linux-kernel - [PATCH v1 7/7] [NOT-FOR-MERGE] test managed irqs affinity adjustment

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Date: Thu, 16 May 2024 22:04:37 +0300
From: Costa Shulyupin <costa.shul@...hat.com>
To: longman@...hat.com,
	pauld@...hat.com,
	juri.lelli@...hat.com,
	prarit@...hat.com,
	vschneid@...hat.com,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Frederic Weisbecker <frederic@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Zefan Li <lizefan.x@...edance.com>,
	Tejun Heo <tj@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Petr Mladek <pmladek@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yoann Congal <yoann.congal@...le.fr>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Nhat Pham <nphamcs@...il.com>,
	Costa Shulyupin <costa.shul@...hat.com>,
	linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: [PATCH v1 7/7] [NOT-FOR-MERGE] test managed irqs affinity adjustment

Kernel module to generatemanaged irqs for the test
and shell commands.

Signed-off-by: Costa Shulyupin <costa.shul@...hat.com>
---
 tests/managed_irq.c | 71 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 tests/managed_irq.c

diff --git a/tests/managed_irq.c b/tests/managed_irq.c
new file mode 100644
index 0000000000000..fd4e91e44e59d
--- /dev/null
+++ b/tests/managed_irq.c
@@ -0,0 +1,71 @@
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+
+/*
+ * Testing instructions:
+ *
+ * isolate=1
+ * insmod managed_irq.ko test_cpu=$isolate
+ * cd /sys/fs/cgroup/
+ * echo +cpuset > cgroup.subtree_control
+ * mkdir test
+ * echo isolated > test/cpuset.cpus.partition
+ * echo $isolate > test/cpuset.cpus
+ * read test_irq < /sys/module/managed_irq/parameters/test_irq
+ *
+ * cat /proc/irq/$test_irq/smp_affinity_list
+ *
+ * read affinity < /proc/irq/$test_irq/smp_affinity
+ * test 0 -ne $((0x$affinity & 1 << $isolate)) && echo FAIL | PASS
+ *
+ * Assure that irq affinity doesn't contain isolated cpu.
+ */
+
+static int test_cpu = 1;
+module_param(test_cpu, int, 0444);
+
+static int test_irq;
+module_param(test_irq, int, 0444);
+
+static irqreturn_t test_irq_cb(int irq, void *dev_id)
+{
+	return IRQ_HANDLED;
+}
+
+static int test_set_affinity(struct irq_data *d, const struct cpumask *m, bool f)
+{
+	irq_data_update_effective_affinity(d, m);
+	return 0;
+}
+
+static int make_test_irq(void)
+{
+	struct irq_affinity_desc a = {
+		mask: *cpumask_of(test_cpu),
+		is_managed: true
+	};
+	int test_irq = __irq_alloc_descs(-1, 1, 1, 0, THIS_MODULE, &a);
+	static struct irq_chip test_chip = { .irq_set_affinity =
+						     test_set_affinity };
+
+	irq_set_chip(test_irq, &test_chip);
+	irq_set_status_flags(test_irq, IRQ_MOVE_PCNTXT);
+	pr_debug("test_irq=%d\n", test_irq);
+	int err = request_irq(test_irq, test_irq_cb, 0, "test_affinity", 0);
+
+	if (err)
+		pr_err("%d\n", err);
+
+	return test_irq;
+}
+
+static int managed_irq_init(void)
+{
+	test_irq = make_test_irq();
+	return 0;
+}
+
+module_init(managed_irq_init);
+
+MODULE_LICENSE("GPL");
-- 
2.45.0