Re: [PATCH 3/8] drm: Add drm_for_each_connector_encoder_ids()

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On Wed, Jun 27, 2018 at 11:08:48AM +0200, Daniel Vetter wrote:
> On Tue, Jun 26, 2018 at 08:47:09PM +0300, Ville Syrjala wrote:
> > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > 
> > Add a convenience macro for iterating connector->encoder_ids[].
> > Isolates the users from the implementation details.
> > 
> > Also use ARRAY_SIZE() when populating the array to avoid spreading
> > knowledge about the array size all over.
> > 
> > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > ---
> >  drivers/gpu/drm/drm_connector.c    | 22 ++++++++++------------
> >  drivers/gpu/drm/drm_fb_helper.c    |  6 +++---
> >  drivers/gpu/drm/drm_probe_helper.c |  9 +++++----
> >  include/drm/drm_connector.h        | 11 +++++++++++
> >  4 files changed, 29 insertions(+), 19 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> > index 2f9ebddd178e..c43646cb8145 100644
> > --- a/drivers/gpu/drm/drm_connector.c
> > +++ b/drivers/gpu/drm/drm_connector.c
> > @@ -321,7 +321,7 @@ int drm_mode_connector_attach_encoder(struct drm_connector *connector,
> >  	if (WARN_ON(connector->encoder))
> >  		return -EINVAL;
> >  
> > -	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
> > +	for (i = 0; i < ARRAY_SIZE(connector->encoder_ids); i++) {
> >  		if (connector->encoder_ids[i] == 0) {
> >  			connector->encoder_ids[i] = encoder->base.id;
> >  			return 0;
> > @@ -1693,6 +1693,7 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
> >  	int encoders_count = 0;
> >  	int ret = 0;
> >  	int copied = 0;
> > +	u32 encoder_id;
> >  	int i;
> >  	struct drm_mode_modeinfo u_mode;
> >  	struct drm_mode_modeinfo __user *mode_ptr;
> > @@ -1708,22 +1709,19 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
> >  	if (!connector)
> >  		return -ENOENT;
> >  
> > -	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
> > -		if (connector->encoder_ids[i] != 0)
> > -			encoders_count++;
> > +	drm_for_each_connector_encoder_ids(connector, encoder_id, i)
> > +		encoders_count++;
> >  
> >  	if ((out_resp->count_encoders >= encoders_count) && encoders_count) {
> >  		copied = 0;
> >  		encoder_ptr = (uint32_t __user *)(unsigned long)(out_resp->encoders_ptr);
> > -		for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
> > -			if (connector->encoder_ids[i] != 0) {
> > -				if (put_user(connector->encoder_ids[i],
> > -					     encoder_ptr + copied)) {
> > -					ret = -EFAULT;
> > -					goto out;
> > -				}
> > -				copied++;
> > +
> > +		drm_for_each_connector_encoder_ids(connector, encoder_id, i) {
> > +			if (put_user(encoder_id, encoder_ptr + copied)) {
> > +				ret = -EFAULT;
> > +				goto out;
> >  			}
> > +			copied++;
> >  		}
> >  	}
> >  	out_resp->count_encoders = encoders_count;
> > diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> > index 61c39cd75a27..e086b08748f4 100644
> > --- a/drivers/gpu/drm/drm_fb_helper.c
> > +++ b/drivers/gpu/drm/drm_fb_helper.c
> > @@ -2326,12 +2326,12 @@ static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
> >  static bool connector_crtc_ok(struct drm_connector *connector,
> >  			      struct drm_crtc *crtc)
> >  {
> > +	u32 encoder_id;
> >  	int i;
> >  
> > -	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
> > +	drm_for_each_connector_encoder_ids(connector, encoder_id, i) {
> >  		struct drm_encoder *encoder =
> > -			drm_encoder_find(connector->dev, NULL,
> > -					 connector->encoder_ids[i]);
> > +			drm_encoder_find(connector->dev, NULL, encoder_id);
> >  
> >  		if (encoder->possible_crtcs & drm_crtc_mask(crtc))
> >  			return true;
> > diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> > index 527743394150..0239f76c52fb 100644
> > --- a/drivers/gpu/drm/drm_probe_helper.c
> > +++ b/drivers/gpu/drm/drm_probe_helper.c
> > @@ -88,9 +88,9 @@ drm_mode_validate_pipeline(struct drm_display_mode *mode,
> >  			    struct drm_connector *connector)
> >  {
> >  	struct drm_device *dev = connector->dev;
> > -	uint32_t *ids = connector->encoder_ids;
> >  	enum drm_mode_status ret = MODE_OK;
> > -	unsigned int i;
> > +	u32 encoder_id;
> > +	int i;
> >  
> >  	/* Step 1: Validate against connector */
> >  	ret = drm_connector_mode_valid(connector, mode);
> > @@ -98,8 +98,9 @@ drm_mode_validate_pipeline(struct drm_display_mode *mode,
> >  		return ret;
> >  
> >  	/* Step 2: Validate against encoders and crtcs */
> > -	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
> > -		struct drm_encoder *encoder = drm_encoder_find(dev, NULL, ids[i]);
> > +	drm_for_each_connector_encoder_ids(connector, encoder_id, i) {
> > +		struct drm_encoder *encoder =
> > +			drm_encoder_find(dev, NULL, encoder_id);
> >  		struct drm_crtc *crtc;
> >  
> >  		if (!encoder)
> > diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> > index 14ab58ade87f..4a0363f7dd8c 100644
> > --- a/include/drm/drm_connector.h
> > +++ b/include/drm/drm_connector.h
> > @@ -1193,4 +1193,15 @@ void drm_connector_list_iter_end(struct drm_connector_list_iter *iter);
> >  #define drm_for_each_connector_iter(connector, iter) \
> >  	while ((connector = drm_connector_list_iter_next(iter)))
> >  
> > +/**
> > + * drm_for_each_connector_encoder_ids - iterate connector encoder_ids[]
> 
> &drm_connector.encoder_ids would give you a (fairly direct) link. Just a
> nitpick.
> 
> Wrt the api: I think including the drm_encoder_find would be useful here -
> it's what 2/3 users want anyway, and the ioctl can easily look up the id
> again by following encoder->base.id. And then maybe call the function a
> bit differently, I think usually we go with
> $parent_object_for_each_$iterated_thing, so
> drm_connector_for_each_encoder(). There's also the
> for_each_$thing_in_$parent_object pattern (used for atomic states), but I
> think that's less fitting here.
> 
> Apologies for the interface bikeshedding ...

Looking at all the patches it's 15 places that want the drm_encoder_find
integrated vs. 4 that don't want it (without further refactoring). So even
more reasons for drm_connector_for_each_encoder imo.
-Daniel

> -Daniel
> 
> > + * @connector: &struct drm_connector pointer used as cursor
> > + * @encoder_id: the encoder ID
> > + * @__i: int iteration cursor, for macro-internal use
> > + */
> > +#define drm_for_each_connector_encoder_ids(connector, encoder_id, __i) \
> > +	for ((__i) = 0; (__i) < ARRAY_SIZE((connector)->encoder_ids) && \
> > +		     (connector)->encoder_ids[(__i)] != 0; (__i)++) \
> > +		for_each_if((encoder_id) = (connector)->encoder_ids[(__i)])
> > +
> >  #endif
> > -- 
> > 2.16.4
> > 
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

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