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x86/resctrl: Add sparse_masks file in info

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Add the interface in resctrl FS to show if sparse cache allocation
bit masks are supported on the platform. Reading the file returns
either a "1" if non-contiguous 1s are supported and "0" otherwise.
The file path is /sys/fs/resctrl/info/{resource}/sparse_masks, where
{resource} can be either "L2" or "L3".

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Peter Newman <peternewman@google.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Peter Newman <peternewman@google.com>
Link: https://lore.kernel.org/r/7300535160beba41fd8aa073749ec1ee29b4621f.1696934091.git.maciej.wieczor-retman@intel.com
This commit is contained in:
Fenghua Yu 2023-10-10 12:42:38 +02:00 committed by Borislav Petkov (AMD)
parent 0e3cd31f6e
commit 4dba8f10b8
1 changed files with 18 additions and 0 deletions
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18
arch/x86/kernel/cpu/resctrl/rdtgroup.c
View file

@ -1117,6 +1117,17 @@ static enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type)
}
}
static int rdt_has_sparse_bitmasks_show(struct kernfs_open_file *of,
struct seq_file *seq, void *v)
{
struct resctrl_schema *s = of->kn->parent->priv;
struct rdt_resource *r = s->res;
seq_printf(seq, "%u\n", r->cache.arch_has_sparse_bitmasks);
return 0;
}
/**
* __rdtgroup_cbm_overlaps - Does CBM for intended closid overlap with other
* @r: Resource to which domain instance @d belongs.
@ -1839,6 +1850,13 @@ static struct rftype res_common_files[] = {
.seq_show = rdtgroup_size_show,
.fflags = RF_CTRL_BASE,
},
{
.name = "sparse_masks",
.mode = 0444,
.kf_ops = &rdtgroup_kf_single_ops,
.seq_show = rdt_has_sparse_bitmasks_show,
.fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE,
},
};