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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Apr 2025 00:20:26.6600 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ee272ecb-1487-4cb2-ef36-08dd730e7fd6 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: MWH0EPF000971E3.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8993 Content-Type: text/plain; charset="utf-8" Provide the interface to display the number of monitoring counters available for assignment in each domain when mbm_cntr_assign mode is enabled. Signed-off-by: Babu Moger --- 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/arch/x86/resctrl.rst | 11 ++++++ arch/x86/kernel/cpu/resctrl/monitor.c | 4 ++- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 48 ++++++++++++++++++++++++++ 3 files changed, 62 insertions(+), 1 deletion(-) diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/re= sctrl.rst index 35d908befdfb..44128fbda4fe 100644 --- a/Documentation/arch/x86/resctrl.rst +++ b/Documentation/arch/x86/resctrl.rst @@ -295,6 +295,17 @@ 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 monitoring counters available for assignment in each + domain when mbm_cntr_assign mode is enabled on the system. + + For example, on a system with 30 available [hardware] monitoring 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/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/re= sctrl/monitor.c index 028b49878ad0..8a88ac29d57d 100644 --- a/arch/x86/kernel/cpu/resctrl/monitor.c +++ b/arch/x86/kernel/cpu/resctrl/monitor.c @@ -1234,8 +1234,10 @@ int __init resctrl_mon_resource_init(void) else if (resctrl_arch_is_mbm_total_enabled()) mba_mbps_default_event =3D QOS_L3_MBM_TOTAL_EVENT_ID; =20 - if (r->mon.mbm_cntr_assignable) + if (r->mon.mbm_cntr_assignable) { resctrl_file_fflags_init("num_mbm_cntrs", RFTYPE_MON_INFO); + resctrl_file_fflags_init("available_mbm_cntrs", RFTYPE_MON_INFO); + } =20 return 0; } diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r= esctrl/rdtgroup.c index cb7a8a2de3ff..07792b45bd63 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -936,6 +936,48 @@ static int resctrl_num_mbm_cntrs_show(struct kernfs_op= en_file *of, return 0; } =20 +static int resctrl_available_mbm_cntrs_show(struct kernfs_open_file *of, + struct seq_file *s, void *v) +{ + struct rdt_resource *r =3D of->kn->parent->priv; + 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_cntr_assign mode is not enabled\n"); + ret =3D -EINVAL; + goto unlock_cntrs_show; + } + + 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_puts(s, "\n"); + +unlock_cntrs_show: + mutex_unlock(&rdtgroup_mutex); + cpus_read_unlock(); + + return ret; +} + #ifdef CONFIG_PROC_CPU_RESCTRL =20 /* @@ -1975,6 +2017,12 @@ static struct rftype res_common_files[] =3D { .kf_ops =3D &rdtgroup_kf_single_ops, .seq_show =3D resctrl_num_mbm_cntrs_show, }, + { + .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 "cpus", .mode =3D 0644, --=20 2.34.1