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x86/resctrl: Add a new field to struct rmid_read for summation of domains

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When a user reads a monitor file rdtgroup_mondata_show() calls mon_event_read()
to package up all the required details into an rmid_read structure which is
passed across the smp_call*() infrastructure to code that will read data from
hardware and return the value (or error status) in the rmid_read structure.

Sub-NUMA Cluster (SNC) mode adds files with new semantics. These require the
smp_call-ed code to sum event data from all domains that share an L3 cache.

Add a pointer to the L3 "cacheinfo" structure to struct rmid_read for the data
collection routines to use to pick the domains to be summed.

  [ Reinette: the rmid_read structure has become complex enough so document each
    of its fields and provide the kerneldoc documentation for struct rmid_read. ]

Co-developed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-10-tony.luck@intel.com
This commit is contained in:
Tony Luck 2024-06-28 14:56:09 -07:00 committed by Borislav Petkov (AMD)
parent 328ea68874
commit fb1f51f677
1 changed files with 19 additions and 0 deletions
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19
arch/x86/kernel/cpu/resctrl/internal.h
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@ -144,12 +144,31 @@ union mon_data_bits {
} u;
};
/**
* struct rmid_read - Data passed across smp_call*() to read event count.
* @rgrp: Resource group for which the counter is being read. If it is a parent
* resource group then its event count is summed with the count from all
* its child resource groups.
* @r: Resource describing the properties of the event being read.
* @d: Domain that the counter should be read from. If NULL then sum all
* domains in @r sharing L3 @ci.id
* @evtid: Which monitor event to read.
* @first: Initialize MBM counter when true.
* @ci: Cacheinfo for L3. Only set when @d is NULL. Used when summing domains.
* @err: Error encountered when reading counter.
* @val: Returned value of event counter. If @rgrp is a parent resource group,
* @val includes the sum of event counts from its child resource groups.
* If @d is NULL, @val includes the sum of all domains in @r sharing @ci.id,
* (summed across child resource groups if @rgrp is a parent resource group).
* @arch_mon_ctx: Hardware monitor allocated for this read request (MPAM only).
*/
struct rmid_read {
struct rdtgroup *rgrp;
struct rdt_resource *r;
struct rdt_mon_domain *d;
enum resctrl_event_id evtid;
bool first;
struct cacheinfo *ci;
int err;
u64 val;
void *arch_mon_ctx;