Re: [PATCH v8 3/8] drm/managed: Add DRM-managed alloc_ordered_workqueue

[Maxime Ripard]

On Tue, Jan 14, 2025 at 03:05:45PM +0100, Louis Chauvet wrote:
> Add drmm_alloc_ordered_workqueue(), a helper that provides managed ordered
> workqueue cleanup. The workqueue will be destroyed with the final
> reference of the DRM device.
> 
> Signed-off-by: Louis Chauvet <louis.chau...@bootlin.com>
> 
> ---
> 
> Hi Thomas,
> 
> I noted that you wanted to mark this as Reviewed, but as this was not
> the complete patch, I prefered to have a confirmation before merging the
> patch.
> 
> Thanks for your time,
> Louis Chauvet
> ---
>  drivers/gpu/drm/drm_managed.c |  8 ++++++++
>  include/drm/drm_managed.h     | 12 ++++++++++++
>  2 files changed, 20 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_managed.c b/drivers/gpu/drm/drm_managed.c
> index 
> 79ce86a5bd67a7201f5d60550a12364f2628e0ec..1589c28410f23b5a1e93dd1638420b3ae5c4b854
>  100644
> --- a/drivers/gpu/drm/drm_managed.c
> +++ b/drivers/gpu/drm/drm_managed.c
> @@ -310,3 +310,11 @@ void __drmm_mutex_release(struct drm_device *dev, void 
> *res)
>       mutex_destroy(lock);
>  }
>  EXPORT_SYMBOL(__drmm_mutex_release);
> +
> +void __drmm_destroy_workqueue(struct drm_device *device, void *res)
> +{
> +     struct workqueue_struct *wq = res;
> +
> +     destroy_workqueue(wq);
> +}
> +EXPORT_SYMBOL(__drmm_destroy_workqueue);
> diff --git a/include/drm/drm_managed.h b/include/drm/drm_managed.h
> index 
> f547b09ca0239dd7c4fb734038bae4438321395c..96d9b0e811675fe66d5d48f02b17bc7de2ac437e
>  100644
> --- a/include/drm/drm_managed.h
> +++ b/include/drm/drm_managed.h
> @@ -127,4 +127,16 @@ void __drmm_mutex_release(struct drm_device *dev, void 
> *res);
>       drmm_add_action_or_reset(dev, __drmm_mutex_release, lock);           \
>  })                                                                        \
>  
> +void __drmm_destroy_workqueue(struct drm_device *device, void *wq);
> +
> +#define drmm_alloc_ordered_workqueue(dev, fmt, flags, args...)               
>                         \
> +     ({                                                                      
>                 \
> +             struct workqueue_struct *wq = alloc_ordered_workqueue(fmt, 
> flags, ##args);      \
> +             wq ? ({                                                         
>                 \
> +                     int ret = drmm_add_action_or_reset(dev, 
> __drmm_destroy_workqueue, wq);  \
> +                     ret ? ERR_PTR(ret) : wq;                                
>                 \
> +             }) :                                                            
>                 \
> +                     wq;                                                     
>                 \
> +     })
> +
>  #endif

Is there a reason to do a macro and not a proper function?

Maxime

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