[PATCH v6 12/30] fs/resctrl: Make event details accessible to functions when reading events

[Tony Luck <tony.luck@intel.com>]

All details about a monitor event are kept in the mon_evt structure.
Upper levels of code only provide the event id to lower levels.
This will become a problem when new attributes are added to the
mon_evt structure.

Change the mon_data and rmid_read structures to hold a pointer
to the mon_evt structure instead of just taking a copy of the
event id.

No functional change.

Signed-off-by: Tony Luck <tony.luck@intel.com>
---
 fs/resctrl/internal.h    |  8 ++++----
 fs/resctrl/ctrlmondata.c | 16 ++++++++--------
 fs/resctrl/monitor.c     | 17 +++++++++--------
 fs/resctrl/rdtgroup.c    |  6 +++---
 4 files changed, 24 insertions(+), 23 deletions(-)

diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index b12242d20e61..1458fda64423 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -90,7 +90,7 @@ extern struct mon_evt mon_event_all[QOS_NUM_EVENTS];
 struct mon_data {
 	struct list_head	list;
 	enum resctrl_res_level	rid;
-	enum resctrl_event_id	evtid;
+	struct mon_evt		*evt;
 	int			domid;
 	bool			sum;
 };
@@ -103,7 +103,7 @@ struct mon_data {
  * @r:	   Resource describing the properties of the event being read.
  * @hdr:   Header of domain that the counter should be read from. If NULL then sum all
  *	   domains in @r sharing L3 @ci.id
- * @evtid: Which monitor event to read.
+ * @evt:   Event associated with the event file.
  * @first: Initialize MBM counter when true.
  * @ci_id: Cacheinfo id for L3. Only set when @hdr is NULL. Used when summing domains.
  * @err:   Error encountered when reading counter.
@@ -117,7 +117,7 @@ struct rmid_read {
 	struct rdtgroup		*rgrp;
 	struct rdt_resource	*r;
 	struct rdt_domain_hdr	*hdr;
-	enum resctrl_event_id	evtid;
+	struct mon_evt		*evt;
 	bool			first;
 	unsigned int		ci_id;
 	int			err;
@@ -353,7 +353,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg);
 
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 		    struct rdt_domain_hdr *hdr, struct rdtgroup *rdtgrp,
-		    cpumask_t *cpumask, int evtid, int first);
+		    cpumask_t *cpumask, struct mon_evt *evt, int first);
 
 int resctrl_mon_resource_init(void);
 
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index 1d7086509bfa..a99903ac5d27 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -548,7 +548,7 @@ struct rdt_domain_hdr *resctrl_find_domain(struct list_head *h, int id,
 
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 		    struct rdt_domain_hdr *hdr, struct rdtgroup *rdtgrp,
-		    cpumask_t *cpumask, int evtid, int first)
+		    cpumask_t *cpumask, struct mon_evt *evt, int first)
 {
 	int cpu;
 
@@ -559,11 +559,11 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 	 * Setup the parameters to pass to mon_event_count() to read the data.
 	 */
 	rr->rgrp = rdtgrp;
-	rr->evtid = evtid;
+	rr->evt = evt;
 	rr->r = r;
 	rr->hdr = hdr;
 	rr->first = first;
-	rr->arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, evtid);
+	rr->arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, evt->evtid);
 	if (IS_ERR(rr->arch_mon_ctx)) {
 		rr->err = -EINVAL;
 		return;
@@ -582,20 +582,20 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 	else
 		smp_call_on_cpu(cpu, smp_mon_event_count, rr, false);
 
-	resctrl_arch_mon_ctx_free(r, evtid, rr->arch_mon_ctx);
+	resctrl_arch_mon_ctx_free(r, evt->evtid, rr->arch_mon_ctx);
 }
 
 int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 {
 	struct kernfs_open_file *of = m->private;
 	enum resctrl_res_level resid;
-	enum resctrl_event_id evtid;
 	struct rdt_domain_hdr *hdr;
 	struct rmid_read rr = {0};
 	struct rdtgroup *rdtgrp;
 	int domid, cpu, ret = 0;
 	struct rdt_resource *r;
 	struct cacheinfo *ci;
+	struct mon_evt *evt;
 	struct mon_data *md;
 
 	rdtgrp = rdtgroup_kn_lock_live(of->kn);
@@ -612,7 +612,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 
 	resid = md->rid;
 	domid = md->domid;
-	evtid = md->evtid;
+	evt = md->evt;
 	r = resctrl_arch_get_resource(resid);
 
 	if (md->sum) {
@@ -636,7 +636,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 				if (!ci)
 					continue;
 				mon_event_read(&rr, r, NULL, rdtgrp,
-					       &ci->shared_cpu_map, evtid, false);
+					       &ci->shared_cpu_map, evt, false);
 				goto checkresult;
 			}
 		}
@@ -652,7 +652,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 			ret = -ENOENT;
 			goto out;
 		}
-		mon_event_read(&rr, r, hdr, rdtgrp, &hdr->cpu_mask, evtid, false);
+		mon_event_read(&rr, r, hdr, rdtgrp, &hdr->cpu_mask, evt, false);
 	}
 
 checkresult:
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index 28d96147b9f4..6d4191eff391 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -370,8 +370,8 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 							 RDT_RESOURCE_L3)))
 			return -EINVAL;
 		d = container_of(rr->hdr, struct rdt_l3_mon_domain, hdr);
-		resctrl_arch_reset_rmid(rr->r, d, closid, rmid, rr->evtid);
-		m = get_mbm_state(d, closid, rmid, rr->evtid);
+		resctrl_arch_reset_rmid(rr->r, d, closid, rmid, rr->evt->evtid);
+		m = get_mbm_state(d, closid, rmid, rr->evt->evtid);
 		if (m)
 			memset(m, 0, sizeof(struct mbm_state));
 		return 0;
@@ -382,7 +382,7 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 		if (!cpumask_test_cpu(cpu, &rr->hdr->cpu_mask))
 			return -EINVAL;
 		rr->err = resctrl_arch_rmid_read(rr->r, rr->hdr, closid, rmid,
-						 rr->evtid, &tval, rr->arch_mon_ctx);
+						 rr->evt->evtid, &tval, rr->arch_mon_ctx);
 		if (rr->err)
 			return rr->err;
 
@@ -411,7 +411,7 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 		if (d->ci_id != rr->ci_id)
 			continue;
 		err = resctrl_arch_rmid_read(rr->r, &d->hdr, closid, rmid,
-					     rr->evtid, &tval, rr->arch_mon_ctx);
+					     rr->evt->evtid, &tval, rr->arch_mon_ctx);
 		if (!err) {
 			rr->val += tval;
 			ret = 0;
@@ -445,7 +445,7 @@ static void mbm_bw_count(u32 closid, u32 rmid, struct rmid_read *rr)
 	if (WARN_ON_ONCE(domain_header_is_valid(rr->hdr, RESCTRL_MON_DOMAIN, RDT_RESOURCE_L3)))
 		return;
 	d = container_of(rr->hdr, struct rdt_l3_mon_domain, hdr);
-	m = get_mbm_state(d, closid, rmid, rr->evtid);
+	m = get_mbm_state(d, closid, rmid, rr->evt->evtid);
 	if (WARN_ON_ONCE(!m))
 		return;
 
@@ -616,12 +616,13 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_l3_mon_domain *dom_m
 static void mbm_update_one_event(struct rdt_resource *r, struct rdt_l3_mon_domain *d,
 				 u32 closid, u32 rmid, enum resctrl_event_id evtid)
 {
+	struct mon_evt *evt = &mon_event_all[evtid];
 	struct rmid_read rr = {0};
 
 	rr.r = r;
 	rr.hdr = &d->hdr;
-	rr.evtid = evtid;
-	rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
+	rr.evt = evt;
+	rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, evt->evtid);
 	if (IS_ERR(rr.arch_mon_ctx)) {
 		pr_warn_ratelimited("Failed to allocate monitor context: %ld",
 				    PTR_ERR(rr.arch_mon_ctx));
@@ -637,7 +638,7 @@ static void mbm_update_one_event(struct rdt_resource *r, struct rdt_l3_mon_domai
 	if (is_mba_sc(NULL))
 		mbm_bw_count(closid, rmid, &rr);
 
-	resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
+	resctrl_arch_mon_ctx_free(rr.r, evt->evtid, rr.arch_mon_ctx);
 }
 
 static void mbm_update(struct rdt_resource *r, struct rdt_l3_mon_domain *d,
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 39018f6c8b14..a10f2f6825fc 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -2903,7 +2903,7 @@ static struct mon_data *mon_get_kn_priv(enum resctrl_res_level rid, int domid,
 
 	list_for_each_entry(priv, &mon_data_kn_priv_list, list) {
 		if (priv->rid == rid && priv->domid == domid &&
-		    priv->sum == do_sum && priv->evtid == mevt->evtid)
+		    priv->sum == do_sum && priv->evt == mevt)
 			return priv;
 	}
 
@@ -2914,7 +2914,7 @@ static struct mon_data *mon_get_kn_priv(enum resctrl_res_level rid, int domid,
 	priv->rid = rid;
 	priv->domid = domid;
 	priv->sum = do_sum;
-	priv->evtid = mevt->evtid;
+	priv->evt = mevt;
 	list_add_tail(&priv->list, &mon_data_kn_priv_list);
 
 	return priv;
@@ -3079,7 +3079,7 @@ static int mon_add_all_files(struct kernfs_node *kn, struct rdt_domain_hdr *hdr,
 			return ret;
 
 		if (r->rid == RDT_RESOURCE_L3 && !do_sum && resctrl_is_mbm_event(mevt->evtid))
-			mon_event_read(&rr, r, hdr, prgrp, &hdr->cpu_mask, mevt->evtid, true);
+			mon_event_read(&rr, r, hdr, prgrp, &hdr->cpu_mask, mevt, true);
 	}
 
 	return 0;
-- 
2.49.0