| What: /sys/devices/uncore_iio_x/dieX |
| Date: February 2020 |
| Contact: Alexander Antonov <alexander.antonov@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 |
| |
| What: /sys/devices/uncore_upi_x/dieX |
| Date: March 2022 |
| Contact: Alexander Antonov <alexander.antonov@linux.intel.com> |
| Description: |
| Each /sys/devices/uncore_upi_X/dieY file holds "upi_Z,die_W" |
| value that means UPI link number X on die Y is connected to UPI |
| link Z on die W and this link between sockets can be monitored |
| by UPI PMON block. |
| For example, 4-die Sapphire Rapids platform has the following |
| UPI 0 topology:: |
| |
| # tail /sys/devices/uncore_upi_0/die* |
| ==> /sys/devices/uncore_upi_0/die0 <== |
| upi_1,die_1 |
| ==> /sys/devices/uncore_upi_0/die1 <== |
| upi_0,die_3 |
| ==> /sys/devices/uncore_upi_0/die2 <== |
| upi_1,die_3 |
| ==> /sys/devices/uncore_upi_0/die3 <== |
| upi_0,die_1 |
| |
| Which means:: |
| |
| UPI link 0 on die 0 is connected to UPI link 1 on die 1 |
| UPI link 0 on die 1 is connected to UPI link 0 on die 3 |
| UPI link 0 on die 2 is connected to UPI link 1 on die 3 |
| UPI link 0 on die 3 is connected to UPI link 0 on die 1 |
