diff options
| author | Babu Moger <babu.moger@amd.com> | 2025-09-05 16:34:12 -0500 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-09-15 12:16:11 +0200 |
| commit | 16ff6b038fb3b64aa033efdc95d673239610e1a6 (patch) | |
| tree | 416d33ca9479ebbd2d7fb947ce64a203cd989bb7 /fs/resctrl/monitor.c | |
| parent | 4d32c24a74f2c12ff440d381ba01de574f6631ce (diff) | |
fs/resctrl: Introduce interface to display number of free MBM counters
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 <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com
Diffstat (limited to 'fs/resctrl/monitor.c')
| -rw-r--r-- | fs/resctrl/monitor.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c index 112979e9c444..1fa82a62b2e5 100644 --- a/fs/resctrl/monitor.c +++ b/fs/resctrl/monitor.c @@ -936,6 +936,48 @@ int resctrl_num_mbm_cntrs_show(struct kernfs_open_file *of, return 0; } +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_event counter assignment mode is not enabled\n"); + ret = -EINVAL; + goto out_unlock; + } + + list_for_each_entry(dom, &r->mon_domains, hdr.list) { + if (sep) + seq_putc(s, ';'); + + cntrs = 0; + for (i = 0; i < r->mon.num_mbm_cntrs; i++) { + if (!dom->cntr_cfg[i].rdtgrp) + cntrs++; + } + + seq_printf(s, "%d=%u", dom->hdr.id, cntrs); + sep = true; + } + seq_putc(s, '\n'); + +out_unlock: + mutex_unlock(&rdtgroup_mutex); + cpus_read_unlock(); + + return ret; +} + /** * resctrl_mon_resource_init() - Initialise global monitoring structures. * @@ -983,6 +1025,8 @@ 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); } return 0; |