diff options
| author | Fenghua Yu <fenghua.yu@intel.com> | 2023-10-10 12:42:38 +0200 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-10-11 21:51:24 +0200 |
| commit | 4dba8f10b8fef9c5b0f9ed83dd1af91a1795ead1 (patch) | |
| tree | 8114736a1b7a16a6b051c61fbe9871be2f5f6e6f /arch/x86/kernel/cpu/resctrl/rdtgroup.c | |
| parent | 0e3cd31f6e9074886dea5a999bfcc563d144e7de (diff) | |
x86/resctrl: Add sparse_masks file in info
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
Diffstat (limited to 'arch/x86/kernel/cpu/resctrl/rdtgroup.c')
| -rw-r--r-- | arch/x86/kernel/cpu/resctrl/rdtgroup.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c index a52cdf97c21c..09848ff11f7b 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -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, + }, }; |