linux-kernel - [PATCH v4 4/4] x86/resctrl: Replace open code cacheinfo searches

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Date: Sun,  9 Jun 2024 17:39:27 -0700
From: Tony Luck <tony.luck@...el.com>
To: Borislav Petkov <bp@...en8.de>
Cc: x86@...nel.org,
	Fenghua Yu <fenghua.yu@...el.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
	Peter Newman <peternewman@...gle.com>,
	James Morse <james.morse@....com>,
	Babu Moger <babu.moger@....com>,
	Drew Fustini <dfustini@...libre.com>,
	Dave Martin <Dave.Martin@....com>,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v4 4/4] x86/resctrl: Replace open code cacheinfo searches

pseudo_lock_region_init() and rdtgroup_cbm_to_size() open code
a search for details of a particular cache level.

Replace with get_cpu_cacheinfo_level()

Signed-off-by: Tony Luck <tony.luck@...el.com>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
---
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 17 ++++++-----------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 14 +++++---------
 2 files changed, 11 insertions(+), 20 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index aacf236dfe3b..1bbfd3c1e300 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -292,9 +292,8 @@ static void pseudo_lock_region_clear(struct pseudo_lock_region *plr)
  */
 static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
 {
-	struct cpu_cacheinfo *ci;
+	struct cacheinfo *ci;
 	int ret;
-	int i;
 
 	/* Pick the first cpu we find that is associated with the cache. */
 	plr->cpu = cpumask_first(&plr->d->cpu_mask);
@@ -306,15 +305,11 @@ static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
 		goto out_region;
 	}
 
-	ci = get_cpu_cacheinfo(plr->cpu);
-
-	plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
-
-	for (i = 0; i < ci->num_leaves; i++) {
-		if (ci->info_list[i].level == plr->s->res->cache_level) {
-			plr->line_size = ci->info_list[i].coherency_line_size;
-			return 0;
-		}
+	ci = get_cpu_cacheinfo_level(plr->cpu, plr->s->res->cache_level);
+	if (ci) {
+		plr->line_size = ci->coherency_line_size;
+		plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
+		return 0;
 	}
 
 	ret = -1;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 02f213f1c51c..cb68a121dabb 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1450,18 +1450,14 @@ static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
 unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
 				  struct rdt_domain *d, unsigned long cbm)
 {
-	struct cpu_cacheinfo *ci;
 	unsigned int size = 0;
-	int num_b, i;
+	struct cacheinfo *ci;
+	int num_b;
 
 	num_b = bitmap_weight(&cbm, r->cache.cbm_len);
-	ci = get_cpu_cacheinfo(cpumask_any(&d->cpu_mask));
-	for (i = 0; i < ci->num_leaves; i++) {
-		if (ci->info_list[i].level == r->cache_level) {
-			size = ci->info_list[i].size / r->cache.cbm_len * num_b;
-			break;
-		}
-	}
+	ci = get_cpu_cacheinfo_level(cpumask_any(&d->cpu_mask), r->cache_level);
+	if (ci)
+		size = ci->size / r->cache.cbm_len * num_b;
 
 	return size;
 }
-- 
2.45.0