linux-kernel - Re: [PATCH] drm: Prune GEM vma entries

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Message-ID: <1285978196.16634.1392.camel@calx>
Date:	Fri, 01 Oct 2010 19:09:56 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>,
	Paul Rolland <rol@...917.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Dave Airlie <airlied@...hat.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] drm: Prune GEM vma entries

On Mon, 2010-09-27 at 21:08 +0100, Chris Wilson wrote:
> Hook the GEM vm open/close ops into the generic drm vm open/close so
> that the vma entries are created and destroy appropriately.
> 
> Reported-by: Matt Mackall <mpm@...enic.com>
> Cc: Dave Airlie <airlied@...hat.com>
> Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
> Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>

All signs point to this being the correct fix, but I won't have time to
test it while I'm in Japan.

Paul, does this work for you?

> ---
>  drivers/gpu/drm/drm_gem.c |    9 ++++++++-
>  drivers/gpu/drm/drm_vm.c  |   28 ++++++++++++++++++----------
>  include/drm/drmP.h        |    1 +
>  3 files changed, 27 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index bf92d07..6fe2cd2 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -528,6 +528,10 @@ void drm_gem_vm_open(struct vm_area_struct *vma)
>  	struct drm_gem_object *obj = vma->vm_private_data;
>  
>  	drm_gem_object_reference(obj);
> +
> +	mutex_lock(&obj->dev->struct_mutex);
> +	drm_vm_open_locked(vma);
> +	mutex_unlock(&obj->dev->struct_mutex);
>  }
>  EXPORT_SYMBOL(drm_gem_vm_open);
>  
> @@ -535,7 +539,10 @@ void drm_gem_vm_close(struct vm_area_struct *vma)
>  {
>  	struct drm_gem_object *obj = vma->vm_private_data;
>  
> -	drm_gem_object_unreference_unlocked(obj);
> +	mutex_lock(&obj->dev->struct_mutex);
> +	drm_vm_close_locked(vma);
> +	drm_gem_object_unreference(obj);
> +	mutex_unlock(&obj->dev->struct_mutex);
>  }
>  EXPORT_SYMBOL(drm_gem_vm_close);
>  
> diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
> index fda6746..5df4506 100644
> --- a/drivers/gpu/drm/drm_vm.c
> +++ b/drivers/gpu/drm/drm_vm.c
> @@ -433,15 +433,7 @@ static void drm_vm_open(struct vm_area_struct *vma)
>  	mutex_unlock(&dev->struct_mutex);
>  }
>  
> -/**
> - * \c close method for all virtual memory types.
> - *
> - * \param vma virtual memory area.
> - *
> - * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
> - * free it.
> - */
> -static void drm_vm_close(struct vm_area_struct *vma)
> +void drm_vm_close_locked(struct vm_area_struct *vma)
>  {
>  	struct drm_file *priv = vma->vm_file->private_data;
>  	struct drm_device *dev = priv->minor->dev;
> @@ -451,7 +443,6 @@ static void drm_vm_close(struct vm_area_struct *vma)
>  		  vma->vm_start, vma->vm_end - vma->vm_start);
>  	atomic_dec(&dev->vma_count);
>  
> -	mutex_lock(&dev->struct_mutex);
>  	list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
>  		if (pt->vma == vma) {
>  			list_del(&pt->head);
> @@ -459,6 +450,23 @@ static void drm_vm_close(struct vm_area_struct *vma)
>  			break;
>  		}
>  	}
> +}
> +
> +/**
> + * \c close method for all virtual memory types.
> + *
> + * \param vma virtual memory area.
> + *
> + * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
> + * free it.
> + */
> +static void drm_vm_close(struct vm_area_struct *vma)
> +{
> +	struct drm_file *priv = vma->vm_file->private_data;
> +	struct drm_device *dev = priv->minor->dev;
> +
> +	mutex_lock(&dev->struct_mutex);
> +	drm_vm_close_locked(vma);
>  	mutex_unlock(&dev->struct_mutex);
>  }
>  
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 7809d23..774e1d4 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -1175,6 +1175,7 @@ extern int drm_release(struct inode *inode, struct file *filp);
>  extern int drm_mmap(struct file *filp, struct vm_area_struct *vma);
>  extern int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma);
>  extern void drm_vm_open_locked(struct vm_area_struct *vma);
> +extern void drm_vm_close_locked(struct vm_area_struct *vma);
>  extern resource_size_t drm_core_get_map_ofs(struct drm_local_map * map);
>  extern resource_size_t drm_core_get_reg_ofs(struct drm_device *dev);
>  extern unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait);


-- 
Mathematics is the supreme nostalgia of our time.


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