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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/linux/cacheinfo.h
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@@ -3,6 +3,7 @@
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 #define _LINUX_CACHEINFO_H
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 #include <linux/bitops.h>
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+#include <linux/cpu.h>
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 #include <linux/cpumask.h>
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 #include <linux/smp.h>
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@@ -16,6 +17,8 @@
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 	CACHE_TYPE_SEPARATE = CACHE_TYPE_INST | CACHE_TYPE_DATA,
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 	CACHE_TYPE_UNIFIED = BIT(2),
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 };
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+
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+extern unsigned int coherency_max_size;
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 /**
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  * struct cacheinfo - represent a cache leaf node
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@@ -99,4 +102,24 @@
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 const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);
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+/*
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+ * Get the id of the cache associated with @cpu at level @level.
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+ * cpuhp lock must be held.
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+ */
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+static inline int get_cpu_cacheinfo_id(int cpu, int level)
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+{
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+	struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
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+	int i;
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+
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+	for (i = 0; i < ci->num_leaves; i++) {
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+		if (ci->info_list[i].level == level) {
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+			if (ci->info_list[i].attributes & CACHE_ID)
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+				return ci->info_list[i].id;
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+			return -1;
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+		}
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+	}
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+
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+	return -1;
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+}
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+
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 #endif /* _LINUX_CACHEINFO_H */