1What:           /sys/devices/uncore_iio_x/dieX
 2Date:           February 2020
 3Contact:        Roman Sudarikov <roman.sudarikov@linux.intel.com>
 4Description:
 5                Each IIO stack (PCIe root port) has its own IIO PMON block, so
 6                each dieX file (where X is die number) holds "Segment:Root Bus"
 7                for PCIe root port, which can be monitored by that IIO PMON
 8                block.
 9                For example, on 4-die Xeon platform with up to 6 IIO stacks per
10                die and, therefore, 6 IIO PMON blocks per die, the mapping of
11                IIO PMON block 0 exposes as the following:
12
13                $ ls /sys/devices/uncore_iio_0/die*
14                -r--r--r-- /sys/devices/uncore_iio_0/die0
15                -r--r--r-- /sys/devices/uncore_iio_0/die1
16                -r--r--r-- /sys/devices/uncore_iio_0/die2
17                -r--r--r-- /sys/devices/uncore_iio_0/die3
18
19                $ tail /sys/devices/uncore_iio_0/die*
20                ==> /sys/devices/uncore_iio_0/die0 <==
21                0000:00
22                ==> /sys/devices/uncore_iio_0/die1 <==
23                0000:40
24                ==> /sys/devices/uncore_iio_0/die2 <==
25                0000:80
26                ==> /sys/devices/uncore_iio_0/die3 <==
27                0000:c0
28
29                Which means:
30                IIO PMU 0 on die 0 belongs to PCI RP on bus 0x00, domain 0x0000
31                IIO PMU 0 on die 1 belongs to PCI RP on bus 0x40, domain 0x0000
32                IIO PMU 0 on die 2 belongs to PCI RP on bus 0x80, domain 0x0000
33                IIO PMU 0 on die 3 belongs to PCI RP on bus 0xc0, domain 0x0000