public-mirrors/linux
1
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-08-05 16:54:27 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

x86/resctrl: Display CLOSID for resource group

Browse source 
In x86, hardware uses CLOSID to identify a control group. When a user
creates a control group this information is not visible to the user. It
can help resctrl debugging.

Add CLOSID(ctrl_hw_id) to the control groups display in the resctrl
interface. Users can see this detail when resctrl is mounted with the
"-o debug" option.

Other architectures do not use "CLOSID". Use the names ctrl_hw_id to refer
to "CLOSID" in an effort to keep the naming generic.

For example:
  $cat /sys/fs/resctrl/ctrl_grp1/ctrl_hw_id
  1

Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Peter Newman <peternewman@google.com>
Reviewed-by: Tan Shaopeng <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Tan Shaopeng <tan.shaopeng@jp.fujitsu.com>
Link: https://lore.kernel.org/r/20231017002308.134480-8-babu.moger@amd.com
This commit is contained in:
Babu Moger 2023-10-16 19:23:06 -05:00 • committed by Borislav Petkov (AMD)
parent cb07d71f01
commit ca8dad225e
2 changed files with 27 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
Documentation/arch/x86/resctrl.rst
View file

@ -359,6 +359,10 @@ When control is enabled all CTRL_MON groups will also contain:
file. On successful pseudo-locked region creation the mode will
automatically change to "pseudo-locked".
"ctrl_hw_id":
Available only with debug option. The identifier used by hardware
for the control group. On x86 this is the CLOSID.
When monitoring is enabled all MON groups will also contain:
"mon_data":

23
arch/x86/kernel/cpu/resctrl/rdtgroup.c
View file

@ -779,6 +779,22 @@ static int rdtgroup_tasks_show(struct kernfs_open_file *of,
return ret;
}
static int rdtgroup_closid_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)
seq_printf(s, "%u\n", rdtgrp->closid);
else
ret = -ENOENT;
rdtgroup_kn_unlock(of->kn);
return ret;
}
#ifdef CONFIG_PROC_CPU_RESCTRL
/*
@ -1881,6 +1897,13 @@ static struct rftype res_common_files[] = {
.seq_show = rdt_has_sparse_bitmasks_show,
.fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
},
{
.name = "ctrl_hw_id",
.mode = 0444,
.kf_ops = &rdtgroup_kf_single_ops,
.seq_show = rdtgroup_closid_show,
.fflags = RFTYPE_CTRL_BASE | RFTYPE_DEBUG,
},
};