1 What: /sys/devices/uncore_iio_x/dieX 1 What: /sys/devices/uncore_iio_x/dieX
2 Date: February 2020 2 Date: February 2020
3 Contact: Alexander Antonov <alexander.an 3 Contact: Alexander Antonov <alexander.antonov@linux.intel.com>
4 Description: 4 Description:
5 Each IIO stack (PCIe root port 5 Each IIO stack (PCIe root port) has its own IIO PMON block, so
6 each dieX file (where X is die 6 each dieX file (where X is die number) holds "Segment:Root Bus"
7 for PCIe root port, which can 7 for PCIe root port, which can be monitored by that IIO PMON
8 block. 8 block.
9 For example, on 4-die Xeon pla 9 For example, on 4-die Xeon platform with up to 6 IIO stacks per
10 die and, therefore, 6 IIO PMON 10 die and, therefore, 6 IIO PMON blocks per die, the mapping of
11 IIO PMON block 0 exposes as th 11 IIO PMON block 0 exposes as the following::
12 12
13 $ ls /sys/devices/uncore_i 13 $ ls /sys/devices/uncore_iio_0/die*
14 -r--r--r-- /sys/devices/un 14 -r--r--r-- /sys/devices/uncore_iio_0/die0
15 -r--r--r-- /sys/devices/un 15 -r--r--r-- /sys/devices/uncore_iio_0/die1
16 -r--r--r-- /sys/devices/un 16 -r--r--r-- /sys/devices/uncore_iio_0/die2
17 -r--r--r-- /sys/devices/un 17 -r--r--r-- /sys/devices/uncore_iio_0/die3
18 18
19 $ tail /sys/devices/uncore 19 $ tail /sys/devices/uncore_iio_0/die*
20 ==> /sys/devices/uncore_ii 20 ==> /sys/devices/uncore_iio_0/die0 <==
21 0000:00 21 0000:00
22 ==> /sys/devices/uncore_ii 22 ==> /sys/devices/uncore_iio_0/die1 <==
23 0000:40 23 0000:40
24 ==> /sys/devices/uncore_ii 24 ==> /sys/devices/uncore_iio_0/die2 <==
25 0000:80 25 0000:80
26 ==> /sys/devices/uncore_ii 26 ==> /sys/devices/uncore_iio_0/die3 <==
27 0000:c0 27 0000:c0
28 28
29 Which means:: 29 Which means::
30 30
31 IIO PMU 0 on die 0 belongs 31 IIO PMU 0 on die 0 belongs to PCI RP on bus 0x00, domain 0x0000
32 IIO PMU 0 on die 1 belongs 32 IIO PMU 0 on die 1 belongs to PCI RP on bus 0x40, domain 0x0000
33 IIO PMU 0 on die 2 belongs 33 IIO PMU 0 on die 2 belongs to PCI RP on bus 0x80, domain 0x0000
34 IIO PMU 0 on die 3 belongs 34 IIO PMU 0 on die 3 belongs to PCI RP on bus 0xc0, domain 0x0000
35 35
36 What: /sys/devices/uncore_upi_x/dieX 36 What: /sys/devices/uncore_upi_x/dieX
37 Date: March 2022 37 Date: March 2022
38 Contact: Alexander Antonov <alexander.an 38 Contact: Alexander Antonov <alexander.antonov@linux.intel.com>
39 Description: 39 Description:
40 Each /sys/devices/uncore_upi_X 40 Each /sys/devices/uncore_upi_X/dieY file holds "upi_Z,die_W"
41 value that means UPI link numb 41 value that means UPI link number X on die Y is connected to UPI
42 link Z on die W and this link 42 link Z on die W and this link between sockets can be monitored
43 by UPI PMON block. 43 by UPI PMON block.
44 For example, 4-die Sapphire Ra 44 For example, 4-die Sapphire Rapids platform has the following
45 UPI 0 topology:: 45 UPI 0 topology::
46 46
47 # tail /sys/devices/uncore 47 # tail /sys/devices/uncore_upi_0/die*
48 ==> /sys/devices/uncore_up 48 ==> /sys/devices/uncore_upi_0/die0 <==
49 upi_1,die_1 49 upi_1,die_1
50 ==> /sys/devices/uncore_up 50 ==> /sys/devices/uncore_upi_0/die1 <==
51 upi_0,die_3 51 upi_0,die_3
52 ==> /sys/devices/uncore_up 52 ==> /sys/devices/uncore_upi_0/die2 <==
53 upi_1,die_3 53 upi_1,die_3
54 ==> /sys/devices/uncore_up 54 ==> /sys/devices/uncore_upi_0/die3 <==
55 upi_0,die_1 55 upi_0,die_1
56 56
57 Which means:: 57 Which means::
58 58
59 UPI link 0 on die 0 is con 59 UPI link 0 on die 0 is connected to UPI link 1 on die 1
60 UPI link 0 on die 1 is con 60 UPI link 0 on die 1 is connected to UPI link 0 on die 3
61 UPI link 0 on die 2 is con 61 UPI link 0 on die 2 is connected to UPI link 1 on die 3
62 UPI link 0 on die 3 is con 62 UPI link 0 on die 3 is connected to UPI link 0 on die 1
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