linux-kernel - Re: [PATCH 1/2] dmaengine: idxd: reformat swerror output to standard Linux bitmap output

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Message-ID: <Y8ff1R7O0uKTFN15@matsya>
Date:   Wed, 18 Jan 2023 17:32:29 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Fenghua Yu <fenghua.yu@...el.com>
Cc:     Dave Jiang <dave.jiang@...el.com>, dmaengine@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] dmaengine: idxd: reformat swerror output to standard
 Linux bitmap output

On 03-01-23, 08:53, Fenghua Yu wrote:
> From: Dave Jiang <dave.jiang@...el.com>
> 
> SWERROR register is 4 64bit wide registers. Currently the sysfs attribute
> just outputs 4 64bit hex integers. Covert to output with %*pb format

s/Covert/Convert

> specifier.
> 
> Signed-off-by: Dave Jiang <dave.jiang@...el.com>
> Co-developed-by: Fenghua Yu <fenghua.yu@...el.com>
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> ---
>  drivers/dma/idxd/idxd.h  |  1 +
>  drivers/dma/idxd/init.c  |  2 +-
>  drivers/dma/idxd/sysfs.c | 10 ++++------
>  3 files changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
> index f92f8ec83722..e449d905bea3 100644
> --- a/drivers/dma/idxd/idxd.h
> +++ b/drivers/dma/idxd/idxd.h
> @@ -654,6 +654,7 @@ int idxd_register_driver(void);
>  void idxd_unregister_driver(void);
>  void idxd_wqs_quiesce(struct idxd_device *idxd);
>  bool idxd_queue_int_handle_resubmit(struct idxd_desc *desc);
> +void multi_u64_to_bmap(unsigned long *bmap, u64 *val, int count);

This change does not belong to this patch, I dont know why this is here

>  
>  /* device interrupt control */
>  irqreturn_t idxd_misc_thread(int vec, void *data);
> diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
> index 564c025b9b7e..996bd3e4e50f 100644
> --- a/drivers/dma/idxd/init.c
> +++ b/drivers/dma/idxd/init.c
> @@ -425,7 +425,7 @@ static void idxd_read_table_offsets(struct idxd_device *idxd)
>  	dev_dbg(dev, "IDXD Perfmon Offset: %#x\n", idxd->perfmon_offset);
>  }
>  
> -static void multi_u64_to_bmap(unsigned long *bmap, u64 *val, int count)
> +void multi_u64_to_bmap(unsigned long *bmap, u64 *val, int count)
>  {
>  	int i, j, nr;
>  
> diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
> index c772172d4ceb..dae28509e6ed 100644
> --- a/drivers/dma/idxd/sysfs.c
> +++ b/drivers/dma/idxd/sysfs.c
> @@ -1506,15 +1506,13 @@ static ssize_t errors_show(struct device *dev,
>  			   struct device_attribute *attr, char *buf)
>  {
>  	struct idxd_device *idxd = confdev_to_idxd(dev);
> -	int i, out = 0;
> +	DECLARE_BITMAP(swerr_bmap, 256);
>  
> +	bitmap_zero(swerr_bmap, 256);
>  	spin_lock(&idxd->dev_lock);
> -	for (i = 0; i < 4; i++)
> -		out += sysfs_emit_at(buf, out, "%#018llx ", idxd->sw_err.bits[i]);
> +	multi_u64_to_bmap(swerr_bmap, &idxd->sw_err.bits[0], 4);
>  	spin_unlock(&idxd->dev_lock);
> -	out--;
> -	out += sysfs_emit_at(buf, out, "\n");
> -	return out;
> +	return sysfs_emit(buf, "%*pb\n", 256, swerr_bmap);
>  }
>  static DEVICE_ATTR_RO(errors);
>  
> -- 
> 2.32.0

-- 
~Vinod