Messages in this thread Patch in this message | | | From | Maciej Wieczor-Retman <> | Subject | [PATCH v3 3/4] x86/resctrl: Add sparse_masks file in info | Date | Fri, 29 Sep 2023 11:02:17 +0200 |
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From: Fenghua Yu <fenghua.yu@intel.com>
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> Reviewed-by: Peter Newman <peternewman@google.com> Tested-by: Peter Newman <peternewman@google.com> Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com> --- Changelog v3: - Add Peter's tested-by and reviewed-by tags. - Reword patch message slightly. (Reinette)
Changelog v2: - Change bitmap naming convention to bit mask. (Reinette) - Change file name to "sparse_masks". (Reinette)
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c index 725344048f85..945801898a4d 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -895,6 +895,17 @@ static int rdt_shareable_bits_show(struct kernfs_open_file *of, return 0; } +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; +} + /** * rdt_bit_usage_show - Display current usage of resources * @@ -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, + }, }; -- 2.42.0
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