bb42b3d397
Current version supports a server line starting Intel® Xeon® Processor
Scalable Family and introduces mapping for IIO Uncore units only.
Other units can be added on demand.
IIO stack to PMON mapping is exposed through:
/sys/devices/uncore_iio_<pmu_idx>/dieX
where dieX is file which holds "Segment:Root Bus" for PCIe root port,
which can be monitored by that IIO PMON block.
Details are explained in Documentation/ABI/testing/sysfs-devices-mapping
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Alexander Antonov <alexander.antonov@linux.intel.com>
Signed-off-by: Roman Sudarikov <roman.sudarikov@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Reviewed-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Link: https://lkml.kernel.org/r/20200601083543.30011-4-alexander.antonov@linux.intel.com
34 lines
1.6 KiB
Plaintext
34 lines
1.6 KiB
Plaintext
What: /sys/devices/uncore_iio_x/dieX
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Date: February 2020
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Contact: Roman Sudarikov <roman.sudarikov@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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