From e636c8d336489bf3eed5878299e6cc045bbad077 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:17:29 +0000
Subject: [PATCH] debug lk
---
kernel/drivers/perf/arm_dsu_pmu.c | 88 +++++++++++++++++++++++++++++++++----------
1 files changed, 67 insertions(+), 21 deletions(-)
diff --git a/kernel/drivers/perf/arm_dsu_pmu.c b/kernel/drivers/perf/arm_dsu_pmu.c
index 660cb8a..1db8ecc 100644
--- a/kernel/drivers/perf/arm_dsu_pmu.c
+++ b/kernel/drivers/perf/arm_dsu_pmu.c
@@ -1,19 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* ARM DynamIQ Shared Unit (DSU) PMU driver
*
* Copyright (C) ARM Limited, 2017.
*
* Based on ARM CCI-PMU, ARMv8 PMU-v3 drivers.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
*/
#define PMUNAME "arm_dsu"
#define DRVNAME PMUNAME "_pmu"
#define pr_fmt(fmt) DRVNAME ": " fmt
+#include <linux/acpi.h>
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/bug.h>
@@ -562,13 +560,7 @@
return -EINVAL;
}
- if (has_branch_stack(event) ||
- event->attr.exclude_user ||
- event->attr.exclude_kernel ||
- event->attr.exclude_hv ||
- event->attr.exclude_idle ||
- event->attr.exclude_host ||
- event->attr.exclude_guest) {
+ if (has_branch_stack(event)) {
dev_dbg(dsu_pmu->pmu.dev, "Can't support filtering\n");
return -EINVAL;
}
@@ -612,18 +604,19 @@
}
/**
- * dsu_pmu_dt_get_cpus: Get the list of CPUs in the cluster.
+ * dsu_pmu_dt_get_cpus: Get the list of CPUs in the cluster
+ * from device tree.
*/
-static int dsu_pmu_dt_get_cpus(struct device_node *dev, cpumask_t *mask)
+static int dsu_pmu_dt_get_cpus(struct device *dev, cpumask_t *mask)
{
int i = 0, n, cpu;
struct device_node *cpu_node;
- n = of_count_phandle_with_args(dev, "cpus", NULL);
+ n = of_count_phandle_with_args(dev->of_node, "cpus", NULL);
if (n <= 0)
return -ENODEV;
for (; i < n; i++) {
- cpu_node = of_parse_phandle(dev, "cpus", i);
+ cpu_node = of_parse_phandle(dev->of_node, "cpus", i);
if (!cpu_node)
break;
cpu = of_cpu_node_to_id(cpu_node);
@@ -637,6 +630,36 @@
continue;
cpumask_set_cpu(cpu, mask);
}
+ return 0;
+}
+
+/**
+ * dsu_pmu_acpi_get_cpus: Get the list of CPUs in the cluster
+ * from ACPI.
+ */
+static int dsu_pmu_acpi_get_cpus(struct device *dev, cpumask_t *mask)
+{
+#ifdef CONFIG_ACPI
+ int cpu;
+
+ /*
+ * A dsu pmu node is inside a cluster parent node along with cpu nodes.
+ * We need to find out all cpus that have the same parent with this pmu.
+ */
+ for_each_possible_cpu(cpu) {
+ struct acpi_device *acpi_dev;
+ struct device *cpu_dev = get_cpu_device(cpu);
+
+ if (!cpu_dev)
+ continue;
+
+ acpi_dev = ACPI_COMPANION(cpu_dev);
+ if (acpi_dev &&
+ acpi_dev->parent == ACPI_COMPANION(dev)->parent)
+ cpumask_set_cpu(cpu, mask);
+ }
+#endif
+
return 0;
}
@@ -685,6 +708,7 @@
{
int irq, rc;
struct dsu_pmu *dsu_pmu;
+ struct fwnode_handle *fwnode = dev_fwnode(&pdev->dev);
char *name;
static atomic_t pmu_idx = ATOMIC_INIT(-1);
@@ -692,17 +716,24 @@
if (IS_ERR(dsu_pmu))
return PTR_ERR(dsu_pmu);
- rc = dsu_pmu_dt_get_cpus(pdev->dev.of_node, &dsu_pmu->associated_cpus);
+ if (IS_ERR_OR_NULL(fwnode))
+ return -ENOENT;
+
+ if (is_of_node(fwnode))
+ rc = dsu_pmu_dt_get_cpus(&pdev->dev, &dsu_pmu->associated_cpus);
+ else if (is_acpi_device_node(fwnode))
+ rc = dsu_pmu_acpi_get_cpus(&pdev->dev, &dsu_pmu->associated_cpus);
+ else
+ return -ENOENT;
+
if (rc) {
dev_warn(&pdev->dev, "Failed to parse the CPUs\n");
return rc;
}
irq = platform_get_irq(pdev, 0);
- if (irq < 0) {
- dev_warn(&pdev->dev, "Failed to find IRQ\n");
+ if (irq < 0)
return -EINVAL;
- }
name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_%d",
PMUNAME, atomic_inc_return(&pmu_idx));
@@ -735,6 +766,7 @@
.read = dsu_pmu_read,
.attr_groups = dsu_pmu_attr_groups,
+ .capabilities = PERF_PMU_CAP_NO_EXCLUDE,
};
rc = perf_pmu_register(&dsu_pmu->pmu, name, -1);
@@ -762,11 +794,22 @@
{ .compatible = "arm,dsu-pmu", },
{},
};
+MODULE_DEVICE_TABLE(of, dsu_pmu_of_match);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id dsu_pmu_acpi_match[] = {
+ { "ARMHD500", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, dsu_pmu_acpi_match);
+#endif
static struct platform_driver dsu_pmu_driver = {
.driver = {
.name = DRVNAME,
.of_match_table = of_match_ptr(dsu_pmu_of_match),
+ .acpi_match_table = ACPI_PTR(dsu_pmu_acpi_match),
+ .suppress_bind_attrs = true,
},
.probe = dsu_pmu_device_probe,
.remove = dsu_pmu_device_remove,
@@ -823,7 +866,11 @@
if (ret < 0)
return ret;
dsu_pmu_cpuhp_state = ret;
- return platform_driver_register(&dsu_pmu_driver);
+ ret = platform_driver_register(&dsu_pmu_driver);
+ if (ret)
+ cpuhp_remove_multi_state(dsu_pmu_cpuhp_state);
+
+ return ret;
}
static void __exit dsu_pmu_exit(void)
@@ -835,7 +882,6 @@
module_init(dsu_pmu_init);
module_exit(dsu_pmu_exit);
-MODULE_DEVICE_TABLE(of, dsu_pmu_of_match);
MODULE_DESCRIPTION("Perf driver for ARM DynamIQ Shared Unit");
MODULE_AUTHOR("Suzuki K Poulose <suzuki.poulose@arm.com>");
MODULE_LICENSE("GPL v2");
--
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