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Message-ID: <7d19a626299fcc23e10678faea95b76d71c26b23.camel@redhat.com>
Date: Fri, 24 Sep 2021 14:16:42 -0400
From: Lyude Paul <lyude@...hat.com>
To: Thomas Zimmermann <tzimmermann@...e.de>,
Douglas Anderson <dianders@...omium.org>,
dri-devel@...ts.freedesktop.org
Cc: sam@...nborg.org, daniel.vetter@...ll.ch, jani.nikula@...el.com,
swboyd@...omium.org, airlied@...hat.com,
Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...ux.ie>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] drm/print: Add deprecation notes to DRM_...()
functions
Acked-by: Lyude Paul <lyude@...hat.com>
On Wed, 2021-09-22 at 09:12 +0200, Thomas Zimmermann wrote:
> Hi
>
> Am 21.09.21 um 17:28 schrieb Douglas Anderson:
> > It's hard for someone (like me) who's not following closely to know
> > what the suggested best practices are for error printing in DRM
> > drivers. Add some hints to the header file.
> >
> > In general, my understanding is that:
> > * When possible we should be using a `struct drm_device` for logging
> > and recent patches have tried to make it more possible to access a
> > relevant `struct drm_device` in more places.
> > * For most cases when we don't have a `struct drm_device`, we no
> > longer bother with DRM-specific wrappers on the dev_...() functions
> > or pr_...() functions and just encourage drivers to use the normal
> > functions.
> > * For debug-level functions where we might want filtering based on a
> > category we'll still have DRM-specific wrappers, but we'll only
> > support passing a `struct drm_device`, not a `struct
> > device`. Presumably most of the cases where we want the filtering
> > are messages that happen while the system is in a normal running
> > state (AKA not during probe time) and we should have a `struct
> > drm_device` then. If we absolutely can't get a `struct drm_device`
> > then these functions begrudgingly accept NULL for the `struct
> > drm_device` and hopefully the awkwardness of having to manually pass
> > NULL will keep people from doing this unless absolutely necessary.
> >
> > Signed-off-by: Douglas Anderson <dianders@...omium.org>
>
> Acked-by: Thomas Zimmermann <tzimmermann@...e.de>
>
> Thanks a lot.
>
> > ---
> >
> > include/drm/drm_print.h | 30 ++++++++++++++++++++++++++++++
> > 1 file changed, 30 insertions(+)
> >
> > diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
> > index 15a089a87c22..22fabdeed297 100644
> > --- a/include/drm/drm_print.h
> > +++ b/include/drm/drm_print.h
> > @@ -340,6 +340,8 @@ void drm_dev_dbg(const struct device *dev, enum
> > drm_debug_category category,
> > /**
> > * DRM_DEV_ERROR() - Error output.
> > *
> > + * NOTE: this is deprecated in favor of drm_err() or dev_err().
> > + *
> > * @dev: device pointer
> > * @fmt: printf() like format string.
> > */
> > @@ -349,6 +351,9 @@ void drm_dev_dbg(const struct device *dev, enum
> > drm_debug_category category,
> > /**
> > * DRM_DEV_ERROR_RATELIMITED() - Rate limited error output.
> > *
> > + * NOTE: this is deprecated in favor of drm_err_ratelimited() or
> > + * dev_err_ratelimited().
> > + *
> > * @dev: device pointer
> > * @fmt: printf() like format string.
> > *
> > @@ -364,9 +369,11 @@ void drm_dev_dbg(const struct device *dev, enum
> > drm_debug_category category,
> > DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__); \
> > })
> >
> > +/* NOTE: this is deprecated in favor of drm_info() or dev_info(). */
> > #define DRM_DEV_INFO(dev, fmt, ...) \
> > drm_dev_printk(dev, KERN_INFO, fmt, ##__VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of drm_info_once() or
> > dev_info_once(). */
> > #define DRM_DEV_INFO_ONCE(dev, fmt, ...) \
> > ({ \
> > static bool __print_once __read_mostly; \
> > @@ -379,6 +386,8 @@ void drm_dev_dbg(const struct device *dev, enum
> > drm_debug_category category,
> > /**
> > * DRM_DEV_DEBUG() - Debug output for generic drm code
> > *
> > + * NOTE: this is deprecated in favor of drm_dbg_core().
> > + *
> > * @dev: device pointer
> > * @fmt: printf() like format string.
> > */
> > @@ -387,6 +396,8 @@ void drm_dev_dbg(const struct device *dev, enum
> > drm_debug_category category,
> > /**
> > * DRM_DEV_DEBUG_DRIVER() - Debug output for vendor specific part of the
> > driver
> > *
> > + * NOTE: this is deprecated in favor of drm_dbg() or dev_dbg().
> > + *
> > * @dev: device pointer
> > * @fmt: printf() like format string.
> > */
> > @@ -395,6 +406,8 @@ void drm_dev_dbg(const struct device *dev, enum
> > drm_debug_category category,
> > /**
> > * DRM_DEV_DEBUG_KMS() - Debug output for modesetting code
> > *
> > + * NOTE: this is deprecated in favor of drm_dbg_kms().
> > + *
> > * @dev: device pointer
> > * @fmt: printf() like format string.
> > */
> > @@ -480,47 +493,63 @@ void __drm_err(const char *format, ...);
> > #define _DRM_PRINTK(once, level, fmt, ...) \
> > printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of pr_info(). */
> > #define DRM_INFO(fmt, ...) \
> > _DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__)
> > +/* NOTE: this is deprecated in favor of pr_notice(). */
> > #define DRM_NOTE(fmt, ...) \
> > _DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__)
> > +/* NOTE: this is deprecated in favor of pr_warn(). */
> > #define DRM_WARN(fmt, ...) \
> > _DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of pr_info_once(). */
> > #define DRM_INFO_ONCE(fmt,
> > ...) \
> > _DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__)
> > +/* NOTE: this is deprecated in favor of pr_notice_once(). */
> > #define DRM_NOTE_ONCE(fmt,
> > ...) \
> > _DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__)
> > +/* NOTE: this is deprecated in favor of pr_warn_once(). */
> > #define DRM_WARN_ONCE(fmt,
> > ...) \
> > _DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of pr_err(). */
> > #define DRM_ERROR(fmt, ...) \
> > __drm_err(fmt, ##__VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of pr_err_ratelimited(). */
> > #define DRM_ERROR_RATELIMITED(fmt,
> > ...) \
> > DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of drm_dbg_core(NULL, ...). */
> > #define DRM_DEBUG(fmt, ...) \
> > __drm_dbg(DRM_UT_CORE, fmt, ##__VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of drm_dbg(NULL, ...). */
> > #define DRM_DEBUG_DRIVER(fmt, ...) \
> > __drm_dbg(DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of drm_dbg_kms(NULL, ...). */
> > #define DRM_DEBUG_KMS(fmt,
> > ...) \
> > __drm_dbg(DRM_UT_KMS, fmt, ##__VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of drm_dbg_prime(NULL, ...). */
> > #define DRM_DEBUG_PRIME(fmt, ...) \
> > __drm_dbg(DRM_UT_PRIME, fmt, ##__VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of drm_dbg_atomic(NULL, ...). */
> > #define DRM_DEBUG_ATOMIC(fmt, ...) \
> > __drm_dbg(DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of drm_dbg_vbl(NULL, ...). */
> > #define DRM_DEBUG_VBL(fmt,
> > ...) \
> > __drm_dbg(DRM_UT_VBL, fmt, ##__VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of drm_dbg_lease(NULL, ...). */
> > #define DRM_DEBUG_LEASE(fmt, ...) \
> > __drm_dbg(DRM_UT_LEASE, fmt, ##__VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of drm_dbg_dp(NULL, ...). */
> > #define DRM_DEBUG_DP(fmt,
> > ...) \
> > __drm_dbg(DRM_UT_DP, fmt, ## __VA_ARGS__)
> >
> > @@ -536,6 +565,7 @@ void __drm_err(const char *format, ...);
> > #define drm_dbg_kms_ratelimited(drm, fmt, ...) \
> > __DRM_DEFINE_DBG_RATELIMITED(KMS, drm, fmt, ## __VA_ARGS__)
> >
> > +/* NOTE: this is deprecated in favor of drm_dbg_kms_ratelimited(NULL,
> > ...). */
> > #define DRM_DEBUG_KMS_RATELIMITED(fmt, ...)
> > drm_dbg_kms_ratelimited(NULL, fmt, ## __VA_ARGS__)
> >
> > /*
> >
>
> --
> Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Maxfeldstr. 5, 90409 Nürnberg, Germany
> (HRB 36809, AG Nürnberg)
> Geschäftsführer: Felix Imendörffer
--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat
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