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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Sep 2025 21:36:56.9025 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e30fe3af-5691-481e-e932-08ddecc456c2 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF0000343D.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB6756 Content-Type: text/plain; charset="utf-8" Introduce the "available_mbm_cntrs" resctrl file to display the number of counters available for assignment in each domain when "mbm_event" mode is enabled. Signed-off-by: Babu Moger Reviewed-by: Reinette Chatre --- v18: Added Reviewed-by tag. v17: Moved resctrl_available_mbm_cntrs_show() to fs/resctrl/monitor.c. Removed the Reviewed-by tag. v16: Added Reviewed-by tag. v15: Minor changelog text update. Minor resctrl.rst text update and corrected the error text in resctrl_available_mbm_cntrs_show(). Changed the goto label to out_unlock for consistency. v14: Minor changelog update. Changed subject line to fs/resctrl. v13: Resolved conflicts caused by the recent FS/ARCH code restructure. The files monitor.c and rdtgroup.c file has now been split between the FS and ARCH directories. v12: Minor change to change log. Updated the documentation text with an example. Replaced seq_puts(s, ";") with seq_putc(s, ';'); Added missing rdt_last_cmd_clear() in resctrl_available_mbm_cntrs_show= (). v11: Rename rdtgroup_available_mbm_cntrs_show() to resctrl_available_mbm_cn= trs_show(). Few minor text changes. v10: Patch changed to handle the counters at domain level. https://lore.kernel.org/lkml/CALPaoCj+zWq1vkHVbXYP0znJbe6Ke3PXPWjtri5A= FgD9cQDCUg@mail.gmail.com/ So, display logic also changed now. v9: New patch --- Documentation/filesystems/resctrl.rst | 11 +++++++ fs/resctrl/internal.h | 3 ++ fs/resctrl/monitor.c | 44 +++++++++++++++++++++++++++ fs/resctrl/rdtgroup.c | 6 ++++ 4 files changed, 64 insertions(+) diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesyst= ems/resctrl.rst index 4eb27530be6f..446736dbd97f 100644 --- a/Documentation/filesystems/resctrl.rst +++ b/Documentation/filesystems/resctrl.rst @@ -299,6 +299,17 @@ with the following files: # cat /sys/fs/resctrl/info/L3_MON/num_mbm_cntrs 0=3D32;1=3D32 =20 +"available_mbm_cntrs": + The number of counters available for assignment in each domain when mbm_e= vent + mode is enabled on the system. + + For example, on a system with 30 available [hardware] assignable counters + in each of its L3 domains: + :: + + # cat /sys/fs/resctrl/info/L3_MON/available_mbm_cntrs + 0=3D30;1=3D30 + "max_threshold_occupancy": Read/write file provides the largest value (in bytes) at which a previously used LLC_occupancy diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h index e4d7aa1a8fd1..35a8bad8ca75 100644 --- a/fs/resctrl/internal.h +++ b/fs/resctrl/internal.h @@ -388,6 +388,9 @@ int resctrl_mbm_assign_mode_show(struct kernfs_open_fil= e *of, struct seq_file *s =20 int resctrl_num_mbm_cntrs_show(struct kernfs_open_file *of, struct seq_fil= e *s, void *v); =20 +int resctrl_available_mbm_cntrs_show(struct kernfs_open_file *of, struct s= eq_file *s, + void *v); + #ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp); =20 diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c index 667770ecfd78..4185f2a4ba89 100644 --- a/fs/resctrl/monitor.c +++ b/fs/resctrl/monitor.c @@ -938,6 +938,48 @@ int resctrl_num_mbm_cntrs_show(struct kernfs_open_file= *of, return 0; } =20 +int resctrl_available_mbm_cntrs_show(struct kernfs_open_file *of, + struct seq_file *s, void *v) +{ + struct rdt_resource *r =3D rdt_kn_parent_priv(of->kn); + struct rdt_mon_domain *dom; + bool sep =3D false; + u32 cntrs, i; + int ret =3D 0; + + cpus_read_lock(); + mutex_lock(&rdtgroup_mutex); + + rdt_last_cmd_clear(); + + if (!resctrl_arch_mbm_cntr_assign_enabled(r)) { + rdt_last_cmd_puts("mbm_event counter assignment mode is not enabled\n"); + ret =3D -EINVAL; + goto out_unlock; + } + + list_for_each_entry(dom, &r->mon_domains, hdr.list) { + if (sep) + seq_putc(s, ';'); + + cntrs =3D 0; + for (i =3D 0; i < r->mon.num_mbm_cntrs; i++) { + if (!dom->cntr_cfg[i].rdtgrp) + cntrs++; + } + + seq_printf(s, "%d=3D%u", dom->hdr.id, cntrs); + sep =3D true; + } + seq_putc(s, '\n'); + +out_unlock: + mutex_unlock(&rdtgroup_mutex); + cpus_read_unlock(); + + return ret; +} + /** * resctrl_mon_resource_init() - Initialise global monitoring structures. * @@ -985,6 +1027,8 @@ int resctrl_mon_resource_init(void) resctrl_enable_mon_event(QOS_L3_MBM_LOCAL_EVENT_ID); resctrl_file_fflags_init("num_mbm_cntrs", RFTYPE_MON_INFO | RFTYPE_RES_CACHE); + resctrl_file_fflags_init("available_mbm_cntrs", + RFTYPE_MON_INFO | RFTYPE_RES_CACHE); } =20 return 0; diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c index 61f7b68f2273..2e1d0a2703da 100644 --- a/fs/resctrl/rdtgroup.c +++ b/fs/resctrl/rdtgroup.c @@ -1822,6 +1822,12 @@ static struct rftype res_common_files[] =3D { .seq_show =3D rdt_mon_features_show, .fflags =3D RFTYPE_MON_INFO, }, + { + .name =3D "available_mbm_cntrs", + .mode =3D 0444, + .kf_ops =3D &rdtgroup_kf_single_ops, + .seq_show =3D resctrl_available_mbm_cntrs_show, + }, { .name =3D "num_rmids", .mode =3D 0444, --=20 2.34.1