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From: Rob Herring <robh@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	James Morse <james.morse@arm.com>,
	Jeremy Linton <jeremy.linton@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Sudeep Holla <sudeep.holla@arm.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Len Brown <lenb@kernel.org>,
	devicetree@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: [PATCH 6/6] cacheinfo: Add cacheinfo_get_cache_affinity() function
Date: Thu, 16 Dec 2021 17:31:25 -0600	[thread overview]
Message-ID: <20211216233125.1130793-7-robh@kernel.org> (raw)
In-Reply-To: <20211216233125.1130793-1-robh@kernel.org>

Add a cacheinfo_get_cache_affinity() function to retrieve the CPU affinity
mask for a given cache identified by level and cache id.

This is needed by Arm MPAM to get the CPU affinity of MPAM enabled caches.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 include/linux/cacheinfo.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 37652cfdd8dc..5e72420cdc75 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -123,4 +123,28 @@ static inline int get_cpu_cacheinfo_id(int cpu, int level)
 	return -1;
 }
 
+/*
+ * Get the CPU affinity of the cache associated with @cpu at level @level and
+ * with identifier @id.
+ * cpuhp lock must be held.
+ */
+static inline int cacheinfo_get_cache_affinity(int cpu, int level, int id,
+					       cpumask_t *mask)
+{
+	struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
+	int i;
+
+	for (i = 0; ci->info_list && i < ci->num_leaves; i++) {
+		if ((ci->info_list[i].level == level) &&
+		    (ci->info_list[i].attributes & CACHE_ID) &&
+		    (ci->info_list[i].id == id)) {
+			cpumask_copy(mask, &ci->info_list[i].cpu_affinity_map);
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+
 #endif /* _LINUX_CACHEINFO_H */
-- 
2.32.0


WARNING: multiple messages have this Message-ID (diff)
From: Rob Herring <robh@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	James Morse <james.morse@arm.com>,
	Jeremy Linton <jeremy.linton@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Sudeep Holla <sudeep.holla@arm.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Len Brown <lenb@kernel.org>,
	devicetree@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: [PATCH 6/6] cacheinfo: Add cacheinfo_get_cache_affinity() function
Date: Thu, 16 Dec 2021 17:31:25 -0600	[thread overview]
Message-ID: <20211216233125.1130793-7-robh@kernel.org> (raw)
In-Reply-To: <20211216233125.1130793-1-robh@kernel.org>

Add a cacheinfo_get_cache_affinity() function to retrieve the CPU affinity
mask for a given cache identified by level and cache id.

This is needed by Arm MPAM to get the CPU affinity of MPAM enabled caches.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 include/linux/cacheinfo.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 37652cfdd8dc..5e72420cdc75 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -123,4 +123,28 @@ static inline int get_cpu_cacheinfo_id(int cpu, int level)
 	return -1;
 }
 
+/*
+ * Get the CPU affinity of the cache associated with @cpu at level @level and
+ * with identifier @id.
+ * cpuhp lock must be held.
+ */
+static inline int cacheinfo_get_cache_affinity(int cpu, int level, int id,
+					       cpumask_t *mask)
+{
+	struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
+	int i;
+
+	for (i = 0; ci->info_list && i < ci->num_leaves; i++) {
+		if ((ci->info_list[i].level == level) &&
+		    (ci->info_list[i].attributes & CACHE_ID) &&
+		    (ci->info_list[i].id == id)) {
+			cpumask_copy(mask, &ci->info_list[i].cpu_affinity_map);
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+
 #endif /* _LINUX_CACHEINFO_H */
-- 
2.32.0


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  parent reply	other threads:[~2021-12-16 23:31 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-16 23:31 [PATCH 0/6] cacheinfo: CPU affinity and Devicetree 'id' support Rob Herring
2021-12-16 23:31 ` Rob Herring
2021-12-16 23:31 ` [PATCH 1/6] cacheinfo: Allow for >32-bit cache 'id' Rob Herring
2021-12-16 23:31   ` Rob Herring
2021-12-16 23:31 ` [PATCH 2/6] cacheinfo: Set cache 'id' based on DT data Rob Herring
2021-12-16 23:31   ` Rob Herring
2021-12-17 16:57   ` Robin Murphy
2021-12-17 16:57     ` Robin Murphy
2021-12-17 18:14     ` Rob Herring
2021-12-17 18:14       ` Rob Herring
2021-12-17 19:03       ` Sudeep Holla
2021-12-17 19:03         ` Sudeep Holla
2021-12-17 19:08         ` Sudeep Holla
2021-12-17 19:08           ` Sudeep Holla
2021-12-17 19:26         ` Rob Herring
2021-12-17 19:26           ` Rob Herring
2021-12-17 20:28           ` Jeremy Linton
2021-12-17 20:28             ` Jeremy Linton
2021-12-17 19:08       ` Robin Murphy
2021-12-17 19:08         ` Robin Murphy
2021-12-17 19:35         ` Rob Herring
2021-12-17 19:35           ` Rob Herring
2021-12-17 20:22           ` Jeremy Linton
2021-12-17 20:22             ` Jeremy Linton
2021-12-17 21:13           ` Robin Murphy
2021-12-17 21:13             ` Robin Murphy
2021-12-16 23:31 ` [PATCH 3/6] cacheinfo: Add cpu_affinity_map to store affinity for all CPUs Rob Herring
2021-12-16 23:31   ` Rob Herring
2021-12-16 23:31 ` [PATCH 4/6] ACPI / PPTT: Populate the cacheinfo.cpu_affinity_map Rob Herring
2021-12-16 23:31   ` Rob Herring
2021-12-16 23:31 ` [PATCH 5/6] cacheinfo: Use cpu_affinity_map for populating shared_cpu_map Rob Herring
2021-12-16 23:31   ` Rob Herring
2021-12-16 23:31 ` Rob Herring [this message]
2021-12-16 23:31   ` [PATCH 6/6] cacheinfo: Add cacheinfo_get_cache_affinity() function Rob Herring
2021-12-21  9:31 ` [PATCH 0/6] cacheinfo: CPU affinity and Devicetree 'id' support Greg Kroah-Hartman
2021-12-21  9:31   ` Greg Kroah-Hartman

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