linux-kernel - Re: [PATCH v5 5/7] fpga: dfl: fme: add interrupt support for global error reporting

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Message-ID: <20200525193250.GE22266@fuller.cnet>
Date:   Mon, 25 May 2020 16:32:50 -0300
From:   Marcelo Tosatti <mtosatti@...hat.com>
To:     Xu Yilun <yilun.xu@...el.com>
Cc:     mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, trix@...hat.com, bhu@...hat.com,
        Luwei Kang <luwei.kang@...el.com>, Wu Hao <hao.wu@...el.com>
Subject: Re: [PATCH v5 5/7] fpga: dfl: fme: add interrupt support for global
 error reporting

On Mon, Apr 20, 2020 at 04:11:41PM +0800, Xu Yilun wrote:
> Error reporting interrupt is very useful to notify users that some
> errors are detected by the hardware. Once users are notified, they
> could query hardware logged error states, no need to continuously
> poll on these states.
> 
> This patch adds interrupt support for fme global error reporting sub
> feature. It follows the common DFL interrupt notification and handling
> mechanism. And it implements two ioctls below for user to query
> number of irqs supported, and set/unset interrupt triggers.
> 
>  Ioctls:
>  * DFL_FPGA_FME_ERR_GET_IRQ_NUM
>    get the number of irqs, which is used to determine whether/how many
>    interrupts fme error reporting feature supports.
> 
>  * DFL_FPGA_FME_ERR_SET_IRQ
>    set/unset given eventfds as fme error reporting interrupt triggers.
> 
> Signed-off-by: Luwei Kang <luwei.kang@...el.com>
> Signed-off-by: Wu Hao <hao.wu@...el.com>
> Signed-off-by: Xu Yilun <yilun.xu@...el.com>
> Acked-by: Wu Hao <hao.wu@...el.com>
> ----
> v2: use DFL_FPGA_FME_ERR_GET_IRQ_NUM instead of
>     DFL_FPGA_FME_ERR_GET_INFO
>     Delete flags field for DFL_FPGA_FME_ERR_SET_IRQ
> v3: put_user() instead of copy_to_user()
>     improves comments
> v4: use common functions to handle irq ioctls
> v5: Minor fixes for Hao's comments
> ---
>  drivers/fpga/dfl-fme-error.c  | 18 ++++++++++++++++++
>  drivers/fpga/dfl-fme-main.c   |  6 ++++++
>  include/uapi/linux/fpga-dfl.h | 23 +++++++++++++++++++++++
>  3 files changed, 47 insertions(+)
> 
> diff --git a/drivers/fpga/dfl-fme-error.c b/drivers/fpga/dfl-fme-error.c
> index f897d41..51c2892 100644
> --- a/drivers/fpga/dfl-fme-error.c
> +++ b/drivers/fpga/dfl-fme-error.c
> @@ -15,6 +15,7 @@
>   *   Mitchel, Henry <henry.mitchel@...el.com>
>   */
>  
> +#include <linux/fpga-dfl.h>
>  #include <linux/uaccess.h>
>  
>  #include "dfl.h"
> @@ -348,6 +349,22 @@ static void fme_global_err_uinit(struct platform_device *pdev,
>  	fme_err_mask(&pdev->dev, true);
>  }
>  
> +static long
> +fme_global_error_ioctl(struct platform_device *pdev,
> +		       struct dfl_feature *feature,
> +		       unsigned int cmd, unsigned long arg)
> +{
> +	switch (cmd) {
> +	case DFL_FPGA_FME_ERR_GET_IRQ_NUM:
> +		return dfl_feature_ioctl_get_num_irqs(pdev, feature, arg);
> +	case DFL_FPGA_FME_ERR_SET_IRQ:
> +		return dfl_feature_ioctl_set_irq(pdev, feature, arg);
> +	default:
> +		dev_dbg(&pdev->dev, "%x cmd not handled", cmd);
> +		return -ENODEV;
> +	}
> +}
> +
>  const struct dfl_feature_id fme_global_err_id_table[] = {
>  	{.id = FME_FEATURE_ID_GLOBAL_ERR,},
>  	{0,}
> @@ -356,4 +373,5 @@ const struct dfl_feature_id fme_global_err_id_table[] = {
>  const struct dfl_feature_ops fme_global_err_ops = {
>  	.init = fme_global_err_init,
>  	.uinit = fme_global_err_uinit,
> +	.ioctl = fme_global_error_ioctl,
>  };
> diff --git a/drivers/fpga/dfl-fme-main.c b/drivers/fpga/dfl-fme-main.c
> index 56d720c..ab3722d 100644
> --- a/drivers/fpga/dfl-fme-main.c
> +++ b/drivers/fpga/dfl-fme-main.c
> @@ -616,11 +616,17 @@ static int fme_release(struct inode *inode, struct file *filp)
>  {
>  	struct dfl_feature_platform_data *pdata = filp->private_data;
>  	struct platform_device *pdev = pdata->dev;
> +	struct dfl_feature *feature;
>  
>  	dev_dbg(&pdev->dev, "Device File Release\n");
>  
>  	mutex_lock(&pdata->lock);
>  	dfl_feature_dev_use_end(pdata);
> +
> +	if (!dfl_feature_dev_use_count(pdata))
> +		dfl_fpga_dev_for_each_feature(pdata, feature)
> +			dfl_fpga_set_irq_triggers(feature, 0,
> +						  feature->nr_irqs, NULL);
>  	mutex_unlock(&pdata->lock);
>  
>  	return 0;
> diff --git a/include/uapi/linux/fpga-dfl.h b/include/uapi/linux/fpga-dfl.h
> index 6c71c9d..b6495ea 100644
> --- a/include/uapi/linux/fpga-dfl.h
> +++ b/include/uapi/linux/fpga-dfl.h
> @@ -230,4 +230,27 @@ struct dfl_fpga_fme_port_pr {
>   */
>  #define DFL_FPGA_FME_PORT_ASSIGN     _IOW(DFL_FPGA_MAGIC, DFL_FME_BASE + 2, int)
>  
> +/**
> + * DFL_FPGA_FME_ERR_GET_IRQ_NUM - _IOR(DFL_FPGA_MAGIC, DFL_FME_BASE + 3,
> + *							__u32 num_irqs)
> + *
> + * Get the number of irqs supported by the fpga fme error reporting private
> + * feature. Currently hardware supports up to 1 irq.
> + * Return: 0 on success, -errno on failure.
> + */
> +#define DFL_FPGA_FME_ERR_GET_IRQ_NUM	_IOR(DFL_FPGA_MAGIC,	\
> +					     DFL_FME_BASE + 3, __u32)
> +
> +/**
> + * DFL_FPGA_FME_ERR_SET_IRQ - _IOW(DFL_FPGA_MAGIC, DFL_FME_BASE + 4,
> + *						struct dfl_fpga_irq_set)
> + *
> + * Set fpga fme error reporting interrupt trigger if evtfds[n] is valid.
> + * Unset related interrupt trigger if evtfds[n] is a negative value.
> + * Return: 0 on success, -errno on failure.
> + */
> +#define DFL_FPGA_FME_ERR_SET_IRQ	_IOW(DFL_FPGA_MAGIC,	\
> +					     DFL_FME_BASE + 4,	\
> +					     struct dfl_fpga_irq_set)
> +
>  #endif /* _UAPI_LINUX_FPGA_DFL_H */
> -- 
> 2.7.4

Reviewed-by: Marcelo Tosatti <mtosatti@...hat.com>