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