x86/resctrl: Fill out rmid_read structure for smp_call*() to read a counter

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mon_event_read() fills out most fields of the struct rmid_read that is passed
via an smp_call*() function to a CPU that is part of the correct domain to
read the monitor counters.

With Sub-NUMA Cluster (SNC) mode there are now two cases to handle:

1) Reading a file that returns a value for a single domain.
   + Choose the CPU to execute from the domain cpu_mask

2) Reading a file that must sum across domains sharing an L3 cache
   instance.
   + Indicate to called code that a sum is needed by passing a NULL
     rdt_mon_domain pointer.
   + Choose the CPU from the L3 shared_cpu_map.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-16-tony.luck@intel.com

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This commit is contained in:

Tony Luck 2024-06-28 14:56:15 -07:00 • committed by Borislav Petkov (AMD)

parent 6b48b80b08

commit c8c7d3d904

3 changed files with 34 additions and 10 deletions

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arch/x86/kernel/cpu/resctrl/ctrlmondata.c

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arch/x86/kernel/cpu/resctrl/internal.h

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2

arch/x86/kernel/cpu/resctrl/rdtgroup.c

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