Re: [PATCH v3 2/6] firmware: arm_scmi: add SCMIv3.0 Sensors descriptors extensions

Cristian Marussi
2020-11-19T12:21:11Z

Hi Sudeep

thanks for the review.

On Thu, Nov 19, 2020 at 11:39:00AM +0000, Sudeep Holla wrote:
> On Wed, Nov 18, 2020 at 04:29:01PM +0000, 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.
> >
>
> Sorry for late review.
>
> > Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
> > ---
> > v2 --> v3
> > - Fix SCMI_MAX_NUM_SENSOR_AXIS
> > - added missing Dox comment in resolution
> > - added common INTVL SEGMENT macros
> >
> > 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 | 223 +++++++++++++++-
> > 2 files changed, 588 insertions(+), 26 deletions(-)
> >
> > diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
> > index 6aaff478d032..1c83aaae0012 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 63
> > +
> > 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 {
>
> [nit] Does "_le" above indicate little endian ? If so, please drop it here
> and elsewhere in the series as it is not consistent with other structure
> names. LE is assumed throughout SCMI.
>
Yes, the idea really was to have a different naming for this internal
structure which is mapped out to an scmi_range_attrs exposed in scmi_protocol.h
with low/high values merged into u64 for the externally visible fields...
...so I can rename as wished....it was just a way to represent here that it is
a msg structure. I'll rename it.

> > + __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))
>
> Why can't we just hardcode the offset ? This needs changes when we modify
> the structure in future for additional elements right ?
>

Ok, I'll do I thought was more self explaining to see how it is
calculated but I can add a comment.

> > +
> > +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);
>
> Just thinking if we can avoid this my having union comprising of v1 and v2
> structures ?
>

Not sure to understand, axis_descr are only v3.0 and in fact this is
called only for v > 2 I think, BUT the problem is that both this and the
main sensor descriptor v3 msg payloads are runtime variable, so that it
is stated in the msg->extended_attrs itself if that particular sensor desc
response that I'm parsing has the additional extended fields or not:
so the dance with dsize to keep track of where the current response ends
and when the next starts...but maybe I've not got really what you meant.

> > + }
> > +
> > + 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
>
> The version comment might be confusing and the check for si->version.
> We need to clarify until SCMIv3.0, sensor protocol version = v1.0 and
> it is v2.0 from SCMI v3.0 onwards.

Ok I'll introduce some define if it's fine for you.

>
> > + * 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);
>
> Can we drop the logging or make it _dbg ? Make flood in a system with 100s of
> sensors.
>

Sure, I was wondering in fact what to do with this: because the command
is optional but it seemed odd to me that an SCMIv3.0 sensor does not
expose any update interval so I wanted to log somehow this anomaly.
(but maybe it's just not an anomaly)

> > + }
> > + /**
> > + * 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..53cc5ce0e494 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 +149,238 @@ 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;
> > +#define SCMI_SENS_INTVL_SEGMENT_LOW 0
> > +#define SCMI_SENS_INTVL_SEGMENT_HIGH 1
> > +#define SCMI_SENS_INTVL_SEGMENT_STEP 2
> > + 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.
> > + * Reported here only for scalar sensors.
> > + * 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;
> > };
> >
>
> Below changes can go in a separate patch as it is just update of entires
> as per latest SCMIv2.0 spec and not entirely related to v3.0.
>

Sure.

Thanks

Cristian

> > /*
> > * 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)
> > */
>
> --
> Regards,
> Sudeep