tree 5eabb064115a6462757ffe5e1e2cd14f23ceee2e
parent 23ef59b7b545f70976e9901b2b1a1962d73b8484
author Jaghathiswari Rankappagounder Natarajan <jaghu@google.com> 1543529799 -0800
committer Jaghathiswari Rankappagounder Natarajan <jaghu@google.com> 1543529887 -0800

google-ipmi-sys: Add support for PCIE slot to I2C bus mapping

Say the bmc has the following information:
root@xyz:/sys/bus/i2c/devices# ls
0-0070   10-0048  4-0049   5-0062   5-0066   5-0074   i2c-1    i2c-15   i2c-18   i2c-20   i2c-4    i2c-7
1-004e   3-0054   4-004d   5-0063   5-0067   9-004c   i2c-10   i2c-16   i2c-19   i2c-21   i2c-5    i2c-8
1-004f   4-0048   5-0061   5-0065   5-0072   i2c-0    i2c-14   i2c-17   i2c-2    i2c-3    i2c-6    i2c-9
root@xyz:/sys/bus/i2c/devices# cd i2c-18
root@xyz:/sys/bus/i2c/devices/i2c-18# ls
delete_device  i2c-dev        mux_device     name           new_device
of_node        power          subsystem      uevent
root@xyz:/sys/bus/i2c/devices/i2c-18# cd of_node
root@xyz:/sys/bus/i2c/devices/i2c-18/of_node# ls
root@xyz:/sys/bus/i2c/devices/i2c-18/of_node# cat pcie-slot
/pcie-slot/pcie@4root@xyz:/sys/bus/i2c/devices/i2c-18/of_node# cd
root@xyz:~# cd /sys/firmware/devicetree/base
root@xyz:/sys/firmware/devicetree/base# ls
root@xyz:/sys/firmware/devicetree/base# cd pcie-slot/
root@xyz:/sys/firmware/devicetree/base/pcie-slot# ls
name     pcie@1a  pcie@2a  pcie@4  pcie@6
root@xyz:/sys/firmware/devicetree/base/pcie-slot# cd pcie\@4
root@xyz:/sys/firmware/devicetree/base/pcie-slot/pcie@4# ls
name       slot-name
root@xyz:/sys/firmware/devicetree/base/pcie-slot/pcie@4# cat slot-name
slot4root@xyz:/sys/firmware/devicetree/base/pcie-slot/pcie@4#

Then the system can send commands to
1) Get the number of pcie slots.
2) Get information about which i2c bus is routed to which pcie slot.

Tested:
Yes;
1) Sending GetPCIeSlotsCount command; Getting pcie slots count as 4.
root@xyz:~# ipmitool -I dbus raw 0x2e 0x32 0x79 0x2b 0x00 0x04
 79 2b 00 04 04

3) Sending GetPCIeSlotI2cBusMapping command with entry ID 0; expecting success;
received "slot5".
root@xyz:~# ipmitool -I dbus raw 0x2e 0x32 0x79 0x2b 0x00 0x05 0x00
 79 2b 00 05 14 05 73 6c 6f 74 35

4) Sending GetPCIeSlotI2cBusMapping command with entry ID 1; expecting success;
received "slot1".
root@xyz:~# ipmitool -I dbus raw 0x2e 0x32 0x79 0x2b 0x00 0x05 0x01
 79 2b 00 05 0e 05 73 6c 6f 74 31

5) Sending GetPCIeSlotI2cBusMapping command with entry ID 2; expecting success;
received "slot3".
root@xyz:~# ipmitool -I dbus raw 0x2e 0x32 0x79 0x2b 0x00 0x05 0x02
 79 2b 00 05 12 05 73 6c 6f 74 33

6) Sending GetPCIeSlotI2cBusMapping command with entry ID 3; expecting success;
received "slot2".
root@xyz:~# ipmitool -I dbus raw 0x2e 0x32 0x79 0x2b 0x00 0x05 0x03
 79 2b 00 05 10 05 73 6c 6f 74 32

7) Sending GetPCIeSlotI2cBusMapping command with entry ID 4; expecting failure
root@xyz:~# ipmitool -I dbus raw 0x2e 0x32 0x79 0x2b 0x00 0x05 0x04
Unable to send RAW command (channel=0x0 netfn=0x2e lun=0x0 cmd=0x32 rsp=0xc1): Invalid command
root@xyz:~#

Change-Id: Id6e514bb11e8d4a00c615cffea6c2fdb6f5df03e
Signed-off-by: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>