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Subject[PATCH v5] perf: arm_dsu: Support DSU ACPI devices
Date
Add support for probing device from ACPI node.
Each DSU ACPI node and its associated cpus are inside a cluster node.

Signed-off-by: Tuan Phan <tuanphan@os.amperecomputing.com>
---
Changes in v5:
- Used CONFIG_ACPI to fix compiling issue.

Changes in v4:
- Addressed Will's comments.

Changes in v3:
- Based on the latest ARM ACPI binding at: https://developer.arm.com/documentation/den0093/c/

Changes in v2:
- Removed IRQF_SHARED.
- Fixed ACPI runtime detection.

drivers/perf/arm_dsu_pmu.c | 61 +++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 55 insertions(+), 6 deletions(-)

diff --git a/drivers/perf/arm_dsu_pmu.c b/drivers/perf/arm_dsu_pmu.c
index 96ed93c..68d2891 100644
--- a/drivers/perf/arm_dsu_pmu.c
+++ b/drivers/perf/arm_dsu_pmu.c
@@ -11,6 +11,7 @@
#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>
@@ -603,18 +604,19 @@ static struct dsu_pmu *dsu_pmu_alloc(struct platform_device *pdev)
}

/**
- * 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);
@@ -631,6 +633,36 @@ static int dsu_pmu_dt_get_cpus(struct device_node *dev, cpumask_t *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;
+}
+
/*
* dsu_pmu_probe_pmu: Probe the PMU details on a CPU in the cluster.
*/
@@ -676,6 +708,7 @@ static int dsu_pmu_device_probe(struct platform_device *pdev)
{
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);

@@ -683,7 +716,16 @@ static int dsu_pmu_device_probe(struct platform_device *pdev)
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;
@@ -752,11 +794,19 @@ static const struct of_device_id dsu_pmu_of_match[] = {
{ .compatible = "arm,dsu-pmu", },
{},
};
+MODULE_DEVICE_TABLE(of, dsu_pmu_of_match);
+
+static const struct acpi_device_id dsu_pmu_acpi_match[] = {
+ { "ARMHD500", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, dsu_pmu_acpi_match);

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,
@@ -826,7 +876,6 @@ static void __exit dsu_pmu_exit(void)
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");
--
2.7.4
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