linux-kernel - [PATCH 02/33] drivers: base: cacheinfo: Add helper to find the cache size from cpu+level

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Message-Id: <20250822153048.2287-37-james.morse@arm.com>
Date: Fri, 22 Aug 2025 15:30:17 +0000
From: James Morse <james.morse@....com>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-acpi@...r.kernel.org,
	devicetree@...r.kernel.org
Cc: James Morse <james.morse@....com>,
	shameerali.kolothum.thodi@...wei.com,
	D Scott Phillips OS <scott@...amperecomputing.com>,
	carl@...amperecomputing.com,
	lcherian@...vell.com,
	bobo.shaobowang@...wei.com,
	tan.shaopeng@...itsu.com,
	baolin.wang@...ux.alibaba.com,
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	David Hildenbrand <david@...hat.com>,
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	Jonathan Cameron <jonathan.cameron@...wei.com>,
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	Krzysztof Kozlowski <krzk+dt@...nel.org>,
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	Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH 02/33] drivers: base: cacheinfo: Add helper to find the cache size from cpu+level

MPAM needs to know the size of a cache associated with a particular CPU.
The DT/ACPI agnostic way of doing this is to ask cacheinfo.

Add a helper to do this.

Signed-off-by: James Morse <james.morse@....com>

---
Changes since v1:
 * Converted to kdoc.
 * Simplified helper to use get_cpu_cacheinfo_level().
---
 include/linux/cacheinfo.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 2dcbb69139e9..e12d6f2c6a57 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -148,6 +148,21 @@ static inline int get_cpu_cacheinfo_id(int cpu, int level)
 	return ci ? ci->id : -1;
 }
 
+/**
+ * get_cpu_cacheinfo_size() - Get the size of the cache.
+ * @cpu:      The cpu that is associated with the cache.
+ * @level:    The level of the cache as seen by @cpu.
+ *
+ * Callers must hold the cpuhp lock.
+ * Returns the cache-size on success, or 0 for an error.
+ */
+static inline unsigned int get_cpu_cacheinfo_size(int cpu, int level)
+{
+	struct cacheinfo *ci = get_cpu_cacheinfo_level(cpu, level);
+
+	return ci ? ci->size : 0;
+}
+
 #if defined(CONFIG_ARM64) || defined(CONFIG_ARM)
 #define use_arch_cache_info()	(true)
 #else
-- 
2.20.1