Re: [PATCH v2 3/9] drm: Add drm_connector_for_each_possible_encoder()

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Thu, Jun 28, 2018 at 06:56:40PM +0200, Daniel Vetter wrote:
> On Thu, Jun 28, 2018 at 04:13:09PM +0300, Ville Syrjala wrote:
> > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > 
> > Add a convenience macro for iterating connector->encoder_ids[].
> > Isolates the users from the implementation details.
> > 
> > Note that we don't seem to pass the file_priv down to drm_encoder_find()
> > because encoders apparently don't get leased. No idea why
> > drm_encoder_finc() even takes the file_priv actually.
> > 
> > Also use ARRAY_SIZE() when populating the array to avoid spreading
> > knowledge about the array size all over.
> > 
> > v2: Hide the drm_encoder_find() in the macro, and
> >     rename the macro appropriately (Daniel)
> > 
> > Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> > Reviewed-by: Alex Deucher <alexander.deucher@amd.com> #v1
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > ---
> >  drivers/gpu/drm/drm_connector.c    | 21 +++++++++------------
> >  drivers/gpu/drm/drm_fb_helper.c    | 11 ++---------
> >  drivers/gpu/drm/drm_probe_helper.c | 10 +++-------
> >  include/drm/drm_connector.h        | 13 +++++++++++++
> >  4 files changed, 27 insertions(+), 28 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> > index 2f9ebddd178e..186febcf4e55 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;
> > @@ -1708,22 +1708,19 @@ 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_connector_for_each_possible_encoder(connector, encoder, 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_connector_for_each_possible_encoder(connector, encoder, i) {
> > +			if (put_user(encoder->base.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 b37f06317d51..d697c1c4a067 100644
> > --- a/drivers/gpu/drm/drm_fb_helper.c
> > +++ b/drivers/gpu/drm/drm_fb_helper.c
> > @@ -2326,17 +2326,10 @@ static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
> >  static bool connector_has_possible_crtc(struct drm_connector *connector,
> >  					struct drm_crtc *crtc)
> >  {
> > +	struct drm_encoder *encoder;
> >  	int i;
> >  
> > -	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
> > -		struct drm_encoder *encoder;
> > -
> > -		if (connector->encoder_ids[i] == 0)
> > -			break;
> > -
> > -		encoder = drm_encoder_find(connector->dev, NULL,
> > -					   connector->encoder_ids[i]);
> > -
> > +	drm_connector_for_each_possible_encoder(connector, encoder, i) {
> >  		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..1a901fe9e23e 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;
> > +	struct drm_encoder *encoder;
> > +	int i;
> >  
> >  	/* Step 1: Validate against connector */
> >  	ret = drm_connector_mode_valid(connector, mode);
> > @@ -98,13 +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_connector_for_each_possible_encoder(connector, encoder, i) {
> >  		struct drm_crtc *crtc;
> >  
> > -		if (!encoder)
> > -			continue;
> > -
> >  		ret = drm_encoder_mode_valid(encoder, mode);
> >  		if (ret != MODE_OK) {
> >  			/* No point in continuing for crtc check as this encoder
> > diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> > index 14ab58ade87f..8de3a3aa516a 100644
> > --- a/include/drm/drm_connector.h
> > +++ b/include/drm/drm_connector.h
> > @@ -1193,4 +1193,17 @@ 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_connector_for_each_possible_encoder - iterate connector's possible encoders
> > + * @connector: &struct drm_connector pointer used as cursor
> > + * @encoder: the encoder
> 
> Isn't this the other way round? encoder is the cursor, connector is _the_
> connector?

Yes indeed. Copy-paste fail on my part. Will fix.

> 
> Otherwise Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> and ack from
> me on the entire series. Much prettier!
> -Daniel
> 
> > + * @__i: int iteration cursor, for macro-internal use
> > + */
> > +#define drm_connector_for_each_possible_encoder(connector, encoder, __i) \
> > +	for ((__i) = 0; (__i) < ARRAY_SIZE((connector)->encoder_ids) && \
> > +		     (connector)->encoder_ids[(__i)] != 0; (__i)++) \
> > +		for_each_if((encoder) = \
> > +			    drm_encoder_find((connector)->dev, NULL, \
> > +					     (connector)->encoder_ids[(__i)])) \
> > +
> >  #endif
> > -- 
> > 2.16.4
> > 
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

-- 
Ville Syrjälä
Intel
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