LinuxLists.cc - [PATCH v2] perf: arm_dsu: Support DSU ACPI devices.

2020-05-11 20:35:22

Subject: [PATCH v2] perf: arm_dsu: Support DSU ACPI devices.

Add ACPI node probing device support. Each DSU ACPI node
defines a "cpus" package with a per cpu MPIDR element.

Signed-off-by: Tuan Phan <[email protected]>
---
Changes in v2:
- Removed IRQF_SHARED.
- Fixed ACPI runtime detection.

The ACPI binding spec for DSU ACPI node is under beta and located
in ARM server group under project "ACPI on ARM".

drivers/perf/arm_dsu_pmu.c | 71 ++++++++++++++++++++++++++++++++++++++++------
1 file changed, 63 insertions(+), 8 deletions(-)

diff --git a/drivers/perf/arm_dsu_pmu.c b/drivers/perf/arm_dsu_pmu.c
index 70968c8..784d177 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 +604,21 @@ 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 platform_device *pdev)
{
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);
@@ -626,11 +630,54 @@ 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;
}

+/**
+ * dsu_pmu_acpi_get_cpus: Get the list of CPUs in the cluster
+ * from ACPI.
+ */
+static int dsu_pmu_acpi_get_cpus(struct platform_device *pdev)
+{
+ 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_PACKAGE, &obj);
+ if (ret < 0)
+ return ret;
+
+ 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;
+}
+
+static int dsu_pmu_platform_get_cpus(struct platform_device *pdev)
+{
+ int ret = -ENOENT;
+ struct fwnode_handle *fwnode = dev_fwnode(&pdev->dev);
+
+ if (IS_ERR_OR_NULL(fwnode))
+ return ret;
+
+ if (is_of_node(fwnode))
+ ret = dsu_pmu_dt_get_cpus(pdev);
+ else if (is_acpi_device_node(fwnode))
+ ret = dsu_pmu_acpi_get_cpus(pdev);
+
+ return ret;
+}
+
/*
* dsu_pmu_probe_pmu: Probe the PMU details on a CPU in the cluster.
*/
@@ -683,7 +730,9 @@ 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_platform_get_cpus(pdev);
if (rc) {
dev_warn(&pdev->dev, "Failed to parse the CPUs\n");
return rc;
@@ -707,7 +756,6 @@ 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 +802,19 @@ 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 +883,6 @@ 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 <[email protected]>");
MODULE_LICENSE("GPL v2");
--
2.7.4

2020-05-18 17:23:31

by Will Deacon

[permalink] [raw]

Subject: Re: [PATCH v2] perf: arm_dsu: Support DSU ACPI devices.

On Mon, May 11, 2020 at 01:32:40PM -0700, Tuan Phan wrote:
> Add ACPI node probing device support. Each DSU ACPI node
> defines a "cpus" package with a per cpu MPIDR element.
>
> Signed-off-by: Tuan Phan <[email protected]>
> ---
> Changes in v2:
> - Removed IRQF_SHARED.
> - Fixed ACPI runtime detection.
>
> The ACPI binding spec for DSU ACPI node is under beta and located
> in ARM server group under project "ACPI on ARM".
>
> drivers/perf/arm_dsu_pmu.c | 71 ++++++++++++++++++++++++++++++++++++++++------
> 1 file changed, 63 insertions(+), 8 deletions(-)

I've added Suzuki to cc, because I'd like his ack on this before I merge it.

Thanks,

Will

> diff --git a/drivers/perf/arm_dsu_pmu.c b/drivers/perf/arm_dsu_pmu.c
> index 70968c8..784d177 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 +604,21 @@ 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 platform_device *pdev)
> {
> 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);
> @@ -626,11 +630,54 @@ 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;
> }
>
> +/**
> + * dsu_pmu_acpi_get_cpus: Get the list of CPUs in the cluster
> + * from ACPI.
> + */
> +static int dsu_pmu_acpi_get_cpus(struct platform_device *pdev)
> +{
> + 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_PACKAGE, &obj);
> + if (ret < 0)
> + return ret;
> +
> + 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;
> +}
> +
> +static int dsu_pmu_platform_get_cpus(struct platform_device *pdev)
> +{
> + int ret = -ENOENT;
> + struct fwnode_handle *fwnode = dev_fwnode(&pdev->dev);
> +
> + if (IS_ERR_OR_NULL(fwnode))
> + return ret;
> +
> + if (is_of_node(fwnode))
> + ret = dsu_pmu_dt_get_cpus(pdev);
> + else if (is_acpi_device_node(fwnode))
> + ret = dsu_pmu_acpi_get_cpus(pdev);
> +
> + return ret;
> +}
> +
> /*
> * dsu_pmu_probe_pmu: Probe the PMU details on a CPU in the cluster.
> */
> @@ -683,7 +730,9 @@ 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_platform_get_cpus(pdev);
> if (rc) {
> dev_warn(&pdev->dev, "Failed to parse the CPUs\n");
> return rc;
> @@ -707,7 +756,6 @@ 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 +802,19 @@ 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 +883,6 @@ 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 <[email protected]>");
> MODULE_LICENSE("GPL v2");
> --
> 2.7.4
>

2020-05-21 14:00:31

by Sudeep Holla

[permalink] [raw]

Subject: Re: [PATCH v2] perf: arm_dsu: Support DSU ACPI devices.

2020-05-21 15:53:34

by Tuan Phan

[permalink] [raw]

Subject: Re: [PATCH v2] perf: arm_dsu: Support DSU ACPI devices.

> On May 21, 2020, at 6:55 AM, Sudeep Holla <[email protected]> wrote:
>
> On Mon, May 11, 2020 at 01:32:40PM -0700, Tuan Phan wrote:
>> Add ACPI node probing device support. Each DSU ACPI node
>> defines a "cpus" package with a per cpu MPIDR element.
>>
>> Signed-off-by: Tuan Phan <[email protected]>
>> ---
>> Changes in v2:
>> - Removed IRQF_SHARED.
>> - Fixed ACPI runtime detection.
>>
>> The ACPI binding spec for DSU ACPI node is under beta and located
>> in ARM server group under project "ACPI on ARM".
>>
>> drivers/perf/arm_dsu_pmu.c | 71 ++++++++++++++++++++++++++++++++++++++++------
>> 1 file changed, 63 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/perf/arm_dsu_pmu.c b/drivers/perf/arm_dsu_pmu.c
>> index 70968c8..784d177 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 +604,21 @@ 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 platform_device *pdev)
>> {
>> 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);
>> @@ -626,11 +630,54 @@ 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;
>> }
>>
>> +/**
>> + * dsu_pmu_acpi_get_cpus: Get the list of CPUs in the cluster
>> + * from ACPI.
>> + */
>> +static int dsu_pmu_acpi_get_cpus(struct platform_device *pdev)
>> +{
>> + 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_PACKAGE, &obj);
>
> I don't see any property "cpus" in the document:
> DEN 0093 A (Generic ACPI for Arm Components 1.0) [1]
>
> Is there any newer updates that I need to look at ?
>
There is a newer DEN 0093 A version but it has not been public yet. Let abandon this
patch and I will post new one when the document has been finalized and available to public.

Thanks,

> --
> Regards,
> Sudeep
>
> [1] https://static.docs.arm.com/den0093/a/DEN0093_ACPI_Arm_Components_1.0.pdf

2020-05-22 10:43:04

by Suzuki K Poulose

[permalink] [raw]

Subject: Re: [PATCH v2] perf: arm_dsu: Support DSU ACPI devices.

Will,

Thanks for the Cc.

On 05/18/2020 06:21 PM, Will Deacon wrote:
> On Mon, May 11, 2020 at 01:32:40PM -0700, Tuan Phan wrote:
>> Add ACPI node probing device support. Each DSU ACPI node
>> defines a "cpus" package with a per cpu MPIDR element.

I think there is a bit of confusion around the affinity listing.
I am getting this clarified with the architects.

Cheers
Suzuki

2020-05-26 12:20:03

by Will Deacon

[permalink] [raw]

Subject: Re: [PATCH v2] perf: arm_dsu: Support DSU ACPI devices.

On Fri, May 22, 2020 at 11:45:56AM +0100, Suzuki K Poulose wrote:
> Will,
>
> Thanks for the Cc.
>
> On 05/18/2020 06:21 PM, Will Deacon wrote:
> > On Mon, May 11, 2020 at 01:32:40PM -0700, Tuan Phan wrote:
> > > Add ACPI node probing device support. Each DSU ACPI node
> > > defines a "cpus" package with a per cpu MPIDR element.
>
> I think there is a bit of confusion around the affinity listing.
> I am getting this clarified with the architects.

Thanks, Suzuki. I'll hold off until that's resolved, then.

Will