From: Babu Moger Babu.Moger@amd.com
commit 064855a69003c24bd6b473b367d364e418c57625 upstream.
Creating a new sub monitoring group in the root /sys/fs/resctrl leads to getting the "Unavailable" value for mbm_total_bytes and mbm_local_bytes on the entire filesystem.
Steps to reproduce:
1. mount -t resctrl resctrl /sys/fs/resctrl/
2. cd /sys/fs/resctrl/
3. cat mon_data/mon_L3_00/mbm_total_bytes 23189832
4. Create sub monitor group: mkdir mon_groups/test1
5. cat mon_data/mon_L3_00/mbm_total_bytes Unavailable
When a new monitoring group is created, a new RMID is assigned to the new group. But the RMID is not active yet. When the events are read on the new RMID, it is expected to report the status as "Unavailable".
When the user reads the events on the default monitoring group with multiple subgroups, the events on all subgroups are consolidated together. Currently, if any of the RMID reads report as "Unavailable", then everything will be reported as "Unavailable".
Fix the issue by discarding the "Unavailable" reads and reporting all the successful RMID reads. This is not a problem on Intel systems as Intel reports 0 on Inactive RMIDs.
Fixes: d89b7379015f ("x86/intel_rdt/cqm: Add mon_data") Reported-by: Paweł Szulik pawel.szulik@intel.com Signed-off-by: Babu Moger Babu.Moger@amd.com Signed-off-by: Borislav Petkov bp@suse.de Acked-by: Reinette Chatre reinette.chatre@intel.com Cc: stable@vger.kernel.org Link: https://bugzilla.kernel.org/show_bug.cgi?id=213311 Link: https://lkml.kernel.org/r/162793309296.9224.15871659871696482080.stgit@bmoge... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kernel/cpu/resctrl/monitor.c | 27 +++++++++++++-------------- 1 file changed, 13 insertions(+), 14 deletions(-)
--- a/arch/x86/kernel/cpu/resctrl/monitor.c +++ b/arch/x86/kernel/cpu/resctrl/monitor.c @@ -223,15 +223,14 @@ static u64 mbm_overflow_count(u64 prev_m return chunks >>= shift; }
-static int __mon_event_count(u32 rmid, struct rmid_read *rr) +static u64 __mon_event_count(u32 rmid, struct rmid_read *rr) { struct mbm_state *m; u64 chunks, tval;
tval = __rmid_read(rmid, rr->evtid); if (tval & (RMID_VAL_ERROR | RMID_VAL_UNAVAIL)) { - rr->val = tval; - return -EINVAL; + return tval; } switch (rr->evtid) { case QOS_L3_OCCUP_EVENT_ID: @@ -243,12 +242,6 @@ static int __mon_event_count(u32 rmid, s case QOS_L3_MBM_LOCAL_EVENT_ID: m = &rr->d->mbm_local[rmid]; break; - default: - /* - * Code would never reach here because - * an invalid event id would fail the __rmid_read. - */ - return -EINVAL; }
if (rr->first) { @@ -298,23 +291,29 @@ void mon_event_count(void *info) struct rdtgroup *rdtgrp, *entry; struct rmid_read *rr = info; struct list_head *head; + u64 ret_val;
rdtgrp = rr->rgrp;
- if (__mon_event_count(rdtgrp->mon.rmid, rr)) - return; + ret_val = __mon_event_count(rdtgrp->mon.rmid, rr);
/* - * For Ctrl groups read data from child monitor groups. + * For Ctrl groups read data from child monitor groups and + * add them together. Count events which are read successfully. + * Discard the rmid_read's reporting errors. */ head = &rdtgrp->mon.crdtgrp_list;
if (rdtgrp->type == RDTCTRL_GROUP) { list_for_each_entry(entry, head, mon.crdtgrp_list) { - if (__mon_event_count(entry->mon.rmid, rr)) - return; + if (__mon_event_count(entry->mon.rmid, rr) == 0) + ret_val = 0; } } + + /* Report error if none of rmid_reads are successful */ + if (ret_val) + rr->val = ret_val; }
/*