linux-kernel - Re: [PATCH v6 2/7] perf: imx_perf: add macro definitions for parsing config attr

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Message-ID: <ZenudMDnq9bGzKbI@lizhi-Precision-Tower-5810>
Date: Thu, 7 Mar 2024 11:42:28 -0500
From: Frank Li <Frank.li@....com>
To: Xu Yang <xu.yang_2@....com>
Cc: will@...nel.org, mark.rutland@....com, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
	festevam@...il.com, john.g.garry@...cle.com, jolsa@...nel.org,
	namhyung@...nel.org, irogers@...gle.com, mike.leach@...aro.org,
	peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
	alexander.shishkin@...ux.intel.com, adrian.hunter@...el.com,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	imx@...ts.linux.dev
Subject: Re: [PATCH v6 2/7] perf: imx_perf: add macro definitions for parsing
 config attr

On Thu, Mar 07, 2024 at 05:57:25PM +0800, Xu Yang wrote:
> The user can set event and counter in cmdline and the driver need to parse
> it using 'config' attr value. This will add macro definitions to avoid
> hard-code in driver.
> 
> Signed-off-by: Xu Yang <xu.yang_2@....com>
> 
> ---
> Changes in v4:
>  - new patch
> Changes in v5:
>  - move this patch earlier
> Changes in v6:
>  - no changes
> ---
>  drivers/perf/fsl_imx9_ddr_perf.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/perf/fsl_imx9_ddr_perf.c b/drivers/perf/fsl_imx9_ddr_perf.c
> index 9685645bfe04..d1c566e661d8 100644
> --- a/drivers/perf/fsl_imx9_ddr_perf.c
> +++ b/drivers/perf/fsl_imx9_ddr_perf.c
> @@ -42,6 +42,11 @@
>  #define NUM_COUNTERS		11
>  #define CYCLES_COUNTER		0
>  
> +#define CONFIG_EVENT_MASK	0x00FF
> +#define CONFIG_EVENT_OFFSET	0

Needn't need OFFSET if use FIELD_*

> +#define CONFIG_COUNTER_MASK	0xFF00
> +#define CONFIG_COUNTER_OFFSET	8

The same

> +
>  #define to_ddr_pmu(p)		container_of(p, struct ddr_pmu, pmu)
>  
>  #define DDR_PERF_DEV_NAME	"imx9_ddr"
> @@ -339,8 +344,10 @@ static void ddr_perf_counter_local_config(struct ddr_pmu *pmu, int config,
>  				    int counter, bool enable)
>  {
>  	u32 ctrl_a;
> +	int event;
>  
>  	ctrl_a = readl_relaxed(pmu->base + PMLCA(counter));
> +	event = (config & CONFIG_EVENT_MASK) >> CONFIG_EVENT_OFFSET;

FIELD_GET(CONFIG_EVENT_MASK, config);

same below all code about config.

>  
>  	if (enable) {
>  		ctrl_a |= PMLCA_FC;
> @@ -352,7 +359,7 @@ static void ddr_perf_counter_local_config(struct ddr_pmu *pmu, int config,
>  		ctrl_a &= ~PMLCA_FC;
>  		ctrl_a |= PMLCA_CE;
>  		ctrl_a &= ~FIELD_PREP(PMLCA_EVENT, 0x7F);
> -		ctrl_a |= FIELD_PREP(PMLCA_EVENT, (config & 0x000000FF));
> +		ctrl_a |= FIELD_PREP(PMLCA_EVENT, event);
>  		writel(ctrl_a, pmu->base + PMLCA(counter));
>  	} else {
>  		/* Freeze counter. */
> @@ -366,8 +373,8 @@ static void ddr_perf_monitor_config(struct ddr_pmu *pmu, int cfg, int cfg1, int
>  	u32 pmcfg1, pmcfg2;
>  	int event, counter;
>  
> -	event = cfg & 0x000000FF;
> -	counter = (cfg & 0x0000FF00) >> 8;
> +	event = (cfg & CONFIG_EVENT_MASK) >> CONFIG_EVENT_OFFSET;
> +	counter = (cfg & CONFIG_COUNTER_MASK) >> CONFIG_COUNTER_OFFSET;
>  
>  	pmcfg1 = readl_relaxed(pmu->base + PMCFG1);
>  
> @@ -469,7 +476,7 @@ static int ddr_perf_event_add(struct perf_event *event, int flags)
>  	int cfg2 = event->attr.config2;
>  	int counter;
>  
> -	counter = (cfg & 0x0000FF00) >> 8;
> +	counter = (cfg & CONFIG_COUNTER_MASK) >> CONFIG_COUNTER_OFFSET;
>  
>  	pmu->events[counter] = event;
>  	pmu->active_events++;
> -- 
> 2.34.1
>