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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb 
 kernel/arch/powerpc/kernel/cacheinfo.c
....@@ -1,14 +1,13 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Processor cache information made available to userspace via sysfs;
34  * intended to be compatible with x86 intel_cacheinfo implementation.
45  *
56  * Copyright 2008 IBM Corporation
67  * Author: Nathan Lynch
7
- *
8
- * This program is free software; you can redistribute it and/or
9
- * modify it under the terms of the GNU General Public License version
10
- * 2 as published by the Free Software Foundation.
118  */
9
+
10
+#define pr_fmt(fmt) "cacheinfo: " fmt
1211 
1312 #include <linux/cpu.h>
1413 #include <linux/cpumask.h>
....@@ -20,6 +19,8 @@
2019 #include <linux/percpu.h>
2120 #include <linux/slab.h>
2221 #include <asm/prom.h>
22
+#include <asm/cputhreads.h>
23
+#include <asm/smp.h>
2324 
2425 #include "cacheinfo.h"
2526 
....@@ -167,7 +168,7 @@
167168 
168169 	list_for_each_entry(iter, &cache_list, list)
169170 		WARN_ONCE(iter->next_local == cache,
170
-			  "cache for %pOF(%s) refers to cache for %pOF(%s)\n",
171
+			  "cache for %pOFP(%s) refers to cache for %pOFP(%s)\n",
171172 			  iter->ofnode,
172173 			  cache_type_string(iter),
173174 			  cache->ofnode,
....@@ -179,7 +180,7 @@
179180 	if (!cache)
180181 		return;
181182 
182
-	pr_debug("freeing L%d %s cache for %pOF\n", cache->level,
183
+	pr_debug("freeing L%d %s cache for %pOFP\n", cache->level,
183184 		 cache_type_string(cache), cache->ofnode);
184185 
185186 	release_cache_debugcheck(cache);
....@@ -194,7 +195,7 @@
194195 
195196 	while (next) {
196197 		WARN_ONCE(cpumask_test_cpu(cpu, &next->shared_cpu_map),
197
-			  "CPU %i already accounted in %pOF(%s)\n",
198
+			  "CPU %i already accounted in %pOFP(%s)\n",
198199 			  cpu, next->ofnode,
199200 			  cache_type_string(next));
200201 		cpumask_set_cpu(cpu, &next->shared_cpu_map);
....@@ -351,11 +352,9 @@
351352 		CACHE_TYPE_UNIFIED_D : CACHE_TYPE_UNIFIED;
352353 }
353354 
354
-/*
355
- */
356355 static struct cache *cache_do_one_devnode_unified(struct device_node *node, int level)
357356 {
358
-	pr_debug("creating L%d ucache for %pOF\n", level, node);
357
+	pr_debug("creating L%d ucache for %pOFP\n", level, node);
359358 
360359 	return new_cache(cache_is_unified_d(node), level, node);
361360 }
....@@ -365,7 +364,7 @@
365364 {
366365 	struct cache *dcache, *icache;
367366 
368
-	pr_debug("creating L%d dcache and icache for %pOF\n", level,
367
+	pr_debug("creating L%d dcache and icache for %pOFP\n", level,
369368 		 node);
370369 
371370 	dcache = new_cache(CACHE_TYPE_DATA, level, node);
....@@ -421,12 +420,27 @@
421420 	}
422421 
423422 	smaller->next_local = bigger;
423
+
424
+	/*
425
+	 * The cache->next_local list sorts by level ascending:
426
+	 * L1d -> L1i -> L2 -> L3 ...
427
+	 */
428
+	WARN_ONCE((smaller->level == 1 && bigger->level > 2) ||
429
+		  (smaller->level > 1 && bigger->level != smaller->level + 1),
430
+		  "linking L%i cache %pOFP to L%i cache %pOFP; skipped a level?\n",
431
+		  smaller->level, smaller->ofnode, bigger->level, bigger->ofnode);
424432 }
425433 
426434 static void do_subsidiary_caches_debugcheck(struct cache *cache)
427435 {
428
-	WARN_ON_ONCE(cache->level != 1);
429
-	WARN_ON_ONCE(strcmp(cache->ofnode->type, "cpu"));
436
+	WARN_ONCE(cache->level != 1,
437
+		  "instantiating cache chain from L%d %s cache for "
438
+		  "%pOFP instead of an L1\n", cache->level,
439
+		  cache_type_string(cache), cache->ofnode);
440
+	WARN_ONCE(!of_node_is_type(cache->ofnode, "cpu"),
441
+		  "instantiating cache chain from node %pOFP of type '%s' "
442
+		  "instead of a cpu node\n", cache->ofnode,
443
+		  of_node_get_device_type(cache->ofnode));
430444 }
431445 
432446 static void do_subsidiary_caches(struct cache *cache)
....@@ -627,24 +641,65 @@
627641 static struct kobj_attribute cache_level_attr =
628642 	__ATTR(level, 0444, level_show, NULL);
629643 
630
-static ssize_t shared_cpu_map_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
644
+static unsigned int index_dir_to_cpu(struct cache_index_dir *index)
645
+{
646
+	struct kobject *index_dir_kobj = &index->kobj;
647
+	struct kobject *cache_dir_kobj = index_dir_kobj->parent;
648
+	struct kobject *cpu_dev_kobj = cache_dir_kobj->parent;
649
+	struct device *dev = kobj_to_dev(cpu_dev_kobj);
650
+
651
+	return dev->id;
652
+}
653
+
654
+/*
655
+ * On big-core systems, each core has two groups of CPUs each of which
656
+ * has its own L1-cache. The thread-siblings which share l1-cache with
657
+ * @cpu can be obtained via cpu_smallcore_mask().
658
+ */
659
+static const struct cpumask *get_big_core_shared_cpu_map(int cpu, struct cache *cache)
660
+{
661
+	if (cache->level == 1)
662
+		return cpu_smallcore_mask(cpu);
663
+
664
+	return &cache->shared_cpu_map;
665
+}
666
+
667
+static ssize_t
668
+show_shared_cpumap(struct kobject *k, struct kobj_attribute *attr, char *buf, bool list)
631669 {
632670 	struct cache_index_dir *index;
633671 	struct cache *cache;
634
-	int ret;
672
+	const struct cpumask *mask;
673
+	int cpu;
635674 
636675 	index = kobj_to_cache_index_dir(k);
637676 	cache = index->cache;
638677 
639
-	ret = scnprintf(buf, PAGE_SIZE - 1, "%*pb\n",
640
-			cpumask_pr_args(&cache->shared_cpu_map));
641
-	buf[ret++] = '\n';
642
-	buf[ret] = '\0';
643
-	return ret;
678
+	if (has_big_cores) {
679
+		cpu = index_dir_to_cpu(index);
680
+		mask = get_big_core_shared_cpu_map(cpu, cache);
681
+	} else {
682
+		mask  = &cache->shared_cpu_map;
683
+	}
684
+
685
+	return cpumap_print_to_pagebuf(list, buf, mask);
686
+}
687
+
688
+static ssize_t shared_cpu_map_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
689
+{
690
+	return show_shared_cpumap(k, attr, buf, false);
691
+}
692
+
693
+static ssize_t shared_cpu_list_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
694
+{
695
+	return show_shared_cpumap(k, attr, buf, true);
644696 }
645697 
646698 static struct kobj_attribute cache_shared_cpu_map_attr =
647699 	__ATTR(shared_cpu_map, 0444, shared_cpu_map_show, NULL);
700
+
701
+static struct kobj_attribute cache_shared_cpu_list_attr =
702
+	__ATTR(shared_cpu_list, 0444, shared_cpu_list_show, NULL);
648703 
649704 /* Attributes which should always be created -- the kobject/sysfs core
650705  * does this automatically via kobj_type->default_attrs.  This is the
....@@ -654,6 +709,7 @@
654709 	&cache_type_attr.attr,
655710 	&cache_level_attr.attr,
656711 	&cache_shared_cpu_map_attr.attr,
712
+	&cache_shared_cpu_list_attr.attr,
657713 	NULL,
658714 };
659715 
....@@ -705,13 +761,13 @@
705761 		rc = attr->show(&dir->kobj, attr, buf);
706762 		if (rc <= 0) {
707763 			pr_debug("not creating %s attribute for "
708
-				 "%pOF(%s) (rc = %zd)\n",
764
+				 "%pOFP(%s) (rc = %zd)\n",
709765 				 attr->attr.name, cache->ofnode,
710766 				 cache_type, rc);
711767 			continue;
712768 		}
713769 		if (sysfs_create_file(&dir->kobj, &attr->attr))
714
-			pr_debug("could not create %s attribute for %pOF(%s)\n",
770
+			pr_debug("could not create %s attribute for %pOFP(%s)\n",
715771 				 attr->attr.name, cache->ofnode, cache_type);
716772 	}
717773 
....@@ -726,23 +782,21 @@
726782 
727783 	index_dir = kzalloc(sizeof(*index_dir), GFP_KERNEL);
728784 	if (!index_dir)
729
-		goto err;
785
+		return;
730786 
731787 	index_dir->cache = cache;
732788 
733789 	rc = kobject_init_and_add(&index_dir->kobj, &cache_index_type,
734790 				  cache_dir->kobj, "index%d", index);
735
-	if (rc)
736
-		goto err;
791
+	if (rc) {
792
+		kobject_put(&index_dir->kobj);
793
+		return;
794
+	}
737795 
738796 	index_dir->next = cache_dir->index;
739797 	cache_dir->index = index_dir;
740798 
741799 	cacheinfo_create_index_opt_attrs(index_dir);
742
-
743
-	return;
744
-err:
745
-	kfree(index_dir);
746800 }
747801 
748802 static void cacheinfo_sysfs_populate(unsigned int cpu_id,
....@@ -829,7 +883,7 @@
829883 		struct cache *next = cache->next_local;
830884 
831885 		WARN_ONCE(!cpumask_test_cpu(cpu, &cache->shared_cpu_map),
832
-			  "CPU %i not accounted in %pOF(%s)\n",
886
+			  "CPU %i not accounted in %pOFP(%s)\n",
833887 			  cpu, cache->ofnode,
834888 			  cache_type_string(cache));
835889