| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 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 |