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Message-ID: <c189bc40-b73c-5653-2717-0dabdd4ec964@huawei.com>
Date: Wed, 6 Apr 2022 09:57:48 +0800
From: "liuqi (BA)" <liuqi115@...wei.com>
To: John Garry <john.garry@...wei.com>,
"will@...nel.org" <will@...nel.org>,
"mark.rutland@....com" <mark.rutland@....com>
CC: Zhangshaokun <zhangshaokun@...ilicon.com>,
Linuxarm <linuxarm@...wei.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] drivers/perf: hisi: Add Support for CPA PMU
Hi John,
Thanks for the comments. some replies inline.
On 2022/4/5 16:28, John Garry wrote:
> On 21/03/2022 07:01, Qi Liu wrote:
>> On HiSilicon Hip09 platform, there is a CPA(Coherency Protocol Agent) on
>
> leave whitespace before '('
>
ok, will fix this.
>> each SICL (Super I/O Cluster) which implements packet format translation,
>> route parsing and traffic statistic.
>
> statistics
will fix this, thanks.
>
>>
>> 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.
>>
>
> Generally this looks ok, just some small comments to consider.
>
> Thanks,
> John
>
>> Signed-off-by: Qi Liu <liuqi115@...wei.com>
>> ---
>> drivers/perf/hisilicon/Makefile | 2 +-
>> drivers/perf/hisilicon/hisi_uncore_cpa_pmu.c | 400 +++++++++++++++++++
>> include/linux/cpuhotplug.h | 1 +
>> 3 files changed, 402 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..3f1d9c3f99fe
>> --- /dev/null
>> +++ b/drivers/perf/hisilicon/hisi_uncore_cpa_pmu.c
>> @@ -0,0 +1,400 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * HiSilicon SoC CPA(Coherency Protocol Agent) uncore hardware event
>> counters support
>
> I am not sure why we even mention uncore for something which is not in a
> SCCL
>
we metion uncore as it use hisi_uncore_pmu framework, I'll drop this
next time.
>> + *
>> + * Copyright (C) 2022 HiSilicon Limited
>> + * Author: Qi Liu <liuqi115@...wei.com>
>> + *
>> + * This code is based on the uncore PMUs like arm-cci and arm-ccn.
>> + */
>> +
[...]
>> +
>> +static int hisi_cpa_pmu_init_data(struct platform_device *pdev,
>> + struct hisi_pmu *cpa_pmu)
>> +{
>> + if (device_property_read_u32(&pdev->dev, "hisilicon,scl-id",
>> + &cpa_pmu->sicl_id)) {
>> + dev_err(&pdev->dev, "Can not read cpa_pmu sicl-id\n");
>
> I don't think that you need to mention "cpa_pmu"
will drop it.
>
>> + return -EINVAL;
>> + }
>> +
>> + if (device_property_read_u32(&pdev->dev, "hisilicon,idx-id",
>> + &cpa_pmu->index_id)) {
>> + dev_err(&pdev->dev, "Cannot read idx-id\n");
>> + return -EINVAL;
>> + }
>> +
>> + cpa_pmu->ccl_id = -1;
>> + cpa_pmu->sccl_id = -1;
>> + cpa_pmu->base = devm_platform_ioremap_resource(pdev, 0);
>> + if (IS_ERR(cpa_pmu->base))
>> + return PTR_ERR(cpa_pmu->base);
>> +
>> + cpa_pmu->identifier = readl(cpa_pmu->base + CPA_VERSION);
>> +
>> + return 0;
>> +}
>> +
[...]
>> +
>> +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;
>> +
>> + ret = cpuhp_state_add_instance(CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE,
>> +
>> + 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);
>> +
>> + /* Power Management should be disabled before using CPA PMU. */
>> + hisi_cpa_pmu_disable_pm(cpa_pmu);
>
> maybe you can move this earlier in the probe, before registering
>
got it, will do this.
>> + return ret;
>> +}
>> +
>> +static int hisi_cpa_pmu_remove(struct platform_device *pdev)
>> +{
>> + struct hisi_pmu *cpa_pmu = platform_get_drvdata(pdev);
>> +
>> + hisi_cpa_pmu_enable_pm(cpa_pmu);
>
> why do we do this?
restore CPA registers after remove CPA PMU driver, as we disable pmu in
probe function.
>
>> + perf_pmu_unregister(&cpa_pmu->pmu);
>> +
>> cpuhp_state_remove_instance_nocalls(CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE,
>> + &cpa_pmu->node);
>> + 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("CPA PMU: setup hotplug: %d\n", ret);
>
> you don't mention failed
>
> And mostly we use lowercase for the driver name and maybe consider using
> pr_fmt
>
got it, will fix this next time.
Thanks,
Qi
>> + 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@...wei.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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