Date: Wed, 2 Nov 2016 22:40:09 +0800
From: Shawn Guo <shawnguo@kernel.org>
To: Frank Li <Frank.Li@nxp.com>
Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        peterz@infradead.org, mingo@redhat.com, acme@kernel.org,
        alexander.shishkin@linux.intel.com, lznuaa@gmail.com,
        mark.rutland@arm.com
Subject: Re: [PATCH 1/2] ARM: imx: mmdc perf function support i.MX6QP
Message-ID: <20161102144008.GC19126@dragon>
References: <1477430817-20381-1-git-send-email-Frank.Li@nxp.com>
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On Tue, Oct 25, 2016 at 04:26:56PM -0500, Frank Li wrote:
> i.MX6QP added new reigster bit PROFILE_SEL in MADPCR0.
> need set it at perf start.
> 
> Signed-off-by: Frank Li <Frank.Li@nxp.com>
> ---
>  arch/arm/mach-imx/mmdc.c | 45 +++++++++++++++++++++++++++++++++++++++------
>  1 file changed, 39 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm/mach-imx/mmdc.c b/arch/arm/mach-imx/mmdc.c
> index d82d14c..d833b87 100644
> --- a/arch/arm/mach-imx/mmdc.c
> +++ b/arch/arm/mach-imx/mmdc.c
> @@ -44,6 +44,7 @@
>  #define DBG_RST			0x2
>  #define PRF_FRZ			0x4
>  #define CYC_OVF			0x8
> +#define PROFILE_SEL		0x10
>  
>  #define MMDC_MADPCR0	0x410
>  #define MMDC_MADPSR0	0x418
> @@ -55,10 +56,36 @@
>  
>  #define MMDC_NUM_COUNTERS	6
>  
> +#define FSL_MMDC_QUIRK_PROFILE_SEL	0x1
> +
>  #define to_mmdc_pmu(p) container_of(p, struct mmdc_pmu, pmu)
>  
>  static int ddr_type;
>  
> +enum fsl_mmdc_devtype {
> +	FSL_MMDC_IMX6Q,
> +	FSL_MMDC_IMX6QP,
> +};
> +
> +struct fsl_mmdc_devtype_data {
> +	enum fsl_mmdc_devtype devtype;
> +	int driver_data;
> +};
> +
> +static struct fsl_mmdc_devtype_data imx6q_data = {
> +	.devtype = FSL_MMDC_IMX6Q,
> +};
> +
> +static struct fsl_mmdc_devtype_data imx6qp_data = {
> +	.driver_data = FSL_MMDC_QUIRK_PROFILE_SEL,
> +};
> +
> +static const struct of_device_id imx_mmdc_dt_ids[] = {
> +	{ .compatible = "fsl,imx6q-mmdc", .data = (void *)&imx6q_data},
> +	{ .compatible = "fsl,imx6qp-mmdc", .data = (void *)&imx6qp_data},
> +	{ /* sentinel */ }
> +};
> +
>  #ifdef CONFIG_PERF_EVENTS
>  
>  static DEFINE_IDA(mmdc_ida);
> @@ -83,6 +110,7 @@ struct mmdc_pmu {
>  	struct device *dev;
>  	struct perf_event *mmdc_events[MMDC_NUM_COUNTERS];
>  	struct hlist_node node;
> +	struct fsl_mmdc_devtype_data *devtype_data;
>  };
>  
>  /*
> @@ -307,6 +335,7 @@ static void mmdc_pmu_event_start(struct perf_event *event, int flags)
>  	struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
>  	struct hw_perf_event *hwc = &event->hw;
>  	void __iomem *mmdc_base, *reg;
> +	int val;
>  
>  	mmdc_base = pmu_mmdc->mmdc_base;
>  	reg = mmdc_base + MMDC_MADPCR0;
> @@ -321,7 +350,12 @@ static void mmdc_pmu_event_start(struct perf_event *event, int flags)
>  	local64_set(&hwc->prev_count, 0);
>  
>  	writel(DBG_RST, reg);
> -	writel(DBG_EN, reg);
> +
> +	val = DBG_EN;
> +	if (pmu_mmdc->devtype_data->driver_data & FSL_MMDC_QUIRK_PROFILE_SEL)

Shouldn't it be good enough to have the flag telling different
programming model between variants?  That said, I do not see the point
of introducing enum fsl_mmdc_devtype.

Shawn

> +		val |= PROFILE_SEL;
> +
> +	writel(val, reg);
>  }
>  
>  static int mmdc_pmu_event_add(struct perf_event *event, int flags)
> @@ -436,6 +470,8 @@ static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_b
>  	char *name;
>  	int mmdc_num;
>  	int ret;
> +	const struct of_device_id *of_id =
> +		of_match_device(imx_mmdc_dt_ids, &pdev->dev);
>  
>  	pmu_mmdc = kzalloc(sizeof(*pmu_mmdc), GFP_KERNEL);
>  	if (!pmu_mmdc) {
> @@ -450,6 +486,8 @@ static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_b
>  		name = devm_kasprintf(&pdev->dev,
>  				GFP_KERNEL, "mmdc%d", mmdc_num);
>  
> +	pmu_mmdc->devtype_data = (struct fsl_mmdc_devtype_data *)of_id->data;
> +
>  	hrtimer_init(&pmu_mmdc->hrtimer, CLOCK_MONOTONIC,
>  			HRTIMER_MODE_REL);
>  	pmu_mmdc->hrtimer.function = mmdc_pmu_timer_handler;
> @@ -524,11 +562,6 @@ int imx_mmdc_get_ddr_type(void)
>  	return ddr_type;
>  }
>  
> -static const struct of_device_id imx_mmdc_dt_ids[] = {
> -	{ .compatible = "fsl,imx6q-mmdc", },
> -	{ /* sentinel */ }
> -};
> -
>  static struct platform_driver imx_mmdc_driver = {
>  	.driver		= {
>  		.name	= "imx-mmdc",
> -- 
> 2.5.2
>