tree 88b1574483ddfcacd235efc24b68a818af4d5247
parent ead7e927675d28e0e1b7bbc5d47e9bbcdda4da2e
author Jayashree Dhanapal <jayashree-d@hcl.com> 1647854152 +0530
committer Zhikui Ren <zhikui.ren@intel.com> 1673214236 +0000

Added support for IPMB based SDR detection dynamically

SDR is a data record that provides platform management sensor type,
locations, event generation and access information.

A data records that contain information about the type and the
number of sensors in the platform, sensor threshold support,
event generation capabilities and information on what type
of readings the sensor provides.

Here, SDR of Type 1 records are implemented based on IPMB to read
the sensor information from each bus which can be configured
using IPMB FRU from the EM file.

Sample Config :
{
       "Bus": "$ipmbindex",
       "Class": "IpmbDevice",
       "Name": "$ipmbindex + 1 Twinlake Board",
       "PowerState": "Always",
       "Type": "IpmbDevice"
}

This configuration is based on the "xyz.openbmc_project.Ipmb.FruDevice"
service, which will read FRU information from each IPMB bus. "$bus"
will give the bus index for each IPMB bus.

If IPMB FRU is detected, SDR info and record count of the sensor in
each bus will be identified. After getting the record count,
Reservation ID for each IPMB bus will be received.

IpmbSDRDevice will retrieve the full set of SDR Records starting with
0000h as the Record ID to get the first record. The Next Record ID is
extracted from the response and this is then used as the Record ID in
a Get SDR request to get the next record. This is repeated until the
record count value is matched.

The full information of each sensor such as sensor name, sensor type,
sensor unit, threshold values, sensor unique number will be received
using IPMB.

Once all the sensor information is read, each data will be processed
and stored in the structure. These data will be accessed in the
below gerrit patch.

https://gerrit.openbmc-project.xyz/c/openbmc/dbus-sensors/+/52164

Tested : Tested on YosemiteV2 platform and verified all the IPMB based
         SDR Type 1 supported device data.

Signed-off-by: Jayashree Dhanapal <jayashree-d@hcl.com>
Change-Id: I5f808b68c3052ec5bf78d3d5c5495bd1f448ade3