Jeremy Linton <jeremy.linton@xxxxxxx> writes:
> Its possible that an ACPI system has multiple CPU types in it
> with differing PMU counters. Use the newly provided acpi_pmu routines
> to detect that case, and instantiate more than one set of counters.
>
> Signed-off-by: Jeremy Linton <jeremy.linton@xxxxxxx>
> ---
> drivers/perf/arm_pmu.c | 7 +++-
> drivers/perf/arm_pmu_acpi.c | 82 ++++++++++++++++-----------------------------
> 2 files changed, 35 insertions(+), 54 deletions(-)
>
> diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
> index 28cac3a..f94d279 100644
> --- a/drivers/perf/arm_pmu.c
> +++ b/drivers/perf/arm_pmu.c
> @@ -1044,7 +1044,12 @@ int arm_pmu_device_probe(struct platform_device *pdev,
> if (!ret)
> ret = init_fn(pmu);
> } else if (probe_table) {
> - ret = probe_plat_pmu(pmu, probe_table, read_cpuid_id());
> + if (acpi_disabled) {
> + /* use the current cpu. */
> + ret = probe_plat_pmu(pmu, probe_table,
> + read_cpuid_id());
> + } else
> + ret = probe_plat_pmu(pmu, probe_table, pdev->id);
> }
>
> if (ret) {
> diff --git a/drivers/perf/arm_pmu_acpi.c b/drivers/perf/arm_pmu_acpi.c
> index 482a54d..6f5df1a 100644
> --- a/drivers/perf/arm_pmu_acpi.c
> +++ b/drivers/perf/arm_pmu_acpi.c
> @@ -50,7 +50,7 @@ void __init arm_pmu_parse_acpi(int cpu, struct acpi_madt_generic_interrupt *gic)
> }
>
> /* Count number and type of CPU cores in the system. */
> -void __init arm_pmu_acpi_determine_cpu_types(struct list_head *pmus)
> +static void __init arm_pmu_acpi_determine_cpu_types(struct list_head *pmus)
> {
> int i;
>
> @@ -84,7 +84,7 @@ void __init arm_pmu_acpi_determine_cpu_types(struct list_head *pmus)
> * Registers the group of PMU interfaces which correspond to the 'last_cpu_id'.
> * This group utilizes 'count' resources in the 'res'.
> */
> -int __init arm_pmu_acpi_register_pmu(int count, struct resource *res,
> +static int __init arm_pmu_acpi_register_pmu(int count, struct resource *res,
> int last_cpu_id)
> {
> int i;
> @@ -130,7 +130,7 @@ int __init arm_pmu_acpi_register_pmu(int count, struct resource *res,
> * them to the resource structure. Return the number of GSI's contained
> * in the res structure, and the id of the last CPU/PMU we added.
> */
> -int __init arm_pmu_acpi_gsi_res(struct pmu_types *pmus,
> +static int __init arm_pmu_acpi_gsi_res(struct pmu_types *pmus,
> struct resource *res, int *last_cpu_id)
> {
> int i, count;
> @@ -169,63 +169,39 @@ int __init arm_pmu_acpi_gsi_res(struct pmu_types *pmus,
>
> static int __init pmu_acpi_init(void)
> {
> - struct platform_device *pdev;
> - struct pmu_irq *pirq = pmu_irqs;
> - struct resource *res, *r;
> + struct resource *res;
> int err = -ENOMEM;
> - int i, count, irq;
> + int count, cpu_id;
> + struct pmu_types *pmu, *safe_temp;
> + LIST_HEAD(pmus);
>
> if (acpi_disabled)
> return 0;
>
> - /* Must have irq for boot cpu, at least */
> - if (pirq->gsi == 0)
> - return -EINVAL;
> -
> - irq = acpi_register_gsi(NULL, pirq->gsi, pirq->trigger,
> - ACPI_ACTIVE_HIGH);
> -
> - if (irq_is_percpu(irq))
> - count = 1;
> - else
> - for (i = 1, count = 1; i < NR_CPUS; i++)
> - if (pmu_irqs[i].gsi)
> - ++count;
> -
> - pdev = platform_device_alloc(ARMV8_PMU_PDEV_NAME, -1);
> - if (!pdev)
> - goto err_free_gsi;
> -
> - res = kcalloc(count, sizeof(*res), GFP_KERNEL);
> - if (!res)
> - goto err_free_device;
> -
> - for (i = 0, r = res; i < count; i++, pirq++, r++) {
> - if (i)
> - irq = acpi_register_gsi(NULL, pirq->gsi, pirq->trigger,
> - ACPI_ACTIVE_HIGH);
> - r->start = r->end = irq;
> - r->flags = IORESOURCE_IRQ;
> - if (pirq->trigger == ACPI_EDGE_SENSITIVE)
> - r->flags |= IORESOURCE_IRQ_HIGHEDGE;
> - else
> - r->flags |= IORESOURCE_IRQ_HIGHLEVEL;
> + arm_pmu_acpi_determine_cpu_types(&pmus);
> +
> + list_for_each_entry_safe(pmu, safe_temp, &pmus, list) {
> + res = kcalloc(pmu->cpu_count,
> + sizeof(struct resource), GFP_KERNEL);
> +
> + /* for a given PMU type collect all the GSIs. */
> + if (res) {
> + count = arm_pmu_acpi_gsi_res(pmu, res,
> + &cpu_id);
> + /*
> + * register this set of interrupts
> + * with a new PMU device
> + */
> + err = arm_pmu_acpi_register_pmu(count, res, cpu_id);
> + kfree(res);
> + } else
> + pr_warn("PMU unable to allocate interrupt resource space\n");
> +
> + list_del(&pmu->list);
> + kfree(pmu);
> }
>
> - err = platform_device_add_resources(pdev, res, count);
> - if (!err)
> - err = platform_device_add(pdev);
> - kfree(res);
> - if (!err)
> - return 0;
> -
> -err_free_device:
> - platform_device_put(pdev);
> -
> -err_free_gsi:
> - for (i = 0; i < count; i++)
> - acpi_unregister_gsi(pmu_irqs[i].gsi);
> -
> return err;
> }
> +
> arch_initcall(pmu_acpi_init);
The changes to arm_acpi_pmu.c should be moved to the previous
patch. It'll help see introduction of functionality and it's use in one
patch - aiding review.
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