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perf: arm_dsu: Support DSU ACPI devices 

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>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/1600106656-9542-1-git-send-email-tuanphan@os.amperecomputing.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Tuan Phan 2020-09-14 11:04:16 -07:00 committed by Will Deacon
parent 44fdf4ed26
commit 2b694fc92a
1 changed files with 57 additions and 6 deletions
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63
drivers/perf/arm_dsu_pmu.c
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@ -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 +794,21 @@ static const struct of_device_id dsu_pmu_of_match[] = {
{ .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,
@ -826,7 +878,6 @@ 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");