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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Apr 2025 00:22:18.4052 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6bc569c0-c864-4503-4832-08dd730ec274 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000971E9.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8245 Content-Type: text/plain; charset="utf-8" The interface displays the assignment states for each group when mbm_cntr_assign mode is enabled. The list is displayed in the following format: :=3D Event configuration: A valid event configuration listed in the /sys/fs/resctrl/info/L3_MON/counter_configs directory. Domain ID: A valid domain ID number. The assignment type can be one of the following: _ : No event configuration assigned e : Event configuration assigned in exclusive mode Example: $cd /sys/fs/resctrl $cat mbm_L3_assignments mbm_total_bytes:0=3De;1=3De mbm_local_bytes:0=3De;1=3De Signed-off-by: Babu Moger --- v12: New patch: Assignment interface moved inside the group based the discussion https://lore.kernel.org/lkml/CALPaoCiii0vXOF06mfV=3DkVLBzhfNo0SFqt4kQG= wGSGVUqvr2Dg@mail.gmail.com/#t --- Documentation/arch/x86/resctrl.rst | 27 +++++++++++++++ arch/x86/kernel/cpu/resctrl/monitor.c | 1 + arch/x86/kernel/cpu/resctrl/rdtgroup.c | 48 ++++++++++++++++++++++++++ 3 files changed, 76 insertions(+) diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/re= sctrl.rst index a67f09323da0..31085b4e15f6 100644 --- a/Documentation/arch/x86/resctrl.rst +++ b/Documentation/arch/x86/resctrl.rst @@ -503,6 +503,33 @@ When the "mba_MBps" mount option is used all CTRL_MON = groups will also contain: /sys/fs/resctrl/info/L3_MON/mon_features changes the input event. =20 +"mbm_L3_assignments": + The interface displays the assignment states for each group when + mbm_cntr_assign mode is enabled. + + The list is displayed in the following format: + + :=3D + + Event configuration: A valid event configuration listed in the + /sys/fs/resctrl/info/L3_MON/counter_configs directory. + + Domain ID: A valid domain ID number. + + Assignment types: + + _ : No event configuration assigned + + e : Event configuration assigned in exclusive mode + + Example: + :: + + # cd /sys/fs/resctrl + # cat mbm_L3_assignments + mbm_total_bytes:0=3De;1=3De + mbm_local_bytes:0=3De;1=3De + Resource allocation rules ------------------------- =20 diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/re= sctrl/monitor.c index 4e22563dda60..0c6fd5f6ec19 100644 --- a/arch/x86/kernel/cpu/resctrl/monitor.c +++ b/arch/x86/kernel/cpu/resctrl/monitor.c @@ -1266,6 +1266,7 @@ int __init resctrl_mon_resource_init(void) resctrl_file_fflags_init("available_mbm_cntrs", RFTYPE_MON_INFO); resctrl_file_fflags_init("event_filter", RFTYPE_MON_CONFIG); resctrl_file_fflags_init("mbm_assign_on_mkdir", RFTYPE_MON_INFO); + resctrl_file_fflags_init("mbm_L3_assignments", RFTYPE_MON_BASE); } =20 return 0; diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r= esctrl/rdtgroup.c index 3e440ace60e0..ee1c949c2436 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -2083,6 +2083,48 @@ static ssize_t event_filter_write(struct kernfs_open= _file *of, char *buf, return ret ?: nbytes; } =20 +static int mbm_L3_assignments_show(struct kernfs_open_file *of, struct seq= _file *s, void *v) +{ + struct rdt_resource *r =3D resctrl_arch_get_resource(RDT_RESOURCE_L3); + struct rdt_mon_domain *d; + struct rdtgroup *rdtgrp; + int i, ret =3D 0; + bool sep; + + rdtgrp =3D rdtgroup_kn_lock_live(of->kn); + if (!rdtgrp) + return -ENOENT; + + rdt_last_cmd_clear(); + if (!resctrl_arch_mbm_cntr_assign_enabled(r)) { + rdt_last_cmd_puts("mbm_cntr_assign mode not enabled\n"); + ret =3D -ENOENT; + goto assign_out; + } + + for (i =3D 0; i < NUM_MBM_ASSIGN_CONFIGS; i++) { + sep =3D false; + seq_printf(s, "%s:", mbm_assign_configs[i].name); + list_for_each_entry(d, &r->mon_domains, hdr.list) { + if (sep) + seq_puts(s, ";"); + + if (mbm_cntr_get(r, d, rdtgrp, mbm_assign_configs[i].evtid) >=3D 0) + seq_printf(s, "%d=3De", d->hdr.id); + else + seq_printf(s, "%d=3D_", d->hdr.id); + + sep =3D true; + } + seq_puts(s, "\n"); + } + +assign_out: + rdtgroup_kn_unlock(of->kn); + + return ret; +} + /* rdtgroup information files for one cache resource. */ static struct rftype res_common_files[] =3D { { @@ -2202,6 +2244,12 @@ static struct rftype res_common_files[] =3D { .seq_show =3D event_filter_show, .write =3D event_filter_write, }, + { + .name =3D "mbm_L3_assignments", + .mode =3D 0444, + .kf_ops =3D &rdtgroup_kf_single_ops, + .seq_show =3D mbm_L3_assignments_show, + }, { .name =3D "mbm_assign_mode", .mode =3D 0444, --=20 2.34.1