The following commit has been merged into the perf/core branch of tip:
Commit-ID: 61fb0f7e974ac00ead611c00a57efdafac7785b5
Gitweb: https://git.kernel.org/tip/61fb0f7e974ac00ead611c00a57efdafac7785b5
Author: Alexander Antonov <alexander.antonov@xxxxxxxxxxxxxxx>
AuthorDate: Thu, 17 Nov 2022 12:28:32
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Thu, 24 Nov 2022 11:09:24 +01:00
perf/x86/intel/uncore: Update sysfs-devices-mapping file
Add description for /sys/devices/uncore_upi_*/die* attributes to
sysfs-devices-mapping.
Signed-off-by: Alexander Antonov <alexander.antonov@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221117122833.3103580-11-alexander.antonov@xxxxxxxxxxxxxxx
---
Documentation/ABI/testing/sysfs-devices-mapping | 30 +++++++++++++++-
1 file changed, 29 insertions(+), 1 deletion(-)
diff --git a/Documentation/ABI/testing/sysfs-devices-mapping b/Documentation/ABI/testing/sysfs-devices-mapping
index 8d202ba..2eee144 100644
--- a/Documentation/ABI/testing/sysfs-devices-mapping
+++ b/Documentation/ABI/testing/sysfs-devices-mapping
@@ -1,6 +1,6 @@
What: /sys/devices/uncore_iio_x/dieX
Date: February 2020
-Contact: Roman Sudarikov <roman.sudarikov@xxxxxxxxxxxxxxx>
+Contact: Alexander Antonov <alexander.antonov@xxxxxxxxxxxxxxx>
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"
@@ -32,3 +32,31 @@ Description:
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@xxxxxxxxxxxxxxx>
+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
\ No newline at end of file
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