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Date:   Thu, 27 Dec 2018 13:14:41 +0100
From:   Daniel Vetter <daniel@ffwll.ch>
To:     Sam Ravnborg <sam@ravnborg.org>
Cc:     Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        Sean Paul <sean@poorly.run>, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org,
        Alex Deucher <alexander.deucher@amd.com>,
        Christian =?iso-8859-1?Q?K=F6nig?= <christian.koenig@amd.com>,
        "David (ChunMing) Zhou" <David1.Zhou@amd.com>,
        Gerd Hoffmann <kraxel@redhat.com>,
        Rob Clark <robdclark@gmail.com>,
        Tomi Valkeinen <tomi.valkeinen@ti.com>,
        Eric Anholt <eric@anholt.net>
Subject: Re: [PATCH v1 3/7] drm: move drm_can_sleep() to drm_util.h
Message-ID: <20181227121441.GF9058@dvetter-linux.ger.corp.intel.com>
Mail-Followup-To: Sam Ravnborg <sam@ravnborg.org>,
        David Airlie <airlied@linux.ie>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        Sean Paul <sean@poorly.run>, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org,
        Alex Deucher <alexander.deucher@amd.com>,
        Christian =?iso-8859-1?Q?K=F6nig?= <christian.koenig@amd.com>,
        "David (ChunMing) Zhou" <David1.Zhou@amd.com>,
        Gerd Hoffmann <kraxel@redhat.com>, Rob Clark <robdclark@gmail.com>,
        Tomi Valkeinen <tomi.valkeinen@ti.com>,
        Eric Anholt <eric@anholt.net>
References: <20181226210215.GA27610@ravnborg.org>
 <20181226210353.13993-3-sam@ravnborg.org>
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On Wed, Dec 26, 2018 at 10:03:49PM +0100, Sam Ravnborg wrote:
> Move drm_can_sleep() out of drmP.h to allow users
> to get rid of the drmP.h include.
> 
> There was no header file that was a good match for this helper function.
> So add this to drm_util with the relevant includes.
> 
> Add include of drm_util.h to all users.
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <maxime.ripard@bootlin.com>
> Cc: Sean Paul <sean@poorly.run>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: "Christian K?nig" <christian.koenig@amd.com>
> Cc: "David (ChunMing) Zhou" <David1.Zhou@amd.com>
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Cc: Rob Clark <robdclark@gmail.com>
> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
> Cc: Eric Anholt <eric@anholt.net>
> ---
>  drivers/gpu/drm/amd/amdgpu/atom.c               |  2 ++
>  drivers/gpu/drm/ast/ast_fb.c                    |  1 +
>  drivers/gpu/drm/cirrus/cirrus_fbdev.c           |  1 +
>  drivers/gpu/drm/drm_flip_work.c                 |  1 +
>  drivers/gpu/drm/mgag200/mgag200_fb.c            |  1 +
>  drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c        |  1 +
>  drivers/gpu/drm/omapdrm/omap_fbdev.c            |  1 +
>  drivers/gpu/drm/qxl/qxl_cmd.c                   |  2 ++
>  drivers/gpu/drm/radeon/atom.c                   |  2 ++
>  drivers/gpu/drm/radeon/radeon_legacy_encoders.c |  1 +
>  drivers/gpu/drm/vc4/vc4_drv.h                   |  1 +
>  include/drm/drmP.h                              |  8 --------
>  include/drm/drm_util.h                          | 13 +++++++++++++
>  13 files changed, 27 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/atom.c b/drivers/gpu/drm/amd/amdgpu/atom.c
> index e9934de1b9cf..dd30f4e61a8c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/atom.c
> +++ b/drivers/gpu/drm/amd/amdgpu/atom.c
> @@ -27,6 +27,8 @@
>  #include <linux/slab.h>
>  #include <asm/unaligned.h>
>  
> +#include <drm/drm_util.h>
> +
>  #define ATOM_DEBUG
>  
>  #include "atom.h"
> diff --git a/drivers/gpu/drm/ast/ast_fb.c b/drivers/gpu/drm/ast/ast_fb.c
> index de26df0c6044..fb56fe848e81 100644
> --- a/drivers/gpu/drm/ast/ast_fb.c
> +++ b/drivers/gpu/drm/ast/ast_fb.c
> @@ -38,6 +38,7 @@
>  
>  #include <drm/drmP.h>
>  #include <drm/drm_crtc.h>
> +#include <drm/drm_util.h>
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_crtc_helper.h>
>  #include "ast_drv.h"
> diff --git a/drivers/gpu/drm/cirrus/cirrus_fbdev.c b/drivers/gpu/drm/cirrus/cirrus_fbdev.c
> index 68ab1821e15b..1544fa55d1ff 100644
> --- a/drivers/gpu/drm/cirrus/cirrus_fbdev.c
> +++ b/drivers/gpu/drm/cirrus/cirrus_fbdev.c
> @@ -10,6 +10,7 @@
>   */
>  #include <linux/module.h>
>  #include <drm/drmP.h>
> +#include <drm/drm_util.h>
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_crtc_helper.h>
>  
> diff --git a/drivers/gpu/drm/drm_flip_work.c b/drivers/gpu/drm/drm_flip_work.c
> index 12dea16f22a8..3da3bf5af405 100644
> --- a/drivers/gpu/drm/drm_flip_work.c
> +++ b/drivers/gpu/drm/drm_flip_work.c
> @@ -22,6 +22,7 @@
>   */
>  
>  #include <drm/drmP.h>
> +#include <drm/drm_util.h>
>  #include <drm/drm_flip_work.h>
>  
>  /**
> diff --git a/drivers/gpu/drm/mgag200/mgag200_fb.c b/drivers/gpu/drm/mgag200/mgag200_fb.c
> index 30726c9fe28c..6893934b26c0 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_fb.c
> +++ b/drivers/gpu/drm/mgag200/mgag200_fb.c
> @@ -12,6 +12,7 @@
>   */
>  #include <linux/module.h>
>  #include <drm/drmP.h>
> +#include <drm/drm_util.h>
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_crtc_helper.h>
>  
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
> index 96c2b828dba4..fa2d1d8995ee 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
> @@ -16,6 +16,7 @@
>   * this program.  If not, see <http://www.gnu.org/licenses/>.
>   */
>  
> +#include <drm/drm_util.h>
>  
>  #include "mdp5_kms.h"
>  #include "mdp5_smp.h"
> diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c b/drivers/gpu/drm/omapdrm/omap_fbdev.c
> index aee99194499f..851c59f07eb1 100644
> --- a/drivers/gpu/drm/omapdrm/omap_fbdev.c
> +++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c
> @@ -16,6 +16,7 @@
>   */
>  
>  #include <drm/drm_crtc.h>
> +#include <drm/drm_util.h>
>  #include <drm/drm_fb_helper.h>
>  
>  #include "omap_drv.h"
> diff --git a/drivers/gpu/drm/qxl/qxl_cmd.c b/drivers/gpu/drm/qxl/qxl_cmd.c
> index 208af9f37914..d17676824377 100644
> --- a/drivers/gpu/drm/qxl/qxl_cmd.c
> +++ b/drivers/gpu/drm/qxl/qxl_cmd.c
> @@ -25,6 +25,8 @@
>  
>  /* QXL cmd/ring handling */
>  
> +#include <drm/drm_util.h>
> +
>  #include "qxl_drv.h"
>  #include "qxl_object.h"
>  
> diff --git a/drivers/gpu/drm/radeon/atom.c b/drivers/gpu/drm/radeon/atom.c
> index e55cbeee7a53..ac98ad561870 100644
> --- a/drivers/gpu/drm/radeon/atom.c
> +++ b/drivers/gpu/drm/radeon/atom.c
> @@ -27,6 +27,8 @@
>  #include <linux/slab.h>
>  #include <asm/unaligned.h>
>  
> +#include <drm/drm_util.h>
> +
>  #define ATOM_DEBUG
>  
>  #include "atom.h"
> diff --git a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
> index 222a1fa41d7c..7e3257e8fd56 100644
> --- a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
> +++ b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
> @@ -24,6 +24,7 @@
>   *          Alex Deucher
>   */
>  #include <drm/drmP.h>
> +#include <drm/drm_util.h>
>  #include <drm/drm_crtc_helper.h>
>  #include <drm/radeon_drm.h>
>  #include "radeon.h"
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
> index bd6ef1f31822..79c6bcc4f509 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.h
> +++ b/drivers/gpu/drm/vc4/vc4_drv.h
> @@ -9,6 +9,7 @@
>  #include <linux/mm_types.h>
>  #include <linux/reservation.h>
>  #include <drm/drmP.h>
> +#include <drm/drm_util.h>
>  #include <drm/drm_encoder.h>
>  #include <drm/drm_gem_cma_helper.h>
>  #include <drm/drm_atomic.h>
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 2ba786820052..a77c9ee43b68 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -95,12 +95,4 @@ struct dma_buf_attachment;
>  struct pci_dev;
>  struct pci_controller;
>  
> -/* returns true if currently okay to sleep */
> -static inline bool drm_can_sleep(void)
> -{
> -	if (in_atomic() || in_dbg_master() || irqs_disabled())
> -		return false;
> -	return true;
> -}
> -
>  #endif
> diff --git a/include/drm/drm_util.h b/include/drm/drm_util.h
> index 88abdca89baa..e3200980d3f3 100644
> --- a/include/drm/drm_util.h
> +++ b/include/drm/drm_util.h
> @@ -26,7 +26,20 @@
>  #ifndef _DRM_UTIL_H_
>  #define _DRM_UTIL_H_
>  
> +#include <linux/irqflags.h>
> +#include <linux/preempt.h>
> +#include <linux/kgdb.h>
> +#include <linux/smp.h>
> +
>  /* helper for handling conditionals in various for_each macros */
>  #define for_each_if(condition) if (!(condition)) {} else
>  
> +/* returns true if currently okay to sleep */

Kerneldoc would be nice for this, specifically a huge warning that this
shouldn't be used (it doesn't work everywhere) and a FIXME that all users
should be removed. We might even want to include this as a todo item in
gpu/todo.rst
-Daniel

> +static inline bool drm_can_sleep(void)
> +{
> +	if (in_atomic() || in_dbg_master() || irqs_disabled())
> +		return false;
> +	return true;
> +}
> +
>  #endif
> -- 
> 2.12.0
> 

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