1bb42b3d3SRoman SudarikovWhat:           /sys/devices/uncore_iio_x/dieX
2bb42b3d3SRoman SudarikovDate:           February 2020
3bb42b3d3SRoman SudarikovContact:        Roman Sudarikov <roman.sudarikov@linux.intel.com>
4bb42b3d3SRoman SudarikovDescription:
5bb42b3d3SRoman Sudarikov                Each IIO stack (PCIe root port) has its own IIO PMON block, so
6bb42b3d3SRoman Sudarikov                each dieX file (where X is die number) holds "Segment:Root Bus"
7bb42b3d3SRoman Sudarikov                for PCIe root port, which can be monitored by that IIO PMON
8bb42b3d3SRoman Sudarikov                block.
9bb42b3d3SRoman Sudarikov                For example, on 4-die Xeon platform with up to 6 IIO stacks per
10bb42b3d3SRoman Sudarikov                die and, therefore, 6 IIO PMON blocks per die, the mapping of
11bb42b3d3SRoman Sudarikov                IIO PMON block 0 exposes as the following:
12bb42b3d3SRoman Sudarikov
13bb42b3d3SRoman Sudarikov                $ ls /sys/devices/uncore_iio_0/die*
14bb42b3d3SRoman Sudarikov                -r--r--r-- /sys/devices/uncore_iio_0/die0
15bb42b3d3SRoman Sudarikov                -r--r--r-- /sys/devices/uncore_iio_0/die1
16bb42b3d3SRoman Sudarikov                -r--r--r-- /sys/devices/uncore_iio_0/die2
17bb42b3d3SRoman Sudarikov                -r--r--r-- /sys/devices/uncore_iio_0/die3
18bb42b3d3SRoman Sudarikov
19bb42b3d3SRoman Sudarikov                $ tail /sys/devices/uncore_iio_0/die*
20bb42b3d3SRoman Sudarikov                ==> /sys/devices/uncore_iio_0/die0 <==
21bb42b3d3SRoman Sudarikov                0000:00
22bb42b3d3SRoman Sudarikov                ==> /sys/devices/uncore_iio_0/die1 <==
23bb42b3d3SRoman Sudarikov                0000:40
24bb42b3d3SRoman Sudarikov                ==> /sys/devices/uncore_iio_0/die2 <==
25bb42b3d3SRoman Sudarikov                0000:80
26bb42b3d3SRoman Sudarikov                ==> /sys/devices/uncore_iio_0/die3 <==
27bb42b3d3SRoman Sudarikov                0000:c0
28bb42b3d3SRoman Sudarikov
29bb42b3d3SRoman Sudarikov                Which means:
30bb42b3d3SRoman Sudarikov                IIO PMU 0 on die 0 belongs to PCI RP on bus 0x00, domain 0x0000
31bb42b3d3SRoman Sudarikov                IIO PMU 0 on die 1 belongs to PCI RP on bus 0x40, domain 0x0000
32bb42b3d3SRoman Sudarikov                IIO PMU 0 on die 2 belongs to PCI RP on bus 0x80, domain 0x0000
33bb42b3d3SRoman Sudarikov                IIO PMU 0 on die 3 belongs to PCI RP on bus 0xc0, domain 0x0000
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