[PATCH 01/10] drm/print: make drm_err_printer() device specific by using drm_err()

[Luca Coelho]

On Tue, 2024-01-16 at 15:07 +0200, Jani Nikula wrote:
> With few users for drm_err_printer(), it's still feasible to convert it
> to be device specific. Use drm_err() under the hood.
> 
> While at it, make the prefix optional.
> 
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
> ---
>  drivers/gpu/drm/drm_print.c                         |  7 ++++++-
>  drivers/gpu/drm/i915/gt/selftest_engine_heartbeat.c |  4 ++--
>  drivers/gpu/drm/i915/selftests/i915_active.c        |  4 ++--
>  include/drm/drm_print.h                             | 11 ++++++++---
>  4 files changed, 18 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
> index 5b93c11895bb..91dbcdeaad3f 100644
> --- a/drivers/gpu/drm/drm_print.c
> +++ b/drivers/gpu/drm/drm_print.c
> @@ -191,7 +191,12 @@ EXPORT_SYMBOL(__drm_printfn_debug);
>  
>  void __drm_printfn_err(struct drm_printer *p, struct va_format *vaf)
>  {
> -	pr_err("*ERROR* %s %pV", p->prefix, vaf);
> +	struct drm_device *drm = p->arg;
> +
> +	if (p->prefix)
> +		drm_err(drm, "%s %pV", p->prefix, vaf);
> +	else
> +		drm_err(drm, "%pV", vaf);
>  }
>  EXPORT_SYMBOL(__drm_printfn_err);
>  
> diff --git a/drivers/gpu/drm/i915/gt/selftest_engine_heartbeat.c b/drivers/gpu/drm/i915/gt/selftest_engine_heartbeat.c
> index bc441ce7b380..be827318275c 100644
> --- a/drivers/gpu/drm/i915/gt/selftest_engine_heartbeat.c
> +++ b/drivers/gpu/drm/i915/gt/selftest_engine_heartbeat.c
> @@ -122,7 +122,7 @@ static int __live_idle_pulse(struct intel_engine_cs *engine,
>  	GEM_BUG_ON(!llist_empty(&engine->barrier_tasks));
>  
>  	if (engine_sync_barrier(engine)) {
> -		struct drm_printer m = drm_err_printer("pulse");
> +		struct drm_printer m = drm_err_printer(&engine->i915->drm, "pulse");
>  
>  		pr_err("%s: no heartbeat pulse?\n", engine->name);
>  		intel_engine_dump(engine, &m, "%s", engine->name);
> @@ -136,7 +136,7 @@ static int __live_idle_pulse(struct intel_engine_cs *engine,
>  	pulse_unlock_wait(p); /* synchronize with the retirement callback */
>  
>  	if (!i915_active_is_idle(&p->active)) {
> -		struct drm_printer m = drm_err_printer("pulse");
> +		struct drm_printer m = drm_err_printer(&engine->i915->drm, "pulse");
>  
>  		pr_err("%s: heartbeat pulse did not flush idle tasks\n",
>  		       engine->name);
> diff --git a/drivers/gpu/drm/i915/selftests/i915_active.c b/drivers/gpu/drm/i915/selftests/i915_active.c
> index b61fe850e924..8886752ade63 100644
> --- a/drivers/gpu/drm/i915/selftests/i915_active.c
> +++ b/drivers/gpu/drm/i915/selftests/i915_active.c
> @@ -156,7 +156,7 @@ static int live_active_wait(void *arg)
>  
>  	__i915_active_wait(&active->base, TASK_UNINTERRUPTIBLE);
>  	if (!READ_ONCE(active->retired)) {
> -		struct drm_printer p = drm_err_printer(__func__);
> +		struct drm_printer p = drm_err_printer(&i915->drm, __func__);
>  
>  		pr_err("i915_active not retired after waiting!\n");
>  		i915_active_print(&active->base, &p);
> @@ -189,7 +189,7 @@ static int live_active_retire(void *arg)
>  		err = -EIO;
>  
>  	if (!READ_ONCE(active->retired)) {
> -		struct drm_printer p = drm_err_printer(__func__);
> +		struct drm_printer p = drm_err_printer(&i915->drm, __func__);
>  
>  		pr_err("i915_active not retired after flushing!\n");
>  		i915_active_print(&active->base, &p);
> diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
> index 5ed26a702e3e..1040213d02a4 100644
> --- a/include/drm/drm_print.h
> +++ b/include/drm/drm_print.h
> @@ -35,6 +35,8 @@
>  
>  #include <drm/drm.h>
>  
> +struct drm_device;
> +
>  /* Do *not* use outside of drm_print.[ch]! */
>  extern unsigned long __drm_debug;
>  
> @@ -235,16 +237,19 @@ static inline struct drm_printer drm_debug_printer(const char *prefix)
>  }
>  
>  /**
> - * drm_err_printer - construct a &drm_printer that outputs to pr_err()
> - * @prefix: debug output prefix
> + * drm_err_printer - construct a &drm_printer that outputs to drm_err()
> + * @drm: the &struct drm_device pointer
> + * @prefix: debug output prefix, or NULL for no prefix
>   *
>   * RETURNS:
>   * The &drm_printer object
>   */
> -static inline struct drm_printer drm_err_printer(const char *prefix)
> +static inline struct drm_printer drm_err_printer(struct drm_device *drm,
> +						 const char *prefix)
>  {
>  	struct drm_printer p = {
>  		.printfn = __drm_printfn_err,
> +		.arg = drm,
>  		.prefix = prefix
>  	};
>  	return p;

Reviewed-by: Luca Coelho <luciano.coelho at intel.com>

--
Cheers,
Luca.