61fb0f7e97
Add description for /sys/devices/uncore_upi_*/die* attributes to sysfs-devices-mapping. Signed-off-by: Alexander Antonov <alexander.antonov@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Kan Liang <kan.liang@linux.intel.com> Link: https://lore.kernel.org/r/20221117122833.3103580-11-alexander.antonov@linux.intel.com
2.5 KiB
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