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X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jun 2025 23:39:55.3207 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: /lQa5uuG8U538cWr3CGj79IdsonsGSP2ynUGn+fzMatE75O3yz/cu/sbYdEhBr1N2Db4NhB3aI+7R2SOqNRI5n3Y5zH/H4ms8rRXbYjpezE= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR11MB7676 X-OriginatorOrg: intel.com Hi Babu, On 6/13/25 2:04 PM, Babu Moger wrote: > Provide the interface to display the number of counters IDs available for "Introduce the "available_mbm_cntrs" resctrl file to display the number of counters available ..." > assignment in each domain when "mbm_event" mode is enabled. > > Signed-off-by: Babu Moger > --- ... > --- > Documentation/filesystems/resctrl.rst | 11 ++++++ > fs/resctrl/monitor.c | 5 ++- > fs/resctrl/rdtgroup.c | 48 +++++++++++++++++++++++++++ > 3 files changed, 63 insertions(+), 1 deletion(-) > > diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst > index 801914de0c81..8a2050098091 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=32;1=32 > > +"available_mbm_cntrs": > + The number of assignable counters available in each domain when "The number of counters available for assignment in each domain ..." > + mbm_event 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=30;1=30 > + > "max_threshold_occupancy": > Read/write file provides the largest value (in > bytes) at which a previously used LLC_occupancy > diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c > index 92a87aa97b0f..2893da994f3c 100644 > --- a/fs/resctrl/monitor.c > +++ b/fs/resctrl/monitor.c > @@ -924,9 +924,12 @@ int resctrl_mon_resource_init(void) > else if (resctrl_is_mon_event_enabled(QOS_L3_MBM_TOTAL_EVENT_ID)) > mba_mbps_default_event = QOS_L3_MBM_TOTAL_EVENT_ID; > > - if (r->mon.mbm_cntr_assignable) > + if (r->mon.mbm_cntr_assignable) { > 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); > + } > > return 0; > } > diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c > index 90b52593ef29..08bcca9bd8b6 100644 > --- a/fs/resctrl/rdtgroup.c > +++ b/fs/resctrl/rdtgroup.c > @@ -1853,6 +1853,48 @@ static int resctrl_num_mbm_cntrs_show(struct kernfs_open_file *of, > return 0; > } > > +static int resctrl_available_mbm_cntrs_show(struct kernfs_open_file *of, > + struct seq_file *s, void *v) > +{ > + struct rdt_resource *r = rdt_kn_parent_priv(of->kn); > + struct rdt_mon_domain *dom; > + bool sep = false; > + u32 cntrs, i; > + int ret = 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_cntr_assign mode is not enabled\n"); > + ret = -EINVAL; > + goto unlock_cntrs_show; unlock_cntrs_show -> out_unlock (to be consistent with rest of resctrl) Reinette