linux-kernel - Re: [PATCH 1/7] drm: Add a helper function for printing a debugfs_regset32.

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Message-ID: <20190221093757.GL2665@phenom.ffwll.local>
Date:   Thu, 21 Feb 2019 10:37:57 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] drm: Add a helper function for printing a
 debugfs_regset32.

On Wed, Feb 20, 2019 at 01:03:37PM -0800, Eric Anholt wrote:
> The debugfs_regset32 is nice to use for reducing boilerplate in
> dumping a bunch of regs in debugfs, but we also want to be able to
> print to dmesg them at runtime for driver debugging.  drm_printer lets
> us format debugfs and the printk the same way.
> 
> Signed-off-by: Eric Anholt <eric@...olt.net>
> ---
>  drivers/gpu/drm/drm_print.c | 16 ++++++++++++++++
>  include/drm/drm_print.h     |  2 ++
>  2 files changed, 18 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
> index 0e7fc3e7dfb4..5ecc0f04cd0c 100644
> --- a/drivers/gpu/drm/drm_print.c
> +++ b/drivers/gpu/drm/drm_print.c
> @@ -253,3 +253,19 @@ void drm_err(const char *format, ...)
>  	va_end(args);
>  }
>  EXPORT_SYMBOL(drm_err);
> +

A bit of kerneldoc would be nice. With that:

Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>

> +void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset)
> +{
> +	int namelen = 0;
> +	int i;
> +
> +	for (i = 0; i < regset->nregs; i++)
> +		namelen = max(namelen, (int)strlen(regset->regs[i].name));
> +
> +	for (i = 0; i < regset->nregs; i++) {
> +		drm_printf(p, "%*s = 0x%08x\n",
> +			   namelen, regset->regs[i].name,
> +			   readl(regset->base + regset->regs[i].offset));
> +	}
> +}
> +EXPORT_SYMBOL(drm_print_regset32);
> diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
> index afbc3beef089..3a4247319e63 100644
> --- a/include/drm/drm_print.h
> +++ b/include/drm/drm_print.h
> @@ -30,6 +30,7 @@
>  #include <linux/printk.h>
>  #include <linux/seq_file.h>
>  #include <linux/device.h>
> +#include <linux/debugfs.h>
>  
>  /**
>   * DOC: print
> @@ -84,6 +85,7 @@ void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf);
>  __printf(2, 3)
>  void drm_printf(struct drm_printer *p, const char *f, ...);
>  void drm_puts(struct drm_printer *p, const char *str);
> +void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset);
>  
>  __printf(2, 0)
>  /**
> -- 
> 2.20.1
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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