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x86/resctrl: Add "mba_MBps_event" file to CTRL_MON directories

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The "mba_MBps" mount option provides an alternate method to control memory
bandwidth. Instead of specifying allowable bandwidth as a percentage of
maximum possible, the user provides a MiB/s limit value.

In preparation to allow the user to pick the memory bandwidth monitoring event
used as input to the feedback loop, provide a file in each CTRL_MON group
directory that shows the event currently in use. Note that this file is only
visible when the "mba_MBps" mount option is in use.

Suggested-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>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20241206163148.83828-7-tony.luck@intel.com
This commit is contained in:
Tony Luck
2024-12-06 08:31:46 -08:00
committed by Borislav Petkov (AMD)
parent 141cb5c482
commit f5cd0e316f
3 changed files with 42 additions and 0 deletions
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30
arch/x86/kernel/cpu/resctrl/ctrlmondata.c
View File

@@ -518,6 +518,36 @@ static int smp_mon_event_count(void *arg)
return 0;
}
int rdtgroup_mba_mbps_event_show(struct kernfs_open_file *of,
struct seq_file *s, void *v)
{
struct rdtgroup *rdtgrp;
int ret = 0;
rdtgrp = rdtgroup_kn_lock_live(of->kn);
if (rdtgrp) {
switch (rdtgrp->mba_mbps_event) {
case QOS_L3_MBM_LOCAL_EVENT_ID:
seq_puts(s, "mbm_local_bytes\n");
break;
case QOS_L3_MBM_TOTAL_EVENT_ID:
seq_puts(s, "mbm_total_bytes\n");
break;
default:
pr_warn_once("Bad event %d\n", rdtgrp->mba_mbps_event);
ret = -EINVAL;
break;
}
} else {
ret = -ENOENT;
}
rdtgroup_kn_unlock(of->kn);
return ret;
}
void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
cpumask_t *cpumask, int evtid, int first)

2
arch/x86/kernel/cpu/resctrl/internal.h
View File

@@ -610,6 +610,8 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off);
int rdtgroup_schemata_show(struct kernfs_open_file *of,
struct seq_file *s, void *v);
int rdtgroup_mba_mbps_event_show(struct kernfs_open_file *of,
struct seq_file *s, void *v);
bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_ctrl_domain *d,
unsigned long cbm, int closid, bool exclusive);
unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_ctrl_domain *d,

10
arch/x86/kernel/cpu/resctrl/rdtgroup.c
View File

@@ -1950,6 +1950,12 @@ static struct rftype res_common_files[] = {
.seq_show = rdtgroup_schemata_show,
.fflags = RFTYPE_CTRL_BASE,
},
{
.name = "mba_MBps_event",
.mode = 0444,
.kf_ops = &rdtgroup_kf_single_ops,
.seq_show = rdtgroup_mba_mbps_event_show,
},
{
.name = "mode",
.mode = 0644,
@@ -2355,6 +2361,7 @@ static int set_mba_sc(bool mba_sc)
struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
u32 num_closid = resctrl_arch_get_num_closid(r);
struct rdt_ctrl_domain *d;
unsigned long fflags;
int i;
if (!supports_mba_mbps() || mba_sc == is_mba_sc(r))
@@ -2369,6 +2376,9 @@ static int set_mba_sc(bool mba_sc)
d->mbps_val[i] = MBA_MAX_MBPS;
}
fflags = mba_sc ? RFTYPE_CTRL_BASE | RFTYPE_MON_BASE : 0;
resctrl_file_fflags_init("mba_MBps_event", fflags);
return 0;
}