[Intel-gfx] [PATCH 03/51] drm: add managed resources tied to drm_device

[Daniel Vetter]

On Wed, Mar 11, 2020 at 10:14:03AM +0100, Thomas Zimmermann wrote:
> 
> 
> Am 02.03.20 um 23:25 schrieb Daniel Vetter:
> <...>
> > +
> > +int __drmm_add_action(struct drm_device *dev,
> > +		      drmres_release_t action,
> > +		      void *data, const char *name)
> > +{
> > +	struct drmres *dr;
> > +	void **void_ptr;
> > +
> > +	dr = alloc_dr(action, data ? sizeof(void*) : 0,
> > +		      GFP_KERNEL | __GFP_ZERO,
> > +		      dev_to_node(dev->dev));
> > +	if (!dr) {
> > +		drm_dbg_drmres(dev, "failed to add action %s for %p\n",
> > +			       name, data);
> > +		return -ENOMEM;
> > +	}
> > +
> > +	dr->node.name = name;
> 
> Maybe do a kstrdup_const() on name and later a kfree_const() during
> release. Just in case someone decides to allocate 'name' dynamically.

Makes sense, but a bit of churn since I need a free_dr() helper now :-)
-Daniel

> 
> > +	if (data) {
> > +		void_ptr = (void **)&dr->data;
> > +		*void_ptr = data;
> > +	}
> > +
> > +	add_dr(dev, dr);
> > +
> > +	return 0;
> > +}
> > +EXPORT_SYMBOL(__drmm_add_action);
> > +
> > +void *drmm_kmalloc(struct drm_device *dev, size_t size, gfp_t gfp)
> > +{
> > +	struct drmres *dr;
> > +
> > +	dr = alloc_dr(NULL, size, gfp, dev_to_node(dev->dev));
> > +	if (!dr) {
> > +		drm_dbg_drmres(dev, "failed to allocate %zu bytes, %u flags\n",
> > +			       size, gfp);
> > +		return NULL;
> > +	}
> > +	dr->node.name = "kmalloc";
> > +
> > +	add_dr(dev, dr);
> > +
> > +	return dr->data;
> > +}
> > +EXPORT_SYMBOL(drmm_kmalloc);
> > +
> > +void drmm_kfree(struct drm_device *dev, void *data)
> > +{
> > +	struct drmres *dr_match = NULL, *dr;
> > +	unsigned long flags;
> > +
> > +	if (!data)
> > +		return;
> > +
> > +	spin_lock_irqsave(&dev->managed.lock, flags);
> > +	list_for_each_entry(dr, &dev->managed.resources, node.entry) {
> > +		if (dr->data == data) {
> > +			dr_match = dr;
> > +			del_dr(dev, dr_match);
> > +			break;
> > +		}
> > +	}
> > +	spin_unlock_irqrestore(&dev->managed.lock, flags);
> > +
> > +	if (WARN_ON(!dr_match))
> > +		return;
> > +
> > +	kfree(dr_match);
> > +}
> > +EXPORT_SYMBOL(drmm_kfree);
> > diff --git a/include/drm/drm_device.h b/include/drm/drm_device.h
> > index bb60a949f416..d39132b477dd 100644
> > --- a/include/drm/drm_device.h
> > +++ b/include/drm/drm_device.h
> > @@ -67,6 +67,21 @@ struct drm_device {
> >  	/** @dev: Device structure of bus-device */
> >  	struct device *dev;
> >  
> > +	/**
> > +	 * @managed:
> > +	 *
> > +	 * Managed resources linked to the lifetime of this &drm_device as
> > +	 * tracked by @ref.
> > +	 */
> > +	struct {
> > +		/** @managed.resources: managed resources list */
> > +		struct list_head resources;
> > +		/** @managed.final_kfree: pointer for final kfree() call */
> > +		void *final_kfree;
> > +		/** @managed.lock: protects @managed.resources */
> > +		spinlock_t lock;
> > +	} managed;
> > +
> >  	/** @driver: DRM driver managing the device */
> >  	struct drm_driver *driver;
> >  
> > diff --git a/include/drm/drm_managed.h b/include/drm/drm_managed.h
> > new file mode 100644
> > index 000000000000..7b5df7d09b19
> > --- /dev/null
> > +++ b/include/drm/drm_managed.h
> > @@ -0,0 +1,30 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +
> > +#ifndef _DRM_MANAGED_H_
> > +#define _DRM_MANAGED_H_
> > +
> > +#include <linux/gfp.h>
> > +#include <linux/types.h>
> > +
> > +struct drm_device;
> > +
> > +typedef void (*drmres_release_t)(struct drm_device *dev, void *res);
> > +
> > +#define drmm_add_action(dev, action, data) \
> > +	__drmm_add_action(dev, action, data, #action)
> > +
> > +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);
> > +
> > +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)
> > +{
> > +	return drmm_kmalloc(dev, size, gfp | __GFP_ZERO);
> > +}
> > +
> > +void drmm_kfree(struct drm_device *dev, void *data);
> > +
> > +#endif
> > diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
> > index ca7cee8e728a..1c9417430d08 100644
> > --- a/include/drm/drm_print.h
> > +++ b/include/drm/drm_print.h
> > @@ -313,6 +313,10 @@ enum drm_debug_category {
> >  	 * @DRM_UT_DP: Used in the DP code.
> >  	 */
> >  	DRM_UT_DP		= 0x100,
> > +	/**
> > +	 * @DRM_UT_DRMRES: Used in the drm managed resources code.
> > +	 */
> > +	DRM_UT_DRMRES		= 0x200,
> >  };
> >  
> >  static inline bool drm_debug_enabled(enum drm_debug_category category)
> > @@ -442,6 +446,8 @@ void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
> >  	drm_dev_dbg((drm)->dev, DRM_UT_LEASE, fmt, ##__VA_ARGS__)
> >  #define drm_dbg_dp(drm, fmt, ...)					\
> >  	drm_dev_dbg((drm)->dev, DRM_UT_DP, fmt, ##__VA_ARGS__)
> > +#define drm_dbg_drmres(drm, fmt, ...)					\
> > +	drm_dev_dbg((drm)->dev, DRM_UT_DRMRES, 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
> 




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