linux-kernel - Re: [PATCH v2 1/1] dmaengine: idxd: Add IDXD performance monitor support

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Message-ID: <YH623ULPRbdi1ker@vkoul-mobl.Dlink>
Date:   Tue, 20 Apr 2021 16:41:25 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Tom Zanussi <tom.zanussi@...ux.intel.com>
Cc:     peterz@...radead.org, acme@...nel.org, mingo@...nel.org,
        kan.liang@...ux.intel.com, dave.jiang@...el.com,
        tony.luck@...el.com, dan.j.williams@...el.com,
        linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: Re: [PATCH v2 1/1] dmaengine: idxd: Add IDXD performance monitor
 support

On 03-04-21, 11:45, Tom Zanussi wrote:

> +config INTEL_IDXD_PERFMON
> +	bool "Intel Data Accelerators performance monitor support"
> +	depends on INTEL_IDXD
> +	default y

default y..?

>  /* IDXD software descriptor */
> @@ -369,4 +399,19 @@ int idxd_cdev_get_major(struct idxd_device *idxd);
>  int idxd_wq_add_cdev(struct idxd_wq *wq);
>  void idxd_wq_del_cdev(struct idxd_wq *wq);
>  
> +/* perfmon */
> +#ifdef CONFIG_INTEL_IDXD_PERFMON

maybe use IS_ENABLED()

> @@ -556,6 +562,8 @@ static int __init idxd_init_module(void)
>  	for (i = 0; i < IDXD_TYPE_MAX; i++)
>  		idr_init(&idxd_idrs[i]);
>  
> +	perfmon_init();
> +
>  	err = idxd_register_bus_type();
>  	if (err < 0)
>  		return err;
> @@ -589,5 +597,6 @@ static void __exit idxd_exit_module(void)
>  	pci_unregister_driver(&idxd_pci_driver);
>  	idxd_cdev_remove();
>  	idxd_unregister_bus_type();
> +	perfmon_exit();

Ideally would make sense to add perfmon module first and then add use in
idxd..

> +static ssize_t cpumask_show(struct device *dev, struct device_attribute *attr,
> +			    char *buf);
> +
> +static cpumask_t		perfmon_dsa_cpu_mask;
> +static bool			cpuhp_set_up;
> +static enum cpuhp_state		cpuhp_slot;
> +
> +static DEVICE_ATTR_RO(cpumask);

Pls document these new attributes added

> +static int perfmon_collect_events(struct idxd_pmu *idxd_pmu,
> +				  struct perf_event *leader,
> +				  bool dogrp)

dogrp..?

> +static int perfmon_validate_group(struct idxd_pmu *pmu,
> +				  struct perf_event *event)
> +{
> +	struct perf_event *leader = event->group_leader;
> +	struct idxd_pmu *fake_pmu;
> +	int i, ret = 0, n;
> +
> +	fake_pmu = kzalloc(sizeof(*fake_pmu), GFP_KERNEL);
> +	if (!fake_pmu)
> +		return -ENOMEM;
> +
> +	fake_pmu->pmu.name = pmu->pmu.name;
> +	fake_pmu->n_counters = pmu->n_counters;
> +
> +	n = perfmon_collect_events(fake_pmu, leader, true);
> +	if (n < 0) {
> +		ret = n;
> +		goto out;
> +	}
> +
> +	fake_pmu->n_events = n;
> +	n = perfmon_collect_events(fake_pmu, event, false);
> +	if (n < 0) {
> +		ret = n;
> +		goto out;
> +	}
> +
> +	fake_pmu->n_events = n;
> +
> +	for (i = 0; i < n; i++) {
> +		int idx;

lets move it to top of the function please

> +static inline u64 perfmon_pmu_read_counter(struct perf_event *event)
> +{
> +	struct hw_perf_event *hwc = &event->hw;
> +	struct idxd_device *idxd;
> +	int cntr = hwc->idx;
> +	u64 cntrdata;
> +
> +	idxd = event_to_idxd(event);
> +
> +	cntrdata = ioread64(CNTRDATA_REG(idxd, cntr));
> +
> +	return cntrdata;

return ioread64() ?
-- 
~Vinod