Documentation/ABI/testing/sysfs-devices-mapping

   1 What:           /sys/devices/uncore_iio_x/dieX
   2 Date:           February 2020
   3 Contact:        Roman Sudarikov <roman.sudarikov@linux.intel.com>
   4 Description:
   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
  31                     IIO PMU 0 on die 0 belongs to PCI RP on bus 0x00, domain 0x0000
  32                     IIO PMU 0 on die 1 belongs to PCI RP on bus 0x40, domain 0x0000
  33                     IIO PMU 0 on die 2 belongs to PCI RP on bus 0x80, domain 0x0000
  34                     IIO PMU 0 on die 3 belongs to PCI RP on bus 0xc0, domain 0x0000