Re: [PATCH] drm: provide agp dummies for CONFIG_AGP=n

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi David,

On Wednesday 07 August 2013 15:53:15 David Herrmann wrote:
> We currently rely on gcc dead-code elimination so the drm_agp_* helpers
> are not called if drm_core_has_AGP() is false. That's ugly as hell so
> provide "static inline" dummies for the case that AGP is disabled.

Please note that we rely on -O2 in many places in the kernel through the 
IS_ENABLED() macro. If you start a crusade against this you will find way more 
work than you expect, and most probably people who will disagree with you.

This being said, I still prefer moving the explicit drm_core_has_AGP() check 
to drm_drv.c, but I'm OK with this patch.

> Fixes a build-regression introduced by:
> 
>   commit 28ec711cd427f8b61f73712a43b8100ba8ca933b
>   Author: David Herrmann <dh.herrmann@xxxxxxxxx>
>   Date:   Sat Jul 27 16:37:00 2013 +0200
> 
>       drm/agp: move AGP cleanup paths to drm_agpsupport.c
> 
> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Signed-off-by: David Herrmann <dh.herrmann@xxxxxxxxx>
> ---
> Hi guys
> 
> I test-compiled this with AGP=y and AGP=n but I don't have the resources to
> do more extensive tests. It would take forever on my intel Atom. Maybe
> someone can push this to Fenguan's build-bot?
> 
> Cheers
> David
> 
>  include/drm/drmP.h           |  49 +----------
>  include/drm/drm_agpsupport.h | 194 ++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 196 insertions(+), 47 deletions(-)
>  create mode 100644 include/drm/drm_agpsupport.h
> 
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index fba5473..3ecdde6 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -62,10 +62,8 @@
>  #endif
>  #include <asm/mman.h>
>  #include <asm/uaccess.h>
> -#if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
>  #include <linux/types.h>
>  #include <linux/agp_backend.h>
> -#endif
>  #include <linux/workqueue.h>
>  #include <linux/poll.h>
>  #include <asm/pgalloc.h>
> @@ -1226,16 +1224,6 @@ static inline int drm_dev_to_irq(struct drm_device
> *dev) return dev->driver->bus->get_irq(dev);
>  }
> 
> -
> -#if __OS_HAS_AGP
> -static inline int drm_core_has_AGP(struct drm_device *dev)
> -{
> -	return drm_core_check_feature(dev, DRIVER_USE_AGP);
> -}
> -#else
> -#define drm_core_has_AGP(dev) (0)
> -#endif
> -
>  #if __OS_HAS_MTRR
>  static inline int drm_core_has_MTRR(struct drm_device *dev)
>  {
> @@ -1292,14 +1280,6 @@ extern unsigned int drm_poll(struct file *filp,
> struct poll_table_struct *wait);
> 
>  				/* Memory management support (drm_memory.h) */
>  #include <drm/drm_memory.h>
> -extern void drm_free_agp(DRM_AGP_MEM * handle, int pages);
> -extern int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start);
> -extern DRM_AGP_MEM *drm_agp_bind_pages(struct drm_device *dev,
> -				       struct page **pages,
> -				       unsigned long num_pages,
> -				       uint32_t gtt_offset,
> -				       uint32_t type);
> -extern int drm_unbind_agp(DRM_AGP_MEM * handle);
> 
>  				/* Misc. IOCTL support (drm_ioctl.h) */
>  extern int drm_irq_by_busid(struct drm_device *dev, void *data,
> @@ -1453,33 +1433,8 @@ extern int drm_modeset_ctl(struct drm_device *dev,
> void *data, struct drm_file *file_priv);
> 
>  				/* AGP/GART support (drm_agpsupport.h) */
> -extern struct drm_agp_head *drm_agp_init(struct drm_device *dev);
> -extern void drm_agp_destroy(struct drm_agp_head *agp);
> -extern void drm_agp_clear(struct drm_device *dev);
> -extern int drm_agp_acquire(struct drm_device *dev);
> -extern int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
> -				 struct drm_file *file_priv);
> -extern int drm_agp_release(struct drm_device *dev);
> -extern int drm_agp_release_ioctl(struct drm_device *dev, void *data,
> -				 struct drm_file *file_priv);
> -extern int drm_agp_enable(struct drm_device *dev, struct drm_agp_mode
> mode); -extern int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
> -				struct drm_file *file_priv);
> -extern int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info);
> -extern int drm_agp_info_ioctl(struct drm_device *dev, void *data,
> -			struct drm_file *file_priv);
> -extern int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer
> *request); -extern int drm_agp_alloc_ioctl(struct drm_device *dev, void
> *data, -			 struct drm_file *file_priv);
> -extern int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer
> *request); -extern int drm_agp_free_ioctl(struct drm_device *dev, void
> *data, -			struct drm_file *file_priv);
> -extern int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding
> *request); -extern int drm_agp_unbind_ioctl(struct drm_device *dev, void
> *data, -			  struct drm_file *file_priv);
> -extern int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding
> *request); -extern int drm_agp_bind_ioctl(struct drm_device *dev, void
> *data, -			struct drm_file *file_priv);
> +
> +#include <drm/drm_agpsupport.h>
> 
>  				/* Stub support (drm_stub.h) */
>  extern int drm_setmaster_ioctl(struct drm_device *dev, void *data,
> diff --git a/include/drm/drm_agpsupport.h b/include/drm/drm_agpsupport.h
> new file mode 100644
> index 0000000..f926542
> --- /dev/null
> +++ b/include/drm/drm_agpsupport.h
> @@ -0,0 +1,194 @@
> +#ifndef _DRM_AGPSUPPORT_H_
> +#define _DRM_AGPSUPPORT_H_
> +
> +#include <linux/kernel.h>
> +#include <linux/mm.h>
> +#include <linux/mutex.h>
> +#include <linux/types.h>
> +#include <linux/agp_backend.h>
> +#include <drm/drmP.h>
> +
> +#ifdef __OS_HAS_AGP
> +
> +void drm_free_agp(DRM_AGP_MEM * handle, int pages);
> +int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start);
> +int drm_unbind_agp(DRM_AGP_MEM * handle);
> +DRM_AGP_MEM *drm_agp_bind_pages(struct drm_device *dev,
> +				struct page **pages,
> +				unsigned long num_pages,
> +				uint32_t gtt_offset,
> +				uint32_t type);
> +
> +struct drm_agp_head *drm_agp_init(struct drm_device *dev);
> +void drm_agp_destroy(struct drm_agp_head *agp);
> +void drm_agp_clear(struct drm_device *dev);
> +int drm_agp_acquire(struct drm_device *dev);
> +int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
> +			  struct drm_file *file_priv);
> +int drm_agp_release(struct drm_device *dev);
> +int drm_agp_release_ioctl(struct drm_device *dev, void *data,
> +			  struct drm_file *file_priv);
> +int drm_agp_enable(struct drm_device *dev, struct drm_agp_mode mode);
> +int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
> +			 struct drm_file *file_priv);
> +int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info);
> +int drm_agp_info_ioctl(struct drm_device *dev, void *data,
> +		       struct drm_file *file_priv);
> +int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request);
> +int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
> +			struct drm_file *file_priv);
> +int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request);
> +int drm_agp_free_ioctl(struct drm_device *dev, void *data,
> +		       struct drm_file *file_priv);
> +int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding
> *request); +int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
> +			 struct drm_file *file_priv);
> +int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request);
> +int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
> +		       struct drm_file *file_priv);
> +
> +static inline int drm_core_has_AGP(struct drm_device *dev)
> +{
> +	return drm_core_check_feature(dev, DRIVER_USE_AGP);
> +}
> +
> +#else /* __OS_HAS_AGP */
> +
> +static inline void drm_free_agp(DRM_AGP_MEM * handle, int pages)
> +{
> +}
> +
> +static inline int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_unbind_agp(DRM_AGP_MEM * handle)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline DRM_AGP_MEM *drm_agp_bind_pages(struct drm_device *dev,
> +					      struct page **pages,
> +					      unsigned long num_pages,
> +					      uint32_t gtt_offset,
> +					      uint32_t type)
> +{
> +	return NULL;
> +}
> +
> +static inline struct drm_agp_head *drm_agp_init(struct drm_device *dev)
> +{
> +	return NULL;
> +}
> +
> +static inline void drm_agp_destroy(struct drm_agp_head *agp)
> +{
> +}
> +
> +static inline void drm_agp_clear(struct drm_device *dev)
> +{
> +}
> +
> +static inline int drm_agp_acquire(struct drm_device *dev)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
> +					struct drm_file *file_priv)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_release(struct drm_device *dev)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_release_ioctl(struct drm_device *dev, void *data,
> +					struct drm_file *file_priv)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_enable(struct drm_device *dev,
> +				 struct drm_agp_mode mode)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
> +				       struct drm_file *file_priv)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_info(struct drm_device *dev,
> +			       struct drm_agp_info *info)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_info_ioctl(struct drm_device *dev, void *data,
> +				     struct drm_file *file_priv)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_alloc(struct drm_device *dev,
> +				struct drm_agp_buffer *request)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
> +				      struct drm_file *file_priv)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_free(struct drm_device *dev,
> +			       struct drm_agp_buffer *request)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_free_ioctl(struct drm_device *dev, void *data,
> +				     struct drm_file *file_priv)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_unbind(struct drm_device *dev,
> +				 struct drm_agp_binding *request)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
> +				       struct drm_file *file_priv)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_bind(struct drm_device *dev,
> +			       struct drm_agp_binding *request)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
> +				     struct drm_file *file_priv)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int drm_core_has_AGP(struct drm_device *dev)
> +{
> +	return 0;
> +}
> +
> +#endif /* __OS_HAS_AGP */
> +
> +#endif /* _DRM_AGPSUPPORT_H_ */
-- 
Regards,

Laurent Pinchart

_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
http://lists.freedesktop.org/mailman/listinfo/dri-devel




[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux