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From:   Tuan Phan <tuanphan@os.amperecomputing.com>
Cc:     patches@amperecomputing.com, Will Deacon <will@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH 2/2] perf: arm_dsu: Support DSU ACPI devices.
Date:   Tue, 17 Mar 2020 17:28:43 -0700
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Add support for probing device from ACPI node.
Each DSU ACPI node defines "cpus" package which
each element is the MPIDR of associated cpu.

Signed-off-by: Tuan Phan <tuanphan@os.amperecomputing.com>
---
 drivers/perf/arm_dsu_pmu.c | 53 +++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 45 insertions(+), 8 deletions(-)

diff --git a/drivers/perf/arm_dsu_pmu.c b/drivers/perf/arm_dsu_pmu.c
index 2622900..6ef762c 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 +604,22 @@ 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_get_cpus: Get the list of CPUs in the cluster.
  */
-static int dsu_pmu_dt_get_cpus(struct device_node *dev, cpumask_t *mask)
+static int dsu_pmu_get_cpus(struct platform_device *pdev)
 {
+#ifndef CONFIG_ACPI
+	/* Get the list of CPUs from device tree */
 	int i = 0, n, cpu;
 	struct device_node *cpu_node;
+	struct dsu_pmu *dsu_pmu =
+		(struct dsu_pmu *) platform_get_drvdata(pdev);
 
-	n = of_count_phandle_with_args(dev, "cpus", NULL);
+	n = of_count_phandle_with_args(pdev->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(pdev->dev.of_node, "cpus", i);
 		if (!cpu_node)
 			break;
 		cpu = of_cpu_node_to_id(cpu_node);
@@ -626,9 +631,33 @@ static int dsu_pmu_dt_get_cpus(struct device_node *dev, cpumask_t *mask)
 		 */
 		if (cpu < 0)
 			continue;
-		cpumask_set_cpu(cpu, mask);
+		cpumask_set_cpu(cpu, &dsu_pmu->associated_cpus);
 	}
 	return 0;
+#else /* CONFIG_ACPI */
+	int i, cpu, ret;
+	const union acpi_object *obj;
+	struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
+	struct dsu_pmu *dsu_pmu =
+		(struct dsu_pmu *) platform_get_drvdata(pdev);
+
+	ret = acpi_dev_get_property(adev, "cpus", ACPI_TYPE_ANY, &obj);
+	if (ret < 0)
+		return -EINVAL;
+
+	if (obj->type != ACPI_TYPE_PACKAGE)
+		return -EINVAL;
+
+	for (i = 0; i < obj->package.count; i++) {
+		/* Each element is the MPIDR of associated cpu */
+		for_each_possible_cpu(cpu) {
+			if (cpu_physical_id(cpu) ==
+				obj->package.elements[i].integer.value)
+				cpumask_set_cpu(cpu, &dsu_pmu->associated_cpus);
+		}
+	}
+	return 0;
+#endif
 }
 
 /*
@@ -683,7 +712,9 @@ 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);
+	platform_set_drvdata(pdev, dsu_pmu);
+
+	rc = dsu_pmu_get_cpus(pdev);
 	if (rc) {
 		dev_warn(&pdev->dev, "Failed to parse the CPUs\n");
 		return rc;
@@ -707,7 +738,6 @@ static int dsu_pmu_device_probe(struct platform_device *pdev)
 	}
 
 	dsu_pmu->irq = irq;
-	platform_set_drvdata(pdev, dsu_pmu);
 	rc = cpuhp_state_add_instance(dsu_pmu_cpuhp_state,
 						&dsu_pmu->cpuhp_node);
 	if (rc)
@@ -754,11 +784,19 @@ 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),
 	},
 	.probe = dsu_pmu_device_probe,
 	.remove = dsu_pmu_device_remove,
@@ -827,7 +865,6 @@ 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