[PATCH] drm: Print pid in drm log

[Daniel Vetter]

On Fri, Dec 18, 2015 at 05:11:45PM -0500, Harry Wentland wrote:
> From: Andrey Grodzovsky <Andrey.Grodzovsky at amd.com>
> 
> Add task ids to all DRM prints so it is easier to resolve
> concurency issues and understand the logic.
> 
> Signed-off-by: Andrey Grodzovsky <Andrey.Grodzovsky at amd.com>

Not sure pid is all that useful, so next patch will add comm and then
more. I think it'd be better to instead have a Kconfig option to convert
drm debug noise over to dynamic printk subsystem, iirc that has tons of
features and hopefully should cover this. If it's doesn't then
trace_printk will give you very nice profiles (again with a compile
option).

Cheers, Daniel

> ---
>  drivers/gpu/drm/drm_drv.c | 16 +++++++++++++---
>  include/drm/drmP.h        |  6 ++++--
>  2 files changed, 17 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 7dd6728dd092..7b17a9ae0b07 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -55,6 +55,16 @@ static struct idr drm_minors_idr;
>  
>  static struct dentry *drm_debugfs_root;
>  
> +pid_t get_my_pid(void) {
> +
> +	if (!in_interrupt())
> +		return current->pid;
> +
> +	return 0;
> +}
> +
> +EXPORT_SYMBOL(get_my_pid);
> +
>  void drm_err(const char *format, ...)
>  {
>  	struct va_format vaf;
> @@ -65,8 +75,8 @@ void drm_err(const char *format, ...)
>  	vaf.fmt = format;
>  	vaf.va = &args;
>  
> -	printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV",
> -	       __builtin_return_address(0), &vaf);
> +	printk(KERN_ERR "[%u][" DRM_NAME ":%ps] *ERROR* %pV",
> +			get_my_pid(),__builtin_return_address(0), &vaf);
>  
>  	va_end(args);
>  }
> @@ -81,7 +91,7 @@ void drm_ut_debug_printk(const char *function_name, const char *format, ...)
>  	vaf.fmt = format;
>  	vaf.va = &args;
>  
> -	printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf);
> +	printk(KERN_DEBUG "[%u][" DRM_NAME ":%s] %pV",get_my_pid(), function_name, &vaf);
>  
>  	va_end(args);
>  }
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 5531d7bbe851..4b17f890ca14 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -183,11 +183,13 @@ void drm_err(const char *format, ...);
>  		drm_err(fmt, ##__VA_ARGS__);				\
>  })
>  
> +pid_t get_my_pid(void);
> +
>  #define DRM_INFO(fmt, ...)				\
> -	printk(KERN_INFO "[" DRM_NAME "] " fmt, ##__VA_ARGS__)
> +	printk(KERN_INFO "[%u][" DRM_NAME "] " fmt,get_my_pid(), ##__VA_ARGS__)
>  
>  #define DRM_INFO_ONCE(fmt, ...)				\
> -	printk_once(KERN_INFO "[" DRM_NAME "] " fmt, ##__VA_ARGS__)
> +	printk_once(KERN_INFO "[%u][" DRM_NAME "] " fmt,get_my_pid(), ##__VA_ARGS__)
>  
>  /**
>   * Debug output.
> -- 
> 2.1.4
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch