Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

[linux-2.6-microblaze.git] / arch / x86 / kernel / cpu / resctrl / monitor.c

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index f07c10b..57e4bb6 100644 (file)
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -285,15 +285,14 @@ static u64 mbm_overflow_count(u64 prev_msr, u64 cur_msr, unsigned int width)
        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:
@@ -305,12 +304,6 @@ static int __mon_event_count(u32 rmid, struct rmid_read *rr)
        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) {
@@ -361,23 +354,29 @@ 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;
 }
 
 /*