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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
