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From: Thomas Zimmermann <tzimmermann@suse.de>
To: Daniel Vetter <daniel.vetter@ffwll.ch>,
	DRI Development <dri-devel@lists.freedesktop.org>
Cc: Daniel Vetter <daniel.vetter@intel.com>,
	Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Subject: Re: [PATCH 22/51] drm: manage drm_minor cleanup with drmm_
Date: Tue, 24 Mar 2020 09:54:53 +0100	[thread overview]
Message-ID: <22b51a94-f71d-bc90-77f0-9fbf013ca996@suse.de> (raw)
In-Reply-To: <20200323144950.3018436-23-daniel.vetter@ffwll.ch>


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Hi

Am 23.03.20 um 15:49 schrieb Daniel Vetter:
> The cleanup here is somewhat tricky, since we can't tell apart the
> allocated minor index from 0. So register a cleanup action first, and
> if the index allocation fails, unregister that cleanup action again to
> avoid bad mistakes.
> 
> The kdev for the minor already handles NULL, so no problem there.
> 
> Hence add drmm_remove_action() to the drm_managed library.
> 
> v2: Make pointer math around void ** consistent with what Laurent
> suggested.
> 
> v3: Use drmm_add_action_or_reset and remove drmm_remove_action. Noticed
> because of some questions from Thomas. This also means we need to move
> the drmm_add_action_or_reset helper earlier in the series.
> 
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

This code looks easier to understand than the previous patch.

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>  drivers/gpu/drm/drm_drv.c     | 70 ++++++++++++-----------------------
>  drivers/gpu/drm/drm_managed.c | 14 +++++++
>  include/drm/drm_managed.h     |  9 ++++-
>  3 files changed, 46 insertions(+), 47 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index a710c53d13a8..25fc2107057c 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -93,13 +93,25 @@ static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
>  	}
>  }
>  
> +static void drm_minor_alloc_release(struct drm_device *dev, void *data)
> +{
> +	struct drm_minor *minor = data;
> +	unsigned long flags;
> +
> +	put_device(minor->kdev);
> +
> +	spin_lock_irqsave(&drm_minor_lock, flags);
> +	idr_remove(&drm_minors_idr, minor->index);
> +	spin_unlock_irqrestore(&drm_minor_lock, flags);
> +}
> +
>  static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
>  {
>  	struct drm_minor *minor;
>  	unsigned long flags;
>  	int r;
>  
> -	minor = kzalloc(sizeof(*minor), GFP_KERNEL);
> +	minor = drmm_kzalloc(dev, sizeof(*minor), GFP_KERNEL);
>  	if (!minor)
>  		return -ENOMEM;
>  
> @@ -117,46 +129,19 @@ static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
>  	idr_preload_end();
>  
>  	if (r < 0)
> -		goto err_free;
> +		return r;
>  
> -	minor->index = r;
> +	r = drmm_add_action_or_reset(dev, drm_minor_alloc_release, minor);
> +	if (r)
> +		return r;
>  
> +	minor->index = r;
>  	minor->kdev = drm_sysfs_minor_alloc(minor);
> -	if (IS_ERR(minor->kdev)) {
> -		r = PTR_ERR(minor->kdev);
> -		goto err_index;
> -	}
> +	if (IS_ERR(minor->kdev))
> +		return PTR_ERR(minor->kdev);
>  
>  	*drm_minor_get_slot(dev, type) = minor;
>  	return 0;
> -
> -err_index:
> -	spin_lock_irqsave(&drm_minor_lock, flags);
> -	idr_remove(&drm_minors_idr, minor->index);
> -	spin_unlock_irqrestore(&drm_minor_lock, flags);
> -err_free:
> -	kfree(minor);
> -	return r;
> -}
> -
> -static void drm_minor_free(struct drm_device *dev, unsigned int type)
> -{
> -	struct drm_minor **slot, *minor;
> -	unsigned long flags;
> -
> -	slot = drm_minor_get_slot(dev, type);
> -	minor = *slot;
> -	if (!minor)
> -		return;
> -
> -	put_device(minor->kdev);
> -
> -	spin_lock_irqsave(&drm_minor_lock, flags);
> -	idr_remove(&drm_minors_idr, minor->index);
> -	spin_unlock_irqrestore(&drm_minor_lock, flags);
> -
> -	kfree(minor);
> -	*slot = NULL;
>  }
>  
>  static int drm_minor_register(struct drm_device *dev, unsigned int type)
> @@ -678,16 +663,16 @@ int drm_dev_init(struct drm_device *dev,
>  	if (drm_core_check_feature(dev, DRIVER_RENDER)) {
>  		ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
>  		if (ret)
> -			goto err_minors;
> +			goto err;
>  	}
>  
>  	ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY);
>  	if (ret)
> -		goto err_minors;
> +		goto err;
>  
>  	ret = drm_legacy_create_map_hash(dev);
>  	if (ret)
> -		goto err_minors;
> +		goto err;
>  
>  	drm_legacy_ctxbitmap_init(dev);
>  
> @@ -695,7 +680,7 @@ int drm_dev_init(struct drm_device *dev,
>  		ret = drm_gem_init(dev);
>  		if (ret) {
>  			DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
> -			goto err_ctxbitmap;
> +			goto err;
>  		}
>  	}
>  
> @@ -708,10 +693,6 @@ int drm_dev_init(struct drm_device *dev,
>  err_setunique:
>  	if (drm_core_check_feature(dev, DRIVER_GEM))
>  		drm_gem_destroy(dev);
> -err_ctxbitmap:
> -err_minors:
> -	drm_minor_free(dev, DRM_MINOR_PRIMARY);
> -	drm_minor_free(dev, DRM_MINOR_RENDER);
>  err:
>  	drm_managed_release(dev);
>  
> @@ -776,9 +757,6 @@ void drm_dev_fini(struct drm_device *dev)
>  
>  	if (drm_core_check_feature(dev, DRIVER_GEM))
>  		drm_gem_destroy(dev);
> -
> -	drm_minor_free(dev, DRM_MINOR_PRIMARY);
> -	drm_minor_free(dev, DRM_MINOR_RENDER);
>  }
>  EXPORT_SYMBOL(drm_dev_fini);
>  
> diff --git a/drivers/gpu/drm/drm_managed.c b/drivers/gpu/drm/drm_managed.c
> index c633c2ef5269..8abf3a53aeb5 100644
> --- a/drivers/gpu/drm/drm_managed.c
> +++ b/drivers/gpu/drm/drm_managed.c
> @@ -149,6 +149,20 @@ int __drmm_add_action(struct drm_device *dev,
>  }
>  EXPORT_SYMBOL(__drmm_add_action);
>  
> +int __drmm_add_action_or_reset(struct drm_device *dev,
> +			       drmres_release_t action,
> +			       void *data, const char *name)
> +{
> +	int ret;
> +
> +	ret = __drmm_add_action(dev, action, data, name);
> +	if (ret)
> +		action(dev, data);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL(__drmm_add_action_or_reset);
> +
>  void *drmm_kmalloc(struct drm_device *dev, size_t size, gfp_t gfp)
>  {
>  	struct drmres *dr;
> diff --git a/include/drm/drm_managed.h b/include/drm/drm_managed.h
> index 89e6fce9f689..2d1e29a2200c 100644
> --- a/include/drm/drm_managed.h
> +++ b/include/drm/drm_managed.h
> @@ -17,7 +17,14 @@ int __must_check __drmm_add_action(struct drm_device *dev,
>  				   drmres_release_t action,
>  				   void *data, const char *name);
>  
> -void drmm_add_final_kfree(struct drm_device *dev, void *parent);
> +#define drmm_add_action_or_reset(dev, action, data) \
> +	__drmm_add_action_or_reset(dev, action, data, #action)
> +
> +int __must_check __drmm_add_action_or_reset(struct drm_device *dev,
> +					    drmres_release_t action,
> +					    void *data, const char *name);
> +
> +void drmm_add_final_kfree(struct drm_device *dev, void *container);
>  
>  void *drmm_kmalloc(struct drm_device *dev, size_t size, gfp_t gfp) __malloc;
>  static inline void *drmm_kzalloc(struct drm_device *dev, size_t size, gfp_t gfp)
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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  reply	other threads:[~2020-03-24  8:55 UTC|newest]

Thread overview: 78+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-23 14:48 [PATCH 00/51] drm_device managed resources, v5 Daniel Vetter
2020-03-23 14:49 ` [PATCH 01/51] mm/sl[uo]b: export __kmalloc_track(_node)_caller Daniel Vetter
2020-03-26 13:46   ` Daniel Vetter
2020-03-23 14:49 ` [PATCH 02/51] drm/i915: Don't clear drvdata in ->release Daniel Vetter
2020-03-25 18:20   ` [Intel-gfx] " Jani Nikula
2020-03-26 13:15     ` Jani Nikula
2020-03-23 14:49 ` [PATCH 03/51] drm: add managed resources tied to drm_device Daniel Vetter
2020-03-23 18:36   ` Sam Ravnborg
2020-03-24 12:45   ` [PATCH] " Daniel Vetter
2020-03-23 14:49 ` [PATCH 04/51] drm: Set final_kfree in drm_dev_alloc Daniel Vetter
2020-03-23 14:49 ` [PATCH 05/51] drm/mipi_dbi: Use drmm_add_final_kfree in all drivers Daniel Vetter
2020-03-23 14:49 ` [PATCH 06/51] drm/udl: Use drmm_add_final_kfree Daniel Vetter
2020-03-23 14:49 ` [PATCH 07/51] drm/qxl: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 08/51] drm/i915: " Daniel Vetter
2020-03-26 13:10   ` Jani Nikula
2020-03-26 13:33     ` Daniel Vetter
2020-03-23 14:49 ` [PATCH 09/51] drm/cirrus: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 10/51] drm/v3d: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 11/51] drm/tidss: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 12/51] drm/mcde: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 13/51] drm/vgem: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 14/51] drm/vkms: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 15/51] drm/repaper: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 16/51] drm/ingenic: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 17/51] drm/gm12u320: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 18/51] drm/<drivers>: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 19/51] drm: Cleanups after drmm_add_final_kfree rollout Daniel Vetter
2020-04-02  0:50   ` Laurent Pinchart
2020-04-02  5:17     ` Daniel Vetter
2020-04-02  9:39       ` Laurent Pinchart
2020-04-02  9:50         ` Daniel Vetter
2020-03-23 14:49 ` [PATCH 20/51] drm: Handle dev->unique with drmm_ Daniel Vetter
2020-03-23 14:49 ` [PATCH 21/51] drm: Use drmm_ for drm_dev_init cleanup Daniel Vetter
2020-03-24 21:20   ` Sam Ravnborg
2020-03-23 14:49 ` [PATCH 22/51] drm: manage drm_minor cleanup with drmm_ Daniel Vetter
2020-03-24  8:54   ` Thomas Zimmermann [this message]
2020-03-24 20:39   ` [PATCH] " Daniel Vetter
2020-03-24 21:42     ` Sam Ravnborg
2020-03-25  9:09       ` Daniel Vetter
2020-03-24 21:36   ` [PATCH 22/51] " Sam Ravnborg
2020-03-25  9:07     ` Daniel Vetter
2020-03-23 14:49 ` [PATCH 23/51] drm: Manage drm_gem_init " Daniel Vetter
2020-03-23 14:49 ` [PATCH 24/51] drm: Manage drm_vblank_cleanup " Daniel Vetter
2020-03-23 14:49 ` [PATCH 25/51] drm: Garbage collect drm_dev_fini Daniel Vetter
2020-03-23 14:49 ` [PATCH 26/51] drm: Manage drm_mode_config_init with drmm_ Daniel Vetter
2020-03-23 14:49 ` [PATCH 27/51] drm/bochs: Remove leftover drm_atomic_helper_shutdown Daniel Vetter
2020-03-23 14:49 ` [PATCH 28/51] drm/bochs: Drop explicit drm_mode_config_cleanup Daniel Vetter
2020-03-23 14:49 ` [PATCH 29/51] drm/cirrus: Drop explicit drm_mode_config_cleanup call Daniel Vetter
2020-03-23 14:49 ` [PATCH 30/51] drm/cirrus: Fully embrace devm_ Daniel Vetter
2020-03-23 14:49 ` [PATCH 31/51] drm/ingenic: Drop explicit drm_mode_config_cleanup call Daniel Vetter
2020-03-23 14:49 ` [PATCH 32/51] drm/mcde: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 33/51] drm/mcde: More devm_drm_dev_init Daniel Vetter
2020-03-23 14:49 ` [PATCH 34/51] drm/meson: Drop explicit drm_mode_config_cleanup call Daniel Vetter
2020-03-23 14:49 ` [PATCH 35/51] drm/pl111: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 36/51] drm/rcar-du: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 37/51] drm/rockchip: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 38/51] drm/stm: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 39/51] drm/shmob: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 40/51] drm/mtk: " Daniel Vetter
2020-03-23 15:27   ` Chun-Kuang Hu
2020-03-23 14:49 ` [PATCH 41/51] drm/tidss: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 42/51] drm/gm12u320: More drmm_ Daniel Vetter
2020-03-23 14:49 ` [PATCH 43/51] drm/gm12u320: Use devm_drm_dev_init Daniel Vetter
2020-03-23 14:49 ` [PATCH 44/51] drm/gm12u320: Use helpers for shutdown/suspend/resume Daniel Vetter
2020-03-23 14:49 ` [PATCH 45/51] drm/gm12u320: Simplify upload work Daniel Vetter
2020-03-23 14:49 ` [PATCH 46/51] drm/repaper: Drop explicit drm_mode_config_cleanup call Daniel Vetter
2020-03-23 14:49 ` [PATCH 47/51] drm/mipi-dbi: Move drm_mode_config_init into mipi library Daniel Vetter
2020-03-23 14:49 ` [PATCH 48/51] drm/mipi-dbi: Drop explicit drm_mode_config_cleanup call Daniel Vetter
2020-03-23 14:49 ` [PATCH 49/51] drm/udl: " Daniel Vetter
2020-03-24  8:56   ` Thomas Zimmermann
2020-03-23 14:49 ` [PATCH 50/51] drm/udl: drop drm_driver.release hook Daniel Vetter
2020-03-23 14:49 ` [PATCH 51/51] drm: Add docs for managed resources Daniel Vetter
2020-03-26 15:10 ` [PATCH 00/51] drm_device managed resources, v5 Daniel Vetter
  -- strict thread matches above, loose matches on Subject: below --
2020-03-02 22:25 [PATCH 00/51] drm_device managed resources, v4 Daniel Vetter
2020-03-02 22:26 ` [PATCH 22/51] drm: manage drm_minor cleanup with drmm_ Daniel Vetter
2020-03-11  9:59   ` Thomas Zimmermann
2020-03-16  9:07     ` Daniel Vetter
2020-02-27 18:14 [PATCH 00/51] drm managed resources, v3 Daniel Vetter
2020-02-27 18:14 ` [PATCH 22/51] drm: manage drm_minor cleanup with drmm_ Daniel Vetter
2020-02-21 21:02 [PATCH 00/51] drm managed resources, v2 Daniel Vetter
2020-02-21 21:02 ` [PATCH 22/51] drm: manage drm_minor cleanup with drmm_ Daniel Vetter

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