[PATCH v4 2/2] drivers/perf: hisi: Add Support for CPA PMU
liuqi (BA)
liuqi115 at huawei.com
Thu Apr 7 18:47:44 PDT 2022
On 2022/4/7 21:10, John Garry wrote:
> On 07/04/2022 13:46, Qi Liu wrote:
>> On HiSilicon Hip09 platform, there is a CPA (Coherency Protocol Agent) on
>> each SICL (Super I/O Cluster) which implements packet format translation,
>> route parsing and traffic statistics.
>>
>> CPA PMU has 8 PMU counters and interrupt is supported to handle counter
>> overflow. Let's support its driver under the framework of HiSilicon PMU
>> driver.
>>
>> Signed-off-by: Qi Liu <liuqi115 at huawei.com>
>
> This looks ok, but I still have a few nitpicks. Regardless,
>
> Reviewed-by: John Garry <john.garry at huawei.com>
>
Hi John,
Thanks for the comments. some replies inline.
>> ---
>> drivers/perf/hisilicon/Makefile | 2 +-
>> drivers/perf/hisilicon/hisi_uncore_cpa_pmu.c | 401 +++++++++++++++++++
>> include/linux/cpuhotplug.h | 1 +
>> 3 files changed, 403 insertions(+), 1 deletion(-)
>> create mode 100644 drivers/perf/hisilicon/hisi_uncore_cpa_pmu.c
>>
>> diff --git a/drivers/perf/hisilicon/Makefile
>> b/drivers/perf/hisilicon/Makefile
>> index 506ed39e3266..6be83517acaa 100644
>> --- a/drivers/perf/hisilicon/Makefile
>> +++ b/drivers/perf/hisilicon/Makefile
>> @@ -1,6 +1,6 @@
>> # SPDX-License-Identifier: GPL-2.0-only
>> obj-$(CONFIG_HISI_PMU) += hisi_uncore_pmu.o hisi_uncore_l3c_pmu.o \
>> hisi_uncore_hha_pmu.o hisi_uncore_ddrc_pmu.o
>> hisi_uncore_sllc_pmu.o \
>> - hisi_uncore_pa_pmu.o
>> + hisi_uncore_pa_pmu.o hisi_uncore_cpa_pmu.o
>> obj-$(CONFIG_HISI_PCIE_PMU) += hisi_pcie_pmu.o
>> diff --git a/drivers/perf/hisilicon/hisi_uncore_cpa_pmu.c
>> b/drivers/perf/hisilicon/hisi_uncore_cpa_pmu.c
>> new file mode 100644
>> index 000000000000..d6b8e4037076
>> --- /dev/null
>> +++ b/drivers/perf/hisilicon/hisi_uncore_cpa_pmu.c
>> @@ -0,0 +1,401 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * HiSilicon SoC CPA(Coherency Protocol Agent) hardware event
>> counters support
>> + *
>> + * Copyright (C) 2022 HiSilicon Limited
>> + * Author: Qi Liu <liuqi115 at huawei.com>
>> + *
>> + * This code is based on the uncore PMUs like arm-cci and arm-ccn.
>> + */
>> +
>> +#define pr_fmt(fmt) "cpa pmu: " fmt
>
> comment: you could add "hisi" but maybe it becomes too long
>
yes, so we'll keep "cpa pmu" here, thanks.
>> +#include <linux/acpi.h>
>> +#include <linux/bug.h>
>> +#include <linux/cpuhotplug.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/irq.h>
>> +#include <linux/list.h>
>> +#include <linux/smp.h>
>> +
>> +#include "hisi_uncore_pmu.h"
>> +
>> +/* CPA register definition */
>> +#define CPA_PERF_CTRL 0x1c00
>> +#define CPA_EVENT_CTRL 0x1c04
>> +#define CPA_INT_MASK 0x1c70
>> +#define CPA_INT_STATUS 0x1c78
>> +#define CPA_INT_CLEAR 0x1c7c
>> +#define CPA_EVENT_TYPE0 0x1c80
>> +#define CPA_VERSION 0x1cf0
>> +#define CPA_CNT0_LOWER 0x1d00
>> +#define CPA_CFG_REG 0x0534
>> +
>> +/* CPA operation command */
>> +#define CPA_PERF_CTRL_EN BIT_ULL(0)
>> +#define CPA_EVTYPE_MASK 0xffUL
>> +#define CPA_PM_CTRL BIT_ULL(9)
>> +
>> +/* CPA has 8-counters */
>> +#define CPA_NR_COUNTERS 0x8
>> +#define CPA_COUNTER_BITS 64
>> +#define CPA_NR_EVENTS 0xff
>> +#define CPA_REG_OFFSET 0x8
>> +
[...]
>> +static int hisi_cpa_pmu_probe(struct platform_device *pdev)
>> +{
>> + struct hisi_pmu *cpa_pmu;
>> + char *name;
>> + int ret;
>> +
>> + cpa_pmu = devm_kzalloc(&pdev->dev, sizeof(*cpa_pmu), GFP_KERNEL);
>> + if (!cpa_pmu)
>> + return -ENOMEM;
>> +
>> + ret = hisi_cpa_pmu_dev_probe(pdev, cpa_pmu);
>> + if (ret)
>> + return ret;
>> +
>> + /* Power Management should be disabled before using CPA PMU. */
>> + hisi_cpa_pmu_disable_pm(cpa_pmu);
>> +
>
> nit: we call hisi_cpa_pmu_enable_pm() in the remove function to restore
> to the same state as we had before loading the driver. However we don't
> do the same for a failed probe later.
>
thanks, I'll add this next version.
>> + ret = cpuhp_state_add_instance(CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE,
>> + &cpa_pmu->node);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Error %d registering hotplug\n", ret);
>> + return ret;
>> + }
>> +
>> + name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
>> "hisi_sicl%d_cpa%u", cpa_pmu->sicl_id,
>> + cpa_pmu->index_id);
>
> nit: should check non-NULL here
>
got it, will add this, thanks.
Qi
>> +
>> + cpa_pmu->pmu = (struct pmu) {
>> + .name = name,
>> + .module = THIS_MODULE,
>> + .task_ctx_nr = perf_invalid_context,
>> + .event_init = hisi_uncore_pmu_event_init,
>> + .pmu_enable = hisi_uncore_pmu_enable,
>> + .pmu_disable = hisi_uncore_pmu_disable,
>> + .add = hisi_uncore_pmu_add,
>> + .del = hisi_uncore_pmu_del,
>> + .start = hisi_uncore_pmu_start,
>> + .stop = hisi_uncore_pmu_stop,
>> + .read = hisi_uncore_pmu_read,
>> + .attr_groups = cpa_pmu->pmu_events.attr_groups,
>> + .capabilities = PERF_PMU_CAP_NO_EXCLUDE,
>> + };
>> +
>> + ret = perf_pmu_register(&cpa_pmu->pmu, name, -1);
>> + if (ret) {
>> + dev_err(cpa_pmu->dev, "PMU register failed\n");
>> + cpuhp_state_remove_instance_nocalls(
>> + CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE, &cpa_pmu->node);
>> + return ret;
>> + }
>> +
>> + platform_set_drvdata(pdev, cpa_pmu);
>> + return ret;
>> +}
>> +
>> +static int hisi_cpa_pmu_remove(struct platform_device *pdev)
>> +{
>> + struct hisi_pmu *cpa_pmu = platform_get_drvdata(pdev);
>> +
>> + perf_pmu_unregister(&cpa_pmu->pmu);
>> +
>> cpuhp_state_remove_instance_nocalls(CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE,
>> + &cpa_pmu->node);
>> + hisi_cpa_pmu_enable_pm(cpa_pmu);
>> + return 0;
>> +}
>> +
>> +static struct platform_driver hisi_cpa_pmu_driver = {
>> + .driver = {
>> + .name = "hisi_cpa_pmu",
>> + .acpi_match_table = ACPI_PTR(hisi_cpa_pmu_acpi_match),
>> + .suppress_bind_attrs = true,
>> + },
>> + .probe = hisi_cpa_pmu_probe,
>> + .remove = hisi_cpa_pmu_remove,
>> +};
>> +
>> +static int __init hisi_cpa_pmu_module_init(void)
>> +{
>> + int ret;
>> +
>> + ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE,
>> + "AP_PERF_ARM_HISI_CPA_ONLINE",
>> + hisi_uncore_pmu_online_cpu,
>> + hisi_uncore_pmu_offline_cpu);
>> + if (ret) {
>> + pr_err("setup hotplug failed: %d\n", ret);
>> + return ret;
>> + }
>> +
>> + ret = platform_driver_register(&hisi_cpa_pmu_driver);
>> + if (ret)
>> + cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE);
>> +
>> + return ret;
>> +}
>> +module_init(hisi_cpa_pmu_module_init);
>> +
>> +static void __exit hisi_cpa_pmu_module_exit(void)
>> +{
>> + platform_driver_unregister(&hisi_cpa_pmu_driver);
>> + cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE);
>> +}
>> +module_exit(hisi_cpa_pmu_module_exit);
>> +
>> +MODULE_DESCRIPTION("HiSilicon SoC CPA uncore PMU driver");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_AUTHOR("Qi Liu <liuqi115 at huawei.com>");
>> diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
>> index 411a428ace4d..d55063719904 100644
>> --- a/include/linux/cpuhotplug.h
>> +++ b/include/linux/cpuhotplug.h
>> @@ -220,6 +220,7 @@ enum cpuhp_state {
>> CPUHP_AP_PERF_S390_SF_ONLINE,
>> CPUHP_AP_PERF_ARM_CCI_ONLINE,
>> CPUHP_AP_PERF_ARM_CCN_ONLINE,
>> + CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE,
>> CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
>> CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE,
>> CPUHP_AP_PERF_ARM_HISI_L3_ONLINE,
>
> .
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