
Cristian
> Best regards,
>
> Peter
>
> > + * Set to 0 if not reported by this sensor.
> > + * @resolution: Extended attribute representing the resolution of the sensor.
> > + * Set to 0 if not reported by this sensor.
> > + * @exponent: Extended attribute representing the power-of-10 multiplier that is
> > + * applied to the resolution field.
> > + * Reported here only for scalar sensors.
> > + * Set to 0 if not reported by this sensor.
> > + * @scalar_attrs: Extended attributes representing minimum and maximum
> > + * measurable values by this sensor.
> > + * Reported here only for scalar sensors.
> > + * Set to 0 if not reported by this sensor.
> > + */
> > struct scmi_sensor_info {
> > - u32 id;
> > - u8 type;
> > - s8 scale;
> > - u8 num_trip_points;
> > + unsigned int id;
> > + unsigned int type;
> > + int scale;
> > + unsigned int num_trip_points;
> > bool async;
> > + bool update;
> > + bool timestamped;
> > + int tstamp_scale;
> > + unsigned int num_axis;
> > + struct scmi_sensor_axis_info *axis;
> > + struct scmi_sensor_intervals_info intervals;
> > char name[SCMI_MAX_STR_SIZE];
> > + bool extended_scalar_attrs;
> > + unsigned int sensor_power;
> > + unsigned int resolution;
> > + int exponent;
> > + struct scmi_range_attrs scalar_attrs;
> > };
Hi Cristian,
sorry, I mistakenly used the wrong sender ("Mailing Lists") for the
original comment mail. Please see below for my reply.
On 10.11.20 18:21, Cristian Marussi wrote:
> On Tue, Nov 10, 2020 at 05:00:05PM +0100, Mailing Lists wrote:
>> On 26.10.20 21:10, Cristian Marussi wrote:
>>> Add support for new SCMIv3.0 Sensors extensions related to new sensors'
>>> features, like multiple axis and update intervals, while keeping
>>> compatibility with SCMIv2.0 features.
>>> While at that, refactor and simplify all the internal helpers macros and
>>> move struct scmi_sensor_info to use only non-fixed-size typing.
>>>
>>> Signed-off-by: Cristian Marussi <[email protected]>
>>> ---
>>> v1 --> v2
>>> - restrict segmented intervals descriptors to single triplet
>>> - add proper usage of scmi_reset_rx_to_maxsz
>>> ---
>>> drivers/firmware/arm_scmi/sensors.c | 391 ++++++++++++++++++++++++++--
>>> include/linux/scmi_protocol.h | 219 +++++++++++++++-
>>> 2 files changed, 584 insertions(+), 26 deletions(-)
>>>
>>> diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
>>> index 6aaff478d032..5a18f8c84bef 100644
>>> --- a/drivers/firmware/arm_scmi/sensors.c
>>> +++ b/drivers/firmware/arm_scmi/sensors.c
>>> @@ -7,16 +7,21 @@
>>>
>>> #define pr_fmt(fmt) "SCMI Notifications SENSOR - " fmt
>>>
>>> +#include <linux/bitfield.h>
>>> #include <linux/scmi_protocol.h>
>>>
>>> #include "common.h"
>>> #include "notify.h"
>>>
>>> +#define SCMI_MAX_NUM_SENSOR_AXIS 64
>>
>> IMHO the related 6 bit wide fields, like SENSOR_DESCRIPTION_GET "Number
>> of axes", should determine the maximum value, so 64 -> 63.
>>
>
> Yes, bits [21:16] 'Number of Axes' in sensor_attributes_high, but this
> #define was meant to represent the maximum number of sensor axis (64...ranging
> from 0 to 63) not the highest possible numbered (63).
>
But in my understanding the actual maximum number of sensor axes is 63
due to the maximum value 63 of 'Number of Axes', 64 would overflow
already. The ids would range from 0 to 62.
That said, in my understanding there is no problem with retaining a
higher value ATM.
Best regards,
Peter
On Tue, Nov 10, 2020 at 06:50:04PM +0100, Peter Hilber wrote:
> Hi Cristian,
>
> sorry, I mistakenly used the wrong sender ("Mailing Lists") for the
> original comment mail. Please see below for my reply.
>
> On 10.11.20 18:21, Cristian Marussi wrote:
> > On Tue, Nov 10, 2020 at 05:00:05PM +0100, Mailing Lists wrote:
> >> On 26.10.20 21:10, Cristian Marussi wrote:
> >>> Add support for new SCMIv3.0 Sensors extensions related to new sensors'
> >>> features, like multiple axis and update intervals, while keeping
> >>> compatibility with SCMIv2.0 features.
> >>> While at that, refactor and simplify all the internal helpers macros and
> >>> move struct scmi_sensor_info to use only non-fixed-size typing.
> >>>
> >>> Signed-off-by: Cristian Marussi <[email protected]>
> >>> ---
> >>> v1 --> v2
> >>> - restrict segmented intervals descriptors to single triplet
> >>> - add proper usage of scmi_reset_rx_to_maxsz
> >>> ---
> >>> drivers/firmware/arm_scmi/sensors.c | 391 ++++++++++++++++++++++++++--
> >>> include/linux/scmi_protocol.h | 219 +++++++++++++++-
> >>> 2 files changed, 584 insertions(+), 26 deletions(-)
> >>>
> >>> diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
> >>> index 6aaff478d032..5a18f8c84bef 100644
> >>> --- a/drivers/firmware/arm_scmi/sensors.c
> >>> +++ b/drivers/firmware/arm_scmi/sensors.c
> >>> @@ -7,16 +7,21 @@
> >>>
> >>> #define pr_fmt(fmt) "SCMI Notifications SENSOR - " fmt
> >>>
> >>> +#include <linux/bitfield.h>
> >>> #include <linux/scmi_protocol.h>
> >>>
> >>> #include "common.h"
> >>> #include "notify.h"
> >>>
> >>> +#define SCMI_MAX_NUM_SENSOR_AXIS 64
> >>
> >> IMHO the related 6 bit wide fields, like SENSOR_DESCRIPTION_GET "Number
> >> of axes", should determine the maximum value, so 64 -> 63.
> >>
> >
> > Yes, bits [21:16] 'Number of Axes' in sensor_attributes_high, but this
> > #define was meant to represent the maximum number of sensor axis (64...ranging
> > from 0 to 63) not the highest possible numbered (63).
> >
>
> But in my understanding the actual maximum number of sensor axes is 63
> due to the maximum value 63 of 'Number of Axes', 64 would overflow
> already. The ids would range from 0 to 62.
Ah damn, you're right ... maximum that I can set in 5 bits is anyway 63.
I'll fix.
Thanks
Cristian
>
> That said, in my understanding there is no problem with retaining a
> higher value ATM.
>
> Best regards,
>
> Peter