62 lines
2.5 KiB
Plaintext
62 lines
2.5 KiB
Plaintext
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What: /sys/devices/uncore_iio_x/dieX
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Date: February 2020
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Contact: Alexander Antonov <alexander.antonov@linux.intel.com>
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Description:
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Each IIO stack (PCIe root port) has its own IIO PMON block, so
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each dieX file (where X is die number) holds "Segment:Root Bus"
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for PCIe root port, which can be monitored by that IIO PMON
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block.
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For example, on 4-die Xeon platform with up to 6 IIO stacks per
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die and, therefore, 6 IIO PMON blocks per die, the mapping of
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IIO PMON block 0 exposes as the following::
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$ ls /sys/devices/uncore_iio_0/die*
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-r--r--r-- /sys/devices/uncore_iio_0/die0
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-r--r--r-- /sys/devices/uncore_iio_0/die1
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-r--r--r-- /sys/devices/uncore_iio_0/die2
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-r--r--r-- /sys/devices/uncore_iio_0/die3
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$ tail /sys/devices/uncore_iio_0/die*
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==> /sys/devices/uncore_iio_0/die0 <==
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0000:00
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==> /sys/devices/uncore_iio_0/die1 <==
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0000:40
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==> /sys/devices/uncore_iio_0/die2 <==
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0000:80
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==> /sys/devices/uncore_iio_0/die3 <==
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0000:c0
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Which means::
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IIO PMU 0 on die 0 belongs to PCI RP on bus 0x00, domain 0x0000
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IIO PMU 0 on die 1 belongs to PCI RP on bus 0x40, domain 0x0000
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IIO PMU 0 on die 2 belongs to PCI RP on bus 0x80, domain 0x0000
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IIO PMU 0 on die 3 belongs to PCI RP on bus 0xc0, domain 0x0000
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What: /sys/devices/uncore_upi_x/dieX
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Date: March 2022
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Contact: Alexander Antonov <alexander.antonov@linux.intel.com>
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Description:
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Each /sys/devices/uncore_upi_X/dieY file holds "upi_Z,die_W"
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value that means UPI link number X on die Y is connected to UPI
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link Z on die W and this link between sockets can be monitored
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by UPI PMON block.
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For example, 4-die Sapphire Rapids platform has the following
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UPI 0 topology::
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# tail /sys/devices/uncore_upi_0/die*
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==> /sys/devices/uncore_upi_0/die0 <==
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upi_1,die_1
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==> /sys/devices/uncore_upi_0/die1 <==
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upi_0,die_3
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==> /sys/devices/uncore_upi_0/die2 <==
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upi_1,die_3
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==> /sys/devices/uncore_upi_0/die3 <==
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upi_0,die_1
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Which means::
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UPI link 0 on die 0 is connected to UPI link 1 on die 1
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UPI link 0 on die 1 is connected to UPI link 0 on die 3
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UPI link 0 on die 2 is connected to UPI link 1 on die 3
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UPI link 0 on die 3 is connected to UPI link 0 on die 1
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