0001 What: /sys/devices/uncore_iio_x/dieX
0002 Date: February 2020
0003 Contact: Roman Sudarikov <roman.sudarikov@linux.intel.com>
0004 Description:
0005 Each IIO stack (PCIe root port) has its own IIO PMON block, so
0006 each dieX file (where X is die number) holds "Segment:Root Bus"
0007 for PCIe root port, which can be monitored by that IIO PMON
0008 block.
0009 For example, on 4-die Xeon platform with up to 6 IIO stacks per
0010 die and, therefore, 6 IIO PMON blocks per die, the mapping of
0011 IIO PMON block 0 exposes as the following::
0012
0013 $ ls /sys/devices/uncore_iio_0/die*
0014 -r--r--r-- /sys/devices/uncore_iio_0/die0
0015 -r--r--r-- /sys/devices/uncore_iio_0/die1
0016 -r--r--r-- /sys/devices/uncore_iio_0/die2
0017 -r--r--r-- /sys/devices/uncore_iio_0/die3
0018
0019 $ tail /sys/devices/uncore_iio_0/die*
0020 ==> /sys/devices/uncore_iio_0/die0 <==
0021 0000:00
0022 ==> /sys/devices/uncore_iio_0/die1 <==
0023 0000:40
0024 ==> /sys/devices/uncore_iio_0/die2 <==
0025 0000:80
0026 ==> /sys/devices/uncore_iio_0/die3 <==
0027 0000:c0
0028
0029 Which means::
0030
0031 IIO PMU 0 on die 0 belongs to PCI RP on bus 0x00, domain 0x0000
0032 IIO PMU 0 on die 1 belongs to PCI RP on bus 0x40, domain 0x0000
0033 IIO PMU 0 on die 2 belongs to PCI RP on bus 0x80, domain 0x0000
0034 IIO PMU 0 on die 3 belongs to PCI RP on bus 0xc0, domain 0x0000
